diff --git a/.gitattributes b/.gitattributes
index 236a71b..1ce20a5 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -4,3 +4,4 @@
 *.png -text
 *.jpg -text
 *.jpeg -text
+*.sh text eol=lf
diff --git a/deploy.sh b/deploy.sh
index 8d1237c..b2da242 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -16,8 +16,7 @@ if ! docker compose version >/dev/null 2>&1; then
   exit 1
 fi
 
-# Do not reuse an old frontend layer: media files must always come from the
-# currently uploaded source package.
+# Force a fresh image so replaced media files cannot be hidden by build cache.
 docker compose build --no-cache shuziren
 docker compose up -d --force-recreate --remove-orphans shuziren
 
diff --git a/src/App.vue b/src/App.vue
index 4c07de3..f656119 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,6 +1,6 @@
 <template>
     <main class="realtime-dh-wrapper">
-        <section class="realtime-dh-stage" @pointerdown.capture="unlockAudioAndPlay">
+        <section class="realtime-dh-stage" @pointerdown.capture.once="unlockAudioAndPlay">
             <div class="visual-stage">
                 <div class="standby-scene" :class="{thinking: waitingForAnswer}">
                     <video
@@ -92,11 +92,11 @@
                     type="button"
                     class="sound-button"
                     :class="{enabled: soundEnabled}"
-                    :aria-label="soundEnabled ? '关闭声音' : '开启声音'"
-                    :title="soundEnabled ? '声音已开启，点击关闭' : '声音已关闭，点击开启'"
-                    @click="handleMute"
+                    aria-label="开启并保持数字人声音"
+                    title="开启并保持声音"
+                    @click="enableSound"
                 >
-                    <img :src="soundEnabled ? VoiceSvg : MutedSvg" class="mute-icon" alt="" />
+                    <img :src="soundEnabled && audioUnlocked ? VoiceSvg : MutedSvg" class="mute-icon" alt="" />
                 </button>
             </div>
 
@@ -322,8 +322,10 @@ const tryPlayPendingAnswer = async () => {
             const canPlayWithSound = audioUnlocked.value || await checkPlayUnMute();
             if (generation !== connectionGeneration || !humanReady.value) return;
             if (!canPlayWithSound) {
+                if (!soundUnlockTip.value) {
+                    ElMessage.warning('请点击一次小喇叭开启数字人声音');
+                }
                 soundUnlockTip.value = true;
-                ElMessage.warning('请点击屏幕任意位置，数字人将开启声音并重新口播');
                 showToolbar();
                 return;
             }
@@ -331,7 +333,7 @@ const tryPlayPendingAnswer = async () => {
             dhIframe.playVideo(true);
             dhIframe.muteAudio(false);
             videoIsMuted.value = false;
-            await new Promise(resolve => setTimeout(resolve, 350));
+            await new Promise(resolve => window.setTimeout(resolve, 240));
         } else if (!soundEnabled.value && !videoIsMuted.value) {
             dhIframe.muteAudio(true);
             videoIsMuted.value = true;
@@ -381,32 +383,9 @@ const handleVoiceError = (message) => {
 const handleVoiceStatus = (message) => {
     voiceStatus.value = message;
 };
-const handleMute = () => {
-    const nextEnabled = !soundEnabled.value;
-    soundEnabled.value = nextEnabled;
-    if (nextEnabled) {
-        audioUnlocked.value = true;
-        soundUnlockTip.value = false;
-        if (showHuman.value) dhIframe.playVideo(true);
-    } else {
-        soundUnlockTip.value = false;
-    }
-    if (!showHuman.value) {
-        showToolbar();
-        return;
-    }
-    dhIframe.muteAudio(!nextEnabled);
-    window.setTimeout(() => {
-        if (showHuman.value) {
-            videoIsMuted.value = !nextEnabled;
-            if (nextEnabled) void tryPlayPendingAnswer();
-        }
-    }, 300);
-    showToolbar();
-};
 const unlockAudioAndPlay = () => {
-    if (!soundEnabled.value) return;
     if (audioUnlocked.value && !soundUnlockTip.value) return;
+    soundEnabled.value = true;
     audioUnlocked.value = true;
     soundUnlockTip.value = false;
     if (showHuman.value) {
@@ -418,6 +397,20 @@ const unlockAudioAndPlay = () => {
         connectHuman();
     }
 };
+const enableSound = () => {
+    soundEnabled.value = true;
+    audioUnlocked.value = true;
+    soundUnlockTip.value = false;
+    if (showHuman.value) {
+        dhIframe.playVideo(true);
+        dhIframe.muteAudio(false);
+        videoIsMuted.value = false;
+        window.setTimeout(() => void tryPlayPendingAnswer(), 120);
+    } else if (pendingSpeechText.value) {
+        connectHuman();
+    }
+    showToolbar();
+};
 const keepConnectionAlive = () => {
     showTimeoutTip.value = false;
     sendSpeech('我还在，很高兴继续为你服务。');
@@ -439,7 +432,7 @@ const onMessage = (event) => {
             humanVisualReady.value = false;
         }
         if (content.action === 'localVideoMuted') {
-            videoIsMuted.value = parseMutedState(content.body);
+            if (parseMutedState(content.body)) videoIsMuted.value = true;
             if (soundEnabled.value && videoIsMuted.value && !audioUnlocked.value
                 && (pendingSpeechText.value || speechBusy.value)) {
                 soundUnlockTip.value = true;