diff --git a/index.php b/index.php
index 6b93b7b..d8208eb 100644
--- a/index.php
+++ b/index.php
@@ -42,6 +42,7 @@ header('Expires: 0');
     <header id="topbar">
         <button id="back-btn" class="icon-btn" style="display:none">←</button>
         <h1 id="page-title">Baustelle</h1>
+        <button id="install-btn" class="icon-btn" title="Als App installieren" style="display:none">📲</button>
         <button id="help-btn" class="icon-btn" title="Hilfe">❓</button>
         <span id="status-badge">🟢</span>
     </header>
@@ -63,6 +64,36 @@ header('Expires: 0');
 <script src="lib/router.js?v=<?php echo $jsVersion; ?>"></script>
 <script src="app.js?v=<?php echo $jsVersion; ?>"></script>
 <script>
+/* PWA Install Prompt abfangen */
+let deferredInstallPrompt = null;
+window.addEventListener('beforeinstallprompt', function (e) {
+    e.preventDefault();
+    deferredInstallPrompt = e;
+    var btn = document.getElementById('install-btn');
+    if (btn) btn.style.display = '';
+    console.log('PWA: Install-Prompt ist verfügbar');
+});
+document.addEventListener('DOMContentLoaded', function () {
+    var btn = document.getElementById('install-btn');
+    if (btn) btn.addEventListener('click', async function () {
+        if (!deferredInstallPrompt) {
+            alert('Installation nicht verfügbar. Falls du die App bereits installiert hast, öffne sie über das Home-Screen-Icon.\n\nAuf iPhone: Safari → Teilen → "Zum Home-Bildschirm".');
+            return;
+        }
+        deferredInstallPrompt.prompt();
+        var choice = await deferredInstallPrompt.userChoice;
+        if (choice.outcome === 'accepted') {
+            btn.style.display = 'none';
+        }
+        deferredInstallPrompt = null;
+    });
+});
+window.addEventListener('appinstalled', function () {
+    var btn = document.getElementById('install-btn');
+    if (btn) btn.style.display = 'none';
+    console.log('PWA: Installation abgeschlossen');
+});
+
 if ('serviceWorker' in navigator) {
     window.addEventListener('load', function () {
         navigator.serviceWorker.register('sw.js?v=<?php echo $swVersion; ?>').then(function (reg) {