消息列表、控制面板和消息输入框的顺序已调整为：

消息列表(最上方)
控制面板(中间)
消息输入框(最下方)
控制面板图标保持缩小状态(w-4 h-4)
保留了视觉分隔效果

client/mobile/components/Classroom/ClassroomLayout.tsx

@@ -46,7 +46,7 @@ export const ClassroomLayout = ({ children, role }: ClassroomLayoutProps) => {
               <div
                 id="remoteVideoContainer"
                 ref={remoteVideoContainer}
-                className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4"
+                className="grid grid-cols-1 md:grid-cols-2 gap-4"
               >
                 {/* 远程视频将在这里动态添加 */}
               </div>
@@ -56,102 +56,106 @@ export const ClassroomLayout = ({ children, role }: ClassroomLayoutProps) => {
 
         {/* 消息和控制面板列 */}
         <div className={`${showVideo ? 'w-96' : 'flex-1'} flex flex-col`}>
-          {/* 控制面板 */}
-          <div className="bg-white shadow-lg p-3 flex flex-col gap-3">
-            <div className="flex flex-wrap gap-2">
-            {role === Role.Teacher && (
-              <button
-                onClick={() => setShowVideo(!showVideo)}
-                className={`p-2 rounded-full ${showVideo ? 'bg-gray-500' : 'bg-gray-300'} text-white`}
-                title={showVideo ? '隐藏视频' : '显示视频'}
-              >
-                <VideoCameraIcon className="w-5 h-5" />
-              </button>
-            )}
-            <button
-              onClick={toggleCamera}
-              className={`p-2 rounded-full ${isCameraOn ? 'bg-green-500' : 'bg-red-500'} text-white`}
-              title={isCameraOn ? '关闭摄像头' : '开启摄像头'}
-            >
-              <CameraIcon className="w-5 h-5" />
-            </button>
-            <button
-              onClick={toggleAudio}
-              className={`p-2 rounded-full ${isAudioOn ? 'bg-green-500' : 'bg-red-500'} text-white`}
-              title={isAudioOn ? '关闭麦克风' : '开启麦克风'}
-            >
-              <MicrophoneIcon className="w-5 h-5" />
-            </button>
-            {role === Role.Teacher && (
-              <button
-                onClick={toggleScreenShare}
-                className={`p-2 rounded-full ${isScreenSharing ? 'bg-green-500' : 'bg-blue-500'} text-white`}
-                title={isScreenSharing ? '停止共享' : '共享屏幕'}
-              >
-                <ShareIcon className="w-5 h-5" />
-              </button>
-            )}
-            {role === Role.Teacher && shareLink && (
-              <button
-                onClick={() => setShowShareLink(!showShareLink)}
-                className="p-2 rounded-full bg-blue-500 text-white"
-                title="分享链接"
-              >
-                <ClipboardDocumentIcon className="w-5 h-5" />
-              </button>
-            )}
-          </div>
 
-          {showShareLink && shareLink && (
-            <div className="bg-blue-50 p-2 rounded">
-              <div className="flex items-center gap-1">
-                <input
-                  type="text"
-                  value={shareLink}
-                  readOnly
-                  className="flex-1 text-xs border rounded px-2 py-1 truncate"
+
+          {/* 消息区域 */}
+          <div className="bg-white shadow-lg p-4">
+            <div className="h-full flex flex-col">
+              {/* 消息列表 */}
+              <div className="flex-1 overflow-y-auto mb-1">
+                {messageList.map((msg, i) => (
+                  <div key={i} className="text-sm mb-1">{msg}</div>
+                ))}
+              </div>
+
+              {/* 控制面板 */}
+              <div className="bg-white shadow-lg p-2 flex flex-col gap-3 mb-1 border-b border-gray-200">
+                <div className="flex flex-wrap gap-2">
+                  {role === Role.Teacher && (
+                    <button
+                      onClick={() => setShowVideo(!showVideo)}
+                      className={`p-2 rounded-full ${showVideo ? 'bg-gray-500' : 'bg-gray-300'} text-white`}
+                      title={showVideo ? '隐藏视频' : '显示视频'}
+                    >
+                      <VideoCameraIcon className="w-4 h-4" />
+                    </button>
+                  )}
+                  <button
+                    onClick={toggleCamera}
+                    className={`p-2 rounded-full ${isCameraOn ? 'bg-green-500' : 'bg-red-500'} text-white`}
+                    title={isCameraOn ? '关闭摄像头' : '开启摄像头'}
+                  >
+                    <CameraIcon className="w-4 h-4" />
+                  </button>
+                  <button
+                    onClick={toggleAudio}
+                    className={`p-2 rounded-full ${isAudioOn ? 'bg-green-500' : 'bg-red-500'} text-white`}
+                    title={isAudioOn ? '关闭麦克风' : '开启麦克风'}
+                  >
+                    <MicrophoneIcon className="w-4 h-4" />
+                  </button>
+                  {role === Role.Teacher && (
+                    <button
+                      onClick={toggleScreenShare}
+                      className={`p-2 rounded-full ${isScreenSharing ? 'bg-green-500' : 'bg-blue-500'} text-white`}
+                      title={isScreenSharing ? '停止共享' : '共享屏幕'}
+                    >
+                      <ShareIcon className="w-4 h-4" />
+                    </button>
+                  )}
+                  {role === Role.Teacher && shareLink && (
+                    <button
+                      onClick={() => setShowShareLink(!showShareLink)}
+                      className="p-2 rounded-full bg-blue-500 text-white"
+                      title="分享链接"
+                    >
+                      <ClipboardDocumentIcon className="w-4 h-4" />
+                    </button>
+                  )}
+                </div>
+
+                {showShareLink && shareLink && (
+                  <div className="bg-blue-50 p-2 rounded">
+                    <div className="flex items-center gap-1">
+                      <input
+                        type="text"
+                        value={shareLink}
+                        readOnly
+                        className="flex-1 text-xs border rounded px-2 py-1 truncate"
+                      />
+                      <button
+                        onClick={() => navigator.clipboard.writeText(shareLink)}
+                        className="p-2 bg-blue-500 text-white rounded"
+                        title="复制链接"
+                      >
+                        <ClipboardDocumentIcon className="w-4 h-4" />
+                      </button>
+                    </div>
+                  </div>
+                )}
+                
+                {/* 角色特定内容 */}
+                <div className="flex-1 overflow-y-auto">
+                  {children}
+                </div>
+
+              </div>
+              <div className="relative">
+                <textarea
+                  value={msgText}
+                  onChange={(e) => setMsgText(e.target.value)}
+                  className="w-full border rounded px-2 py-1 pr-10"
+                  placeholder="输入消息..."
+                  rows={3}
                 />
                 <button
-                  onClick={() => navigator.clipboard.writeText(shareLink)}
-                  className="p-2 bg-blue-500 text-white rounded"
-                  title="复制链接"
+                  onClick={sendMessage}
+                  className="absolute right-2 bottom-2 p-1 bg-blue-500 text-white rounded-full"
                 >
-                  <ClipboardDocumentIcon className="w-4 h-4" />
+                  <PaperAirplaneIcon className="w-4 h-4" />
                 </button>
               </div>
             </div>
-          )}
-
-          {/* 角色特定内容 */}
-          <div className="flex-1 overflow-y-auto">
-            {children}
-          </div>
-        </div>
-
-          {/* 消息区域 */}
-          <div className="bg-white shadow-lg p-4 flex-1">
-            <div className="h-full flex flex-col">
-            <div className="flex-1 overflow-y-auto mb-2">
-              {messageList.map((msg, i) => (
-                <div key={i} className="text-sm mb-1">{msg}</div>
-              ))}
-            </div>
-            <div className="relative">
-              <textarea
-                value={msgText}
-                onChange={(e) => setMsgText(e.target.value)}
-                className="w-full border rounded px-2 py-1 pr-10"
-                placeholder="输入消息..."
-                rows={3}
-              />
-              <button
-                onClick={sendMessage}
-                className="absolute right-2 bottom-2 p-1 bg-blue-500 text-white rounded-full"
-              >
-                <PaperAirplaneIcon className="w-5 h-5" />
-              </button>
-            </div>
-            </div>
           </div>
 
         </div>