diff --git a/Jellyfin.Plugin.JellyLMS/Web/remote-button.js b/Jellyfin.Plugin.JellyLMS/Web/remote-button.js
index 20b8350..6981e15 100644
--- a/Jellyfin.Plugin.JellyLMS/Web/remote-button.js
+++ b/Jellyfin.Plugin.JellyLMS/Web/remote-button.js
@@ -1,5 +1,6 @@
 (function () {
     var hasAccess = false;
+    var panel = null;
 
     function getAuthToken() {
         try {
@@ -11,17 +12,233 @@
         }
     }
 
-    function checkAccess() {
+    function api(path, options) {
         var token = getAuthToken();
-        if (!token) {
-            return Promise.resolve(false);
+        var opts = Object.assign({ headers: {} }, options);
+        if (token) {
+            opts.headers['X-Emby-Token'] = token;
         }
 
-        return fetch('/JellyLms/RemoteControl/Access', { headers: { 'X-Emby-Token': token } })
-            .then(function (resp) { return resp.ok; })
+        if (opts.body && typeof opts.body === 'object') {
+            opts.body = JSON.stringify(opts.body);
+            opts.headers['Content-Type'] = 'application/json';
+        }
+
+        return fetch('/JellyLms' + path, opts);
+    }
+
+    function checkAccess() {
+        return api('/RemoteControl/Access')
+            .then(function (r) { return r.ok; })
             .catch(function () { return false; });
     }
 
+    // ---------- panel ----------
+
+    function createPanel(anchorBtn) {
+        var p = document.createElement('div');
+        p.id = 'jellylms-panel';
+        p.style.cssText = [
+            'position:fixed',
+            'top:' + (anchorBtn.getBoundingClientRect().bottom + 4) + 'px',
+            'right:' + (window.innerWidth - anchorBtn.getBoundingClientRect().right) + 'px',
+            'width:300px',
+            'max-height:70vh',
+            'overflow-y:auto',
+            'background:#1c1c1c',
+            'border:1px solid #333',
+            'border-radius:4px',
+            'box-shadow:0 4px 24px rgba(0,0,0,.7)',
+            'z-index:999999',
+            'font-family:inherit',
+            'font-size:14px',
+            'color:#ddd',
+            'padding:12px',
+        ].join(';');
+        return p;
+    }
+
+    function el(tag, css, html) {
+        var e = document.createElement(tag);
+        if (css) { e.style.cssText = css; }
+        if (html != null) { e.innerHTML = html; }
+        return e;
+    }
+
+    function renderError(p, msg) {
+        p.innerHTML = '<div style="color:#f44;padding:8px">' + msg + '</div>';
+    }
+
+    function renderPlayers(p, players, groups) {
+        p.innerHTML = '';
+
+        var masterMacs = {};
+        groups.forEach(function (g) {
+            masterMacs[g.masterMac] = g;
+            (g.slaveMacs || []).forEach(function (s) { masterMacs[s] = g; });
+        });
+
+        // ---- Players ----
+        var hdr = el('div', 'font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#888;margin-bottom:6px', 'Players');
+        p.appendChild(hdr);
+
+        players.forEach(function (player) {
+            var row = el('div', 'display:flex;align-items:center;gap:8px;margin-bottom:10px');
+
+            var dot = el('span',
+                'width:8px;height:8px;border-radius:50%;flex-shrink:0;background:' +
+                (player.isConnected ? '#4caf50' : '#555'));
+            row.appendChild(dot);
+
+            var name = el('span', 'flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap', player.name);
+            row.appendChild(name);
+
+            var pwrBtn = el('button',
+                'background:none;border:1px solid #555;border-radius:3px;color:#ddd;' +
+                'padding:2px 7px;cursor:pointer;font-size:12px;flex-shrink:0',
+                player.isPoweredOn ? 'Off' : 'On');
+            pwrBtn.title = player.isPoweredOn ? 'Power off' : 'Power on';
+            pwrBtn.addEventListener('click', function () {
+                var endpoint = player.isPoweredOn ? '/Players/' + player.mac + '/PowerOff' : '/Players/' + player.mac + '/PowerOn';
+                api(endpoint, { method: 'POST' }).then(function () { refresh(p); });
+            });
+            row.appendChild(pwrBtn);
+
+            p.appendChild(row);
+
+            if (player.isConnected) {
+                var volRow = el('div', 'display:flex;align-items:center;gap:8px;margin-bottom:10px;padding-left:16px');
+                var volIcon = el('span', 'color:#888;font-size:16px;font-family:\'Material Icons\';line-height:1', 'volume_up');
+                volRow.appendChild(volIcon);
+
+                var slider = el('input');
+                slider.type = 'range';
+                slider.min = 0;
+                slider.max = 100;
+                slider.value = player.volume || 0;
+                slider.style.cssText = 'flex:1;accent-color:#00a4dc';
+                slider.addEventListener('change', function () {
+                    api('/Players/' + player.mac + '/Volume', { method: 'POST', body: { volume: parseInt(slider.value, 10) } });
+                });
+                volRow.appendChild(slider);
+
+                var volVal = el('span', 'color:#888;font-size:12px;width:28px;text-align:right', player.volume + '%');
+                slider.addEventListener('input', function () { volVal.textContent = slider.value + '%'; });
+                volRow.appendChild(volVal);
+
+                p.appendChild(volRow);
+            }
+        });
+
+        // ---- Sync Groups ----
+        if (groups.length > 0) {
+            var sep = el('div', 'border-top:1px solid #333;margin:8px 0');
+            p.appendChild(sep);
+
+            var ghdr = el('div', 'font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#888;margin-bottom:6px', 'Sync Groups');
+            p.appendChild(ghdr);
+
+            groups.forEach(function (g) {
+                var master = players.find(function (pl) { return pl.mac === g.masterMac; });
+                var slaves = (g.slaveMacs || []).map(function (m) {
+                    return players.find(function (pl) { return pl.mac === m; });
+                }).filter(Boolean);
+
+                var names = [master ? master.name : g.masterMac]
+                    .concat(slaves.map(function (s) { return s.name; }))
+                    .join(' + ');
+
+                var grow = el('div', 'display:flex;align-items:center;gap:8px;margin-bottom:8px');
+                var glabel = el('span', 'flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px', names);
+                grow.appendChild(glabel);
+
+                var dissolveBtn = el('button',
+                    'background:none;border:1px solid #555;border-radius:3px;color:#f88;' +
+                    'padding:2px 7px;cursor:pointer;font-size:12px;flex-shrink:0',
+                    'Unsync');
+                dissolveBtn.addEventListener('click', function () {
+                    api('/SyncGroups/' + g.masterMac, { method: 'DELETE' }).then(function () { refresh(p); });
+                });
+                grow.appendChild(dissolveBtn);
+                p.appendChild(grow);
+            });
+        }
+
+        // ---- Create Sync Group ----
+        var unsynced = players.filter(function (pl) {
+            return !masterMacs[pl.mac] && pl.isConnected;
+        });
+
+        if (unsynced.length >= 2) {
+            var sep2 = el('div', 'border-top:1px solid #333;margin:8px 0');
+            p.appendChild(sep2);
+
+            var shdr = el('div', 'font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#888;margin-bottom:6px', 'Create Sync Group');
+            p.appendChild(shdr);
+
+            var checkboxes = [];
+            unsynced.forEach(function (pl) {
+                var crow = el('div', 'display:flex;align-items:center;gap:8px;margin-bottom:6px');
+                var cb = document.createElement('input');
+                cb.type = 'checkbox';
+                cb.style.accentColor = '#00a4dc';
+                cb.dataset.mac = pl.mac;
+                checkboxes.push(cb);
+                crow.appendChild(cb);
+                crow.appendChild(el('span', 'flex:1', pl.name));
+                p.appendChild(crow);
+            });
+
+            var syncBtn = el('button',
+                'margin-top:6px;width:100%;background:#00a4dc;border:none;border-radius:3px;' +
+                'color:#fff;padding:5px 0;cursor:pointer;font-size:13px',
+                'Sync Selected');
+            syncBtn.addEventListener('click', function () {
+                var selected = checkboxes.filter(function (cb) { return cb.checked; });
+                if (selected.length < 2) { return; }
+                var macs = selected.map(function (cb) { return cb.dataset.mac; });
+                api('/SyncGroups', {
+                    method: 'POST',
+                    body: { masterMac: macs[0], slaveMacs: macs.slice(1) }
+                }).then(function () { refresh(p); });
+            });
+            p.appendChild(syncBtn);
+        }
+    }
+
+    function refresh(p) {
+        p.innerHTML = '<div style="color:#888;padding:8px">Loading…</div>';
+        Promise.all([
+            api('/Players').then(function (r) { return r.json(); }),
+            api('/SyncGroups').then(function (r) { return r.json(); })
+        ]).then(function (results) {
+            renderPlayers(p, results[0], results[1]);
+        }).catch(function () {
+            renderError(p, 'Failed to load players.');
+        });
+    }
+
+    function togglePanel(btn) {
+        if (panel) {
+            panel.remove();
+            panel = null;
+            return;
+        }
+
+        panel = createPanel(btn);
+        document.body.appendChild(panel);
+        refresh(panel, btn);
+    }
+
+    function closePanel() {
+        if (panel) {
+            panel.remove();
+            panel = null;
+        }
+    }
+
+    // ---------- header button ----------
+
     function addButton(headerRight) {
         if (headerRight.querySelector('.headerLmsRemoteButton')) {
             return;
@@ -33,8 +250,9 @@
         btn.className = 'headerLmsRemoteButton headerButton headerButtonRight paper-icon-button-light';
         btn.title = 'Multi-room Remote';
         btn.innerHTML = '<span class="material-icons speaker_group" aria-hidden="true"></span>';
-        btn.addEventListener('click', function () {
-            window.location.href = '/JellyLms/RemoteControl';
+        btn.addEventListener('click', function (e) {
+            e.stopPropagation();
+            togglePanel(btn);
         });
 
         var castButton = headerRight.querySelector('.headerCastButton');
@@ -46,27 +264,34 @@
     }
 
     function tryInject() {
-        if (!hasAccess) {
-            return;
-        }
-
+        if (!hasAccess) { return; }
         var headerRight = document.querySelector('.headerRight');
-        if (headerRight) {
-            addButton(headerRight);
-        }
+        if (headerRight) { addButton(headerRight); }
     }
 
+    // ---------- bootstrap ----------
+
     function init() {
         checkAccess().then(function (ok) {
             hasAccess = ok;
-            if (!ok) {
-                return;
-            }
+            if (!ok) { return; }
 
             tryInject();
 
-            var observer = new MutationObserver(tryInject);
+            var observer = new MutationObserver(function () {
+                // If our panel was removed by SPA navigation, clean up the reference
+                if (panel && !document.body.contains(panel)) {
+                    panel = null;
+                }
+                tryInject();
+            });
             observer.observe(document.body, { childList: true, subtree: true });
+
+            document.addEventListener('click', function (e) {
+                if (panel && !panel.contains(e.target)) {
+                    closePanel();
+                }
+            });
         });
     }