/* 您的CSS样式保持不变 */
        :root {
            --primary-color: #1a4b8c;
            --secondary-color: #2c6cb0;
            --accent-color: #4c8cda;
            --light-color: #e6f0fa;
            --dark-color: #0a2a5c;
            --text-color: #333;
            --light-text: #fff;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            color: var(--text-color);
            line-height: 1.6;
            background-color: #f9f9f9;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航栏样式 */
        header {
            background-color: var(--primary-color);
            color: var(--light-text);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            display: flex;
            align-items: center;
        }

        .logo h1 {
            font-size: 1.5rem;
            white-space: nowrap;
        }

        .nav-right {
            display: flex;
            align-items: center;
        }

        .nav-links {
            display: flex;
            list-style: none;
            margin-right: 20px;
        }

        .nav-links li {
            margin-left: 20px;
        }

        .nav-links a {
            color: var(--light-text);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
            cursor: pointer;
            font-size: 0.95rem;
        }

        .nav-links a:hover {
            color: var(--accent-color);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--accent-color);
        }

        .language-switch {
            font-size: 0.9rem;
            color: #ccc;
        }

        .language-switch a {
            color: #ccc;
            text-decoration: none;
            padding: 5px 10px;
            border-radius: 3px;
            transition: all 0.3s;
            cursor: pointer;
        }

        .language-switch a.active {
            color: var(--light-text);
            font-weight: bold;
            background-color: rgba(255, 255, 255, 0.1);
        }

        .language-switch a:hover {
            color: var(--light-text);
            background-color: rgba(255, 255, 255, 0.2);
        }

        .mobile-menu {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }

        /* 导航栏页面标签字号 更精确地只针对英文环境 */
        [data-lang="en"] .nav-links a {
            font-size: 0.85rem;
        }

        /* 标题样式 调整课题组名称显示*/
        .logo h1 {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }

        .main-title {
            font-size: 1.5rem;
            font-weight: 700;
            white-space: nowrap;
        }

        .sub-title {
            font-size: 1.1rem;
            font-weight: 400;
            opacity: 0.9;
            margin-top: 4px;
        }

        /* 标题样式 调整课题组名称显示 英文标题特殊调整 */
        [data-lang="en"] .main-title {
            font-size: 1.6rem;
        }

        [data-lang="en"] .sub-title {
            font-size: 1.0rem;
        }

        /* 主内容区样式 */
        main {
            margin-top: 80px;
            min-height: calc(100vh - 200px);
        }

        .content-section {
            display: none;
            padding: 80px 0;
        }

        .content-section.active {
            display: block;
        }

        .content-section:nth-child(even) {
            background-color: var(--light-color);
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            color: var(--primary-color);
            font-size: 1.5rem;
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
        }

        .research-detail-image {
            width: 100%;
            max-width: 500px; /* 限制最大宽度，避免图片太宽 */
            margin: 0 auto; /* 居中显示 */
        }

        .research-detail-image img {
            width: 100%;
            height: auto;
            border-radius: 10px;
            display: block; /* 避免图片底部有间隙 */
        }

        /* 图片加载失败时的备用样式 */
        .member-img,
        .alumni-img,
        .profile-img {
            position: relative;
        }
        .member-img::after,
        .alumni-img::after,
        .profile-img::after {
            content: '\f007'; /* Font Awesome user icon */
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 3rem;
            color: #6c757d;
            display: none; /* 默认隐藏，只在图片加载失败时显示 */
        }

        /* 图片加载失败时显示备用图标 */
        .member-img.failed::after,
        .alumni-img.failed::after,
        .profile-img.failed::after {
            display: block;
        }

        /* 统一图片容器样式 */
        .member-img,
        .alumni-img,
        .profile-img,
        .news-img-container {
            position: relative;
            overflow: hidden;
            background-color: #e9ecef; /* 统一背景色 */
            display: flex;
            align-items: center;
            justify-content: center;
            color: #6c757d;
        }

        .member-img {
            height: 200px;
        }

        .alumni-img {
            height: 160px;
        }

        .news-img-container {
            height: 220px;
            background-color: #ddd; /* 新闻图片保持灰色背景 */
        }

        /* 统一图片样式 */
        .member-img img,
        .alumni-img img,
        .profile-img img,
        .news-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        /* 统一卡片基础样式 */
        .member-card,
        .alumni-card,
        .news-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }


        /* 研究卡片特殊样式 */
        .research-card {
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: flex-start;
            min-height: 150px;
            padding-right: 60px;
        }

        .research-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background-color: var(--accent-color);
        }

        .research-card h3 {
            color: var(--primary-color);
            margin-bottom: 15px;
            font-size: 1.4rem;
            width: 100%;
        }

        .research-card p {
            width: 100%;
            margin-bottom: 0;
        }

        .research-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        /* 统一图片悬停效果 */
        .member-card:hover .member-img img,
        .alumni-card:hover .alumni-img img,
        .news-card:hover .news-img-container img {
            transform: scale(1.05);
        }

        /* 首页样式 */
        .home-hero {
            padding: 60px 0;
            background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.9)),
                        #f0f0f0;
            background-size: cover;
            background-position: center;
        }

        .home-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .research-intro {
            margin-bottom: 40px;
            background-color: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
        }

        .research-intro:hover {
            transform: translateY(-5px);
        }

        .research-intro h2 {
            color: var(--primary-color);
            margin-bottom: 20px;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
        }

        .research-intro h2 i {
            margin-right: 10px;
            color: var(--accent-color);
        }

        .research-intro p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .research-intro .btn {
            margin-top: 10px;
        }

        .profile-section {
            background-color: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
            max-width: 90%; /* 添加最大宽度限制 */
            margin: 0 auto; /* 确保居中 */
        }

        .profile-section:hover {
            transform: translateY(-5px);
        }

        .profile-img {
            width: 50%;
            height: 300px;
            margin-bottom: 20px;
            border-radius: 8px;
            margin-left: auto;
            margin-right: auto;
            color: white; /* 保持白色，因为备用图标需要白色 */
            font-size: 1.2rem;
        }

        .profile-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 8px;
        }

        .profile-info h3 {
            color: var(--primary-color);
            margin-bottom: 15px;
            font-size: 1.4rem;
            display: flex;
            align-items: center;
        }

        .profile-info h3 i {
            margin-right: 10px;
            color: var(--accent-color);
        }

        .profile-info p {
            margin-bottom: 15px;
            line-height: 1.6;
        }

        .news-section {
            margin-top: 40px;
            padding-top: 40px;
            border-top: 1px solid #eee;
        }

        .news-section h3 {
            color: var(--primary-color);
            margin-bottom: 20px;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
        }

        .news-section h3 i {
            margin-right: 10px;
            color: var(--accent-color);
        }

        .news-links {
            display: grid;
            grid-template-columns: 1fr;
            gap: 15px;
        }

        .news-link {
            display: block;
            padding: 20px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            text-decoration: none;
            color: var(--text-color);
            transition: all 0.3s;
            border-left: 4px solid var(--accent-color);
        }

        .news-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
            color: var(--primary-color);
        }

        .news-link h4 {
            margin-bottom: 8px;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
        }

        .news-link h4 i {
            margin-right: 8px;
            color: var(--accent-color);
        }

        .news-link p {
            color: #666;
            font-size: 0.95rem;
        }

        /* 研究方向样式 */

       /* 研究概要文字样式 */
        .research-intro-text {
            max-width: 800px;
            margin: 0 auto 50px;
            text-align: left;
        }

        .research-intro-text p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 20px;
            color: #555;
            text-indent: 2em; /* 两字符缩进 */
            text-align: left; /* 确保左对齐 */
        }

        .research-grid {
            display: flex;
            flex-direction: column; /* 改为纵向排列 */
            gap: 30px;
            max-width: 800px; /* 限制最大宽度，避免卡片太宽 */
            margin: 0 auto; /* 居中显示 */
        }

        /* 成员样式 */
        .members-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 30px;
        }

        .member-card {
            text-align: center; /* 只保留特有样式 */
        }

        .member-info {
            padding: 20px;
        }

        .member-info h3 {
            color: var(--primary-color);
            margin-bottom: 8px;
            font-size: 1.2rem;
        }

        .member-role {
            color: var(--secondary-color);
            font-weight: 500;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }

        .member-info p {
            font-size: 0.9rem;
            line-height: 1.4;
            color: #555;
        }

        /* 毕业学生样式 */
        .alumni-section {
            margin-top: 60px;
        }

        .alumni-title {
            text-align: center;
            color: var(--primary-color);
            font-size: 1.8rem;
            margin-bottom: 40px;
            position: relative;
        }

        .alumni-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--accent-color);
        }

        .alumni-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 25px;
        }

        .alumni-card {
            text-align: center; /* 只保留特有样式 */
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08); /* 校友卡片保持较浅阴影 */
        }

        .alumni-info {
            padding: 15px 10px;
        }

        .alumni-info h4 {
            color: var(--primary-color);
            margin-bottom: 6px;
            font-size: 1rem;
        }

        .alumni-degree {
            color: var(--secondary-color);
            font-weight: 500;
            margin-bottom: 4px;
            font-size: 0.9rem;
        }

        .alumni-year {
            color: #666;
            font-size: 0.8rem;
            line-height: 1.3;
        }

        /* 发表文章样式 */
        .publications-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .publication-item {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }

        .publication-item:last-child {
            border-bottom: none;
        }

        .publication-title {
            font-weight: 600;
            margin-bottom: 5px;
            color: var(--dark-color);
            line-height: 1.4;  /* 添加行高控制 */
        }

        .publication-authors {
            font-style: italic;
            margin-bottom: 5px;
            color: #666;
            line-height: 1.4;  /* 添加行高控制 */
        }

        .publication-journal {
            color: var(--secondary-color);
            font-weight: 500;
            line-height: 1.4;  /* 添加行高控制 */
        }

        .publication-doi {
            margin-top: 7px;
            font-size: 0.92rem;
            line-height: 1.4;
        }

        .publication-doi a {
            color: var(--primary-color);
            text-decoration-thickness: 1px;
            text-underline-offset: 3px;
            overflow-wrap: anywhere;
        }

        .publication-doi a:hover,
        .publication-doi a:focus-visible {
            color: var(--accent-color);
        }

        /* 新闻样式 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }

        .news-content {
            padding: 25px;
        }

        .news-date {
            color: var(--accent-color);
            font-weight: 500;
            margin-bottom: 12px;
            font-size: 0.9rem;
        }

        .news-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark-color);
            line-height: 1.4;
        }

        .news-summary {
            color: #666;
            line-height: 1.6;
        }

        /* 加入我们样式 */
        .join-content {
            max-width: 980px;
            margin: 0 auto;
            text-align: left;
        }

        .join-content p {
            margin-bottom: 16px;
            font-size: 1rem;
            line-height: 1.7;
        }

        .join-hero,
        .join-panel,
        .join-contact,
        .join-location {
            background: #fff;
            border: 1px solid rgba(25, 64, 96, 0.11);
            border-radius: 14px;
            box-shadow: 0 8px 26px rgba(28, 56, 78, 0.07);
        }

        .join-hero {
            position: relative;
            overflow: hidden;
            padding: 38px 42px;
            margin-bottom: 28px;
            background: linear-gradient(135deg, rgba(25, 64, 96, 0.98), rgba(39, 97, 133, 0.93));
            color: #fff;
        }

        .join-hero::after {
            content: '';
            position: absolute;
            width: 220px;
            height: 220px;
            right: -92px;
            top: -105px;
            border: 34px solid rgba(255, 255, 255, 0.08);
            border-radius: 50%;
        }

        .join-hero h3 {
            position: relative;
            z-index: 1;
            max-width: 760px;
            margin-bottom: 16px;
            font-size: clamp(1.55rem, 3vw, 2.2rem);
            line-height: 1.3;
        }

        .join-hero p {
            position: relative;
            z-index: 1;
            max-width: 780px;
            color: rgba(255, 255, 255, 0.92);
        }

        .join-hero .join-note {
            margin: 22px 0 0;
            padding-top: 18px;
            border-top: 1px solid rgba(255, 255, 255, 0.23);
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.82);
        }

        .join-eyebrow {
            margin-bottom: 9px !important;
            color: var(--accent-color);
            font-size: 0.82rem !important;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .join-hero .join-eyebrow {
            color: #bfe7ff;
        }

        .join-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 24px;
            margin-bottom: 24px;
        }

        .join-panel {
            padding: 28px 30px;
        }

        .join-panel h3,
        .join-contact h3,
        .join-location h3 {
            color: var(--primary-color);
            margin-bottom: 14px;
            line-height: 1.35;
        }

        .join-panel h3 i {
            width: 1.4em;
            color: var(--accent-color);
        }

        .join-panel ul,
        .join-panel ol {
            margin: 0 0 18px;
            padding-left: 1.25rem;
        }

        .join-panel li {
            margin-bottom: 10px;
            padding-left: 4px;
            line-height: 1.6;
        }

        .join-inline-link,
        .join-map-link {
            color: var(--primary-color);
            font-weight: 650;
            text-decoration-thickness: 1px;
            text-underline-offset: 4px;
        }

        .join-inline-link:hover,
        .join-inline-link:focus-visible,
        .join-map-link:hover,
        .join-map-link:focus-visible {
            color: var(--accent-color);
        }

        .join-contact {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            margin-bottom: 24px;
            padding: 28px 30px;
        }

        .join-contact p:last-child,
        .join-location-heading p:last-child {
            margin-bottom: 0;
        }

        .join-contact .btn {
            flex: 0 0 auto;
        }

        .join-location {
            overflow: hidden;
        }

        .join-location-heading {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            padding: 28px 30px;
        }

        .map-shell {
            position: relative;
            overflow: hidden;
            border-top: 1px solid rgba(25, 64, 96, 0.11);
            background: #eef4f7;
        }

        .map-container,
        .map-frame {
            width: 100%;
            min-height: 360px;
        }

        .map-frame {
            display: block;
            height: 390px;
            border: 0;
            background: #eef4f7;
        }

        .map-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding: 14px 20px;
            color: #536674;
            border-top: 1px solid rgba(25, 64, 96, 0.11);
            background: #f7fafc;
        }

        .map-meta p {
            margin: 0;
            font-size: 0.86rem;
            line-height: 1.5;
        }

        .map-meta a {
            flex: 0 0 auto;
            color: var(--primary-color);
            font-size: 0.84rem;
            font-weight: 650;
            text-decoration-thickness: 1px;
            text-underline-offset: 3px;
        }

        .map-meta a:hover,
        .map-meta a:focus-visible {
            color: var(--accent-color);
        }

        [hidden] {
            display: none !important;
        }

        /* 科普样式 */
        .popular-education {
            max-width: 800px;
            margin: 0 auto;
            background-color: white;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }

        .education-intro {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        /* 按钮样式 */
        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--light-text);
            padding: 12px 30px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: 2px solid var(--accent-color);
            cursor: pointer;
        }

        .btn:hover {
            background-color: transparent;
            color: var(--accent-color);
        }

        /* 改进校友卡片样式 */
        .alumni-card {
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
        }

        .alumni-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }

        .alumni-info {
            padding: 15px 10px;
        }

        .alumni-info h4 {
            font-size: 1rem;
        }

        /* 移动端样式调整 */

        @media (max-width: 768px) {

            .members-grid {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
                gap: 20px;
            }

            .member-info {
                padding: 15px;
            }

            .member-info h3 {
                font-size: 1.1rem;
            }

            .member-info p {
                font-size: 0.85rem;
            }

            .alumni-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
                gap: 20px;
            }

            .alumni-title {
                font-size: 1.5rem;
                margin-bottom: 30px;
            }

            .alumni-section {
                margin-top: 40px;
            }

            .nav-container {
                flex-direction: column;
                text-align: center;
            }

            .nav-links {
                display: none;
                margin-top: 15px;
                flex-direction: column;
                width: 100%;
                margin-right: 0;
            }

            .nav-links.active {
                display: flex;
            }

            .nav-links li {
                margin: 10px 0;
            }

            .language-switch {
                margin-top: 15px;
            }

            .mobile-menu {
                display: block;
                position: absolute;
                right: 20px;
                top: 20px;
            }

            .home-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            main {
                margin-top: 120px;
            }

            .content-section {
                padding: 50px 0;
            }

            .section-title {
                font-size: 1.5rem;
            }

             .research-detail-body {
                display: flex !important; /* 强制使用flex布局 */
                flex-direction: column !important; /* 强制垂直排列 */
                grid-template-columns: 1fr !important; /* pc端是grid，覆盖为单列 */
                gap: 30px;
            }

            .research-detail-text {
                order: 1; /* 文字在上 */
                width: 100% !important;
            }

            .research-detail-image {
                order: 2; /* 图片在下 */
                width: 100% !important;
                max-width: 100% !important;
                margin: 0 auto !important; /* 确保居中 */
            }

            .research-detail-image img {
                max-height: 400px;
                width: 100% !important;
            }

            .profile-img {
                width: 70%; /* 从80%减小到70% */
                height: 300px; /* 从350px减小到300px */
            }

            .profile-section {
                padding: 20px; /* 移动端内边距也减小 */
                max-width: 95%; /* 移动端宽度更大一些 */
            }

            /* 移动端适配 标题样式 */
            .main-title {
                font-size: 1.3rem;
            }

            .sub-title {
                font-size: 0.8rem;
            }

            [data-lang="en"] .main-title {
                font-size: 1.2rem;
            }

            [data-lang="en"] .sub-title {
                font-size: 0.75rem;
            }
        }

        /* 页脚样式 */
        footer {
            background-color: var(--dark-color);
            color: var(--light-text);
            padding: 60px 0 30px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-section h3 {
            margin-bottom: 20px;
            font-size: 1.3rem;
            color: var(--accent-color);
        }

        .footer-section p, .footer-section a {
            color: #ccc;
            margin-bottom: 10px;
            display: block;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-section a:hover {
            color: var(--accent-color);
        }

        .footer-section i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }

        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 0.9rem;
        }

        /* 语言切换内容样式 */
        .lang-content {
            display: none;
        }

        .lang-content.active {
            display: block;
        }

        /* 可点击卡片样式 */
        .research-card.clickable {
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            padding-right: 50px;
        }

        .card-arrow {
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--accent-color);
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }

        .research-card.clickable:hover .card-arrow {
            transform: translateY(-50%) translateX(5px);
        }

        /* 研究方向3个页面样式 */
        .research-detail-content {
            max-width: 1000px;
            margin: 0 auto;
        }

        .research-detail-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .research-detail-body {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 30px;
            align-items: start;
            margin-bottom: 40px;
        }

        /* 研究详情图片 - 竖版自适应 */
        .research-detail-image {
            width: 100%;
            max-width: 800px; /* 保持这个限制 */
            margin: 0 auto; /* 保持居中 */
        }

        .research-detail-image img {
            width: 100%;
            height: auto;
            border-radius: 10px;
            display: block;
            object-fit: contain; /* 新增：保持比例不裁剪 */
        }

        .research-detail-text {
            font-size: 1.1rem;
            line-height: 1.8;
        }

        .research-detail-text h3 {
            color: var(--primary-color);
            margin: 25px 0 15px;
            font-size: 1.4rem;
        }

        .research-detail-text h3:first-child {
            margin-top: 0;
        }


        .back-button {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background-color: var(--light-color);
            color: var(--primary-color);
            padding: 12px 25px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 2px solid var(--light-color);
        }

        .back-button:hover {
            background-color: transparent;
            border-color: var(--primary-color);
        }

        /* 结构、可访问性与窄屏增强 */
        html {
            scroll-behavior: smooth;
        }

        body {
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
        }

        .skip-link {
            position: fixed;
            top: 8px;
            left: 8px;
            z-index: 2000;
            transform: translateY(-150%);
            padding: 10px 14px;
            border-radius: 4px;
            background: #fff;
            color: var(--dark-color);
            font-weight: 700;
        }

        .skip-link:focus {
            transform: translateY(0);
        }

        #main-content:focus {
            outline: none;
        }

        .language-switch button,
        .mobile-menu {
            font: inherit;
        }

        .language-switch button {
            border: 0;
            color: #ccc;
            background: transparent;
            padding: 5px 10px;
            border-radius: 3px;
            cursor: pointer;
        }

        .language-switch button.active {
            color: var(--light-text);
            font-weight: 700;
            background-color: rgba(255, 255, 255, 0.1);
        }

        .language-switch button:hover {
            color: var(--light-text);
            background-color: rgba(255, 255, 255, 0.2);
        }

        .mobile-menu {
            border: 0;
            padding: 8px;
            border-radius: 4px;
            background: transparent;
            color: var(--light-text);
        }

        :where(a, button):focus-visible {
            outline: 3px solid #ffd166;
            outline-offset: 3px;
        }

        .research-card.clickable {
            width: 100%;
            color: inherit;
            text-decoration: none;
        }

        .research-card.clickable:focus-visible {
            transform: translateY(-4px);
            box-shadow: 0 0 0 4px rgba(76, 140, 218, 0.28), 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        .news-grid {
            grid-template-columns: repeat(auto-fit, minmax(min(100%, 350px), 1fr));
        }

        .book-chapters {
            margin-top: 50px;
        }

        .book-chapters h3 {
            margin-bottom: 30px;
            color: var(--primary-color);
            font-size: 1.5rem;
        }

        .noscript-message {
            padding: 40px;
            border-radius: 8px;
            background: #fff;
        }

        .noscript-message a {
            color: var(--primary-color);
        }

        @media (max-width: 768px) {
            .container {
                width: 100%;
                padding-right: 16px;
                padding-left: 16px;
            }

            .nav-right {
                width: 100%;
                justify-content: center;
            }

            .nav-right nav {
                width: 100%;
            }

            .nav-links.active {
                align-items: center;
            }

            .news-grid,
            .members-grid {
                grid-template-columns: minmax(0, 1fr);
            }

            .news-content,
            .popular-education {
                padding: 20px;
            }

            .join-hero,
            .join-panel,
            .join-contact,
            .join-location-heading {
                padding: 24px 20px;
            }

            .join-grid {
                grid-template-columns: minmax(0, 1fr);
            }

            .join-contact,
            .join-location-heading {
                align-items: flex-start;
                flex-direction: column;
                gap: 18px;
            }

            .join-contact .btn {
                width: 100%;
                text-align: center;
                overflow-wrap: anywhere;
            }

            .map-container,
            .map-frame {
                min-height: 300px;
            }

            .map-frame {
                height: 320px;
            }

            .map-meta {
                align-items: flex-start;
                flex-direction: column;
                gap: 8px;
                padding: 14px 16px;
            }

            .research-card {
                padding: 24px 54px 24px 24px;
            }

            .research-card h3 {
                font-size: 1.2rem;
            }
        }