diff --git a/apps/sandbox/templates/html-menu/main.ts b/apps/sandbox/templates/html-menu/main.ts
index f4778a41..6c86d5c3 100644
--- a/apps/sandbox/templates/html-menu/main.ts
+++ b/apps/sandbox/templates/html-menu/main.ts
@@ -21,7 +21,7 @@ const menuContentPlacementClass = [
 
 const menuContentClass = [
   menuContentSurfaceClass,
-  'transition-[opacity,scale,translate,filter] duration-150',
+  'transition-[opacity,scale,translate,filter] duration-150 ease-in-out',
   menuContentPlacementClass,
 ].join(' ');
 
@@ -68,7 +68,7 @@ const menuNavPopupClass = [
   'group relative',
   menuNavSurfaceClass,
   'w-(--media-menu-width) h-(--media-menu-height)',
-  'transition-[opacity,scale,translate,filter,width,height] duration-300 ease-in-out',
+  'transition-[opacity,scale,translate,filter,width,height] duration-150 ease-in-out',
   menuContentPlacementClass,
 ].join(' ');
 
@@ -87,7 +87,7 @@ root.innerHTML = `
     <div class="flex gap-4 flex-wrap justify-center">
 
       <!-- Radio group -->
-      <div class="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+      <div class="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
         <span class="text-xs font-medium text-slate-500 uppercase tracking-widest">Radio group</span>
         <button
           commandfor="quality-menu"
@@ -97,12 +97,12 @@ root.innerHTML = `
           <svg class="w-3.5 h-3.5 text-slate-400" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
         </button>
         <media-menu id="quality-menu" class="${menuContentClass}">
-          <media-menu-label class="${menuLabelClass}">Resolution</media-menu-label>
           <media-menu-radio-group id="quality-group" value="auto">
-            <media-menu-radio-item value="auto"   class="${radioItemClass}">Auto</media-menu-radio-item>
-            <media-menu-radio-item value="1080p"  class="${radioItemClass}">1080p</media-menu-radio-item>
-            <media-menu-radio-item value="720p"   class="${radioItemClass}">720p</media-menu-radio-item>
-            <media-menu-radio-item value="480p"   class="${radioItemClass}">480p</media-menu-radio-item>
+            <media-menu-label class="${menuLabelClass}">Resolution</media-menu-label>
+            <media-menu-radio-item value="auto" class="${radioItemClass}">Auto</media-menu-radio-item>
+            <media-menu-radio-item value="1080p" class="${radioItemClass}">1080p</media-menu-radio-item>
+            <media-menu-radio-item value="720p" class="${radioItemClass}">720p</media-menu-radio-item>
+            <media-menu-radio-item value="480p" class="${radioItemClass}">480p</media-menu-radio-item>
             <media-menu-radio-item value="360p" disabled class="${radioItemClass}">360p (unavailable)</media-menu-radio-item>
           </media-menu-radio-group>
         </media-menu>
@@ -110,7 +110,7 @@ root.innerHTML = `
       </div>
 
       <!-- Mixed items -->
-      <div class="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+      <div class="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
         <span class="text-xs font-medium text-slate-500 uppercase tracking-widest">Mixed items</span>
         <button
           commandfor="settings-menu"
@@ -120,18 +120,20 @@ root.innerHTML = `
           <svg class="w-3.5 h-3.5 text-slate-400" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
         </button>
         <media-menu id="settings-menu" class="${menuContentClass}">
-          <media-menu-label class="${menuLabelClass}">Playback</media-menu-label>
-          <media-menu-checkbox-item id="loop-item"     class="${checkboxItemClass}">Loop</media-menu-checkbox-item>
-          <media-menu-checkbox-item id="autoplay-item" class="${checkboxItemClass}">Autoplay</media-menu-checkbox-item>
+          <media-menu-group>
+            <media-menu-label class="${menuLabelClass}">Playback</media-menu-label>
+            <media-menu-checkbox-item id="loop-item" class="${checkboxItemClass}">Loop</media-menu-checkbox-item>
+            <media-menu-checkbox-item id="autoplay-item" class="${checkboxItemClass}">Autoplay</media-menu-checkbox-item>
+          </media-menu-group>
           <media-menu-separator class="${menuSeparatorClass}"></media-menu-separator>
-          <media-menu-item id="copy-item"   class="${menuItemClass}">Copy link</media-menu-item>
+          <media-menu-item id="copy-item" class="${menuItemClass}">Copy link</media-menu-item>
           <media-menu-item id="report-item" class="${menuItemClass}">Report issue</media-menu-item>
         </media-menu>
         <p class="text-[0.8125rem] text-slate-500">Loop: <strong id="loop-output" class="text-slate-900 font-medium">off</strong></p>
       </div>
 
       <!-- Submenu navigation -->
-      <div class="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+      <div class="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
         <span class="text-xs font-medium text-slate-500 uppercase tracking-widest">Submenu</span>
         <button
           commandfor="nav-menu"
@@ -173,11 +175,11 @@ root.innerHTML = `
               <svg class="w-3.5 h-3.5 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="15 18 9 12 15 6"/></svg>
               Quality
             </media-menu-back>
-            <media-menu-radio-group id="nav-quality-group" value="auto">
-              <media-menu-radio-item value="auto"  class="${radioItemClass}">Auto</media-menu-radio-item>
+            <media-menu-radio-group id="nav-quality-group" aria-label="Resolution" value="auto">
+              <media-menu-radio-item value="auto" class="${radioItemClass}">Auto</media-menu-radio-item>
               <media-menu-radio-item value="1080p" class="${radioItemClass}">1080p</media-menu-radio-item>
-              <media-menu-radio-item value="720p"  class="${radioItemClass}">720p</media-menu-radio-item>
-              <media-menu-radio-item value="480p"  class="${radioItemClass}">480p</media-menu-radio-item>
+              <media-menu-radio-item value="720p" class="${radioItemClass}">720p</media-menu-radio-item>
+              <media-menu-radio-item value="480p" class="${radioItemClass}">480p</media-menu-radio-item>
             </media-menu-radio-group>
           </media-menu>
 
@@ -186,13 +188,13 @@ root.innerHTML = `
               <svg class="w-3.5 h-3.5 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="15 18 9 12 15 6"/></svg>
               Speed
             </media-menu-back>
-            <media-menu-radio-group id="nav-speed-group" value="1">
-              <media-menu-radio-item value="0.5"  class="${radioItemClass}">0.5x</media-menu-radio-item>
+            <media-menu-radio-group id="nav-speed-group" aria-label="Speed" value="1">
+              <media-menu-radio-item value="0.5" class="${radioItemClass}">0.5x</media-menu-radio-item>
               <media-menu-radio-item value="0.75" class="${radioItemClass}">0.75x</media-menu-radio-item>
-              <media-menu-radio-item value="1"    class="${radioItemClass}">Normal</media-menu-radio-item>
+              <media-menu-radio-item value="1" class="${radioItemClass}">Normal</media-menu-radio-item>
               <media-menu-radio-item value="1.25" class="${radioItemClass}">1.25x</media-menu-radio-item>
-              <media-menu-radio-item value="1.5"  class="${radioItemClass}">1.5x</media-menu-radio-item>
-              <media-menu-radio-item value="2"    class="${radioItemClass}">2x</media-menu-radio-item>
+              <media-menu-radio-item value="1.5" class="${radioItemClass}">1.5x</media-menu-radio-item>
+              <media-menu-radio-item value="2" class="${radioItemClass}">2x</media-menu-radio-item>
             </media-menu-radio-group>
           </media-menu>
         </media-menu>
diff --git a/apps/sandbox/templates/react-menu/main.tsx b/apps/sandbox/templates/react-menu/main.tsx
index cc345dad..4eb514a7 100644
--- a/apps/sandbox/templates/react-menu/main.tsx
+++ b/apps/sandbox/templates/react-menu/main.tsx
@@ -15,15 +15,15 @@ const menuNavSurfaceClass =
   'bg-white border-none ring-1 ring-black/10 shadow-sm rounded-md min-w-[10rem] overflow-hidden outline-none';
 
 const menuContentPlacementClass = [
-  'data-side=bottom:origin-top data-side=top:origin-bottom',
-  'data-side=left:origin-right data-side=right:origin-left',
+  'data-[side=bottom]:origin-top data-[side=top]:origin-bottom',
+  'data-[side=left]:origin-right data-[side=right]:origin-left',
   'data-starting-style:opacity-0 data-starting-style:scale-95 data-starting-style:-translate-y-1 data-starting-style:blur-sm',
   'data-ending-style:opacity-0 data-ending-style:scale-95 data-ending-style:-translate-y-1 data-ending-style:blur-sm',
 ].join(' ');
 
 const menuContentClass = [
   menuContentSurfaceClass,
-  'transition-[opacity,scale,translate,filter] duration-150',
+  'transition-[opacity,scale,translate,filter] duration-150 ease-in-out',
   menuContentPlacementClass,
 ].join(' ');
 
@@ -70,19 +70,19 @@ const menuNavPopupClass = [
   'group relative',
   menuNavSurfaceClass,
   'w-(--media-menu-width) h-(--media-menu-height)',
-  'transition-[opacity,scale,translate,filter,width,height] duration-300 ease-in-out',
+  'transition-[opacity,scale,translate,filter,width,height] duration-150 ease-in-out',
   menuContentPlacementClass,
 ].join(' ');
 
 // ── Indicators ────────────────────────────────────────────────────────────────
 
 function RadioDot() {
-  return <span className="absolute left-[0.5625rem] top-1/2 -translate-y-1/2 w-2 h-2 rounded-full bg-current" />;
+  return <span className="absolute left-2.25 top-1/2 -translate-y-1/2 w-2 h-2 rounded-full bg-current" />;
 }
 
 function Checkmark() {
   return (
-    <span className="absolute left-[0.4375rem] top-1/2 -translate-y-1/2 w-3 h-3 flex items-center justify-center">
+    <span className="absolute left-1.75 top-1/2 -translate-y-1/2 w-3 h-3 flex items-center justify-center">
       <svg
         aria-hidden="true"
         viewBox="0 0 24 24"
@@ -174,13 +174,13 @@ function App() {
 
       <div className="flex gap-4 flex-wrap justify-center">
         {/* Radio group */}
-        <div className="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+        <div className="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
           <span className="text-xs font-medium text-slate-500 uppercase tracking-widest">Radio group</span>
           <Menu.Root>
             <TriggerButton>Quality</TriggerButton>
             <Menu.Content className={menuContentClass}>
-              <Menu.Label className={menuLabelClass}>Resolution</Menu.Label>
               <Menu.RadioGroup value={quality} onValueChange={setQuality}>
+                <Menu.Label className={menuLabelClass}>Resolution</Menu.Label>
                 {['auto', '1080p', '720p', '480p'].map((value) => (
                   <Menu.RadioItem key={value} value={value} className={radioItemClass}>
                     {quality === value && <RadioDot />}
@@ -199,20 +199,22 @@ function App() {
         </div>
 
         {/* Mixed items */}
-        <div className="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+        <div className="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
           <span className="text-xs font-medium text-slate-500 uppercase tracking-widest">Mixed items</span>
           <Menu.Root>
             <TriggerButton>Settings</TriggerButton>
             <Menu.Content className={menuContentClass}>
-              <Menu.Label className={menuLabelClass}>Playback</Menu.Label>
-              <Menu.CheckboxItem checked={loop} onCheckedChange={setLoop} className={checkboxItemClass}>
-                {loop && <Checkmark />}
-                Loop
-              </Menu.CheckboxItem>
-              <Menu.CheckboxItem checked={autoplay} onCheckedChange={setAutoplay} className={checkboxItemClass}>
-                {autoplay && <Checkmark />}
-                Autoplay
-              </Menu.CheckboxItem>
+              <Menu.Group>
+                <Menu.Label className={menuLabelClass}>Playback</Menu.Label>
+                <Menu.CheckboxItem checked={loop} onCheckedChange={setLoop} className={checkboxItemClass}>
+                  {loop && <Checkmark />}
+                  Loop
+                </Menu.CheckboxItem>
+                <Menu.CheckboxItem checked={autoplay} onCheckedChange={setAutoplay} className={checkboxItemClass}>
+                  {autoplay && <Checkmark />}
+                  Autoplay
+                </Menu.CheckboxItem>
+              </Menu.Group>
               <Menu.Separator className={menuSeparatorClass} />
               <Menu.Item onSelect={() => console.log('copy link')} className={menuItemClass}>
                 Copy link
@@ -228,7 +230,7 @@ function App() {
         </div>
 
         {/* Submenu navigation */}
-        <div className="bg-white border border-slate-200 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-[0_1px_3px_0_rgb(0_0_0/.05)]">
+        <div className="bg-white ring-1 ring-slate-700/10 rounded-xl p-6 flex flex-col items-start gap-3.5 min-w-[200px] shadow-sm">
           <span className="text-xs font-medium text-slate-500 uppercase tracking-widest">Submenu</span>
           <Menu.Root>
             <TriggerButton>Settings</TriggerButton>
@@ -248,7 +250,7 @@ function App() {
                       <ChevronLeft />
                       Quality
                     </Menu.Back>
-                    <Menu.RadioGroup value={quality} onValueChange={setQuality}>
+                    <Menu.RadioGroup aria-label="Resolution" value={quality} onValueChange={setQuality}>
                       {['auto', '1080p', '720p', '480p'].map((v) => (
                         <Menu.RadioItem key={v} value={v} className={radioItemClass}>
                           {quality === v && <RadioDot />}
@@ -273,7 +275,7 @@ function App() {
                       <ChevronLeft />
                       Speed
                     </Menu.Back>
-                    <Menu.RadioGroup value={speed} onValueChange={setSpeed}>
+                    <Menu.RadioGroup aria-label="Speed" value={speed} onValueChange={setSpeed}>
                       {[
                         { value: '0.5', label: '0.5x' },
                         { value: '0.75', label: '0.75x' },
diff --git a/packages/core/src/core/ui/menu/menu-core.ts b/packages/core/src/core/ui/menu/menu-core.ts
index 601cd8ef..ebc6e572 100644
--- a/packages/core/src/core/ui/menu/menu-core.ts
+++ b/packages/core/src/core/ui/menu/menu-core.ts
@@ -83,7 +83,7 @@ export class MenuCore {
   getTriggerAttrs(state: MenuState, contentId?: string) {
     return {
       'aria-haspopup': 'menu' as const,
-      'aria-expanded': state.open ? 'true' : 'false',
+      'aria-expanded': state.open && state.status !== 'ending' ? 'true' : 'false',
       'aria-controls': contentId,
     };
   }
diff --git a/packages/core/src/core/ui/menu/tests/menu-core.test.ts b/packages/core/src/core/ui/menu/tests/menu-core.test.ts
index 6286b2bb..8075eb34 100644
--- a/packages/core/src/core/ui/menu/tests/menu-core.test.ts
+++ b/packages/core/src/core/ui/menu/tests/menu-core.test.ts
@@ -114,6 +114,16 @@ describe('MenuCore', () => {
       expect(attrs['aria-expanded']).toBe('true');
     });
 
+    it('returns aria-expanded false when closing', () => {
+      const core = new MenuCore();
+      core.setInput(createInput({ active: true, status: 'ending' }));
+      const state = core.getState();
+      const attrs = core.getTriggerAttrs(state);
+
+      expect(state.open).toBe(true);
+      expect(attrs['aria-expanded']).toBe('false');
+    });
+
     it('sets aria-controls when contentId is provided', () => {
       const core = new MenuCore();
       core.setInput(createInput());
diff --git a/packages/core/src/core/ui/popover/popover-core.ts b/packages/core/src/core/ui/popover/popover-core.ts
index 0d711b6d..203de30f 100644
--- a/packages/core/src/core/ui/popover/popover-core.ts
+++ b/packages/core/src/core/ui/popover/popover-core.ts
@@ -94,7 +94,7 @@ export class PopoverCore {
 
   getTriggerAttrs(state: PopoverState, popupId?: string) {
     return {
-      'aria-expanded': state.open ? 'true' : 'false',
+      'aria-expanded': state.open && state.status !== 'ending' ? 'true' : 'false',
       'aria-haspopup': 'dialog',
       'aria-controls': popupId,
     };
diff --git a/packages/core/src/core/ui/popover/tests/popover-core.test.ts b/packages/core/src/core/ui/popover/tests/popover-core.test.ts
index 78e17aed..f7a02d86 100644
--- a/packages/core/src/core/ui/popover/tests/popover-core.test.ts
+++ b/packages/core/src/core/ui/popover/tests/popover-core.test.ts
@@ -69,6 +69,16 @@ describe('PopoverCore', () => {
       expect(attrs['aria-expanded']).toBe('true');
     });
 
+    it('returns aria-expanded false when closing', () => {
+      const core = new PopoverCore();
+      core.setInput({ active: true, status: 'ending' });
+      const state = core.getState();
+      const attrs = core.getTriggerAttrs(state);
+
+      expect(state.open).toBe(true);
+      expect(attrs['aria-expanded']).toBe('false');
+    });
+
     it('includes aria-controls when popupId is provided', () => {
       const core = new PopoverCore();
       core.setInput(OPEN);