diff --git a/dsh-plugin-desktop/src/native-ui/components/ui/radio-group.tsx b/dsh-plugin-desktop/src/native-ui/components/ui/radio-group.tsx
new file mode 100644
index 0000000000..df0fd535cb
--- /dev/null
+++ b/dsh-plugin-desktop/src/native-ui/components/ui/radio-group.tsx
@@ -0,0 +1,35 @@
+import { Radio as RadioPrimitive } from '@base-ui/react/radio'
+import { RadioGroup as RadioGroupPrimitive } from '@base-ui/react/radio-group'
+import { cn } from '../../lib/utils.ts'
+
+function RadioGroup({ className, ...props }: RadioGroupPrimitive.Props): JSX.Element {
+  return (
+    <RadioGroupPrimitive
+      className={cn('grid w-full gap-3', className)}
+      data-slot="radio-group"
+      {...props}
+    />
+  )
+}
+
+function RadioGroupItem({ className, ...props }: RadioPrimitive.Root.Props): JSX.Element {
+  return (
+    <RadioPrimitive.Root
+      className={cn(
+        'group/radio-group-item peer relative flex aspect-square size-4 shrink-0 rounded-2xl border border-transparent bg-input/90 outline-none group-has-[:focus-visible]/field-label:border-transparent group-has-[:focus-visible]/field-label:ring-0 after:absolute after:-inset-x-3 after:-inset-y-2 focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/30 disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 data-checked:bg-primary data-checked:text-primary-foreground dark:data-checked:bg-primary',
+        className,
+      )}
+      data-slot="radio-group-item"
+      {...props}
+    >
+      <RadioPrimitive.Indicator
+        className="flex size-4 items-center justify-center"
+        data-slot="radio-group-indicator"
+      >
+        <span className="absolute top-1/2 left-1/2 size-2 -translate-x-1/2 -translate-y-1/2 rounded-full bg-primary-foreground dark:size-2.5" />
+      </RadioPrimitive.Indicator>
+    </RadioPrimitive.Root>
+  )
+}
+
+export { RadioGroup, RadioGroupItem }
diff --git a/dsh-plugin-desktop/src/native-ui/setup-wizard/App.tsx b/dsh-plugin-desktop/src/native-ui/setup-wizard/App.tsx
index 4fd8980b7e..1251ab62b7 100644
--- a/dsh-plugin-desktop/src/native-ui/setup-wizard/App.tsx
+++ b/dsh-plugin-desktop/src/native-ui/setup-wizard/App.tsx
@@ -3,7 +3,6 @@ import {
   AlertTriangle,
   ArrowLeft,
   ArrowRight,
-  Check,
   CheckCircle2,
   SkipForward,
 } from 'lucide-react'
@@ -34,6 +33,7 @@ import {
   DialogTrigger,
 } from '../components/ui/dialog.tsx'
 import { Label } from '../components/ui/label.tsx'
+import { RadioGroup, RadioGroupItem } from '../components/ui/radio-group.tsx'
 import { Switch } from '../components/ui/switch.tsx'
 import { DesktopFrame } from '../shared/DesktopFrame.tsx'
 
@@ -146,29 +146,27 @@ function finish(selection: DesktopSetupWizardSelection): void {
 }
 
 function Choice({
+  id,
+  value,
   title,
   body,
   selected,
   disabled = false,
-  onSelect,
 }: {
+  readonly id: string
+  readonly value: string
   readonly title: string
   readonly body: string
   readonly selected: boolean
   readonly disabled?: boolean
-  readonly onSelect: () => void
 }): JSX.Element {
-  return <button
-    aria-checked={selected}
-    className={`flex w-full items-start gap-3 rounded-xl border p-4 text-left outline-none transition-colors focus-visible:ring-3 focus-visible:ring-ring/30 ${selected ? 'border-primary bg-muted/70' : 'hover:bg-muted/40'}`}
-    disabled={disabled}
-    onClick={onSelect}
-    role="radio"
-    type="button"
+  return <Label
+    className={`flex w-full items-start gap-3 rounded-xl border p-4 text-left leading-normal outline-none transition-colors ${disabled ? 'cursor-not-allowed opacity-50' : 'cursor-pointer'} ${selected ? 'border-primary bg-muted/70' : 'hover:bg-muted/40'}`}
+    htmlFor={id}
   >
-    <span aria-hidden="true" className={`mt-0.5 flex size-5 shrink-0 items-center justify-center rounded-full border ${selected ? 'border-primary bg-primary text-primary-foreground' : 'border-muted-foreground/60'}`}>{selected ? <Check className="size-3" /> : null}</span>
+    <RadioGroupItem className="mt-0.5" disabled={disabled} id={id} value={value} />
     <span className="min-w-0"><span className="block text-sm font-medium">{title}</span><span className="mt-1 block text-xs leading-relaxed text-muted-foreground">{body}</span></span>
-  </button>
+  </Label>
 }
 
 function ToggleRow({
@@ -212,7 +210,7 @@ function Page({
   readonly subtitle: string
   readonly children: ReactNode
 }): JSX.Element {
-  return <div className="mx-auto flex w-full max-w-2xl flex-col py-5" data-setup-step={step}>
+  return <div className="mx-auto flex w-full max-w-2xl flex-col py-5" data-orientation="vertical" data-setup-step={step}>
     <header className="mb-6">
       <h1 className="text-2xl font-semibold tracking-tight">{title}</h1>
       <p className="mt-2 text-sm leading-relaxed text-muted-foreground">{subtitle}</p>
@@ -237,14 +235,25 @@ function ModeOptions({
     { value: 'extended', title: copy.extendedMode, body: input.platform === 'linux' ? copy.unavailableOnLinux : copy.extendedModeBody },
     { value: 'advanced', title: copy.advancedMode, body: input.platform === 'linux' ? copy.unavailableOnLinux : copy.advancedModeBody },
   ]
-  return <div aria-orientation="vertical" className="space-y-3" role="radiogroup">{modes.map(option => <Choice
+  return <RadioGroup
+    aria-label={copy.presentationTitle}
+    aria-orientation="vertical"
+    name="setup-window-mode"
+    onValueChange={value => {
+      if (value === 'compatibility' || value === 'extended' || value === 'advanced') {
+        update({ ...selection, mode: value })
+      }
+    }}
+    value={selection.mode}
+  >{modes.map(option => <Choice
     body={option.body}
     disabled={input.platform === 'linux' && option.value !== 'compatibility'}
+    id={`setup-window-mode-${option.value}`}
     key={option.value}
-    onSelect={() => { update({ ...selection, mode: option.value }) }}
     selected={selection.mode === option.value}
     title={option.title}
-  />)}</div>
+    value={option.value}
+  />)}</RadioGroup>
 }
 
 type MaterialOption = {
@@ -283,14 +292,23 @@ function MaterialOptions({
       update({ ...selection, windowsMaterial: value })
     }
   }
-  return <div aria-orientation="vertical" className="space-y-3" role="radiogroup">{options.map(option => <Choice
+  return <RadioGroup
+    aria-label={copy.windowMaterial}
+    aria-orientation="vertical"
+    name="setup-window-material"
+    onValueChange={value => {
+      if (value === 'off' || value === 'transparent' || value === 'acrylic' || value === 'mica') choose(value)
+    }}
+    value={selected}
+  >{options.map(option => <Choice
     body={option.body}
     disabled={input.platform === 'linux'}
+    id={`setup-window-material-${option.value}`}
     key={option.value}
-    onSelect={() => { choose(option.value) }}
     selected={selected === option.value}
     title={option.title}
-  />)}</div>
+    value={option.value}
+  />)}</RadioGroup>
 }
 
 function MarketOptions({
@@ -307,13 +325,24 @@ function MarketOptions({
     { value: 'community-market', title: copy.communityMarket, body: copy.communityMarketBody },
     { value: 'dsh-market', title: copy.dshMarket, body: copy.dshMarketBody },
   ]
-  return <div aria-orientation="vertical" className="space-y-3" role="radiogroup">{markets.map(option => <Choice
+  return <RadioGroup
+    aria-label={copy.marketTitle}
+    aria-orientation="vertical"
+    name="setup-plugin-market"
+    onValueChange={value => {
+      if (value === 'disabled' || value === 'community-market' || value === 'dsh-market') {
+        update({ ...selection, market: value })
+      }
+    }}
+    value={selection.market}
+  >{markets.map(option => <Choice
     body={option.body}
+    id={`setup-plugin-market-${option.value}`}
     key={option.value}
-    onSelect={() => { update({ ...selection, market: option.value }) }}
     selected={selection.market === option.value}
     title={option.title}
-  />)}</div>
+    value={option.value}
+  />)}</RadioGroup>
 }
 
 function NotificationOptions({
@@ -328,7 +357,7 @@ function NotificationOptions({
   const set = (key: keyof DesktopSetupWizardNotifications, checked: boolean): void => {
     update({ ...notifications, [key]: checked })
   }
-  return <div aria-orientation="vertical" className="space-y-3">
+  return <div className="space-y-3" data-orientation="vertical">
     <ToggleRow checked={notifications.enabled} id="setup-notifications-enabled" label={copy.notificationsEnabled} onChange={checked => { set('enabled', checked) }} />
     <div className="space-y-3 border-l pl-4">
       <ToggleRow checked={notifications.notifyOnTurnCompletion} disabled={!notifications.enabled} id="setup-turn-completion" label={copy.turnCompletion} onChange={checked => { set('notifyOnTurnCompletion', checked) }} />
@@ -355,10 +384,19 @@ function BrowserOptions({
     <section>
       <h2 className="text-sm font-semibold">{copy.networkExposure}</h2>
       <p className="mt-1 text-xs leading-relaxed text-muted-foreground">{copy.networkExposureBody}</p>
-      <div aria-orientation="vertical" className="mt-3 space-y-3" role="radiogroup">
-        <Choice body={copy.loopbackBody} onSelect={() => { requestExposure('loopback') }} selected={selection.networkExposure === 'loopback'} title={copy.loopback} />
-        <Choice body={copy.lanBody} onSelect={() => { requestExposure('lan') }} selected={selection.networkExposure === 'lan'} title={copy.lan} />
-      </div>
+      <RadioGroup
+        aria-label={copy.networkExposure}
+        aria-orientation="vertical"
+        className="mt-3"
+        name="setup-network-exposure"
+        onValueChange={value => {
+          if (value === 'loopback' || value === 'lan') requestExposure(value)
+        }}
+        value={selection.networkExposure}
+      >
+        <Choice body={copy.loopbackBody} id="setup-network-exposure-loopback" selected={selection.networkExposure === 'loopback'} title={copy.loopback} value="loopback" />
+        <Choice body={copy.lanBody} id="setup-network-exposure-lan" selected={selection.networkExposure === 'lan'} title={copy.lan} value="lan" />
+      </RadioGroup>
     </section>
   </div>
 }
@@ -467,8 +505,8 @@ export function SetupWizardLanConfirmation({ copy, confirm, cancel }: {
         </div>
       </DialogHeader>
       <DialogFooter>
-        <Button onClick={cancel} type="button" variant="outline">{copy.cancelLan}</Button>
-        <Button autoFocus onClick={confirm} type="button" variant="destructive"><AlertTriangle />{copy.confirmLan}</Button>
+        <DialogClose render={<Button autoFocus type="button" variant="outline" />}>{copy.cancelLan}</DialogClose>
+        <Button onClick={confirm} type="button" variant="destructive"><AlertTriangle />{copy.confirmLan}</Button>
       </DialogFooter>
     </DialogContent>
   </Dialog>
diff --git a/dsh-plugin-desktop/src/native-ui/shared/theme.css b/dsh-plugin-desktop/src/native-ui/shared/theme.css
index eafc2a054f..e0cb93219f 100644
--- a/dsh-plugin-desktop/src/native-ui/shared/theme.css
+++ b/dsh-plugin-desktop/src/native-ui/shared/theme.css
@@ -67,6 +67,7 @@
 @layer base {
   * { @apply border-border outline-ring/50; }
   html, body, #root { width: 100%; height: 100%; }
+  #root { isolation: isolate; }
   html.dshDesktopDialogDocument,
   html.dshDesktopDialogDocument body,
   html.dshDesktopDialogDocument #root { height: auto; min-height: 0; }
diff --git a/dsh-plugin-desktop/tests/native-ui-frame.spec.ts b/dsh-plugin-desktop/tests/native-ui-frame.spec.ts
index 7b609d49c1..b9ff42ceea 100644
--- a/dsh-plugin-desktop/tests/native-ui-frame.spec.ts
+++ b/dsh-plugin-desktop/tests/native-ui-frame.spec.ts
@@ -17,4 +17,8 @@ describe('Desktop-owned native UI frame', () => {
     expect(theme).toContain('.dshNativeFrame ~ .dshNativeContent')
     expect(theme).not.toContain('.dshNativeFrame + .dshNativeContent')
   })
+
+  it('isolates the app root so body-level dialogs cover the high native frame layer', () => {
+    expect(theme).toMatch(/#root\s*\{\s*isolation:\s*isolate;/u)
+  })
 })
diff --git a/dsh-plugin-desktop/tests/setup-wizard-native-ui.spec.ts b/dsh-plugin-desktop/tests/setup-wizard-native-ui.spec.ts
index 1a06518b0d..be4e015a41 100644
--- a/dsh-plugin-desktop/tests/setup-wizard-native-ui.spec.ts
+++ b/dsh-plugin-desktop/tests/setup-wizard-native-ui.spec.ts
@@ -16,6 +16,8 @@ import {
   SetupWizardStepPage,
   SetupWizardSuccess,
 } from '../src/native-ui/setup-wizard/App.tsx'
+import { Button } from '../src/native-ui/components/ui/button.tsx'
+import { DialogClose } from '../src/native-ui/components/ui/dialog.tsx'
 import { desktopSetupWizardCopy } from '../src/setup-wizard-copy.ts'
 
 const input: DesktopSetupWizardInput = {
@@ -70,6 +72,16 @@ function elementText(node: ReactNode): string {
   return elementText((node.props as { readonly children?: ReactNode }).children)
 }
 
+function elementTree(node: ReactNode): readonly ReactElement[] {
+  const elements: ReactElement[] = []
+  Children.forEach(node, child => {
+    if (!isValidElement(child)) return
+    elements.push(child)
+    elements.push(...elementTree((child.props as { readonly children?: ReactNode }).children))
+  })
+  return elements
+}
+
 afterEach(() => { vi.unstubAllGlobals() })
 
 describe('Setup Wizard step flow', () => {
@@ -122,10 +134,22 @@ describe('Setup Wizard setting pages', () => {
   it.each(['mode', 'material', 'market', 'notifications', 'browser'] as const)(
     'lays out the %s page options vertically',
     (step) => {
-      expect(renderStep(step)).toContain('aria-orientation="vertical"')
+      expect(renderStep(step)).toContain('data-orientation="vertical"')
     },
   )
 
+  it.each([
+    ['mode', copy.presentationTitle],
+    ['material', copy.windowMaterial],
+    ['market', copy.marketTitle],
+    ['browser', copy.networkExposure],
+  ] as const)('uses a named shadcn RadioGroup for the %s choices', (step, accessibleName) => {
+    const markup = renderStep(step)
+    expect(markup).toContain('data-slot="radio-group"')
+    expect(markup).toContain(`aria-label="${accessibleName}"`)
+    expect(markup).toContain('data-slot="radio-group-item"')
+  })
+
   it('does not combine the plugin market and browser settings', () => {
     const market = renderStep('market')
     const browser = renderStep('browser')
@@ -238,6 +262,15 @@ describe('Setup Wizard native UI boundaries', () => {
     expect(text).toContain('这样很危险，所有在你局域网内的人都能直接操作你的电脑，请谨慎开启')
     expect(text).toContain('确认开启局域网访问')
     expect(text).toContain('保持仅本机访问')
+    const descendants = elementTree(content)
+    const close = descendants.find(element => element.type === DialogClose)
+    const confirm = descendants.find(element => element.type === Button
+      && elementText(element).includes(copy.confirmLan)
+      && (element.props as { readonly variant?: string }).variant === 'destructive')
+    expect(close).toBeDefined()
+    expect((close?.props as { readonly render?: ReactElement }).render?.props).toMatchObject({ autoFocus: true })
+    expect(confirm).toBeDefined()
+    expect((confirm?.props as { readonly autoFocus?: boolean }).autoFocus).not.toBe(true)
   })
 
   it('decodes only the exact bounded state tuple emitted by the owner window', () => {