theme improvements

- force Light theme variant (temporary) to match the actual UI look
- define some colors and brushes in AppTheme to avoid repetition
- fix text color in AboutWindow

src/KeyKeeper/AboutWindow.cs

@@ -15,7 +15,8 @@ public class AboutWindow : Window
         this.MinWidth = 450;
         this.MinHeight = 250;
 
-        this.Background = new SolidColorBrush(Color.Parse("#2328c4"));
+        this.Background = this.FindResource("KeyKeeperAboutWindowBackgroundBrush") as IBrush;
+        this.Foreground = this.FindResource("KeyKeeperAboutWindowForegroundBrush") as IBrush;
 
         var AboutKeyKeeper = new TextBlock
         {

src/KeyKeeper/App.axaml

@@ -2,7 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="KeyKeeper.App"
              xmlns:local="using:KeyKeeper"
-             RequestedThemeVariant="Default">
+             RequestedThemeVariant="Light">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
     <Application.DataTemplates>

src/KeyKeeper/Styles/AppTheme.axaml

@@ -8,6 +8,21 @@
 
     <StyleInclude Source="avares://Avalonia.Themes.Fluent/FluentTheme.xaml"/>
 
+    <Styles.Resources>
+      <ResourceDictionary>
+        <ResourceDictionary.ThemeDictionaries>
+          <ResourceDictionary x:Key="Default">
+            <Color x:Key="KeyKeeperAccentColor">#FF2328C4</Color>
+            <Color x:Key="KeyKeeperForeground">#00000000</Color>
+            <Color x:Key="KeyKeeperBackground">#FFFFFFFF</Color>
+
+            <SolidColorBrush x:Key="KeyKeeperAboutWindowBackgroundBrush" Color="{DynamicResource KeyKeeperAccentColor}" />
+            <SolidColorBrush x:Key="KeyKeeperAboutWindowForegroundBrush" Color="#FFFFFFFF" />
+          </ResourceDictionary>
+        </ResourceDictionary.ThemeDictionaries>
+      </ResourceDictionary>
+    </Styles.Resources>
+
     <Style Selector="Button:not(.dummy) /template/ ContentPresenter#PART_ContentPresenter">
         <Setter Property="Background" Value="#cccccc" />
         <Setter Property="Foreground" Value="#000000" />
@@ -20,7 +35,6 @@
         <Setter Property="Background" Value="#444444" />
         <Setter Property="Foreground" Value="#ffffff" />
     </Style>
-
     <Style Selector="Button.accentSidebarButton /template/ ContentPresenter#PART_ContentPresenter">
         <Setter Property="Background" Value="#00000000" />
         <Setter Property="Foreground" Value="white" />
@@ -33,6 +47,6 @@
         <Setter Property="CornerRadius" Value="9" />
         <Setter Property="BorderBrush" Value="white" />
         <Setter Property="Background" Value="white"/>
-        <Setter Property="Foreground" Value="#2328C4"/>
+        <Setter Property="Foreground" Value="{DynamicResource KeyKeeperAccentColor}"/>
     </Style>
 </Styles>