diff --git a/web/src/components/common/NotificationPreferences.tsx b/web/src/components/common/NotificationPreferences.tsx
new file mode 100644
index 0000000..7dfb6e6
--- /dev/null
+++ b/web/src/components/common/NotificationPreferences.tsx
@@ -0,0 +1,287 @@
+import { useState } from 'react'
+import {
+  AudioOutlined,
+  DeleteOutlined,
+  PlayCircleOutlined,
+  SoundOutlined,
+  UploadOutlined,
+} from '@ant-design/icons'
+import { Button, Popconfirm, Select, Slider, Switch, Tag, Upload, message as antMsg } from 'antd'
+import { useAgentNotifications } from '@/stores/notifications'
+import {
+  MAX_CUSTOM_SOUND_BYTES,
+  MAX_CUSTOM_SOUND_SECONDS,
+  SOUND_PRESETS,
+  SPEAK_MODES,
+  type SoundPresetId,
+} from '@/lib/notificationSettings'
+
+interface NotificationPreferencesProps {
+  className?: string
+}
+
+function formatDuration(seconds: number): string {
+  if (!Number.isFinite(seconds) || seconds <= 0) return ''
+  return `${seconds.toFixed(1)}s`
+}
+
+export default function NotificationPreferences({ className = '' }: NotificationPreferencesProps) {
+  const {
+    soundEnabled,
+    setSoundEnabled,
+    soundSource,
+    preset,
+    setPreset,
+    setSoundSource,
+    customSound,
+    volume,
+    setVolume,
+    previewSound,
+    uploadCustomSound,
+    removeCustomSound,
+    speakEnabled,
+    setSpeakEnabled,
+    speakMode,
+    setSpeakMode,
+    speakRate,
+    setSpeakRate,
+    voiceURI,
+    setVoiceURI,
+    voices,
+    ttsSupported,
+    previewSpeech,
+  } = useAgentNotifications()
+  const [uploading, setUploading] = useState(false)
+  const [removing, setRemoving] = useState(false)
+  const [previewing, setPreviewing] = useState(false)
+
+  const soundOptions = [
+    ...SOUND_PRESETS.map(item => ({ value: item.value, label: item.label })),
+    ...(customSound ? [{ value: 'custom', label: `自定义：${customSound.name}` }] : []),
+  ]
+  const selectedSound = soundSource === 'custom' && customSound ? 'custom' : preset
+  const voiceOptions = [
+    { value: '', label: '系统默认' },
+    ...voices.map(item => ({
+      value: item.voiceURI,
+      label: `${item.name}${item.lang ? ` · ${item.lang}` : ''}`,
+    })),
+  ]
+
+  const handleSoundChange = (value: string) => {
+    if (value === 'custom') {
+      setSoundSource('custom')
+      return
+    }
+    setPreset(value as SoundPresetId)
+  }
+
+  const handlePreview = async () => {
+    setPreviewing(true)
+    try {
+      await previewSound()
+    } catch {
+      antMsg.error('试听失败，请检查浏览器音频权限')
+    } finally {
+      window.setTimeout(() => setPreviewing(false), 500)
+    }
+  }
+
+  const handleUpload = async (file: File) => {
+    setUploading(true)
+    try {
+      await uploadCustomSound(file)
+      antMsg.success('自定义提示音已保存')
+      await previewSound()
+    } catch (e) {
+      antMsg.error(e instanceof Error ? e.message : '上传音频失败')
+    } finally {
+      setUploading(false)
+    }
+  }
+
+  const handleRemove = async () => {
+    setRemoving(true)
+    try {
+      await removeCustomSound()
+      antMsg.success('已删除自定义提示音')
+    } catch (e) {
+      antMsg.error(e instanceof Error ? e.message : '删除失败')
+    } finally {
+      setRemoving(false)
+    }
+  }
+
+  const handleSpeechPreview = () => {
+    if (!ttsSupported) {
+      antMsg.warning('当前浏览器不支持语音朗读')
+      return
+    }
+    if (!previewSpeech()) antMsg.error('语音试听失败，请检查系统语音设置')
+  }
+
+  return (
+    <div className={`rounded-2xl border border-slate-200/80 bg-white p-5 md:p-6 shadow-xs ${className}`}>
+      <div className="flex items-start justify-between gap-3 mb-5">
+        <div className="min-w-0">
+          <div className="flex items-center gap-2 text-sm font-bold text-slate-900">
+            <SoundOutlined className="text-blue-500" />
+            声音与朗读
+          </div>
+          <div className="text-xs text-slate-400 mt-1">仅保存在当前浏览器，换设备后需要重新设置</div>
+        </div>
+        <Tag color="blue" className="!m-0 !rounded-full !text-[10px]">本机设置</Tag>
+      </div>
+
+      <div className="space-y-4">
+        <div className="flex items-center justify-between gap-4">
+          <div className="min-w-0">
+            <div className="text-sm font-semibold text-slate-800">声音提醒</div>
+            <div className="text-xs text-slate-400 mt-0.5">收到访客消息时播放提示音</div>
+          </div>
+          <Switch checked={soundEnabled} onChange={setSoundEnabled} />
+        </div>
+
+        {soundEnabled && (
+          <div className="space-y-3 pl-3 border-l-2 border-blue-100">
+            <div className="flex items-center gap-3">
+              <div className="w-14 shrink-0 text-xs text-slate-500">提示音</div>
+              <Select
+                size="small"
+                className="flex-1 min-w-0"
+                value={selectedSound}
+                options={soundOptions}
+                onChange={handleSoundChange}
+              />
+              <Button
+                size="small"
+                icon={<PlayCircleOutlined />}
+                loading={previewing}
+                onClick={() => { void handlePreview() }}
+              >
+                试听
+              </Button>
+            </div>
+
+            <div className="flex items-center gap-3">
+              <div className="w-14 shrink-0 text-xs text-slate-500">音量</div>
+              <Slider
+                className="flex-1 !my-0"
+                min={0}
+                max={1}
+                step={0.05}
+                value={volume}
+                onChange={setVolume}
+              />
+              <span className="w-10 text-right text-[11px] tabular-nums text-slate-400">
+                {Math.round(volume * 100)}%
+              </span>
+            </div>
+
+            <div className="flex items-center gap-3">
+              <div className="w-14 shrink-0 text-xs text-slate-500">自定义</div>
+              <div className="flex-1 min-w-0">
+                {customSound ? (
+                  <div className="flex items-center gap-2 min-w-0 rounded-lg bg-slate-50 px-2.5 py-1.5">
+                    <AudioOutlined className="text-blue-500 shrink-0" />
+                    <span className="truncate text-xs text-slate-600">{customSound.name}</span>
+                    {customSound.duration > 0 && (
+                      <span className="shrink-0 text-[10px] text-slate-400">{formatDuration(customSound.duration)}</span>
+                    )}
+                  </div>
+                ) : (
+                  <span className="text-xs text-slate-400">未上传，使用上方预设音</span>
+                )}
+              </div>
+              <Upload
+                accept=".mp3,.wav,.ogg,.m4a,.aac,audio/*"
+                showUploadList={false}
+                beforeUpload={file => {
+                  void handleUpload(file)
+                  return Upload.LIST_IGNORE
+                }}
+              >
+                <Button size="small" icon={<UploadOutlined />} loading={uploading}>上传</Button>
+              </Upload>
+              {customSound && (
+                <Popconfirm
+                  title="删除自定义提示音？"
+                  description="删除后会恢复使用预设音"
+                  onConfirm={() => { void handleRemove() }}
+                  okText="删除"
+                  cancelText="取消"
+                >
+                  <Button size="small" danger icon={<DeleteOutlined />} loading={removing} aria-label="删除自定义提示音" />
+                </Popconfirm>
+              )}
+            </div>
+
+            <div className="text-[11px] leading-relaxed text-slate-400">
+              支持 mp3 / wav / ogg / m4a，文件不超过 {Math.round(MAX_CUSTOM_SOUND_BYTES / 1024 / 1024)}MB，
+              建议时长不超过 {MAX_CUSTOM_SOUND_SECONDS} 秒。
+            </div>
+          </div>
+        )}
+
+        <div className="border-t border-slate-100 pt-4">
+          <div className="flex items-center justify-between gap-4">
+            <div className="min-w-0">
+              <div className="text-sm font-semibold text-slate-800">消息朗读</div>
+              <div className="text-xs text-slate-400 mt-0.5">
+                {ttsSupported ? '使用系统语音播报新访客消息' : '当前浏览器不支持 Web Speech 朗读'}
+              </div>
+            </div>
+            <Switch checked={speakEnabled} disabled={!ttsSupported} onChange={setSpeakEnabled} />
+          </div>
+
+          {speakEnabled && ttsSupported && (
+            <div className="mt-3 space-y-3 pl-3 border-l-2 border-blue-100">
+              <div className="flex items-center gap-3">
+                <div className="w-14 shrink-0 text-xs text-slate-500">朗读内容</div>
+                <Select
+                  size="small"
+                  className="flex-1 min-w-0"
+                  value={speakMode}
+                  options={SPEAK_MODES.map(item => ({ value: item.value, label: item.label }))}
+                  onChange={setSpeakMode}
+                />
+              </div>
+              <div className="text-[11px] text-slate-400 pl-[68px] -mt-1">
+                {SPEAK_MODES.find(item => item.value === speakMode)?.desc}
+              </div>
+              <div className="flex items-center gap-3">
+                <div className="w-14 shrink-0 text-xs text-slate-500">语速</div>
+                <Slider
+                  className="flex-1 !my-0"
+                  min={0.6}
+                  max={1.6}
+                  step={0.05}
+                  value={speakRate}
+                  onChange={setSpeakRate}
+                />
+                <span className="w-10 text-right text-[11px] tabular-nums text-slate-400">
+                  {speakRate.toFixed(2)}x
+                </span>
+              </div>
+              <div className="flex items-center gap-3">
+                <div className="w-14 shrink-0 text-xs text-slate-500">音色</div>
+                <Select
+                  size="small"
+                  className="flex-1 min-w-0"
+                  value={voiceURI}
+                  options={voiceOptions}
+                  onChange={setVoiceURI}
+                />
+              </div>
+              <div className="flex items-center gap-3">
+                <div className="w-14 shrink-0" />
+                <Button size="small" icon={<AudioOutlined />} onClick={handleSpeechPreview}>试听朗读</Button>
+                <span className="text-[11px] text-slate-400">首次使用请先点击试听，部分浏览器需要用户交互才能播放</span>
+              </div>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
diff --git a/web/src/components/layout/AgentSidebar.tsx b/web/src/components/layout/AgentSidebar.tsx
index 0d8c680..d9cb509 100644
--- a/web/src/components/layout/AgentSidebar.tsx
+++ b/web/src/components/layout/AgentSidebar.tsx
@@ -4,11 +4,14 @@ import {
   AppstoreOutlined, HistoryOutlined, TeamOutlined,
   FileTextOutlined, BarChartOutlined, SettingOutlined, LogoutOutlined,
   ThunderboltOutlined, DownOutlined, StopOutlined, SafetyOutlined, BellOutlined, BellFilled,
+  SoundOutlined,
 } from '@ant-design/icons'
-import { Button, Dropdown, message as antMsg, Popover, Switch, Tooltip } from 'antd'
+import { Button, Dropdown, message as antMsg, Modal, Popover, Switch, Tooltip } from 'antd'
 import { useAuth } from '@/stores/auth'
 import { LogoIcon } from '@/components/common/Logo'
+import NotificationPreferences from '@/components/common/NotificationPreferences'
 import { useAgentNotifications } from '@/stores/notifications'
+import { SOUND_PRESETS } from '@/lib/notificationSettings'
 import type { AgentPresence } from '@/services/api'
 
 const menuItems = [
@@ -45,8 +48,14 @@ const AgentSidebar = () => {
     setSoundEnabled,
     setDesktopEnabled,
     requestDesktopPermission,
+    preset,
+    soundSource,
+    customSound,
+    volume,
   } = useAgentNotifications()
   const [switching, setSwitching] = useState(false)
+  const [notificationOpen, setNotificationOpen] = useState(false)
+  const [notificationSettingsOpen, setNotificationSettingsOpen] = useState(false)
 
   const visibleMenuItems = menuItems.filter(item => item.permissions.some(code => permissions.has(code)))
   const selectedKey = visibleMenuItems.find(item => location.pathname.startsWith(item.key))?.key || '/agent/dashboard'
@@ -72,6 +81,9 @@ const AgentSidebar = () => {
 
   const initial = (user?.nickname || user?.username || '客').slice(0, 1).toUpperCase()
   const current = presenceMeta(user?.status || 'online')
+  const soundLabel = soundSource === 'custom' && customSound
+    ? customSound.name
+    : SOUND_PRESETS.find(item => item.value === preset)?.label || '清脆叮咚'
 
   const notificationContent = (
     <div className="w-68 p-1 space-y-3.5">
@@ -79,6 +91,11 @@ const AgentSidebar = () => {
         <div>
           <div className="text-sm font-medium text-slate-800">声音提醒</div>
           <div className="text-xs text-slate-400">收到访客消息时播放提示音</div>
+          {soundEnabled && (
+            <div className="mt-0.5 text-[10px] text-blue-500 truncate max-w-44">
+              {soundLabel} · 音量 {Math.round(volume * 100)}%
+            </div>
+          )}
         </div>
         <Switch size="small" checked={soundEnabled} onChange={setSoundEnabled} />
       </div>
@@ -109,6 +126,20 @@ const AgentSidebar = () => {
           授权浏览器通知权限
         </Button>
       )}
+      <div className="pt-2 border-t border-slate-100">
+        <Button
+          type="text"
+          size="small"
+          icon={<SoundOutlined />}
+          className="!w-full !justify-start !h-8 !px-2 !text-xs !text-slate-600 hover:!text-blue-600 hover:!bg-blue-50"
+          onClick={() => {
+            setNotificationOpen(false)
+            setNotificationSettingsOpen(true)
+          }}
+        >
+          声音与朗读设置
+        </Button>
+      </div>
     </div>
   )
 
@@ -127,7 +158,14 @@ const AgentSidebar = () => {
           <span className="font-bold text-slate-900 text-[14px] leading-tight truncate">客服工作台</span>
           <span className="text-[10px] text-blue-600 font-semibold font-mono tracking-wider leading-none mt-0.5">KEFU CLOUD</span>
         </div>
-        <Popover trigger="click" placement="bottomRight" content={notificationContent} title={<span className="text-xs font-semibold text-slate-700">消息提醒设置</span>}>
+        <Popover
+          trigger="click"
+          placement="bottomRight"
+          open={notificationOpen}
+          onOpenChange={setNotificationOpen}
+          content={notificationContent}
+          title={<span className="text-xs font-semibold text-slate-700">消息提醒设置</span>}
+        >
           <button
             type="button"
             title="消息提醒设置"
@@ -222,6 +260,17 @@ const AgentSidebar = () => {
           </Tooltip>
         </div>
       </div>
+
+      <Modal
+        open={notificationSettingsOpen}
+        onCancel={() => setNotificationSettingsOpen(false)}
+        footer={null}
+        width={560}
+        title="声音与朗读设置"
+        styles={{ body: { padding: 12 } }}
+      >
+        <NotificationPreferences className="!border-0 !shadow-none" />
+      </Modal>
     </aside>
   )
 }
diff --git a/web/src/lib/notificationAudio.ts b/web/src/lib/notificationAudio.ts
new file mode 100644
index 0000000..b8edb78
--- /dev/null
+++ b/web/src/lib/notificationAudio.ts
@@ -0,0 +1,230 @@
+import type { CustomSoundMeta, SoundPresetId } from './notificationSettings'
+
+const DB_NAME = 'kefu_notification_audio'
+const DB_VERSION = 1
+const STORE_NAME = 'sounds'
+const CUSTOM_SOUND_KEY = 'custom'
+
+interface StoredSoundRecord extends CustomSoundMeta {
+  blob: Blob
+}
+
+const AUDIO_MIME_ALLOWLIST = [
+  'audio/mpeg',
+  'audio/mp3',
+  'audio/wav',
+  'audio/x-wav',
+  'audio/ogg',
+  'audio/webm',
+  'audio/mp4',
+  'audio/aac',
+]
+
+const AUDIO_EXTENSION_RE = /\.(mp3|wav|ogg|oga|m4a|aac|webm)$/i
+
+function openAudioDB(): Promise<IDBDatabase> {
+  return new Promise((resolve, reject) => {
+    if (typeof indexedDB === 'undefined') {
+      reject(new Error('当前浏览器不支持本地音频存储'))
+      return
+    }
+    const request = indexedDB.open(DB_NAME, DB_VERSION)
+    request.onupgradeneeded = () => {
+      const db = request.result
+      if (!db.objectStoreNames.contains(STORE_NAME)) db.createObjectStore(STORE_NAME)
+    }
+    request.onsuccess = () => resolve(request.result)
+    request.onerror = () => reject(request.error || new Error('打开本地音频存储失败'))
+  })
+}
+
+export function isSupportedAudioFile(file: File): boolean {
+  const mime = String(file.type || '').toLowerCase()
+  return AUDIO_MIME_ALLOWLIST.includes(mime) || AUDIO_EXTENSION_RE.test(file.name)
+}
+
+export function readAudioDuration(file: Blob): Promise<number> {
+  return new Promise(resolve => {
+    if (typeof window === 'undefined') {
+      resolve(0)
+      return
+    }
+    const url = URL.createObjectURL(file)
+    const audio = new Audio()
+    let settled = false
+    const finish = (duration: number) => {
+      if (settled) return
+      settled = true
+      window.clearTimeout(timer)
+      audio.removeAttribute('src')
+      URL.revokeObjectURL(url)
+      resolve(Number.isFinite(duration) && duration > 0 ? duration : 0)
+    }
+    const timer = window.setTimeout(() => finish(0), 5000)
+    audio.preload = 'metadata'
+    audio.onloadedmetadata = () => finish(audio.duration)
+    audio.onerror = () => finish(0)
+    audio.src = url
+  })
+}
+
+export async function saveCustomSound(blob: Blob, meta: CustomSoundMeta): Promise<void> {
+  const db = await openAudioDB()
+  await new Promise<void>((resolve, reject) => {
+    const tx = db.transaction(STORE_NAME, 'readwrite')
+    tx.objectStore(STORE_NAME).put({ ...meta, blob } satisfies StoredSoundRecord, CUSTOM_SOUND_KEY)
+    tx.oncomplete = () => resolve()
+    tx.onerror = () => reject(tx.error || new Error('保存自定义音频失败'))
+    tx.onabort = () => reject(tx.error || new Error('保存自定义音频被中止'))
+  })
+  db.close()
+}
+
+export async function loadCustomSound(): Promise<{ meta: CustomSoundMeta; blob: Blob } | null> {
+  if (typeof indexedDB === 'undefined') return null
+  const db = await openAudioDB()
+  const record = await new Promise<StoredSoundRecord | null>((resolve, reject) => {
+    const tx = db.transaction(STORE_NAME, 'readonly')
+    const request = tx.objectStore(STORE_NAME).get(CUSTOM_SOUND_KEY)
+    request.onsuccess = () => resolve((request.result as StoredSoundRecord | undefined) || null)
+    request.onerror = () => reject(request.error || new Error('读取自定义音频失败'))
+  })
+  db.close()
+  if (!record?.blob) return null
+  return {
+    meta: {
+      id: record.id,
+      name: record.name,
+      mime: record.mime,
+      size: record.size,
+      duration: record.duration,
+      savedAt: record.savedAt,
+    },
+    blob: record.blob,
+  }
+}
+
+export async function clearCustomSound(): Promise<void> {
+  if (typeof indexedDB === 'undefined') return
+  const db = await openAudioDB()
+  await new Promise<void>((resolve, reject) => {
+    const tx = db.transaction(STORE_NAME, 'readwrite')
+    tx.objectStore(STORE_NAME).delete(CUSTOM_SOUND_KEY)
+    tx.oncomplete = () => resolve()
+    tx.onerror = () => reject(tx.error || new Error('删除自定义音频失败'))
+  })
+  db.close()
+}
+
+export async function decodeAudioBlob(context: AudioContext, blob: Blob): Promise<AudioBuffer> {
+  const data = await blob.arrayBuffer()
+  return context.decodeAudioData(data)
+}
+
+interface Tone {
+  frequency: number
+  start: number
+  duration: number
+  type: OscillatorType
+  gain: number
+  slideTo?: number
+}
+
+const PRESET_PATTERNS: Record<SoundPresetId, Tone[]> = {
+  chime: [
+    { frequency: 880, start: 0, duration: 0.16, type: 'sine', gain: 0.26 },
+    { frequency: 660, start: 0.12, duration: 0.22, type: 'sine', gain: 0.2 },
+  ],
+  bell: [
+    { frequency: 1046.5, start: 0, duration: 0.34, type: 'triangle', gain: 0.2 },
+    { frequency: 1568, start: 0.02, duration: 0.48, type: 'sine', gain: 0.08 },
+    { frequency: 784, start: 0.08, duration: 0.4, type: 'sine', gain: 0.07 },
+  ],
+  pop: [
+    { frequency: 520, start: 0, duration: 0.09, type: 'sine', gain: 0.3, slideTo: 760 },
+    { frequency: 1040, start: 0.06, duration: 0.1, type: 'sine', gain: 0.12 },
+  ],
+  urgent: [
+    { frequency: 880, start: 0, duration: 0.11, type: 'triangle', gain: 0.22 },
+    { frequency: 880, start: 0.17, duration: 0.11, type: 'triangle', gain: 0.22 },
+    { frequency: 1174.7, start: 0.34, duration: 0.25, type: 'triangle', gain: 0.26 },
+  ],
+}
+
+export function playPresetSound(context: AudioContext, preset: SoundPresetId, volume: number): OscillatorNode[] {
+  const safeVolume = Math.min(1, Math.max(0, volume))
+  const base = context.currentTime + 0.01
+  const oscillators: OscillatorNode[] = []
+  for (const tone of PRESET_PATTERNS[preset] || PRESET_PATTERNS.chime) {
+    const start = base + tone.start
+    const end = start + tone.duration
+    const oscillator = context.createOscillator()
+    const gain = context.createGain()
+    oscillator.type = tone.type
+    oscillator.frequency.setValueAtTime(tone.frequency, start)
+    if (tone.slideTo) oscillator.frequency.exponentialRampToValueAtTime(tone.slideTo, end)
+    const peak = Math.max(0.0001, tone.gain * safeVolume)
+    gain.gain.setValueAtTime(0.0001, start)
+    gain.gain.exponentialRampToValueAtTime(peak, start + 0.012)
+    gain.gain.exponentialRampToValueAtTime(0.0001, end)
+    oscillator.connect(gain)
+    gain.connect(context.destination)
+    oscillator.start(start)
+    oscillator.stop(end + 0.03)
+    oscillators.push(oscillator)
+  }
+  return oscillators
+}
+
+export function playAudioBuffer(context: AudioContext, buffer: AudioBuffer, volume: number): AudioBufferSourceNode {
+  const source = context.createBufferSource()
+  const gain = context.createGain()
+  source.buffer = buffer
+  gain.gain.value = Math.min(1, Math.max(0, volume))
+  source.connect(gain)
+  gain.connect(context.destination)
+  source.start()
+  return source
+}
+
+export function isSpeechSupported(): boolean {
+  return typeof window !== 'undefined' && 'speechSynthesis' in window && 'SpeechSynthesisUtterance' in window
+}
+
+export function listSpeechVoices(): SpeechSynthesisVoice[] {
+  if (!isSpeechSupported()) return []
+  return window.speechSynthesis.getVoices().slice().sort((a, b) => {
+    const aZh = a.lang.toLowerCase().startsWith('zh') ? 0 : 1
+    const bZh = b.lang.toLowerCase().startsWith('zh') ? 0 : 1
+    if (aZh !== bZh) return aZh - bZh
+    return a.name.localeCompare(b.name)
+  })
+}
+
+export interface SpeakOptions {
+  voiceURI?: string
+  rate?: number
+  volume?: number
+  lang?: string
+}
+
+export function speakText(text: string, options: SpeakOptions = {}): boolean {
+  const content = text.trim()
+  if (!content || !isSpeechSupported()) return false
+  const synth = window.speechSynthesis
+  synth.cancel()
+  const utterance = new SpeechSynthesisUtterance(content)
+  utterance.lang = options.lang || 'zh-CN'
+  utterance.rate = Math.min(1.6, Math.max(0.6, options.rate ?? 1))
+  utterance.volume = Math.min(1, Math.max(0, options.volume ?? 0.8))
+  const voice = options.voiceURI
+    ? synth.getVoices().find(item => item.voiceURI === options.voiceURI)
+    : undefined
+  if (voice) utterance.voice = voice
+  synth.speak(utterance)
+  return true
+}
+
+export function cancelSpeech(): void {
+  if (isSpeechSupported()) window.speechSynthesis.cancel()
+}
diff --git a/web/src/lib/notificationSettings.ts b/web/src/lib/notificationSettings.ts
new file mode 100644
index 0000000..df36f07
--- /dev/null
+++ b/web/src/lib/notificationSettings.ts
@@ -0,0 +1,137 @@
+export type SoundPresetId = 'chime' | 'bell' | 'pop' | 'urgent'
+export type SoundSource = 'preset' | 'custom'
+export type SpeakMode = 'brief' | 'summary'
+
+export interface CustomSoundMeta {
+  id: string
+  name: string
+  mime: string
+  size: number
+  duration: number
+  savedAt: number
+}
+
+export interface NotificationPreferences {
+  version: 1
+  soundEnabled: boolean
+  desktopEnabled: boolean
+  soundSource: SoundSource
+  preset: SoundPresetId
+  volume: number
+  customSound: CustomSoundMeta | null
+  speakEnabled: boolean
+  speakMode: SpeakMode
+  speakRate: number
+  voiceURI: string
+}
+
+export const SOUND_PRESETS: { value: SoundPresetId; label: string; desc: string }[] = [
+  { value: 'chime', label: '清脆叮咚', desc: '双音提示，适合日常消息' },
+  { value: 'bell', label: '轻铃', desc: '柔和铃声，适合安静环境' },
+  { value: 'pop', label: '气泡', desc: '短促轻提示，不打扰' },
+  { value: 'urgent', label: '紧急提醒', desc: '连续强提示，适合重要会话' },
+]
+
+export const SPEAK_MODES: { value: SpeakMode; label: string; desc: string }[] = [
+  { value: 'brief', label: '仅提示有新消息', desc: '例如：访客发来一条新消息' },
+  { value: 'summary', label: '名称 + 内容摘要', desc: '例如：访客说，请问什么时候发货' },
+]
+
+const STORAGE_KEY = 'kefu_notification_prefs_v2'
+const LEGACY_SOUND_KEY = 'kefu_notification_sound'
+const LEGACY_DESKTOP_KEY = 'kefu_notification_desktop'
+
+export const MAX_CUSTOM_SOUND_BYTES = 2 * 1024 * 1024
+export const MAX_CUSTOM_SOUND_SECONDS = 15
+
+function clamp(value: number, min: number, max: number): number {
+  return Math.min(max, Math.max(min, value))
+}
+
+function readLegacyBoolean(key: string, fallback: boolean): boolean {
+  try {
+    const raw = localStorage.getItem(key)
+    return raw == null ? fallback : raw === 'true'
+  } catch {
+    return fallback
+  }
+}
+
+function normalizePreset(value: unknown): SoundPresetId {
+  return SOUND_PRESETS.some(item => item.value === value) ? value as SoundPresetId : 'chime'
+}
+
+function normalizeCustomSound(value: unknown): CustomSoundMeta | null {
+  if (!value || typeof value !== 'object') return null
+  const raw = value as Partial<CustomSoundMeta>
+  if (typeof raw.id !== 'string' || !raw.id || typeof raw.name !== 'string' || !raw.name) return null
+  return {
+    id: raw.id,
+    name: raw.name.slice(0, 120),
+    mime: typeof raw.mime === 'string' ? raw.mime : '',
+    size: Number.isFinite(raw.size) ? Number(raw.size) : 0,
+    duration: Number.isFinite(raw.duration) ? Number(raw.duration) : 0,
+    savedAt: Number.isFinite(raw.savedAt) ? Number(raw.savedAt) : Date.now(),
+  }
+}
+
+export function defaultNotificationPreferences(): NotificationPreferences {
+  return {
+    version: 1,
+    soundEnabled: true,
+    desktopEnabled: true,
+    soundSource: 'preset',
+    preset: 'chime',
+    volume: 0.7,
+    customSound: null,
+    speakEnabled: false,
+    speakMode: 'brief',
+    speakRate: 1,
+    voiceURI: '',
+  }
+}
+
+export function loadNotificationPreferences(): NotificationPreferences {
+  const fallback = defaultNotificationPreferences()
+  fallback.soundEnabled = readLegacyBoolean(LEGACY_SOUND_KEY, fallback.soundEnabled)
+  fallback.desktopEnabled = readLegacyBoolean(LEGACY_DESKTOP_KEY, fallback.desktopEnabled)
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY)
+    if (!raw) return fallback
+    const saved = JSON.parse(raw) as Partial<NotificationPreferences>
+    const customSound = normalizeCustomSound(saved.customSound)
+    const soundSource: SoundSource = saved.soundSource === 'custom' && customSound ? 'custom' : 'preset'
+    return {
+      version: 1,
+      soundEnabled: typeof saved.soundEnabled === 'boolean' ? saved.soundEnabled : fallback.soundEnabled,
+      desktopEnabled: typeof saved.desktopEnabled === 'boolean' ? saved.desktopEnabled : fallback.desktopEnabled,
+      soundSource,
+      preset: normalizePreset(saved.preset),
+      volume: typeof saved.volume === 'number' ? clamp(saved.volume, 0, 1) : fallback.volume,
+      customSound,
+      speakEnabled: typeof saved.speakEnabled === 'boolean' ? saved.speakEnabled : fallback.speakEnabled,
+      speakMode: saved.speakMode === 'summary' ? 'summary' : 'brief',
+      speakRate: typeof saved.speakRate === 'number' ? clamp(saved.speakRate, 0.6, 1.6) : fallback.speakRate,
+      voiceURI: typeof saved.voiceURI === 'string' ? saved.voiceURI.slice(0, 300) : '',
+    }
+  } catch {
+    return fallback
+  }
+}
+
+export function saveNotificationPreferences(prefs: NotificationPreferences): void {
+  try {
+    const serialized = JSON.stringify(prefs)
+    if (localStorage.getItem(STORAGE_KEY) !== serialized) {
+      localStorage.setItem(STORAGE_KEY, serialized)
+    }
+    localStorage.setItem(LEGACY_SOUND_KEY, String(prefs.soundEnabled))
+    localStorage.setItem(LEGACY_DESKTOP_KEY, String(prefs.desktopEnabled))
+  } catch {
+    // localStorage may be unavailable in private browsing / restricted contexts.
+  }
+}
+
+export function notificationPreferencesStorageKey(): string {
+  return STORAGE_KEY
+}
diff --git a/web/src/pages/agent/settings/NotifySection.tsx b/web/src/pages/agent/settings/NotifySection.tsx
index def8cbe..b22d11b 100644
--- a/web/src/pages/agent/settings/NotifySection.tsx
+++ b/web/src/pages/agent/settings/NotifySection.tsx
@@ -1,5 +1,6 @@
 import { Button, Form, Spin, Switch } from 'antd'
 import type { FormInstance } from 'antd'
+import NotificationPreferences from '@/components/common/NotificationPreferences'
 import type { SaveSettingsFn } from './types'
 
 interface NotifySectionProps {
@@ -12,7 +13,8 @@ interface NotifySectionProps {
 /** 通知设置：新会话、留言与日报偏好 */
 const NotifySection = ({ notifyForm, loading, saving, onSave }: NotifySectionProps) => {
   return (
-    <div className="bg-white rounded-2xl border border-slate-200/80 shadow-xs p-6 md:p-8">
+    <>
+      <div className="bg-white rounded-2xl border border-slate-200/80 shadow-xs p-6 md:p-8">
       {loading ? (
         <div className="py-16 text-center"><Spin /></div>
       ) : (
@@ -32,7 +34,7 @@ const NotifySection = ({ notifyForm, loading, saving, onSave }: NotifySectionPro
 
           <div className="space-y-3 mb-6">
             {[
-              { name: 'notify_new_session', title: '新会话提醒', desc: '有新访客进线时提醒；浏览器通知与声音可在工作台铃铛中配置' },
+              { name: 'notify_new_session', title: '新会话提醒', desc: '有新访客进线时提醒；声音、朗读与浏览器通知可在下方本机设置中调整' },
               { name: 'notify_offline_leave', title: '离线留言通知', desc: '访客在离线时段提交留言时发送系统提醒' },
               { name: 'notify_daily_report', title: '服务日报推送', desc: '每日定时汇总推送坐席接待与满意度数据摘要' },
             ].map(item => (
@@ -63,7 +65,12 @@ const NotifySection = ({ notifyForm, loading, saving, onSave }: NotifySectionPro
           </div>
         </Form>
       )}
-    </div>
+      </div>
+
+      <div className="mt-5">
+        <NotificationPreferences />
+      </div>
+    </>
   )
 }
 
diff --git a/web/src/pages/agent/settings/tabs.tsx b/web/src/pages/agent/settings/tabs.tsx
index 500a4fc..f18a695 100644
--- a/web/src/pages/agent/settings/tabs.tsx
+++ b/web/src/pages/agent/settings/tabs.tsx
@@ -38,7 +38,7 @@ export const tabGroups: TabGroup[] = [
     groupName: '自动化与通知',
     items: [
       { key: 'autoreply', label: '自动回复', desc: '多段欢迎语（含图片）与离线留言提示', icon: <MessageOutlined /> },
-      { key: 'notify', label: '通知设置', desc: '新会话、留言与日报偏好', icon: <BellOutlined /> },
+      { key: 'notify', label: '通知设置', desc: '声音、朗读、新会话与留言提醒', icon: <BellOutlined /> },
     ],
   },
 ]
diff --git a/web/src/stores/notifications.tsx b/web/src/stores/notifications.tsx
index 5f9ea92..aba5b49 100644
--- a/web/src/stores/notifications.tsx
+++ b/web/src/stores/notifications.tsx
@@ -1,9 +1,38 @@
 import { createContext, useCallback, useContext, useEffect, useMemo, useRef, useState, type ReactNode } from 'react'
 import { useAuth } from './auth'
+import {
+  MAX_CUSTOM_SOUND_BYTES,
+  MAX_CUSTOM_SOUND_SECONDS,
+  loadNotificationPreferences,
+  notificationPreferencesStorageKey,
+  saveNotificationPreferences,
+  type CustomSoundMeta,
+  type NotificationPreferences,
+  type SoundPresetId,
+  type SoundSource,
+  type SpeakMode,
+} from '@/lib/notificationSettings'
+import {
+  cancelSpeech,
+  clearCustomSound,
+  decodeAudioBlob,
+  isSpeechSupported,
+  isSupportedAudioFile,
+  listSpeechVoices,
+  loadCustomSound,
+  playAudioBuffer,
+  playPresetSound,
+  readAudioDuration,
+  saveCustomSound,
+  speakText,
+} from '@/lib/notificationAudio'
 
-const SOUND_KEY = 'kefu_notification_sound'
-const DESKTOP_KEY = 'kefu_notification_desktop'
 const OPEN_SESSION_EVENT = 'kefu-open-session'
+const LEADER_KEY = 'kefu_notification_leader_v1'
+const LEADER_LEASE_MS = 12_000
+const LEADER_HEARTBEAT_MS = 4_000
+const NOTIFICATION_THROTTLE_MS = 2_000
+const SPEECH_SUMMARY_CHARS = 36
 
 interface IncomingMessage {
   id?: number | string
@@ -14,27 +43,40 @@ interface IncomingMessage {
   visitor_name?: string
 }
 
-interface NotificationState {
+export interface NotificationState {
+  prefs: NotificationPreferences
   soundEnabled: boolean
   desktopEnabled: boolean
   permission: NotificationPermission | 'unsupported'
+  preset: SoundPresetId
+  soundSource: SoundSource
+  customSound: CustomSoundMeta | null
+  volume: number
+  speakEnabled: boolean
+  speakMode: SpeakMode
+  speakRate: number
+  voiceURI: string
+  voices: SpeechSynthesisVoice[]
+  ttsSupported: boolean
   setSoundEnabled: (enabled: boolean) => void
   setDesktopEnabled: (enabled: boolean) => void
+  setPreset: (preset: SoundPresetId) => void
+  setSoundSource: (source: SoundSource) => void
+  setVolume: (volume: number) => void
+  setSpeakEnabled: (enabled: boolean) => void
+  setSpeakMode: (mode: SpeakMode) => void
+  setSpeakRate: (rate: number) => void
+  setVoiceURI: (voiceURI: string) => void
+  uploadCustomSound: (file: File) => Promise<void>
+  removeCustomSound: () => Promise<void>
+  previewSound: () => Promise<void>
+  previewSpeech: () => boolean
   requestDesktopPermission: () => Promise<boolean>
   setActiveSessionId: (id: number | null) => void
 }
 
 const NotificationContext = createContext<NotificationState | null>(null)
 
-function readBoolean(key: string, fallback: boolean): boolean {
-  try {
-    const value = localStorage.getItem(key)
-    return value == null ? fallback : value === 'true'
-  } catch {
-    return fallback
-  }
-}
-
 function messagePreview(message: IncomingMessage): string {
   if (message.type === 'image') return '[图片]'
   const content = String(message.content || '').replace(/\s+/g, ' ').trim()
@@ -52,55 +94,229 @@ function getPermission(): NotificationPermission | 'unsupported' {
     : 'unsupported'
 }
 
+function clamp(value: number, min: number, max: number): number {
+  return Math.min(max, Math.max(min, value))
+}
+
+function newTabId(): string {
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID()
+  }
+  return `${Date.now()}-${Math.random().toString(36).slice(2)}`
+}
+
+function speechText(message: IncomingMessage, mode: SpeakMode): string {
+  const name = displayName(message)
+  if (message.type === 'image') return `${name}发来一张图片`
+  const raw = String(message.content || '')
+    .replace(/https?:\/\/\S+/gi, '链接')
+    .replace(/[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}/gi, '邮箱')
+    .replace(/(?:\+?86[- ]?)?1[3-9]\d{9}/g, '手机号')
+    .replace(/\s+/g, ' ')
+    .trim()
+  if (!raw) return `${name}发来一条新消息`
+  if (mode === 'brief') return `${name}发来一条新消息`
+  return `${name}说，${raw.slice(0, SPEECH_SUMMARY_CHARS)}`
+}
+
 export function AgentNotificationProvider({ children }: { children: ReactNode }) {
   const { user } = useAuth()
-  const [soundEnabled, setSoundEnabledState] = useState(() => readBoolean(SOUND_KEY, true))
-  const [desktopEnabled, setDesktopEnabledState] = useState(() => readBoolean(DESKTOP_KEY, true))
+  const [prefs, setPrefsState] = useState<NotificationPreferences>(() => loadNotificationPreferences())
+  const prefsRef = useRef(prefs)
   const [permission, setPermission] = useState<NotificationPermission | 'unsupported'>(getPermission)
+  const permissionRef = useRef(permission)
+  const [voices, setVoices] = useState<SpeechSynthesisVoice[]>(() => listSpeechVoices())
+  const [ttsSupported] = useState(() => isSpeechSupported())
   const activeSessionIdRef = useRef<number | null>(null)
   const audioContextRef = useRef<AudioContext | null>(null)
+  const activeSourcesRef = useRef<AudioScheduledSourceNode[]>([])
+  const customBufferRef = useRef<{ id: string; buffer: AudioBuffer } | null>(null)
   const seenMessageIdsRef = useRef<Set<number>>(new Set())
+  const leaderRef = useRef(false)
+  const lastNotifiedAtRef = useRef(0)
 
-  const setSoundEnabled = useCallback((enabled: boolean) => {
-    setSoundEnabledState(enabled)
-    try { localStorage.setItem(SOUND_KEY, String(enabled)) } catch { /* storage unavailable */ }
+  useEffect(() => {
+    prefsRef.current = prefs
+    saveNotificationPreferences(prefs)
+  }, [prefs])
+
+  useEffect(() => {
+    permissionRef.current = permission
+  }, [permission])
+
+  const updatePrefs = useCallback((patch: Partial<NotificationPreferences>) => {
+    const next = { ...prefsRef.current, ...patch }
+    prefsRef.current = next
+    setPrefsState(next)
   }, [])
 
-  const setDesktopEnabled = useCallback((enabled: boolean) => {
-    setDesktopEnabledState(enabled)
-    try { localStorage.setItem(DESKTOP_KEY, String(enabled)) } catch { /* storage unavailable */ }
-  }, [])
-
-  const ensureAudioContext = useCallback(() => {
-    if (!soundEnabled || typeof window === 'undefined') return null
-    const AudioContextCtor = window.AudioContext || (window as typeof window & { webkitAudioContext?: typeof AudioContext }).webkitAudioContext
+  const ensureAudioContext = useCallback((): AudioContext | null => {
+    if (typeof window === 'undefined') return null
+    const AudioContextCtor = window.AudioContext
+      || (window as typeof window & { webkitAudioContext?: typeof AudioContext }).webkitAudioContext
     if (!AudioContextCtor) return null
     if (!audioContextRef.current) audioContextRef.current = new AudioContextCtor()
-    return audioContextRef.current
-  }, [soundEnabled])
+    const context = audioContextRef.current
+    if (context.state === 'suspended') void context.resume()
+    return context
+  }, [])
+
+  const stopActiveSources = useCallback(() => {
+    for (const source of activeSourcesRef.current) {
+      try { source.stop() } catch { /* already stopped */ }
+    }
+    activeSourcesRef.current = []
+  }, [])
+
+  const loadCustomBuffer = useCallback(async (): Promise<AudioBuffer | null> => {
+    const meta = prefsRef.current.customSound
+    if (!meta) return null
+    if (customBufferRef.current?.id === meta.id) return customBufferRef.current.buffer
+    const context = ensureAudioContext()
+    if (!context) return null
+    try {
+      const stored = await loadCustomSound()
+      if (!stored || stored.meta.id !== meta.id) return null
+      const buffer = await decodeAudioBlob(context, stored.blob)
+      customBufferRef.current = { id: meta.id, buffer }
+      return buffer
+    } catch {
+      return null
+    }
+  }, [ensureAudioContext])
+
+  const playSoundInternal = useCallback(async (force: boolean) => {
+    const current = prefsRef.current
+    if (!force && !current.soundEnabled) return
+    const context = ensureAudioContext()
+    if (!context) return
+    try { await context.resume() } catch { /* browser may require a gesture */ }
+    if (context.state !== 'running') return
+    stopActiveSources()
+
+    if (current.soundSource === 'custom' && current.customSound) {
+      const buffer = await loadCustomBuffer()
+      if (buffer) {
+        const source = playAudioBuffer(context, buffer, current.volume)
+        activeSourcesRef.current = [source]
+        source.onended = () => {
+          activeSourcesRef.current = activeSourcesRef.current.filter(item => item !== source)
+        }
+        return
+      }
+    }
+
+    activeSourcesRef.current = playPresetSound(context, current.preset, current.volume)
+  }, [ensureAudioContext, loadCustomBuffer, stopActiveSources])
+
+  const speakWithCurrentPrefs = useCallback((text: string) => {
+    const current = prefsRef.current
+    return speakText(text, {
+      voiceURI: current.voiceURI,
+      rate: current.speakRate,
+      volume: current.volume,
+    })
+  }, [])
+
+  const speakIncoming = useCallback((message: IncomingMessage) => {
+    if (!prefsRef.current.speakEnabled) return false
+    return speakWithCurrentPrefs(speechText(message, prefsRef.current.speakMode))
+  }, [speakWithCurrentPrefs])
 
   const unlockAudio = useCallback(() => {
     const context = ensureAudioContext()
     if (context?.state === 'suspended') void context.resume()
   }, [ensureAudioContext])
 
-  const playSound = useCallback(() => {
+  const setSoundEnabled = useCallback((enabled: boolean) => {
+    updatePrefs({ soundEnabled: enabled })
+    if (enabled) unlockAudio()
+  }, [unlockAudio, updatePrefs])
+
+  const setDesktopEnabled = useCallback((enabled: boolean) => {
+    updatePrefs({ desktopEnabled: enabled })
+  }, [updatePrefs])
+
+  const setPreset = useCallback((preset: SoundPresetId) => {
+    updatePrefs({ preset, soundSource: 'preset' })
+  }, [updatePrefs])
+
+  const setSoundSource = useCallback((source: SoundSource) => {
+    if (source === 'custom' && !prefsRef.current.customSound) return
+    updatePrefs({ soundSource: source })
+  }, [updatePrefs])
+
+  const setVolume = useCallback((volume: number) => {
+    updatePrefs({ volume: clamp(volume, 0, 1) })
+  }, [updatePrefs])
+
+  const setSpeakEnabled = useCallback((enabled: boolean) => {
+    updatePrefs({ speakEnabled: enabled })
+    if (enabled) unlockAudio()
+    else cancelSpeech()
+  }, [unlockAudio, updatePrefs])
+
+  const setSpeakMode = useCallback((speakMode: SpeakMode) => {
+    updatePrefs({ speakMode })
+  }, [updatePrefs])
+
+  const setSpeakRate = useCallback((speakRate: number) => {
+    updatePrefs({ speakRate: clamp(speakRate, 0.6, 1.6) })
+  }, [updatePrefs])
+
+  const setVoiceURI = useCallback((voiceURI: string) => {
+    updatePrefs({ voiceURI })
+  }, [updatePrefs])
+
+  const uploadCustomSound = useCallback(async (file: File) => {
+    if (!isSupportedAudioFile(file)) {
+      throw new Error('仅支持 mp3、wav、ogg、m4a、aac 音频')
+    }
+    if (file.size > MAX_CUSTOM_SOUND_BYTES) {
+      throw new Error('音频文件不能超过 2MB')
+    }
     const context = ensureAudioContext()
-    if (!context) return
-    const start = context.currentTime
-    const oscillator = context.createOscillator()
-    const gain = context.createGain()
-    oscillator.type = 'sine'
-    oscillator.frequency.setValueAtTime(880, start)
-    oscillator.frequency.setValueAtTime(660, start + 0.11)
-    gain.gain.setValueAtTime(0.0001, start)
-    gain.gain.exponentialRampToValueAtTime(0.12, start + 0.015)
-    gain.gain.exponentialRampToValueAtTime(0.0001, start + 0.24)
-    oscillator.connect(gain)
-    gain.connect(context.destination)
-    oscillator.start(start)
-    oscillator.stop(start + 0.25)
-  }, [ensureAudioContext])
+    let buffer: AudioBuffer | null = null
+    let duration = 0
+    if (context) {
+      try {
+        buffer = await decodeAudioBlob(context, file)
+        duration = buffer.duration
+      } catch {
+        throw new Error('无法解析该音频文件，请换一个 mp3 / wav 文件')
+      }
+    } else {
+      duration = await readAudioDuration(file)
+    }
+    if (duration > MAX_CUSTOM_SOUND_SECONDS) {
+      throw new Error(`提示音不能超过 ${MAX_CUSTOM_SOUND_SECONDS} 秒`)
+    }
+    const meta: CustomSoundMeta = {
+      id: `custom-${Date.now()}`,
+      name: file.name.slice(0, 120),
+      mime: file.type,
+      size: file.size,
+      duration,
+      savedAt: Date.now(),
+    }
+    await saveCustomSound(file, meta)
+    customBufferRef.current = buffer ? { id: meta.id, buffer } : null
+    updatePrefs({ customSound: meta, soundSource: 'custom' })
+  }, [ensureAudioContext, updatePrefs])
+
+  const removeCustomSound = useCallback(async () => {
+    await clearCustomSound()
+    customBufferRef.current = null
+    updatePrefs({ customSound: null, soundSource: 'preset' })
+  }, [updatePrefs])
+
+  const previewSound = useCallback(async () => {
+    await playSoundInternal(true)
+  }, [playSoundInternal])
+
+  const previewSpeech = useCallback(() => {
+    return speakWithCurrentPrefs('您好，这是客服云的声音提醒试听。')
+  }, [speakWithCurrentPrefs])
 
   useEffect(() => {
     window.addEventListener('pointerdown', unlockAudio)
@@ -111,9 +327,101 @@ export function AgentNotificationProvider({ children }: { children: ReactNode })
     }
   }, [unlockAudio])
 
-  useEffect(() => () => {
-    void audioContextRef.current?.close()
-    audioContextRef.current = null
+  useEffect(() => {
+    if (!ttsSupported) return
+    const refreshVoices = () => setVoices(listSpeechVoices())
+    refreshVoices()
+    const synth = window.speechSynthesis
+    synth.addEventListener?.('voiceschanged', refreshVoices)
+    return () => {
+      synth.removeEventListener?.('voiceschanged', refreshVoices)
+      cancelSpeech()
+    }
+  }, [ttsSupported])
+
+  useEffect(() => {
+    const refreshPermission = () => setPermission(getPermission())
+    const onVisibilityChange = () => {
+      if (document.visibilityState === 'visible') refreshPermission()
+    }
+    window.addEventListener('focus', refreshPermission)
+    document.addEventListener('visibilitychange', onVisibilityChange)
+    return () => {
+      window.removeEventListener('focus', refreshPermission)
+      document.removeEventListener('visibilitychange', onVisibilityChange)
+    }
+  }, [])
+
+  // Keep settings in sync when another tab changes them.
+  useEffect(() => {
+    const onStorage = (event: StorageEvent) => {
+      if (event.key !== notificationPreferencesStorageKey()) return
+      const next = loadNotificationPreferences()
+      prefsRef.current = next
+      setPrefsState(next)
+    }
+    window.addEventListener('storage', onStorage)
+    return () => window.removeEventListener('storage', onStorage)
+  }, [])
+
+  // Only one tab should play sound / speak / show desktop notifications.
+  useEffect(() => {
+    let active = true
+    let releaseLock: (() => void) | null = null
+    if (typeof navigator !== 'undefined' && 'locks' in navigator) {
+      const controller = new AbortController()
+      void navigator.locks.request('kefu-notification-leader', { signal: controller.signal }, async () => {
+        leaderRef.current = true
+        await new Promise<void>(resolve => { releaseLock = resolve })
+        leaderRef.current = false
+      }).catch(() => {
+        // If Web Locks is unavailable despite the feature check, keep notifications working.
+        if (active) leaderRef.current = true
+      })
+      return () => {
+        active = false
+        controller.abort()
+        releaseLock?.()
+        releaseLock = null
+        leaderRef.current = false
+      }
+    }
+
+    const tabId = newTabId()
+    const readLeader = (): { id: string; expiresAt: number } | null => {
+      try {
+        const raw = localStorage.getItem(LEADER_KEY)
+        if (!raw) return null
+        const parsed = JSON.parse(raw) as { id?: string; expiresAt?: number }
+        if (!parsed.id || typeof parsed.expiresAt !== 'number') return null
+        return { id: parsed.id, expiresAt: parsed.expiresAt }
+      } catch {
+        return null
+      }
+    }
+    const claim = () => {
+      try {
+        const now = Date.now()
+        const current = readLeader()
+        if (!current || current.id === tabId || current.expiresAt <= now) {
+          localStorage.setItem(LEADER_KEY, JSON.stringify({ id: tabId, expiresAt: now + LEADER_LEASE_MS }))
+          leaderRef.current = true
+          return
+        }
+        leaderRef.current = current.id === tabId
+      } catch {
+        // Without localStorage every tab has to behave as a single tab.
+        leaderRef.current = true
+      }
+    }
+    claim()
+    const timer = window.setInterval(claim, LEADER_HEARTBEAT_MS)
+    return () => {
+      window.clearInterval(timer)
+      try {
+        if (readLeader()?.id === tabId) localStorage.removeItem(LEADER_KEY)
+      } catch { /* ignore */ }
+    }
   }, [])
 
   const requestDesktopPermission = useCallback(async () => {
@@ -148,12 +456,25 @@ export function AgentNotificationProvider({ children }: { children: ReactNode })
     }
 
     const showNotification = (message: IncomingMessage, sessionId: number) => {
-      const body = `${displayName(message)}：${messagePreview(message)}`
-      if (soundEnabled) playSound()
-      if (!desktopEnabled || permission !== 'granted') return
+      if (!leaderRef.current) return
+      if (activeSessionIdRef.current === sessionId && document.visibilityState === 'visible') return
+      const now = Date.now()
+      if (now - lastNotifiedAtRef.current < NOTIFICATION_THROTTLE_MS) return
+      lastNotifiedAtRef.current = now
+
+      const current = prefsRef.current
+      if (current.soundEnabled) void playSoundInternal(false)
+      if (current.speakEnabled) {
+        window.setTimeout(() => {
+          if (prefsRef.current.speakEnabled) speakIncoming(message)
+        }, 180)
+      }
+      if (!current.desktopEnabled || permissionRef.current !== 'granted') return
+
       const notification = new window.Notification('客服云：新消息', {
-        body,
+        body: `${displayName(message)}：${messagePreview(message)}`,
         tag: `kefu-session-${sessionId}`,
+        silent: current.soundEnabled || current.speakEnabled,
       })
       notification.onclick = () => {
         window.focus()
@@ -181,7 +502,6 @@ export function AgentNotificationProvider({ children }: { children: ReactNode })
             const first = seenMessageIdsRef.current.values().next().value
             if (typeof first === 'number') seenMessageIdsRef.current.delete(first)
           }
-          if (activeSessionIdRef.current === sessionId && document.visibilityState === 'visible') return
           showNotification(payload.data, sessionId)
         } catch {
           // Ignore malformed WebSocket frames.
@@ -207,17 +527,66 @@ export function AgentNotificationProvider({ children }: { children: ReactNode })
         activeSocket = null
       }
     }
-  }, [desktopEnabled, permission, playSound, soundEnabled, user?.token])
+  }, [playSoundInternal, speakIncoming, user?.token])
+
+  useEffect(() => () => {
+    cancelSpeech()
+    stopActiveSources()
+    void audioContextRef.current?.close()
+    audioContextRef.current = null
+  }, [stopActiveSources])
 
   const value = useMemo(() => ({
-    soundEnabled,
-    desktopEnabled,
+    prefs,
+    soundEnabled: prefs.soundEnabled,
+    desktopEnabled: prefs.desktopEnabled,
     permission,
+    preset: prefs.preset,
+    soundSource: prefs.soundSource,
+    customSound: prefs.customSound,
+    volume: prefs.volume,
+    speakEnabled: prefs.speakEnabled,
+    speakMode: prefs.speakMode,
+    speakRate: prefs.speakRate,
+    voiceURI: prefs.voiceURI,
+    voices,
+    ttsSupported,
     setSoundEnabled,
     setDesktopEnabled,
+    setPreset,
+    setSoundSource,
+    setVolume,
+    setSpeakEnabled,
+    setSpeakMode,
+    setSpeakRate,
+    setVoiceURI,
+    uploadCustomSound,
+    removeCustomSound,
+    previewSound,
+    previewSpeech,
     requestDesktopPermission,
     setActiveSessionId,
-  }), [desktopEnabled, permission, requestDesktopPermission, setActiveSessionId, setDesktopEnabled, setSoundEnabled, soundEnabled])
+  }), [
+    permission,
+    prefs,
+    previewSound,
+    previewSpeech,
+    removeCustomSound,
+    requestDesktopPermission,
+    setActiveSessionId,
+    setDesktopEnabled,
+    setPreset,
+    setSoundEnabled,
+    setSoundSource,
+    setSpeakEnabled,
+    setSpeakMode,
+    setSpeakRate,
+    setVoiceURI,
+    setVolume,
+    ttsSupported,
+    uploadCustomSound,
+    voices,
+  ])
 
   return <NotificationContext.Provider value={value}>{children}</NotificationContext.Provider>
 }