diff --git a/apple/VniDrop/Resources/Assets.xcassets/AccentColor.colorset/Contents.json b/apple/VniDrop/Resources/Assets.xcassets/AccentColor.colorset/Contents.json
new file mode 100644
index 0000000..e4c3f7f
--- /dev/null
+++ b/apple/VniDrop/Resources/Assets.xcassets/AccentColor.colorset/Contents.json
@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0.9685",
+          "green" : "0.3315",
+          "red" : "0.6606"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/apple/VniDrop/UI/Theme/VniDropColors.swift b/apple/VniDrop/UI/Theme/VniDropColors.swift
index 3d7c8dd..f811b02 100644
--- a/apple/VniDrop/UI/Theme/VniDropColors.swift
+++ b/apple/VniDrop/UI/Theme/VniDropColors.swift
@@ -52,7 +52,9 @@ struct VniDropColors {
 }
 
 extension VniDropColors {
-	/// The single brand accent used app-wide as the SwiftUI tint.
+	/// The single brand accent used app-wide as the SwiftUI tint. Mirrored by the
+	/// `AccentColor` asset (the OS-level global accent for the macOS sidebar etc.);
+	/// keep the two in sync.
 	static let brandPurple = Color.hsl(271, 91, 65)
 
 	static let light = VniDropColors(
diff --git a/apple/project.yml b/apple/project.yml
index b819d39..843a363 100644
--- a/apple/project.yml
+++ b/apple/project.yml
@@ -55,6 +55,9 @@ targets:
         SWIFT_STRICT_CONCURRENCY: complete
         ENABLE_USER_SCRIPT_SANDBOXING: NO
         ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        # App-wide accent (macOS sidebar selection, default control tints). The
+        # AccentColor asset mirrors VniDropColors.brandPurple — keep them in sync.
+        ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME: AccentColor
       configs:
         debug:
           CODE_SIGN_ENTITLEMENTS: VniDrop/Resources/VniDrop.entitlements