diff --git a/app/static/sw.js b/app/static/sw.js
index 4b4e58d..fe576ab 100644
--- a/app/static/sw.js
+++ b/app/static/sw.js
@@ -1,9 +1,28 @@
 // NextSnap Service Worker
 // Provides offline-first caching for the app shell
 
-const CACHE_VERSION = 'nextsnap-v19';
-const APP_SHELL_CACHE = 'nextsnap-shell-v15';
-const RUNTIME_CACHE = 'nextsnap-runtime-v15';
+const CACHE_VERSION = 'nextsnap-v20';
+const APP_SHELL_CACHE = 'nextsnap-shell-v16';
+const RUNTIME_CACHE = 'nextsnap-runtime-v16';
+
+// Offline fallback page (served when network fails and no cached version exists)
+const OFFLINE_PAGE = `<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Offline - NextSnap</title>
+<style>
+*{margin:0;padding:0;box-sizing:border-box}
+body{font-family:-apple-system,system-ui,sans-serif;background:#1a1a2e;color:#e0e0e0;
+display:flex;align-items:center;justify-content:center;min-height:100vh;padding:2rem;text-align:center}
+h1{font-size:1.5rem;margin-bottom:1rem;color:#fff}
+p{color:#aaa;margin-bottom:1.5rem;line-height:1.5}
+button{background:#4dabf7;color:#fff;border:none;padding:0.75rem 2rem;border-radius:8px;
+font-size:1rem;cursor:pointer;min-height:44px}
+button:active{opacity:0.8}
+</style></head><body>
+<div><h1>You're Offline</h1><p>Check your internet connection and try again.</p>
+<button onclick="location.reload()">Retry</button></div>
+</body></html>`;
 
 // Assets to cache on install
 const APP_SHELL_ASSETS = [
@@ -128,7 +147,10 @@ self.addEventListener('fetch', (event) => {
                                 { status: 503, headers: { 'Content-Type': 'application/json' } }
                             );
                         }
-                        return new Response('Offline', { status: 503 });
+                        return new Response(OFFLINE_PAGE, {
+                            status: 200,
+                            headers: { 'Content-Type': 'text/html' }
+                        });
                     });
             })
     );
