diff --git a/src/SwitchifyPc.App/App.xaml b/src/SwitchifyPc.App/App.xaml
index a3307d5..f8b4886 100644
--- a/src/SwitchifyPc.App/App.xaml
+++ b/src/SwitchifyPc.App/App.xaml
@@ -2,5 +2,10 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Themes/Theme.Light.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
     </Application.Resources>
 </Application>
diff --git a/src/SwitchifyPc.App/App.xaml.cs b/src/SwitchifyPc.App/App.xaml.cs
index 22c1559..003aff7 100644
--- a/src/SwitchifyPc.App/App.xaml.cs
+++ b/src/SwitchifyPc.App/App.xaml.cs
@@ -14,6 +14,7 @@
 using SwitchifyPc.Core.Startup;
 using SwitchifyPc.Core.Ui;
 using SwitchifyPc.Core.Updates;
+using SwitchifyPc.App.Themes;
 using SwitchifyPc.Windows.AppLifecycle;
 using SwitchifyPc.Windows.Bluetooth;
 using SwitchifyPc.Windows.CursorOverlay;
@@ -44,6 +45,7 @@ public partial class App : System.Windows.Application
     private MouseRepeatController? mouseRepeatController;
     private WindowsCursorOverlayNotifier? cursorOverlay;
     private DispatcherTimer? pairingExpiryTimer;
+    private AppThemeManager? themeManager;
     private bool isQuitting;
 
     protected override void OnStartup(StartupEventArgs e)
@@ -75,6 +77,8 @@ protected override void OnStartup(StartupEventArgs e)
         existingInstanceSignal.Start(
             () => Dispatcher.BeginInvoke(ShowMainWindow),
             () => Dispatcher.BeginInvoke(QuitApplication));
+        themeManager = AppThemeManager.ForCurrentApplication(new WindowsAppThemeProvider());
+        themeManager.Start();
         updateService = CreateUpdateService();
         pairingApprovalManager = CreatePairingApprovalManager();
         bluetoothStatusTracker = new BluetoothStatusTracker(onStatusChanged: UpdateBluetoothState);
@@ -113,6 +117,8 @@ protected override void OnExit(ExitEventArgs e)
         bluetoothServer = null;
         cursorOverlay?.Dispose();
         cursorOverlay = null;
+        themeManager?.Dispose();
+        themeManager = null;
         commandExecutor = null;
         bluetoothFrameProcessor = null;
         bluetoothStatusTracker = null;
diff --git a/src/SwitchifyPc.App/Chrome/SwitchifyTitleBar.xaml b/src/SwitchifyPc.App/Chrome/SwitchifyTitleBar.xaml
index c1e9948..605dc3d 100644
--- a/src/SwitchifyPc.App/Chrome/SwitchifyTitleBar.xaml
+++ b/src/SwitchifyPc.App/Chrome/SwitchifyTitleBar.xaml
@@ -3,8 +3,8 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:shell="clr-namespace:System.Windows.Shell;assembly=PresentationFramework"
              Height="44"
-             Background="#D32F2F"
-             Foreground="White"
+             Background="{DynamicResource ChromeBackground}"
+             Foreground="{DynamicResource ChromeForeground}"
              shell:WindowChrome.IsHitTestVisibleInChrome="True"
              MouseLeftButtonDown="TitleBar_MouseLeftButtonDown">
     <UserControl.Resources>
@@ -16,7 +16,7 @@
             <Setter Property="Padding" Value="0" />
             <Setter Property="BorderThickness" Value="0" />
             <Setter Property="Background" Value="Transparent" />
-            <Setter Property="Foreground" Value="White" />
+            <Setter Property="Foreground" Value="{DynamicResource ChromeForeground}" />
             <Setter Property="FontSize" Value="15" />
             <Setter Property="FontFamily" Value="Segoe UI" />
             <Setter Property="Cursor" Value="Hand" />
@@ -31,10 +31,10 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="#B3261E" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource ChromeBackgroundHover}" />
                             </Trigger>
                             <Trigger Property="IsPressed" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="#8F1D18" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource ChromeBackgroundPressed}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.45" />
@@ -56,10 +56,10 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="#C42B1C" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource ChromeCloseHover}" />
                             </Trigger>
                             <Trigger Property="IsPressed" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="#8F1D18" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource ChromeClosePressed}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.45" />
@@ -90,7 +90,7 @@
                        TextTrimming="CharacterEllipsis"
                        FontSize="13"
                        FontWeight="SemiBold"
-                       Foreground="White" />
+                       Foreground="{DynamicResource ChromeForeground}" />
         </StackPanel>
 
         <StackPanel Grid.Column="1"
diff --git a/src/SwitchifyPc.App/MainWindow.xaml b/src/SwitchifyPc.App/MainWindow.xaml
index 07134ae..0a2b591 100644
--- a/src/SwitchifyPc.App/MainWindow.xaml
+++ b/src/SwitchifyPc.App/MainWindow.xaml
@@ -14,7 +14,7 @@
         Width="920"
         Icon="Assets/icon.ico"
         FontFamily="Segoe UI"
-        Background="#D32F2F"
+        Background="{DynamicResource ChromeBackground}"
         WindowStyle="None"
         WindowStartupLocation="CenterScreen"
         d:DataContext="{d:DesignInstance Type=ui:MainWindowViewModel, IsDesignTimeCreatable=True}">
@@ -29,26 +29,13 @@
     <Window.Resources>
         <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
 
-        <SolidColorBrush x:Key="BrandPrimary" Color="#D32F2F" />
-        <SolidColorBrush x:Key="BrandPrimaryHover" Color="#B3261E" />
-        <SolidColorBrush x:Key="Surface" Color="#FFFFFF" />
-        <SolidColorBrush x:Key="SurfaceMuted" Color="#F3F2F6" />
-        <SolidColorBrush x:Key="Text" Color="#1C1B1F" />
-        <SolidColorBrush x:Key="TextMuted" Color="#49454F" />
-        <SolidColorBrush x:Key="BorderColor" Color="#E2E0E8" />
-        <SolidColorBrush x:Key="StatusOk" Color="#2E7D32" />
-        <SolidColorBrush x:Key="StatusWarn" Color="#C49A2C" />
-        <SolidColorBrush x:Key="StatusError" Color="#BA1A1A" />
-        <SolidColorBrush x:Key="AccentContainer" Color="#FFDAD6" />
-        <SolidColorBrush x:Key="OnAccentContainer" Color="#410002" />
-
         <Style TargetType="Button">
             <Setter Property="MinHeight" Value="40" />
             <Setter Property="Padding" Value="16,0" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
             <Setter Property="Template">
@@ -67,8 +54,8 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource SurfaceMuted}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource SurfaceMuted}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.55" />
@@ -82,10 +69,10 @@
         <Style x:Key="PrimaryButton" TargetType="Button">
             <Setter Property="MinHeight" Value="40" />
             <Setter Property="Padding" Value="16,0" />
-            <Setter Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
             <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="Background" Value="{StaticResource BrandPrimary}" />
-            <Setter Property="Foreground" Value="White" />
+            <Setter Property="Background" Value="{DynamicResource BrandPrimary}" />
+            <Setter Property="Foreground" Value="{DynamicResource ChromeForeground}" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
             <Setter Property="Template">
@@ -104,8 +91,8 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource BrandPrimaryHover}" />
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimaryHover}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource BrandPrimaryHover}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimaryHover}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.55" />
@@ -117,8 +104,8 @@
         </Style>
 
         <Style x:Key="MainCard" TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
             <Setter Property="CornerRadius" Value="16" />
             <Setter Property="Padding" Value="32" />
@@ -128,14 +115,14 @@
                                       Direction="270"
                                       Opacity="0.08"
                                       ShadowDepth="8"
-                                      Color="#1C1B1F" />
+                                      Color="Black" />
                 </Setter.Value>
             </Setter>
         </Style>
 
         <Style x:Key="SubtlePanel" TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource SurfaceMuted}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource SurfaceMuted}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
             <Setter Property="CornerRadius" Value="10" />
             <Setter Property="Padding" Value="12" />
@@ -144,20 +131,20 @@
         <Style x:Key="StatusPanel" TargetType="Border" BasedOn="{StaticResource SubtlePanel}">
             <Style.Triggers>
                 <DataTrigger Binding="{Binding StatusTone}" Value="ready">
-                    <Setter Property="BorderBrush" Value="#8BB88E" />
+                    <Setter Property="BorderBrush" Value="{DynamicResource StatusOk}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusTone}" Value="working">
-                    <Setter Property="BorderBrush" Value="#D8C06B" />
+                    <Setter Property="BorderBrush" Value="{DynamicResource StatusWarn}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusTone}" Value="error">
-                    <Setter Property="BorderBrush" Value="#D08A8A" />
+                    <Setter Property="BorderBrush" Value="{DynamicResource StatusError}" />
                 </DataTrigger>
             </Style.Triggers>
         </Style>
 
         <Style x:Key="StatusBadge" TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
             <Setter Property="CornerRadius" Value="8" />
             <Setter Property="Padding" Value="10,8" />
@@ -168,19 +155,19 @@
         <Style x:Key="StatusDot" TargetType="Ellipse">
             <Setter Property="Width" Value="9" />
             <Setter Property="Height" Value="9" />
-            <Setter Property="Fill" Value="{StaticResource TextMuted}" />
+            <Setter Property="Fill" Value="{DynamicResource TextMuted}" />
             <Style.Triggers>
                 <DataTrigger Binding="{Binding StatusBadgeTone}" Value="ready">
-                    <Setter Property="Fill" Value="{StaticResource StatusOk}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusOk}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusBadgeTone}" Value="connected">
-                    <Setter Property="Fill" Value="{StaticResource StatusOk}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusOk}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusBadgeTone}" Value="waiting">
-                    <Setter Property="Fill" Value="{StaticResource StatusWarn}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusWarn}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusBadgeTone}" Value="error">
-                    <Setter Property="Fill" Value="{StaticResource StatusError}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusError}" />
                 </DataTrigger>
             </Style.Triggers>
         </Style>
@@ -188,31 +175,31 @@
         <Style x:Key="PrimaryStatusDot" TargetType="Ellipse">
             <Setter Property="Width" Value="10" />
             <Setter Property="Height" Value="10" />
-            <Setter Property="Fill" Value="{StaticResource StatusOk}" />
+            <Setter Property="Fill" Value="{DynamicResource StatusOk}" />
             <Style.Triggers>
                 <DataTrigger Binding="{Binding StatusTone}" Value="working">
-                    <Setter Property="Fill" Value="{StaticResource StatusWarn}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusWarn}" />
                 </DataTrigger>
                 <DataTrigger Binding="{Binding StatusTone}" Value="error">
-                    <Setter Property="Fill" Value="{StaticResource StatusError}" />
+                    <Setter Property="Fill" Value="{DynamicResource StatusError}" />
                 </DataTrigger>
             </Style.Triggers>
         </Style>
 
         <Style x:Key="DetailLabel" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource TextMuted}" />
+            <Setter Property="Foreground" Value="{DynamicResource TextMuted}" />
             <Setter Property="FontSize" Value="12" />
             <Setter Property="FontWeight" Value="Bold" />
         </Style>
 
         <Style x:Key="DetailValue" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontSize" Value="13" />
             <Setter Property="TextWrapping" Value="Wrap" />
         </Style>
 
         <Style x:Key="MutedText" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource TextMuted}" />
+            <Setter Property="Foreground" Value="{DynamicResource TextMuted}" />
             <Setter Property="FontSize" Value="14" />
             <Setter Property="LineHeight" Value="21" />
             <Setter Property="TextWrapping" Value="Wrap" />
@@ -224,7 +211,7 @@
         </Style>
     </Window.Resources>
 
-    <Grid Background="#D32F2F">
+    <Grid Background="{DynamicResource ChromeBackground}">
         <Grid.RowDefinitions>
             <RowDefinition Height="44" />
             <RowDefinition Height="*" />
@@ -234,9 +221,9 @@
                                   TitleText="Switchify PC"
                                   ShowMinimizeButton="True" />
 
-        <Grid Grid.Row="1" Background="#D32F2F">
+        <Grid Grid.Row="1" Background="{DynamicResource ChromeBackground}">
             <Border Margin="0,96,0,0"
-                    Background="#F5F4F7" />
+                    Background="{DynamicResource AppBackground}" />
             <Grid Margin="24">
                 <Border HorizontalAlignment="Stretch"
                 VerticalAlignment="Stretch"
@@ -252,13 +239,13 @@
 
                         <StackPanel>
                             <TextBlock Text="Desktop companion"
-                                       Foreground="{StaticResource TextMuted}"
+                                       Foreground="{DynamicResource TextMuted}"
                                        FontSize="12"
                                        FontWeight="Bold"
                                        TextOptions.TextFormattingMode="Display" />
                             <TextBlock Margin="0,6,0,0"
                                        Text="{Binding AppTitle}"
-                                       Foreground="{StaticResource Text}"
+                                       Foreground="{DynamicResource Text}"
                                        FontSize="30"
                                        FontWeight="Bold" />
                         </StackPanel>
@@ -281,7 +268,7 @@
                                                Margin="8,0,0,0"
                                                VerticalAlignment="Center"
                                                Text="{Binding StatusBadgeLabel}"
-                                               Foreground="{StaticResource Text}"
+                                               Foreground="{DynamicResource Text}"
                                                FontSize="12"
                                                FontWeight="SemiBold" />
                                 </Grid>
@@ -294,7 +281,7 @@
                         <StackPanel>
                             <TextBlock Text="{Binding StatusTitle}"
                                        TextAlignment="Center"
-                                       Foreground="{StaticResource Text}"
+                                       Foreground="{DynamicResource Text}"
                                        FontSize="23"
                                        FontWeight="Bold"
                                        TextWrapping="Wrap" />
@@ -313,7 +300,7 @@
                                     <TextBlock Margin="10,0,0,0"
                                                VerticalAlignment="Center"
                                                Text="{Binding BluetoothStatus}"
-                                               Foreground="{StaticResource Text}"
+                                               Foreground="{DynamicResource Text}"
                                                FontSize="14"
                                                FontWeight="Bold" />
                                 </StackPanel>
@@ -328,7 +315,7 @@
                                 <StackPanel>
                                     <TextBlock Text="Device connected"
                                                TextAlignment="Center"
-                                               Foreground="{StaticResource Text}"
+                                               Foreground="{DynamicResource Text}"
                                                FontSize="14"
                                                FontWeight="Bold" />
                                     <TextBlock Margin="0,4,0,0"
@@ -360,7 +347,7 @@
                                 <TextBlock Text="Get Switchify for Android"
                                            FontSize="16"
                                            FontWeight="Bold"
-                                           Foreground="{StaticResource Text}" />
+                                           Foreground="{DynamicResource Text}" />
                                 <TextBlock Margin="0,6,0,0"
                                            Text="Install the Android app, then open it near this PC to pair over Bluetooth."
                                            Style="{StaticResource MutedText}" />
@@ -378,8 +365,8 @@
                             <Border Grid.Column="1"
                                     Margin="20,0,0,0"
                                     Padding="8"
-                                    Background="{StaticResource Surface}"
-                                    BorderBrush="{StaticResource BorderColor}"
+                                    Background="{DynamicResource Surface}"
+                                    BorderBrush="{DynamicResource BorderColor}"
                                     BorderThickness="1"
                                     CornerRadius="8">
                                 <Image Width="132"
@@ -402,7 +389,7 @@
                                 <TextBlock Text="{Binding UpdateBannerTitle}"
                                            FontSize="15"
                                            FontWeight="Bold"
-                                           Foreground="{StaticResource Text}" />
+                                           Foreground="{DynamicResource Text}" />
                                 <TextBlock Margin="0,4,0,0"
                                            Text="{Binding UpdateBannerBody}"
                                            Style="{StaticResource MutedText}" />
@@ -415,8 +402,8 @@
                     </Border>
 
                     <Border Margin="0,0,0,20"
-                            Background="{StaticResource AccentContainer}"
-                            BorderBrush="{StaticResource BrandPrimary}"
+                            Background="{DynamicResource AccentContainer}"
+                            BorderBrush="{DynamicResource BrandPrimary}"
                             BorderThickness="1"
                             CornerRadius="10"
                             Padding="16"
@@ -425,17 +412,17 @@
                             <TextBlock Text="Pairing requests"
                                        FontSize="18"
                                        FontWeight="Bold"
-                                       Foreground="{StaticResource OnAccentContainer}" />
+                                       Foreground="{DynamicResource OnAccentContainer}" />
                             <ItemsControl Margin="0,12,0,0"
                                           ItemsSource="{Binding PairingApprovals}">
                                 <ItemsControl.ItemTemplate>
                                     <DataTemplate>
                                         <Border Margin="0,0,0,10"
                                                 Padding="12"
-                                                BorderBrush="{StaticResource BrandPrimary}"
+                                                BorderBrush="{DynamicResource BrandPrimary}"
                                                 BorderThickness="1"
                                                 CornerRadius="8"
-                                                Background="White">
+                                                Background="{DynamicResource Surface}">
                                             <Grid>
                                                 <Grid.ColumnDefinitions>
                                                     <ColumnDefinition Width="*" />
@@ -445,10 +432,10 @@
                                                     <TextBlock Text="{Binding DeviceName}"
                                                                FontSize="14"
                                                                FontWeight="Bold"
-                                                               Foreground="{StaticResource Text}" />
+                                                               Foreground="{DynamicResource Text}" />
                                                     <TextBlock Margin="0,4,0,0"
                                                                Text="{Binding VerificationCode, StringFormat=Verification code {0}}"
-                                                               Foreground="{StaticResource Text}"
+                                                               Foreground="{DynamicResource Text}"
                                                                FontSize="13"
                                                                FontWeight="Bold" />
                                                 </StackPanel>
@@ -476,7 +463,7 @@
                     </Border>
 
                     <Expander Header="Troubleshooting"
-                              Foreground="{StaticResource Text}"
+                              Foreground="{DynamicResource Text}"
                               FontWeight="Bold">
                         <Grid Margin="0,14,0,0">
                             <Grid.ColumnDefinitions>
diff --git a/src/SwitchifyPc.App/SettingsWindow.xaml b/src/SwitchifyPc.App/SettingsWindow.xaml
index c6e586d..1599a7b 100644
--- a/src/SwitchifyPc.App/SettingsWindow.xaml
+++ b/src/SwitchifyPc.App/SettingsWindow.xaml
@@ -15,7 +15,7 @@
         ResizeMode="NoResize"
         Icon="Assets/icon.ico"
         FontFamily="Segoe UI"
-        Background="#D32F2F"
+        Background="{DynamicResource ChromeBackground}"
         WindowStyle="None"
         WindowStartupLocation="CenterScreen"
         d:DataContext="{d:DesignInstance Type=ui:SettingsViewModel, IsDesignTimeCreatable=True}">
@@ -30,21 +30,13 @@
     <Window.Resources>
         <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
 
-        <SolidColorBrush x:Key="BrandPrimary" Color="#D32F2F" />
-        <SolidColorBrush x:Key="BrandPrimaryHover" Color="#B3261E" />
-        <SolidColorBrush x:Key="Surface" Color="#FFFFFF" />
-        <SolidColorBrush x:Key="SurfaceMuted" Color="#F3F2F6" />
-        <SolidColorBrush x:Key="Text" Color="#1C1B1F" />
-        <SolidColorBrush x:Key="TextMuted" Color="#49454F" />
-        <SolidColorBrush x:Key="BorderColor" Color="#E2E0E8" />
-
         <Style TargetType="Button">
             <Setter Property="MinHeight" Value="38" />
             <Setter Property="Padding" Value="14,0" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
             <Setter Property="Template">
@@ -63,8 +55,8 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource SurfaceMuted}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource SurfaceMuted}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.55" />
@@ -78,10 +70,10 @@
         <Style x:Key="PrimaryButton" TargetType="Button">
             <Setter Property="MinHeight" Value="38" />
             <Setter Property="Padding" Value="14,0" />
-            <Setter Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
             <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="Background" Value="{StaticResource BrandPrimary}" />
-            <Setter Property="Foreground" Value="White" />
+            <Setter Property="Background" Value="{DynamicResource BrandPrimary}" />
+            <Setter Property="Foreground" Value="{DynamicResource ChromeForeground}" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
             <Setter Property="Template">
@@ -100,8 +92,8 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource BrandPrimaryHover}" />
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimaryHover}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource BrandPrimaryHover}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimaryHover}" />
                             </Trigger>
                             <Trigger Property="IsEnabled" Value="False">
                                 <Setter TargetName="Root" Property="Opacity" Value="0.55" />
@@ -113,48 +105,48 @@
         </Style>
 
         <Style x:Key="PanelBorder" TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
             <Setter Property="CornerRadius" Value="12" />
             <Setter Property="Padding" Value="18" />
         </Style>
 
         <Style x:Key="SubtlePanel" TargetType="Border">
-            <Setter Property="Background" Value="{StaticResource SurfaceMuted}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource SurfaceMuted}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
             <Setter Property="CornerRadius" Value="10" />
             <Setter Property="Padding" Value="12" />
         </Style>
 
         <Style x:Key="SectionTitle" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontSize" Value="17" />
             <Setter Property="FontWeight" Value="Bold" />
         </Style>
 
         <Style x:Key="MutedText" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource TextMuted}" />
+            <Setter Property="Foreground" Value="{DynamicResource TextMuted}" />
             <Setter Property="FontSize" Value="13" />
             <Setter Property="LineHeight" Value="19" />
             <Setter Property="TextWrapping" Value="Wrap" />
         </Style>
 
         <Style x:Key="DetailLabel" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource TextMuted}" />
+            <Setter Property="Foreground" Value="{DynamicResource TextMuted}" />
             <Setter Property="FontSize" Value="12" />
             <Setter Property="FontWeight" Value="Bold" />
         </Style>
 
         <Style x:Key="DetailValue" TargetType="TextBlock">
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontSize" Value="13" />
             <Setter Property="TextWrapping" Value="Wrap" />
         </Style>
 
         <Style TargetType="CheckBox">
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontSize" Value="13" />
             <Setter Property="VerticalContentAlignment" Value="Center" />
         </Style>
@@ -163,7 +155,7 @@
             <Setter Property="MinHeight" Value="40" />
             <Setter Property="Margin" Value="0,0,0,4" />
             <Setter Property="Padding" Value="12,0" />
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
             <Setter Property="Template">
@@ -180,12 +172,12 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource SurfaceMuted}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource SurfaceMuted}" />
                             </Trigger>
                             <Trigger Property="IsChecked" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="{StaticResource Surface}" />
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
-                                <Setter Property="Foreground" Value="{StaticResource BrandPrimary}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource Surface}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
+                                <Setter Property="Foreground" Value="{DynamicResource BrandPrimary}" />
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
@@ -197,10 +189,10 @@
             <Setter Property="MinHeight" Value="36" />
             <Setter Property="Margin" Value="0,0,6,0" />
             <Setter Property="Padding" Value="12,0" />
-            <Setter Property="Background" Value="{StaticResource Surface}" />
-            <Setter Property="BorderBrush" Value="{StaticResource BorderColor}" />
+            <Setter Property="Background" Value="{DynamicResource Surface}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource BorderColor}" />
             <Setter Property="BorderThickness" Value="1" />
-            <Setter Property="Foreground" Value="{StaticResource Text}" />
+            <Setter Property="Foreground" Value="{DynamicResource Text}" />
             <Setter Property="FontSize" Value="12" />
             <Setter Property="FontWeight" Value="Bold" />
             <Setter Property="Cursor" Value="Hand" />
@@ -219,12 +211,12 @@
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsMouseOver" Value="True">
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
                             </Trigger>
                             <Trigger Property="IsChecked" Value="True">
-                                <Setter TargetName="Root" Property="Background" Value="#FFF1F1" />
-                                <Setter TargetName="Root" Property="BorderBrush" Value="{StaticResource BrandPrimary}" />
-                                <Setter Property="Foreground" Value="{StaticResource BrandPrimary}" />
+                                <Setter TargetName="Root" Property="Background" Value="{DynamicResource SegmentSelectedBackground}" />
+                                <Setter TargetName="Root" Property="BorderBrush" Value="{DynamicResource BrandPrimary}" />
+                                <Setter Property="Foreground" Value="{DynamicResource BrandPrimary}" />
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
@@ -241,12 +233,12 @@
             <Setter Property="Height" Value="10" />
             <Setter Property="Minimum" Value="0" />
             <Setter Property="Maximum" Value="100" />
-            <Setter Property="Foreground" Value="{StaticResource BrandPrimary}" />
-            <Setter Property="Background" Value="{StaticResource BorderColor}" />
+            <Setter Property="Foreground" Value="{DynamicResource BrandPrimary}" />
+            <Setter Property="Background" Value="{DynamicResource BorderColor}" />
         </Style>
     </Window.Resources>
 
-    <Grid Background="#D32F2F">
+    <Grid Background="{DynamicResource ChromeBackground}">
         <Grid.RowDefinitions>
             <RowDefinition Height="44" />
             <RowDefinition Height="Auto" />
@@ -260,16 +252,16 @@
         <Border Grid.Row="1"
                 Grid.RowSpan="2"
                 Margin="0,80,0,0"
-                Background="#F5F4F7" />
+                Background="{DynamicResource AppBackground}" />
 
         <StackPanel Grid.Row="1" Margin="24,24,24,0">
             <TextBlock Text="Settings"
                        FontSize="18"
                        FontWeight="Bold"
-                       Foreground="White" />
+                       Foreground="{DynamicResource ChromeForeground}" />
             <TextBlock Margin="0,4,0,18"
                        Text="Tune how Switchify starts, connects, and controls this PC."
-                       Foreground="#FDE8E8"
+                       Foreground="{DynamicResource ChromeSubtleForeground}"
                        Style="{StaticResource MutedText}" />
         </StackPanel>
 
@@ -280,8 +272,8 @@
                 <ColumnDefinition Width="*" />
             </Grid.ColumnDefinitions>
 
-            <Border Background="{StaticResource Surface}"
-                    BorderBrush="{StaticResource BorderColor}"
+            <Border Background="{DynamicResource Surface}"
+                    BorderBrush="{DynamicResource BorderColor}"
                     BorderThickness="1"
                     CornerRadius="12"
                     Padding="8"
@@ -353,7 +345,7 @@
                                                         <TextBlock Text="{Binding DeviceName}"
                                                                    FontSize="14"
                                                                    FontWeight="Bold"
-                                                                   Foreground="{StaticResource Text}" />
+                                                                   Foreground="{DynamicResource Text}" />
                                                         <TextBlock Margin="0,4,0,0"
                                                                    Text="{Binding LastSeenAt, StringFormat=Last seen {0}}"
                                                                    Style="{StaticResource MutedText}" />
@@ -677,7 +669,7 @@
                                                              Checked="CursorOverlayColorWhite_Checked"
                                                              Style="{StaticResource SegmentRadio}">
                                                     <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
-                                                        <Border Width="12" Height="12" CornerRadius="6" Background="#FFFFFF" BorderBrush="{StaticResource BorderColor}" BorderThickness="1" />
+                                                        <Border Width="12" Height="12" CornerRadius="6" Background="#FFFFFF" BorderBrush="{DynamicResource BorderColor}" BorderThickness="1" />
                                                         <TextBlock Margin="6,0,0,0" Text="White" />
                                                     </StackPanel>
                                                 </RadioButton>
diff --git a/src/SwitchifyPc.App/Themes/AppTheme.cs b/src/SwitchifyPc.App/Themes/AppTheme.cs
new file mode 100644
index 0000000..2fb9b77
--- /dev/null
+++ b/src/SwitchifyPc.App/Themes/AppTheme.cs
@@ -0,0 +1,158 @@
+using System.Windows;
+using System.Windows.Threading;
+using System.IO.Packaging;
+using Microsoft.Win32;
+using WpfApplication = System.Windows.Application;
+
+namespace SwitchifyPc.App.Themes;
+
+public enum AppTheme
+{
+    Light,
+    Dark
+}
+
+public interface IAppThemeProvider
+{
+    AppTheme GetCurrentTheme();
+}
+
+public sealed class WindowsAppThemeProvider : IAppThemeProvider
+{
+    private const string PersonalizeRegistryPath = @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize";
+    private const string AppsUseLightThemeValueName = "AppsUseLightTheme";
+    private readonly Func<object?> readAppsUseLightTheme;
+
+    public WindowsAppThemeProvider(Func<object?>? readAppsUseLightTheme = null)
+    {
+        this.readAppsUseLightTheme = readAppsUseLightTheme ?? (() =>
+            Registry.GetValue(PersonalizeRegistryPath, AppsUseLightThemeValueName, 1));
+    }
+
+    public AppTheme GetCurrentTheme()
+    {
+        try
+        {
+            return readAppsUseLightTheme() switch
+            {
+                int value when value == 0 => AppTheme.Dark,
+                long value when value == 0 => AppTheme.Dark,
+                string value when string.Equals(value, "0", StringComparison.Ordinal) => AppTheme.Dark,
+                _ => AppTheme.Light
+            };
+        }
+        catch
+        {
+            return AppTheme.Light;
+        }
+    }
+}
+
+public sealed class AppThemeManager : IDisposable
+{
+    public const string SwitchifyThemeResourceKey = "__SwitchifyTheme";
+    public static readonly Uri LightThemeUri = PackUriHelper.Create(
+        new Uri("application:///", UriKind.Absolute),
+        new Uri("/Themes/Theme.Light.xaml", UriKind.Relative));
+    public static readonly Uri DarkThemeUri = PackUriHelper.Create(
+        new Uri("application:///", UriKind.Absolute),
+        new Uri("/Themes/Theme.Dark.xaml", UriKind.Relative));
+
+    private readonly ResourceDictionary resources;
+    private readonly Dispatcher dispatcher;
+    private readonly IAppThemeProvider themeProvider;
+    private readonly Func<AppTheme, ResourceDictionary> createDictionary;
+    private bool isListening;
+
+    public AppThemeManager(
+        ResourceDictionary resources,
+        Dispatcher dispatcher,
+        IAppThemeProvider themeProvider,
+        Func<AppTheme, ResourceDictionary>? createDictionary = null)
+    {
+        this.resources = resources;
+        this.dispatcher = dispatcher;
+        this.themeProvider = themeProvider;
+        this.createDictionary = createDictionary ?? CreateThemeDictionary;
+    }
+
+    public static AppThemeManager ForCurrentApplication(IAppThemeProvider themeProvider)
+    {
+        WpfApplication application = WpfApplication.Current ?? throw new InvalidOperationException("No WPF application is available.");
+        return new AppThemeManager(application.Resources, application.Dispatcher, themeProvider);
+    }
+
+    public void Start()
+    {
+        ApplyCurrentTheme();
+        if (isListening) return;
+
+        SystemEvents.UserPreferenceChanged += SystemEvents_UserPreferenceChanged;
+        isListening = true;
+    }
+
+    public void ApplyCurrentTheme()
+    {
+        ApplyTheme(themeProvider.GetCurrentTheme());
+    }
+
+    public void ApplyTheme(AppTheme theme)
+    {
+        ResourceDictionary next;
+        try
+        {
+            next = createDictionary(theme);
+        }
+        catch
+        {
+            return;
+        }
+
+        next[SwitchifyThemeResourceKey] = theme.ToString();
+
+        for (int index = resources.MergedDictionaries.Count - 1; index >= 0; index--)
+        {
+            ResourceDictionary dictionary = resources.MergedDictionaries[index];
+            if (IsSwitchifyThemeDictionary(dictionary))
+            {
+                resources.MergedDictionaries.RemoveAt(index);
+            }
+        }
+
+        resources.MergedDictionaries.Add(next);
+    }
+
+    public void Dispose()
+    {
+        if (!isListening) return;
+
+        SystemEvents.UserPreferenceChanged -= SystemEvents_UserPreferenceChanged;
+        isListening = false;
+    }
+
+    private void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
+    {
+        if (dispatcher.CheckAccess())
+        {
+            ApplyCurrentTheme();
+            return;
+        }
+
+        dispatcher.BeginInvoke(ApplyCurrentTheme);
+    }
+
+    private static ResourceDictionary CreateThemeDictionary(AppTheme theme)
+    {
+        return new ResourceDictionary
+        {
+            Source = theme == AppTheme.Dark ? DarkThemeUri : LightThemeUri
+        };
+    }
+
+    private static bool IsSwitchifyThemeDictionary(ResourceDictionary dictionary)
+    {
+        return dictionary.Source is not null &&
+            (dictionary.Source == LightThemeUri || dictionary.Source == DarkThemeUri) ||
+            dictionary.Contains(SwitchifyThemeResourceKey);
+    }
+}
diff --git a/src/SwitchifyPc.App/Themes/Theme.Dark.xaml b/src/SwitchifyPc.App/Themes/Theme.Dark.xaml
new file mode 100644
index 0000000..79123ab
--- /dev/null
+++ b/src/SwitchifyPc.App/Themes/Theme.Dark.xaml
@@ -0,0 +1,25 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="BrandPrimary" Color="#D65A52" />
+    <SolidColorBrush x:Key="BrandPrimaryHover" Color="#E06B63" />
+    <SolidColorBrush x:Key="ChromeBackground" Color="#A8231C" />
+    <SolidColorBrush x:Key="ChromeBackgroundHover" Color="#8F1D18" />
+    <SolidColorBrush x:Key="ChromeBackgroundPressed" Color="#6F1511" />
+    <SolidColorBrush x:Key="ChromeCloseHover" Color="#C42B1C" />
+    <SolidColorBrush x:Key="ChromeClosePressed" Color="#8F1D18" />
+    <SolidColorBrush x:Key="ChromeForeground" Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ChromeSubtleForeground" Color="#FFDAD6" />
+    <SolidColorBrush x:Key="AppBackground" Color="#141318" />
+    <SolidColorBrush x:Key="Surface" Color="#1F1F23" />
+    <SolidColorBrush x:Key="SurfaceMuted" Color="#2A292F" />
+    <SolidColorBrush x:Key="Text" Color="#F4EFF4" />
+    <SolidColorBrush x:Key="TextMuted" Color="#CAC4D0" />
+    <SolidColorBrush x:Key="BorderColor" Color="#45424B" />
+    <SolidColorBrush x:Key="StatusOk" Color="#81C784" />
+    <SolidColorBrush x:Key="StatusWarn" Color="#E0B84D" />
+    <SolidColorBrush x:Key="StatusError" Color="#FFB4AB" />
+    <SolidColorBrush x:Key="AccentContainer" Color="#5B1B18" />
+    <SolidColorBrush x:Key="OnAccentContainer" Color="#FFDAD6" />
+    <SolidColorBrush x:Key="SegmentSelectedBackground" Color="#3B2424" />
+    <SolidColorBrush x:Key="ShadowColor" Color="#000000" />
+</ResourceDictionary>
diff --git a/src/SwitchifyPc.App/Themes/Theme.Light.xaml b/src/SwitchifyPc.App/Themes/Theme.Light.xaml
new file mode 100644
index 0000000..14f1ab1
--- /dev/null
+++ b/src/SwitchifyPc.App/Themes/Theme.Light.xaml
@@ -0,0 +1,25 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="BrandPrimary" Color="#D32F2F" />
+    <SolidColorBrush x:Key="BrandPrimaryHover" Color="#B3261E" />
+    <SolidColorBrush x:Key="ChromeBackground" Color="#D32F2F" />
+    <SolidColorBrush x:Key="ChromeBackgroundHover" Color="#B3261E" />
+    <SolidColorBrush x:Key="ChromeBackgroundPressed" Color="#8F1D18" />
+    <SolidColorBrush x:Key="ChromeCloseHover" Color="#C42B1C" />
+    <SolidColorBrush x:Key="ChromeClosePressed" Color="#8F1D18" />
+    <SolidColorBrush x:Key="ChromeForeground" Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ChromeSubtleForeground" Color="#FDE8E8" />
+    <SolidColorBrush x:Key="AppBackground" Color="#F5F4F7" />
+    <SolidColorBrush x:Key="Surface" Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SurfaceMuted" Color="#F3F2F6" />
+    <SolidColorBrush x:Key="Text" Color="#1C1B1F" />
+    <SolidColorBrush x:Key="TextMuted" Color="#49454F" />
+    <SolidColorBrush x:Key="BorderColor" Color="#E2E0E8" />
+    <SolidColorBrush x:Key="StatusOk" Color="#2E7D32" />
+    <SolidColorBrush x:Key="StatusWarn" Color="#C49A2C" />
+    <SolidColorBrush x:Key="StatusError" Color="#BA1A1A" />
+    <SolidColorBrush x:Key="AccentContainer" Color="#FFDAD6" />
+    <SolidColorBrush x:Key="OnAccentContainer" Color="#410002" />
+    <SolidColorBrush x:Key="SegmentSelectedBackground" Color="#FFF1F1" />
+    <SolidColorBrush x:Key="ShadowColor" Color="#1C1B1F" />
+</ResourceDictionary>
diff --git a/src/SwitchifyPc.Tests/AppThemeManagerTests.cs b/src/SwitchifyPc.Tests/AppThemeManagerTests.cs
new file mode 100644
index 0000000..0141e23
--- /dev/null
+++ b/src/SwitchifyPc.Tests/AppThemeManagerTests.cs
@@ -0,0 +1,122 @@
+using System.Windows;
+using System.Windows.Media;
+using SwitchifyPc.App.Themes;
+
+namespace SwitchifyPc.Tests;
+
+[Collection(WpfTestCollection.Name)]
+public sealed class AppThemeManagerTests
+{
+    [Fact]
+    public void AppliesLightThemeDictionary()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary resources = new();
+            AppThemeManager manager = Manager(resources, AppTheme.Light);
+
+            manager.ApplyCurrentTheme();
+
+            ResourceDictionary dictionary = Assert.Single(resources.MergedDictionaries);
+            Assert.Equal(AppTheme.Light.ToString(), dictionary[AppThemeManager.SwitchifyThemeResourceKey]);
+        });
+    }
+
+    [Fact]
+    public void AppliesDarkThemeDictionary()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary resources = new();
+            AppThemeManager manager = Manager(resources, AppTheme.Dark);
+
+            manager.ApplyCurrentTheme();
+
+            ResourceDictionary dictionary = Assert.Single(resources.MergedDictionaries);
+            Assert.Equal(AppTheme.Dark.ToString(), dictionary[AppThemeManager.SwitchifyThemeResourceKey]);
+        });
+    }
+
+    [Fact]
+    public void SwitchingThemeReplacesPreviousThemeDictionary()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary resources = new();
+            MutableThemeProvider provider = new(AppTheme.Light);
+            AppThemeManager manager = new(resources, System.Windows.Threading.Dispatcher.CurrentDispatcher, provider, FakeDictionary);
+
+            manager.ApplyCurrentTheme();
+            provider.Theme = AppTheme.Dark;
+            manager.ApplyCurrentTheme();
+
+            ResourceDictionary dictionary = Assert.Single(resources.MergedDictionaries);
+            Assert.Equal(AppTheme.Dark.ToString(), dictionary[AppThemeManager.SwitchifyThemeResourceKey]);
+        });
+    }
+
+    [Fact]
+    public void DoesNotRemoveNonThemeMergedDictionaries()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary resources = new();
+            ResourceDictionary unrelated = new()
+            {
+                ["OtherBrush"] = new SolidColorBrush(Colors.Magenta)
+            };
+            resources.MergedDictionaries.Add(unrelated);
+            AppThemeManager manager = Manager(resources, AppTheme.Dark);
+
+            manager.ApplyCurrentTheme();
+
+            Assert.Contains(unrelated, resources.MergedDictionaries);
+            Assert.Contains(resources.MergedDictionaries, dictionary =>
+                dictionary.Contains(AppThemeManager.SwitchifyThemeResourceKey) &&
+                string.Equals(dictionary[AppThemeManager.SwitchifyThemeResourceKey]?.ToString(), AppTheme.Dark.ToString(), StringComparison.Ordinal));
+        });
+    }
+
+    private static AppThemeManager Manager(ResourceDictionary resources, AppTheme theme)
+    {
+        return new AppThemeManager(
+            resources,
+            System.Windows.Threading.Dispatcher.CurrentDispatcher,
+            new MutableThemeProvider(theme),
+            FakeDictionary);
+    }
+
+    private static ResourceDictionary FakeDictionary(AppTheme theme)
+    {
+        return new ResourceDictionary();
+    }
+
+    private static void RunOnSta(Action action)
+    {
+        Exception? exception = null;
+        Thread thread = new(() =>
+        {
+            try
+            {
+                action();
+            }
+            catch (Exception error)
+            {
+                exception = error;
+            }
+        });
+
+        thread.SetApartmentState(ApartmentState.STA);
+        thread.Start();
+        thread.Join();
+
+        if (exception is not null) throw exception;
+    }
+
+    private sealed class MutableThemeProvider(AppTheme theme) : IAppThemeProvider
+    {
+        public AppTheme Theme { get; set; } = theme;
+
+        public AppTheme GetCurrentTheme() => Theme;
+    }
+}
diff --git a/src/SwitchifyPc.Tests/ButtonStyleTests.cs b/src/SwitchifyPc.Tests/ButtonStyleTests.cs
index e4ea3cc..0eb40fc 100644
--- a/src/SwitchifyPc.Tests/ButtonStyleTests.cs
+++ b/src/SwitchifyPc.Tests/ButtonStyleTests.cs
@@ -16,6 +16,7 @@ public void MainWindowPrimaryButtonStyleUsesRedHoverBrush()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(SwitchifyPc.App.Themes.AppTheme.Light);
             MainWindow window = new();
             try
             {
@@ -33,6 +34,7 @@ public void SettingsWindowPrimaryButtonStyleUsesRedHoverBrush()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(SwitchifyPc.App.Themes.AppTheme.Light);
             SettingsWindow window = new();
             try
             {
@@ -50,7 +52,6 @@ private static void AssertPrimaryButtonStyleUsesRedHoverBrush(FrameworkElement e
         Style style = Assert.IsType<Style>(element.FindResource("PrimaryButton"));
         Assert.Null(style.BasedOn);
 
-        SolidColorBrush hoverBrush = Assert.IsType<SolidColorBrush>(element.FindResource("BrandPrimaryHover"));
         WpfControlTemplate template = Assert.IsType<WpfControlTemplate>(
             Assert.Single(style.Setters.OfType<Setter>(), setter => setter.Property == WpfControl.TemplateProperty).Value);
         Trigger hoverTrigger = Assert.IsType<Trigger>(
@@ -59,11 +60,17 @@ private static void AssertPrimaryButtonStyleUsesRedHoverBrush(FrameworkElement e
         Assert.Contains(hoverTrigger.Setters.OfType<Setter>(), setter =>
             setter.TargetName == "Root" &&
             setter.Property == WpfBorder.BackgroundProperty &&
-            ReferenceEquals(setter.Value, hoverBrush));
+            IsDynamicResource(setter.Value, "BrandPrimaryHover"));
         Assert.Contains(hoverTrigger.Setters.OfType<Setter>(), setter =>
             setter.TargetName == "Root" &&
             setter.Property == WpfBorder.BorderBrushProperty &&
-            ReferenceEquals(setter.Value, hoverBrush));
+            IsDynamicResource(setter.Value, "BrandPrimaryHover"));
+    }
+
+    private static bool IsDynamicResource(object value, string resourceKey)
+    {
+        return value is DynamicResourceExtension resource &&
+            string.Equals(resource.ResourceKey?.ToString(), resourceKey, StringComparison.Ordinal);
     }
 
     private static void RunOnSta(Action action)
diff --git a/src/SwitchifyPc.Tests/MainWindowTests.cs b/src/SwitchifyPc.Tests/MainWindowTests.cs
index 705524c..e8863b6 100644
--- a/src/SwitchifyPc.Tests/MainWindowTests.cs
+++ b/src/SwitchifyPc.Tests/MainWindowTests.cs
@@ -5,8 +5,10 @@
 using System.Windows.Media;
 using System.Windows.Shell;
 using SwitchifyPc.App;
+using SwitchifyPc.App.Themes;
 using SwitchifyPc.Core.Ui;
 using WpfButton = System.Windows.Controls.Button;
+using WpfColor = System.Windows.Media.Color;
 
 namespace SwitchifyPc.Tests;
 
@@ -18,6 +20,7 @@ public void MainWindowLoadsWithAndroidDownloadPrompt()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             MainWindowViewModel viewModel = new();
             viewModel.SetAndroidDownloadPromptState(dismissed: false, hasPairedDevices: false);
             MainWindow window = new(viewModel);
@@ -42,6 +45,7 @@ public void MainWindowUsesCustomChrome()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             MainWindow window = new(new MainWindowViewModel());
             try
             {
@@ -61,6 +65,30 @@ public void MainWindowUsesCustomChrome()
         });
     }
 
+    [Fact]
+    public void MainWindowLoadsWithDarkTheme()
+    {
+        RunOnSta(() =>
+        {
+            WpfTestApplication.ApplyTheme(AppTheme.Dark);
+            MainWindow window = new(new MainWindowViewModel());
+            try
+            {
+                window.Show();
+                window.UpdateLayout();
+
+                Assert.Equal(WindowStyle.None, window.WindowStyle);
+                Assert.Contains("Switchify PC", TextBlocks(window));
+                SolidColorBrush surface = Assert.IsType<SolidColorBrush>(window.FindResource("Surface"));
+                Assert.Equal(WpfColor.FromRgb(0x1F, 0x1F, 0x23), surface.Color);
+            }
+            finally
+            {
+                window.Close();
+            }
+        });
+    }
+
     private static void RunOnSta(Action action)
     {
         Exception? exception = null;
diff --git a/src/SwitchifyPc.Tests/SettingsWindowTests.cs b/src/SwitchifyPc.Tests/SettingsWindowTests.cs
index 41f79bb..49a7b07 100644
--- a/src/SwitchifyPc.Tests/SettingsWindowTests.cs
+++ b/src/SwitchifyPc.Tests/SettingsWindowTests.cs
@@ -5,9 +5,11 @@
 using System.Windows.Media;
 using System.Windows.Shell;
 using SwitchifyPc.App;
+using SwitchifyPc.App.Themes;
 using SwitchifyPc.Core.Ui;
 using SwitchifyPc.Core.Updates;
 using WpfButton = System.Windows.Controls.Button;
+using WpfColor = System.Windows.Media.Color;
 
 namespace SwitchifyPc.Tests;
 
@@ -19,6 +21,7 @@ public void SettingsWindowLoadsWithUpdateDownloadProgress()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SettingsViewModel viewModel = new();
             viewModel.SetUpdateState(UpdateState.CreateInitial("0.2.4") with
             {
@@ -47,6 +50,7 @@ public void SettingsWindowShowsSeparateMouseRepeatIntervals()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SettingsViewModel viewModel = new();
             SettingsWindow window = new(viewModel);
             try
@@ -73,6 +77,7 @@ public void SettingsWindowUsesCustomChrome()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SettingsWindow window = new(new SettingsViewModel());
             try
             {
@@ -93,6 +98,30 @@ public void SettingsWindowUsesCustomChrome()
         });
     }
 
+    [Fact]
+    public void SettingsWindowLoadsWithDarkTheme()
+    {
+        RunOnSta(() =>
+        {
+            WpfTestApplication.ApplyTheme(AppTheme.Dark);
+            SettingsWindow window = new(new SettingsViewModel());
+            try
+            {
+                window.Show();
+                window.UpdateLayout();
+
+                Assert.Contains("Switchify PC settings", TextBlocks(window));
+                Assert.Contains("Settings", TextBlocks(window));
+                SolidColorBrush appBackground = Assert.IsType<SolidColorBrush>(window.FindResource("AppBackground"));
+                Assert.Equal(WpfColor.FromRgb(0x14, 0x13, 0x18), appBackground.Color);
+            }
+            finally
+            {
+                window.Close();
+            }
+        });
+    }
+
     private static void RunOnSta(Action action)
     {
         Exception? exception = null;
diff --git a/src/SwitchifyPc.Tests/SwitchifyTitleBarTests.cs b/src/SwitchifyPc.Tests/SwitchifyTitleBarTests.cs
index 586833e..ab1c8f9 100644
--- a/src/SwitchifyPc.Tests/SwitchifyTitleBarTests.cs
+++ b/src/SwitchifyPc.Tests/SwitchifyTitleBarTests.cs
@@ -4,7 +4,9 @@
 using System.Windows.Controls;
 using System.Windows.Media;
 using SwitchifyPc.App.Chrome;
+using SwitchifyPc.App.Themes;
 using WpfButton = System.Windows.Controls.Button;
+using WpfColor = System.Windows.Media.Color;
 
 namespace SwitchifyPc.Tests;
 
@@ -16,6 +18,7 @@ public void ExposesTitleText()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SwitchifyTitleBar titleBar = new()
             {
                 TitleText = "Switchify PC test"
@@ -45,6 +48,7 @@ public void MinimizeButtonSetsParentWindowState()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SwitchifyTitleBar titleBar = new();
             Window window = new()
             {
@@ -74,6 +78,7 @@ public void CloseButtonInvokesParentWindowClose()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             bool closingCalled = false;
             SwitchifyTitleBar titleBar = new();
             Window window = new()
@@ -108,6 +113,7 @@ public void CanHideMinimizeButton()
     {
         RunOnSta(() =>
         {
+            WpfTestApplication.ApplyTheme(AppTheme.Light);
             SwitchifyTitleBar titleBar = new()
             {
                 ShowMinimizeButton = false
@@ -133,6 +139,37 @@ public void CanHideMinimizeButton()
         });
     }
 
+    [Fact]
+    public void UsesDarkChromeBackgroundResource()
+    {
+        RunOnSta(() =>
+        {
+            WpfTestApplication.ApplyTheme(AppTheme.Dark);
+            SwitchifyTitleBar titleBar = new()
+            {
+                TitleText = "Switchify PC dark"
+            };
+            Window window = new()
+            {
+                Content = titleBar,
+                Width = 320,
+                Height = 120
+            };
+            try
+            {
+                window.Show();
+                window.UpdateLayout();
+
+                SolidColorBrush background = Assert.IsType<SolidColorBrush>(titleBar.Background);
+                Assert.Equal(WpfColor.FromRgb(0xA8, 0x23, 0x1C), background.Color);
+            }
+            finally
+            {
+                window.Close();
+            }
+        });
+    }
+
     private static void RunOnSta(Action action)
     {
         Exception? exception = null;
diff --git a/src/SwitchifyPc.Tests/ThemeResourceTests.cs b/src/SwitchifyPc.Tests/ThemeResourceTests.cs
new file mode 100644
index 0000000..82ed588
--- /dev/null
+++ b/src/SwitchifyPc.Tests/ThemeResourceTests.cs
@@ -0,0 +1,125 @@
+using System.Windows;
+using System.Windows.Media;
+using SwitchifyPc.App;
+using WpfColor = System.Windows.Media.Color;
+using WpfColorConverter = System.Windows.Media.ColorConverter;
+
+namespace SwitchifyPc.Tests;
+
+[Collection(WpfTestCollection.Name)]
+public sealed class ThemeResourceTests
+{
+    private static readonly string[] RequiredKeys =
+    [
+        "BrandPrimary",
+        "BrandPrimaryHover",
+        "ChromeBackground",
+        "ChromeBackgroundHover",
+        "ChromeBackgroundPressed",
+        "ChromeCloseHover",
+        "ChromeClosePressed",
+        "ChromeForeground",
+        "ChromeSubtleForeground",
+        "AppBackground",
+        "Surface",
+        "SurfaceMuted",
+        "Text",
+        "TextMuted",
+        "BorderColor",
+        "StatusOk",
+        "StatusWarn",
+        "StatusError",
+        "AccentContainer",
+        "OnAccentContainer",
+        "SegmentSelectedBackground",
+        "ShadowColor"
+    ];
+
+    [Fact]
+    public void LightAndDarkThemesDefineSameResourceKeys()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary light = LoadTheme("Theme.Light.xaml");
+            ResourceDictionary dark = LoadTheme("Theme.Dark.xaml");
+
+            Assert.Equal(light.Keys.Cast<object>().Select(key => key.ToString()).Order().ToArray(),
+                dark.Keys.Cast<object>().Select(key => key.ToString()).Order().ToArray());
+            foreach (string key in RequiredKeys)
+            {
+                Assert.True(light.Contains(key), key);
+                Assert.True(dark.Contains(key), key);
+            }
+        });
+    }
+
+    [Fact]
+    public void ThemeDictionariesLoadBrushResources()
+    {
+        RunOnSta(() =>
+        {
+            foreach (ResourceDictionary theme in new[] { LoadTheme("Theme.Light.xaml"), LoadTheme("Theme.Dark.xaml") })
+            {
+                foreach (string key in RequiredKeys)
+                {
+                    Assert.IsType<SolidColorBrush>(theme[key]);
+                }
+            }
+        });
+    }
+
+    [Fact]
+    public void DarkThemeUsesQuietCharcoalPalette()
+    {
+        RunOnSta(() =>
+        {
+            ResourceDictionary dark = LoadTheme("Theme.Dark.xaml");
+
+            Assert.Equal(ColorFrom("#A8231C"), BrushColor(dark, "ChromeBackground"));
+            Assert.Equal(ColorFrom("#141318"), BrushColor(dark, "AppBackground"));
+            Assert.Equal(ColorFrom("#1F1F23"), BrushColor(dark, "Surface"));
+            Assert.Equal(ColorFrom("#F4EFF4"), BrushColor(dark, "Text"));
+        });
+    }
+
+    private static ResourceDictionary LoadTheme(string fileName)
+    {
+        string assemblyName = Uri.EscapeDataString(typeof(SwitchifyPc.App.App).Assembly.GetName().Name ?? "Switchify PC");
+        return new ResourceDictionary
+        {
+            Source = new Uri($"pack://application:,,,/{assemblyName};component/Themes/{fileName}", UriKind.Absolute)
+        };
+    }
+
+    private static WpfColor BrushColor(ResourceDictionary dictionary, string key)
+    {
+        return Assert.IsType<SolidColorBrush>(dictionary[key]).Color;
+    }
+
+    private static WpfColor ColorFrom(string value)
+    {
+        return (WpfColor)WpfColorConverter.ConvertFromString(value);
+    }
+
+    private static void RunOnSta(Action action)
+    {
+        Exception? exception = null;
+        Thread thread = new(() =>
+        {
+            try
+            {
+                action();
+            }
+            catch (Exception error)
+            {
+                exception = error;
+            }
+        });
+
+        thread.SetApartmentState(ApartmentState.STA);
+        thread.Start();
+        thread.Join();
+
+        if (exception is not null) throw exception;
+    }
+}
diff --git a/src/SwitchifyPc.Tests/ThemeXamlGuardTests.cs b/src/SwitchifyPc.Tests/ThemeXamlGuardTests.cs
new file mode 100644
index 0000000..b9c469c
--- /dev/null
+++ b/src/SwitchifyPc.Tests/ThemeXamlGuardTests.cs
@@ -0,0 +1,56 @@
+namespace SwitchifyPc.Tests;
+
+public sealed class ThemeXamlGuardTests
+{
+    private static readonly string[] ForbiddenLightThemeLiterals =
+    [
+        "#F5F4F7",
+        "#FFFFFF",
+        "#F3F2F6",
+        "#1C1B1F",
+        "#49454F",
+        "#E2E0E8"
+    ];
+
+    [Theory]
+    [InlineData("src/SwitchifyPc.App/MainWindow.xaml")]
+    [InlineData("src/SwitchifyPc.App/SettingsWindow.xaml")]
+    [InlineData("src/SwitchifyPc.App/Chrome/SwitchifyTitleBar.xaml")]
+    public void ThemedXamlDoesNotReintroduceHardCodedLightThemeColors(string path)
+    {
+        string[] lines = File.ReadAllLines(Path.Combine(RepoRoot(), path));
+
+        for (int index = 0; index < lines.Length; index++)
+        {
+            string line = lines[index];
+            if (IsAllowedLiteral(line)) continue;
+
+            foreach (string forbidden in ForbiddenLightThemeLiterals)
+            {
+                Assert.DoesNotContain(forbidden, line, StringComparison.OrdinalIgnoreCase);
+            }
+        }
+    }
+
+    private static bool IsAllowedLiteral(string line)
+    {
+        return line.Contains("Background=\"#FFFFFF\"", StringComparison.Ordinal) &&
+            line.Contains("IsCursorOverlayColorWhite", StringComparison.Ordinal) is false;
+    }
+
+    private static string RepoRoot()
+    {
+        DirectoryInfo? directory = new(AppContext.BaseDirectory);
+        while (directory is not null)
+        {
+            if (Directory.Exists(Path.Combine(directory.FullName, "src", "SwitchifyPc.App")))
+            {
+                return directory.FullName;
+            }
+
+            directory = directory.Parent;
+        }
+
+        throw new DirectoryNotFoundException("Could not locate repository root.");
+    }
+}
diff --git a/src/SwitchifyPc.Tests/WindowsAppThemeProviderTests.cs b/src/SwitchifyPc.Tests/WindowsAppThemeProviderTests.cs
new file mode 100644
index 0000000..f9fe058
--- /dev/null
+++ b/src/SwitchifyPc.Tests/WindowsAppThemeProviderTests.cs
@@ -0,0 +1,38 @@
+using SwitchifyPc.App.Themes;
+
+namespace SwitchifyPc.Tests;
+
+public sealed class WindowsAppThemeProviderTests
+{
+    [Fact]
+    public void ReadsDarkWhenAppsUseLightThemeIsZero()
+    {
+        WindowsAppThemeProvider provider = new(() => 0);
+
+        Assert.Equal(AppTheme.Dark, provider.GetCurrentTheme());
+    }
+
+    [Fact]
+    public void ReadsLightWhenAppsUseLightThemeIsOne()
+    {
+        WindowsAppThemeProvider provider = new(() => 1);
+
+        Assert.Equal(AppTheme.Light, provider.GetCurrentTheme());
+    }
+
+    [Fact]
+    public void FallsBackToLightWhenValueMissing()
+    {
+        WindowsAppThemeProvider provider = new(() => null);
+
+        Assert.Equal(AppTheme.Light, provider.GetCurrentTheme());
+    }
+
+    [Fact]
+    public void FallsBackToLightWhenRegistryReadFails()
+    {
+        WindowsAppThemeProvider provider = new(() => throw new InvalidOperationException("registry unavailable"));
+
+        Assert.Equal(AppTheme.Light, provider.GetCurrentTheme());
+    }
+}
diff --git a/src/SwitchifyPc.Tests/WpfTestCollection.cs b/src/SwitchifyPc.Tests/WpfTestCollection.cs
index ab5e977..1471d07 100644
--- a/src/SwitchifyPc.Tests/WpfTestCollection.cs
+++ b/src/SwitchifyPc.Tests/WpfTestCollection.cs
@@ -1,4 +1,7 @@
 using Xunit;
+using SwitchifyPc.App.Themes;
+using WpfResourceDictionary = System.Windows.ResourceDictionary;
+using WpfApplication = System.Windows.Application;
 
 namespace SwitchifyPc.Tests;
 
@@ -7,3 +10,35 @@ public sealed class WpfTestCollection
 {
     public const string Name = "WPF tests";
 }
+
+public static class WpfTestApplication
+{
+    public static void ApplyTheme(AppTheme theme)
+    {
+        WpfApplication application = WpfApplication.Current ?? new WpfApplication
+        {
+            ShutdownMode = System.Windows.ShutdownMode.OnExplicitShutdown
+        };
+
+        new AppThemeManager(
+            application.Resources,
+            application.Dispatcher,
+            new FixedThemeProvider(theme),
+            ThemeDictionary).ApplyCurrentTheme();
+    }
+
+    private static WpfResourceDictionary ThemeDictionary(AppTheme theme)
+    {
+        string assemblyName = Uri.EscapeDataString(typeof(SwitchifyPc.App.App).Assembly.GetName().Name ?? "Switchify PC");
+        string fileName = theme == AppTheme.Dark ? "Theme.Dark.xaml" : "Theme.Light.xaml";
+        return new WpfResourceDictionary
+        {
+            Source = new Uri($"pack://application:,,,/{assemblyName};component/Themes/{fileName}", UriKind.Absolute)
+        };
+    }
+
+    private sealed class FixedThemeProvider(AppTheme theme) : IAppThemeProvider
+    {
+        public AppTheme GetCurrentTheme() => theme;
+    }
+}