diff --git a/backend/main.py b/backend/main.py
index 6f4b1c3..bd4b2c4 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -1,3 +1,4 @@
+import json
 import logging
 from contextlib import asynccontextmanager
 
@@ -27,6 +28,11 @@ class ThemaNeu(BaseModel):
     hinweise: str = ""
 
 
+class Position(BaseModel):
+    abschnitt: str | None = None
+    lesemodus: int | None = None
+
+
 def _pruefen(name: str) -> dict:
     if not state.name_ok(name) or not (t := state.thema(name)):
         raise HTTPException(404, "Thema unbekannt")
@@ -94,6 +100,18 @@ async def zustand(name: str):
             "deutung": st.get("deutung") or state.deutung(name), "ereignisse": st["ereignisse"][-100:]}
 
 
+@app.get("/api/topics/{name}/position")
+async def position_lesen(name: str):
+    _pruefen(name)
+    return state.position(name)
+
+
+@app.put("/api/topics/{name}/position")
+async def position_schreiben(name: str, body: Position):
+    _pruefen(name)
+    return state.position_setzen(name, {k: v for k, v in body.model_dump().items() if v is not None})
+
+
 @app.get("/api/topics/{name}/guide")
 async def guide(name: str):
     _pruefen(name)
diff --git a/backend/state.py b/backend/state.py
index e79897a..2ce7b4d 100644
--- a/backend/state.py
+++ b/backend/state.py
@@ -167,3 +167,15 @@ def slug(text: str) -> str:
         t = t.replace(a, b)
     t = re.sub(r"[^a-z0-9]+", "-", t).strip("-")
     return t[:60] or "kapitel"
+
+
+def position(name: str) -> dict:
+    """Leseposition (Abschnitt der Buchansicht, Bildschirm des Lesemodus) – geräteübergreifend auf dem Server."""
+    return _lesen(verzeichnis(name) / "position.json", {})
+
+
+def position_setzen(name: str, werte: dict) -> dict:
+    p = position(name)
+    p.update(werte)
+    _schreiben(verzeichnis(name) / "position.json", p)
+    return p
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 9a84675..744864d 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1,10 +1,10 @@
 {
-  "name": "primer-frontend",
+  "name": "buchwerk-frontend",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "primer-frontend",
+      "name": "buchwerk-frontend",
       "dependencies": {
         "dompurify": "^3.2.0",
         "highlight.js": "^11.11.0",
diff --git a/frontend/src/api.js b/frontend/src/api.js
index d124df6..d39ce5e 100644
--- a/frontend/src/api.js
+++ b/frontend/src/api.js
@@ -23,6 +23,8 @@ export const api = {
   reset: (t) => req(`/topics/${e(t)}/reset`, { method: 'POST' }),
   state: (t) => req(`/topics/${e(t)}/state`),
   guide: (t) => req(`/topics/${e(t)}/guide`),
+  position: (t) => req(`/topics/${e(t)}/position`),
+  positionSetzen: (t, daten) => req(`/topics/${e(t)}/position`, { method: 'PUT', body: daten }),
   guideMdUrl: (t) => `/api/topics/${e(t)}/guide.md`,
   pdfUrl: (t) => `/api/topics/${e(t)}/buch.pdf`,
 }
diff --git a/frontend/src/components/Guide.vue b/frontend/src/components/Guide.vue
index ea816bb..329905c 100644
--- a/frontend/src/components/Guide.vue
+++ b/frontend/src/components/Guide.vue
@@ -26,6 +26,12 @@ const aktiv = ref('')
 const lese = ref(null)
 let beobachter = null
 let ladeSeq = 0
+// Leseposition auf dem Server merken (geräteübergreifend), gebündelt alle 1,5 s
+let merkTimer = null
+function merken(id) {
+  clearTimeout(merkTimer)
+  merkTimer = setTimeout(() => api.positionSetzen(props.topic, { abschnitt: id }).catch(() => {}), 1500)
+}
 const cache = new Map()   // Schlüssel: Abschnitt + Textlänge → unveränderte Abschnitte werden nicht neu gerendert
 
 onUnmounted(() => { beobachter?.disconnect() })
@@ -33,13 +39,13 @@ onUnmounted(() => { beobachter?.disconnect() })
 async function laden() {
   if (!props.topic) { daten.value = null; return }
   const seq = ++ladeSeq
-  const d = await api.guide(props.topic)
+  const [d, pos] = await Promise.all([api.guide(props.topic), api.position(props.topic).catch(() => ({}))])
   if (seq !== ladeSeq) return
   daten.value = d
   await nextTick()
   spy()
   // Deep-Link (#a03-1 / #k03) hat Vorrang vor der gemerkten Position; beides nur beim ersten Laden
-  const ziel = location.hash.slice(1) || localStorage.getItem('pos:' + props.topic)
+  const ziel = location.hash.slice(1) || pos.abschnitt
   if (ziel && !aktiv.value) document.getElementById(ziel)?.scrollIntoView({ block: 'start' })
 }
 watch(() => props.topic, () => { aktiv.value = ''; cache.clear(); laden() }, { immediate: true })
@@ -73,7 +79,7 @@ const kapBadge = { geschrieben: ['gelb', 'geschrieben'], geprueft: ['blau', 'gep
 function spy() {
   beobachter?.disconnect()
   beobachter = new IntersectionObserver((es) => {
-    for (const e of es) if (e.isIntersecting) { aktiv.value = e.target.id; localStorage.setItem('pos:' + props.topic, e.target.id) }
+    for (const e of es) if (e.isIntersecting) { aktiv.value = e.target.id; merken(e.target.id) }
   }, { root: lese.value, rootMargin: '0px 0px -75% 0px' })
   document.querySelectorAll('.buch [data-spy]').forEach((el) => beobachter.observe(el))
 }
diff --git a/frontend/src/components/Lesemodus.vue b/frontend/src/components/Lesemodus.vue
index e1f5331..40b8819 100644
--- a/frontend/src/components/Lesemodus.vue
+++ b/frontend/src/components/Lesemodus.vue
@@ -1,6 +1,7 @@
 <script setup>
 import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
 import { render, zeit } from '../markdown.js'
+import { api } from '../api.js'
 
 const props = defineProps({ daten: Object, topic: String })
 const emit = defineEmits(['schliessen'])
@@ -31,7 +32,12 @@ function html(a) {
 
 function vor() { if (pos.value < screens.value.length - 1) pos.value++ }
 function zurueck() { if (pos.value > 0) pos.value-- }
-watch(pos, (p) => { localStorage.setItem('lm:' + props.topic, String(p)); buehne.value?.scrollTo({ top: 0 }) })
+let merkTimer = null
+watch(pos, (p) => {
+  buehne.value?.scrollTo({ top: 0 })
+  clearTimeout(merkTimer)
+  merkTimer = setTimeout(() => api.positionSetzen(props.topic, { lesemodus: p }).catch(() => {}), 1500)
+})
 
 function taste(e) {
   if (e.key === 'ArrowRight' || e.key === ' ' || e.key === 'PageDown') { e.preventDefault(); vor() }
@@ -57,9 +63,9 @@ function wischEnde(e) {
   if (Math.abs(dx) < 60 || Math.abs(dx) < 2 * Math.abs(dy)) return
   dx < 0 ? vor() : zurueck()
 }
-onMounted(() => {
+onMounted(async () => {
   window.addEventListener('keydown', taste)
-  const merk = Number(localStorage.getItem('lm:' + props.topic) || 0)
+  const merk = Number((await api.position(props.topic).catch(() => ({}))).lesemodus || 0)
   pos.value = Math.min(merk, screens.value.length - 1)
 })
 onUnmounted(() => window.removeEventListener('keydown', taste))