diff --git a/windows/App.xaml b/windows/App.xaml
new file mode 100644
index 0000000..3245b10
--- /dev/null
+++ b/windows/App.xaml
@@ -0,0 +1,102 @@
+<Application x:Class="ClaudeCheckerWindows.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             ShutdownMode="OnExplicitShutdown">
+    <Application.Resources>
+        <SolidColorBrush x:Key="BackgroundBrush"    Color="#1C1C1E"/>
+        <SolidColorBrush x:Key="CardBrush"          Color="#2C2C2E"/>
+        <SolidColorBrush x:Key="AccentBrush"        Color="#F97316"/>
+        <SolidColorBrush x:Key="SecondaryBrush"     Color="#888888"/>
+        <SolidColorBrush x:Key="BorderBrush"        Color="#38383A"/>
+        <SolidColorBrush x:Key="BlueBrush"          Color="#3B82F6"/>
+
+        <Style x:Key="HeaderText" TargetType="TextBlock">
+            <Setter Property="FontSize"   Value="10"/>
+            <Setter Property="FontWeight" Value="SemiBold"/>
+            <Setter Property="Foreground" Value="{StaticResource SecondaryBrush}"/>
+        </Style>
+
+        <Style x:Key="IconButton" TargetType="Button">
+            <Setter Property="Background"  Value="Transparent"/>
+            <Setter Property="BorderBrush" Value="#33FFFFFF"/>
+            <Setter Property="BorderThickness" Value="0.5"/>
+            <Setter Property="Foreground"  Value="{StaticResource SecondaryBrush}"/>
+            <Setter Property="Width"       Value="26"/>
+            <Setter Property="Height"      Value="26"/>
+            <Setter Property="Cursor"      Value="Hand"/>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="Button">
+                        <Border Background="{TemplateBinding Background}"
+                                BorderBrush="{TemplateBinding BorderBrush}"
+                                BorderThickness="{TemplateBinding BorderThickness}"
+                                CornerRadius="5">
+                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                        </Border>
+                        <ControlTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="True">
+                                <Setter Property="Background" Value="#1AFFFFFF"/>
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+
+        <Style x:Key="PrimaryButton" TargetType="Button">
+            <Setter Property="Background"  Value="{StaticResource BlueBrush}"/>
+            <Setter Property="Foreground"  Value="White"/>
+            <Setter Property="BorderThickness" Value="0"/>
+            <Setter Property="Padding"     Value="14,6"/>
+            <Setter Property="FontSize"    Value="12"/>
+            <Setter Property="FontWeight"  Value="SemiBold"/>
+            <Setter Property="Cursor"      Value="Hand"/>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="Button">
+                        <Border Background="{TemplateBinding Background}" CornerRadius="6"
+                                Padding="{TemplateBinding Padding}">
+                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                        </Border>
+                        <ControlTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="True">
+                                <Setter Property="Background" Value="#2563EB"/>
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+
+        <Style x:Key="SmallButton" TargetType="Button">
+            <Setter Property="Background"    Value="Transparent"/>
+            <Setter Property="BorderBrush"   Value="#33FFFFFF"/>
+            <Setter Property="BorderThickness" Value="0.5"/>
+            <Setter Property="Foreground"    Value="{StaticResource SecondaryBrush}"/>
+            <Setter Property="Padding"       Value="8,4"/>
+            <Setter Property="FontSize"      Value="11"/>
+            <Setter Property="Cursor"        Value="Hand"/>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="Button">
+                        <Border Background="{TemplateBinding Background}"
+                                BorderBrush="{TemplateBinding BorderBrush}"
+                                BorderThickness="{TemplateBinding BorderThickness}"
+                                CornerRadius="5" Padding="{TemplateBinding Padding}">
+                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                        </Border>
+                        <ControlTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="True">
+                                <Setter Property="Background" Value="#1AFFFFFF"/>
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+
+        <Style TargetType="ScrollViewer">
+            <Setter Property="VerticalScrollBarVisibility" Value="Hidden"/>
+        </Style>
+    </Application.Resources>
+</Application>