diff --git a/backend/main.py b/backend/main.py
index 64eb22b..0060e20 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -190,4 +190,8 @@ if config.FRONTEND_DIST.exists():
     async def spa(pfad: str):
         if pfad.startswith("api/"):
             raise HTTPException(404, "Unbekannter API-Pfad")
+        # Statische Dateien des Frontends (Manifest, Icons) direkt ausliefern, alles andere ist die App
+        datei = (config.FRONTEND_DIST / pfad).resolve()
+        if pfad and datei.is_file() and config.FRONTEND_DIST.resolve() in datei.parents:
+            return FileResponse(datei)
         return FileResponse(config.FRONTEND_DIST / "index.html")
diff --git a/frontend/index.html b/frontend/index.html
index 5d20fea..16c5ed3 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -4,6 +4,10 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>buchwerk</title>
+    <link rel="manifest" href="/manifest.webmanifest" />
+    <meta name="theme-color" content="#000000" />
+    <meta name="mobile-web-app-capable" content="yes" />
+    <link rel="apple-touch-icon" href="/icons/icon-192.png" />
     <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'><rect width='32' height='32' rx='7' fill='%237a5b2c'/><path d='M8 8h7a3 3 0 0 1 3 3v13a2 2 0 0 0-2-2H8zM24 8h-7a3 3 0 0 0-3 3v13a2 2 0 0 1 2-2h8z' fill='%23f8f1de'/></svg>" />
   </head>
   <body>
diff --git a/frontend/public/icons/icon-192.png b/frontend/public/icons/icon-192.png
new file mode 100644
index 0000000..701acdb
Binary files /dev/null and b/frontend/public/icons/icon-192.png differ
diff --git a/frontend/public/icons/icon-512.png b/frontend/public/icons/icon-512.png
new file mode 100644
index 0000000..0f6e46e
Binary files /dev/null and b/frontend/public/icons/icon-512.png differ
diff --git a/frontend/public/manifest.webmanifest b/frontend/public/manifest.webmanifest
new file mode 100644
index 0000000..592c62f
--- /dev/null
+++ b/frontend/public/manifest.webmanifest
@@ -0,0 +1,16 @@
+{
+  "name": "buchwerk",
+  "short_name": "buchwerk",
+  "description": "Sachbücher lesen",
+  "lang": "de",
+  "start_url": "/",
+  "scope": "/",
+  "display": "fullscreen",
+  "orientation": "portrait",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any maskable" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any maskable" }
+  ]
+}
diff --git a/frontend/src/components/Lesemodus.vue b/frontend/src/components/Lesemodus.vue
index 69252d4..54f1bb7 100644
--- a/frontend/src/components/Lesemodus.vue
+++ b/frontend/src/components/Lesemodus.vue
@@ -46,13 +46,19 @@ function html(s) {
   return cache.get(key)
 }
 
-function vor() { if (pos.value < screens.value.length - 1) pos.value++ }
+// Nach dem Sperren des Handys ist das Vollbild weg; ein Tippen darf es wieder anfordern. Als installierte App unnötig.
+function vollbildHolen() {
+  if (document.fullscreenElement || !document.documentElement.requestFullscreen) return
+  if (matchMedia('(display-mode: fullscreen), (display-mode: standalone)').matches) return
+  document.documentElement.requestFullscreen().catch(() => {})
+}
+function vor() { vollbildHolen(); if (pos.value < screens.value.length - 1) pos.value++ }
 // Von vorn: auch die Buchansicht zurücksetzen, sonst zöge sie den Lesemodus wieder nach hinten
 async function vonVorn() {
   await api.positionSetzen(props.slug, props.version, { abschnitt: 'vorwort', lesemodus: 'vorwort', zuletzt: 'lesen' }).catch(() => {})
   pos.value = 0
 }
-function zurueck() { if (pos.value > 0) pos.value-- }
+function zurueck() { vollbildHolen(); if (pos.value > 0) pos.value-- }
 let merkTimer = null
 watch(pos, (p) => {
   buehne.value?.scrollTo({ top: 0 })