diff --git a/backend/app/mqtt.py b/backend/app/mqtt.py
index b485c76..78201f5 100644
--- a/backend/app/mqtt.py
+++ b/backend/app/mqtt.py
@@ -6,6 +6,7 @@
 
 import json
 import logging
+import os
 import threading
 import time
 import uuid
@@ -22,6 +23,11 @@ def new_cmd_id():
     return uuid.uuid4().hex[:12]
 
 
+def _unique_client_id(base):
+    """每个客户端进程使用唯一 client_id，避免与其它实例竞争被 broker 踢下线"""
+    return f"{base}-{os.getpid()}-{uuid.uuid4().hex[:6]}"
+
+
 class MqttHub:
     def __init__(self):
         self.client = None
@@ -37,7 +43,7 @@ class MqttHub:
             return
         try:
             self.client = mqtt.Client(
-                client_id=settings.MQTT_CLIENT_ID,
+                client_id=_unique_client_id(settings.MQTT_CLIENT_ID),
                 clean_session=True,
                 protocol=mqtt.MQTTv311,
             )
diff --git a/src/pages/MediaScreen.jsx b/src/pages/MediaScreen.jsx
index a561a2e..fc98401 100644
--- a/src/pages/MediaScreen.jsx
+++ b/src/pages/MediaScreen.jsx
@@ -16,6 +16,19 @@ import '../styles/mediascreen.css';
    页脚（园区概览条）按需保留，中间为全屏媒体播放器
    ========================================================= */
 
+/** 展示名清洗：URL 只取文件名，不显示完整播放地址 */
+function cleanName(name) {
+  if (!name) return '';
+  const text = String(name);
+  try {
+    const u = new URL(text);
+    const last = decodeURIComponent(u.pathname.split('/').filter(Boolean).pop() || '');
+    return last ? `${last}${u.search ? ' …' : ''}` : text;
+  } catch {
+    return text;
+  }
+}
+
 export default function MediaScreen() {
   const d = useParkSim();
   const navigate = useNavigate();
@@ -496,33 +509,33 @@ export default function MediaScreen() {
           </div>
         )}
 
-        {/* 中央播放控制（悬浮层） */}
+        {/* 右下角轻量播放控制（弱化） */}
         <div className={`ms-controls${loaded ? ' visible' : ''}`}>
           {/* 播放/暂停 */}
           <button className="ms-play" onClick={togglePlayPause} title={paused ? '播放' : '暂停'}>
-            <Icon name={paused ? 'play' : 'pause'} size={18} />
+            <Icon name={paused ? 'play' : 'pause'} size={15} />
           </button>
           {/* 上一段 / 下一段 */}
           <div className="ms-nav">
             <button onClick={() => skip(-1)} title="上一段">
-              <Icon name="chevron-left" size={16} />
+              <Icon name="chevron-left" size={13} />
             </button>
             <span className="ms-nav-num">
               <b>{currentItem ? `${index + 1}` : '0'}</b>
               <em>/ {list.length}</em>
             </span>
             <button onClick={() => skip(1)} title="下一段">
-              <Icon name="chevron-right" size={16} />
+              <Icon name="chevron-right" size={13} />
             </button>
           </div>
-          {/* 当前播放名 + LIVE（点击进入后台登录） */}
+          {/* 当前播放（仅文件名，不显示完整地址；点击进入后台） */}
           <div className="ms-now" onClick={handleTitleClick} title="点击进入后台" style={{ cursor: 'pointer' }}>
             <span className="ms-now-dot" />
-            <span className="ms-now-name">{currentItem ? currentItem.name : '等待播放…'}</span>
+            <span className="ms-now-name">{currentItem ? cleanName(currentItem.name) : '等待播放…'}</span>
           </div>
           {/* 声音 */}
           <div id="soundHint" className="ms-sound" style={{ display: soundBlocked && loaded ? 'flex' : 'none' }} onClick={enableSound}>
-            <Icon name="volume" size={16} />
+            <Icon name="volume" size={13} />
             点击开启声音
           </div>
         </div>
diff --git a/src/styles/mediascreen.css b/src/styles/mediascreen.css
index 6e70913..6758dc3 100644
--- a/src/styles/mediascreen.css
+++ b/src/styles/mediascreen.css
@@ -109,31 +109,32 @@
   border-bottom: 1px solid rgba(47, 107, 255, 0.3);
 }
 
-/* 中央播放控制层（悬浮） */
+/* 右下角轻量播放控制（弱化悬浮） */
 .ms-controls {
   position: absolute;
-  left: 50%;
-  bottom: 22px;
-  transform: translateX(-50%);
+  right: 16px;
+  bottom: 14px;
+  left: auto;
+  transform: none;
   z-index: 10;
   display: flex;
   align-items: center;
-  gap: 16px;
-  padding: 10px 18px;
-  background: rgba(255, 255, 255, 0.8);
-  border: 1px solid rgba(120, 160, 220, 0.2);
-  border-radius: 40px;
-  backdrop-filter: blur(16px);
-  -webkit-backdrop-filter: blur(16px);
-  box-shadow: 0 12px 40px rgba(56, 100, 170, 0.18);
+  gap: 8px;
+  padding: 6px 12px;
+  background: rgba(255, 255, 255, 0.55);
+  border: 1px solid rgba(120, 160, 220, 0.16);
+  border-radius: 30px;
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
+  box-shadow: 0 6px 22px rgba(56, 100, 170, 0.12);
   opacity: 0;
   transition: opacity 0.5s ease;
 }
 .ms-controls.visible { opacity: 1; }
 
 .ms-play {
-  width: 42px;
-  height: 42px;
+  width: 30px;
+  height: 30px;
   border-radius: 50%;
   border: none;
   display: flex;
@@ -142,7 +143,7 @@
   color: #fff;
   background: linear-gradient(140deg, var(--bd-blue, #2f6bff), var(--bd-cyan, #4cc2ff));
   cursor: pointer;
-  box-shadow: 0 6px 20px rgba(47, 107, 255, 0.4);
+  box-shadow: 0 4px 12px rgba(47, 107, 255, 0.3);
   transition: transform 0.2s;
 }
 .ms-play:hover { transform: scale(1.08); }
@@ -150,14 +151,14 @@
 .ms-nav {
   display: flex;
   align-items: center;
-  gap: 10px;
+  gap: 6px;
 }
 .ms-nav button {
-  width: 34px;
-  height: 34px;
+  width: 26px;
+  height: 26px;
   border-radius: 50%;
-  border: 1px solid rgba(47, 107, 255, 0.2);
-  background: rgba(255, 255, 255, 0.7);
+  border: 1px solid rgba(47, 107, 255, 0.18);
+  background: rgba(255, 255, 255, 0.6);
   color: var(--bd-blue, #2f6bff);
   display: flex;
   align-items: center;
@@ -172,32 +173,32 @@
 .ms-nav-num {
   display: inline-flex;
   align-items: baseline;
-  gap: 4px;
+  gap: 3px;
   font-family: "JetBrains Mono", "Oswald", monospace;
 }
 .ms-nav-num b {
-  font-size: 16px;
+  font-size: 13px;
   color: var(--bd-ink, #1d2c44);
 }
 .ms-nav-num em {
   font-style: normal;
-  font-size: 12px;
+  font-size: 10.5px;
   color: var(--bd-sub, #7d8fa9);
 }
 
 .ms-now {
   display: flex;
   align-items: center;
-  gap: 8px;
-  padding-left: 16px;
-  border-left: 1px solid rgba(47, 107, 255, 0.14);
+  gap: 6px;
+  padding-left: 10px;
+  border-left: 1px solid rgba(47, 107, 255, 0.12);
 }
 .ms-now-dot {
-  width: 8px;
-  height: 8px;
+  width: 6px;
+  height: 6px;
   border-radius: 50%;
   background: var(--bd-green, #17b26a);
-  box-shadow: 0 0 10px rgba(23, 178, 106, 0.8);
+  box-shadow: 0 0 8px rgba(23, 178, 106, 0.8);
   animation: msPulse 1.6s ease-in-out infinite;
 }
 @keyframes msPulse {
@@ -205,10 +206,10 @@
   50% { opacity: 0.4; transform: scale(0.75); }
 }
 .ms-now-name {
-  font-size: 13px;
-  font-weight: 600;
-  color: var(--bd-ink, #1d2c44);
-  max-width: 280px;
+  font-size: 11px;
+  font-weight: 500;
+  color: var(--bd-sub, #7d8fa9);
+  max-width: 160px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
@@ -218,13 +219,13 @@
 .ms-sound {
   display: inline-flex;
   align-items: center;
-  gap: 7px;
-  padding: 8px 16px;
-  font-size: 12.5px;
+  gap: 6px;
+  padding: 5px 11px;
+  font-size: 11px;
   font-weight: 500;
   color: #4a5b76;
-  background: rgba(255, 255, 255, 0.85);
-  border: 1px solid rgba(47, 107, 255, 0.16);
+  background: rgba(255, 255, 255, 0.75);
+  border: 1px solid rgba(47, 107, 255, 0.14);
   border-radius: 30px;
   cursor: pointer;
 }
diff --git a/src/utils/mqtt.js b/src/utils/mqtt.js
index 5fdb2a5..d5576b1 100644
--- a/src/utils/mqtt.js
+++ b/src/utils/mqtt.js
@@ -20,7 +20,8 @@ function notifyStatus() {
 export function connectMqtt() {
   if (client) return;
   try {
-    clientId = `dpm-screen-${Math.random().toString(16).slice(2, 8)}`;
+    // 每个页面会话生成唯一 client_id（时间戳 + 高熵随机），避免多屏/多实例竞争
+    clientId = `dpm-screen-${Date.now().toString(36)}-${Math.random().toString(16).slice(2, 12)}`;
     client = mqtt.connect(MQTT_URL, {
       reconnectPeriod: 3000,
       connectTimeout: 8000,