.kefu-float {
            position: fixed;
            right: 20px;
            bottom: 80px;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: #0099ff;
            color: #fff;
            text-align: center;
            line-height: 60px;
            font-size: 14px;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .kefu-window {
            position: fixed;
            right: 20px;
            bottom: 90px;
            width: 340px;
            height: 500px;
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 0 15px rgba(0,0,0,0.1);
            display: none;
            flex-direction: column;
            z-index: 999;
            overflow: hidden;
        }
        .kefu-header {
            background: #0099ff;
            color: #fff;
            padding: 14px;
            font-weight: bold;
            display: flex;
            justify-content: space-between;
        }
        .close {cursor: pointer;}
        .chat-box {
            flex: 1;
            padding: 15px;
            overflow-y: auto;
            background: #f5f5f5;
        }
        .msg-item {
            display: flex;
            margin-bottom: 12px;
            align-items: flex-start;
        }
        .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            overflow: hidden;
            flex-shrink: 0;
        }
        .avatar img {width:100%;height:100%;object-fit:cover;}
        .msg {
            max-width: 70%;
            padding: 8px 12px;
            border-radius: 8px;
            font-size: 14px;
            line-height: 1.4;
        }
        .server-item {justify-content: flex-start;}
        .user-item {justify-content: flex-end;flex-direction: row-reverse;}
        .msg-server {
            background: #fff;
            border: 1px solid #ddd;
            margin:0 10px;
        }
        .msg-user {
            background: #0099ff;
            color: #fff;
            margin:0 10px;
        }
        .chat-input {
            display: flex;
            padding: 10px;
            border-top: 1px solid #eee;
        }
        .chat-input input {
            flex: 1;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 20px;
            outline: none;
        }
        .chat-input button {
            margin-left: 8px;
            padding: 0 15px;
            background: #0099ff;
            color: #fff;
            border: none;
            border-radius: 20px;
            cursor: pointer;
        }