diff --git a/server/baiduAsrProxy.ts b/server/baiduAsrProxy.ts
index 0bcf088..f0fb761 100644
--- a/server/baiduAsrProxy.ts
+++ b/server/baiduAsrProxy.ts
@@ -198,10 +198,15 @@ export const createBaiduAsrMiddleware = () => async (
 
   try {
     const audio = await readAudioBody(req);
+    const requestStartedAt = Date.now();
+    const audioDurationMs = Math.round(audio.length / 2 / 16_000 * 1000);
+    console.info(`[Baidu ASR] start bytes=${audio.length} durationMs=${audioDurationMs}`);
     const text = await recognizeAudio(audio);
+    console.info(`[Baidu ASR] success durationMs=${audioDurationMs} elapsedMs=${Date.now() - requestStartedAt}`);
     sendJson(res, 200, {text});
   } catch (error) {
     if (error instanceof HttpError) {
+      console.warn(`[Baidu ASR] failed status=${error.statusCode} message=${error.message}`);
       sendJson(res, error.statusCode, {error: error.message});
       return;
     }
diff --git a/src/App.vue b/src/App.vue
index f656119..7a5f02c 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -2,7 +2,15 @@
     <main class="realtime-dh-wrapper">
         <section class="realtime-dh-stage" @pointerdown.capture.once="unlockAudioAndPlay">
             <div class="visual-stage">
-                <div class="standby-scene" :class="{thinking: waitingForAnswer}">
+                <div
+                    class="standby-scene"
+                    :class="{
+                        thinking: waitingForAnswer,
+                        ready: standbyVisualReady,
+                        'human-mounted': showHuman,
+                        'human-active': humanVisualReady
+                    }"
+                >
                     <video
                         v-for="videoIndex in 2"
                         :key="videoIndex"
@@ -19,6 +27,7 @@
                         playsinline
                         preload="auto"
                         disablepictureinpicture
+                        @loadeddata="handleStandbyLoaded(videoIndex - 1)"
                         @timeupdate="handleStandbyProgress(videoIndex - 1)"
                         @ended="handleStandbyEnded(videoIndex - 1)"
                     />
@@ -104,6 +113,8 @@
                 ref="voiceRenderRef"
                 :speech-busy="speechBusy"
                 :playback-pending="playbackPending"
+                @speech-detected="handleSpeechDetected"
+                @speech-aborted="handleSpeechAborted"
                 @question-updated="handleQuestionUpdated"
                 @question-recognized="handleQuestionRecognized"
                 @answer-ready="handleAnswerReady"
@@ -131,9 +142,10 @@ import {checkPlayUnMute} from './utils/audioUtils';
 
 const ReadyState = {UNINSTANTIATED: -1, CONNECTING: 0, OPEN: 1, CLOSING: 2, CLOSED: 3};
 const TOOLBAR_HIDE_DELAY_MS = 3_000;
-const POST_SPEECH_DISCONNECT_DELAY_MS = 10_000;
-const HUMAN_SCENE_FADE_OUT_MS = 920;
-const STANDBY_CROSSFADE_MS = 650;
+const HUMAN_SCENE_FADE_OUT_MS = 80;
+const HUMAN_SCENE_REVEAL_DELAY_MS = 650;
+const STANDBY_CROSSFADE_MS = 760;
+const AUDIO_RESTORE_DELAYS_MS = [0, 180, 600, 1_200];
 const dhIframe = new DHIframe('digital-human-iframe');
 const realTimeVideoReady = ref(false);
 const humanVisualReady = ref(false);
@@ -157,18 +169,20 @@ const voiceRenderRef = ref(null);
 const recognizedQuestion = ref('');
 const deepSeekAnswer = ref('');
 const waitingForAnswer = ref(false);
+const standbyVisualReady = ref(false);
 const standbyActiveVideo = ref(0);
 const standbyIncomingVideo = ref(-1);
 const standbyVideos = [null, null];
 let connectionGeneration = 0;
 let toolbarHideTimer = 0;
-let postSpeechDisconnectTimer = 0;
 let humanVisualTimer = 0;
 let humanReleaseTimer = 0;
 let standbyCrossfadeTimer = 0;
 let standbyCrossfadeRunning = false;
+let audioRestoreTimers = [];
+let videoPlaybackStartedGeneration = -1;
 
-const humanReady = computed(() => realTimeVideoReady.value && humanVisualReady.value && wsConnected.value && showHuman.value);
+const humanReady = computed(() => realTimeVideoReady.value && wsConnected.value && showHuman.value);
 const connectionState = computed(() => !showHuman.value ? 'disconnected' : (humanReady.value ? 'connected' : 'connecting'));
 const connectionLabel = computed(() => ({
     disconnected: '已断开 · 不计费', connecting: '连接中', connected: '已连接'
@@ -178,6 +192,9 @@ const playbackPending = computed(() => Boolean(pendingSpeechText.value) || playb
 const setStandbyVideoRef = (element, index) => {
     standbyVideos[index] = element;
 };
+const handleStandbyLoaded = (index) => {
+    if (index === standbyActiveVideo.value) standbyVisualReady.value = true;
+};
 const finishStandbyCrossfade = (outgoingIndex, incomingIndex) => {
     const outgoing = standbyVideos[outgoingIndex];
     standbyActiveVideo.value = incomingIndex;
@@ -244,6 +261,52 @@ const showToolbar = () => {
     toolbarVisible.value = true;
     scheduleToolbarHide();
 };
+const syncAudioUnlockFromBrowser = () => {
+    if (soundEnabled.value && navigator.userActivation?.hasBeenActive) {
+        audioUnlocked.value = true;
+        soundUnlockTip.value = false;
+    }
+};
+const clearAudioRestoreTimers = () => {
+    audioRestoreTimers.forEach(timer => window.clearTimeout(timer));
+    audioRestoreTimers = [];
+};
+const startVideoPlaybackOnce = () => {
+    if (!showHuman.value || !realTimeVideoReady.value || !wsConnected.value
+        || !soundEnabled.value || !audioUnlocked.value
+        || videoPlaybackStartedGeneration === connectionGeneration) return;
+    dhIframe.playVideo(true);
+    videoPlaybackStartedGeneration = connectionGeneration;
+};
+const scheduleAudioRestore = () => {
+    clearAudioRestoreTimers();
+    if (!showHuman.value || !soundEnabled.value || !audioUnlocked.value) return;
+    startVideoPlaybackOnce();
+    const generation = connectionGeneration;
+    audioRestoreTimers = AUDIO_RESTORE_DELAYS_MS.map(delay => window.setTimeout(() => {
+        if (generation !== connectionGeneration || !showHuman.value
+            || !soundEnabled.value || !audioUnlocked.value) return;
+        dhIframe.muteAudio(false);
+        // 官方事件只会上报初始静音，不会上报解除静音；命令发出后以会话状态为准。
+        videoIsMuted.value = false;
+        if (delay === AUDIO_RESTORE_DELAYS_MS.at(-1)) void tryPlayPendingAnswer();
+    }, delay));
+};
+const scheduleHumanReveal = (delay = HUMAN_SCENE_REVEAL_DELAY_MS) => {
+    if (humanVisualTimer) {
+        window.clearTimeout(humanVisualTimer);
+        humanVisualTimer = 0;
+    }
+    if (!showHuman.value || !realTimeVideoReady.value || !wsConnected.value) return;
+    const generation = connectionGeneration;
+    humanVisualTimer = window.setTimeout(() => {
+        humanVisualTimer = 0;
+        if (generation === connectionGeneration && showHuman.value
+            && realTimeVideoReady.value && wsConnected.value) {
+            humanVisualReady.value = true;
+        }
+    }, delay);
+};
 const cancelHumanRelease = () => {
     if (humanReleaseTimer) {
         window.clearTimeout(humanReleaseTimer);
@@ -251,6 +314,8 @@ const cancelHumanRelease = () => {
     }
 };
 const resetConnectionState = () => {
+    clearAudioRestoreTimers();
+    videoPlaybackStartedGeneration = -1;
     if (humanVisualTimer) {
         window.clearTimeout(humanVisualTimer);
         humanVisualTimer = 0;
@@ -263,8 +328,9 @@ const resetConnectionState = () => {
     activeSpeechRequestId.value = '';
     videoIsMuted.value = true;
 };
-const connectHuman = () => {
-    if (showHuman.value || !pendingSpeechText.value) return;
+const connectHuman = (allowWithoutAnswer = false) => {
+    if (showHuman.value || (!pendingSpeechText.value && !allowWithoutAnswer)) return;
+    syncAudioUnlockFromBrowser();
     cancelHumanRelease();
     connectionGeneration += 1;
     resetConnectionState();
@@ -282,10 +348,6 @@ const finalizeHumanRelease = (preservePendingAnswer = false) => {
     showToolbar();
 };
 const releaseHuman = (preservePendingAnswer = false, smooth = false) => {
-    if (postSpeechDisconnectTimer) {
-        window.clearTimeout(postSpeechDisconnectTimer);
-        postSpeechDisconnectTimer = 0;
-    }
     cancelHumanRelease();
     if (smooth && showHuman.value && humanVisualReady.value) {
         humanVisualReady.value = false;
@@ -302,23 +364,20 @@ const disconnectHuman = () => {
     releaseHuman(false, true);
 };
 const sendSpeech = (text) => {
-    if (postSpeechDisconnectTimer) {
-        window.clearTimeout(postSpeechDisconnectTimer);
-        postSpeechDisconnectTimer = 0;
-    }
     cancelHumanRelease();
     const requestId = uuidV4();
     activeSpeechRequestId.value = requestId;
     currentSpeechText.value = text;
     speechBusy.value = true;
     dhIframe.sendMessage({action: 'TEXT_RENDER', body: text, requestId});
+    scheduleAudioRestore();
 };
 const tryPlayPendingAnswer = async () => {
     if (!pendingSpeechText.value || !humanReady.value || playbackPreparing.value || speechBusy.value) return;
     playbackPreparing.value = true;
     const generation = connectionGeneration;
     try {
-        if (soundEnabled.value && videoIsMuted.value) {
+        if (soundEnabled.value) {
             const canPlayWithSound = audioUnlocked.value || await checkPlayUnMute();
             if (generation !== connectionGeneration || !humanReady.value) return;
             if (!canPlayWithSound) {
@@ -330,10 +389,8 @@ const tryPlayPendingAnswer = async () => {
                 return;
             }
             audioUnlocked.value = true;
-            dhIframe.playVideo(true);
-            dhIframe.muteAudio(false);
-            videoIsMuted.value = false;
-            await new Promise(resolve => window.setTimeout(resolve, 240));
+            scheduleAudioRestore();
+            await new Promise(resolve => window.setTimeout(resolve, 140));
         } else if (!soundEnabled.value && !videoIsMuted.value) {
             dhIframe.muteAudio(true);
             videoIsMuted.value = true;
@@ -355,17 +412,25 @@ const handleAnswerReady = async (text) => {
     if (!showHuman.value) connectHuman();
     else {
         cancelHumanRelease();
-        if (realTimeVideoReady.value) humanVisualReady.value = true;
         void tryPlayPendingAnswer();
     }
 };
 const handleQuestionUpdated = (text) => {
     recognizedQuestion.value = text;
 };
+const handleSpeechDetected = () => {
+    cancelHumanRelease();
+    // 录音期间不启动数字人 WebRTC。部分安卓浏览器在第二轮重连 WebRTC 时
+    // 会切换系统音频路由，导致正在录制的麦克风数据异常并触发百度识别超时。
+    // 等 DeepSeek 返回答案后再由 handleAnswerReady 建立连接，不改变画面过渡效果。
+};
+// 识别失败时保持现有连接，继续等待下一次语音输入。
+const handleSpeechAborted = () => {};
 const handleQuestionRecognized = (text) => {
     recognizedQuestion.value = text;
     deepSeekAnswer.value = '';
     waitingForAnswer.value = true;
+    cancelHumanRelease();
 };
 const handleDeepSeekTimeout = () => {
     waitingForAnswer.value = false;
@@ -389,9 +454,7 @@ const unlockAudioAndPlay = () => {
     audioUnlocked.value = true;
     soundUnlockTip.value = false;
     if (showHuman.value) {
-        dhIframe.playVideo(true);
-        dhIframe.muteAudio(false);
-        videoIsMuted.value = false;
+        scheduleAudioRestore();
         window.setTimeout(() => void tryPlayPendingAnswer(), 120);
     } else if (pendingSpeechText.value) {
         connectHuman();
@@ -402,9 +465,7 @@ const enableSound = () => {
     audioUnlocked.value = true;
     soundUnlockTip.value = false;
     if (showHuman.value) {
-        dhIframe.playVideo(true);
-        dhIframe.muteAudio(false);
-        videoIsMuted.value = false;
+        scheduleAudioRestore();
         window.setTimeout(() => void tryPlayPendingAnswer(), 120);
     } else if (pendingSpeechText.value) {
         connectHuman();
@@ -421,18 +482,32 @@ const onMessage = (event) => {
     const {type, content = {}} = event.data;
     if (type === 'rtcState') {
         if (content.action === 'remoteVideoConnected') {
+            // 这里只表示已获取流，画面可能仍处于白色初始化帧。
+            return;
+        }
+        if (content.action === 'remotevideoon') {
             realTimeVideoReady.value = true;
-            if (humanVisualTimer) window.clearTimeout(humanVisualTimer);
-            humanVisualTimer = window.setTimeout(() => {
+            scheduleAudioRestore();
+        } else if (content.action === 'remotevideoloading') {
+            realTimeVideoReady.value = false;
+            humanVisualReady.value = false;
+            if (humanVisualTimer) {
+                window.clearTimeout(humanVisualTimer);
                 humanVisualTimer = 0;
-                if (showHuman.value && realTimeVideoReady.value) humanVisualReady.value = true;
-            }, 220);
+            }
         } else if (content.action === 'remoteVideoDisconnected') {
             realTimeVideoReady.value = false;
+            if (humanVisualTimer) {
+                window.clearTimeout(humanVisualTimer);
+                humanVisualTimer = 0;
+            }
             humanVisualReady.value = false;
         }
         if (content.action === 'localVideoMuted') {
-            if (parseMutedState(content.body)) videoIsMuted.value = true;
+            if (parseMutedState(content.body)) {
+                videoIsMuted.value = true;
+                if (audioUnlocked.value && soundEnabled.value) scheduleAudioRestore();
+            }
             if (soundEnabled.value && videoIsMuted.value && !audioUnlocked.value
                 && (pendingSpeechText.value || speechBusy.value)) {
                 soundUnlockTip.value = true;
@@ -440,17 +515,29 @@ const onMessage = (event) => {
             }
         }
     } else if (type === 'wsState') {
-        if (content.readyState === ReadyState.OPEN) wsConnected.value = true;
+        if (content.readyState === ReadyState.OPEN) {
+            wsConnected.value = true;
+            scheduleAudioRestore();
+        }
         else if (content.readyState === ReadyState.CLOSED || content.readyState === ReadyState.CLOSING) {
             wsConnected.value = false;
+            humanVisualReady.value = false;
+            if (humanVisualTimer) {
+                window.clearTimeout(humanVisualTimer);
+                humanVisualTimer = 0;
+            }
             speechBusy.value = false;
             activeSpeechRequestId.value = '';
         }
     } else if (type === 'msg') {
         const {action, requestId} = content;
+        if (requestId === activeSpeechRequestId.value && action === 'RENDER_START') {
+            scheduleAudioRestore();
+            scheduleHumanReveal(HUMAN_SCENE_REVEAL_DELAY_MS);
+        }
         if (requestId === activeSpeechRequestId.value && ['FINISHED', 'RENDER_ERROR', 'RENDER_INTERRUPTED'].includes(action)) {
             const replayAfterMutedPlayback = action === 'FINISHED' && soundEnabled.value
-                && videoIsMuted.value && currentSpeechText.value;
+                && !audioUnlocked.value && videoIsMuted.value && currentSpeechText.value;
             const replayText = replayAfterMutedPlayback ? currentSpeechText.value : '';
             speechBusy.value = false;
             activeSpeechRequestId.value = '';
@@ -458,33 +545,30 @@ const onMessage = (event) => {
             if (replayAfterMutedPlayback) {
                 pendingSpeechText.value = replayText;
                 soundUnlockTip.value = true;
-                releaseHuman(true, true);
+                showToolbar();
                 return;
             }
-            postSpeechDisconnectTimer = window.setTimeout(() => {
-                postSpeechDisconnectTimer = 0;
-                if (!pendingSpeechText.value && !speechBusy.value) releaseHuman(false, true);
-            }, POST_SPEECH_DISCONNECT_DELAY_MS);
         }
         if (action === 'DISCONNECT_ALERT') {
-            showTimeoutTip.value = true;
-            showToolbar();
+            // cp-inactiveDisconnectSec=0 后通常不会触发；收到旧会话提醒也保持连接。
+            showTimeoutTip.value = false;
         } else if (action === 'TIMEOUT_EXIT') disconnectHuman();
     }
 };
 
 watch([humanReady, videoIsMuted, soundEnabled, pendingSpeechText], () => void tryPlayPendingAnswer(), {flush: 'post'});
 onMounted(() => {
+    syncAudioUnlockFromBrowser();
     dhIframe.registerMessageReceived(onMessage);
     scheduleToolbarHide();
 });
 onUnmounted(() => {
     connectionGeneration += 1;
     clearToolbarTimer();
-    if (postSpeechDisconnectTimer) window.clearTimeout(postSpeechDisconnectTimer);
     if (humanVisualTimer) window.clearTimeout(humanVisualTimer);
     if (humanReleaseTimer) window.clearTimeout(humanReleaseTimer);
     if (standbyCrossfadeTimer) window.clearTimeout(standbyCrossfadeTimer);
+    clearAudioRestoreTimers();
     standbyVideos.forEach(video => video?.pause());
     dhIframe.removeMessageReceived(onMessage);
 });
@@ -493,18 +577,22 @@ onUnmounted(() => {
 <style scoped>
 #digital-human-iframe { width: 100%; height: 100%; border: none; display: block; }
 .realtime-dh-wrapper, .realtime-dh-stage { width: 100%; min-height: 100dvh; }
-.realtime-dh-wrapper { background: #f3f4fb; }
-.realtime-dh-stage { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; background: #f3f4fb; }
+.realtime-dh-wrapper { background: #5a2f1b; }
+.realtime-dh-stage { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; background: #5a2f1b; }
 .visual-stage { position: absolute; z-index: 0; left: 50%; top: 50%; width: min(100%, 177.7778dvh); aspect-ratio: 16 / 9; overflow: hidden; transform: translate(-50%, -50%); background: #5a2f1b; }
 .standby-scene, .human-frame { position: absolute; inset: 0; }
-.standby-scene { z-index: 0; overflow: hidden; background: #5a2f1b; }
-.standby-video { position: absolute; inset: 0; width: 100%; height: 100%; display: block; object-fit: cover; object-position: center; opacity: 0; background: #5a2f1b; transition: opacity 650ms ease-in-out, filter 500ms ease; }
+.standby-scene { z-index: 2; overflow: hidden; opacity: 0; background: #5a2f1b; transform: translateZ(0) scale(1.008); filter: brightness(.92); backface-visibility: hidden; will-change: opacity, transform, filter; transition: opacity 420ms ease-out, transform 1150ms cubic-bezier(.22, 1, .36, 1), filter 900ms ease; }
+.standby-scene.ready { opacity: 1; transform: translateZ(0) scale(1); filter: brightness(1); }
+.standby-scene.ready.human-mounted { transition: none; }
+.standby-scene.ready.human-mounted.human-active { opacity: 0; pointer-events: none; transition: opacity 180ms ease-out; }
+.standby-video { position: absolute; inset: 0; width: 100%; height: 100%; display: block; object-fit: cover; object-position: center; opacity: 0; background: #5a2f1b; transform: translateZ(0); backface-visibility: hidden; will-change: opacity, filter; transition: opacity 760ms cubic-bezier(.4, 0, .2, 1), filter 650ms ease; }
 .standby-video.visible, .standby-video.incoming { opacity: 1; }
 .standby-video.visible { z-index: 1; }.standby-video.incoming { z-index: 2; }
 .standby-scene.thinking .standby-video { filter: saturate(.92) brightness(.86); }
 .standby-shade { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(18, 8, 4, .03) 42%, rgba(17, 8, 4, .58) 100%); }
-.human-frame { z-index: 1; opacity: 0; overflow: hidden; background: #5a2f1b; pointer-events: none; transform: translateZ(0) scale(1.004); filter: blur(1.5px); backface-visibility: hidden; will-change: opacity, transform, filter; transition: opacity 900ms cubic-bezier(.4, 0, .2, 1), transform 1100ms cubic-bezier(.22, 1, .36, 1), filter 700ms ease-out; }
-.human-frame.ready { opacity: 1; pointer-events: auto; transform: translateZ(0) scale(1); filter: blur(0); }
+.human-frame { z-index: 1; overflow: hidden; background: #5a2f1b; pointer-events: none; transform: translateZ(0); backface-visibility: hidden; }
+.human-frame.ready { pointer-events: auto; }
+.human-frame :deep(#digital-human-iframe) { position: relative; z-index: 1; width: 100%; height: 100%; border: 0; display: block; }
 .thinking-panel { position: absolute; z-index: 2; left: 50%; bottom: clamp(120px, 17vh, 190px); display: flex; align-items: center; gap: 13px; min-width: min(360px, calc(100% - 36px)); padding: 13px 17px; transform: translateX(-50%); border: 1px solid rgba(255, 238, 220, .35); border-radius: 18px; color: #fff7ed; background: rgba(37, 18, 10, .7); box-shadow: 0 18px 48px rgba(20, 7, 2, .3); backdrop-filter: blur(13px); }
 .thinking-orbit { position: relative; flex: 0 0 36px; width: 36px; height: 36px; }
 .thinking-orbit span { position: absolute; inset: 0; border: 1px solid rgba(255, 221, 181, .44); border-radius: 50%; }
@@ -551,5 +639,5 @@ onUnmounted(() => {
     .realtime-dh-right-tip { bottom: calc(38dvh + 22px); }
 }
 @media (max-width: 520px) { .connection-toolbar { left: 8px; right: 8px; gap: 6px; padding: 6px; }.connection-badge { margin-right: auto; max-width: 102px; overflow: hidden; text-overflow: ellipsis; font-size: 11px; }.connection-toolbar :deep(.el-button) { padding: 7px 10px; }.thinking-orbit { flex-basis: 30px; width: 30px; height: 30px; }.thinking-orbit span:nth-child(3) { inset: 11px; } }
-@media (prefers-reduced-motion: reduce) { .standby-video, .human-frame { transition-duration: 0s; }.thinking-panel.active .thinking-orbit span, .thinking-dots i { animation: none; } }
+@media (prefers-reduced-motion: reduce) { .standby-scene, .standby-video, .human-frame { transition-duration: 0s; }.thinking-panel.active .thinking-orbit span, .thinking-dots i { animation: none; } }
 </style>
diff --git a/src/assets/media/standby.mp4 b/src/assets/media/standby.mp4
index 3475759..7a18e46 100644
Binary files a/src/assets/media/standby.mp4 and b/src/assets/media/standby.mp4 differ
diff --git a/src/components/Iframe/Index.vue b/src/components/Iframe/Index.vue
index 1008caa..893e889 100644
--- a/src/components/Iframe/Index.vue
+++ b/src/components/Iframe/Index.vue
@@ -19,13 +19,15 @@ export default {
             ttsPerson: null,
             'cp-ttsSample': '16000',
             initMode: 'noAudio',
-            videoBg: '#F3F4FB',
+            videoBg: '#5A2F1B',
             resolutionWidth: 1920,
             resolutionHeight: 1080,
             showDebugger: true,
             ttsPer: '20008742',
             backgroundImageUrl: 'https://meta-human-editor-test.cdn.bcebos.com/17f8e526-1530-48ab-b02a-1c6138e1da1e/ffda0bfd-a0f5-49cc-bff4-1501ac1aa155/defaultBg.png',
-            'cp-preAlertSec': 120,
+            // 连接由外层页面按 DeepSeek 30 秒超时规则管理，关闭百度组件自身的闲置退出提醒。
+            'cp-inactiveDisconnectSec': 0,
+            'cp-preAlertSec': 0,
             'cp-positionV2': '{"location":{"top":0,"left":0,"width":1920,"height":1080}}'
         };
         const QUERY_OVERRIDE_KEYS = new Set([
@@ -36,6 +38,7 @@ export default {
             'resolutionHeight',
             'showDebugger',
             'backgroundImageUrl',
+            'cp-inactiveDisconnectSec',
             'cp-preAlertSec',
             'cp-positionV2'
         ]);
diff --git a/src/components/Render/VoiceRender.vue b/src/components/Render/VoiceRender.vue
index a846391..3022d45 100644
--- a/src/components/Render/VoiceRender.vue
+++ b/src/components/Render/VoiceRender.vue
@@ -11,11 +11,12 @@ const OUTPUT_SAMPLE_RATE = 16_000;
 const SILENCE_AFTER_SPEECH_MS = 1_200;
 const TRAILING_SILENCE_PADDING_MS = 180;
 const MIN_VOICED_AUDIO_MS = 260;
-const MAX_UTTERANCE_MS = 55_000;
+const MAX_UTTERANCE_MS = 20_000;
 const PRE_ROLL_MS = 350;
 const PROCESSOR_BUFFER_SIZE = 1_024;
 const MIN_VOLUME_THRESHOLD = 0.012;
 const VOICE_TRIGGER_FRAMES = 2;
+const SPEECH_PEAK_HANGOVER_RATIO = 0.15;
 
 const props = defineProps({
     speechBusy: {type: Boolean, default: false},
@@ -24,6 +25,8 @@ const props = defineProps({
 const emit = defineEmits([
     'questionUpdated',
     'questionRecognized',
+    'speechDetected',
+    'speechAborted',
     'answerReady',
     'requestTimeout',
     'requestError',
@@ -58,11 +61,13 @@ let recording = false;
 let speechStartedAt = 0;
 let lastVoiceAt = 0;
 let voicedAudioMs = 0;
+let peakVoiceRms = 0;
 let audioFrames = [];
 let audioSampleCount = 0;
 let preRollFrames = [];
 let preRollSampleCount = 0;
 let microphonePermission = null;
+let captureLifecyclePromise = Promise.resolve();
 
 const canCapture = () => !disposed && !recognizing.value && !loading.value && !props.speechBusy && !props.playbackPending;
 
@@ -78,6 +83,7 @@ const resetUtterance = () => {
     speechStartedAt = 0;
     lastVoiceAt = 0;
     voicedAudioMs = 0;
+    peakVoiceRms = 0;
     audioFrames = [];
     audioSampleCount = 0;
     preRollFrames = [];
@@ -188,7 +194,10 @@ const recognizePcm = async (pcm) => {
     try {
         const response = await fetch('/api/baidu/asr', {
             method: 'POST',
-            headers: {'Content-Type': 'audio/pcm;rate=16000'},
+            headers: {
+                'Content-Type': 'audio/pcm;rate=16000',
+                'X-Audio-Duration-Ms': String(Math.round(pcm.byteLength / 2 / OUTPUT_SAMPLE_RATE * 1000))
+            },
             body: pcm,
             signal: controller.signal
         });
@@ -203,6 +212,7 @@ const recognizePcm = async (pcm) => {
         recognizing.value = false;
         await askDeepSeek(question);
     } catch (error) {
+        emit('speechAborted');
         if (error?.name !== 'AbortError') {
             const message = error?.message || '语音识别失败，请重新说一遍';
             emit('voiceStatus', `${message}，正在继续监听`);
@@ -229,6 +239,7 @@ const finishUtterance = () => {
     resetUtterance();
 
     if (!enoughVoice || sampleCount === 0) {
+        emit('speechAborted');
         emit('voiceStatus', '声音太短，正在继续监听');
         return;
     }
@@ -267,7 +278,10 @@ const processAudioFrame = (input) => {
     let squareSum = 0;
     for (let index = 0; index < frame.length; index += 1) squareSum += frame[index] * frame[index];
     const rms = Math.sqrt(squareSum / frame.length);
-    const threshold = Math.min(0.08, Math.max(MIN_VOLUME_THRESHOLD, noiseFloor * 3.2));
+    const baseThreshold = Math.min(0.08, Math.max(MIN_VOLUME_THRESHOLD, noiseFloor * 3.2));
+    const threshold = recording && peakVoiceRms > 0
+        ? Math.max(baseThreshold, peakVoiceRms * SPEECH_PEAK_HANGOVER_RATIO)
+        : baseThreshold;
     const voiceDetected = rms >= threshold;
     const now = performance.now();
     const frameDurationMs = frame.length / inputSampleRate * 1000;
@@ -282,6 +296,8 @@ const processAudioFrame = (input) => {
 
         if (consecutiveVoiceFrames >= VOICE_TRIGGER_FRAMES) {
             recording = true;
+            peakVoiceRms = rms;
+            emit('speechDetected');
             speechStartedAt = now;
             lastVoiceAt = now;
             voicedAudioMs = frameDurationMs * consecutiveVoiceFrames;
@@ -297,6 +313,7 @@ const processAudioFrame = (input) => {
     audioFrames.push(frame);
     audioSampleCount += frame.length;
     if (voiceDetected) {
+        peakVoiceRms = Math.max(peakVoiceRms, rms);
         lastVoiceAt = now;
         voicedAudioMs += frameDurationMs;
     }
@@ -354,6 +371,7 @@ const initializeVoice = async () => {
         if (!AudioContextConstructor) throw new Error('当前浏览器不支持网页录音处理');
         audioContext = new AudioContextConstructor({latencyHint: 'interactive'});
         inputSampleRate = audioContext.sampleRate;
+        noiseFloor = 0.003;
         sourceNode = audioContext.createMediaStreamSource(mediaStream);
         processorNode = audioContext.createScriptProcessor(PROCESSOR_BUFFER_SIZE, 1, 1);
         silentGainNode = audioContext.createGain();
@@ -400,7 +418,7 @@ const handleVisibilityChange = () => {
 };
 
 const resumeAutomaticListening = async () => {
-    if (disposed || document.hidden || initializing) return;
+    if (disposed || document.hidden || initializing || props.speechBusy || props.playbackPending) return;
     if (mediaStream?.active && audioContext) {
         await audioContext.resume().catch(() => undefined);
         if (audioContext.state === 'running') {
@@ -412,6 +430,16 @@ const resumeAutomaticListening = async () => {
     if (microphonePermission?.state !== 'denied') await initializeVoice();
 };
 
+const queueCaptureLifecycle = (operation) => {
+    captureLifecyclePromise = captureLifecyclePromise
+        .catch(() => undefined)
+        .then(operation)
+        .catch(error => {
+            if (!disposed) reportVoiceError(error?.message || '麦克风恢复失败，请检查浏览器权限');
+        });
+    return captureLifecyclePromise;
+};
+
 const handleMicrophonePermissionChange = () => {
     if (microphonePermission?.state === 'granted') {
         emit('voiceError', '');
@@ -440,11 +468,21 @@ const handleDeviceChange = () => {
     if (!mediaStream?.active) void resumeAutomaticListening();
 };
 
-watch(() => [props.speechBusy, props.playbackPending], ([speechBusy, playbackPending]) => {
+watch(() => [props.speechBusy, props.playbackPending], ([speechBusy, playbackPending], previous = [false, false]) => {
+    const answering = speechBusy || playbackPending;
+    const wasAnswering = previous[0] || previous[1];
     resetUtterance();
-    if (speechBusy || playbackPending) {
+    if (answering) {
         listening.value = false;
         emit('voiceStatus', '数字人正在回答');
+        if (!wasAnswering) {
+            // 口播开始前彻底释放麦克风，避免数字人扬声器声音和 WebRTC 音频路由
+            // 污染下一轮录音。浏览器已授权后，重新获取不会再次弹权限窗口。
+            void queueCaptureLifecycle(() => stopAudioCapture());
+        }
+    } else if (wasAnswering && !recognizing.value && !loading.value) {
+        // 口播结束后创建全新的 MediaStream 与 AudioContext；不能只修改 listening 状态。
+        void queueCaptureLifecycle(() => initializeVoice());
     } else if (!recognizing.value && !loading.value && mediaStream?.active) {
         listening.value = true;
         emit('voiceStatus', '麦克风已开启，请直接说话');
diff --git a/src/style.css b/src/style.css
index 350dc2a..f26240f 100644
--- a/src/style.css
+++ b/src/style.css
@@ -3,7 +3,7 @@
     line-height: 1.5;
     font-weight: 400;
     color: rgba(255, 255, 255, 0.87);
-    background-color: #242424;
+    background-color: #5a2f1b;
     font-synthesis: none;
     text-rendering: optimizeLegibility;
     -webkit-font-smoothing: antialiased;
@@ -20,6 +20,7 @@ body {
     margin: 0;
     padding: 0;
     overflow-x: hidden;
+    background-color: #5a2f1b;
 }
 
 #root {
@@ -29,6 +30,7 @@ body {
     height: 100%;
     margin: 0 auto;
     text-align: center;
+    background-color: #5a2f1b;
 }
 /* a {
   font-weight: 500;