@charset "utf-8";
 * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-blue: #1E5AA8;
            --light-blue: #4A90E2;
            --dark-blue: #0D3A6E;
            --accent-blue: #6BB3F8;
            --white: #FFFFFF;
            --light-gray: #F5F7FA;
            --dark-gray: #333333;
            --text-gray: #666666;
            --shadow: 0 4px 20px rgba(30, 90, 168, 0.15);
            --shadow-hover: 0 8px 30px rgba(30, 90, 168, 0.25);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
            line-height: 1.8;
            color: var(--dark-gray);
            background: var(--white);
            overflow-x: hidden;
        }

        /* 首屏视觉区 */
        .hero-section {
            position: relative;
            min-height: 80vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 50%, var(--light-blue) 100%);
            color: var(--white);
            text-align: center;
            padding: 60px 20px;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
            opacity: 0.3;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 1200px;
            width: 100%;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.2);
            padding: 8px 24px;
            border-radius: 50px;
            font-size: 14px;
            margin-bottom: 30px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.3);
            animation: fadeInDown 0.8s ease;
        }

        .hero-title {
            font-size: clamp(28px, 5vw, 52px);
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 24px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
            animation: fadeInUp 0.8s ease 0.2s both;
        }

        .hero-subtitle {
            font-size: clamp(16px, 2.5vw, 20px);
            line-height: 1.8;
            max-width: 900px;
            margin: 0 auto 40px;
            opacity: 0.95;
            animation: fadeInUp 0.8s ease 0.4s both;
        }

        .hero-highlights {
            display: flex;
            justify-content: center;
            gap: 30px;
            flex-wrap: wrap;
            margin-top: 40px;
            animation: fadeInUp 0.8s ease 0.6s both;
        }

        .highlight-item {
            display: flex;
            align-items: center;
            gap: 12px;
            background: rgba(255, 255, 255, 0.15);
            padding: 15px 25px;
            border-radius: 12px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s ease;
        }

        .highlight-item:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-3px);
        }

        .highlight-icon {
            width: 40px;
            height: 40px;
            background: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }

        .highlight-text {
            font-size: 14px;
            text-align: left;
        }

        .highlight-label {
            font-size: 12px;
            opacity: 0.8;
            display: block;
        }

        /* 通用区块样式 */
        .section {
            padding: 80px 20px;
        }

        .section-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-title {
            font-size: clamp(28px, 4vw, 42px);
            color: var(--dark-blue);
            font-weight: 700;
            margin-bottom: 16px;
            position: relative;
            display: inline-block;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .section-title:hover {
            color: var(--primary-blue);
        }

        .section-title a {
            color: inherit;
            text-decoration: none;
        }

        .section-title a:hover {
            color: var(--primary-blue);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
            border-radius: 2px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-gray);
            margin-top: 20px;
        }

        /* 第一部分：授牌盛况 */
        .ceremony-section {
            background: var(--light-gray);
        }

        .ceremony-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .ceremony-text h3 {
            font-size: 28px;
            color: var(--dark-blue);
            margin-bottom: 24px;
        }

        .ceremony-text p {
            font-size: 16px;
            line-height: 2;
            color: var(--text-gray);
            margin-bottom: 20px;
            text-indent: 2em;
        }

        .ceremony-images {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .ceremony-image {
            position: relative;
            height: 300px;
            background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 16px;
        }

        .ceremony-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .image-placeholder {
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(30, 90, 168, 0.15));
            border: 2px dashed rgba(30, 90, 168, 0.3);
            padding: 20px;
            text-align: center;
        }

        .image-placeholder-icon {
            font-size: 48px;
            margin-bottom: 15px;
            opacity: 0.6;
        }

        .image-placeholder-text {
            font-size: 15px;
            color: var(--dark-blue);
            margin-bottom: 8px;
            font-weight: 600;
        }

        .image-placeholder-size {
            font-size: 12px;
            color: var(--text-gray);
            opacity: 0.7;
        }

        .ceremony-image::before {
            content: attr(data-label);
            position: absolute;
            bottom: 15px;
            left: 15px;
            background: rgba(0, 0, 0, 0.7);
            color: var(--white);
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 14px;
            z-index: 1;
        }

        .milestone-list {
            list-style: none;
            margin-top: 20px;
            padding-left: 0;
        }

        .milestone-list li {
            padding: 8px 0;
            padding-left: 24px;
            position: relative;
            font-size: 15px;
            color: var(--text-gray);
        }

        .milestone-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary-blue);
            font-weight: 700;
        }
        	
        /* 第二部分：学术精华 */
        .seminar-section {
            background: var(--white);
        }

        .seminar-overview {
            height: 450px;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 20px;
            margin-bottom: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 24px;
            box-shadow: var(--shadow);
            overflow: hidden;
            position: relative;
        }

        .seminar-overview img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 专家报告照片展示 */
        .speaker-photos {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 40px 0;
        }

        .speaker-photo {
            height: 280px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }

        .speaker-photo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .speaker-info {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
            color: var(--white);
            padding: 30px 15px 15px;
        }

        .speaker-name {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .speaker-topic-text {
            font-size: 12px;
            opacity: 0.9;
        }

        /* 特色专家展示区域 */
        .featured-expert-section {
            margin: 60px 0;
            padding: 40px;
            background: linear-gradient(135deg, #f8fbff, #eef5ff);
            border-radius: 20px;
            box-shadow: var(--shadow);
        }

        .featured-expert-card {
            display: grid;
            grid-template-columns: 300px 1fr;
            gap: 40px;
            align-items: start;
        }

        .featured-expert-photo {
            width: 100%;
            height: 400px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }

        .featured-expert-photo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .featured-expert-info {
            padding: 20px 0;
        }

        .featured-expert-name {
            font-size: 28px;
            color: var(--dark-blue);
            margin-bottom: 10px;
            font-weight: 700;
        }

        .featured-expert-title {
            font-size: 18px;
            color: var(--primary-blue);
            margin-bottom: 20px;
            font-weight: 500;
        }

        .featured-expert-topic {
            background: var(--white);
            padding: 15px 20px;
            border-radius: 12px;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary-blue);
            font-size: 16px;
            line-height: 1.8;
        }

        .featured-expert-intro {
            font-size: 15px;
            line-height: 2;
            color: var(--text-gray);
        }

        .featured-expert-intro p {
            margin-bottom: 12px;
        }

        .expert-cards {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
            margin-bottom: 40px;
        }

        .expert-card {
            background: var(--white);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            border: 1px solid #e8eef5;
            
			padding-bottom: 30px;
			text-align: center;
        }

        .expert-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .expert-photo {
            width: 100%;
            height: 180px;
            background: linear-gradient(135deg, #f8fbff, #eef5ff);
            border-radius: 16px 16px 0 0;
            overflow: hidden;
        }

        .expert-photo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .expert-photo .image-placeholder {
            border-radius: 0;
            border: none;
            background: linear-gradient(135deg, #f8fbff, #eef5ff);
        }

        .expert-photo .image-placeholder-icon {
            font-size: 32px;
            margin-bottom: 8px;
        }

        .expert-photo .image-placeholder-text {
            font-size: 13px;
            margin-bottom: 4px;
        }

        .expert-photo .image-placeholder-size {
            font-size: 11px;
        }

        .expert-card .expert-name,
        .expert-card .expert-title,
        .expert-card .expert-topic {
            padding: 0 20px;
        }

        .expert-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark-blue);
            margin-bottom: 8px;
            padding-top: 20px;
        }

        .expert-title {
            font-size: 14px;
            color: var(--primary-blue);
            margin-bottom: 16px;
        }

        .expert-topic {
            font-size: 15px;
            color: var(--text-gray);
            padding-bottom: 20px;
        }
            line-height: 1.6;
        }

        .hospital-expert {
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            color: var(--white);
            border-radius: 20px;
            padding: 40px;
            margin-top: 40px;
        }

        .hospital-expert h4 {
            font-size: 24px;
            margin-bottom: 20px;
        }

        .hospital-expert p {
            font-size: 16px;
            line-height: 1.8;
            opacity: 0.95;
        }

        /* 最新动态 */
        .news-section {
            background: var(--light-gray);
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .news-item {
            background: var(--white);
            border-radius: 12px;
            padding: 24px;
            display: flex;
            gap: 24px;
            align-items: flex-start;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .news-item:hover {
            transform: translateX(5px);
            box-shadow: var(--shadow-hover);
        }

        .news-date {
            min-width: 100px;
            text-align: center;
        }

        .news-date-day {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1;
        }

        .news-date-month {
            font-size: 14px;
            color: var(--text-gray);
        }

        .news-content h4 {
            font-size: 18px;
            color: var(--dark-gray);
            margin-bottom: 8px;
        }

        .news-content p {
            font-size: 14px;
            color: var(--text-gray);
            line-height: 1.6;
        }

        .news-link {
            color: var(--primary-blue);
            font-size: 14px;
            text-decoration: none;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 5px;
            margin-top: 10px;
        }

        .news-link:hover {
            text-decoration: underline;
        }

        /* 介入科普 */
        .science-section {
            background: var(--white);
        }

        .science-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .science-card {
            background: linear-gradient(135deg, #f8fbff, #eef5ff);
            border-radius: 20px;
            padding: 40px 30px;
            text-align: center;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .science-card:hover {
            border-color: var(--primary-blue);
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }

        .science-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 50%;
            margin: 0 auto 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 40px;
        }

        .science-card h4 {
            font-size: 20px;
            color: var(--dark-blue);
            margin-bottom: 16px;
        }

        .science-card p {
            font-size: 15px;
            color: var(--text-gray);
            line-height: 1.8;
        }

        .science-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid rgba(30, 90, 168, 0.1);
        }

        .science-date {
            font-size: 13px;
            color: var(--text-gray);
            opacity: 0.7;
        }

        .science-link {
            font-size: 14px;
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .science-link:hover {
            color: var(--accent-blue);
            text-decoration: underline;
        }

        /* 医院与科室实力 */
        .hospital-section {
            background: var(--light-gray);
        }

        .hospital-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            margin-bottom: 60px;
        }

        .hospital-text h3 {
            font-size: 28px;
            color: var(--dark-blue);
            margin-bottom: 20px;
        }

        .hospital-text p {
            font-size: 16px;
            line-height: 2;
            color: var(--text-gray);
            margin-bottom: 16px;
            text-indent: 2em;
        }

        .equipment-gallery {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
        }

        .equipment-item {
            height: 180px;
            background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 16px;
            font-weight: 500;
            text-align: center;
            padding: 10px;
            transition: transform 0.3s ease;
            overflow: hidden;
            position: relative;
        }

        .equipment-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            top: 0;
            left: 0;
        }

        .equipment-item .equipment-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
            color: var(--white);
            padding: 30px 10px 10px;
            font-size: 14px;
            font-weight: 600;
        }

        .equipment-item:hover {
            transform: scale(1.05);
        }

        .equipment-icon {
            font-size: 32px;
            margin-bottom: 8px;
        }

        .team-section {
            background: var(--white);
            border-radius: 20px;
            padding: 40px;
            box-shadow: var(--shadow);
        }

        .team-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .team-header h4 {
            font-size: 24px;
            color: var(--dark-blue);
        }

        .team-info {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .team-leader {
            text-align: center;
        }

        .team-photo-large {
            width: 100%;
            height: 300px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--light-gray);
            margin-bottom: 15px;
        }

        .team-photo-large img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .team-leader-avatar {
            width: 120px;
            height: 120px;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 50%;
            margin: 0 auto 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .team-leader-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .team-leader-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark-blue);
            margin-bottom: 8px;
        }

        .team-leader-title {
            font-size: 14px;
            color: var(--text-gray);
        }

        .scope-list {
            background: var(--light-gray);
            padding: 30px;
            border-radius: 16px;
        }

        .scope-list h5 {
            font-size: 18px;
            color: var(--dark-blue);
            margin-bottom: 16px;
        }

        .scope-list ul {
            list-style: none;
        }

        .scope-list li {
            padding: 8px 0;
            padding-left: 24px;
            position: relative;
            font-size: 15px;
            color: var(--text-gray);
        }

        .scope-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary-blue);
            font-weight: 700;
        }

        /* 未来展望 */
        .future-section {
            background: linear-gradient(135deg, var(--dark-blue), var(--primary-blue));
            color: var(--white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .future-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></svg>');
            background-size: 100px;
        }

        .future-content {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
        }

        .future-title {
            font-size: clamp(28px, 4vw, 42px);
            margin-bottom: 30px;
        }

        .future-text {
            font-size: 18px;
            line-height: 2;
            opacity: 0.95;
            margin-bottom: 40px;
        }

        .future-values {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
        }

        .value-item {
            text-align: center;
            background: rgba(255, 255, 255, 0.1);
            padding: 30px 40px;
            border-radius: 16px;
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }

        .value-item:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-5px);
        }

        .value-icon {
            font-size: 40px;
            margin-bottom: 10px;
        }

        .value-label {
            font-size: 16px;
            font-weight: 500;
        }

        /* 页尾功能区 */
        .footer {
            background: var(--dark-gray);
            color: var(--white);
            padding: 60px 20px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-main {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 60px;
            margin-bottom: 40px;
        }

        .footer-booking {
            text-align: center;
        }

        .footer-booking h4 {
            font-size: 20px;
            margin-bottom: 20px;
        }

        .qr-code {
            width: 180px;
            height: 180px;
            background: var(--white);
            border-radius: 12px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--dark-gray);
            font-size: 14px;
            flex-direction: column;
            line-height: 1.6;
        }

        .booking-tip {
            font-size: 14px;
            opacity: 0.9;
            line-height: 1.8;
        }

        .footer-info h4 {
            font-size: 18px;
            margin-bottom: 16px;
        }

        .footer-info p {
            font-size: 14px;
            opacity: 0.8;
            line-height: 1.8;
            margin-bottom: 8px;
        }

        .footer-nav h4 {
            font-size: 18px;
            margin-bottom: 16px;
        }

        .footer-nav a {
            display: block;
            color: var(--white);
            text-decoration: none;
            font-size: 14px;
            opacity: 0.8;
            margin-bottom: 10px;
            transition: opacity 0.3s;
        }

        .footer-nav a:hover {
            opacity: 1;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 13px;
            opacity: 0.6;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .ceremony-content,
            .hospital-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .equipment-gallery {
                grid-template-columns: repeat(3, 1fr);
            }

            .team-info {
                grid-template-columns: 1fr;
            }

            .footer-main {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 60px 15px;
            }

            .hero-highlights {
                flex-direction: column;
                align-items: center;
            }

            .highlight-item {
                width: 100%;
                max-width: 300px;
            }

            .equipment-gallery {
                grid-template-columns: 1fr 1fr;
            }

            .footer-main {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .news-item {
                flex-direction: column;
            }

            .news-date {
                min-width: auto;
                text-align: left;
                display: flex;
                align-items: center;
                gap: 10px;
            }

            .news-date-day {
                font-size: 24px;
            }

            .future-values {
                flex-direction: column;
            }

            .value-item {
                width: 100%;
            }

            .speaker-photos {
                grid-template-columns: 1fr;
            }

            .featured-expert-card {
                grid-template-columns: 1fr;
            }

            .featured-expert-photo {
                height: 350px;
            }

            .team-photo-large {
                height: 250px;
            }
        }

        @media (max-width: 480px) {
            .hero-badge {
                font-size: 12px;
                padding: 6px 16px;
            }

            .ceremony-image {
                height: 200px;
            }

            .seminar-overview {
                height: 250px;
                font-size: 18px;
            }

            .equipment-gallery {
                grid-template-columns: 1fr;
            }
        }

        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-in {
            animation: fadeInUp 0.8s ease forwards;
        }

        /* 滚动平滑 */
        html {
            scroll-behavior: smooth;
        }

        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-blue);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            cursor: pointer;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            opacity: 0;
            visibility: hidden;
            z-index: 1000;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--dark-blue);
            transform: translateY(-3px);
        }

        /* 顶部导航栏 */
        .top-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(13, 58, 110, 0.95);
            backdrop-filter: blur(10px);
            color: var(--white);
            padding: 12px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 1001;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .nav-logo {
            font-size: 16px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-links {
            display: flex;
            gap: 20px;
        }

        .nav-links a {
            color: var(--white);
            text-decoration: none;
            font-size: 14px;
            opacity: 0.9;
            transition: opacity 0.3s;
        }

        .nav-links a:hover {
            opacity: 1;
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
        }

        .hero-section {
            padding-top: 100px;
        }

        /* 响应式布局 */
        @media (max-width: 768px) {
            .photo-grid-3 {
                grid-template-columns: 1fr;
            }
            
            .photo-item-medium {
                height: 280px;
            }
            
            .image-placeholder-text {
                font-size: 14px;
            }
            
            .image-placeholder-size {
                font-size: 11px;
            }
        }