in settings, flatten the top-level sections so they sit directly on the window background, while keeping the inner editor cards where they still help group controls. the background should use the default window color

DesktopClock/SettingsWindow.xaml

@@ -13,7 +13,7 @@
         MinWidth="1120"
         MinHeight="720"
         ResizeMode="CanResize"
-        Background="#EEF3F8"
+        Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
         WindowStartupLocation="CenterScreen">
     <Window.Resources>
         <SolidColorBrush x:Key="CardBrush"
@@ -132,11 +132,10 @@
 
         <Style x:Key="SectionCardStyle"
                TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource CardBrush}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderBrush}" />
-            <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="CornerRadius" Value="10" />
-            <Setter Property="Padding" Value="24" />
+            <Setter Property="Background" Value="Transparent" />
+            <Setter Property="BorderThickness" Value="0" />
+            <Setter Property="CornerRadius" Value="0" />
+            <Setter Property="Padding" Value="0" />
             <Setter Property="Margin" Value="0,0,0,20" />
         </Style>