* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        
     
        
        .containeer {
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 30px;
        }
        
        .nav-title {
            font-size: 28px;
            color: #333;
            margin-bottom: 30px;
            text-align: center;
            font-weight: 600;
            position: relative;
            padding-bottom: 10px;
        }
        
        .nav-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: #ff4757;
            border-radius: 3px;
        }
        
        .nav-wrapper {
            width: 80%;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            padding: 20px;
            overflow: hidden;
        }
        
        .navigation {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            list-style: none;
            padding: 0;
        }
        
        .nav-item {
            flex: 0 0 calc(11.11% - 10px);
            text-align: center;
            margin: 5px;
            position: relative;
        }
        
        .nav-link {
            display: block;
            text-decoration: none;
            color: #333;
            font-size: 16px;
            font-weight: 500;
            padding: 12px 5px;
            transition: all 0.3s ease;
            border-radius: 6px;
        }
        
        .nav-link:hover {
            color: #ff4757;
            background: rgba(255, 71, 87, 0.05);
        }
        
        .nav-link:hover::after {
            width: 70%;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: #ff4757;
            border-radius: 3px;
            transition: all 0.3s ease;
        }
        
        .nav-link.active {
            color: #ff4757;
            font-weight: 600;
        }
        
        .nav-link.active::after {
            width: 70%;
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .nav-item {
                flex: 0 0 calc(25% - 10px);
            }
            
            .nav-wrapper {
                width: 90%;
            }
        }
        
        @media (max-width: 768px) {
            .nav-item {
                flex: 0 0 calc(33.33% - 10px);
            }
            
            .nav-link {
                font-size: 14px;
                padding: 10px 5px;
            }
        }
        
        @media (max-width: 480px) {
            .nav-item {
                flex: 0 0 calc(50% - 10px);
            }
            
            .nav-wrapper {
                width: 95%;
                padding: 15px;
            }
            
            .nav-title {
                font-size: 24px;
            }
        }
        
        .instructions {
            margin-top: 30px;
            background: white;
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            width: 80%;
        }
        
        .instructions h3 {
            color: #ff4757;
            margin-bottom: 15px;
            text-align: center;
        }
        
        .instructions p {
            color: #666;
            line-height: 1.6;
            text-align: center;
        }