LanMountainDesktop/LanMountainDesktop/Views/NotificationDialogWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:fi="using:FluentIcons.Avalonia"
        xmlns:vm="using:LanMountainDesktop.Views"
        x:Class="LanMountainDesktop.Views.NotificationDialogWindow"
        x:DataType="vm:NotificationDialogViewModel"
        SystemDecorations="None"
        Background="Transparent"
        ShowInTaskbar="False"
        Topmost="True"
        CanResize="False"
        SizeToContent="WidthAndHeight"
        TransparencyLevelHint="Transparent"
        ExtendClientAreaToDecorationsHint="True"
        ExtendClientAreaChromeHints="NoChrome"
        ExtendClientAreaTitleBarHeightHint="-1">

    <Border x:Name="DialogCard"
            Background="#E8EAED"
            CornerRadius="28"
            Padding="24,20"
            MinWidth="320"
            MaxWidth="480">
        <StackPanel Spacing="16">
            <!-- Header with icon and title -->
            <Grid ColumnDefinitions="Auto,*" ColumnSpacing="12">
                <Border Grid.Column="0"
                        Width="40"
                        Height="40"
                        CornerRadius="20"
                        Background="{Binding SeverityBackground}"
                        VerticalAlignment="Center">
                    <fi:SymbolIcon Symbol="{Binding SeverityIcon}"
                                   FontSize="20"
                                   Foreground="White"
                                   HorizontalAlignment="Center"
                                   VerticalAlignment="Center" />
                </Border>
                <TextBlock Grid.Column="1"
                          Text="{Binding Title}"
                          FontSize="18"
                          FontWeight="SemiBold"
                          TextWrapping="Wrap"
                          VerticalAlignment="Center"
                          Foreground="{DynamicResource SystemControlForegroundBaseHighBrush}" />
            </Grid>

            <!-- Message content -->
            <TextBlock Text="{Binding Message}"
                      FontSize="14"
                      TextWrapping="Wrap"
                      Foreground="{DynamicResource SystemControlForegroundBaseMediumBrush}"
                      IsVisible="{Binding Message, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />

            <!-- Action buttons -->
            <StackPanel Orientation="Horizontal"
                       Spacing="8"
                       HorizontalAlignment="Right"
                       IsVisible="{Binding HasButtons}">
                <Button Content="{Binding SecondaryButtonText}"
                       Command="{Binding SecondaryCommand}"
                       CornerRadius="20"
                       Padding="20,10"
                       IsVisible="{Binding SecondaryButtonText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
                <Button Content="{Binding PrimaryButtonText}"
                       Command="{Binding PrimaryCommand}"
                       Classes="accent"
                       CornerRadius="20"
                       Padding="20,10"
                       IsVisible="{Binding PrimaryButtonText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
            </StackPanel>
        </StackPanel>
    </Border>
</Window>