LanMountainDesktop/LanMountainDesktop/Views/ComponentEditorWindow.axaml

<Window 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:fa="clr-namespace:FluentIcons.Avalonia.Fluent;assembly=FluentIcons.Avalonia.Fluent"
        xmlns:mi="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
        xmlns:themes="clr-namespace:Material.Styles.Themes;assembly=Material.Styles"
        mc:Ignorable="d"
        x:Class="LanMountainDesktop.Views.ComponentEditorWindow"
        x:Name="RootWindow"
        Classes="component-editor-window"
        Width="720"
        Height="540"
        MinWidth="420"
        MinHeight="320"
        CanResize="True"
        SizeToContent="Manual"
        ShowInTaskbar="False"
        SystemDecorations="BorderOnly"
        Background="Transparent"
        Title="Component Editor">
    <Window.Resources>
        <!-- Material Design 3 Brushes -->
        <SolidColorBrush x:Key="EditorWindowBackgroundBrush" Color="#FFFEF7FF" />
        <SolidColorBrush x:Key="EditorSurfaceBrush" Color="#FFFEF7FF" />
        <SolidColorBrush x:Key="EditorSurfaceContainerBrush" Color="#FFF3EDF7" />
        <SolidColorBrush x:Key="EditorSurfaceContainerHighBrush" Color="#FFE6E0E9" />
        <SolidColorBrush x:Key="EditorTopAppBarBackgroundBrush" Color="#FFF3EDF7" />
        <SolidColorBrush x:Key="EditorHeaderIconBackgroundBrush" Color="#FFEADDFF" />
        <SolidColorBrush x:Key="EditorTitleBarButtonHoverBrush" Color="#121D1B20" />
        <SolidColorBrush x:Key="EditorPrimaryBrush" Color="#FF6750A4" />
        <SolidColorBrush x:Key="EditorOnPrimaryBrush" Color="#FFFFFFFF" />
        <SolidColorBrush x:Key="EditorSecondaryBrush" Color="#FF625B71" />
        <SolidColorBrush x:Key="EditorTertiaryBrush" Color="#FF7D5260" />
        <SolidColorBrush x:Key="EditorSelectFieldBackgroundBrush" Color="#FFE6E0E9" />
        <SolidColorBrush x:Key="EditorSelectFieldHoverBrush" Color="#FFE0DAE4" />
        <SolidColorBrush x:Key="EditorSelectFieldFocusBrush" Color="#FFDDD3E6" />
        <SolidColorBrush x:Key="EditorSelectOutlineBrush" Color="#FF79747E" />
        <SolidColorBrush x:Key="EditorSelectOutlineStrongBrush" Color="#FF6750A4" />
        <SolidColorBrush x:Key="EditorSelectMenuItemHoverBrush" Color="#1F6750A4" />
        <SolidColorBrush x:Key="EditorSelectMenuItemSelectedBrush" Color="#306750A4" />
        <SolidColorBrush x:Key="ComponentEditorHeroBackgroundBrush" Color="#FFEADDFF" />
        <SolidColorBrush x:Key="ComponentEditorCardBackgroundBrush" Color="#FFF3EDF7" />
        <SolidColorBrush x:Key="ComponentEditorCardBorderBrush" Color="#FFCAC4D0" />
        <SolidColorBrush x:Key="ComponentEditorPrimaryTextBrush" Color="#FF1D1B20" />
        <SolidColorBrush x:Key="ComponentEditorSecondaryTextBrush" Color="#FF49454F" />
        <SolidColorBrush x:Key="EditorDividerBrush" Color="#FFCAC4D0" />
    </Window.Resources>

    <Window.Styles>
        <themes:CustomMaterialTheme BaseTheme="Light" PrimaryColor="#6750A4" SecondaryColor="#625B71" />
        <StyleInclude Source="avares://LanMountainDesktop/Styles/ComponentEditorThemeResources.axaml" />
        
        <!-- MD3 Button Styles -->
        <Style Selector="Button.component-editor-footer-button">
            <Setter Property="CornerRadius" Value="{DynamicResource DesignCornerRadiusComponent}" />
            <Setter Property="Background" Value="{DynamicResource EditorPrimaryBrush}" />
            <Setter Property="Foreground" Value="{DynamicResource EditorOnPrimaryBrush}" />
            <Setter Property="Height" Value="40" />
        </Style>
    </Window.Styles>

    <Grid Background="{DynamicResource EditorWindowBackgroundBrush}"
          RowDefinitions="Auto,*">
        <Border x:Name="CustomTitleBarHost"
                Padding="24,16"
                Background="{DynamicResource EditorWindowBackgroundBrush}"
                IsVisible="False"
                PointerPressed="OnWindowTitleBarPointerPressed">
            <Grid ColumnDefinitions="Auto,*,Auto"
                  ColumnSpacing="16">
                <mi:MaterialIcon x:Name="HeaderIcon"
                                 Width="28"
                                 Height="28"
                                 Foreground="{DynamicResource EditorPrimaryBrush}"
                                 VerticalAlignment="Center" />

                <StackPanel Grid.Column="1"
                            Spacing="0"
                            VerticalAlignment="Center">
                    <TextBlock x:Name="TitleTextBlock"
                               Classes="component-editor-headline"
                               FontSize="20"
                               FontWeight="SemiBold"
                               TextTrimming="CharacterEllipsis" />
                </StackPanel>

                <Button Grid.Column="2"
                        Classes="component-editor-titlebar-button"
                        VerticalAlignment="Center"
                        Background="Transparent"
                        BorderThickness="0"
                        Width="40" Height="40"
                        Padding="8"
                        Click="OnCloseClick">
                    <mi:MaterialIcon Kind="Close"
                                     Width="24" Height="24" />
                </Button>
            </Grid>
        </Border>

        <Border Grid.Row="1"
                Background="{DynamicResource EditorSurfaceContainerBrush}"
                CornerRadius="{DynamicResource DesignCornerRadiusComponent}"
                Margin="16,0,16,16"
                ClipToBounds="True">
            <Panel>
                <ScrollViewer Classes="component-editor-scroll-host"
                              HorizontalScrollBarVisibility="Disabled"
                              VerticalScrollBarVisibility="Auto">
                    <ContentControl x:Name="EditorContentHost"
                                    Margin="24,0,24,100"
                                    HorizontalContentAlignment="Stretch"
                                    VerticalContentAlignment="Stretch" />
                </ScrollViewer>

                <!-- Floating Save Button (MD3 Style) -->
                <Button x:Name="SaveFAB"
                        HorizontalAlignment="Right"
                        VerticalAlignment="Bottom"
                        Margin="28"
                        Width="64"
                        Height="64"
                        Background="{DynamicResource EditorPrimaryBrush}"
                        Foreground="{DynamicResource EditorOnPrimaryBrush}"
                        CornerRadius="{DynamicResource DesignCornerRadiusComponent}"
                        Classes="accent"
                        Click="OnCloseClick">
                    <Button.Styles>
                        <Style Selector="Button:pointerover">
                            <Setter Property="RenderTransform" Value="scale(1.05)" />
                        </Style>
                    </Button.Styles>
                    <mi:MaterialIcon Kind="Check"
                                     Width="32"
                                     Height="32" />
                </Button>
            </Panel>
        </Border>
    </Grid>
</Window>