/* CSS Document */

 /* 右侧导航栏样式  right: 20px; */
        #side-nav {
            position: fixed;
            right: 5px;
            top: 60%;
            transform: translateY(-50%);
            width: 210px;
         /*   background-color: white;   transparent*/
			 background-color: white;
            border-radius: 8px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
            padding: 20px 15px;
            z-index: 1000;
            max-height: 80vh;
            overflow-y: auto;
            transition: all 0.3s ease;
        }
        
        /* 导航栏标题 */
        .nav-title {
            font-size: 16px;
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #3498db;
            text-align: center;
        }
        
        /* 导航链接列表 */
        .nav-list {
            list-style: none;
        }
        
        .nav-item {
            margin-bottom: 8px;
            border-left: 3px solid transparent;
            transition: all 0.2s ease;
        }
        
        .nav-item:hover {
            border-left-color: #3498db;
            background-color: #f8f9fa;
        }
        
        .nav-item.active {
            border-left-color: #e74c3c;
            background-color: #fef5f5;
        }
        
        .nav-link {
            display: block;
            padding: 8px 12px;
            color: #555;
            text-decoration: none;
            font-size: 14px;
            border-radius: 4px;
            transition: all 0.2s ease;
        }
        
        .nav-item:hover .nav-link {
            color: #2980b9;
            transform: translateX(3px);
        }
        
        .nav-item.active .nav-link {
            color: #e74c3c;
            font-weight: 600;
        }
        
      
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            #side-nav {
                width: 200px;
                right: 10px;
            }
        }
        
        @media (max-width: 992px) {
            #side-nav {
                position: static;
                transform: none;
                width: 100%;
                max-width: 400px;
                margin: 30px auto;
                max-height: none;
            }
            
            .content-container {
                margin-bottom: 30px;
            }
        }
        
        /* 返回顶部按钮 */
        #back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: #3498db;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 999;
            box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
            transition: all 0.3s ease;
            opacity: 0;
            visibility: hidden;
        }
        
        #back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        
        #back-to-top:hover {
            background-color: #2980b9;
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(52, 152, 219, 0.4);
        }