diff --git a/public/js/state.js b/public/js/state.js
index 4b67f7c..21bb68b 100644
--- a/public/js/state.js
+++ b/public/js/state.js
@@ -64,8 +64,12 @@ function onMarksConfigChanged() {
 rebuildStateChipsFromConfig();
 
 // ── Seen ──────────────────────────────────────────────────────────
-function loadSeen()       { try { return JSON.parse(localStorage.getItem(SEEN_KEY)||'{}'); } catch { return {}; } }
-function saveSeen(s)      { try { localStorage.setItem(SEEN_KEY, JSON.stringify(s)); } catch {} }
+function seenStorageKey() {
+  const username = String(currentUser?.username || '').trim().toLowerCase();
+  return username ? `${SEEN_KEY}:${username}` : SEEN_KEY;
+}
+function loadSeen()       { try { return JSON.parse(localStorage.getItem(seenStorageKey())||'{}'); } catch { return {}; } }
+function saveSeen(s)      { try { localStorage.setItem(seenStorageKey(), JSON.stringify(s||{})); } catch {} }
 function markSeen(id,upd) { const s=loadSeen(); s[id]=upd; saveSeen(s); }
 function markAllRead(){
   const s=loadSeen();