diff --git a/MainWindow.xaml b/MainWindow.xaml
index bd049f3..c8edca6 100644
--- a/MainWindow.xaml
+++ b/MainWindow.xaml
@@ -13,6 +13,7 @@
         MinWidth="1366" MinHeight="768"
         Icon="/ytLive;component/Assets/llamacasty-icon.png"
         Background="#1a1a2e"
+        FontFamily="{StaticResource FontFamily.Sans}"
         WindowStartupLocation="Manual"
         Closing="MainWindow_Closing"
         Loaded="MainWindow_Loaded"
diff --git a/ytLive.Tests/BundledFontsTests.cs b/ytLive.Tests/BundledFontsTests.cs
index c1f3ee0..89d2eb8 100644
--- a/ytLive.Tests/BundledFontsTests.cs
+++ b/ytLive.Tests/BundledFontsTests.cs
@@ -1,5 +1,10 @@
+using System;
 using System.IO;
+using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
+using System.Windows;
+using System.Windows.Media;
 using Xunit;
 
 namespace ytLive.Tests;
@@ -30,8 +35,10 @@ public class BundledFontsTests
             Assert.True(new FileInfo(path).Length > 50_000, $"{name} looks like a placeholder");
         }
 
-        // 2. The project packages them as WPF resources.
-        Assert.Contains(@"Assets\Fonts\*.ttf", SourceAssert.Text("ytLive.csproj"));
+        // 2. The project packages each one as a WPF resource (an explicit item, not a guess).
+        var csproj = SourceAssert.Text("ytLive.csproj");
+        foreach (var name in Files)
+            Assert.Contains($@"Assets\Fonts\{name}", csproj);
 
         // 3. The theme resolves each family from the pack folder — a bare family name would
         //    only work if the user happened to have the font installed.
diff --git a/ytLive.csproj b/ytLive.csproj
index dc00ee9..b65e7ae 100644
--- a/ytLive.csproj
+++ b/ytLive.csproj
@@ -81,7 +81,12 @@
     <Resource Include="Assets\chat-background.jpg" />
     <Resource Include="Assets\alert-default.mp4" />
     <!-- Design-standard typefaces (DESIGN.md): Inter + JetBrains Mono, OFL-1.1. -->
-    <Resource Include="Assets\Fonts\*.ttf" />
+    <Resource Include="Assets\Fonts\Inter-Regular.ttf" />
+    <Resource Include="Assets\Fonts\Inter-Medium.ttf" />
+    <Resource Include="Assets\Fonts\Inter-SemiBold.ttf" />
+    <Resource Include="Assets\Fonts\Inter-Bold.ttf" />
+    <Resource Include="Assets\Fonts\JetBrainsMono-Medium.ttf" />
+    <Resource Include="Assets\Fonts\JetBrainsMono-SemiBold.ttf" />
   </ItemGroup>
 
   <ItemGroup>