diff --git a/diagnostic/index.html b/diagnostic/index.html
index a99d605..a14732c 100644
--- a/diagnostic/index.html
+++ b/diagnostic/index.html
@@ -2881,16 +2881,29 @@
     // ── Gehirn-Tab ────────────────────────────────────────────
 
     async function loadBrainStatus() {
-      const el = document.getElementById('brain-status');
-      if (!el) return;
+      // Es gibt ZWEI Brain-Status-Anzeigen: kompakte Card im Main-Tab
+      // (brain-dot + brain-status-short + brain-error) und die ausfuehrliche
+      // im Gehirn-Tab (brain-status). Beide muessen synchron updated werden.
+      const mainShort = document.getElementById('brain-status-short');
+      const mainDot = document.getElementById('brain-dot');
+      const mainErr = document.getElementById('brain-error');
+      const detail = document.getElementById('brain-status');
       try {
         const r = await fetch('/api/brain/health');
         if (!r.ok) throw new Error('HTTP ' + r.status);
         const d = await r.json();
-        const st = d.status === 'ok' ? '🟢 online' : '🟡 ' + (d.status || 'unknown');
-        el.innerHTML = `${st} · ${d.memory_count ?? '?'} Memories · Qdrant: ${d.qdrant || '-'}`;
+        const ok = d.status === 'ok';
+        const st = ok ? '🟢 online' : '🟡 ' + (d.status || 'unknown');
+        const detailText = `${st} · ${d.memory_count ?? '?'} Memories · Qdrant: ${d.qdrant || '-'}`;
+        if (detail) detail.innerHTML = detailText;
+        if (mainShort) mainShort.textContent = ok ? 'online' : (d.status || 'unbekannt');
+        if (mainDot) mainDot.className = `dot ${ok ? 'connected' : 'disconnected'}`;
+        if (mainErr) mainErr.textContent = ok ? '' : (d.error || '');
       } catch (e) {
-        el.innerHTML = `🔴 Brain nicht erreichbar (${e.message})`;
+        if (detail) detail.innerHTML = `🔴 Brain nicht erreichbar (${e.message})`;
+        if (mainShort) mainShort.textContent = 'nicht erreichbar';
+        if (mainDot) mainDot.className = 'dot disconnected';
+        if (mainErr) mainErr.textContent = e.message;
       }
       // Conversation-Stats (separater Endpoint)
       const conv = document.getElementById('conversation-status');