diff --git a/index.html b/index.html
index 1de8749..da80586 100644
--- a/index.html
+++ b/index.html
@@ -405,27 +405,47 @@
   }
   tick(); setInterval(tick, 1000);
 
-  // ── Notes ──────────────────────────────────────────────────────────────
-  const NOTES_KEY = 'dashboard_notes';
+  // ── Notes — server-backed so they sync across all devices ─────────────
+  const API = '/notes.php';
+  let _notes = [];
 
-  function loadNotes() {
-    return JSON.parse(localStorage.getItem(NOTES_KEY) || '[]');
+  function escHtml(s) {
+    return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/\n/g,'<br>');
   }
-  function saveNotes(notes) {
-    localStorage.setItem(NOTES_KEY, JSON.stringify(notes));
+
+  async function notesApi(action, body = {}) {
+    try {
+      const r = await fetch(API, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action, ...body }),
+        credentials: 'same-origin',
+      });
+      return await r.json();
+    } catch (e) { return { ok: false }; }
+  }
+
+  async function fetchNotes() {
+    const el = document.getElementById('notes-list');
+    if (el && !_notes.length) el.innerHTML = '<div style="color:#8b90a8;font-size:.85rem">Loading…</div>';
+    try {
+      const r = await fetch(API + '?action=list', { credentials: 'same-origin' });
+      const d = await r.json();
+      _notes = d.notes || [];
+    } catch (e) { _notes = []; }
+    renderNotes();
   }
 
   function renderNotes() {
-    const notes = loadNotes();
-    const list  = document.getElementById('notes-list');
+    const list = document.getElementById('notes-list');
     if (!list) return;
-    if (!notes.length) {
+    if (!_notes.length) {
       list.innerHTML = '<div style="color:#8b90a8;font-size:.85rem;padding:.5rem 0">No notes yet. Add one above.</div>';
       return;
     }
-    list.innerHTML = notes.map((n, i) => `
-      <div class="note-item ${n.done ? 'note-done' : ''}" data-i="${i}">
-        <button class="note-check" onclick="toggleNote(${i})" title="${n.done ? 'Mark incomplete' : 'Mark done'}">
+    list.innerHTML = _notes.map(n => `
+      <div class="note-item ${n.done ? 'note-done' : ''}">
+        <button class="note-check" onclick="toggleNote('${n.id}')" title="${n.done ? 'Mark incomplete' : 'Mark done'}">
           ${n.done ? '✅' : '<span class="note-circle"></span>'}
         </button>
         <div class="note-body">
@@ -433,49 +453,48 @@
           ${n.detail ? `<div class="note-detail">${escHtml(n.detail)}</div>` : ''}
           <div class="note-meta">${new Date(n.ts).toLocaleString('en-US',{month:'short',day:'numeric',hour:'2-digit',minute:'2-digit'})}</div>
         </div>
-        <button class="note-del" onclick="deleteNote(${i})" title="Delete">✕</button>
+        <button class="note-del" onclick="deleteNote('${n.id}')" title="Delete">✕</button>
       </div>`).join('');
   }
 
-  function escHtml(s) {
-    return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/\n/g,'<br>');
-  }
-
-  function addNote() {
+  async function addNote() {
     const txt = document.getElementById('note-input').value.trim();
     const det = document.getElementById('note-detail').value.trim();
     if (!txt) { document.getElementById('note-input').focus(); return; }
-    const notes = loadNotes();
-    notes.unshift({ text: txt, detail: det, done: false, ts: Date.now() });
-    saveNotes(notes);
-    document.getElementById('note-input').value  = '';
-    document.getElementById('note-detail').value = '';
-    document.getElementById('note-detail').style.display = 'none';
-    document.getElementById('note-detail-toggle').textContent = '+ Add details';
-    renderNotes();
+    const btn = document.querySelector('.btn-note-add');
+    btn.disabled = true;
+    const r = await notesApi('add', { text: txt, detail: det });
+    btn.disabled = false;
+    if (r.ok) {
+      _notes.unshift(r.note);
+      document.getElementById('note-input').value  = '';
+      document.getElementById('note-detail').value = '';
+      document.getElementById('note-detail').style.display = 'none';
+      document.getElementById('note-detail-toggle').textContent = '+ Add details';
+      renderNotes();
+    }
   }
 
-  function toggleNote(i) {
-    const notes = loadNotes();
-    notes[i].done = !notes[i].done;
-    saveNotes(notes);
+  async function toggleNote(id) {
+    _notes = _notes.map(n => n.id === id ? {...n, done: !n.done} : n);
     renderNotes();
+    await notesApi('toggle', { id });
   }
 
-  function deleteNote(i) {
-    const notes = loadNotes();
-    notes.splice(i, 1);
-    saveNotes(notes);
+  async function deleteNote(id) {
+    _notes = _notes.filter(n => n.id !== id);
     renderNotes();
+    await notesApi('delete', { id });
   }
 
-  function clearDone() {
-    saveNotes(loadNotes().filter(n => !n.done));
+  async function clearDone() {
+    _notes = _notes.filter(n => !n.done);
     renderNotes();
+    await notesApi('clear-done');
   }
 
   function toggleDetail() {
-    const d  = document.getElementById('note-detail');
+    const d   = document.getElementById('note-detail');
     const btn = document.getElementById('note-detail-toggle');
     const show = d.style.display === 'none';
     d.style.display = show ? 'block' : 'none';
@@ -484,7 +503,11 @@
   }
 
   document.addEventListener('DOMContentLoaded', () => {
-    renderNotes();
+    fetchNotes();
+    // Re-sync when tab becomes visible (switching back from another device)
+    document.addEventListener('visibilitychange', () => {
+      if (document.visibilityState === 'visible') fetchNotes();
+    });
     document.getElementById('note-input').addEventListener('keydown', e => {
       if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); addNote(); }
     });