0.4.2

修复视频壁纸恶性bug，添加央广网组件。

LanMountainDesktop/App.axaml

@@ -19,7 +19,7 @@
     <Application.Styles>
         <sty:FluentAvaloniaTheme />
         <mi:MaterialIconStyles />
-        <StyleInclude Source="avares://LanMountainDesktop/Styles/MotionTokens.axaml" />
+        <StyleInclude Source="avares://LanMountainDesktop/Styles/FluttermotionToken.axaml" />
         <StyleInclude Source="avares://LanMountainDesktop/Styles/GlassModule.axaml" />
         <StyleInclude Source="avares://LanMountainDesktop/Styles/SettingsAnimations.axaml" />
 

LanMountainDesktop/Behaviors/PanelIntroAnimationBehavior.cs

@@ -110,7 +110,7 @@ public class PanelIntroAnimationBehavior
         var index = 0;
         var timer = new DispatcherTimer(DispatcherPriority.Background)
         {
-            Interval = UiMotionTokens.StaggerStepInterval
+            Interval = FluttermotionToken.StaggerStepInterval
         };
         timer.Tick += (_, _) =>
         {

LanMountainDesktop/Behaviors/PopupIntroAnimationBehavior.cs

@@ -10,7 +10,7 @@ namespace LanMountainDesktop.Behaviors;
 
 public class PopupIntroAnimationBehavior
 {
-    private static readonly Easing StandardEasing = Easing.Parse(UiMotionTokens.StandardBezier);
+    private static readonly Easing StandardEasing = Easing.Parse(FluttermotionToken.StandardBezier);
 
     public static readonly AttachedProperty<bool> IsEnabledProperty =
         AvaloniaProperty.RegisterAttached<PopupIntroAnimationBehavior, Control, bool>("IsEnabled");
@@ -97,14 +97,14 @@ public class PopupIntroAnimationBehavior
 
         var opacityAnimation = compositor.CreateScalarKeyFrameAnimation();
         opacityAnimation.Target = nameof(compositionVisual.Opacity);
-        opacityAnimation.Duration = UiMotionTokens.Standard;
+        opacityAnimation.Duration = FluttermotionToken.Standard;
         opacityAnimation.InsertKeyFrame(0f, 0f);
         opacityAnimation.InsertKeyFrame(1f, 1f, StandardEasing);
         compositionVisual.StartAnimation(nameof(compositionVisual.Opacity), opacityAnimation);
 
         var scaleAnimation = compositor.CreateVector3DKeyFrameAnimation();
         scaleAnimation.Target = nameof(compositionVisual.Scale);
-        scaleAnimation.Duration = UiMotionTokens.Standard;
+        scaleAnimation.Duration = FluttermotionToken.Standard;
         scaleAnimation.InsertKeyFrame(0f, compositionVisual.Scale with { X = 0.94, Y = 0.94 });
         scaleAnimation.InsertKeyFrame(1f, compositionVisual.Scale with { X = 1, Y = 1 }, StandardEasing);
         compositionVisual.StartAnimation(nameof(compositionVisual.Scale), scaleAnimation);

LanMountainDesktop/ComponentSystem/BuiltInComponentIds.cs

@@ -5,6 +5,7 @@ public static class BuiltInComponentIds
     public const string Clock = "Clock";
     public const string DesktopClock = "DesktopClock";
     public const string DesktopWeatherClock = "DesktopWeatherClock";
+    public const string DesktopWorldClock = "DesktopWorldClock";
     public const string DesktopTimer = "DesktopTimer";
     public const string DesktopWeather = "DesktopWeather";
     public const string DesktopHourlyWeather = "DesktopHourlyWeather";
@@ -28,6 +29,8 @@ public static class BuiltInComponentIds
     public const string HolidayCalendar = "HolidayCalendar";
     public const string DesktopDailyPoetry = "DesktopDailyPoetry";
     public const string DesktopDailyArtwork = "DesktopDailyArtwork";
+    public const string DesktopDailyWord = "DesktopDailyWord";
+    public const string DesktopCnrDailyNews = "DesktopCnrDailyNews";
     public const string DesktopWhiteboard = "DesktopWhiteboard";
     public const string DesktopBlackboardLandscape = "DesktopBlackboardLandscape";
     public const string DesktopBrowser = "DesktopBrowser";

LanMountainDesktop/ComponentSystem/ComponentRegistry.cs

@@ -48,6 +48,15 @@ public sealed class ComponentRegistry
                 MinHeightCells: 1,
                 AllowStatusBarPlacement: false,
                 AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopWorldClock,
+                "World Clock",
+                "Clock",
+                "Clock",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
             new DesktopComponentDefinition(
                 BuiltInComponentIds.DesktopTimer,
                 "Timer",
@@ -216,6 +225,24 @@ public sealed class ComponentRegistry
                 MinHeightCells: 2,
                 AllowStatusBarPlacement: false,
                 AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopDailyWord,
+                "Daily Word",
+                "Book",
+                "Info",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopCnrDailyNews,
+                "CNR Daily News",
+                "News",
+                "Info",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
             new DesktopComponentDefinition(
                 BuiltInComponentIds.DesktopWhiteboard,
                 "Blackboard Portrait",

LanMountainDesktop/Localization/en-US.json

@@ -12,6 +12,7 @@
     "settings.nav.status_bar":  "Status Bar",
     "settings.nav.weather":  "Weather",
     "settings.nav.region":  "Region",
+    "settings.nav.update":  "Update",
     "settings.nav.about":  "About",
     "settings.wallpaper.title":  "Wallpaper",
     "settings.wallpaper.description":  "Pick an image or video to apply as the app window wallpaper immediately.",
@@ -162,6 +163,21 @@
     "schedule.settings.delete":  "Delete",
     "schedule.settings.picker_title":  "Select ClassIsland schedule file",
     "schedule.settings.picker_file_type":  "ClassIsland CSES schedule",
+    "worldclock.settings.title":  "World Clock Settings",
+    "worldclock.settings.desc":  "Choose a time zone for each of the four clocks.",
+    "worldclock.settings.clock_1":  "Clock 1",
+    "worldclock.settings.clock_2":  "Clock 2",
+    "worldclock.settings.clock_3":  "Clock 3",
+    "worldclock.settings.clock_4":  "Clock 4",
+    "worldclock.settings.second_mode_label":  "Second Hand",
+    "worldclock.widget.today":  "Today",
+    "worldclock.widget.yesterday":  "Yesterday",
+    "worldclock.widget.tomorrow":  "Tomorrow",
+    "worldclock.widget.offset_same":  "0h",
+    "worldclock.widget.offset_ahead_hours":  "Ahead {0}h",
+    "worldclock.widget.offset_behind_hours":  "Behind {0}h",
+    "worldclock.widget.offset_ahead_hm":  "Ahead {0}h {1}m",
+    "worldclock.widget.offset_behind_hm":  "Behind {0}h {1}m",
     "weather.widget.aqi_unknown":  "AQI --",
     "weather.widget.aqi_format":  "AQI {0}",
     "weather.widget.updated_format":  "Updated {0:HH:mm}",
@@ -180,6 +196,38 @@
     "settings.region.timezone_header":  "Time Zone",
     "settings.region.timezone_desc":  "Select a time zone. Clock and calendar widgets will follow this zone.",
     "settings.region.applied_format":  "Language switched to: {0}",
+    "settings.update.title":  "Update",
+    "settings.update.current_version_label":  "Current Version",
+    "settings.update.latest_version_label":  "Latest Release",
+    "settings.update.published_at_label":  "Published At",
+    "settings.update.options_header":  "Update Options",
+    "settings.update.options_desc":  "Configure update checks and release channel.",
+    "settings.update.auto_check_toggle":  "Automatically check for updates on startup",
+    "settings.update.include_prerelease_toggle":  "Include prerelease versions",
+    "settings.update.channel_label":  "Update Channel",
+    "settings.update.channel_stable":  "Stable",
+    "settings.update.channel_preview":  "Preview",
+    "settings.update.actions_header":  "Update Actions",
+    "settings.update.actions_desc":  "Check releases, download installer, and start update.",
+    "settings.update.check_button":  "Check for Updates",
+    "settings.update.download_install_button":  "Download & Install",
+    "settings.update.download_progress_idle":  "Download progress: -",
+    "settings.update.download_progress_format":  "Download progress: {0:F0}%",
+    "settings.update.status_ready":  "Ready to check for updates.",
+    "settings.update.status_channel_changed":  "Update channel changed. Please check again.",
+    "settings.update.status_channel_changed_format":  "Update channel switched to {0}. Please check again.",
+    "settings.update.status_windows_only":  "Automatic installer update is currently available only on Windows.",
+    "settings.update.status_checking":  "Checking GitHub releases...",
+    "settings.update.status_check_failed_format":  "Update check failed: {0}",
+    "settings.update.status_up_to_date":  "You are already on the latest version.",
+    "settings.update.status_asset_missing":  "A new release is available, but no compatible installer was found.",
+    "settings.update.status_available_format":  "New version {0} is available. Click Download & Install.",
+    "settings.update.status_downloading":  "Downloading installer...",
+    "settings.update.status_download_failed_format":  "Download failed: {0}",
+    "settings.update.status_launching_installer":  "Download complete. Launching installer...",
+    "settings.update.status_installer_missing":  "Installer file was not found after download.",
+    "settings.update.status_installer_started":  "Installer started. The app will close for update.",
+    "settings.update.status_launch_failed_format":  "Failed to start installer: {0}",
     "settings.about.title":  "About",
     "settings.about.version_format":  "Version: {0}",
     "settings.about.codename_format":  "Code Name: {0}",
@@ -195,6 +243,7 @@
     "common.night":  "Night",
     "common.back":  "Back",
     "common.close":  "Close",
+    "common.unknown":  "Unknown error",
     "common.recommended":  "Recommended",
     "common.monet":  "Monet",
     "desktop.page_index_format":  "Desktop {0}",
@@ -222,6 +271,7 @@
     "component.lunar_calendar":  "Lunar Calendar",
     "component.desktop_clock":  "Clock",
     "component.weather_clock":  "Weather Clock",
+    "component.world_clock":  "World Clock",
     "component.desktop_timer":  "Timer",
     "component.desktop_weather":  "Weather",
     "component.hourly_weather":  "Hourly Weather",
@@ -232,6 +282,8 @@
     "component.audio_recorder":  "Recorder",
     "component.daily_poetry":  "Daily Poetry",
     "component.daily_artwork":  "Daily Artwork",
+    "component.daily_word":  "Daily Word",
+    "component.cnr_daily_news":  "CNR Headlines",
     "component.whiteboard":  "Blackboard (Portrait)",
     "component.blackboard_landscape":  "Blackboard (Landscape)",
     "component.browser":  "Browser",
@@ -244,6 +296,12 @@
     "component.study_score_overview":  "Study Score Overview",
     "component.study_deduction_reasons":  "Deduction Reasons",
     "component.study_interrupt_density":  "Interrupt Density",
+    "desktop_clock.settings.title":  "Clock Settings",
+    "desktop_clock.settings.desc":  "Choose the time zone for the single clock.",
+    "desktop_clock.settings.timezone_label":  "Time Zone",
+    "desktop_clock.settings.second_mode_label":  "Second Hand",
+    "clock.second_mode.tick":  "Tick",
+    "clock.second_mode.sweep":  "Sweep",
     "poetry.widget.loading_content":  "Loading poetry...",
     "poetry.widget.loading_author":  "Loading...",
     "poetry.widget.fetch_failed":  "Poetry fetch failed",
@@ -258,6 +316,24 @@
     "artwork.widget.fallback_artist":  "Recommendation service unavailable",
     "artwork.widget.fallback_year":  "Try again later",
     "artwork.widget.unknown_artist":  "Unknown artist",
+    "dailyword.widget.loading":  "Loading...",
+    "dailyword.widget.loading_word":  "daily word",
+    "dailyword.widget.loading_pronunciation":  "Fetching pronunciation...",
+    "dailyword.widget.loading_meaning":  "Fetching meaning...",
+    "dailyword.widget.loading_example":  "Fetching example sentence...",
+    "dailyword.widget.loading_example_translation":  "Loading...",
+    "dailyword.widget.fetch_failed":  "Daily word fetch failed",
+    "dailyword.widget.fallback_word":  "daily word",
+    "dailyword.widget.fallback_pronunciation":  "Pronunciation unavailable",
+    "dailyword.widget.fallback_meaning":  "Youdao dictionary is temporarily unavailable.",
+    "dailyword.widget.fallback_example":  "Tap the refresh button and try again.",
+    "dailyword.widget.fallback_example_translation":  "It will retry when network recovers.",
+    "cnrnews.widget.loading":  "Loading...",
+    "cnrnews.widget.loading_title":  "Fetching CNR headlines",
+    "cnrnews.widget.loading_subtitle":  "Please wait",
+    "cnrnews.widget.fetch_failed":  "News fetch failed",
+    "cnrnews.widget.fallback_title":  "CNR news is temporarily unavailable",
+    "cnrnews.widget.fallback_subtitle":  "Tap refresh and try again",
     "artwork.settings.title":  "Daily Artwork Settings",
     "artwork.settings.desc":  "Switch the data source used by Daily Artwork.",
     "artwork.settings.source_label":  "Mirror Source",

LanMountainDesktop/Localization/zh-CN.json

@@ -12,6 +12,7 @@
     "settings.nav.status_bar":  "状态栏",
     "settings.nav.weather":  "天气",
     "settings.nav.region":  "地区",
+    "settings.nav.update":  "更新",
     "settings.nav.about":  "关于",
     "settings.wallpaper.title":  "壁纸",
     "settings.wallpaper.description":  "选择图片或视频后可立即设为应用窗口壁纸。",
@@ -162,6 +163,21 @@
     "schedule.settings.delete":  "删除",
     "schedule.settings.picker_title":  "选择 ClassIsland 课表文件",
     "schedule.settings.picker_file_type":  "ClassIsland CSES 课表",
+    "worldclock.settings.title":  "世界时钟设置",
+    "worldclock.settings.desc":  "分别为四个时钟选择时区。",
+    "worldclock.settings.clock_1":  "时钟 1",
+    "worldclock.settings.clock_2":  "时钟 2",
+    "worldclock.settings.clock_3":  "时钟 3",
+    "worldclock.settings.clock_4":  "时钟 4",
+    "worldclock.settings.second_mode_label":  "秒针方式",
+    "worldclock.widget.today":  "今天",
+    "worldclock.widget.yesterday":  "昨天",
+    "worldclock.widget.tomorrow":  "明天",
+    "worldclock.widget.offset_same":  "0 小时",
+    "worldclock.widget.offset_ahead_hours":  "早 {0} 小时",
+    "worldclock.widget.offset_behind_hours":  "晚 {0} 小时",
+    "worldclock.widget.offset_ahead_hm":  "早 {0} 小时 {1} 分",
+    "worldclock.widget.offset_behind_hm":  "晚 {0} 小时 {1} 分",
     "weather.widget.aqi_unknown":  "AQI --",
     "weather.widget.aqi_format":  "AQI {0}",
     "weather.widget.updated_format":  "更新于 {0:HH:mm}",
@@ -180,6 +196,38 @@
     "settings.region.timezone_header":  "时区",
     "settings.region.timezone_desc":  "选择时区。时钟与日历组件会使用该时区。",
     "settings.region.applied_format":  "语言已切换为：{0}",
+    "settings.update.title":  "更新",
+    "settings.update.current_version_label":  "当前版本",
+    "settings.update.latest_version_label":  "最新发布",
+    "settings.update.published_at_label":  "发布时间",
+    "settings.update.options_header":  "更新选项",
+    "settings.update.options_desc":  "配置更新检查与发布通道。",
+    "settings.update.auto_check_toggle":  "启动时自动检查更新",
+    "settings.update.include_prerelease_toggle":  "包含预发布版本",
+    "settings.update.channel_label":  "更新通道",
+    "settings.update.channel_stable":  "正式版",
+    "settings.update.channel_preview":  "预览版",
+    "settings.update.actions_header":  "更新操作",
+    "settings.update.actions_desc":  "检查发布、下载安装包并启动更新。",
+    "settings.update.check_button":  "检查更新",
+    "settings.update.download_install_button":  "下载并安装",
+    "settings.update.download_progress_idle":  "下载进度：-",
+    "settings.update.download_progress_format":  "下载进度：{0:F0}%",
+    "settings.update.status_ready":  "可开始检查更新。",
+    "settings.update.status_channel_changed":  "更新通道已变更，请重新检查更新。",
+    "settings.update.status_channel_changed_format":  "更新通道已切换为 {0}，请重新检查更新。",
+    "settings.update.status_windows_only":  "自动安装包更新当前仅支持 Windows。",
+    "settings.update.status_checking":  "正在检查 GitHub Release...",
+    "settings.update.status_check_failed_format":  "检查更新失败：{0}",
+    "settings.update.status_up_to_date":  "当前已是最新版本。",
+    "settings.update.status_asset_missing":  "发现新版本，但未找到兼容的安装包。",
+    "settings.update.status_available_format":  "发现新版本 {0}，点击“下载并安装”继续。",
+    "settings.update.status_downloading":  "正在下载安装包...",
+    "settings.update.status_download_failed_format":  "下载失败：{0}",
+    "settings.update.status_launching_installer":  "下载完成，正在启动安装程序...",
+    "settings.update.status_installer_missing":  "下载后未找到安装包文件。",
+    "settings.update.status_installer_started":  "安装程序已启动，应用将关闭进行更新。",
+    "settings.update.status_launch_failed_format":  "启动安装程序失败：{0}",
     "settings.about.title":  "关于",
     "settings.about.version_format":  "版本号: {0}",
     "settings.about.codename_format":  "版本代号: {0}",
@@ -195,6 +243,7 @@
     "common.night":  "夜间",
     "common.back":  "返回",
     "common.close":  "关闭",
+    "common.unknown":  "未知错误",
     "common.recommended":  "推荐",
     "common.monet":  "莫奈",
     "desktop.page_index_format":  "桌面 {0}",
@@ -222,6 +271,7 @@
     "component.lunar_calendar":  "农历",
     "component.desktop_clock":  "时钟",
     "component.weather_clock":  "天气时钟",
+    "component.world_clock":  "世界时钟",
     "component.desktop_timer":  "计时器",
     "component.desktop_weather":  "天气",
     "component.hourly_weather":  "小时天气",
@@ -232,6 +282,8 @@
     "component.audio_recorder":  "录音",
     "component.daily_poetry":  "每日诗词",
     "component.daily_artwork":  "每日名画",
+    "component.daily_word":  "每日单词",
+    "component.cnr_daily_news":  "央广网头条",
     "component.whiteboard":  "竖向小黑板",
     "component.blackboard_landscape":  "横向小黑板",
     "component.browser":  "浏览器",
@@ -244,6 +296,12 @@
     "component.study_score_overview":  "自习评分总览",
     "component.study_deduction_reasons":  "扣分原因",
     "component.study_interrupt_density":  "打断密度",
+    "desktop_clock.settings.title":  "时钟设置",
+    "desktop_clock.settings.desc":  "为单时钟选择时区。",
+    "desktop_clock.settings.timezone_label":  "时区",
+    "desktop_clock.settings.second_mode_label":  "秒针方式",
+    "clock.second_mode.tick":  "跳针",
+    "clock.second_mode.sweep":  "扫针",
     "poetry.widget.loading_content":  "正在加载诗词",
     "poetry.widget.loading_author":  "加载中",
     "poetry.widget.fetch_failed":  "诗词获取失败",
@@ -258,6 +316,24 @@
     "artwork.widget.fallback_artist":  "推荐服务不可用",
     "artwork.widget.fallback_year":  "稍后重试",
     "artwork.widget.unknown_artist":  "未知作者",
+    "dailyword.widget.loading":  "加载中...",
+    "dailyword.widget.loading_word":  "每日单词",
+    "dailyword.widget.loading_pronunciation":  "正在获取发音",
+    "dailyword.widget.loading_meaning":  "正在获取释义",
+    "dailyword.widget.loading_example":  "正在获取例句",
+    "dailyword.widget.loading_example_translation":  "加载中",
+    "dailyword.widget.fetch_failed":  "每日单词获取失败",
+    "dailyword.widget.fallback_word":  "每日单词",
+    "dailyword.widget.fallback_pronunciation":  "发音暂不可用",
+    "dailyword.widget.fallback_meaning":  "有道词典暂不可用",
+    "dailyword.widget.fallback_example":  "请点击右上角刷新重试",
+    "dailyword.widget.fallback_example_translation":  "网络恢复后将自动更新",
+    "cnrnews.widget.loading":  "加载中...",
+    "cnrnews.widget.loading_title":  "正在获取新闻热点",
+    "cnrnews.widget.loading_subtitle":  "请稍候",
+    "cnrnews.widget.fetch_failed":  "新闻获取失败",
+    "cnrnews.widget.fallback_title":  "央广网新闻暂不可用",
+    "cnrnews.widget.fallback_subtitle":  "点击右上角稍后重试",
     "artwork.settings.title":  "每日图片设置",
     "artwork.settings.desc":  "切换每日图片的数据源。",
     "artwork.settings.source_label":  "镜像源",

LanMountainDesktop/Models/AppSettingsSnapshot.cs

@@ -48,6 +48,12 @@ public sealed class AppSettingsSnapshot
 
     public bool AutoStartWithWindows { get; set; }
 
+    public bool AutoCheckUpdates { get; set; } = true;
+
+    public bool IncludePrereleaseUpdates { get; set; }
+
+    public string UpdateChannel { get; set; } = string.Empty;
+
     public List<string> TopStatusComponentIds { get; set; } = [];
 
     public List<string> PinnedTaskbarActions { get; set; } =
@@ -80,6 +86,18 @@ public sealed class AppSettingsSnapshot
 
     public bool StudyEnvironmentShowDbfs { get; set; }
 
+    public string DesktopClockTimeZoneId { get; set; } = "China Standard Time";
+    public string DesktopClockSecondHandMode { get; set; } = "Tick";
+
+    public List<string> WorldClockTimeZoneIds { get; set; } =
+    [
+        "China Standard Time",
+        "GMT Standard Time",
+        "AUS Eastern Standard Time",
+        "Eastern Standard Time"
+    ];
+    public string WorldClockSecondHandMode { get; set; } = "Tick";
+
     public AppSettingsSnapshot Clone()
     {
         var clone = (AppSettingsSnapshot)MemberwiseClone();
@@ -135,6 +153,10 @@ public sealed class AppSettingsSnapshot
         }
         clone.ImportedClassSchedules = schedules;
 
+        clone.WorldClockTimeZoneIds = WorldClockTimeZoneIds is { Count: > 0 }
+            ? new List<string>(WorldClockTimeZoneIds)
+            : [];
+
         return clone;
     }
 }

LanMountainDesktop/Models/RecommendationDataModels.cs

@@ -1,4 +1,5 @@
-using System;
+using System;
+using System.Collections.Generic;
 
 namespace LanMountainDesktop.Models;
 
@@ -20,3 +21,27 @@ public sealed record DailyPoetrySnapshot(
     string? Author,
     string? Category,
     DateTimeOffset FetchedAt);
+
+public sealed record DailyNewsItemSnapshot(
+    string Title,
+    string? Summary,
+    string Url,
+    string? ImageUrl,
+    string? PublishTime);
+
+public sealed record DailyNewsSnapshot(
+    string Provider,
+    string Source,
+    IReadOnlyList<DailyNewsItemSnapshot> Items,
+    DateTimeOffset FetchedAt);
+
+public sealed record DailyWordSnapshot(
+    string Provider,
+    string Word,
+    string? UkPronunciation,
+    string? UsPronunciation,
+    string Meaning,
+    string? ExampleSentence,
+    string? ExampleTranslation,
+    string? SourceUrl,
+    DateTimeOffset FetchedAt);

LanMountainDesktop/Services/ClockSecondHandMode.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace LanMountainDesktop.Services;
+
+public static class ClockSecondHandMode
+{
+    public const string Tick = "Tick";
+    public const string Sweep = "Sweep";
+
+    public static string Normalize(string? mode)
+    {
+        return string.Equals(mode?.Trim(), Sweep, StringComparison.OrdinalIgnoreCase)
+            ? Sweep
+            : Tick;
+    }
+
+    public static bool IsSweep(string? mode)
+    {
+        return string.Equals(Normalize(mode), Sweep, StringComparison.OrdinalIgnoreCase);
+    }
+}

LanMountainDesktop/Services/GitHubReleaseUpdateService.cs

@@ -0,0 +1,482 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Runtime.InteropServices;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+public sealed record GitHubReleaseAsset(
+    string Name,
+    string BrowserDownloadUrl,
+    long SizeBytes);
+
+public sealed record GitHubReleaseInfo(
+    string TagName,
+    string Name,
+    bool IsPrerelease,
+    bool IsDraft,
+    DateTimeOffset PublishedAt,
+    IReadOnlyList<GitHubReleaseAsset> Assets);
+
+public sealed record UpdateCheckResult(
+    bool Success,
+    bool IsUpdateAvailable,
+    string CurrentVersionText,
+    string LatestVersionText,
+    GitHubReleaseInfo? Release,
+    GitHubReleaseAsset? PreferredAsset,
+    string? ErrorMessage);
+
+public sealed record UpdateDownloadResult(
+    bool Success,
+    string? FilePath,
+    string? ErrorMessage);
+
+public sealed class GitHubReleaseUpdateService : IDisposable
+{
+    private const string GithubApiVersion = "2022-11-28";
+
+    private readonly string _owner;
+    private readonly string _repo;
+    private readonly HttpClient _httpClient;
+    private readonly bool _ownsHttpClient;
+
+    public GitHubReleaseUpdateService(
+        string owner,
+        string repo,
+        HttpClient? httpClient = null)
+    {
+        _owner = owner?.Trim() ?? string.Empty;
+        _repo = repo?.Trim() ?? string.Empty;
+
+        if (httpClient is null)
+        {
+            _httpClient = new HttpClient
+            {
+                Timeout = TimeSpan.FromSeconds(20)
+            };
+            _ownsHttpClient = true;
+        }
+        else
+        {
+            _httpClient = httpClient;
+            _ownsHttpClient = false;
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.UserAgent.Any())
+        {
+            _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LanMountainDesktop-Updater/1.0");
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.Accept.Any())
+        {
+            _httpClient.DefaultRequestHeaders.Accept.ParseAdd("application/vnd.github+json");
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.Contains("X-GitHub-Api-Version"))
+        {
+            _httpClient.DefaultRequestHeaders.Add("X-GitHub-Api-Version", GithubApiVersion);
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_ownsHttpClient)
+        {
+            _httpClient.Dispose();
+        }
+    }
+
+    public async Task<UpdateCheckResult> CheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        var normalizedCurrentVersionText = NormalizeVersion(currentVersion).ToString(3);
+
+        if (string.IsNullOrWhiteSpace(_owner) || string.IsNullOrWhiteSpace(_repo))
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: "Repository information is not configured.");
+        }
+
+        try
+        {
+            var release = includePrerelease
+                ? await GetLatestReleaseIncludingPrereleaseAsync(cancellationToken)
+                : await GetLatestStableReleaseAsync(cancellationToken);
+
+            if (release is null)
+            {
+                return new UpdateCheckResult(
+                    Success: false,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: "-",
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: "No release data was returned from GitHub.");
+            }
+
+            var hasParsedTagVersion = TryParseVersion(release.TagName, out var parsedTagVersion);
+            var latestVersionText = hasParsedTagVersion && parsedTagVersion is not null
+                ? parsedTagVersion.ToString(3)
+                : release.TagName;
+
+            var isUpdateAvailable = parsedTagVersion is not null && parsedTagVersion > currentVersion;
+            var preferredAsset = isUpdateAvailable
+                ? SelectPreferredInstallerAsset(release.Assets)
+                : null;
+
+            return new UpdateCheckResult(
+                Success: true,
+                IsUpdateAvailable: isUpdateAvailable,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: latestVersionText,
+                Release: release,
+                PreferredAsset: preferredAsset,
+                ErrorMessage: null);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: ex.Message);
+        }
+    }
+
+    public async Task<UpdateDownloadResult> DownloadAssetAsync(
+        GitHubReleaseAsset asset,
+        string destinationFilePath,
+        IProgress<double>? progress = null,
+        CancellationToken cancellationToken = default)
+    {
+        if (asset is null)
+        {
+            return new UpdateDownloadResult(false, null, "Asset is null.");
+        }
+
+        if (string.IsNullOrWhiteSpace(asset.BrowserDownloadUrl))
+        {
+            return new UpdateDownloadResult(false, null, "Asset download url is empty.");
+        }
+
+        if (string.IsNullOrWhiteSpace(destinationFilePath))
+        {
+            return new UpdateDownloadResult(false, null, "Destination file path is empty.");
+        }
+
+        try
+        {
+            var directory = Path.GetDirectoryName(destinationFilePath);
+            if (!string.IsNullOrWhiteSpace(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            using var response = await _httpClient.GetAsync(
+                asset.BrowserDownloadUrl,
+                HttpCompletionOption.ResponseHeadersRead,
+                cancellationToken);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                return new UpdateDownloadResult(
+                    false,
+                    null,
+                    $"HTTP {(int)response.StatusCode}: {response.ReasonPhrase}");
+            }
+
+            var contentLength = response.Content.Headers.ContentLength ??
+                                (asset.SizeBytes > 0 ? asset.SizeBytes : -1);
+
+            await using var sourceStream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            await using var destinationStream = File.Create(destinationFilePath);
+
+            var buffer = new byte[81920];
+            long totalRead = 0;
+            int read;
+            while ((read = await sourceStream.ReadAsync(buffer, cancellationToken)) > 0)
+            {
+                await destinationStream.WriteAsync(buffer.AsMemory(0, read), cancellationToken);
+                totalRead += read;
+
+                if (contentLength > 0)
+                {
+                    progress?.Report(Math.Clamp(totalRead / (double)contentLength, 0d, 1d));
+                }
+            }
+
+            progress?.Report(1d);
+
+            return new UpdateDownloadResult(true, destinationFilePath, null);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            return new UpdateDownloadResult(false, null, ex.Message);
+        }
+    }
+
+    private async Task<GitHubReleaseInfo?> GetLatestStableReleaseAsync(CancellationToken cancellationToken)
+    {
+        var url = $"https://api.github.com/repos/{_owner}/{_repo}/releases/latest";
+        var responseText = await GetResponseTextAsync(url, cancellationToken);
+
+        using var document = JsonDocument.Parse(responseText);
+        return ParseRelease(document.RootElement);
+    }
+
+    private async Task<GitHubReleaseInfo?> GetLatestReleaseIncludingPrereleaseAsync(CancellationToken cancellationToken)
+    {
+        var url = $"https://api.github.com/repos/{_owner}/{_repo}/releases?per_page=20";
+        var responseText = await GetResponseTextAsync(url, cancellationToken);
+
+        using var document = JsonDocument.Parse(responseText);
+        if (document.RootElement.ValueKind != JsonValueKind.Array)
+        {
+            return null;
+        }
+
+        foreach (var item in document.RootElement.EnumerateArray())
+        {
+            var release = ParseRelease(item);
+            if (release is null || release.IsDraft)
+            {
+                continue;
+            }
+
+            return release;
+        }
+
+        return null;
+    }
+
+    private async Task<string> GetResponseTextAsync(string url, CancellationToken cancellationToken)
+    {
+        using var response = await _httpClient.GetAsync(url, cancellationToken);
+        var responseText = await response.Content.ReadAsStringAsync(cancellationToken);
+
+        if (!response.IsSuccessStatusCode)
+        {
+            throw new InvalidOperationException(
+                $"GitHub API request failed with HTTP {(int)response.StatusCode}: {Truncate(responseText, 180)}");
+        }
+
+        return responseText;
+    }
+
+    private static GitHubReleaseInfo? ParseRelease(JsonElement element)
+    {
+        if (element.ValueKind != JsonValueKind.Object)
+        {
+            return null;
+        }
+
+        var tagName = element.TryGetProperty("tag_name", out var tagNode)
+            ? tagNode.GetString()?.Trim()
+            : null;
+
+        if (string.IsNullOrWhiteSpace(tagName))
+        {
+            return null;
+        }
+
+        var name = element.TryGetProperty("name", out var nameNode)
+            ? nameNode.GetString()?.Trim() ?? string.Empty
+            : string.Empty;
+
+        var isPrerelease = element.TryGetProperty("prerelease", out var prereleaseNode) &&
+                           prereleaseNode.ValueKind == JsonValueKind.True;
+
+        var isDraft = element.TryGetProperty("draft", out var draftNode) &&
+                      draftNode.ValueKind == JsonValueKind.True;
+
+        var publishedAt = DateTimeOffset.MinValue;
+        if (element.TryGetProperty("published_at", out var publishedAtNode) &&
+            publishedAtNode.ValueKind == JsonValueKind.String)
+        {
+            var publishedAtText = publishedAtNode.GetString();
+            if (!string.IsNullOrWhiteSpace(publishedAtText) &&
+                DateTimeOffset.TryParse(
+                    publishedAtText,
+                    CultureInfo.InvariantCulture,
+                    DateTimeStyles.AssumeUniversal,
+                    out var parsedPublishedAt))
+            {
+                publishedAt = parsedPublishedAt;
+            }
+        }
+
+        var assets = new List<GitHubReleaseAsset>();
+        if (element.TryGetProperty("assets", out var assetsNode) && assetsNode.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var assetNode in assetsNode.EnumerateArray())
+            {
+                if (assetNode.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
+
+                var assetName = assetNode.TryGetProperty("name", out var assetNameNode)
+                    ? assetNameNode.GetString()?.Trim()
+                    : null;
+                var browserDownloadUrl = assetNode.TryGetProperty("browser_download_url", out var urlNode)
+                    ? urlNode.GetString()?.Trim()
+                    : null;
+                var sizeBytes = assetNode.TryGetProperty("size", out var sizeNode) && sizeNode.TryGetInt64(out var size)
+                    ? size
+                    : 0L;
+
+                if (string.IsNullOrWhiteSpace(assetName) || string.IsNullOrWhiteSpace(browserDownloadUrl))
+                {
+                    continue;
+                }
+
+                assets.Add(new GitHubReleaseAsset(assetName, browserDownloadUrl, sizeBytes));
+            }
+        }
+
+        return new GitHubReleaseInfo(tagName, name, isPrerelease, isDraft, publishedAt, assets);
+    }
+
+    private static GitHubReleaseAsset? SelectPreferredInstallerAsset(IReadOnlyList<GitHubReleaseAsset> assets)
+    {
+        if (assets is null || assets.Count == 0 || !OperatingSystem.IsWindows())
+        {
+            return null;
+        }
+
+        var architectureToken = RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.Arm64 => "arm64",
+            Architecture.X86 => "x86",
+            _ => "x64"
+        };
+
+        var ranked = assets
+            .Select(asset => (Asset: asset, Score: ScoreWindowsInstallerAsset(asset.Name, architectureToken)))
+            .OrderByDescending(x => x.Score)
+            .ToList();
+
+        return ranked.FirstOrDefault(x => x.Score > 0).Asset;
+    }
+
+    private static int ScoreWindowsInstallerAsset(string assetName, string architectureToken)
+    {
+        if (string.IsNullOrWhiteSpace(assetName))
+        {
+            return 0;
+        }
+
+        var score = 0;
+
+        if (assetName.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 200;
+        }
+        else if (assetName.EndsWith(".msi", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 160;
+        }
+        else
+        {
+            return 0;
+        }
+
+        if (assetName.Contains("setup", StringComparison.OrdinalIgnoreCase) ||
+            assetName.Contains("installer", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 60;
+        }
+
+        if (assetName.Contains(architectureToken, StringComparison.OrdinalIgnoreCase))
+        {
+            score += 40;
+        }
+        else if (assetName.Contains("x64", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("x86", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 30;
+        }
+
+        if (assetName.Contains("portable", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 40;
+        }
+
+        return score;
+    }
+
+    private static bool TryParseVersion(string? value, out Version? version)
+    {
+        version = null;
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return false;
+        }
+
+        var normalized = value.Trim();
+        if (normalized.StartsWith("v", StringComparison.OrdinalIgnoreCase))
+        {
+            normalized = normalized[1..];
+        }
+
+        var separatorIndex = normalized.IndexOfAny(['-', '+', ' ']);
+        if (separatorIndex > 0)
+        {
+            normalized = normalized[..separatorIndex];
+        }
+
+        if (!Version.TryParse(normalized, out var parsed))
+        {
+            return false;
+        }
+
+        version = NormalizeVersion(parsed);
+        return true;
+    }
+
+    private static Version NormalizeVersion(Version version)
+    {
+        var major = Math.Max(0, version.Major);
+        var minor = Math.Max(0, version.Minor);
+        var build = Math.Max(0, version.Build);
+        return new Version(major, minor, build);
+    }
+
+    private static string Truncate(string value, int maxLength)
+    {
+        if (string.IsNullOrEmpty(value) || value.Length <= maxLength)
+        {
+            return value;
+        }
+
+        return value[..maxLength];
+    }
+}

LanMountainDesktop/Services/IRecommendationDataService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using LanMountainDesktop.Models;
@@ -14,6 +15,14 @@ public sealed record DailyPoetryQuery(
     string? Locale = null,
     bool ForceRefresh = false);
 
+public sealed record DailyNewsQuery(
+    string? Locale = null,
+    bool ForceRefresh = false);
+
+public sealed record DailyWordQuery(
+    string? Locale = null,
+    bool ForceRefresh = false);
+
 public sealed record RecommendationQueryResult<T>(
     bool Success,
     T? Data,
@@ -46,11 +55,154 @@ public sealed record RecommendationApiOptions
 
     public string DomesticArtworkHost { get; init; } = "https://cn.bing.com";
 
+    public string CnrDailyNewsListUrl { get; init; } = "https://www.cnr.cn/newscenter/native/gd/";
+
+    public IReadOnlyList<string> CnrDailyNewsRssFeedUrls { get; init; } =
+    [
+        "https://www.cnr.cn/rss.xml",
+        "https://news.cnr.cn/rss.xml",
+        "https://www.cnr.cn/newscenter/native/gd/rss.xml",
+        "https://news.cnr.cn/native/gd/rss.xml"
+    ];
+
+    public string YoudaoDictionaryApiTemplate { get; init; } = "https://dict.youdao.com/jsonapi?q={0}";
+
+    public string YoudaoDictionaryWordPageTemplate { get; init; } = "https://dict.youdao.com/w/eng/{0}/";
+
+    public IReadOnlyList<string> YoudaoDailyWordCandidates { get; init; } =
+    [
+        "illustrate",
+        "resilient",
+        "meticulous",
+        "coherent",
+        "subtle",
+        "constrain",
+        "tangible",
+        "versatile",
+        "pragmatic",
+        "derive",
+        "intricate",
+        "notion",
+        "facilitate",
+        "sustain",
+        "clarify",
+        "convey",
+        "nuance",
+        "transform",
+        "navigate",
+        "align",
+        "elevate",
+        "refine",
+        "vivid",
+        "compile",
+        "inspect",
+        "aggregate",
+        "optimize",
+        "resonate",
+        "persist",
+        "adapt",
+        "emerge",
+        "concrete",
+        "articulate",
+        "validate",
+        "insight",
+        "concise",
+        "robust",
+        "reliable",
+        "spectrum",
+        "landscape",
+        "context",
+        "constraint",
+        "iterative",
+        "foundation",
+        "priority",
+        "workflow",
+        "synthesize",
+        "anchor",
+        "precision",
+        "momentum",
+        "integrate",
+        "observe",
+        "structure",
+        "essence",
+        "framework",
+        "drift",
+        "discern",
+        "compose",
+        "modulate",
+        "stability",
+        "trajectory",
+        "analyze",
+        "diagnose",
+        "mitigate",
+        "transparent",
+        "progressive",
+        "boundary",
+        "allocate",
+        "evaluate",
+        "reconcile",
+        "strategic",
+        "holistic",
+        "incremental",
+        "temporal",
+        "semantic",
+        "parallel",
+        "explicit",
+        "objective",
+        "capacity",
+        "durable",
+        "scalable",
+        "residual",
+        "verify",
+        "discover",
+        "curate",
+        "invoke",
+        "artistry",
+        "sincere",
+        "substantive",
+        "deliberate",
+        "dynamic",
+        "intentional",
+        "initiative",
+        "evidence",
+        "infuse",
+        "harmony",
+        "vitality",
+        "polish",
+        "portrait",
+        "rhythm",
+        "accent",
+        "gradient",
+        "palette",
+        "pattern",
+        "eclipse",
+        "horizon",
+        "luminous",
+        "serene",
+        "vantage",
+        "kinetic",
+        "refactor",
+        "calibrate",
+        "orchestrate",
+        "prototype",
+        "curiosity",
+        "discipline",
+        "inscribe",
+        "engage",
+        "spark",
+        "zenith",
+        "clarity",
+        "resolve",
+        "aptitude"
+    ];
+
     public TimeSpan CacheDuration { get; init; } = TimeSpan.FromMinutes(20);
 
     public TimeSpan RequestTimeout { get; init; } = TimeSpan.FromSeconds(8);
 
     public int DefaultArtworkCandidateCount { get; init; } = 50;
+
+    public int DefaultDailyNewsCount { get; init; } = 2;
 }
 
 public interface IRecommendationInfoService
@@ -63,5 +215,13 @@ public interface IRecommendationInfoService
         DailyPoetryQuery query,
         CancellationToken cancellationToken = default);
 
+    Task<RecommendationQueryResult<DailyNewsSnapshot>> GetDailyNewsAsync(
+        DailyNewsQuery query,
+        CancellationToken cancellationToken = default);
+
+    Task<RecommendationQueryResult<DailyWordSnapshot>> GetDailyWordAsync(
+        DailyWordQuery query,
+        CancellationToken cancellationToken = default);
+
     void ClearCache();
 }

LanMountainDesktop/Services/WorldClockTimeZoneCatalog.cs

@@ -0,0 +1,187 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace LanMountainDesktop.Services;
+
+public static class WorldClockTimeZoneCatalog
+{
+    public const int ClockCount = 4;
+
+    private static readonly string[][] DefaultTimeZoneCandidates =
+    [
+        ["China Standard Time", "Asia/Shanghai"],
+        ["GMT Standard Time", "Europe/London", "UTC"],
+        ["AUS Eastern Standard Time", "Australia/Sydney"],
+        ["Eastern Standard Time", "America/New_York"]
+    ];
+
+    private static readonly Dictionary<string, string[]> CrossPlatformAliases =
+        new(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = ["Asia/Shanghai"],
+            ["Asia/Shanghai"] = ["China Standard Time"],
+            ["GMT Standard Time"] = ["Europe/London", "UTC"],
+            ["Europe/London"] = ["GMT Standard Time", "UTC"],
+            ["AUS Eastern Standard Time"] = ["Australia/Sydney"],
+            ["Australia/Sydney"] = ["AUS Eastern Standard Time"],
+            ["Eastern Standard Time"] = ["America/New_York"],
+            ["America/New_York"] = ["Eastern Standard Time"],
+            ["UTC"] = ["Etc/UTC"],
+            ["Etc/UTC"] = ["UTC"],
+            ["Tokyo Standard Time"] = ["Asia/Tokyo"],
+            ["Asia/Tokyo"] = ["Tokyo Standard Time"]
+        };
+
+    public static IReadOnlyList<string> NormalizeTimeZoneIds(IEnumerable<string>? configuredIds)
+    {
+        var available = TimeZoneInfo.GetSystemTimeZones();
+        return NormalizeTimeZoneIds(configuredIds, available);
+    }
+
+    public static IReadOnlyList<string> NormalizeTimeZoneIds(
+        IEnumerable<string>? configuredIds,
+        IReadOnlyList<TimeZoneInfo> availableTimeZones)
+    {
+        var availableById = BuildAvailableTimeZoneLookup(availableTimeZones);
+        var requested = configuredIds?
+            .Where(id => !string.IsNullOrWhiteSpace(id))
+            .Select(id => id.Trim())
+            .ToList() ?? [];
+
+        var normalized = new List<string>(ClockCount);
+        for (var index = 0; index < ClockCount; index++)
+        {
+            var requestedId = index < requested.Count ? requested[index] : null;
+            var resolved = ResolveAvailableId(requestedId, availableById) ??
+                           ResolveDefaultId(index, availableById) ??
+                           TimeZoneInfo.Local.Id;
+            normalized.Add(resolved);
+        }
+
+        return normalized;
+    }
+
+    public static TimeZoneInfo ResolveTimeZoneOrLocal(string? timeZoneId)
+    {
+        if (TryResolveTimeZone(timeZoneId, out var resolved))
+        {
+            return resolved;
+        }
+
+        return TimeZoneInfo.Local;
+    }
+
+    private static Dictionary<string, TimeZoneInfo> BuildAvailableTimeZoneLookup(
+        IReadOnlyList<TimeZoneInfo> availableTimeZones)
+    {
+        return availableTimeZones
+            .Where(zone => !string.IsNullOrWhiteSpace(zone.Id))
+            .GroupBy(zone => zone.Id, StringComparer.OrdinalIgnoreCase)
+            .ToDictionary(group => group.Key, group => group.First(), StringComparer.OrdinalIgnoreCase);
+    }
+
+    private static string? ResolveDefaultId(
+        int slotIndex,
+        IReadOnlyDictionary<string, TimeZoneInfo> availableById)
+    {
+        var clampedIndex = Math.Clamp(slotIndex, 0, ClockCount - 1);
+        foreach (var candidateId in DefaultTimeZoneCandidates[clampedIndex])
+        {
+            var resolved = ResolveAvailableId(candidateId, availableById);
+            if (!string.IsNullOrWhiteSpace(resolved))
+            {
+                return resolved;
+            }
+        }
+
+        return null;
+    }
+
+    private static string? ResolveAvailableId(
+        string? candidateId,
+        IReadOnlyDictionary<string, TimeZoneInfo> availableById)
+    {
+        if (string.IsNullOrWhiteSpace(candidateId))
+        {
+            return null;
+        }
+
+        var normalizedCandidate = candidateId.Trim();
+        if (availableById.TryGetValue(normalizedCandidate, out var exact))
+        {
+            return exact.Id;
+        }
+
+        if (TryResolveTimeZone(normalizedCandidate, out var resolvedZone) &&
+            availableById.TryGetValue(resolvedZone.Id, out var resolved))
+        {
+            return resolved.Id;
+        }
+
+        if (!CrossPlatformAliases.TryGetValue(normalizedCandidate, out var aliases))
+        {
+            return null;
+        }
+
+        foreach (var alias in aliases)
+        {
+            if (availableById.TryGetValue(alias, out var aliasZone))
+            {
+                return aliasZone.Id;
+            }
+
+            if (TryResolveTimeZone(alias, out var aliasResolvedZone) &&
+                availableById.TryGetValue(aliasResolvedZone.Id, out var mappedAlias))
+            {
+                return mappedAlias.Id;
+            }
+        }
+
+        return null;
+    }
+
+    private static bool TryResolveTimeZone(string? timeZoneId, out TimeZoneInfo timeZone)
+    {
+        timeZone = TimeZoneInfo.Local;
+        if (string.IsNullOrWhiteSpace(timeZoneId))
+        {
+            return false;
+        }
+
+        var normalizedId = timeZoneId.Trim();
+        if (TryFindTimeZone(normalizedId, out timeZone))
+        {
+            return true;
+        }
+
+        if (!CrossPlatformAliases.TryGetValue(normalizedId, out var aliases))
+        {
+            return false;
+        }
+
+        foreach (var alias in aliases)
+        {
+            if (TryFindTimeZone(alias, out timeZone))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static bool TryFindTimeZone(string timeZoneId, out TimeZoneInfo timeZone)
+    {
+        timeZone = TimeZoneInfo.Local;
+        try
+        {
+            timeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId);
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+}

LanMountainDesktop/Styles/FluttermotionToken.axaml

@@ -0,0 +1,12 @@
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Styles.Resources>
+        <x:TimeSpan x:Key="FluttermotionToken.Duration.Fast">0:0:0.12</x:TimeSpan>
+        <x:TimeSpan x:Key="FluttermotionToken.Duration.Standard">0:0:0.16</x:TimeSpan>
+        <x:TimeSpan x:Key="FluttermotionToken.Duration.Slow">0:0:0.20</x:TimeSpan>
+        <x:TimeSpan x:Key="FluttermotionToken.Duration.Page">0:0:0.24</x:TimeSpan>
+        <x:TimeSpan x:Key="FluttermotionToken.Duration.Intro">0:0:0.32</x:TimeSpan>
+
+        <x:Double x:Key="FluttermotionToken.BackdropBlurRadiusStrong">30</x:Double>
+    </Styles.Resources>
+</Styles>

LanMountainDesktop/Styles/GlassModule.axaml

@@ -25,9 +25,9 @@
         <Setter Property="Padding" Value="16,10" />
         <Setter Property="Transitions">
             <Transitions>
-                <TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.12" />
-                <DoubleTransition Property="Opacity" Duration="0:0:0.12" />
-                <BrushTransition Property="Background" Duration="0:0:0.12" />
+                <TransformOperationsTransition Property="RenderTransform" Duration="{StaticResource FluttermotionToken.Duration.Fast}" />
+                <DoubleTransition Property="Opacity" Duration="{StaticResource FluttermotionToken.Duration.Fast}" />
+                <BrushTransition Property="Background" Duration="{StaticResource FluttermotionToken.Duration.Fast}" />
             </Transitions>
         </Setter>
     </Style>
@@ -150,7 +150,7 @@
         <Setter Property="BoxShadow" Value="0 12 32 #33000000" />
         <Setter Property="Transitions">
             <Transitions>
-                <ThicknessTransition Property="Padding" Duration="0:0:0.2" Easing="QuarticEaseOut" />
+                <ThicknessTransition Property="Padding" Duration="{StaticResource FluttermotionToken.Duration.Slow}" Easing="QuarticEaseOut" />
             </Transitions>
         </Setter>
     </Style>

LanMountainDesktop/Styles/MotionTokens.axaml

@@ -1,14 +0,0 @@
-<Styles xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <Styles.Resources>
-        <x:String x:Key="MotionEasingStandard">0.22,1,0.36,1</x:String>
-
-        <x:String x:Key="MotionDurationFast">0:0:0.12</x:String>
-        <x:String x:Key="MotionDurationStandard">0:0:0.16</x:String>
-        <x:String x:Key="MotionDurationSlow">0:0:0.20</x:String>
-        <x:String x:Key="MotionDurationPage">0:0:0.24</x:String>
-        <x:String x:Key="MotionDurationIntro">0:0:0.32</x:String>
-
-        <x:Double x:Key="MotionBackdropBlurRadiusStrong">30</x:Double>
-    </Styles.Resources>
-</Styles>

LanMountainDesktop/Styles/SettingsAnimations.axaml

@@ -21,7 +21,7 @@
             </Setter>
             <Style Selector="^[(behaviors|PanelIntroAnimationBehavior.IsAnimationPlayed)=True]">
                 <Style.Animations>
-                    <Animation Duration="0:0:0.32"
+                    <Animation Duration="{StaticResource FluttermotionToken.Duration.Intro}"
                                FillMode="Both"
                                Easing="0.22,1,0.36,1">
                         <KeyFrame Cue="0%">
@@ -53,9 +53,9 @@
         <Setter Property="MinHeight" Value="34" />
         <Setter Property="Transitions">
             <Transitions>
-                <BrushTransition Property="Background" Duration="0:0:0.16" Easing="0.22,1,0.36,1" />
-                <BrushTransition Property="BorderBrush" Duration="0:0:0.16" Easing="0.22,1,0.36,1" />
-                <TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.16" Easing="0.22,1,0.36,1" />
+                <BrushTransition Property="Background" Duration="{StaticResource FluttermotionToken.Duration.Standard}" Easing="0.22,1,0.36,1" />
+                <BrushTransition Property="BorderBrush" Duration="{StaticResource FluttermotionToken.Duration.Standard}" Easing="0.22,1,0.36,1" />
+                <TransformOperationsTransition Property="RenderTransform" Duration="{StaticResource FluttermotionToken.Duration.Standard}" Easing="0.22,1,0.36,1" />
             </Transitions>
         </Setter>
     </Style>
@@ -74,8 +74,8 @@
     <Style Selector="Grid.settings-scope ComboBox">
         <Setter Property="Transitions">
             <Transitions>
-                <BrushTransition Property="Background" Duration="0:0:0.12" Easing="0.22,1,0.36,1" />
-                <TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.12" Easing="0.22,1,0.36,1" />
+                <BrushTransition Property="Background" Duration="{StaticResource FluttermotionToken.Duration.Fast}" Easing="0.22,1,0.36,1" />
+                <TransformOperationsTransition Property="RenderTransform" Duration="{StaticResource FluttermotionToken.Duration.Fast}" Easing="0.22,1,0.36,1" />
             </Transitions>
         </Setter>
     </Style>
@@ -87,8 +87,8 @@
     <Style Selector="Grid.settings-scope ToggleSwitch">
         <Setter Property="Transitions">
             <Transitions>
-                <DoubleTransition Property="Opacity" Duration="0:0:0.16" Easing="0.22,1,0.36,1" />
-                <TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.16" Easing="0.22,1,0.36,1" />
+                <DoubleTransition Property="Opacity" Duration="{StaticResource FluttermotionToken.Duration.Standard}" Easing="0.22,1,0.36,1" />
+                <TransformOperationsTransition Property="RenderTransform" Duration="{StaticResource FluttermotionToken.Duration.Standard}" Easing="0.22,1,0.36,1" />
             </Transitions>
         </Setter>
     </Style>

LanMountainDesktop/Theme/FluttermotionToken.cs

@@ -2,7 +2,7 @@ using System;
 
 namespace LanMountainDesktop.Theme;
 
-public static class UiMotionTokens
+public static class FluttermotionToken
 {
     public static readonly TimeSpan Fast = TimeSpan.FromMilliseconds(120);
     public static readonly TimeSpan Standard = TimeSpan.FromMilliseconds(160);

LanMountainDesktop/Views/Components/AnalogClockWidget.axaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Globalization;
+using System.Collections.Generic;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Shapes;
@@ -12,6 +13,40 @@ namespace LanMountainDesktop.Views.Components;
 
 public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, ITimeZoneAwareComponentWidget
 {
+    private static readonly IReadOnlyDictionary<string, string> ZhCityNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "\u5317\u4EAC",
+            ["Asia/Shanghai"] = "\u5317\u4EAC",
+            ["GMT Standard Time"] = "\u4F26\u6566",
+            ["Europe/London"] = "\u4F26\u6566",
+            ["AUS Eastern Standard Time"] = "\u6089\u5C3C",
+            ["Australia/Sydney"] = "\u6089\u5C3C",
+            ["Eastern Standard Time"] = "\u7EBD\u7EA6",
+            ["America/New_York"] = "\u7EBD\u7EA6",
+            ["Tokyo Standard Time"] = "\u4E1C\u4EAC",
+            ["Asia/Tokyo"] = "\u4E1C\u4EAC",
+            ["UTC"] = "\u534F\u8C03\u4E16\u754C\u65F6",
+            ["Etc/UTC"] = "\u534F\u8C03\u4E16\u754C\u65F6"
+        };
+
+    private static readonly IReadOnlyDictionary<string, string> EnCityNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "Beijing",
+            ["Asia/Shanghai"] = "Beijing",
+            ["GMT Standard Time"] = "London",
+            ["Europe/London"] = "London",
+            ["AUS Eastern Standard Time"] = "Sydney",
+            ["Australia/Sydney"] = "Sydney",
+            ["Eastern Standard Time"] = "New York",
+            ["America/New_York"] = "New York",
+            ["Tokyo Standard Time"] = "Tokyo",
+            ["Asia/Tokyo"] = "Tokyo",
+            ["UTC"] = "UTC",
+            ["Etc/UTC"] = "UTC"
+        };
+
     private readonly DispatcherTimer _timer = new()
     {
         Interval = TimeSpan.FromSeconds(1)
@@ -20,11 +55,16 @@ public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, I
     private const double DialSize = 258;
     private const double Center = DialSize / 2;
 
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
     private TimeZoneService? _timeZoneService;
     private double _currentCellSize = 48;
     private bool _dialInitialized;
     private bool _handsInitialized;
     private bool? _isNightModeApplied;
+    private TimeZoneInfo _clockTimeZone = WorldClockTimeZoneCatalog.ResolveTimeZoneOrLocal("China Standard Time");
+    private string _languageCode = "zh-CN";
+    private string _secondHandMode = ClockSecondHandMode.Tick;
     private readonly Line _hourHandLine = CreateHandLine("#1A2A46", 12);
     private readonly Line _minuteHandLine = CreateHandLine("#29406B", 8);
     private readonly Line _secondHandLine = CreateHandLine("#1A74F2", 4);
@@ -40,6 +80,8 @@ public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, I
 
         InitializeDialIfNeeded();
         InitializeHandsIfNeeded();
+        LoadClockSettings();
+        ApplySecondHandTimerInterval();
         UpdateClock();
     }
 
@@ -62,10 +104,19 @@ public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, I
         _timeZoneService = null;
     }
 
+    public void RefreshFromSettings()
+    {
+        LoadClockSettings();
+        ApplySecondHandTimerInterval();
+        UpdateClock();
+    }
+
     private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
     {
         InitializeDialIfNeeded();
         InitializeHandsIfNeeded();
+        LoadClockSettings();
+        ApplySecondHandTimerInterval();
         UpdateClock();
         _timer.Start();
     }
@@ -187,17 +238,22 @@ public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, I
     {
         ApplyModeVisualIfNeeded();
 
-        var now = _timeZoneService?.GetCurrentTime() ?? DateTime.Now;
-        var hourAngle = (now.Hour % 12 + now.Minute / 60d + now.Second / 3600d) * 30d;
-        var minuteAngle = (now.Minute + now.Second / 60d) * 6d;
-        var secondAngle = (now.Second + now.Millisecond / 1000d) * 6d;
+        var now = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, _clockTimeZone);
+        var secondValue = ClockSecondHandMode.IsSweep(_secondHandMode)
+            ? now.Second + now.Millisecond / 1000d
+            : now.Second;
+        var minuteValue = now.Minute + secondValue / 60d;
+        var hourValue = (now.Hour % 12) + minuteValue / 60d;
+
+        var hourAngle = hourValue * 30d;
+        var minuteAngle = minuteValue * 6d;
+        var secondAngle = secondValue * 6d;
 
         SetHandGeometry(_hourHandLine, hourAngle, forwardLength: 52, backwardLength: 6);
         SetHandGeometry(_minuteHandLine, minuteAngle, forwardLength: 76, backwardLength: 8);
         SetHandGeometry(_secondHandLine, secondAngle, forwardLength: 94, backwardLength: 18);
 
-        var isZh = CultureInfo.CurrentCulture.TwoLetterISOLanguageName.Equals("zh", StringComparison.OrdinalIgnoreCase);
-        CityTextBlock.Text = isZh ? "\u5317\u4eac" : "Beijing";
+        CityTextBlock.Text = ResolveCityName(_clockTimeZone);
     }
 
     private void ApplyModeVisualIfNeeded()
@@ -299,6 +355,53 @@ public partial class AnalogClockWidget : UserControl, IDesktopComponentWidget, I
         };
     }
 
+    private void LoadClockSettings()
+    {
+        var snapshot = _settingsService.Load();
+        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+
+        var configuredTimeZoneId = string.IsNullOrWhiteSpace(snapshot.DesktopClockTimeZoneId)
+            ? "China Standard Time"
+            : snapshot.DesktopClockTimeZoneId.Trim();
+
+        _clockTimeZone = WorldClockTimeZoneCatalog.ResolveTimeZoneOrLocal(configuredTimeZoneId);
+        _secondHandMode = ClockSecondHandMode.Normalize(snapshot.DesktopClockSecondHandMode);
+    }
+
+    private void ApplySecondHandTimerInterval()
+    {
+        _timer.Interval = ClockSecondHandMode.IsSweep(_secondHandMode)
+            ? TimeSpan.FromMilliseconds(16)
+            : TimeSpan.FromSeconds(1);
+    }
+
+    private string ResolveCityName(TimeZoneInfo timeZone)
+    {
+        var cityNames = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase)
+            ? ZhCityNames
+            : EnCityNames;
+        if (cityNames.TryGetValue(timeZone.Id, out var cityName))
+        {
+            return cityName;
+        }
+
+        var normalized = timeZone.Id;
+        var slashIndex = normalized.LastIndexOf('/');
+        if (slashIndex >= 0 && slashIndex < normalized.Length - 1)
+        {
+            normalized = normalized[(slashIndex + 1)..];
+        }
+
+        normalized = normalized.Replace('_', ' ').Trim();
+        normalized = normalized
+            .Replace("Standard Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Replace("Daylight Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Replace("Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Trim();
+
+        return string.IsNullOrWhiteSpace(normalized) ? timeZone.Id : normalized;
+    }
+
     private bool ResolveIsNightMode()
     {
         if (ActualThemeVariant == ThemeVariant.Dark)

LanMountainDesktop/Views/Components/AnalogClockWidgetSettingsWindow.axaml

@@ -0,0 +1,73 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="560"
+             d:DesignHeight="300"
+             x:Class="LanMountainDesktop.Views.Components.AnalogClockWidgetSettingsWindow">
+    <Border Background="{DynamicResource AdaptiveBackgroundBrush}"
+            Padding="16">
+        <Grid RowDefinitions="Auto,Auto,*"
+              RowSpacing="10">
+            <TextBlock x:Name="TitleTextBlock"
+                       Text="时钟设置"
+                       FontSize="18"
+                       FontWeight="SemiBold"
+                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+            <TextBlock x:Name="DescriptionTextBlock"
+                       Grid.Row="1"
+                       Text="为单时钟选择时区。"
+                       FontSize="12"
+                       TextWrapping="Wrap"
+                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+
+            <ScrollViewer Grid.Row="2"
+                          HorizontalScrollBarVisibility="Disabled"
+                          VerticalScrollBarVisibility="Auto">
+                <StackPanel Spacing="10"
+                            Margin="0,0,6,0">
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="TimeZoneLabelTextBlock"
+                                       Text="时区"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="TimeZoneComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnTimeZoneSelectionChanged" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="SecondHandModeLabelTextBlock"
+                                       Text="秒针方式"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <StackPanel Orientation="Horizontal"
+                                        Spacing="12">
+                                <RadioButton x:Name="SecondHandTickRadioButton"
+                                             GroupName="desktop_clock_second_mode"
+                                             Content="跳针"
+                                             Checked="OnSecondHandModeChanged" />
+                                <RadioButton x:Name="SecondHandSweepRadioButton"
+                                             GroupName="desktop_clock_second_mode"
+                                             Content="扫针"
+                                             Checked="OnSecondHandModeChanged" />
+                            </StackPanel>
+                        </StackPanel>
+                    </Border>
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/AnalogClockWidgetSettingsWindow.axaml.cs

@@ -0,0 +1,206 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Interactivity;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class AnalogClockWidgetSettingsWindow : UserControl
+{
+    private static readonly IReadOnlyDictionary<string, string> ZhTimeZoneNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "中国标准时间",
+            ["Asia/Shanghai"] = "中国标准时间",
+            ["GMT Standard Time"] = "格林威治标准时间",
+            ["Europe/London"] = "格林威治标准时间",
+            ["AUS Eastern Standard Time"] = "澳大利亚东部标准时间",
+            ["Australia/Sydney"] = "澳大利亚东部标准时间",
+            ["Eastern Standard Time"] = "美国东部标准时间",
+            ["America/New_York"] = "美国东部标准时间",
+            ["Tokyo Standard Time"] = "日本标准时间",
+            ["Asia/Tokyo"] = "日本标准时间",
+            ["UTC"] = "协调世界时",
+            ["Etc/UTC"] = "协调世界时"
+        };
+
+    private readonly AppSettingsService _appSettingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly TimeZoneService _timeZoneService = new();
+    private bool _suppressEvents;
+    private string _languageCode = "zh-CN";
+    private IReadOnlyList<TimeZoneInfo> _allTimeZones = Array.Empty<TimeZoneInfo>();
+    private string _selectedTimeZoneId = string.Empty;
+    private string _secondHandMode = ClockSecondHandMode.Tick;
+
+    public event EventHandler? SettingsChanged;
+
+    public AnalogClockWidgetSettingsWindow()
+    {
+        InitializeComponent();
+        LoadState();
+        ApplyLocalization();
+        PopulateTimeZoneComboBox();
+    }
+
+    private void LoadState()
+    {
+        var snapshot = _appSettingsService.Load();
+        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        _selectedTimeZoneId = string.IsNullOrWhiteSpace(snapshot.DesktopClockTimeZoneId)
+            ? "China Standard Time"
+            : snapshot.DesktopClockTimeZoneId.Trim();
+        _secondHandMode = ClockSecondHandMode.Normalize(snapshot.DesktopClockSecondHandMode);
+
+        _allTimeZones = _timeZoneService
+            .GetAllTimeZones()
+            .OrderBy(zone => zone.GetUtcOffset(DateTime.UtcNow))
+            .ThenBy(zone => zone.DisplayName, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    private void ApplyLocalization()
+    {
+        TitleTextBlock.Text = L("desktop_clock.settings.title", "时钟设置");
+        DescriptionTextBlock.Text = L("desktop_clock.settings.desc", "为单时钟选择时区。");
+        TimeZoneLabelTextBlock.Text = L("desktop_clock.settings.timezone_label", "时区");
+        SecondHandModeLabelTextBlock.Text = L("desktop_clock.settings.second_mode_label", "秒针方式");
+        SecondHandTickRadioButton.Content = L("clock.second_mode.tick", "跳针");
+        SecondHandSweepRadioButton.Content = L("clock.second_mode.sweep", "扫针");
+    }
+
+    private void PopulateTimeZoneComboBox()
+    {
+        _suppressEvents = true;
+        try
+        {
+            TimeZoneComboBox.Items.Clear();
+            foreach (var timeZone in _allTimeZones)
+            {
+                TimeZoneComboBox.Items.Add(new ComboBoxItem
+                {
+                    Tag = timeZone.Id,
+                    Content = GetLocalizedTimeZoneDisplayName(timeZone)
+                });
+            }
+
+            var normalizedId = WorldClockTimeZoneCatalog.NormalizeTimeZoneIds(
+                new[] { _selectedTimeZoneId },
+                _allTimeZones)[0];
+            _selectedTimeZoneId = normalizedId;
+
+            var selected = TimeZoneComboBox.Items
+                .OfType<ComboBoxItem>()
+                .FirstOrDefault(item => string.Equals(item.Tag as string, normalizedId, StringComparison.OrdinalIgnoreCase));
+
+            TimeZoneComboBox.SelectedItem = selected ?? TimeZoneComboBox.Items.OfType<ComboBoxItem>().FirstOrDefault();
+
+            var normalizedMode = ClockSecondHandMode.Normalize(_secondHandMode);
+            SecondHandTickRadioButton.IsChecked = string.Equals(
+                normalizedMode,
+                ClockSecondHandMode.Tick,
+                StringComparison.OrdinalIgnoreCase);
+            SecondHandSweepRadioButton.IsChecked = string.Equals(
+                normalizedMode,
+                ClockSecondHandMode.Sweep,
+                StringComparison.OrdinalIgnoreCase);
+        }
+        finally
+        {
+            _suppressEvents = false;
+        }
+    }
+
+    private void OnTimeZoneSelectionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        SaveState();
+    }
+
+    private void OnSecondHandModeChanged(object? sender, RoutedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        SaveState();
+    }
+
+    private void SaveState()
+    {
+        var selectedId = (TimeZoneComboBox.SelectedItem as ComboBoxItem)?.Tag as string;
+        var normalizedId = WorldClockTimeZoneCatalog.NormalizeTimeZoneIds(
+            new[] { selectedId ?? _selectedTimeZoneId },
+            _allTimeZones)[0];
+        _selectedTimeZoneId = normalizedId;
+        _secondHandMode = GetSelectedSecondHandMode();
+
+        var snapshot = _appSettingsService.Load();
+        snapshot.DesktopClockTimeZoneId = normalizedId;
+        snapshot.DesktopClockSecondHandMode = _secondHandMode;
+        _appSettingsService.Save(snapshot);
+
+        SettingsChanged?.Invoke(this, EventArgs.Empty);
+    }
+
+    private string GetSelectedSecondHandMode()
+    {
+        return SecondHandSweepRadioButton.IsChecked == true
+            ? ClockSecondHandMode.Sweep
+            : ClockSecondHandMode.Tick;
+    }
+
+    private string GetLocalizedTimeZoneDisplayName(TimeZoneInfo timeZone)
+    {
+        var offset = timeZone.GetUtcOffset(DateTime.UtcNow);
+        var sign = offset >= TimeSpan.Zero ? "+" : "-";
+        var totalMinutes = Math.Abs((int)offset.TotalMinutes);
+        var hours = totalMinutes / 60;
+        var minutes = totalMinutes % 60;
+
+        var displayName = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase)
+            ? ResolveZhDisplayName(timeZone)
+            : ResolveEnDisplayName(timeZone);
+
+        return $"(UTC{sign}{hours:D2}:{minutes:D2}) {displayName}";
+    }
+
+    private static string ResolveZhDisplayName(TimeZoneInfo timeZone)
+    {
+        if (ZhTimeZoneNames.TryGetValue(timeZone.Id, out var localizedName))
+        {
+            return localizedName;
+        }
+
+        return string.IsNullOrWhiteSpace(timeZone.StandardName)
+            ? timeZone.DisplayName
+            : timeZone.StandardName;
+    }
+
+    private static string ResolveEnDisplayName(TimeZoneInfo timeZone)
+    {
+        if (!string.IsNullOrWhiteSpace(timeZone.StandardName))
+        {
+            return timeZone.StandardName;
+        }
+
+        return timeZone.DisplayName;
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+}

LanMountainDesktop/Views/Components/CnrDailyNewsWidget.axaml

@@ -0,0 +1,148 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.CnrDailyNewsWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="#D5D5D5"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="16,12,16,12">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#F9F9F9"
+                    CornerRadius="24"
+                    Padding="16,14,16,14">
+                <Grid RowDefinitions="Auto,Auto,Auto"
+                      RowSpacing="10">
+                    <Grid Grid.Row="0"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="10">
+                        <StackPanel Orientation="Horizontal"
+                                    Spacing="0"
+                                    VerticalAlignment="Center">
+                            <TextBlock x:Name="BrandPrimaryTextBlock"
+                                       Text="&#22830;&#24191;&#32593;"
+                                       Foreground="#D6272E"
+                                       FontSize="28"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis" />
+                            <TextBlock x:Name="BrandSecondaryTextBlock"
+                                       Text="&#183;&#22836;&#26465;"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis" />
+                        </StackPanel>
+
+                        <Button x:Name="RefreshButton"
+                                Grid.Column="1"
+                                Width="116"
+                                Height="42"
+                                CornerRadius="21"
+                                Background="#F0F0F0"
+                                BorderBrush="Transparent"
+                                BorderThickness="0"
+                                Padding="10,0"
+                                Focusable="False">
+                            <StackPanel Orientation="Horizontal"
+                                        Spacing="4"
+                                        HorizontalAlignment="Center"
+                                        VerticalAlignment="Center">
+                                <TextBlock x:Name="RefreshGlyphTextBlock"
+                                           Text="&#8635;"
+                                           Foreground="#52575F"
+                                           FontSize="19"
+                                           FontWeight="SemiBold"
+                                           VerticalAlignment="Center" />
+                                <TextBlock x:Name="RefreshLabelTextBlock"
+                                           Text="&#25442;&#19968;&#25442;"
+                                           Foreground="#202327"
+                                           FontSize="25"
+                                           FontWeight="SemiBold"
+                                           VerticalAlignment="Center" />
+                            </StackPanel>
+                        </Button>
+                    </Grid>
+
+                    <Grid x:Name="NewsItem1Grid"
+                          Grid.Row="1"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="12"
+                          PointerPressed="OnNewsItem1PointerPressed">
+                        <Grid ColumnDefinitions="Auto,*"
+                              ColumnSpacing="4"
+                              VerticalAlignment="Center">
+                            <TextBlock x:Name="News1PrefixTextBlock"
+                                       Text="&#28909;&#28857; |"
+                                       Foreground="#D6272E"
+                                       FontSize="25"
+                                       FontWeight="SemiBold"
+                                       VerticalAlignment="Top" />
+                            <TextBlock x:Name="News1TitleTextBlock"
+                                       Grid.Column="1"
+                                       Text="Headline"
+                                       Foreground="#202327"
+                                       FontSize="25"
+                                       FontWeight="SemiBold"
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="2" />
+                        </Grid>
+
+                        <Border x:Name="News1ImageHost"
+                                Grid.Column="1"
+                                Width="160"
+                                Height="90"
+                                CornerRadius="16"
+                                ClipToBounds="True"
+                                Background="#E6E6E6">
+                            <Image x:Name="News1Image"
+                                   Stretch="UniformToFill" />
+                        </Border>
+                    </Grid>
+
+                    <Grid x:Name="NewsItem2Grid"
+                          Grid.Row="2"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="12"
+                          PointerPressed="OnNewsItem2PointerPressed">
+                        <TextBlock x:Name="News2TitleTextBlock"
+                                   Text="Headline"
+                                   Foreground="#202327"
+                                   FontSize="25"
+                                   FontWeight="SemiBold"
+                                   TextWrapping="Wrap"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="2"
+                                   VerticalAlignment="Center" />
+
+                        <Border x:Name="News2ImageHost"
+                                Grid.Column="1"
+                                Width="160"
+                                Height="90"
+                                CornerRadius="16"
+                                ClipToBounds="True"
+                                Background="#E6E6E6">
+                            <Image x:Name="News2Image"
+                                   Stretch="UniformToFill" />
+                        </Border>
+                    </Grid>
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/CnrDailyNewsWidget.axaml.cs

@@ -0,0 +1,534 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+using Avalonia.Media.Imaging;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class CnrDailyNewsWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+    private static readonly HttpClient ImageHttpClient = new()
+    {
+        Timeout = TimeSpan.FromSeconds(8)
+    };
+
+    private const string BrowserUserAgent =
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0 Safari/537.36";
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(30)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly Bitmap?[] _newsBitmaps = new Bitmap?[2];
+    private readonly string?[] _newsUrls = new string?[2];
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    public CnrDailyNewsWidget()
+    {
+        InitializeComponent();
+
+        BrandPrimaryTextBlock.FontFamily = MiSansFontFamily;
+        BrandSecondaryTextBlock.FontFamily = MiSansFontFamily;
+        RefreshGlyphTextBlock.FontFamily = MiSansFontFamily;
+        RefreshLabelTextBlock.FontFamily = MiSansFontFamily;
+        News1PrefixTextBlock.FontFamily = MiSansFontFamily;
+        News1TitleTextBlock.FontFamily = MiSansFontFamily;
+        News2TitleTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        RefreshButton.Click += OnRefreshButtonClick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyLoadingState();
+        UpdateRefreshButtonState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshNewsAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        if (_isAttached)
+        {
+            _ = RefreshNewsAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        UpdateRefreshButtonState();
+        _refreshTimer.Start();
+        _ = RefreshNewsAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+        DisposeNewsBitmaps();
+        UpdateRefreshButtonState();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isRefreshing)
+        {
+            return;
+        }
+
+        await RefreshNewsAsync(forceRefresh: true);
+        e.Handled = true;
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshNewsAsync(forceRefresh: false);
+    }
+
+    private void OnNewsItem1PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenNewsUrl(0);
+        e.Handled = true;
+    }
+
+    private void OnNewsItem2PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenNewsUrl(1);
+        e.Handled = true;
+    }
+
+    private async Task RefreshNewsAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateRefreshButtonState();
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new DailyNewsQuery(
+                Locale: _languageCode,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetDailyNewsAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            await ApplySnapshotAsync(result.Data, cts.Token);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+            UpdateRefreshButtonState();
+        }
+    }
+
+    private async Task ApplySnapshotAsync(DailyNewsSnapshot snapshot, CancellationToken cancellationToken)
+    {
+        var items = snapshot.Items is null
+            ? []
+            : snapshot.Items.Take(2).ToArray();
+
+        var item1 = items.Length > 0 ? items[0] : null;
+        var item2 = items.Length > 1 ? items[1] : null;
+
+        News1PrefixTextBlock.IsVisible = item1 is not null;
+        News1TitleTextBlock.Text = NormalizeCompactText(item1?.Title);
+        News2TitleTextBlock.Text = NormalizeCompactText(item2?.Title);
+
+        _newsUrls[0] = NormalizeHttpUrl(item1?.Url);
+        _newsUrls[1] = NormalizeHttpUrl(item2?.Url);
+        UpdateNewsInteractionState();
+
+        StatusTextBlock.IsVisible = false;
+        UpdateAdaptiveLayout();
+
+        var loadTasks = new[]
+        {
+            TryDownloadBitmapAsync(item1?.ImageUrl, cancellationToken),
+            TryDownloadBitmapAsync(item2?.ImageUrl, cancellationToken)
+        };
+        var bitmaps = await Task.WhenAll(loadTasks);
+        if (cancellationToken.IsCancellationRequested || !_isAttached)
+        {
+            bitmaps[0]?.Dispose();
+            bitmaps[1]?.Dispose();
+            return;
+        }
+
+        SetNewsBitmap(0, bitmaps[0]);
+        SetNewsBitmap(1, bitmaps[1]);
+    }
+
+    private void ApplyLoadingState()
+    {
+        _newsUrls[0] = null;
+        _newsUrls[1] = null;
+        News1PrefixTextBlock.IsVisible = true;
+        News1TitleTextBlock.Text = L("cnrnews.widget.loading_title", "正在获取新闻热点");
+        News2TitleTextBlock.Text = L("cnrnews.widget.loading_subtitle", "请稍候");
+        StatusTextBlock.Text = L("cnrnews.widget.loading", "加载中...");
+        StatusTextBlock.IsVisible = true;
+        UpdateNewsInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        _newsUrls[0] = null;
+        _newsUrls[1] = null;
+        News1PrefixTextBlock.IsVisible = false;
+        News1TitleTextBlock.Text = L("cnrnews.widget.fallback_title", "央广网新闻暂不可用");
+        News2TitleTextBlock.Text = L("cnrnews.widget.fallback_subtitle", "点击右上角稍后重试");
+        StatusTextBlock.Text = L("cnrnews.widget.fetch_failed", "新闻获取失败");
+        StatusTextBlock.IsVisible = true;
+        SetNewsBitmap(0, null);
+        SetNewsBitmap(1, null);
+        UpdateNewsInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        RootBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 28),
+            Math.Clamp(12 * scale, 6, 20),
+            Math.Clamp(16 * scale, 8, 28),
+            Math.Clamp(12 * scale, 6, 20));
+
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(24 * scale, 12, 36));
+        CardBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22),
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22));
+
+        var headlineFont = Math.Clamp(28 * scale, 13, 36);
+        BrandPrimaryTextBlock.FontSize = headlineFont;
+        BrandSecondaryTextBlock.FontSize = headlineFont;
+
+        var refreshHeight = Math.Clamp(42 * scale, 24, 52);
+        var refreshWidth = Math.Clamp(116 * scale, 76, 152);
+        RefreshButton.Height = refreshHeight;
+        RefreshButton.Width = refreshWidth;
+        RefreshButton.CornerRadius = new CornerRadius(refreshHeight / 2d);
+        RefreshGlyphTextBlock.FontSize = Math.Clamp(19 * scale, 11, 26);
+        RefreshLabelTextBlock.FontSize = Math.Clamp(25 * scale, 12, 32);
+
+        var imageWidth = Math.Clamp(totalWidth * 0.23, 68, 170);
+        var imageHeight = Math.Clamp(imageWidth * 0.56, 38, 94);
+        News1ImageHost.Width = imageWidth;
+        News1ImageHost.Height = imageHeight;
+        News2ImageHost.Width = imageWidth;
+        News2ImageHost.Height = imageHeight;
+        News1ImageHost.CornerRadius = new CornerRadius(Math.Clamp(16 * scale, 8, 22));
+        News2ImageHost.CornerRadius = new CornerRadius(Math.Clamp(16 * scale, 8, 22));
+
+        var columnGap = Math.Clamp(12 * scale, 6, 18);
+        NewsItem1Grid.ColumnSpacing = columnGap;
+        NewsItem2Grid.ColumnSpacing = columnGap;
+        NewsItem1Grid.ColumnDefinitions[1].Width = new GridLength(imageWidth);
+        NewsItem2Grid.ColumnDefinitions[1].Width = new GridLength(imageWidth);
+
+        var availableTextWidth = Math.Max(72, totalWidth - RootBorder.Padding.Left - RootBorder.Padding.Right - imageWidth - columnGap - Math.Clamp(24 * scale, 12, 36));
+        News1TitleTextBlock.MaxWidth = availableTextWidth;
+        News2TitleTextBlock.MaxWidth = availableTextWidth;
+
+        var newsFont = Math.Clamp(25 * scale, 11, 32);
+        News1PrefixTextBlock.FontSize = newsFont;
+        News1TitleTextBlock.FontSize = newsFont;
+        News2TitleTextBlock.FontSize = newsFont;
+        StatusTextBlock.FontSize = Math.Clamp(16 * scale, 9, 24);
+
+        var compactLayout = totalHeight < _currentCellSize * 1.7;
+        News1TitleTextBlock.MaxLines = compactLayout ? 1 : 2;
+        News2TitleTextBlock.MaxLines = compactLayout ? 1 : 2;
+    }
+
+    private void UpdateRefreshButtonState()
+    {
+        RefreshButton.IsEnabled = !_isRefreshing;
+        RefreshButton.Opacity = _isAttached ? 1.0 : 0.85;
+        RefreshGlyphTextBlock.Opacity = _isRefreshing ? 0.56 : 1.0;
+        RefreshLabelTextBlock.Opacity = _isRefreshing ? 0.56 : 1.0;
+    }
+
+    private void UpdateNewsInteractionState()
+    {
+        var item1Enabled = !string.IsNullOrWhiteSpace(_newsUrls[0]);
+        var item2Enabled = !string.IsNullOrWhiteSpace(_newsUrls[1]);
+
+        NewsItem1Grid.IsHitTestVisible = item1Enabled;
+        NewsItem2Grid.IsHitTestVisible = item2Enabled;
+        NewsItem1Grid.Opacity = item1Enabled ? 1.0 : 0.72;
+        NewsItem2Grid.Opacity = item2Enabled ? 1.0 : 0.72;
+    }
+
+    private static async Task<Bitmap?> TryDownloadBitmapAsync(string? imageUrl, CancellationToken cancellationToken)
+    {
+        var normalizedUrl = NormalizeHttpUrl(imageUrl);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return null;
+        }
+
+        try
+        {
+            using var request = new HttpRequestMessage(HttpMethod.Get, normalizedUrl);
+            request.Headers.TryAddWithoutValidation("User-Agent", BrowserUserAgent);
+            request.Headers.TryAddWithoutValidation("Accept", "image/avif,image/webp,image/apng,image/*,*/*;q=0.8");
+            using var response = await ImageHttpClient.SendAsync(
+                request,
+                HttpCompletionOption.ResponseHeadersRead,
+                cancellationToken);
+            if (!response.IsSuccessStatusCode)
+            {
+                return null;
+            }
+
+            await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            var memory = new MemoryStream();
+            await stream.CopyToAsync(memory, cancellationToken);
+            memory.Position = 0;
+            return new Bitmap(memory);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private void TryOpenNewsUrl(int index)
+    {
+        if (index < 0 || index >= _newsUrls.Length)
+        {
+            return;
+        }
+
+        var normalizedUrl = NormalizeHttpUrl(_newsUrls[index]);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return;
+        }
+
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = normalizedUrl,
+                UseShellExecute = true
+            };
+            Process.Start(startInfo);
+        }
+        catch
+        {
+            // Ignore malformed URLs or shell launch failures.
+        }
+    }
+
+    private static string? NormalizeHttpUrl(string? rawUrl)
+    {
+        if (string.IsNullOrWhiteSpace(rawUrl))
+        {
+            return null;
+        }
+
+        var candidate = rawUrl.Trim();
+        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
+        {
+            return null;
+        }
+
+        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
+            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
+        {
+            return null;
+        }
+
+        return uri.ToString();
+    }
+
+    private void SetNewsBitmap(int index, Bitmap? bitmap)
+    {
+        if (index < 0 || index >= _newsBitmaps.Length)
+        {
+            bitmap?.Dispose();
+            return;
+        }
+
+        var imageControl = index == 0 ? News1Image : News2Image;
+        var oldBitmap = _newsBitmaps[index];
+        if (ReferenceEquals(imageControl.Source, oldBitmap))
+        {
+            imageControl.Source = null;
+        }
+
+        oldBitmap?.Dispose();
+        _newsBitmaps[index] = bitmap;
+        imageControl.Source = bitmap;
+    }
+
+    private void DisposeNewsBitmaps()
+    {
+        SetNewsBitmap(0, null);
+        SetNewsBitmap(1, null);
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.0);
+        var widthScale = Bounds.Width > 1
+            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.56, 2.0)
+            : 1;
+        var heightScale = Bounds.Height > 1
+            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.56, 2.0)
+            : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.56, 2.0);
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+}

LanMountainDesktop/Views/Components/DailyArtworkWidget.axaml

@@ -18,7 +18,8 @@
             <Border x:Name="ArtworkPanel"
                     Grid.Column="0"
                     ClipToBounds="True"
-                    Background="#B8AE9A">
+                    Background="#B8AE9A"
+                    PointerPressed="OnArtworkPanelPointerPressed">
                 <Grid>
                     <Image x:Name="ArtworkImage"
                            Stretch="UniformToFill" />
@@ -34,12 +35,14 @@
                                    FontSize="44"
                                    FontWeight="Bold"
                                    FontFeatures="tnum"
+                                   TextTrimming="CharacterEllipsis"
                                    LineHeight="46" />
                         <TextBlock x:Name="WeekdayTextBlock"
                                    Text="星期二"
                                    Foreground="#F9F9F9"
                                    FontSize="44"
                                    FontWeight="Bold"
+                                   TextTrimming="CharacterEllipsis"
                                    LineHeight="46" />
                     </StackPanel>
                 </Grid>
@@ -48,7 +51,8 @@
             <Border Grid.Column="1"
                     x:Name="InfoPanel"
                     Background="#111418"
-                    Padding="18,14,18,14">
+                    Padding="18,14,18,14"
+                    PointerPressed="OnInfoPanelPointerPressed">
                 <Grid>
                     <Canvas x:Name="BrickPatternCanvas"
                             IsHitTestVisible="False"
@@ -76,7 +80,8 @@
                                    FontSize="44"
                                    FontWeight="Bold"
                                    TextWrapping="Wrap"
-                                   MaxLines="2"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="4"
                                    Margin="0,0,0,8" />
 
                         <Border x:Name="RightPanelSeparator"
@@ -96,15 +101,17 @@
                                        FontSize="26"
                                        FontWeight="SemiBold"
                                        TextWrapping="Wrap"
-                                       MaxLines="2" />
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="3" />
                             <TextBlock x:Name="YearTextBlock"
                                        Text="1754"
                                        Foreground="#D7DCE3"
                                        FontSize="22"
                                        FontWeight="Medium"
                                        FontFeatures="tnum"
-                                       TextWrapping="NoWrap"
-                                       MaxLines="1" />
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="2" />
                         </StackPanel>
                     </Grid>
                 </Grid>

LanMountainDesktop/Views/Components/DailyArtworkWidget.axaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Globalization;
 using System.IO;
 using System.Net.Http;
@@ -8,6 +9,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Input;
 using Avalonia.Media;
 using Avalonia.Media.Imaging;
 using Avalonia.Threading;
@@ -32,6 +34,9 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
 
     private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
     private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly FontWeight[] TitleWeightCandidates = new[] { FontWeight.Bold, FontWeight.SemiBold, FontWeight.Medium, FontWeight.Normal };
+    private static readonly FontWeight[] ArtistWeightCandidates = new[] { FontWeight.SemiBold, FontWeight.Medium, FontWeight.Normal };
+    private static readonly FontWeight[] SecondaryWeightCandidates = new[] { FontWeight.Medium, FontWeight.Normal, FontWeight.Light };
 
     private static readonly HttpClient ImageHttpClient = new()
     {
@@ -62,6 +67,8 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
     private double _currentCellSize = BaseCellSize;
     private bool _isAttached;
     private bool _isRefreshing;
+    private string? _currentArtworkSourceUrl;
+    private string? _currentArtworkImageUrl;
 
     public DailyArtworkWidget()
     {
@@ -102,7 +109,7 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
             0,
             0,
             Math.Clamp(16 * scale, 8, 26));
-        DateInfoStack.Spacing = Math.Clamp(2 * scale, 1, 6);
+        DateInfoStack.Spacing = Math.Clamp(4 * scale, 2, 10);
 
         StatusTextBlock.FontSize = Math.Clamp(16 * scale, 10, 24);
 
@@ -154,6 +161,28 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         await RefreshArtworkAsync(forceRefresh: false);
     }
 
+    private void OnArtworkPanelPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        _ = RefreshArtworkAsync(forceRefresh: true);
+        e.Handled = true;
+    }
+
+    private void OnInfoPanelPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenArtworkSourceUrl();
+        e.Handled = true;
+    }
+
     private async Task RefreshArtworkAsync(bool forceRefresh)
     {
         if (!_isAttached || _isRefreshing)
@@ -222,6 +251,8 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         ArtistTextBlock.Text = NormalizeCompactText(artist);
 
         YearTextBlock.Text = ResolveYearText(snapshot);
+        _currentArtworkSourceUrl = snapshot.ArtworkUrl;
+        _currentArtworkImageUrl = snapshot.ImageUrl;
         StatusTextBlock.IsVisible = false;
 
         UpdateAdaptiveLayout();
@@ -352,6 +383,8 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
 
     private void ApplyLoadingState()
     {
+        _currentArtworkSourceUrl = null;
+        _currentArtworkImageUrl = null;
         StatusTextBlock.IsVisible = true;
         StatusTextBlock.Text = L("artwork.widget.loading", "Loading...");
         PaintingTitleTextBlock.Text = BuildQuotedTitle(L("artwork.widget.loading_title", "Daily Artwork"));
@@ -362,6 +395,8 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
 
     private void ApplyFailedState()
     {
+        _currentArtworkSourceUrl = null;
+        _currentArtworkImageUrl = null;
         StatusTextBlock.IsVisible = true;
         StatusTextBlock.Text = L("artwork.widget.fetch_failed", "Artwork fetch failed");
         PaintingTitleTextBlock.Text = BuildQuotedTitle(L("artwork.widget.fallback_title", "Daily Artwork"));
@@ -384,71 +419,137 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         var rightContentWidth = Math.Max(58, rightPanelWidth - InfoPanel.Padding.Left - InfoPanel.Padding.Right);
         var leftPanelWidth = Math.Max(84, totalWidth - rightPanelWidth);
         var leftContentWidth = Math.Max(52, leftPanelWidth - DateInfoStack.Margin.Left - 10);
+        var leftContentHeight = Math.Max(30, totalHeight - DateInfoStack.Margin.Bottom - 10);
+
+        var dateStackSpacing = Math.Clamp(4 * scale, 2, 10);
+        DateInfoStack.Spacing = dateStackSpacing;
+        DateInfoStack.MaxWidth = leftContentWidth;
+        var leftSingleLineHeight = Math.Max(12, (leftContentHeight - dateStackSpacing) / 2d);
 
         var dateBase = Math.Clamp(44 * scale, 16, 62);
         DateTextBlock.FontSize = FitFontSize(
             DateTextBlock.Text,
             leftContentWidth,
-            Math.Max(18, totalHeight * 0.20),
+            leftSingleLineHeight,
             maxLines: 1,
             minFontSize: Math.Max(12, dateBase * 0.68),
             maxFontSize: dateBase,
             weight: FontWeight.Bold,
-            lineHeightFactor: 1.00);
-        DateTextBlock.LineHeight = DateTextBlock.FontSize * 1.00;
+            lineHeightFactor: 1.10);
+        DateTextBlock.LineHeight = DateTextBlock.FontSize * 1.10;
 
         WeekdayTextBlock.FontSize = FitFontSize(
             WeekdayTextBlock.Text,
             leftContentWidth,
-            Math.Max(18, totalHeight * 0.21),
+            leftSingleLineHeight,
             maxLines: 1,
             minFontSize: Math.Max(12, dateBase * 0.68),
             maxFontSize: dateBase,
             weight: FontWeight.Bold,
-            lineHeightFactor: 1.00);
-        WeekdayTextBlock.LineHeight = WeekdayTextBlock.FontSize * 1.00;
+            lineHeightFactor: 1.10);
+        WeekdayTextBlock.LineHeight = WeekdayTextBlock.FontSize * 1.10;
 
+        var rightContentHeight = Math.Max(42, totalHeight - InfoPanel.Padding.Top - InfoPanel.Padding.Bottom);
+        var titleBottomMargin = Math.Clamp(8 * scale, 4, 14);
+        var separatorBottomMargin = Math.Clamp(10 * scale, 4, 14);
+        var bottomStackSpacing = Math.Clamp(3 * scale, 2, 8);
+        var reservedHeight = titleBottomMargin + separatorBottomMargin + bottomStackSpacing + 3;
+        var textHeightBudget = Math.Max(24, rightContentHeight - reservedHeight);
         var titleBase = Math.Clamp(44 * scale, 16, 58);
-        PaintingTitleTextBlock.MaxWidth = rightContentWidth;
-        PaintingTitleTextBlock.FontSize = FitFontSize(
+        var artistBase = Math.Clamp(26 * scale, 11, 34);
+        var yearBase = Math.Clamp(22 * scale, 10, 30);
+        var titleMin = Math.Max(9.2, titleBase * 0.42);
+        var artistMin = Math.Max(8.4, artistBase * 0.50);
+        var yearMin = Math.Max(8.0, yearBase * 0.54);
+
+        var titleDemand = Math.Clamp(NormalizeCompactText(PaintingTitleTextBlock.Text).Length, 6, 96);
+        var artistDemand = Math.Clamp(NormalizeCompactText(ArtistTextBlock.Text).Length, 4, 72);
+        var yearDemand = Math.Clamp(NormalizeCompactText(YearTextBlock.Text).Length, 2, 48);
+
+        var minTitleHeight = Math.Max(10, titleMin * 1.10 * 2);
+        var minArtistHeight = Math.Max(8, artistMin * 1.14);
+        var minYearHeight = Math.Max(8, yearMin * 1.08);
+        var minTextHeightTotal = minTitleHeight + minArtistHeight + minYearHeight;
+
+        double titleHeightBudget;
+        double artistHeightBudget;
+        double yearHeightBudget;
+        if (textHeightBudget <= minTextHeightTotal + 0.6)
+        {
+            var compression = textHeightBudget / Math.Max(1, minTextHeightTotal);
+            titleHeightBudget = Math.Max(9, minTitleHeight * compression);
+            artistHeightBudget = Math.Max(7, minArtistHeight * compression);
+            yearHeightBudget = Math.Max(7, minYearHeight * compression);
+        }
+        else
+        {
+            var extraHeight = textHeightBudget - minTextHeightTotal;
+            var titleWeight = titleDemand + 8d;
+            var artistWeight = artistDemand + 4d;
+            var yearWeight = yearDemand + 2d;
+            var weightSum = Math.Max(1d, titleWeight + artistWeight + yearWeight);
+
+            titleHeightBudget = minTitleHeight + extraHeight * (titleWeight / weightSum);
+            artistHeightBudget = minArtistHeight + extraHeight * (artistWeight / weightSum);
+            yearHeightBudget = minYearHeight + extraHeight * (yearWeight / weightSum);
+        }
+
+        var titleLayout = FitAdaptiveTextLayout(
             PaintingTitleTextBlock.Text,
             rightContentWidth,
-            Math.Max(20, totalHeight * 0.34),
-            maxLines: 2,
-            minFontSize: Math.Max(12, titleBase * 0.62),
+            titleHeightBudget,
+            minLines: 2,
+            maxLines: 5,
+            minFontSize: titleMin,
             maxFontSize: titleBase,
-            weight: FontWeight.Bold,
-            lineHeightFactor: 1.08);
-        PaintingTitleTextBlock.LineHeight = PaintingTitleTextBlock.FontSize * 1.08;
+            weightCandidates: TitleWeightCandidates,
+            lineHeightFactor: 1.10);
+        PaintingTitleTextBlock.MaxWidth = rightContentWidth;
+        PaintingTitleTextBlock.Margin = new Thickness(0, 0, 0, titleBottomMargin);
+        PaintingTitleTextBlock.MaxLines = titleLayout.MaxLines;
+        PaintingTitleTextBlock.FontWeight = titleLayout.Weight;
+        PaintingTitleTextBlock.FontSize = titleLayout.FontSize;
+        PaintingTitleTextBlock.LineHeight = titleLayout.LineHeight;
 
-        var artistBase = Math.Clamp(26 * scale, 11, 34);
-        ArtistTextBlock.MaxWidth = rightContentWidth;
-        ArtistTextBlock.FontSize = FitFontSize(
+        if (ArtistTextBlock.Parent is StackPanel artistInfoStack)
+        {
+            artistInfoStack.Spacing = bottomStackSpacing;
+        }
+
+        var artistLayout = FitAdaptiveTextLayout(
             ArtistTextBlock.Text,
             rightContentWidth,
-            Math.Max(18, totalHeight * 0.24),
-            maxLines: 2,
-            minFontSize: Math.Max(10, artistBase * 0.72),
+            artistHeightBudget,
+            minLines: 1,
+            maxLines: 4,
+            minFontSize: artistMin,
             maxFontSize: artistBase,
-            weight: FontWeight.SemiBold,
-            lineHeightFactor: 1.12);
-        ArtistTextBlock.LineHeight = ArtistTextBlock.FontSize * 1.12;
+            weightCandidates: ArtistWeightCandidates,
+            lineHeightFactor: 1.14);
+        ArtistTextBlock.MaxWidth = rightContentWidth;
+        ArtistTextBlock.MaxLines = artistLayout.MaxLines;
+        ArtistTextBlock.FontWeight = artistLayout.Weight;
+        ArtistTextBlock.FontSize = artistLayout.FontSize;
+        ArtistTextBlock.LineHeight = artistLayout.LineHeight;
 
-        var yearBase = Math.Clamp(22 * scale, 10, 30);
-        YearTextBlock.MaxWidth = rightContentWidth;
-        YearTextBlock.FontSize = FitFontSize(
+        var yearLayout = FitAdaptiveTextLayout(
             YearTextBlock.Text,
             rightContentWidth,
-            Math.Max(14, totalHeight * 0.12),
-            maxLines: 1,
-            minFontSize: Math.Max(9.5, yearBase * 0.78),
+            yearHeightBudget,
+            minLines: 1,
+            maxLines: 3,
+            minFontSize: yearMin,
             maxFontSize: yearBase,
-            weight: FontWeight.Medium,
-            lineHeightFactor: 1.04);
-        YearTextBlock.LineHeight = YearTextBlock.FontSize * 1.04;
+            weightCandidates: SecondaryWeightCandidates,
+            lineHeightFactor: 1.08);
+        YearTextBlock.MaxWidth = rightContentWidth;
+        YearTextBlock.MaxLines = yearLayout.MaxLines;
+        YearTextBlock.FontWeight = yearLayout.Weight;
+        YearTextBlock.FontSize = yearLayout.FontSize;
+        YearTextBlock.LineHeight = yearLayout.LineHeight;
 
         RightPanelSeparator.Width = Math.Clamp(rightContentWidth * 0.58, 42, 136);
-        RightPanelSeparator.Margin = new Thickness(0, 0, 0, Math.Clamp(10 * scale, 4, 14));
+        RightPanelSeparator.Margin = new Thickness(0, 0, 0, separatorBottomMargin);
 
         BrickPatternCanvas.Opacity = totalWidth < _currentCellSize * 4.2
             ? 0.34
@@ -478,6 +579,54 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         _currentArtworkBitmap = null;
     }
 
+    private void TryOpenArtworkSourceUrl()
+    {
+        var candidate = _currentArtworkSourceUrl;
+        if (!TryNormalizeHttpUrl(candidate, out var normalizedUrl) &&
+            !TryNormalizeHttpUrl(_currentArtworkImageUrl, out normalizedUrl))
+        {
+            return;
+        }
+
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = normalizedUrl,
+                UseShellExecute = true
+            };
+            Process.Start(startInfo);
+        }
+        catch
+        {
+            // Ignore malformed URLs or shell launch failures.
+        }
+    }
+
+    private static bool TryNormalizeHttpUrl(string? rawUrl, out string normalizedUrl)
+    {
+        normalizedUrl = string.Empty;
+        if (string.IsNullOrWhiteSpace(rawUrl))
+        {
+            return false;
+        }
+
+        var candidate = rawUrl.Trim();
+        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
+        {
+            return false;
+        }
+
+        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
+            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        normalizedUrl = uri.ToString();
+        return true;
+    }
+
     private void UpdateLanguageCode()
     {
         try
@@ -623,6 +772,170 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         return best;
     }
 
+    private static AdaptiveTextLayout FitAdaptiveTextLayout(
+        string? text,
+        double maxWidth,
+        double maxHeight,
+        int minLines,
+        int maxLines,
+        double minFontSize,
+        double maxFontSize,
+        FontWeight[] weightCandidates,
+        double lineHeightFactor)
+    {
+        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
+        var safeMinLines = Math.Max(1, minLines);
+        var safeMaxLines = Math.Max(safeMinLines, maxLines);
+        var linesByHeight = ResolveMaxLinesByHeight(maxHeight, minFontSize, lineHeightFactor, safeMinLines, safeMaxLines);
+
+        var candidates = weightCandidates is { Length: > 0 }
+            ? weightCandidates
+            : new[] { FontWeight.Normal };
+
+        AdaptiveTextLayout? best = null;
+        foreach (var weight in candidates)
+        {
+            for (var lineLimit = linesByHeight; lineLimit >= safeMinLines; lineLimit--)
+            {
+                var fontSize = FitFontSize(
+                    content,
+                    maxWidth,
+                    maxHeight,
+                    lineLimit,
+                    minFontSize,
+                    maxFontSize,
+                    weight,
+                    lineHeightFactor);
+                var lineHeight = fontSize * lineHeightFactor;
+                var measuredSize = MeasureTextSize(content, fontSize, weight, Math.Max(1, maxWidth), lineHeight);
+                var measuredLineCount = ResolveLineCount(measuredSize.Height, lineHeight);
+                var overflowLines = Math.Max(0, measuredLineCount - lineLimit);
+                var overflowHeight = Math.Max(0, measuredSize.Height - maxHeight);
+                var overflowScore = overflowLines * 1000d + overflowHeight;
+                var fitsCompletely = overflowLines == 0 && overflowHeight <= 0.6;
+                var candidate = new AdaptiveTextLayout(fontSize, weight, lineLimit, lineHeight, overflowScore, fitsCompletely);
+
+                if (best is null || IsBetterAdaptiveTextCandidate(candidate, best.Value))
+                {
+                    best = candidate;
+                }
+            }
+        }
+
+        if (best is not null)
+        {
+            return best.Value;
+        }
+
+        var fallbackFontSize = Math.Max(6, minFontSize);
+        return new AdaptiveTextLayout(
+            fallbackFontSize,
+            FontWeight.Normal,
+            safeMinLines,
+            fallbackFontSize * lineHeightFactor,
+            double.MaxValue,
+            fitsCompletely: false);
+    }
+
+    private static bool IsBetterAdaptiveTextCandidate(AdaptiveTextLayout candidate, AdaptiveTextLayout best)
+    {
+        if (candidate.FitsCompletely && !best.FitsCompletely)
+        {
+            return true;
+        }
+
+        if (!candidate.FitsCompletely && best.FitsCompletely)
+        {
+            return false;
+        }
+
+        if (candidate.FitsCompletely && best.FitsCompletely)
+        {
+            if (candidate.FontSize > best.FontSize + 0.12)
+            {
+                return true;
+            }
+
+            if (Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 && candidate.MaxLines < best.MaxLines)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        if (candidate.OverflowScore < best.OverflowScore - 0.2)
+        {
+            return true;
+        }
+
+        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
+            candidate.FontSize > best.FontSize + 0.12)
+        {
+            return true;
+        }
+
+        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
+            Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 &&
+            candidate.MaxLines > best.MaxLines)
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    private static int ResolveMaxLinesByHeight(
+        double maxHeight,
+        double minFontSize,
+        double lineHeightFactor,
+        int minLines,
+        int maxLines)
+    {
+        var safeMinLines = Math.Max(1, minLines);
+        var safeMaxLines = Math.Max(safeMinLines, maxLines);
+        var lineHeight = Math.Max(1, Math.Max(6, minFontSize) * lineHeightFactor);
+        var maxHeightWithTolerance = Math.Max(1, maxHeight + 0.6);
+        var linesByHeight = (int)Math.Floor(maxHeightWithTolerance / lineHeight);
+        return Math.Clamp(linesByHeight, safeMinLines, safeMaxLines);
+    }
+
+    private static int ResolveLineCount(double measuredHeight, double lineHeight)
+    {
+        return Math.Max(1, (int)Math.Ceiling(measuredHeight / Math.Max(1, lineHeight)));
+    }
+
+    private readonly struct AdaptiveTextLayout
+    {
+        public AdaptiveTextLayout(
+            double fontSize,
+            FontWeight weight,
+            int maxLines,
+            double lineHeight,
+            double overflowScore,
+            bool fitsCompletely)
+        {
+            FontSize = fontSize;
+            Weight = weight;
+            MaxLines = Math.Max(1, maxLines);
+            LineHeight = lineHeight;
+            OverflowScore = overflowScore;
+            FitsCompletely = fitsCompletely;
+        }
+
+        public double FontSize { get; }
+
+        public FontWeight Weight { get; }
+
+        public int MaxLines { get; }
+
+        public double LineHeight { get; }
+
+        public double OverflowScore { get; }
+
+        public bool FitsCompletely { get; }
+    }
+
     private static Size MeasureTextSize(string text, double fontSize, FontWeight weight, double maxWidth, double lineHeight)
     {
         var probe = new TextBlock

LanMountainDesktop/Views/Components/DailyWordWidget.axaml

@@ -0,0 +1,127 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             xmlns:shapes="clr-namespace:Avalonia.Controls.Shapes;assembly=Avalonia.Controls"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.DailyWordWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="#D5D5D5"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="16,12,16,12">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#FBFAF8"
+                    CornerRadius="24"
+                    Padding="16,14,16,14">
+                <Grid>
+                    <Grid IsHitTestVisible="False">
+                        <shapes:Ellipse x:Name="HaloEllipse"
+                                        Width="290"
+                                        Height="290"
+                                        HorizontalAlignment="Right"
+                                        VerticalAlignment="Top"
+                                        Margin="0,-106,-52,0"
+                                        Fill="#14F3C9B4" />
+
+                        <Border x:Name="AccentCorner"
+                                Width="116"
+                                Height="116"
+                                HorizontalAlignment="Right"
+                                VerticalAlignment="Bottom"
+                                Margin="0,0,-34,-34"
+                                CornerRadius="58"
+                                Background="#23F29A7A" />
+                    </Grid>
+
+                    <Grid RowDefinitions="Auto,Auto,*,Auto"
+                          RowSpacing="7">
+                        <Grid Grid.Row="0"
+                              ColumnDefinitions="*,Auto"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="WordTextBlock"
+                                       Text="illustrate"
+                                       Foreground="#F07541"
+                                       FontSize="56"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+
+                            <Button x:Name="RefreshButton"
+                                    Grid.Column="1"
+                                    Width="38"
+                                    Height="38"
+                                    CornerRadius="19"
+                                    Background="#14A0A6AF"
+                                    BorderBrush="Transparent"
+                                    BorderThickness="0"
+                                    Padding="0"
+                                    Focusable="False">
+                                <fi:SymbolIcon x:Name="RefreshIcon"
+                                               Symbol="ArrowClockwise"
+                                               IconVariant="Regular"
+                                               FontSize="19"
+                                               Foreground="#626870" />
+                            </Button>
+                        </Grid>
+
+                        <TextBlock x:Name="PronunciationTextBlock"
+                                   Grid.Row="1"
+                                   Text="英 /ˈɪləstreɪt/ · 美 /ˈɪləstreɪt/"
+                                   Foreground="#6B7078"
+                                   FontSize="27"
+                                   FontWeight="SemiBold"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="1" />
+
+                        <TextBlock x:Name="MeaningTextBlock"
+                                   Grid.Row="2"
+                                   Text="vt. 说明；阐明；举例证明；加插图"
+                                   Foreground="#2B2F35"
+                                   FontSize="25"
+                                   FontWeight="SemiBold"
+                                   TextWrapping="Wrap"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="2"
+                                   VerticalAlignment="Top" />
+
+                        <StackPanel Grid.Row="3"
+                                    Spacing="2">
+                            <TextBlock x:Name="ExampleTextBlock"
+                                       Text="One example will suffice to illustrate the point."
+                                       Foreground="#2B2F35"
+                                       FontSize="22"
+                                       FontWeight="Medium"
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="2" />
+                            <TextBlock x:Name="ExampleTranslationTextBlock"
+                                       Text="一个例子就足以说明这个观点。"
+                                       Foreground="#7A8088"
+                                       FontSize="20"
+                                       FontWeight="Medium"
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1" />
+                        </StackPanel>
+                    </Grid>
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/DailyWordWidget.axaml.cs

@@ -0,0 +1,502 @@
+using System;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class DailyWordWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromHours(6)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    public DailyWordWidget()
+    {
+        InitializeComponent();
+
+        WordTextBlock.FontFamily = MiSansFontFamily;
+        PronunciationTextBlock.FontFamily = MiSansFontFamily;
+        MeaningTextBlock.FontFamily = MiSansFontFamily;
+        ExampleTextBlock.FontFamily = MiSansFontFamily;
+        ExampleTranslationTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        RefreshButton.Click += OnRefreshButtonClick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyLoadingState();
+        UpdateRefreshButtonState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshWordAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        if (_isAttached)
+        {
+            _ = RefreshWordAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        UpdateRefreshButtonState();
+        _refreshTimer.Start();
+        _ = RefreshWordAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+        UpdateRefreshButtonState();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isRefreshing)
+        {
+            return;
+        }
+
+        await RefreshWordAsync(forceRefresh: true);
+        e.Handled = true;
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshWordAsync(forceRefresh: false);
+    }
+
+    private async Task RefreshWordAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateRefreshButtonState();
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new DailyWordQuery(
+                Locale: _languageCode,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetDailyWordAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            ApplySnapshot(result.Data);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+            UpdateRefreshButtonState();
+        }
+    }
+
+    private void ApplySnapshot(DailyWordSnapshot snapshot)
+    {
+        WordTextBlock.Text = NormalizeCompactText(snapshot.Word);
+        PronunciationTextBlock.Text = BuildPronunciationText(snapshot);
+        MeaningTextBlock.Text = BuildMeaningText(snapshot.Meaning);
+        ExampleTextBlock.Text = BuildExampleText(snapshot.ExampleSentence);
+        ExampleTranslationTextBlock.Text = BuildExampleTranslation(snapshot.ExampleTranslation);
+
+        StatusTextBlock.IsVisible = false;
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyLoadingState()
+    {
+        WordTextBlock.Text = L("dailyword.widget.loading_word", "daily word");
+        PronunciationTextBlock.Text = L("dailyword.widget.loading_pronunciation", "Fetching pronunciation...");
+        MeaningTextBlock.Text = L("dailyword.widget.loading_meaning", "Fetching meaning...");
+        ExampleTextBlock.Text = L("dailyword.widget.loading_example", "Fetching example sentence...");
+        ExampleTranslationTextBlock.Text = L("dailyword.widget.loading_example_translation", "Loading...");
+        StatusTextBlock.Text = L("dailyword.widget.loading", "Loading...");
+        StatusTextBlock.IsVisible = true;
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        WordTextBlock.Text = L("dailyword.widget.fallback_word", "daily word");
+        PronunciationTextBlock.Text = L("dailyword.widget.fallback_pronunciation", "Pronunciation unavailable");
+        MeaningTextBlock.Text = L("dailyword.widget.fallback_meaning", "Youdao dictionary is temporarily unavailable.");
+        ExampleTextBlock.Text = L("dailyword.widget.fallback_example", "Tap the refresh button and try again.");
+        ExampleTranslationTextBlock.Text = L("dailyword.widget.fallback_example_translation", "It will retry when network recovers.");
+        StatusTextBlock.Text = L("dailyword.widget.fetch_failed", "Daily word fetch failed");
+        StatusTextBlock.IsVisible = true;
+        UpdateAdaptiveLayout();
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        RootBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 26),
+            Math.Clamp(12 * scale, 6, 20),
+            Math.Clamp(16 * scale, 8, 26),
+            Math.Clamp(12 * scale, 6, 20));
+
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(24 * scale, 12, 36));
+        CardBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22),
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22));
+
+        var refreshSize = Math.Clamp(38 * scale, 22, 48);
+        RefreshButton.Width = refreshSize;
+        RefreshButton.Height = refreshSize;
+        RefreshButton.CornerRadius = new CornerRadius(refreshSize / 2d);
+        RefreshIcon.FontSize = Math.Clamp(19 * scale, 12, 26);
+
+        HaloEllipse.Width = Math.Clamp(totalWidth * 0.52, 120, 340);
+        HaloEllipse.Height = HaloEllipse.Width;
+        AccentCorner.Width = Math.Clamp(totalWidth * 0.20, 66, 132);
+        AccentCorner.Height = AccentCorner.Width;
+        AccentCorner.CornerRadius = new CornerRadius(AccentCorner.Width / 2d);
+
+        var horizontalPadding = RootBorder.Padding.Left + RootBorder.Padding.Right + CardBorder.Padding.Left + CardBorder.Padding.Right;
+        var contentWidth = Math.Max(98, totalWidth - horizontalPadding);
+        var wordWidth = Math.Max(70, contentWidth - refreshSize - Math.Clamp(8 * scale, 5, 14));
+        WordTextBlock.MaxWidth = wordWidth;
+        PronunciationTextBlock.MaxWidth = contentWidth;
+        MeaningTextBlock.MaxWidth = contentWidth;
+        ExampleTextBlock.MaxWidth = contentWidth;
+        ExampleTranslationTextBlock.MaxWidth = contentWidth;
+
+        var compactLayout = totalHeight < _currentCellSize * 1.72;
+        MeaningTextBlock.MaxLines = compactLayout ? 1 : 2;
+        ExampleTextBlock.MaxLines = compactLayout ? 1 : 2;
+        ExampleTranslationTextBlock.IsVisible = !compactLayout;
+        ExampleTranslationTextBlock.MaxLines = 1;
+
+        var contentHeight = Math.Max(52, totalHeight - RootBorder.Padding.Top - RootBorder.Padding.Bottom - CardBorder.Padding.Top - CardBorder.Padding.Bottom);
+        var wordHeightBudget = Math.Max(18, contentHeight * 0.24);
+        var pronunciationHeightBudget = Math.Max(14, contentHeight * 0.16);
+        var meaningHeightBudget = Math.Max(16, contentHeight * (compactLayout ? 0.26 : 0.30));
+        var exampleHeightBudget = Math.Max(16, contentHeight - wordHeightBudget - pronunciationHeightBudget - meaningHeightBudget - Math.Clamp(16 * scale, 8, 24));
+        if (!ExampleTranslationTextBlock.IsVisible)
+        {
+            exampleHeightBudget += Math.Clamp(11 * scale, 5, 18);
+        }
+
+        var wordBase = Math.Clamp(56 * scale, 18, 72);
+        WordTextBlock.FontSize = FitFontSize(
+            WordTextBlock.Text,
+            wordWidth,
+            wordHeightBudget,
+            maxLines: 1,
+            minFontSize: Math.Max(14, wordBase * 0.56),
+            maxFontSize: wordBase,
+            weight: FontWeight.Bold,
+            lineHeightFactor: 1.04);
+        WordTextBlock.LineHeight = WordTextBlock.FontSize * 1.04;
+
+        var pronunciationBase = Math.Clamp(27 * scale, 10, 36);
+        PronunciationTextBlock.FontSize = FitFontSize(
+            PronunciationTextBlock.Text,
+            contentWidth,
+            pronunciationHeightBudget,
+            maxLines: 1,
+            minFontSize: Math.Max(8.6, pronunciationBase * 0.62),
+            maxFontSize: pronunciationBase,
+            weight: FontWeight.SemiBold,
+            lineHeightFactor: 1.08);
+        PronunciationTextBlock.LineHeight = PronunciationTextBlock.FontSize * 1.08;
+
+        var meaningBase = Math.Clamp(25 * scale, 10, 34);
+        MeaningTextBlock.FontSize = FitFontSize(
+            MeaningTextBlock.Text,
+            contentWidth,
+            meaningHeightBudget,
+            maxLines: Math.Max(1, MeaningTextBlock.MaxLines),
+            minFontSize: Math.Max(9.2, meaningBase * 0.60),
+            maxFontSize: meaningBase,
+            weight: FontWeight.SemiBold,
+            lineHeightFactor: 1.10);
+        MeaningTextBlock.LineHeight = MeaningTextBlock.FontSize * 1.10;
+
+        var exampleBase = Math.Clamp(22 * scale, 9, 30);
+        ExampleTextBlock.FontSize = FitFontSize(
+            ExampleTextBlock.Text,
+            contentWidth,
+            exampleHeightBudget,
+            maxLines: Math.Max(1, ExampleTextBlock.MaxLines),
+            minFontSize: Math.Max(8.8, exampleBase * 0.58),
+            maxFontSize: exampleBase,
+            weight: FontWeight.Medium,
+            lineHeightFactor: 1.08);
+        ExampleTextBlock.LineHeight = ExampleTextBlock.FontSize * 1.08;
+
+        var translationBase = Math.Clamp(20 * scale, 8, 28);
+        ExampleTranslationTextBlock.FontSize = FitFontSize(
+            ExampleTranslationTextBlock.Text,
+            contentWidth,
+            Math.Max(10, exampleHeightBudget * 0.44),
+            maxLines: 1,
+            minFontSize: Math.Max(7.8, translationBase * 0.62),
+            maxFontSize: translationBase,
+            weight: FontWeight.Medium,
+            lineHeightFactor: 1.06);
+        ExampleTranslationTextBlock.LineHeight = ExampleTranslationTextBlock.FontSize * 1.06;
+
+        StatusTextBlock.FontSize = Math.Clamp(16 * scale, 9, 24);
+    }
+
+    private void UpdateRefreshButtonState()
+    {
+        RefreshButton.IsEnabled = !_isRefreshing;
+        RefreshButton.Opacity = _isAttached ? 1.0 : 0.85;
+        RefreshIcon.Opacity = _isRefreshing ? 0.56 : 1.0;
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.0);
+        var widthScale = Bounds.Width > 1
+            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.56, 2.0)
+            : 1;
+        var heightScale = Bounds.Height > 1
+            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.56, 2.0)
+            : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.56, 2.0);
+    }
+
+    private string BuildPronunciationText(DailyWordSnapshot snapshot)
+    {
+        var uk = NormalizeCompactText(snapshot.UkPronunciation);
+        var us = NormalizeCompactText(snapshot.UsPronunciation);
+        var isZh = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase);
+
+        if (!string.IsNullOrWhiteSpace(uk) && !string.IsNullOrWhiteSpace(us))
+        {
+            return isZh
+                ? $"英 /{uk}/ · 美 /{us}/"
+                : $"UK /{uk}/ · US /{us}/";
+        }
+
+        if (!string.IsNullOrWhiteSpace(uk))
+        {
+            return isZh ? $"英 /{uk}/" : $"UK /{uk}/";
+        }
+
+        if (!string.IsNullOrWhiteSpace(us))
+        {
+            return isZh ? $"美 /{us}/" : $"US /{us}/";
+        }
+
+        return isZh ? "英/美 发音暂无" : "Pronunciation unavailable";
+    }
+
+    private static string BuildMeaningText(string? rawMeaning)
+    {
+        var normalized = NormalizeCompactText(rawMeaning);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? "Meaning unavailable"
+            : normalized;
+    }
+
+    private static string BuildExampleText(string? sentence)
+    {
+        var normalized = NormalizeCompactText(sentence);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? "No example sentence."
+            : normalized;
+    }
+
+    private static string BuildExampleTranslation(string? translation)
+    {
+        var normalized = NormalizeCompactText(translation);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? string.Empty
+            : normalized;
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+
+    private static double FitFontSize(
+        string? text,
+        double maxWidth,
+        double maxHeight,
+        int maxLines,
+        double minFontSize,
+        double maxFontSize,
+        FontWeight weight,
+        double lineHeightFactor)
+    {
+        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
+        var min = Math.Max(6, minFontSize);
+        var max = Math.Max(min, maxFontSize);
+        var low = min;
+        var high = max;
+        var best = min;
+
+        for (var i = 0; i < 18; i++)
+        {
+            var candidate = (low + high) / 2d;
+            var lineHeight = candidate * lineHeightFactor;
+            var size = MeasureTextSize(content, candidate, weight, Math.Max(1, maxWidth), lineHeight);
+            var lineCount = Math.Max(1, (int)Math.Ceiling(size.Height / Math.Max(1, lineHeight)));
+            var fits = size.Height <= maxHeight + 0.6 && lineCount <= Math.Max(1, maxLines);
+
+            if (fits)
+            {
+                best = candidate;
+                low = candidate;
+            }
+            else
+            {
+                high = candidate;
+            }
+        }
+
+        return best;
+    }
+
+    private static Size MeasureTextSize(string text, double fontSize, FontWeight weight, double maxWidth, double lineHeight)
+    {
+        var probe = new TextBlock
+        {
+            Text = text,
+            FontFamily = MiSansFontFamily,
+            FontSize = fontSize,
+            FontWeight = weight,
+            TextWrapping = TextWrapping.Wrap,
+            LineHeight = lineHeight
+        };
+
+        probe.Measure(new Size(Math.Max(1, maxWidth), double.PositiveInfinity));
+        return probe.DesiredSize;
+    }
+}

LanMountainDesktop/Views/Components/DesktopComponentRuntimeRegistry.cs

@@ -134,6 +134,11 @@ public sealed class DesktopComponentRuntimeRegistry
                     "component.weather_clock",
                     () => new WeatherClockWidget(),
                     cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopWorldClock,
+                    "component.world_clock",
+                    () => new WorldClockWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.30, 10, 24)),
                 new DesktopComponentRuntimeRegistration(
                     BuiltInComponentIds.DesktopTimer,
                     "component.desktop_timer",
@@ -224,6 +229,16 @@ public sealed class DesktopComponentRuntimeRegistry
                     "component.daily_artwork",
                     () => new DailyArtworkWidget(),
                     cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopDailyWord,
+                    "component.daily_word",
+                    () => new DailyWordWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopCnrDailyNews,
+                    "component.cnr_daily_news",
+                    () => new CnrDailyNewsWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
                 new DesktopComponentRuntimeRegistration(
                     BuiltInComponentIds.DesktopWhiteboard,
                     "component.whiteboard",

LanMountainDesktop/Views/Components/ExtendedWeatherWidget.axaml.cs

@@ -20,7 +20,7 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
     private static readonly IWeatherInfoService DefaultWeatherInfoService = new XiaomiWeatherService();
 
     private readonly DispatcherTimer _refreshTimer = new() { Interval = TimeSpan.FromMinutes(12) };
-    private readonly DispatcherTimer _animationTimer = new() { Interval = UiMotionTokens.WeatherAnimationFrameInterval };
+    private readonly DispatcherTimer _animationTimer = new() { Interval = FluttermotionToken.WeatherAnimationFrameInterval };
     private readonly ScaleTransform _backgroundMotionScaleTransform = new(1, 1);
     private readonly TranslateTransform _backgroundMotionTranslateTransform = new();
     private readonly AppSettingsService _settingsService = new();
@@ -43,6 +43,7 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
     private readonly TextBlock[] _dailyHighBlocks;
     private readonly TextBlock[] _dailyLowBlocks;
     private readonly Image[] _dailyIconBlocks;
+    private readonly HyperOS3WeatherVisualKind[] _dailyIconKinds;
 
     public ExtendedWeatherWidget()
     {
@@ -76,6 +77,7 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
         [
             DailyIcon0, DailyIcon1, DailyIcon2, DailyIcon3, DailyIcon4
         ];
+        _dailyIconKinds = Enumerable.Repeat(HyperOS3WeatherVisualKind.CloudyDay, _dailyIconBlocks.Length).ToArray();
         ConfigureTextOverflowGuards();
         _refreshTimer.Tick += OnRefreshTimerTick;
         _animationTimer.Tick += OnAnimationTick;
@@ -344,6 +346,7 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
             _dailyLabelBlocks[i].Text = $"{ResolveDayLabel(date, i + 1)}·{dayText}";
             _dailyHighBlocks[i].Text = FormatTemperatureValue(daily?.HighTemperatureC);
             _dailyLowBlocks[i].Text = FormatTemperatureValue(daily?.LowTemperatureC);
+            _dailyIconKinds[i] = dayKind;
             _dailyIconBlocks[i].Source = HyperOS3WeatherAssetLoader.LoadImage(HyperOS3WeatherTheme.ResolveMiniIconAsset(dayKind));
         }
     }
@@ -371,6 +374,7 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
             _dailyLabelBlocks[i].Text = $"{ResolveDayLabel(DateOnly.FromDateTime(DateTime.Now).AddDays(i + 1), i + 1)}·{L("weather.widget.condition_cloudy", "Cloudy")}";
             _dailyHighBlocks[i].Text = "--";
             _dailyLowBlocks[i].Text = "--";
+            _dailyIconKinds[i] = HyperOS3WeatherVisualKind.CloudyDay;
             _dailyIconBlocks[i].Source = HyperOS3WeatherAssetLoader.LoadImage(HyperOS3WeatherTheme.ResolveMiniIconAsset(HyperOS3WeatherVisualKind.CloudyDay));
         }
     }
@@ -523,7 +527,9 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
             3.80);
         var hourlyTempSize = Math.Clamp(19 * hourlyCellScale, 6, 72);
         var hourlyTimeSize = Math.Clamp(14 * hourlyCellScale, 6, 52);
-        var hourlyIconSize = Math.Clamp(34 * hourlyCellScale, 8, 114);
+        var hourlyIconSize = Math.Clamp(42 * hourlyCellScale, 9, 140);
+        hourlyIconSize = Math.Min(hourlyIconSize, Math.Max(10, hourlyCellWidth * 0.86));
+        hourlyIconSize = Math.Min(hourlyIconSize, Math.Max(10, hourlyHeight * 0.56));
         var hourlyStackSpacing = Math.Clamp(2 * hourlyCellScale, 0.2, 10);
         for (var i = 0; i < _hourlyTempBlocks.Length; i++)
         {
@@ -548,7 +554,9 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
 
         var dailyLabelSize = Math.Clamp(18.5 * dailyRowScale, 6, 70);
         var dailyTempSize = Math.Clamp(19 * dailyRowScale, 6, 72);
-        var dailyIconSize = Math.Clamp(30 * dailyRowScale, 8, 102);
+        var dailyIconSize = Math.Clamp(43 * dailyRowScale, 9, 132);
+        dailyIconSize = Math.Min(dailyIconSize, Math.Max(10, dailyRowHeight * 0.92));
+        dailyIconSize = Math.Min(dailyIconSize, Math.Max(10, innerWidth * 0.14));
         var dailyLabelMaxWidth = Math.Clamp(innerWidth * 0.52, 28, 460);
         var dailyHighWidth = Math.Clamp(innerWidth * 0.14, 14, 140);
         var dailyLowWidth = Math.Clamp(innerWidth * 0.11, 12, 120);
@@ -570,8 +578,21 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
             _dailyLowBlocks[i].HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Right;
             _dailyHighBlocks[i].TextAlignment = TextAlignment.Right;
             _dailyLowBlocks[i].TextAlignment = TextAlignment.Right;
-            _dailyIconBlocks[i].Width = dailyIconSize;
-            _dailyIconBlocks[i].Height = dailyIconSize;
+            if (_dailyIconBlocks[i].Parent is Grid dailyRowGrid)
+            {
+                dailyRowGrid.ColumnSpacing = Math.Clamp(9 * dailyRowScale, 4, 18);
+            }
+
+            var dailyKind = i < _dailyIconKinds.Length
+                ? _dailyIconKinds[i]
+                : HyperOS3WeatherVisualKind.CloudyDay;
+            var dailyIconVisualSize = Math.Clamp(
+                dailyIconSize * ResolveDailyMiniIconScaleBoost(dailyKind),
+                8,
+                148);
+            dailyIconVisualSize = Math.Min(dailyIconVisualSize, Math.Max(10, dailyRowHeight * 0.94));
+            _dailyIconBlocks[i].Width = dailyIconVisualSize;
+            _dailyIconBlocks[i].Height = dailyIconVisualSize;
         }
     }
 
@@ -905,6 +926,21 @@ public partial class ExtendedWeatherWidget : UserControl, IDesktopComponentWidge
             HyperOS3WeatherVisualKind.ClearNight or HyperOS3WeatherVisualKind.CloudyNight => 1.08,
             _ => 1.0
         };
+
+    private static double ResolveDailyMiniIconScaleBoost(HyperOS3WeatherVisualKind kind) =>
+        kind switch
+        {
+            HyperOS3WeatherVisualKind.CloudyDay => 1.30,
+            HyperOS3WeatherVisualKind.CloudyNight => 1.28,
+            HyperOS3WeatherVisualKind.ClearDay => 1.26,
+            HyperOS3WeatherVisualKind.ClearNight => 1.24,
+            HyperOS3WeatherVisualKind.Fog => 1.18,
+            HyperOS3WeatherVisualKind.RainLight => 1.14,
+            HyperOS3WeatherVisualKind.RainHeavy => 1.12,
+            HyperOS3WeatherVisualKind.Snow => 1.12,
+            HyperOS3WeatherVisualKind.Storm => 1.08,
+            _ => 1.18
+        };
     private static FontWeight ToVariableWeight(double weight) => (FontWeight)(int)Math.Clamp(Math.Round(weight), 1, 1000);
     private static IBrush CreateSolidBrush(string colorHex) => new SolidColorBrush(Color.Parse(colorHex));
     private static IBrush CreateSolidBrush(string colorHex, byte alpha) { var c = Color.Parse(colorHex); return new SolidColorBrush(Color.FromArgb(alpha, c.R, c.G, c.B)); }

LanMountainDesktop/Views/Components/HourlyWeatherWidget.axaml.cs

@@ -90,7 +90,7 @@ public partial class HourlyWeatherWidget : UserControl, IDesktopComponentWidget,
 
     private readonly DispatcherTimer _backgroundAnimationTimer = new()
     {
-        Interval = UiMotionTokens.WeatherAnimationFrameInterval
+        Interval = FluttermotionToken.WeatherAnimationFrameInterval
     };
 
     private readonly AppSettingsService _settingsService = new();
@@ -1264,7 +1264,9 @@ public partial class HourlyWeatherWidget : UserControl, IDesktopComponentWidget,
         var stackSpacing = Math.Clamp(2 * hourlyCellScale, 0.2, 10);
         var hourlyTempSize = Math.Clamp(19.5 * hourlyCellScale, 6, 72);
         var hourlyTimeSize = Math.Clamp(14.5 * hourlyCellScale, 6, 50);
-        var hourlyIconSize = Math.Clamp(34 * hourlyCellScale, 8, 108);
+        var hourlyIconSize = Math.Clamp(42 * hourlyCellScale, 9, 136);
+        hourlyIconSize = Math.Min(hourlyIconSize, Math.Max(10, hourlyCellWidth * 0.86));
+        hourlyIconSize = Math.Min(hourlyIconSize, Math.Max(10, bottomZoneHeight * 0.52));
 
         for (var i = 0; i < _hourlyTimeBlocks.Length; i++)
         {

LanMountainDesktop/Views/Components/MultiDayWeatherWidget.axaml.cs

@@ -88,7 +88,7 @@ public partial class MultiDayWeatherWidget : UserControl, IDesktopComponentWidge
 
     private readonly DispatcherTimer _backgroundAnimationTimer = new()
     {
-        Interval = UiMotionTokens.WeatherAnimationFrameInterval
+        Interval = FluttermotionToken.WeatherAnimationFrameInterval
     };
 
     private readonly AppSettingsService _settingsService = new();
@@ -1112,7 +1112,9 @@ public partial class MultiDayWeatherWidget : UserControl, IDesktopComponentWidge
         var stackSpacing = Math.Clamp(2 * hourlyCellScale, 0.2, 10);
         var forecastRangeSize = Math.Clamp(18.0 * hourlyCellScale, 6, 62);
         var forecastLabelSize = Math.Clamp(13.8 * hourlyCellScale, 6, 48);
-        var forecastIconSize = Math.Clamp(32 * hourlyCellScale, 8, 100);
+        var forecastIconSize = Math.Clamp(40 * hourlyCellScale, 9, 124);
+        forecastIconSize = Math.Min(forecastIconSize, Math.Max(10, hourlyCellWidth * 0.88));
+        forecastIconSize = Math.Min(forecastIconSize, Math.Max(10, bottomZoneHeight * 0.50));
 
         for (var i = 0; i < _hourlyTimeBlocks.Length; i++)
         {

LanMountainDesktop/Views/Components/MusicControlWidget.axaml

@@ -86,7 +86,7 @@
                            Opacity="0.62"
                            Stretch="UniformToFill">
                         <Image.Effect>
-                            <BlurEffect Radius="{DynamicResource MotionBackdropBlurRadiusStrong}" />
+                            <BlurEffect Radius="{DynamicResource FluttermotionToken.BackdropBlurRadiusStrong}" />
                         </Image.Effect>
                     </Image>
                 </Border>

LanMountainDesktop/Views/Components/WeatherWidget.axaml.cs

@@ -84,7 +84,7 @@ public partial class WeatherWidget : UserControl, IDesktopComponentWidget, IDesk
 
     private readonly DispatcherTimer _backgroundAnimationTimer = new()
     {
-        Interval = UiMotionTokens.WeatherAnimationFrameInterval
+        Interval = FluttermotionToken.WeatherAnimationFrameInterval
     };
 
     private readonly AppSettingsService _settingsService = new();

LanMountainDesktop/Views/Components/WorldClockWidget.axaml

@@ -0,0 +1,21 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="420"
+             d:DesignHeight="210"
+             x:Class="LanMountainDesktop.Views.Components.WorldClockWidget">
+
+    <Border x:Name="RootBorder"
+            Background="#F4F5F7"
+            BorderBrush="#16000000"
+            BorderThickness="1"
+            CornerRadius="26"
+            ClipToBounds="True"
+            Padding="10,8">
+        <Grid x:Name="ClockHostGrid"
+              ColumnDefinitions="*,*,*,*"
+              ColumnSpacing="8" />
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/WorldClockWidget.axaml.cs

@@ -0,0 +1,671 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
+using Avalonia.Layout;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class WorldClockWidget : UserControl, IDesktopComponentWidget, ITimeZoneAwareComponentWidget
+{
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+    private const double BaseCellSize = 48;
+    private const double DialDesignSize = 100;
+    private const double DialCenter = DialDesignSize / 2d;
+
+    private static readonly FontFamily MiSansFontFamily =
+        new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+
+    private static readonly IReadOnlyDictionary<string, string> ZhCityNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "北京",
+            ["Asia/Shanghai"] = "北京",
+            ["GMT Standard Time"] = "伦敦",
+            ["Europe/London"] = "伦敦",
+            ["AUS Eastern Standard Time"] = "悉尼",
+            ["Australia/Sydney"] = "悉尼",
+            ["Eastern Standard Time"] = "纽约",
+            ["America/New_York"] = "纽约",
+            ["Tokyo Standard Time"] = "东京",
+            ["Asia/Tokyo"] = "东京",
+            ["UTC"] = "协调世界时",
+            ["Etc/UTC"] = "协调世界时"
+        };
+
+    private static readonly IReadOnlyDictionary<string, string> EnCityNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "Beijing",
+            ["Asia/Shanghai"] = "Beijing",
+            ["GMT Standard Time"] = "London",
+            ["Europe/London"] = "London",
+            ["AUS Eastern Standard Time"] = "Sydney",
+            ["Australia/Sydney"] = "Sydney",
+            ["Eastern Standard Time"] = "New York",
+            ["America/New_York"] = "New York",
+            ["Tokyo Standard Time"] = "Tokyo",
+            ["Asia/Tokyo"] = "Tokyo",
+            ["UTC"] = "UTC",
+            ["Etc/UTC"] = "UTC"
+        };
+
+    private sealed class ClockEntryVisual
+    {
+        public required StackPanel Host { get; init; }
+
+        public required Border DialBorder { get; init; }
+
+        public required Canvas TickCanvas { get; init; }
+
+        public required Canvas NumberCanvas { get; init; }
+
+        public required Line HourHand { get; init; }
+
+        public required Line MinuteHand { get; init; }
+
+        public required Line SecondHand { get; init; }
+
+        public required Ellipse CenterOuter { get; init; }
+
+        public required TextBlock CityTextBlock { get; init; }
+
+        public required TextBlock DayTextBlock { get; init; }
+
+        public required TextBlock OffsetTextBlock { get; init; }
+
+        public bool? IsNightApplied { get; set; }
+    }
+
+    private readonly DispatcherTimer _clockTimer = new()
+    {
+        Interval = TimeSpan.FromSeconds(1)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly ClockEntryVisual[] _entryVisuals = new ClockEntryVisual[WorldClockTimeZoneCatalog.ClockCount];
+    private readonly TimeZoneInfo[] _entryTimeZones = new TimeZoneInfo[WorldClockTimeZoneCatalog.ClockCount];
+
+    private TimeZoneService? _timeZoneService;
+    private string _languageCode = "zh-CN";
+    private double _currentCellSize = BaseCellSize;
+    private DateTime _nextLanguageProbeUtc = DateTime.MinValue;
+    private string _secondHandMode = ClockSecondHandMode.Tick;
+
+    public WorldClockWidget()
+    {
+        InitializeComponent();
+
+        BuildClockEntryVisuals();
+        LoadFromSettings();
+        ApplySecondHandTimerInterval();
+        ApplyCellSize(_currentCellSize);
+        UpdateClockVisuals();
+
+        _clockTimer.Tick += OnClockTimerTick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+    }
+
+    public void SetTimeZoneService(TimeZoneService timeZoneService)
+    {
+        ClearTimeZoneService();
+        _timeZoneService = timeZoneService;
+        _timeZoneService.TimeZoneChanged += OnTimeZoneChanged;
+        UpdateClockVisuals();
+    }
+
+    public void ClearTimeZoneService()
+    {
+        if (_timeZoneService is null)
+        {
+            return;
+        }
+
+        _timeZoneService.TimeZoneChanged -= OnTimeZoneChanged;
+        _timeZoneService = null;
+    }
+
+    public void RefreshFromSettings()
+    {
+        LoadFromSettings();
+        ApplySecondHandTimerInterval();
+        UpdateClockVisuals();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        var scale = ResolveScale();
+
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        var horizontalPadding = Math.Clamp(10 * scale, 4, 26);
+        var verticalPadding = Math.Clamp(8 * scale, 3, 22);
+        RootBorder.Padding = new Thickness(horizontalPadding, verticalPadding);
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(24 * scale, 10, 46));
+
+        var usableWidth = Math.Max(48, totalWidth - horizontalPadding * 2);
+        var usableHeight = Math.Max(28, totalHeight - verticalPadding * 2);
+
+        var columnSpacing = Math.Clamp(usableWidth * 0.015, 2, 14);
+        ClockHostGrid.ColumnSpacing = columnSpacing;
+        var widthPerClock = Math.Max(18, (usableWidth - columnSpacing * 3) / WorldClockTimeZoneCatalog.ClockCount);
+
+        var secondaryFont = Math.Clamp(10.5 * scale * (widthPerClock / 46d), 7, 18);
+        var cityFont = Math.Clamp(secondaryFont * 1.42, 9, 24);
+        var textSpacing = Math.Clamp(2.8 * scale, 1, 7);
+
+        var estimatedTextHeight = cityFont * 1.2 + secondaryFont * 2.35 + textSpacing * 3;
+        var dialSize = Math.Clamp(Math.Min(widthPerClock, usableHeight - estimatedTextHeight), 18, 108);
+        if (dialSize < 18)
+        {
+            dialSize = Math.Clamp(Math.Min(widthPerClock, usableHeight * 0.56), 16, 108);
+        }
+
+        foreach (var entry in _entryVisuals)
+        {
+            entry.Host.Spacing = textSpacing;
+            entry.DialBorder.Width = dialSize;
+            entry.DialBorder.Height = dialSize;
+            entry.DialBorder.CornerRadius = new CornerRadius(dialSize / 2d);
+
+            entry.CityTextBlock.FontSize = cityFont;
+            entry.DayTextBlock.FontSize = secondaryFont;
+            entry.OffsetTextBlock.FontSize = secondaryFont;
+
+            var maxTextWidth = Math.Max(16, widthPerClock + 10);
+            entry.CityTextBlock.MaxWidth = maxTextWidth;
+            entry.DayTextBlock.MaxWidth = maxTextWidth;
+            entry.OffsetTextBlock.MaxWidth = maxTextWidth;
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        LoadFromSettings();
+        ApplySecondHandTimerInterval();
+        UpdateClockVisuals();
+        _clockTimer.Start();
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _clockTimer.Stop();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private void OnTimeZoneChanged(object? sender, EventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        UpdateClockVisuals();
+    }
+
+    private void OnClockTimerTick(object? sender, EventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        UpdateClockVisuals();
+    }
+
+    private void BuildClockEntryVisuals()
+    {
+        ClockHostGrid.Children.Clear();
+        for (var index = 0; index < WorldClockTimeZoneCatalog.ClockCount; index++)
+        {
+            var entry = CreateClockEntryVisual();
+            _entryVisuals[index] = entry;
+            ClockHostGrid.Children.Add(entry.Host);
+            Grid.SetColumn(entry.Host, index);
+            Grid.SetRow(entry.Host, 0);
+        }
+    }
+
+    private ClockEntryVisual CreateClockEntryVisual()
+    {
+        var tickCanvas = new Canvas
+        {
+            Width = DialDesignSize,
+            Height = DialDesignSize,
+            IsHitTestVisible = false
+        };
+        var numberCanvas = new Canvas
+        {
+            Width = DialDesignSize,
+            Height = DialDesignSize,
+            IsHitTestVisible = false
+        };
+        var handsCanvas = new Canvas
+        {
+            Width = DialDesignSize,
+            Height = DialDesignSize,
+            IsHitTestVisible = false
+        };
+
+        var hourHand = CreateHandLine("#2B3242", 5.0);
+        var minuteHand = CreateHandLine("#40495E", 3.2);
+        var secondHand = CreateHandLine("#1A74F2", 2.2);
+        handsCanvas.Children.Add(hourHand);
+        handsCanvas.Children.Add(minuteHand);
+        handsCanvas.Children.Add(secondHand);
+
+        var centerOuter = new Ellipse
+        {
+            Width = 11,
+            Height = 11,
+            Fill = CreateBrush("#4F7BC0"),
+            HorizontalAlignment = HorizontalAlignment.Center,
+            VerticalAlignment = VerticalAlignment.Center
+        };
+        var centerInner = new Ellipse
+        {
+            Width = 4.5,
+            Height = 4.5,
+            Fill = CreateBrush("#1A74F2"),
+            HorizontalAlignment = HorizontalAlignment.Center,
+            VerticalAlignment = VerticalAlignment.Center
+        };
+
+        var dialRoot = new Grid
+        {
+            Width = DialDesignSize,
+            Height = DialDesignSize
+        };
+        dialRoot.Children.Add(tickCanvas);
+        dialRoot.Children.Add(numberCanvas);
+        dialRoot.Children.Add(handsCanvas);
+        dialRoot.Children.Add(centerOuter);
+        dialRoot.Children.Add(centerInner);
+
+        var dialBorder = new Border
+        {
+            Width = 56,
+            Height = 56,
+            CornerRadius = new CornerRadius(28),
+            BorderThickness = new Thickness(1),
+            Background = CreateBrush("#FAFBFD"),
+            BorderBrush = CreateBrush("#DADFE8"),
+            ClipToBounds = true,
+            Child = new Viewbox
+            {
+                Stretch = Stretch.Uniform,
+                Child = dialRoot
+            }
+        };
+
+        var cityTextBlock = new TextBlock
+        {
+            Text = string.Empty,
+            FontFamily = MiSansFontFamily,
+            FontSize = 13,
+            FontWeight = FontWeight.SemiBold,
+            Foreground = CreateBrush("#20232A"),
+            TextAlignment = TextAlignment.Center,
+            TextTrimming = TextTrimming.CharacterEllipsis,
+            TextWrapping = TextWrapping.NoWrap,
+            HorizontalAlignment = HorizontalAlignment.Center
+        };
+
+        var dayTextBlock = new TextBlock
+        {
+            Text = string.Empty,
+            FontFamily = MiSansFontFamily,
+            FontSize = 10.5,
+            FontWeight = FontWeight.Medium,
+            Foreground = CreateBrush("#646C79"),
+            TextAlignment = TextAlignment.Center,
+            TextTrimming = TextTrimming.CharacterEllipsis,
+            TextWrapping = TextWrapping.NoWrap,
+            HorizontalAlignment = HorizontalAlignment.Center
+        };
+
+        var offsetTextBlock = new TextBlock
+        {
+            Text = string.Empty,
+            FontFamily = MiSansFontFamily,
+            FontSize = 10.5,
+            FontWeight = FontWeight.Medium,
+            Foreground = CreateBrush("#7A7F89"),
+            TextAlignment = TextAlignment.Center,
+            TextTrimming = TextTrimming.CharacterEllipsis,
+            TextWrapping = TextWrapping.NoWrap,
+            HorizontalAlignment = HorizontalAlignment.Center
+        };
+
+        var host = new StackPanel
+        {
+            Orientation = Orientation.Vertical,
+            HorizontalAlignment = HorizontalAlignment.Center,
+            VerticalAlignment = VerticalAlignment.Center,
+            Spacing = 3,
+            Children =
+            {
+                dialBorder,
+                cityTextBlock,
+                dayTextBlock,
+                offsetTextBlock
+            }
+        };
+
+        var entry = new ClockEntryVisual
+        {
+            Host = host,
+            DialBorder = dialBorder,
+            TickCanvas = tickCanvas,
+            NumberCanvas = numberCanvas,
+            HourHand = hourHand,
+            MinuteHand = minuteHand,
+            SecondHand = secondHand,
+            CenterOuter = centerOuter,
+            CityTextBlock = cityTextBlock,
+            DayTextBlock = dayTextBlock,
+            OffsetTextBlock = offsetTextBlock
+        };
+
+        ApplyDialTheme(entry, isNight: false);
+        return entry;
+    }
+
+    private static void BuildDialTicks(ClockEntryVisual entry, bool isNight)
+    {
+        entry.TickCanvas.Children.Clear();
+        var majorColor = isNight ? "#E3E7F2" : "#2D3341";
+        var minorColor = isNight ? "#9EA7B8" : "#9AA4B3";
+
+        for (var i = 0; i < 60; i++)
+        {
+            var isMajor = i % 5 == 0;
+            var angle = (i * 6 - 90) * Math.PI / 180d;
+            var outerRadius = DialCenter - 6.5;
+            var innerRadius = outerRadius - (isMajor ? 9 : 4.5);
+
+            var x1 = DialCenter + Math.Cos(angle) * innerRadius;
+            var y1 = DialCenter + Math.Sin(angle) * innerRadius;
+            var x2 = DialCenter + Math.Cos(angle) * outerRadius;
+            var y2 = DialCenter + Math.Sin(angle) * outerRadius;
+
+            entry.TickCanvas.Children.Add(new Line
+            {
+                StartPoint = new Point(x1, y1),
+                EndPoint = new Point(x2, y2),
+                Stroke = CreateBrush(isMajor ? majorColor : minorColor),
+                StrokeThickness = isMajor ? 1.9 : 0.8,
+                StrokeLineCap = PenLineCap.Round
+            });
+        }
+    }
+
+    private static void BuildDialNumbers(ClockEntryVisual entry, bool isNight)
+    {
+        entry.NumberCanvas.Children.Clear();
+        var numberColor = isNight ? "#F2F5FB" : "#1B202A";
+        var radius = 36;
+        for (var number = 1; number <= 12; number++)
+        {
+            var angle = (number * 30 - 90) * Math.PI / 180d;
+            var x = DialCenter + Math.Cos(angle) * radius;
+            var y = DialCenter + Math.Sin(angle) * radius;
+            var text = number.ToString(CultureInfo.InvariantCulture);
+            var isDoubleDigit = number >= 10;
+            var width = isDoubleDigit ? 14 : 10;
+            var height = 12;
+            var numberText = new TextBlock
+            {
+                Text = text,
+                Width = width,
+                Height = height,
+                FontFamily = MiSansFontFamily,
+                FontSize = 9,
+                FontWeight = FontWeight.SemiBold,
+                Foreground = CreateBrush(numberColor),
+                TextAlignment = TextAlignment.Center
+            };
+
+            Canvas.SetLeft(numberText, x - width / 2d);
+            Canvas.SetTop(numberText, y - height / 2d);
+            entry.NumberCanvas.Children.Add(numberText);
+        }
+    }
+
+    private void LoadFromSettings()
+    {
+        var snapshot = _settingsService.Load();
+        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+
+        var ids = WorldClockTimeZoneCatalog.NormalizeTimeZoneIds(snapshot.WorldClockTimeZoneIds);
+        for (var index = 0; index < WorldClockTimeZoneCatalog.ClockCount; index++)
+        {
+            var resolvedId = ids[index];
+            _entryTimeZones[index] = WorldClockTimeZoneCatalog.ResolveTimeZoneOrLocal(resolvedId);
+        }
+
+        _secondHandMode = ClockSecondHandMode.Normalize(snapshot.WorldClockSecondHandMode);
+    }
+
+    private void ApplySecondHandTimerInterval()
+    {
+        _clockTimer.Interval = ClockSecondHandMode.IsSweep(_secondHandMode)
+            ? TimeSpan.FromMilliseconds(16)
+            : TimeSpan.FromSeconds(1);
+    }
+
+    private void UpdateClockVisuals()
+    {
+        var utcNow = DateTime.UtcNow;
+        ProbeLanguageCodeIfNeeded(utcNow);
+
+        var baseZone = _timeZoneService?.CurrentTimeZone ?? TimeZoneInfo.Local;
+        var baseNow = TimeZoneInfo.ConvertTimeFromUtc(utcNow, baseZone);
+        var baseOffset = baseZone.GetUtcOffset(utcNow);
+
+        for (var index = 0; index < WorldClockTimeZoneCatalog.ClockCount; index++)
+        {
+            var entry = _entryVisuals[index];
+            var zone = _entryTimeZones[index] ?? TimeZoneInfo.Local;
+            var zonedNow = TimeZoneInfo.ConvertTimeFromUtc(utcNow, zone);
+            var isNight = IsNightForLocalTime(zonedNow);
+            ApplyDialTheme(entry, isNight);
+
+            var secondValue = ClockSecondHandMode.IsSweep(_secondHandMode)
+                ? zonedNow.Second + zonedNow.Millisecond / 1000d
+                : zonedNow.Second;
+            var minuteValue = zonedNow.Minute + secondValue / 60d;
+            var hourValue = (zonedNow.Hour % 12) + minuteValue / 60d;
+
+            var hourAngle = hourValue * 30d;
+            var minuteAngle = minuteValue * 6d;
+            var secondAngle = secondValue * 6d;
+
+            SetHandGeometry(entry.HourHand, hourAngle, forwardLength: 24, backwardLength: 4.8);
+            SetHandGeometry(entry.MinuteHand, minuteAngle, forwardLength: 33, backwardLength: 6);
+            SetHandGeometry(entry.SecondHand, secondAngle, forwardLength: 37, backwardLength: 8.5);
+
+            entry.CityTextBlock.Text = ResolveCityName(zone);
+            entry.DayTextBlock.Text = ResolveRelativeDayLabel((zonedNow.Date - baseNow.Date).Days);
+
+            var offsetDelta = zone.GetUtcOffset(utcNow) - baseOffset;
+            entry.OffsetTextBlock.Text = ResolveOffsetLabel(offsetDelta);
+        }
+    }
+
+    private static void ApplyDialTheme(ClockEntryVisual entry, bool isNight)
+    {
+        if (entry.IsNightApplied.HasValue && entry.IsNightApplied.Value == isNight)
+        {
+            return;
+        }
+
+        entry.IsNightApplied = isNight;
+        entry.DialBorder.Background = CreateBrush(isNight ? "#2D313A" : "#FAFBFD");
+        entry.DialBorder.BorderBrush = CreateBrush(isNight ? "#262A33" : "#DADFE8");
+        entry.HourHand.Stroke = CreateBrush(isNight ? "#F5F8FF" : "#2B3242");
+        entry.MinuteHand.Stroke = CreateBrush(isNight ? "#DDE4F0" : "#40495E");
+        entry.SecondHand.Stroke = CreateBrush("#1A74F2");
+        entry.CenterOuter.Fill = CreateBrush(isNight ? "#97B4EA" : "#4F7BC0");
+
+        BuildDialTicks(entry, isNight);
+        BuildDialNumbers(entry, isNight);
+    }
+
+    private void ProbeLanguageCodeIfNeeded(DateTime utcNow)
+    {
+        if (utcNow < _nextLanguageProbeUtc)
+        {
+            return;
+        }
+
+        _nextLanguageProbeUtc = utcNow.AddSeconds(25);
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private string ResolveCityName(TimeZoneInfo timeZone)
+    {
+        var cityNames = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase)
+            ? ZhCityNames
+            : EnCityNames;
+        if (cityNames.TryGetValue(timeZone.Id, out var cityName))
+        {
+            return cityName;
+        }
+
+        var normalized = timeZone.Id;
+        var slashIndex = normalized.LastIndexOf('/');
+        if (slashIndex >= 0 && slashIndex < normalized.Length - 1)
+        {
+            normalized = normalized[(slashIndex + 1)..];
+        }
+
+        normalized = normalized.Replace('_', ' ').Trim();
+        normalized = normalized
+            .Replace("Standard Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Replace("Daylight Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Replace("Time", string.Empty, StringComparison.OrdinalIgnoreCase)
+            .Trim();
+
+        return string.IsNullOrWhiteSpace(normalized) ? timeZone.Id : normalized;
+    }
+
+    private string ResolveRelativeDayLabel(int dayDelta)
+    {
+        if (dayDelta < 0)
+        {
+            return L("worldclock.widget.yesterday", "昨天");
+        }
+
+        if (dayDelta > 0)
+        {
+            return L("worldclock.widget.tomorrow", "明天");
+        }
+
+        return L("worldclock.widget.today", "今天");
+    }
+
+    private string ResolveOffsetLabel(TimeSpan delta)
+    {
+        var totalMinutes = (int)Math.Round(delta.TotalMinutes);
+        if (totalMinutes == 0)
+        {
+            return L("worldclock.widget.offset_same", "0 小时");
+        }
+
+        var absMinutes = Math.Abs(totalMinutes);
+        var hours = absMinutes / 60;
+        var minutes = absMinutes % 60;
+        var isAhead = totalMinutes > 0;
+
+        if (minutes == 0)
+        {
+            return isAhead
+                ? Lf("worldclock.widget.offset_ahead_hours", "早 {0} 小时", hours)
+                : Lf("worldclock.widget.offset_behind_hours", "晚 {0} 小时", hours);
+        }
+
+        return isAhead
+            ? Lf("worldclock.widget.offset_ahead_hm", "早 {0} 小时 {1} 分", hours, minutes)
+            : Lf("worldclock.widget.offset_behind_hm", "晚 {0} 小时 {1} 分", hours, minutes);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private string Lf(string key, string fallback, params object[] args)
+    {
+        var template = L(key, fallback);
+        return string.Format(template, args);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.5);
+        var widthScale = Bounds.Width > 1
+            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.52, 2.4)
+            : 1;
+        var heightScale = Bounds.Height > 1
+            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.52, 2.4)
+            : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.50, 2.4);
+    }
+
+    private static bool IsNightForLocalTime(DateTime localTime)
+    {
+        var hour = localTime.Hour + localTime.Minute / 60d;
+        return hour < 6 || hour >= 18;
+    }
+
+    private static void SetHandGeometry(Line hand, double angleDeg, double forwardLength, double backwardLength)
+    {
+        var radians = (angleDeg - 90) * Math.PI / 180d;
+        var cos = Math.Cos(radians);
+        var sin = Math.Sin(radians);
+
+        hand.StartPoint = new Point(
+            DialCenter - cos * backwardLength,
+            DialCenter - sin * backwardLength);
+        hand.EndPoint = new Point(
+            DialCenter + cos * forwardLength,
+            DialCenter + sin * forwardLength);
+    }
+
+    private static Line CreateHandLine(string colorHex, double thickness)
+    {
+        return new Line
+        {
+            StartPoint = new Point(DialCenter, DialCenter),
+            EndPoint = new Point(DialCenter, DialCenter - 32),
+            Stroke = CreateBrush(colorHex),
+            StrokeThickness = thickness,
+            StrokeLineCap = PenLineCap.Round
+        };
+    }
+
+    private static IBrush CreateBrush(string colorHex)
+    {
+        return new SolidColorBrush(Color.Parse(colorHex));
+    }
+}

LanMountainDesktop/Views/Components/WorldClockWidgetSettingsWindow.axaml

@@ -0,0 +1,121 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="560"
+             d:DesignHeight="380"
+             x:Class="LanMountainDesktop.Views.Components.WorldClockWidgetSettingsWindow">
+    <Border Background="{DynamicResource AdaptiveBackgroundBrush}"
+            Padding="16">
+        <Grid RowDefinitions="Auto,Auto,*"
+              RowSpacing="10">
+            <TextBlock x:Name="TitleTextBlock"
+                       Text="世界时钟设置"
+                       FontSize="18"
+                       FontWeight="SemiBold"
+                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+            <TextBlock x:Name="DescriptionTextBlock"
+                       Grid.Row="1"
+                       Text="分别为四个时钟选择时区。"
+                       FontSize="12"
+                       TextWrapping="Wrap"
+                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+
+            <ScrollViewer Grid.Row="2"
+                          HorizontalScrollBarVisibility="Disabled"
+                          VerticalScrollBarVisibility="Auto">
+                <StackPanel Spacing="10"
+                            Margin="0,0,6,0">
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="SecondHandModeLabelTextBlock"
+                                       Text="秒针方式"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <StackPanel Orientation="Horizontal"
+                                        Spacing="12">
+                                <RadioButton x:Name="SecondHandTickRadioButton"
+                                             GroupName="world_clock_second_mode"
+                                             Content="跳针"
+                                             Checked="OnSecondHandModeChanged" />
+                                <RadioButton x:Name="SecondHandSweepRadioButton"
+                                             GroupName="world_clock_second_mode"
+                                             Content="扫针"
+                                             Checked="OnSecondHandModeChanged" />
+                            </StackPanel>
+                        </StackPanel>
+                    </Border>
+
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="ClockOneLabelTextBlock"
+                                       Text="时钟 1"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="ClockOneTimeZoneComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnTimeZoneSelectionChanged" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="ClockTwoLabelTextBlock"
+                                       Text="时钟 2"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="ClockTwoTimeZoneComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnTimeZoneSelectionChanged" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="ClockThreeLabelTextBlock"
+                                       Text="时钟 3"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="ClockThreeTimeZoneComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnTimeZoneSelectionChanged" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="ClockFourLabelTextBlock"
+                                       Text="时钟 4"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="ClockFourTimeZoneComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnTimeZoneSelectionChanged" />
+                        </StackPanel>
+                    </Border>
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/WorldClockWidgetSettingsWindow.axaml.cs

@@ -0,0 +1,244 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Interactivity;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class WorldClockWidgetSettingsWindow : UserControl
+{
+    private static readonly IReadOnlyDictionary<string, string> ZhTimeZoneNames =
+        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["China Standard Time"] = "中国标准时间",
+            ["Asia/Shanghai"] = "中国标准时间",
+            ["GMT Standard Time"] = "格林威治标准时间",
+            ["Europe/London"] = "格林威治标准时间",
+            ["AUS Eastern Standard Time"] = "澳大利亚东部标准时间",
+            ["Australia/Sydney"] = "澳大利亚东部标准时间",
+            ["Eastern Standard Time"] = "美国东部标准时间",
+            ["America/New_York"] = "美国东部标准时间",
+            ["Tokyo Standard Time"] = "日本标准时间",
+            ["Asia/Tokyo"] = "日本标准时间",
+            ["UTC"] = "协调世界时",
+            ["Etc/UTC"] = "协调世界时"
+        };
+
+    private readonly AppSettingsService _appSettingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly TimeZoneService _timeZoneService = new();
+    private readonly ComboBox[] _timeZoneComboBoxes;
+    private bool _suppressEvents;
+    private string _languageCode = "zh-CN";
+    private IReadOnlyList<TimeZoneInfo> _allTimeZones = Array.Empty<TimeZoneInfo>();
+    private IReadOnlyList<string> _selectedTimeZoneIds = Array.Empty<string>();
+    private string _secondHandMode = ClockSecondHandMode.Tick;
+
+    public event EventHandler? SettingsChanged;
+
+    public WorldClockWidgetSettingsWindow()
+    {
+        InitializeComponent();
+
+        _timeZoneComboBoxes =
+        [
+            ClockOneTimeZoneComboBox,
+            ClockTwoTimeZoneComboBox,
+            ClockThreeTimeZoneComboBox,
+            ClockFourTimeZoneComboBox
+        ];
+
+        LoadState();
+        ApplyLocalization();
+        PopulateTimeZoneComboBoxes();
+    }
+
+    private void LoadState()
+    {
+        var snapshot = _appSettingsService.Load();
+        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+
+        _allTimeZones = _timeZoneService
+            .GetAllTimeZones()
+            .OrderBy(zone => zone.GetUtcOffset(DateTime.UtcNow))
+            .ThenBy(zone => zone.DisplayName, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+
+        _selectedTimeZoneIds = WorldClockTimeZoneCatalog.NormalizeTimeZoneIds(
+            snapshot.WorldClockTimeZoneIds,
+            _allTimeZones);
+        _secondHandMode = ClockSecondHandMode.Normalize(snapshot.WorldClockSecondHandMode);
+    }
+
+    private void ApplyLocalization()
+    {
+        TitleTextBlock.Text = L("worldclock.settings.title", "世界时钟设置");
+        DescriptionTextBlock.Text = L("worldclock.settings.desc", "分别为四个时钟选择时区。");
+
+        ClockOneLabelTextBlock.Text = L("worldclock.settings.clock_1", "时钟 1");
+        ClockTwoLabelTextBlock.Text = L("worldclock.settings.clock_2", "时钟 2");
+        ClockThreeLabelTextBlock.Text = L("worldclock.settings.clock_3", "时钟 3");
+        ClockFourLabelTextBlock.Text = L("worldclock.settings.clock_4", "时钟 4");
+        SecondHandModeLabelTextBlock.Text = L("worldclock.settings.second_mode_label", "秒针方式");
+        SecondHandTickRadioButton.Content = L("clock.second_mode.tick", "跳针");
+        SecondHandSweepRadioButton.Content = L("clock.second_mode.sweep", "扫针");
+    }
+
+    private void PopulateTimeZoneComboBoxes()
+    {
+        _suppressEvents = true;
+        try
+        {
+            foreach (var comboBox in _timeZoneComboBoxes)
+            {
+                comboBox.Items.Clear();
+                foreach (var timeZone in _allTimeZones)
+                {
+                    comboBox.Items.Add(new ComboBoxItem
+                    {
+                        Tag = timeZone.Id,
+                        Content = GetLocalizedTimeZoneDisplayName(timeZone)
+                    });
+                }
+            }
+
+            for (var index = 0; index < _timeZoneComboBoxes.Length; index++)
+            {
+                var comboBox = _timeZoneComboBoxes[index];
+                var targetId = index < _selectedTimeZoneIds.Count
+                    ? _selectedTimeZoneIds[index]
+                    : TimeZoneInfo.Local.Id;
+
+                var selected = comboBox.Items
+                    .OfType<ComboBoxItem>()
+                    .FirstOrDefault(item => string.Equals(item.Tag as string, targetId, StringComparison.OrdinalIgnoreCase));
+
+                comboBox.SelectedItem = selected ?? comboBox.Items.OfType<ComboBoxItem>().FirstOrDefault();
+            }
+
+            var normalizedMode = ClockSecondHandMode.Normalize(_secondHandMode);
+            SecondHandTickRadioButton.IsChecked = string.Equals(
+                normalizedMode,
+                ClockSecondHandMode.Tick,
+                StringComparison.OrdinalIgnoreCase);
+            SecondHandSweepRadioButton.IsChecked = string.Equals(
+                normalizedMode,
+                ClockSecondHandMode.Sweep,
+                StringComparison.OrdinalIgnoreCase);
+        }
+        finally
+        {
+            _suppressEvents = false;
+        }
+    }
+
+    private void OnTimeZoneSelectionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        SaveState();
+    }
+
+    private void OnSecondHandModeChanged(object? sender, RoutedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        SaveState();
+    }
+
+    private void SaveState()
+    {
+        var selectedIds = GetSelectedTimeZoneIds();
+        var normalizedIds = WorldClockTimeZoneCatalog.NormalizeTimeZoneIds(selectedIds, _allTimeZones);
+        _secondHandMode = GetSelectedSecondHandMode();
+
+        var snapshot = _appSettingsService.Load();
+        snapshot.WorldClockTimeZoneIds = normalizedIds.ToList();
+        snapshot.WorldClockSecondHandMode = _secondHandMode;
+        _appSettingsService.Save(snapshot);
+
+        _selectedTimeZoneIds = normalizedIds;
+        SettingsChanged?.Invoke(this, EventArgs.Empty);
+    }
+
+    private string GetSelectedSecondHandMode()
+    {
+        return SecondHandSweepRadioButton.IsChecked == true
+            ? ClockSecondHandMode.Sweep
+            : ClockSecondHandMode.Tick;
+    }
+
+    private List<string> GetSelectedTimeZoneIds()
+    {
+        var selectedIds = new List<string>(_timeZoneComboBoxes.Length);
+        foreach (var comboBox in _timeZoneComboBoxes)
+        {
+            if (comboBox.SelectedItem is ComboBoxItem item &&
+                item.Tag is string timeZoneId &&
+                !string.IsNullOrWhiteSpace(timeZoneId))
+            {
+                selectedIds.Add(timeZoneId.Trim());
+                continue;
+            }
+
+            selectedIds.Add(TimeZoneInfo.Local.Id);
+        }
+
+        return selectedIds;
+    }
+
+    private string GetLocalizedTimeZoneDisplayName(TimeZoneInfo timeZone)
+    {
+        var offset = timeZone.GetUtcOffset(DateTime.UtcNow);
+        var sign = offset >= TimeSpan.Zero ? "+" : "-";
+        var totalMinutes = Math.Abs((int)offset.TotalMinutes);
+        var hours = totalMinutes / 60;
+        var minutes = totalMinutes % 60;
+
+        var displayName = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase)
+            ? ResolveZhDisplayName(timeZone)
+            : ResolveEnDisplayName(timeZone);
+
+        return $"(UTC{sign}{hours:D2}:{minutes:D2}) {displayName}";
+    }
+
+    private static string ResolveZhDisplayName(TimeZoneInfo timeZone)
+    {
+        if (ZhTimeZoneNames.TryGetValue(timeZone.Id, out var localizedName))
+        {
+            return localizedName;
+        }
+
+        return string.IsNullOrWhiteSpace(timeZone.StandardName)
+            ? timeZone.DisplayName
+            : timeZone.StandardName;
+    }
+
+    private static string ResolveEnDisplayName(TimeZoneInfo timeZone)
+    {
+        if (!string.IsNullOrWhiteSpace(timeZone.StandardName))
+        {
+            return timeZone.StandardName;
+        }
+
+        return timeZone.DisplayName;
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+}

LanMountainDesktop/Views/MainWindow.ComponentSystem.cs

@@ -409,7 +409,7 @@ public partial class MainWindow
             {
                 OpenSettingsPage();
             }
-        }, UiMotionTokens.Slow);
+        }, FluttermotionToken.Slow);
     }
 
     private void InitializeDesktopComponentDragHandlers()
@@ -701,12 +701,24 @@ public partial class MainWindow
             return;
         }
 
+        if (placement.ComponentId == BuiltInComponentIds.DesktopClock)
+        {
+            OpenDesktopClockComponentSettings();
+            return;
+        }
+
         if (placement.ComponentId == BuiltInComponentIds.DesktopClassSchedule)
         {
             OpenClassScheduleComponentSettings();
             return;
         }
 
+        if (placement.ComponentId == BuiltInComponentIds.DesktopWorldClock)
+        {
+            OpenWorldClockComponentSettings();
+            return;
+        }
+
         if (placement.ComponentId == BuiltInComponentIds.DesktopDailyArtwork)
         {
             OpenDailyArtworkComponentSettings();
@@ -751,6 +763,38 @@ public partial class MainWindow
         ComponentSettingsWindow.Opacity = 1;
     }
 
+    private void OpenDesktopClockComponentSettings()
+    {
+        if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
+        {
+            return;
+        }
+
+        var settingsContent = new AnalogClockWidgetSettingsWindow();
+        settingsContent.SettingsChanged += OnDesktopClockSettingsChanged;
+        ComponentSettingsContentHost.Content = settingsContent;
+
+        ComponentSettingsWindow.IsVisible = true;
+        ComponentSettingsWindow.Opacity = 0;
+        ComponentSettingsWindow.Opacity = 1;
+    }
+
+    private void OpenWorldClockComponentSettings()
+    {
+        if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
+        {
+            return;
+        }
+
+        var settingsContent = new WorldClockWidgetSettingsWindow();
+        settingsContent.SettingsChanged += OnWorldClockSettingsChanged;
+        ComponentSettingsContentHost.Content = settingsContent;
+
+        ComponentSettingsWindow.IsVisible = true;
+        ComponentSettingsWindow.Opacity = 0;
+        ComponentSettingsWindow.Opacity = 1;
+    }
+
     private void OpenStudyEnvironmentComponentSettings()
     {
         if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
@@ -796,6 +840,30 @@ public partial class MainWindow
         }
     }
 
+    private void OnDesktopClockSettingsChanged(object? sender, EventArgs e)
+    {
+        _ = sender;
+        _ = e;
+
+        foreach (var pageGrid in _desktopPageComponentGrids.Values)
+        {
+            foreach (var host in pageGrid.Children.OfType<Border>())
+            {
+                if (!host.Classes.Contains(DesktopComponentHostClass))
+                {
+                    continue;
+                }
+
+                if (TryGetContentHost(host)?.Child is AnalogClockWidget widget)
+                {
+                    widget.RefreshFromSettings();
+                }
+            }
+        }
+
+        PersistSettings();
+    }
+
     private void OnStudyEnvironmentSettingsChanged(object? sender, EventArgs e)
     {
         _ = sender;
@@ -839,6 +907,30 @@ public partial class MainWindow
         PersistSettings();
     }
 
+    private void OnWorldClockSettingsChanged(object? sender, EventArgs e)
+    {
+        _ = sender;
+        _ = e;
+
+        foreach (var pageGrid in _desktopPageComponentGrids.Values)
+        {
+            foreach (var host in pageGrid.Children.OfType<Border>())
+            {
+                if (!host.Classes.Contains(DesktopComponentHostClass))
+                {
+                    continue;
+                }
+
+                if (TryGetContentHost(host)?.Child is WorldClockWidget widget)
+                {
+                    widget.RefreshFromSettings();
+                }
+            }
+        }
+
+        PersistSettings();
+    }
+
     private void CloseComponentSettingsWindow()
     {
         if (ComponentSettingsWindow is null)
@@ -851,6 +943,11 @@ public partial class MainWindow
             classScheduleSettingsWindow.SettingsChanged -= OnClassScheduleSettingsChanged;
         }
 
+        if (ComponentSettingsContentHost?.Content is AnalogClockWidgetSettingsWindow analogClockSettingsWindow)
+        {
+            analogClockSettingsWindow.SettingsChanged -= OnDesktopClockSettingsChanged;
+        }
+
         if (ComponentSettingsContentHost?.Content is StudyEnvironmentWidgetSettingsWindow studyEnvironmentSettingsWindow)
         {
             studyEnvironmentSettingsWindow.SettingsChanged -= OnStudyEnvironmentSettingsChanged;
@@ -861,6 +958,11 @@ public partial class MainWindow
             dailyArtworkSettingsWindow.SettingsChanged -= OnDailyArtworkSettingsChanged;
         }
 
+        if (ComponentSettingsContentHost?.Content is WorldClockWidgetSettingsWindow worldClockSettingsWindow)
+        {
+            worldClockSettingsWindow.SettingsChanged -= OnWorldClockSettingsChanged;
+        }
+
         ComponentSettingsWindow.Opacity = 0;
         
         DispatcherTimer.RunOnce(() =>
@@ -873,7 +975,7 @@ public partial class MainWindow
             {
                 ComponentSettingsContentHost.Content = null;
             }
-        }, UiMotionTokens.Slow);
+        }, FluttermotionToken.Slow);
     }
 
     private void AddDesktopPage()
@@ -1272,6 +1374,14 @@ public partial class MainWindow
                 new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
         }
 
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopWorldClock, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep world clock widget at 2:1 ratio: 4x2, 6x3, 8x4...
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
+        }
+
         if (string.Equals(componentId, BuiltInComponentIds.DesktopStudyScoreOverview, StringComparison.OrdinalIgnoreCase))
         {
             // Keep score overview widget square: 4x4, 5x5, 6x6...

LanMountainDesktop/Views/MainWindow.Localization.cs

@@ -110,6 +110,7 @@ public partial class MainWindow
         SettingsNavStatusBarTextBlock.Text = L("settings.nav.status_bar", "Status Bar");
         SettingsNavWeatherTextBlock.Text = L("settings.nav.weather", "Weather");
         SettingsNavRegionTextBlock.Text = L("settings.nav.region", "Region");
+        SettingsNavUpdateTextBlock.Text = L("settings.nav.update", "Update");
 
         WallpaperPanelTitleTextBlock.Text = L("settings.wallpaper.title", "Personalize your wallpaper");
         WallpaperPlacementSettingsExpander.Header = L("settings.wallpaper.placement_label", "Placement");
@@ -248,6 +249,8 @@ public partial class MainWindow
             "settings.region.timezone_desc",
             "Select a time zone. Clock and calendar widgets will follow this zone.");
 
+        ApplyUpdateLocalization();
+
         SettingsNavAboutTextBlock.Text = L("settings.nav.about", "About");
         AboutPanelTitleTextBlock.Text = L("settings.about.title", "About");
         VersionTextBlock.Text = Lf(

LanMountainDesktop/Views/MainWindow.Settings.cs

@@ -8,6 +8,7 @@ using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Threading;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
@@ -64,6 +65,7 @@ public partial class MainWindow
             StatusBarSettingsPanel is null ||
             WeatherSettingsPanel is null ||
             RegionSettingsPanel is null ||
+            UpdateSettingsPanel is null ||
             AboutSettingsPanel is null)
         {
             return;
@@ -76,7 +78,8 @@ public partial class MainWindow
         StatusBarSettingsPanel.IsVisible = selectedIndex == 3;
         WeatherSettingsPanel.IsVisible = selectedIndex == 4;
         RegionSettingsPanel.IsVisible = selectedIndex == 5;
-        AboutSettingsPanel.IsVisible = selectedIndex == 6;
+        UpdateSettingsPanel.IsVisible = selectedIndex == 6;
+        AboutSettingsPanel.IsVisible = selectedIndex == 7;
 
         if (selectedIndex == 1)
         {
@@ -547,10 +550,12 @@ public partial class MainWindow
         Core.Initialize();
         _libVlc ??= new LibVLC("--quiet");
 
-        if (_videoWallpaperPlayer is null && DesktopVideoWallpaperView is not null)
+        if (_videoWallpaperPlayer is null)
         {
-            _videoWallpaperPlayer = new MediaPlayer(_libVlc);
-            DesktopVideoWallpaperView.MediaPlayer = _videoWallpaperPlayer;
+            _videoWallpaperPlayer = new MediaPlayer(_libVlc)
+            {
+                EnableHardwareDecoding = false
+            };
         }
 
         if (_previewVideoWallpaperPlayer is null && WallpaperPreviewVideoView is not null)
@@ -560,6 +565,212 @@ public partial class MainWindow
         }
     }
 
+    private bool ConfigureDesktopVideoRenderer()
+    {
+        if (_videoWallpaperPlayer is null || DesktopVideoWallpaperImage is null)
+        {
+            return false;
+        }
+
+        var (targetWidth, targetHeight) = GetDesktopVideoRenderSize();
+        var targetPitch = targetWidth * 4;
+        var targetBufferSize = targetPitch * targetHeight;
+        if (targetBufferSize <= 0)
+        {
+            return false;
+        }
+
+        if (targetWidth == _desktopVideoFrameWidth &&
+            targetHeight == _desktopVideoFrameHeight &&
+            _desktopVideoFrameBufferPtr != IntPtr.Zero &&
+            _desktopVideoBitmap is not null)
+        {
+            return true;
+        }
+
+        ReleaseDesktopVideoRendererResources();
+
+        try
+        {
+            _desktopVideoFrameWidth = targetWidth;
+            _desktopVideoFrameHeight = targetHeight;
+            _desktopVideoFramePitch = targetPitch;
+            _desktopVideoFrameBufferSize = targetBufferSize;
+            _desktopVideoFrameBufferPtr = Marshal.AllocHGlobal(_desktopVideoFrameBufferSize);
+            _desktopVideoStagingBuffer = new byte[_desktopVideoFrameBufferSize];
+            _desktopVideoBitmap = new WriteableBitmap(
+                new PixelSize(_desktopVideoFrameWidth, _desktopVideoFrameHeight),
+                new Vector(96, 96),
+                PixelFormat.Bgra8888,
+                AlphaFormat.Opaque);
+            EnsureDesktopVideoCallbacks();
+            _videoWallpaperPlayer.SetVideoCallbacks(
+                _desktopVideoLockCallback!,
+                _desktopVideoUnlockCallback!,
+                _desktopVideoDisplayCallback!);
+            _videoWallpaperPlayer.SetVideoFormat(
+                "RV32",
+                (uint)_desktopVideoFrameWidth,
+                (uint)_desktopVideoFrameHeight,
+                (uint)_desktopVideoFramePitch);
+            DesktopVideoWallpaperImage.Source = _desktopVideoBitmap;
+            return true;
+        }
+        catch
+        {
+            ReleaseDesktopVideoRendererResources();
+            return false;
+        }
+    }
+
+    private (int Width, int Height) GetDesktopVideoRenderSize()
+    {
+        var hostWidth = DesktopHost?.Bounds.Width ?? Bounds.Width;
+        var hostHeight = DesktopHost?.Bounds.Height ?? Bounds.Height;
+        var pixelWidth = Math.Max(1, (int)Math.Round(hostWidth * RenderScaling));
+        var pixelHeight = Math.Max(1, (int)Math.Round(hostHeight * RenderScaling));
+
+        const int maxPixelCount = 1920 * 1080;
+        var pixelCount = (long)pixelWidth * pixelHeight;
+        if (pixelCount > maxPixelCount)
+        {
+            var scale = Math.Sqrt((double)maxPixelCount / pixelCount);
+            pixelWidth = Math.Max(1, (int)Math.Round(pixelWidth * scale));
+            pixelHeight = Math.Max(1, (int)Math.Round(pixelHeight * scale));
+        }
+
+        return (pixelWidth, pixelHeight);
+    }
+
+    private void EnsureDesktopVideoCallbacks()
+    {
+        _desktopVideoLockCallback ??= OnDesktopVideoFrameLock;
+        _desktopVideoUnlockCallback ??= OnDesktopVideoFrameUnlock;
+        _desktopVideoDisplayCallback ??= OnDesktopVideoFrameDisplay;
+    }
+
+    private IntPtr OnDesktopVideoFrameLock(IntPtr opaque, IntPtr planes)
+    {
+        Monitor.Enter(_desktopVideoFrameSync);
+        if (_desktopVideoFrameBufferPtr == IntPtr.Zero)
+        {
+            Marshal.WriteIntPtr(planes, IntPtr.Zero);
+            Monitor.Exit(_desktopVideoFrameSync);
+            return IntPtr.Zero;
+        }
+
+        Marshal.WriteIntPtr(planes, _desktopVideoFrameBufferPtr);
+        return IntPtr.Zero;
+    }
+
+    private void OnDesktopVideoFrameUnlock(IntPtr opaque, IntPtr picture, IntPtr planes)
+    {
+        if (Monitor.IsEntered(_desktopVideoFrameSync))
+        {
+            Monitor.Exit(_desktopVideoFrameSync);
+        }
+    }
+
+    private void OnDesktopVideoFrameDisplay(IntPtr opaque, IntPtr picture)
+    {
+        Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 1);
+        ScheduleDesktopVideoFrameUiRefresh();
+    }
+
+    private void ScheduleDesktopVideoFrameUiRefresh()
+    {
+        if (Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 1) == 1)
+        {
+            return;
+        }
+
+        Dispatcher.UIThread.Post(() =>
+        {
+            try
+            {
+                PushDesktopVideoFrameToWallpaperImage();
+            }
+            finally
+            {
+                Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 0);
+                if (Volatile.Read(ref _desktopVideoFrameDirtyFlag) == 1)
+                {
+                    ScheduleDesktopVideoFrameUiRefresh();
+                }
+            }
+        }, DispatcherPriority.Render);
+    }
+
+    private void PushDesktopVideoFrameToWallpaperImage()
+    {
+        if (Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 0) == 0)
+        {
+            return;
+        }
+
+        if (_desktopVideoBitmap is null ||
+            _desktopVideoStagingBuffer is null ||
+            _desktopVideoFrameBufferPtr == IntPtr.Zero ||
+            _desktopVideoFrameBufferSize <= 0)
+        {
+            return;
+        }
+
+        lock (_desktopVideoFrameSync)
+        {
+            if (_desktopVideoFrameBufferPtr == IntPtr.Zero)
+            {
+                return;
+            }
+
+            Marshal.Copy(_desktopVideoFrameBufferPtr, _desktopVideoStagingBuffer, 0, _desktopVideoFrameBufferSize);
+        }
+
+        using var framebuffer = _desktopVideoBitmap.Lock();
+        var rows = Math.Min(framebuffer.Size.Height, _desktopVideoFrameHeight);
+        var bytesPerRow = Math.Min(framebuffer.RowBytes, _desktopVideoFramePitch);
+        for (var row = 0; row < rows; row++)
+        {
+            var sourceOffset = row * _desktopVideoFramePitch;
+            var destinationPtr = IntPtr.Add(framebuffer.Address, row * framebuffer.RowBytes);
+            Marshal.Copy(_desktopVideoStagingBuffer, sourceOffset, destinationPtr, bytesPerRow);
+        }
+
+        if (DesktopVideoWallpaperImage is not null &&
+            !ReferenceEquals(DesktopVideoWallpaperImage.Source, _desktopVideoBitmap))
+        {
+            DesktopVideoWallpaperImage.Source = _desktopVideoBitmap;
+        }
+    }
+
+    private void ReleaseDesktopVideoRendererResources()
+    {
+        Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 0);
+        Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 0);
+
+        if (DesktopVideoWallpaperImage is not null)
+        {
+            DesktopVideoWallpaperImage.Source = null;
+        }
+
+        _desktopVideoBitmap?.Dispose();
+        _desktopVideoBitmap = null;
+        _desktopVideoStagingBuffer = null;
+        _desktopVideoFrameWidth = 0;
+        _desktopVideoFrameHeight = 0;
+        _desktopVideoFramePitch = 0;
+        _desktopVideoFrameBufferSize = 0;
+
+        lock (_desktopVideoFrameSync)
+        {
+            if (_desktopVideoFrameBufferPtr != IntPtr.Zero)
+            {
+                Marshal.FreeHGlobal(_desktopVideoFrameBufferPtr);
+                _desktopVideoFrameBufferPtr = IntPtr.Zero;
+            }
+        }
+    }
+
     private void PlayVideoWallpaper(string videoPath)
     {
         if (!File.Exists(videoPath))
@@ -575,7 +786,7 @@ public partial class MainWindow
             if (_videoWallpaperPlayer is null ||
                 _previewVideoWallpaperPlayer is null ||
                 _libVlc is null ||
-                DesktopVideoWallpaperView is null ||
+                DesktopVideoWallpaperImage is null ||
                 WallpaperPreviewVideoView is null)
             {
                 _wallpaperStatus = L("settings.wallpaper.video_player_unavailable", "Video player is unavailable.");
@@ -583,6 +794,13 @@ public partial class MainWindow
                 return;
             }
 
+            if (!ConfigureDesktopVideoRenderer())
+            {
+                _wallpaperStatus = L("settings.wallpaper.video_player_unavailable", "Video player is unavailable.");
+                StopVideoWallpaper();
+                return;
+            }
+
             _videoWallpaperMedia?.Dispose();
             _previewVideoWallpaperMedia?.Dispose();
             _videoWallpaperMedia = new Media(_libVlc, new Uri(videoPath));
@@ -591,7 +809,7 @@ public partial class MainWindow
             _previewVideoWallpaperMedia.AddOption(":input-repeat=65535");
             _videoWallpaperPlayer.Play(_videoWallpaperMedia);
             _previewVideoWallpaperPlayer.Play(_previewVideoWallpaperMedia);
-            DesktopVideoWallpaperView.IsVisible = true;
+            DesktopVideoWallpaperImage.IsVisible = true;
             WallpaperPreviewVideoView.IsVisible = true;
         }
         catch (Exception ex)
@@ -603,9 +821,9 @@ public partial class MainWindow
 
     private void StopVideoWallpaper()
     {
-        if (DesktopVideoWallpaperView is not null)
+        if (DesktopVideoWallpaperImage is not null)
         {
-            DesktopVideoWallpaperView.IsVisible = false;
+            DesktopVideoWallpaperImage.IsVisible = false;
         }
 
         if (WallpaperPreviewVideoView is not null)
@@ -613,16 +831,17 @@ public partial class MainWindow
             WallpaperPreviewVideoView.IsVisible = false;
         }
 
-        if (_videoWallpaperPlayer?.IsPlaying == true)
+        if (_videoWallpaperPlayer is not null)
         {
             _videoWallpaperPlayer.Stop();
         }
 
-        if (_previewVideoWallpaperPlayer?.IsPlaying == true)
+        if (_previewVideoWallpaperPlayer is not null)
         {
             _previewVideoWallpaperPlayer.Stop();
         }
 
+        ReleaseDesktopVideoRendererResources();
         _videoWallpaperMedia?.Dispose();
         _videoWallpaperMedia = null;
         _previewVideoWallpaperMedia?.Dispose();
@@ -660,6 +879,9 @@ public partial class MainWindow
             WeatherNoTlsRequests = _weatherNoTlsRequests,
             DailyArtworkMirrorSource = DailyArtworkMirrorSources.Normalize(_dailyArtworkMirrorSource),
             AutoStartWithWindows = _autoStartWithWindows,
+            AutoCheckUpdates = _autoCheckUpdates,
+            IncludePrereleaseUpdates = IncludePrereleaseUpdates,
+            UpdateChannel = IncludePrereleaseUpdates ? "Preview" : "Stable",
             TopStatusComponentIds = _topStatusComponentIds.ToList(),
             PinnedTaskbarActions = _pinnedTaskbarActions.Select(action => action.ToString()).ToList(),
             EnableDynamicTaskbarActions = _enableDynamicTaskbarActions,
@@ -2012,6 +2234,24 @@ public partial class MainWindow
             };
         }
 
+        if (UpdateOptionsSettingsExpander is not null)
+        {
+            UpdateOptionsSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
+            {
+                Symbol = Symbol.ArrowClockwiseDashesSettings,
+                IconVariant = variant
+            };
+        }
+
+        if (UpdateActionsSettingsExpander is not null)
+        {
+            UpdateActionsSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
+            {
+                Symbol = Symbol.ArrowDownload,
+                IconVariant = variant
+            };
+        }
+
         if (AboutStartupSettingsExpander is not null)
         {
             AboutStartupSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource

LanMountainDesktop/Views/MainWindow.Update.cs

@@ -0,0 +1,482 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views;
+
+public partial class MainWindow
+{
+    private const string UpdateChannelStable = "Stable";
+    private const string UpdateChannelPreview = "Preview";
+
+    private bool _autoCheckUpdates = true;
+    private string _updateChannel = UpdateChannelStable;
+    private bool _suppressUpdateOptionEvents;
+    private bool _isCheckingUpdates;
+    private bool _isDownloadingUpdate;
+    private string _latestReleaseVersionText = "-";
+    private DateTimeOffset? _latestReleasePublishedAt;
+    private string _updateStatusText = string.Empty;
+    private string _updateDownloadProgressText = string.Empty;
+    private double _updateDownloadProgressPercent;
+    private GitHubReleaseAsset? _latestReleaseInstallerAsset;
+    private string? _downloadedUpdateInstallerPath;
+
+    private bool IncludePrereleaseUpdates => string.Equals(
+        _updateChannel,
+        UpdateChannelPreview,
+        StringComparison.OrdinalIgnoreCase);
+
+    private void InitializeUpdateSettings(AppSettingsSnapshot snapshot)
+    {
+        _autoCheckUpdates = snapshot.AutoCheckUpdates;
+        _updateChannel = NormalizeUpdateChannel(snapshot.UpdateChannel, snapshot.IncludePrereleaseUpdates);
+        _latestReleaseVersionText = "-";
+        _latestReleasePublishedAt = null;
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        _updateStatusText = L("settings.update.status_ready", "Ready to check for updates.");
+        _latestReleaseInstallerAsset = null;
+        _downloadedUpdateInstallerPath = null;
+
+        _suppressUpdateOptionEvents = true;
+        try
+        {
+            if (AutoCheckUpdatesToggleSwitch is not null)
+            {
+                AutoCheckUpdatesToggleSwitch.IsChecked = _autoCheckUpdates;
+            }
+
+            if (UpdateChannelChipListBox is not null)
+            {
+                UpdateChannelChipListBox.SelectedIndex = IncludePrereleaseUpdates ? 1 : 0;
+            }
+        }
+        finally
+        {
+            _suppressUpdateOptionEvents = false;
+        }
+
+        UpdateUpdatePanelState();
+    }
+
+    private void TriggerAutoUpdateCheckIfEnabled()
+    {
+        if (!_autoCheckUpdates)
+        {
+            return;
+        }
+
+        _ = CheckForUpdatesAsync(silentWhenNoUpdate: true);
+    }
+
+    private void ApplyUpdateLocalization()
+    {
+        SettingsNavUpdateTextBlock.Text = L("settings.nav.update", "Update");
+        UpdatePanelTitleTextBlock.Text = L("settings.update.title", "Update");
+
+        UpdateCurrentVersionLabelTextBlock.Text = L("settings.update.current_version_label", "Current Version");
+        UpdateLatestVersionLabelTextBlock.Text = L("settings.update.latest_version_label", "Latest Release");
+        UpdatePublishedAtLabelTextBlock.Text = L("settings.update.published_at_label", "Published At");
+
+        UpdateOptionsSettingsExpander.Header = L("settings.update.options_header", "Update Options");
+        UpdateOptionsSettingsExpander.Description = L(
+            "settings.update.options_desc",
+            "Configure update checks and release channel.");
+
+        AutoCheckUpdatesToggleSwitch.Content = L(
+            "settings.update.auto_check_toggle",
+            "Automatically check for updates on startup");
+        UpdateChannelLabelTextBlock.Text = L(
+            "settings.update.channel_label",
+            "Update Channel");
+        UpdateChannelStableChipItem.Content = L(
+            "settings.update.channel_stable",
+            "Stable");
+        UpdateChannelPreviewChipItem.Content = L(
+            "settings.update.channel_preview",
+            "Preview");
+
+        UpdateActionsSettingsExpander.Header = L("settings.update.actions_header", "Update Actions");
+        UpdateActionsSettingsExpander.Description = L(
+            "settings.update.actions_desc",
+            "Check releases, download installer, and start update.");
+
+        CheckForUpdatesButton.Content = L("settings.update.check_button", "Check for Updates");
+        DownloadAndInstallUpdateButton.Content = L("settings.update.download_install_button", "Download & Install");
+
+        if (string.IsNullOrWhiteSpace(_updateDownloadProgressText))
+        {
+            _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        }
+
+        if (string.IsNullOrWhiteSpace(_updateStatusText))
+        {
+            _updateStatusText = L("settings.update.status_ready", "Ready to check for updates.");
+        }
+
+        UpdateUpdatePanelState();
+    }
+
+    private async void OnCheckForUpdatesClick(object? sender, RoutedEventArgs e)
+    {
+        await CheckForUpdatesAsync(silentWhenNoUpdate: false);
+    }
+
+    private async void OnDownloadAndInstallUpdateClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        if (_latestReleaseInstallerAsset is null)
+        {
+            await CheckForUpdatesAsync(silentWhenNoUpdate: false);
+        }
+
+        if (_latestReleaseInstallerAsset is null)
+        {
+            return;
+        }
+
+        await DownloadAndInstallUpdateAsync(_latestReleaseInstallerAsset);
+    }
+
+    private void OnAutoCheckUpdatesToggled(object? sender, RoutedEventArgs e)
+    {
+        if (_suppressUpdateOptionEvents || AutoCheckUpdatesToggleSwitch is null)
+        {
+            return;
+        }
+
+        _autoCheckUpdates = AutoCheckUpdatesToggleSwitch.IsChecked == true;
+        PersistSettings();
+    }
+
+    private void OnUpdateChannelSelectionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        if (_suppressUpdateOptionEvents || UpdateChannelChipListBox is null)
+        {
+            return;
+        }
+
+        var selectedChannel = UpdateChannelChipListBox.SelectedIndex == 1
+            ? UpdateChannelPreview
+            : UpdateChannelStable;
+
+        if (string.Equals(_updateChannel, selectedChannel, StringComparison.OrdinalIgnoreCase))
+        {
+            return;
+        }
+
+        _updateChannel = selectedChannel;
+        _latestReleaseInstallerAsset = null;
+        _latestReleaseVersionText = "-";
+        _latestReleasePublishedAt = null;
+        _downloadedUpdateInstallerPath = null;
+        _updateStatusText = Lf(
+            "settings.update.status_channel_changed_format",
+            "Update channel switched to {0}. Please check again.",
+            GetLocalizedUpdateChannelName(_updateChannel));
+        PersistSettings();
+        UpdateUpdatePanelState();
+    }
+
+    private async Task CheckForUpdatesAsync(bool silentWhenNoUpdate)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        if (!OperatingSystem.IsWindows())
+        {
+            _updateStatusText = L(
+                "settings.update.status_windows_only",
+                "Automatic installer update is currently available only on Windows.");
+            UpdateUpdatePanelState();
+            return;
+        }
+
+        _isCheckingUpdates = true;
+        _updateStatusText = L("settings.update.status_checking", "Checking GitHub releases...");
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        UpdateUpdatePanelState();
+
+        try
+        {
+            if (!Version.TryParse(GetAppVersionText(), out var currentVersion))
+            {
+                currentVersion = new Version(0, 0, 0);
+            }
+
+            var result = await _releaseUpdateService.CheckForUpdatesAsync(
+                currentVersion,
+                IncludePrereleaseUpdates);
+
+            if (!result.Success)
+            {
+                _latestReleaseInstallerAsset = null;
+                _latestReleaseVersionText = "-";
+                _latestReleasePublishedAt = null;
+                _downloadedUpdateInstallerPath = null;
+                _updateStatusText = Lf(
+                    "settings.update.status_check_failed_format",
+                    "Update check failed: {0}",
+                    result.ErrorMessage ?? L("common.unknown", "Unknown error"));
+                return;
+            }
+
+            _latestReleaseInstallerAsset = result.PreferredAsset;
+            _latestReleaseVersionText = result.LatestVersionText;
+            _latestReleasePublishedAt = result.Release?.PublishedAt;
+            _downloadedUpdateInstallerPath = null;
+
+            if (!result.IsUpdateAvailable)
+            {
+                _latestReleaseInstallerAsset = null;
+                _updateStatusText = silentWhenNoUpdate
+                    ? L("settings.update.status_up_to_date", "You are already on the latest version.")
+                    : L("settings.update.status_up_to_date", "You are already on the latest version.");
+                return;
+            }
+
+            if (_latestReleaseInstallerAsset is null)
+            {
+                _updateStatusText = L(
+                    "settings.update.status_asset_missing",
+                    "A new release is available, but no compatible installer was found.");
+                return;
+            }
+
+            _updateStatusText = Lf(
+                "settings.update.status_available_format",
+                "New version {0} is available. Click Download & Install.",
+                _latestReleaseVersionText);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_check_failed_format",
+                "Update check failed: {0}",
+                ex.Message);
+        }
+        finally
+        {
+            _isCheckingUpdates = false;
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private async Task DownloadAndInstallUpdateAsync(GitHubReleaseAsset asset)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        _isDownloadingUpdate = true;
+        _updateStatusText = L("settings.update.status_downloading", "Downloading installer...");
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = Lf(
+            "settings.update.download_progress_format",
+            "Download progress: {0:F0}%",
+            _updateDownloadProgressPercent);
+        UpdateUpdatePanelState();
+
+        try
+        {
+            var destinationPath = BuildUpdateInstallerPath(asset.Name);
+            var progress = new Progress<double>(value =>
+            {
+                _updateDownloadProgressPercent = Math.Clamp(value * 100d, 0d, 100d);
+                _updateDownloadProgressText = Lf(
+                    "settings.update.download_progress_format",
+                    "Download progress: {0:F0}%",
+                    _updateDownloadProgressPercent);
+                UpdateUpdatePanelState();
+            });
+
+            var result = await _releaseUpdateService.DownloadAssetAsync(asset, destinationPath, progress);
+            if (!result.Success || string.IsNullOrWhiteSpace(result.FilePath))
+            {
+                _updateStatusText = Lf(
+                    "settings.update.status_download_failed_format",
+                    "Download failed: {0}",
+                    result.ErrorMessage ?? L("common.unknown", "Unknown error"));
+                return;
+            }
+
+            _downloadedUpdateInstallerPath = result.FilePath;
+            _updateDownloadProgressPercent = 100;
+            _updateDownloadProgressText = Lf(
+                "settings.update.download_progress_format",
+                "Download progress: {0:F0}%",
+                _updateDownloadProgressPercent);
+            _updateStatusText = L("settings.update.status_launching_installer", "Download complete. Launching installer...");
+            UpdateUpdatePanelState();
+
+            LaunchInstallerAndExit(_downloadedUpdateInstallerPath);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_download_failed_format",
+                "Download failed: {0}",
+                ex.Message);
+        }
+        finally
+        {
+            _isDownloadingUpdate = false;
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private void LaunchInstallerAndExit(string installerPath)
+    {
+        if (string.IsNullOrWhiteSpace(installerPath) || !File.Exists(installerPath))
+        {
+            _updateStatusText = L(
+                "settings.update.status_installer_missing",
+                "Installer file was not found after download.");
+            UpdateUpdatePanelState();
+            return;
+        }
+
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = installerPath,
+                WorkingDirectory = Path.GetDirectoryName(installerPath) ?? Environment.CurrentDirectory,
+                UseShellExecute = true
+            });
+
+            _updateStatusText = L(
+                "settings.update.status_installer_started",
+                "Installer started. The app will close for update.");
+            UpdateUpdatePanelState();
+
+            Dispatcher.UIThread.Post(Close, DispatcherPriority.Background);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_launch_failed_format",
+                "Failed to start installer: {0}",
+                ex.Message);
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private void UpdateUpdatePanelState()
+    {
+        if (UpdateCurrentVersionValueTextBlock is not null)
+        {
+            UpdateCurrentVersionValueTextBlock.Text = GetAppVersionText();
+        }
+
+        if (UpdateLatestVersionValueTextBlock is not null)
+        {
+            UpdateLatestVersionValueTextBlock.Text = string.IsNullOrWhiteSpace(_latestReleaseVersionText)
+                ? "-"
+                : _latestReleaseVersionText;
+        }
+
+        if (UpdatePublishedAtValueTextBlock is not null)
+        {
+            UpdatePublishedAtValueTextBlock.Text = _latestReleasePublishedAt.HasValue &&
+                                                   _latestReleasePublishedAt.Value != DateTimeOffset.MinValue
+                ? _latestReleasePublishedAt.Value.LocalDateTime.ToString("yyyy-MM-dd HH:mm")
+                : "-";
+        }
+
+        if (UpdateStatusTextBlock is not null)
+        {
+            UpdateStatusTextBlock.Text = string.IsNullOrWhiteSpace(_updateStatusText)
+                ? L("settings.update.status_ready", "Ready to check for updates.")
+                : _updateStatusText;
+        }
+
+        if (UpdateDownloadProgressTextBlock is not null)
+        {
+            UpdateDownloadProgressTextBlock.Text = string.IsNullOrWhiteSpace(_updateDownloadProgressText)
+                ? L("settings.update.download_progress_idle", "Download progress: -")
+                : _updateDownloadProgressText;
+        }
+
+        if (UpdateDownloadProgressBar is not null)
+        {
+            UpdateDownloadProgressBar.IsVisible = _isDownloadingUpdate;
+            UpdateDownloadProgressBar.Value = Math.Clamp(_updateDownloadProgressPercent, 0d, 100d);
+        }
+
+        if (CheckForUpdatesButton is not null)
+        {
+            CheckForUpdatesButton.IsEnabled = !_isCheckingUpdates && !_isDownloadingUpdate;
+        }
+
+        if (DownloadAndInstallUpdateButton is not null)
+        {
+            DownloadAndInstallUpdateButton.IsEnabled = !_isCheckingUpdates &&
+                                                       !_isDownloadingUpdate &&
+                                                       _latestReleaseInstallerAsset is not null;
+        }
+    }
+
+    private static string NormalizeUpdateChannel(string? channel, bool includePrereleaseFallback)
+    {
+        if (string.Equals(channel, UpdateChannelPreview, StringComparison.OrdinalIgnoreCase))
+        {
+            return UpdateChannelPreview;
+        }
+
+        if (string.Equals(channel, UpdateChannelStable, StringComparison.OrdinalIgnoreCase))
+        {
+            return UpdateChannelStable;
+        }
+
+        return includePrereleaseFallback ? UpdateChannelPreview : UpdateChannelStable;
+    }
+
+    private string GetLocalizedUpdateChannelName(string channel)
+    {
+        return string.Equals(channel, UpdateChannelPreview, StringComparison.OrdinalIgnoreCase)
+            ? L("settings.update.channel_preview", "Preview")
+            : L("settings.update.channel_stable", "Stable");
+    }
+
+    private static string BuildUpdateInstallerPath(string assetName)
+    {
+        var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        var updatesDirectory = Path.Combine(appData, "LanMountainDesktop", "Updates");
+        Directory.CreateDirectory(updatesDirectory);
+
+        var safeName = SanitizeFileName(assetName);
+        return Path.Combine(updatesDirectory, safeName);
+    }
+
+    private static string SanitizeFileName(string fileName)
+    {
+        if (string.IsNullOrWhiteSpace(fileName))
+        {
+            return $"LanMountainDesktop-Update-{DateTime.Now:yyyyMMddHHmmss}.exe";
+        }
+
+        var sanitized = fileName;
+        foreach (var c in Path.GetInvalidFileNameChars())
+        {
+            sanitized = sanitized.Replace(c, '_');
+        }
+
+        return sanitized;
+    }
+}

LanMountainDesktop/Views/MainWindow.axaml

@@ -67,7 +67,7 @@
               VerticalAlignment="Stretch">
             <Grid.Transitions>
                 <Transitions>
-                    <DoubleTransition Property="Opacity" Duration="0:0:0.24" />
+                    <DoubleTransition Property="Opacity" Duration="{StaticResource FluttermotionToken.Duration.Page}" />
                 </Transitions>
             </Grid.Transitions>
 
@@ -83,11 +83,12 @@
                             VerticalAlignment="Stretch"
                             Background="{DynamicResource AdaptiveSurfaceBaseBrush}" />
 
-                    <vlc:VideoView x:Name="DesktopVideoWallpaperView"
-                                   IsVisible="False"
-                                   IsHitTestVisible="False"
-                                   HorizontalAlignment="Stretch"
-                                   VerticalAlignment="Stretch" />
+                    <Image x:Name="DesktopVideoWallpaperImage"
+                           IsVisible="False"
+                           IsHitTestVisible="False"
+                           Stretch="UniformToFill"
+                           HorizontalAlignment="Stretch"
+                           VerticalAlignment="Stretch" />
 
                     <Grid x:Name="DesktopGrid"
                           HorizontalAlignment="Center"
@@ -109,7 +110,7 @@
                                         <TranslateTransform>
                                             <TranslateTransform.Transitions>
                                                 <Transitions>
-                                                    <DoubleTransition Property="X" Duration="0:0:0.24" />
+                                                    <DoubleTransition Property="X" Duration="{StaticResource FluttermotionToken.Duration.Page}" />
                                                 </Transitions>
                                             </TranslateTransform.Transitions>
                                         </TranslateTransform>
@@ -349,7 +350,7 @@
               VerticalAlignment="Stretch">
             <Grid.Transitions>
                 <Transitions>
-                    <DoubleTransition Property="Opacity" Duration="0:0:0.24" />
+                    <DoubleTransition Property="Opacity" Duration="{StaticResource FluttermotionToken.Duration.Page}" />
                 </Transitions>
             </Grid.Transitions>
 
@@ -365,7 +366,7 @@
                     <TranslateTransform Y="30">
                         <TranslateTransform.Transitions>
                             <Transitions>
-                                <DoubleTransition Property="Y" Duration="0:0:0.24" />
+                                <DoubleTransition Property="Y" Duration="{StaticResource FluttermotionToken.Duration.Page}" />
                             </Transitions>
                         </TranslateTransform.Transitions>
                     </TranslateTransform>
@@ -447,6 +448,12 @@
                                             <TextBlock x:Name="SettingsNavRegionTextBlock" Text="&#22320;&#21306;" VerticalAlignment="Center" />
                                         </StackPanel>
                                     </ListBoxItem>
+                                    <ListBoxItem x:Name="SettingsNavUpdateItem" ToolTip.Tip="&#26356;&#26032;">
+                                        <StackPanel Orientation="Horizontal" Spacing="12">
+                                            <fi:SymbolIcon x:Name="SettingsNavUpdateIcon" Symbol="ArrowSync" IconVariant="Regular" />
+                                            <TextBlock x:Name="SettingsNavUpdateTextBlock" Text="&#26356;&#26032;" VerticalAlignment="Center" />
+                                        </StackPanel>
+                                    </ListBoxItem>
                                     <ListBoxItem x:Name="SettingsNavAboutItem" ToolTip.Tip="&#20851;&#20110;">
                                         <StackPanel Orientation="Horizontal" Spacing="12">
                                             <fi:SymbolIcon x:Name="SettingsNavAboutIcon" Symbol="Info" IconVariant="Regular" />
@@ -1378,6 +1385,114 @@
 </Border>
                                 </StackPanel>
 
+                                <StackPanel x:Name="UpdateSettingsPanel" IsVisible="False" Spacing="16">
+                                    <TextBlock x:Name="UpdatePanelTitleTextBlock"
+                                               FontSize="24"
+                                               FontWeight="SemiBold"
+                                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}"
+                                               Text="Update" />
+
+                                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}" CornerRadius="{DynamicResource DesignCornerRadiusMd}" Padding="20">
+                                        <Grid ColumnDefinitions="Auto,*" RowDefinitions="Auto,Auto,Auto" ColumnSpacing="12" RowSpacing="8">
+                                            <TextBlock x:Name="UpdateCurrentVersionLabelTextBlock"
+                                                       Text="Current Version"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdateCurrentVersionValueTextBlock"
+                                                       Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+                                            <TextBlock x:Name="UpdateLatestVersionLabelTextBlock"
+                                                       Grid.Row="1"
+                                                       Text="Latest Release"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdateLatestVersionValueTextBlock"
+                                                       Grid.Row="1" Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+                                            <TextBlock x:Name="UpdatePublishedAtLabelTextBlock"
+                                                       Grid.Row="2"
+                                                       Text="Published At"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdatePublishedAtValueTextBlock"
+                                                       Grid.Row="2" Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                                        </Grid>
+                                    </Border>
+
+                                    <Border Classes="settings-expander-shell">
+                                        <ui:SettingsExpander x:Name="UpdateOptionsSettingsExpander"
+                                                             Header="Update Options"
+                                                             Description="Configure update checks and release channel."
+                                                             IsExpanded="True">
+                                            <ui:SettingsExpander.Footer>
+                                                <StackPanel Spacing="10">
+                                                    <ToggleSwitch x:Name="AutoCheckUpdatesToggleSwitch"
+                                                                  Checked="OnAutoCheckUpdatesToggled"
+                                                                  Unchecked="OnAutoCheckUpdatesToggled"
+                                                                  Content="Automatically check for updates on startup" />
+                                                    <TextBlock x:Name="UpdateChannelLabelTextBlock"
+                                                               Text="Update Channel"
+                                                               FontWeight="SemiBold"
+                                                               Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                                    <ListBox x:Name="UpdateChannelChipListBox"
+                                                             SelectionChanged="OnUpdateChannelSelectionChanged">
+                                                        <ListBox.ItemsPanel>
+                                                            <ItemsPanelTemplate>
+                                                                <StackPanel Orientation="Horizontal" Spacing="8" />
+                                                            </ItemsPanelTemplate>
+                                                        </ListBox.ItemsPanel>
+                                                        <ListBoxItem x:Name="UpdateChannelStableChipItem"
+                                                                     Tag="Stable"
+                                                                     Content="Stable" />
+                                                        <ListBoxItem x:Name="UpdateChannelPreviewChipItem"
+                                                                     Tag="Preview"
+                                                                     Content="Preview" />
+                                                    </ListBox>
+                                                </StackPanel>
+                                            </ui:SettingsExpander.Footer>
+                                        </ui:SettingsExpander>
+                                    </Border>
+
+                                    <Border Classes="settings-expander-shell">
+                                        <ui:SettingsExpander x:Name="UpdateActionsSettingsExpander"
+                                                             Header="Update Actions"
+                                                             Description="Check releases, download installer, and start update."
+                                                             IsExpanded="True">
+                                            <ui:SettingsExpander.Footer>
+                                                <StackPanel Spacing="10">
+                                                    <StackPanel Orientation="Horizontal" Spacing="10">
+                                                        <Button x:Name="CheckForUpdatesButton"
+                                                                MinWidth="140"
+                                                                Click="OnCheckForUpdatesClick"
+                                                                Content="Check for Updates" />
+                                                        <Button x:Name="DownloadAndInstallUpdateButton"
+                                                                MinWidth="180"
+                                                                Click="OnDownloadAndInstallUpdateClick"
+                                                                Content="Download &amp; Install" />
+                                                    </StackPanel>
+                                                    <ProgressBar x:Name="UpdateDownloadProgressBar"
+                                                                 Minimum="0"
+                                                                 Maximum="100"
+                                                                 Height="6"
+                                                                 IsVisible="False" />
+                                                    <TextBlock x:Name="UpdateDownloadProgressTextBlock"
+                                                               Text="Download progress: -"
+                                                               Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                                    <TextBlock x:Name="UpdateStatusTextBlock"
+                                                               Text="Ready to check for updates."
+                                                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                                                </StackPanel>
+                                            </ui:SettingsExpander.Footer>
+                                        </ui:SettingsExpander>
+                                    </Border>
+                                </StackPanel>
+
                                 <StackPanel x:Name="AboutSettingsPanel" IsVisible="False" Spacing="20">
                                     <TextBlock x:Name="AboutPanelTitleTextBlock" FontSize="24" FontWeight="SemiBold" Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" Text="About" />
                                         <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}" CornerRadius="{DynamicResource DesignCornerRadiusMd}" Padding="20">
@@ -1471,7 +1586,7 @@
                 PointerReleased="OnComponentLibraryWindowPointerReleased">
             <Border.Transitions>
                 <Transitions>
-                    <DoubleTransition Property="Opacity" Duration="0:0:0.2" />
+                    <DoubleTransition Property="Opacity" Duration="{StaticResource FluttermotionToken.Duration.Slow}" />
                 </Transitions>
             </Border.Transitions>
 
@@ -1582,7 +1697,7 @@
                                                 <TranslateTransform>
                                                     <TranslateTransform.Transitions>
                                                         <Transitions>
-                                                            <DoubleTransition Property="X" Duration="0:0:0.22" />
+                                                            <DoubleTransition Property="X" Duration="{StaticResource FluttermotionToken.Duration.Page}" />
                                                         </Transitions>
                                                     </TranslateTransform.Transitions>
                                                 </TranslateTransform>

LanMountainDesktop/Views/MainWindow.axaml.cs

@@ -58,7 +58,7 @@ public partial class MainWindow : Window
     private const int MinEdgeInsetPercent = 0;
     private const int MaxEdgeInsetPercent = 30;
     private const int DefaultEdgeInsetPercent = 18;
-    private static readonly int SettingsTransitionDurationMs = (int)UiMotionTokens.Page.TotalMilliseconds;
+    private static readonly int SettingsTransitionDurationMs = (int)FluttermotionToken.Page.TotalMilliseconds;
     private const double WallpaperPreviewMaxWidth = 520;
     private const double LightBackgroundLuminanceThreshold = 0.57;
     private const string TaskbarLayoutBottomFullRowMacStyle = "BottomFullRowMacStyle";
@@ -91,6 +91,7 @@ public partial class MainWindow : Window
     private readonly LocalizationService _localizationService = new();
     private readonly TimeZoneService _timeZoneService = new();
     private readonly WindowsStartupService _windowsStartupService = new();
+    private readonly GitHubReleaseUpdateService _releaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
     private readonly IWeatherDataService _weatherDataService = new XiaomiWeatherService();
     private readonly IRecommendationInfoService _recommendationInfoService = new RecommendationDataService();
     private readonly ComponentRegistry _componentRegistry = ComponentRegistry
@@ -126,6 +127,19 @@ public partial class MainWindow : Window
     private Media? _videoWallpaperMedia;
     private MediaPlayer? _previewVideoWallpaperPlayer;
     private Media? _previewVideoWallpaperMedia;
+    private readonly object _desktopVideoFrameSync = new();
+    private MediaPlayer.LibVLCVideoLockCb? _desktopVideoLockCallback;
+    private MediaPlayer.LibVLCVideoUnlockCb? _desktopVideoUnlockCallback;
+    private MediaPlayer.LibVLCVideoDisplayCb? _desktopVideoDisplayCallback;
+    private IntPtr _desktopVideoFrameBufferPtr;
+    private byte[]? _desktopVideoStagingBuffer;
+    private WriteableBitmap? _desktopVideoBitmap;
+    private int _desktopVideoFrameWidth;
+    private int _desktopVideoFrameHeight;
+    private int _desktopVideoFramePitch;
+    private int _desktopVideoFrameBufferSize;
+    private int _desktopVideoFrameDirtyFlag;
+    private int _desktopVideoFrameUiRefreshScheduledFlag;
     private string? _wallpaperPath;
     private string _wallpaperStatus = "Current background uses solid color.";
     private IReadOnlyList<Color> _recommendedColors = Array.Empty<Color>();
@@ -221,7 +235,7 @@ public partial class MainWindow : Window
         GridSizeSlider.ValueChanged += OnGridSizeSliderChanged;
         GridSizeNumberBox.ValueChanged += OnGridSizeNumberBoxChanged;
 
-        SettingsNavListBox.SelectedIndex = Math.Clamp(snapshot.SettingsTabIndex, 0, 6);
+        SettingsNavListBox.SelectedIndex = Math.Clamp(snapshot.SettingsTabIndex, 0, 7);
         UpdateSettingsTabContent();
 
         WallpaperPlacementComboBox.SelectedIndex = GetPlacementIndexFromSetting(snapshot.WallpaperPlacement);
@@ -231,6 +245,7 @@ public partial class MainWindow : Window
         InitializeWeatherSettings(snapshot);
         _dailyArtworkMirrorSource = DailyArtworkMirrorSources.Normalize(snapshot.DailyArtworkMirrorSource);
         InitializeAutoStartWithWindowsSetting(snapshot);
+        InitializeUpdateSettings(snapshot);
         InitializeDesktopSurfaceState(snapshot);
         InitializeDesktopComponentPlacements(snapshot);
         InitializeSettingsIcons();
@@ -262,6 +277,8 @@ public partial class MainWindow : Window
 
         _suppressSettingsPersistence = false;
         PersistSettings();
+
+        TriggerAutoUpdateCheckIfEnabled();
     }
 
     protected override void OnClosed(EventArgs e)
@@ -287,6 +304,7 @@ public partial class MainWindow : Window
         {
             recommendationServiceDisposable.Dispose();
         }
+        _releaseUpdateService.Dispose();
         _wallpaperBitmap?.Dispose();
         _wallpaperBitmap = null;
         PropertyChanged -= OnWindowPropertyChanged;