diff --git a/app.js b/app.js
index 645e171..9842acc 100644
--- a/app.js
+++ b/app.js
@@ -2716,4 +2716,9 @@ init().then(() => {
   createPortalTunnel();
   fetchGiteaData();
   setInterval(fetchGiteaData, 30000);
+
+  // Register service worker for PWA
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.register('/service-worker.js');
+  }
 });
diff --git a/manifest.json b/manifest.json
index 304b8fd..f23083d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -8,9 +8,14 @@
   "theme_color": "#4af0c0",
   "icons": [
     {
-      "src": "/favicon.ico",
-      "sizes": "64x64",
-      "type": "image/x-icon"
+      "src": "/icons/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/service-worker.js b/service-worker.js
new file mode 100644
index 0000000..1cdc715
--- /dev/null
+++ b/service-worker.js
@@ -0,0 +1,26 @@
+const CACHE_NAME = 'nexus-v1.1';
+const ASSETS_TO_CACHE = [
+  '/',
+  '/index.html',
+  '/app.js',
+  '/style.css',
+  '/manifest.json',
+  '/icons/icon-192x192.png',
+  '/icons/icon-512x512.png'
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CachedName).then(cache => {
+      return cache.addAll(ASSETS_TO_CACHE);
+    })
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.match(event.request).then(response => {
+      return response || fetch(event.request);
+    })
+  );
+});