/* 全局样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            /* font-family: "Microsoft Yahei", sans-serif; */
			font-family: "宋体", "SimSun", serif;
        }

        body {
            padding: 20px;
            min-height: 2000px; /* 用于测试滚动 */
        }

        /* 浮动菜单栏容器 */
        .sidebar {
            position: fixed;
            top: 20px;
            left: 20px;
            bottom: 20px;
            width: 260px;
            background-color: #2c3e50;
            color: #fff;
            overflow-y: auto;
            transition: all 0.3s ease;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            border-radius: 8px;
            opacity: 0.95;
        }

        /* 菜单栏隐藏状态 */
        .sidebar.hidden {
            transform: translateX(-100%);
            opacity: 0;
            pointer-events: none;
        }

        /* 侧边栏呼出按钮 - 核心新增 */
        .sidebar-toggle-btn {
            position: fixed;
            top: 50%;
            left: 20px;
            transform: translateY(-50%);
            width: 40px;
            height: 120px;
            background-color: #2c3e50;
            color: #fff;
            border: none;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            writing-mode: vertical-lr; /* 文字竖向排列 */
            text-orientation: upright; /* 文字正立 */
            font-size: 14px;
            letter-spacing: 4px; /* 增加文字间距 */
            box-shadow: 2px 0 8px rgba(0,0,0,0.1);
            z-index: 999;
            transition: all 0.3s ease;
            opacity: 0.95;
        }

        /* 按钮隐藏状态（侧边栏显示时隐藏按钮） */
        .sidebar-toggle-btn.hidden {
            opacity: 0;
            pointer-events: none;
            transform: translateY(-50%) translateX(-100%);
        }

        .sidebar-toggle-btn:hover {
            background-color: #34495e;
        }

        /* 控制按钮容器 */
        .sidebar-controls {
            padding: 15px;
            border-bottom: 1px solid #34495e;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* 一键控制按钮样式 */
        .control-btn {
            background-color: #3498db;
            color: #fff;
            border: none;
            padding: 6px 12px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            transition: background-color 0.2s;
        }

        .control-btn:hover {
            background-color: #2980b9;
        }

        /* 菜单列表样式 */
        .menu-list {
            list-style: none;
        }

        /* 各级菜单样式 */
        .menu-item {
            border-bottom: 1px solid #34495e;
        }

        .menu-level-1 > .menu-link {
            padding: 12px 15px;
            font-size: 16px;
            font-weight: 500;
        }

        .menu-level-2 > .menu-link {
            padding: 10px 15px 10px 30px;
            font-size: 15px;
            background-color: #34495e;
        }

        .menu-level-3 > .menu-link {
            padding: 8px 15px 8px 45px;
            font-size: 14px;
            background-color: #3d5a77;
        }

        /* 菜单链接样式 */
        .menu-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #ecf0f1;
            text-decoration: none;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        .menu-link:hover {
            background-color: #1abc9c;
        }

        /* 展开/收起图标 */
        .expand-icon {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: solid #ecf0f1;
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
            transition: transform 0.2s ease;
        }

        .expand-icon.collapsed {
            transform: rotate(-135deg);
        }

        /* 子菜单容器 */
        .submenu {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .submenu.expanded {
            max-height: 2000px; /* 足够大的值容纳所有子菜单 */
        }

        /* 主内容区域 */
        .main-content {
            margin-left: 300px;
            padding: 20px;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .sidebar {
                width: 240px;
                top: 10px;
                left: 10px;
                bottom: 10px;
            }
            .sidebar-toggle-btn {
                left: 10px;
                width: 36px;
                height: 100px;
                font-size: 12px;
            }
            .main-content {
                margin-left: 0;
                margin-top: 20px;
            }
        }