diff --git a/src/ClaudeDo.Ui/Views/MainWindow.axaml b/src/ClaudeDo.Ui/Views/MainWindow.axaml
index cde2e6a..e110114 100644
--- a/src/ClaudeDo.Ui/Views/MainWindow.axaml
+++ b/src/ClaudeDo.Ui/Views/MainWindow.axaml
@@ -75,6 +75,16 @@
       </Grid>
     </Border>
 
+    <!-- Background gradient layer -->
+    <Border Grid.Row="1">
+      <Border.Background>
+        <RadialGradientBrush Center="50%,50%" GradientOrigin="50%,50%" RadiusX="70%" RadiusY="70%">
+          <GradientStop Offset="0"   Color="{StaticResource DeepColor}" />
+          <GradientStop Offset="1"   Color="{StaticResource VoidColor}" />
+        </RadialGradientBrush>
+      </Border.Background>
+    </Border>
+
     <!-- Three islands -->
     <Grid Grid.Row="1" Margin="7" ColumnDefinitions="260,*,320">
       <Border Grid.Column="0" Classes="island" Margin="7">