Fix color issues for operation output and theme switching

src/UniGetUI.Avalonia/Assets/Styles/Styles.Windows.axaml

@@ -39,6 +39,8 @@
                     <SolidColorBrush x:Key="StatusErrorForeground"       Color="#ef9a9a"/>
                     <!-- Setting warning subtext -->
                     <SolidColorBrush x:Key="SettingWarningTextForeground" Color="#ffc107"/>
+                    <!-- Operation log output text -->
+                    <SolidColorBrush x:Key="LogOutputVerboseForeground"   Color="#9D9D9D"/>
                 </ResourceDictionary>
                 <ResourceDictionary x:Key="Light">
                     <!-- Settings cards -->
@@ -76,6 +78,8 @@
                     <SolidColorBrush x:Key="StatusErrorForeground"       Color="#c62828"/>
                     <!-- Setting warning subtext -->
                     <SolidColorBrush x:Key="SettingWarningTextForeground" Color="#a05c00"/>
+                    <!-- Operation log output text -->
+                    <SolidColorBrush x:Key="LogOutputVerboseForeground"   Color="#5C5C5C"/>
                 </ResourceDictionary>
             </ResourceDictionary.ThemeDictionaries>
         </ResourceDictionary>

src/UniGetUI.Avalonia/ViewModels/DialogPages/OperationOutputViewModel.cs

@@ -1,5 +1,7 @@
 using System.Collections.ObjectModel;
+using Avalonia;
 using Avalonia.Media;
+using Avalonia.Styling;
 using Avalonia.Threading;
 using CommunityToolkit.Mvvm.ComponentModel;
 using UniGetUI.Avalonia.ViewModels.Pages.LogPages;
@@ -12,12 +14,17 @@ public partial class OperationOutputViewModel : ObservableObject
     [ObservableProperty] private string _title = "";
     public ObservableCollection<LogLineItem> OutputLines { get; } = new();
 
-    private static readonly IBrush _errorBrush = new SolidColorBrush(Color.Parse("#FF6B6B"));
-    private static readonly IBrush _debugBrush = new SolidColorBrush(Color.Parse("#888888"));
-    private static readonly IBrush _normalBrush = Brushes.White;
+    private readonly IBrush _errorBrush;
+    private readonly IBrush _debugBrush;
+    private readonly IBrush _normalBrush;
 
     public OperationOutputViewModel(AbstractOperation operation)
     {
+        var theme = Application.Current?.ActualThemeVariant ?? ThemeVariant.Default;
+        _errorBrush = LookupBrush("StatusErrorForeground", theme, new SolidColorBrush(Color.Parse("#c62828")));
+        _debugBrush = LookupBrush("LogOutputVerboseForeground", theme, new SolidColorBrush(Color.Parse("#767676")));
+        _normalBrush = LookupBrush("SystemControlForegroundBaseHighBrush", theme, Brushes.White);
+
         Title = operation.Metadata.Title;
 
         foreach (var (text, type) in operation.GetOutput())
@@ -27,6 +34,13 @@ public OperationOutputViewModel(AbstractOperation operation)
             Dispatcher.UIThread.Post(() => OutputLines.Add(MakeLine(ev.Item1, ev.Item2)));
     }
 
+    private static IBrush LookupBrush(string key, ThemeVariant theme, IBrush fallback)
+    {
+        if (Application.Current?.TryGetResource(key, theme, out var resource) == true && resource is IBrush brush)
+            return brush;
+        return fallback;
+    }
+
     private LogLineItem MakeLine(string text, AbstractOperation.LineType type)
     {
         IBrush brush = type switch

src/UniGetUI.Avalonia/ViewModels/DialogPages/OperationViewModel.cs

@@ -289,7 +289,6 @@ private static MenuItem Item(string translationKey, string svgName, bool enabled
                 Path = $"avares://UniGetUI.Avalonia/Assets/Symbols/{svgName}",
                 Width = 16,
                 Height = 16,
-                Foreground = Brushes.White,
             },
         };
 

src/UniGetUI.Avalonia/Views/Controls/InfoBar.axaml

@@ -6,6 +6,25 @@
              xmlns:controls="using:UniGetUI.Avalonia.Views.Controls"
              x:DataType="vm:InfoBarViewModel">
 
+    <UserControl.Styles>
+        <Style Selector="Border.severity-success">
+            <Setter Property="Background"   Value="{DynamicResource StatusSuccessBackground}"/>
+            <Setter Property="BorderBrush"  Value="{DynamicResource StatusSuccessBorderBrush}"/>
+        </Style>
+        <Style Selector="Border.severity-error">
+            <Setter Property="Background"   Value="{DynamicResource StatusErrorBackground}"/>
+            <Setter Property="BorderBrush"  Value="{DynamicResource StatusErrorBorderBrush}"/>
+        </Style>
+        <Style Selector="Border.severity-warning">
+            <Setter Property="Background"   Value="{DynamicResource WarningBannerBackground}"/>
+            <Setter Property="BorderBrush"  Value="{DynamicResource WarningBannerBorderBrush}"/>
+        </Style>
+        <Style Selector="Border.severity-info">
+            <Setter Property="Background"   Value="{DynamicResource StatusInfoBackground}"/>
+            <Setter Property="BorderBrush"  Value="{DynamicResource StatusInfoBorderBrush}"/>
+        </Style>
+    </UserControl.Styles>
+
     <Border x:Name="BodyBorder"
             IsVisible="{Binding IsOpen}"
             BorderThickness="0,1,0,1"

src/UniGetUI.Avalonia/Views/Controls/InfoBar.axaml.cs

@@ -43,7 +43,14 @@ private void OnViewModelPropertyChanged(object? sender, System.ComponentModel.Pr
 
     private void ApplySeverity(InfoBarSeverity severity)
     {
-        // Update strip colour
+        // Background + border: swap a single CSS class — DynamicResource in the style
+        // handles theme changes automatically without any event subscription.
+        BodyBorder.Classes.Set("severity-success", severity == InfoBarSeverity.Success);
+        BodyBorder.Classes.Set("severity-error", severity == InfoBarSeverity.Error);
+        BodyBorder.Classes.Set("severity-warning", severity == InfoBarSeverity.Warning);
+        BodyBorder.Classes.Set("severity-info", severity == InfoBarSeverity.Informational);
+
+        // Strip colour (solid, not theme-sensitive)
         var stripColor = severity switch
         {
             InfoBarSeverity.Warning => Color.Parse("#F7A800"),
@@ -53,29 +60,7 @@ private void ApplySeverity(InfoBarSeverity severity)
         };
         SeverityStrip.Background = new SolidColorBrush(stripColor);
 
-        // Update body background/border from theme resources
-        string bgKey = severity switch
-        {
-            InfoBarSeverity.Warning => "WarningBannerBackground",
-            InfoBarSeverity.Error => "StatusErrorBackground",
-            InfoBarSeverity.Success => "StatusSuccessBackground",
-            _ => "StatusInfoBackground",
-        };
-        string borderKey = severity switch
-        {
-            InfoBarSeverity.Warning => "WarningBannerBorderBrush",
-            InfoBarSeverity.Error => "StatusErrorBorderBrush",
-            InfoBarSeverity.Success => "StatusSuccessBorderBrush",
-            _ => "StatusInfoBorderBrush",
-        };
-
-        var theme = Application.Current?.ActualThemeVariant;
-        if (Application.Current?.TryGetResource(bgKey, theme, out var bg) == true && bg is IBrush bgBrush)
-            BodyBorder.Background = bgBrush;
-        if (Application.Current?.TryGetResource(borderKey, theme, out var border) == true && border is IBrush borderBrush)
-            BodyBorder.BorderBrush = borderBrush;
-
-        // Update icon
+        // Icon shape
         SeverityIcon.Data = Geometry.Parse(severity switch
         {
             InfoBarSeverity.Warning => WarningPath,
@@ -84,14 +69,7 @@ private void ApplySeverity(InfoBarSeverity severity)
             _ => InfoPath,
         });
 
-        // Icon foreground
-        var iconColor = severity switch
-        {
-            InfoBarSeverity.Warning => Color.Parse("#F7A800"),
-            InfoBarSeverity.Error => Color.Parse("#C42B1C"),
-            InfoBarSeverity.Success => Color.Parse("#107C10"),
-            _ => Color.Parse("#0078D4"),
-        };
-        SeverityIcon.Foreground = new SolidColorBrush(iconColor);
+        // Icon foreground (solid, not theme-sensitive)
+        SeverityIcon.Foreground = new SolidColorBrush(stripColor);
     }
 }

src/UniGetUI.Avalonia/Views/Controls/SvgIcon.cs

@@ -5,8 +5,10 @@
 using Avalonia;
 using Avalonia.Automation;
 using Avalonia.Controls;
+using Avalonia.Data;
 using Avalonia.Media;
 using Avalonia.Platform;
+using Avalonia.Styling;
 
 namespace UniGetUI.Avalonia.Views.Controls;
 
@@ -35,6 +37,7 @@ public string? Path
         set => SetValue(PathProperty, value);
     }
 
+    private IBrush? _localForeground;
     public IBrush? Foreground
     {
         get => GetValue(ForegroundProperty);
@@ -50,13 +53,35 @@ static SvgIcon()
         AffectsMeasure<SvgIcon>(PathProperty);
     }
 
+    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+    {
+        base.OnAttachedToVisualTree(e);
+        if (Application.Current is { } app)
+            app.ActualThemeVariantChanged += OnThemeChanged;
+    }
+
+    protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
+    {
+        base.OnDetachedFromVisualTree(e);
+        if (Application.Current is { } app)
+            app.ActualThemeVariantChanged -= OnThemeChanged;
+    }
+
     protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
     {
         base.OnPropertyChanged(change);
-        if (change.Property == PathProperty)
+        if (change.Property == ForegroundProperty)
+        {
+            _localForeground = change.Priority < BindingPriority.Style
+                ? change.NewValue as IBrush
+                : null;
+        }
+        else if (change.Property == PathProperty)
             LoadSvg(change.NewValue as string);
     }
 
+    private void OnThemeChanged(object? sender, EventArgs e) => InvalidateVisual();
+
     private void LoadSvg(string? uri)
     {
         _geometries.Clear();
@@ -134,6 +159,14 @@ private void LoadSvg(string? uri)
         InvalidateVisual();
     }
 
+    private static readonly IBrush _darkFg = new SolidColorBrush(Color.Parse("#E8E8E8"));
+    private static readonly IBrush _lightFg = new SolidColorBrush(Color.Parse("#1E1E1E"));
+
+    private static IBrush LookupThemeForeground() =>
+        Application.Current?.ActualThemeVariant == ThemeVariant.Dark
+            ? _darkFg
+            : _lightFg;
+
     protected override Size MeasureOverride(Size availableSize)
     {
         double w = double.IsInfinity(availableSize.Width) ? _viewBoxWidth : availableSize.Width;
@@ -145,7 +178,7 @@ public override void Render(DrawingContext context)
     {
         if (_geometries.Count == 0) return;
 
-        IBrush brush = Foreground ?? Brushes.Black;
+        IBrush brush = _localForeground ?? LookupThemeForeground();
 
         double scaleX = Bounds.Width / _viewBoxWidth;
         double scaleY = Bounds.Height / _viewBoxHeight;

src/UniGetUI.Avalonia/Views/MainWindow.axaml

@@ -211,7 +211,7 @@
                                                             <StackPanel Orientation="Horizontal" Spacing="4">
                                                                 <controls:SvgIcon Path="{Binding IconPath}"
                                                                                   Width="12" Height="12"
-                                                                                  Foreground="White"/>
+                                                                                  Foreground="{DynamicResource AppIconForeground}"/>
                                                                 <TextBlock Text="{Binding Label}"
                                                                            FontSize="10"
                                                                            Opacity="0.8"/>