.container 
{
    max-width: 60%;
    margin: 0 auto;
    padding: 0 20px;
}
        
        /* 头部样式        */

        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            /* font-size: 24px; */
            /* font-weight: bold; */
        }
        
        /* .logo span {
            color: #4dabf7;
        } */
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 30px;
        }
        
        nav ul li a {
            color: white;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        nav ul li a:hover {
            color: #4dabf7;
        }
        
        /* 主要内容区域 */
        .main-content {
            padding :50px 0;
        }
        
        .section-title {
            font-size: 28px;
            color: #1a365d;
            margin-bottom: 03px;
            text-align: center;
            position: relative;
        }
        
        .section-title:after {
            content: "";
            display: block;
            
            width: 80px;
            height: 3px;
            background-color: #4dabf7;
            margin: 15px auto;
        }
        
        /* 研究所简介 */
        .about-intro {
            background-color: white;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .intro-text {
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 20px;
        }
        
        .intro-text p {
            margin-bottom: 20px;
        }
        
        /* 组织架构 */
        .organization {
            background-color: white;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .org-chart {
            display: flex;
            justify-content: center;
            margin-top: 30px;
        }
        
        .org-chart-box {
            text-align: center;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            margin: 0 10px;
            width: 200px;
        }
        
 /*        研究方向 */
        .research-directions {
            background-color: white;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .direction-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .direction-item {
            padding: 20px;
            border-left: 4px solid #4dabf7;
            background-color: #f8fafc;
        }
        
        .direction-item h4 {
            color: #1a365d;
            margin-bottom: 10px;
        }
        
        /* 历史沿革 */
        .history {
            background-color: #e6f2ff;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px 0;
        }
        
        .timeline::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 3px;
            background-color: #1a365d;
            transform: translateX(-50%);
        }
        
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        
        .timeline-content {
            padding: 20px;
            background-color: white;
            border-radius: 5px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
            margin-left: 50%;
            width: 45%;
        }
        
        .timeline-content::after {
            content: '';
            position: absolute;
            left: -10px;
            top: 20px;
            border-width: 10px 10px 10px 0;
            border-style: solid;
            border-color: transparent white transparent transparent;
        }
        
        .timeline-content h4 {
            color: #1a365d;
            margin-bottom: 10px;
        }
        
        /* 联系我们 */
        .contact {
            background-color: white;
            padding: 40px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .contact-info {
            display: flex;
            flex-wrap: wrap;
            margin:-top 30px;
        }
        
        .contact-item {
            flex: 1 1 300px;
            margin: 15px;
            padding: 20px;
            border: 1px solid #eee;
            border-radius: 5px;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .contact-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .contact-item h4 {
            color: #1a365d;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .contact-item h4 i {
            margin-right: 10px;
            color: #4dabf7;
        }
        
        /* 页脚 */
        footer {
            background-color: #1a365d;
            color: white;
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            margin-bottom: 30px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 200px;
            margin-bottom: 20px;
            padding: 0 15px;
        }
        
        .footer-column h3 {
            margin-bottom: 20px;
            font-size: 18px;
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 10px;
        }
        
        .footer-column ul li a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column ul li a:hover {
            color: #4dabf7;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .footer-bottom p {
            font-size: 14px;
            color: #aaa;
        }
        
        /* 响应式设计 */
        @media screen and (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 20px;
                justify-content: center;
            }
            
            nav ul li {
                margin: 0 10px;
            }
            
            .timeline::before {
                left: 30px;
            }
            
            .timeline-content {
                width: calc(100% - 60px);
                margin-left: 60px !important;
                margin-right: 0;
            }
            
            .timeline-content::after {
                left: -10px;
                border-left-color: white;
                border-right: 0;
            }
        }