diff --git a/vite.config.ts b/vite.config.ts
index 6124172..b66256e 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -22,6 +22,10 @@ export default defineConfig({
       },
       workbox: {
         navigateFallback: '/index.html',
+        // Only apply the navigation fallback to the portal's own routes.
+        // App sub-paths (/notices/, /kitchen/, etc.) must reach nginx so
+        // the portal nginx can proxy them to the correct app container.
+        navigateFallbackAllowlist: [/^\/($|login|app\/|admin\/)/],
         globPatterns: ['**/*.{js,css,html,ico,png,svg}'],
       },
     }),