/* ==================== CSS Variables ==================== */
        :root {
            /* Colors - Brand */
            --color-primary: #CD202B;
            --color-primary-light: #E85D6F;
            --color-primary-alpha-10: rgba(205, 32, 43, 0.1);
            --color-primary-alpha-20: rgba(205, 32, 43, 0.2);
            --color-primary-alpha-50: rgba(205, 32, 43, 0.5);

            /* Colors - Background */
            --color-bg-primary: #000000;
            --color-bg-secondary: #0a0a0a;
            --color-bg-tertiary: #1a1a1a;
            --color-bg-card: rgba(255, 255, 255, 0.03);

            /* Colors - Text */
            --color-text-primary: #ffffff;
            --color-text-secondary: #cccccc;
            --color-text-muted: #888888;
            --color-text-light: rgba(255, 255, 255, 0.9);
            --color-text-lighter: rgba(255, 255, 255, 0.85);
            --color-text-dim: #666666;

            /* Colors - Border */
            --color-border-light: rgba(255, 255, 255, 0.1);
            --color-border-medium: rgba(255, 255, 255, 0.2);
            --color-border-primary: var(--color-primary);

            /* Colors - Special */
            --color-success: #018F57;
            --color-tsinghua: #690874;
            --color-hunan: #CD202B;
            --color-jilin: #024BB9;

            /* Typography - Font Size */
            --font-size-xs: 12px;
            --font-size-sm: 14px;
            --font-size-base: 16px;
            --font-size-lg: 18px;
            --font-size-xl: 20px;
            --font-size-2xl: 24px;
            --font-size-3xl: 32px;
            --font-size-4xl: 48px;
            --font-size-5xl: 64px;

            /* Typography - Font Weight */
            --font-weight-normal: 400;
            --font-weight-medium: 500;
            --font-weight-semibold: 600;
            --font-weight-bold: 700;
            --font-weight-black: 900;

            /* Typography - Line Height */
            --line-height-tight: 1.2;
            --line-height-normal: 1.5;
            --line-height-relaxed: 1.6;
            --line-height-loose: 1.8;
            --line-height-extra-loose: 2;

            /* Spacing */
            --spacing-1: 4px;
            --spacing-2: 8px;
            --spacing-3: 12px;
            --spacing-4: 16px;
            --spacing-5: 20px;
            --spacing-6: 24px;
            --spacing-8: 32px;
            --spacing-10: 40px;
            --spacing-12: 48px;
            --spacing-15: 60px;
            --spacing-20: 80px;

            /* Border Radius */
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 15px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --radius-circle: 50%;

            /* Shadows */
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.3);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.8);
            --shadow-primary: 0 10px 30px rgba(205, 32, 43, 0.4);
            --shadow-white: 0 10px 30px rgba(255, 255, 255, 0.3);

            /* Transitions */
            --transition-fast: 0.15s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
        }

        /* ==================== Base Styles ==================== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

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

        /* ==================== Header ==================== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: var(--color-bg-primary);
            padding: var(--spacing-4) var(--spacing-12);
            z-index: 1000;
            border-bottom: 1px solid var(--color-border-light);
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1600px;
            margin: 0 auto;
        }

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

        .logo a {
            display: flex;
            align-items: center;
            text-decoration: none;
            transition: opacity 0.3s;
        }

        .logo a:hover {
            opacity: 0.8;
        }

        .logo img {
            height: 50px;
            width: auto;
        }

        .nav-links {
            display: flex;
            gap: 50px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            color: #ffffff;
            text-decoration: none;
            font-size: 16px;
            font-weight: 400;
            transition: color 0.3s;
            white-space: nowrap;
        }

        .nav-links a:hover {
            color: #CD202B;
        }

        .lang-switch {
            display: flex;
            gap: 5px;
            align-items: center;
        }

        .lang-btn {
            background: transparent;
            border: none;
            color: #ffffff;
            padding: 0;
            cursor: pointer;
            font-size: 16px;
            transition: all 0.3s;
            font-weight: 400;
            width: 52px;
            height: 34px;
            text-align: center;
            line-height: 34px;
            vertical-align: middle;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .lang-btn:hover {
            color: #CD202B;
        }

        .lang-btn.active {
            color: #CD202B;
            font-weight: 400;
        }

        .lang-separator {
            color: #666666;
            font-size: 16px;
            font-weight: 400;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
        }

        /* Hero Section */
        .hero {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            position: relative;
            overflow: hidden;
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7)),
                url('../images/hero-bg-image.png');
            background-size: cover;
            background-position: center;
        }

        .hero-video {
            position: absolute;
            top: 50%;
            left: 50%;
            min-width: 100%;
            min-height: 100%;
            width: auto;
            height: auto;
            transform: translateX(-50%) translateY(-50%);
            z-index: 0;
            object-fit: cover;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.6));
            z-index: 1;
        }

        .hero-content {
            max-width: 1000px;
            padding: 160px 0px 20px;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 72px;
            font-weight: 900;
            margin-bottom: 5px;
            letter-spacing: -2px;
            text-transform: uppercase;
        }

        .hero-logo {
            height: 80px;
            width: auto;
            display: inline-block;
            vertical-align: middle;
        }

        .hero-subtitle {
            font-size: 64px;
            font-weight: 700;
            margin-bottom: 30px;
        }

        .hero-tagline {
            font-size: 40px;
            color: hsla(0, 0%, 100%, 0.5);
            margin-bottom: 20px;
            font-weight: 600;
        }

        .hero-description {
            padding: 20px 40px;
            font-size: 16px;
            margin-bottom: 30px;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.8;
        }

        .hero-date {
            font-size: 24px;
            color: #CD202B;
            margin-bottom: 40px;
            font-weight: 600;
        }

        .hero-stats {
            display: flex;
            gap: 30px;
            justify-content: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .hero-stat-card {
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 10px;
            padding: 20px 30px;
            backdrop-filter: blur(5px);
            background: rgba(0, 0, 0, 0.3);
            min-width: 160px;
            text-align: center;
        }

        .hero-stat-number {
            font-size: 36px;
            font-weight: 700;
        }

        .hero-stat-label {
            font-size: 12px;
            color: #cccccc;
        }

        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            padding: 15px 40px;
            border: none;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
        }

        .btn-primary {
            background: linear-gradient(135deg, #CD202B, #E85D6F);
            color: #ffffff;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(255, 0, 102, 0.4);
        }

        .btn-secondary {
            background: transparent;
            color: #ffffff;
            border: 2px solid #ffffff;
        }

        .btn-secondary:hover {
            background: #ffffff;
            color: #000000;
        }

        .button-container {
            text-align: center;
            margin-top: 40px;
        }

        .hidden {
            display: none;
        }

        /* Section Styles */
        .section {
            padding: 120px 60px;
            max-width: 1440px;
            margin: 0 auto;
        }

        .section-title {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 60px;
            text-align: center;
        }

        .section-subtitle {
            font-size: 20px;
            color: #888888;
            text-align: center;
            margin-bottom: 60px;
            max-width: 1000px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.8;
        }

        /* Stats Section */
        .stats {
            background: #0a0a0a;
            padding: 80px 50px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .stat-item {
            text-align: center;
            padding: 30px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .stat-number {
            font-size: 56px;
            font-weight: 900;
            color: #CD202B;
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 16px;
            color: #cccccc;
        }

        /* Records Section */
        .records-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 40px;
            margin-top: 60px;
        }

        .record-card {
            background: linear-gradient(135deg, rgba(255, 0, 102, 0.1), rgba(255, 107, 157, 0.05));
            padding: 40px;
            border-radius: 20px;
            border: 1px solid rgba(255, 0, 102, 0.3);
        }

        .record-card h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #ffffff;
        }

        .record-time {
            font-size: 48px;
            font-weight: 900;
            margin-bottom: 15px;
        }

        .record-team {
            font-size: 18px;
            color: #cccccc;
            margin-bottom: 10px;
        }

        .record-year {
            font-size: 16px;
            color: #888888;
        }

        /* Mission Section */
        .mission-section {
            position: relative;
            background-image: url('../images/mission-bg-image.jpg');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            padding: 120px 60px;
            max-width: 100%;
            margin: 0;
            width: 100%;
        }

        .mission-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom,
                    rgba(0, 0, 0, 0.85) 0%,
                    rgba(0, 0, 0, 0.75) 50%,
                    rgba(0, 0, 0, 0.85) 100%);
            z-index: 1;
        }

        .mission-section .section-title,
        .mission-section .section-subtitle,
        .mission-section .mission-grid {
            position: relative;
            z-index: 2;
            max-width: 1400px;
            margin-left: auto;
            margin-right: auto;
        }

        .mission-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }

        .mission-card {
            background: rgba(255, 255, 255, 0.03);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: transform 0.3s, border-color 0.3s;
        }

        .mission-card:hover {
            transform: translateY(-5px);
            border-color: #CD202B;
        }

        .mission-card h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #ffffff;
        }

        .mission-card p {
            color: #cccccc;
            line-height: 1.8;
        }

        /* Impact Section */
        .impact {
            background: #0a0a0a;
        }

        .impact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }

        .impact-item {
            text-align: center;
        }

        .impact-number {
            font-size: 64px;
            font-weight: 900;
            background: linear-gradient(135deg, #CD202B, #E85D6F);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 15px;
        }

        .impact-label {
            font-size: 16px;
            color: #cccccc;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .impact-sublabel {
            font-size: 13px;
            color: #888888;
            line-height: 1.5;
        }

        .media-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }

        .media-stat {
            background: rgba(255, 255, 255, 0.03);
            padding: 30px;
            border-radius: 15px;
            text-align: center;
        }

        .media-stat strong {
            display: block;
            color: #ffffff;
            margin-bottom: 10px;
            font-size: 18px;
        }

        .media-stat p {
            color: #888888;
            font-size: 14px;
        }


        /* Track Modal */
        .track-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.9);
            z-index: 10000;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.3s ease;
        }

        .track-modal.active {
            display: flex;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        .track-modal-content {
            position: relative;
            background: #1a1a1a;
            border-radius: 20px;
            max-width: 90%;
            max-height: 90%;
            overflow: hidden;
            animation: slideUp 0.3s ease;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
        }

        @keyframes slideUp {
            from {
                transform: translateY(50px);
                opacity: 0;
            }

            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .track-modal-close {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #ffffff;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 28px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            z-index: 10;
            line-height: 1;
        }

        .track-modal-close:hover {
            background: #CD202B;
            transform: rotate(90deg);
        }

        .track-modal-body {
            padding: 40px;
        }

        .track-modal-body h3 {
            color: #ffffff;
            font-size: 28px;
            margin-bottom: 30px;
            text-align: center;
        }

        .track-modal-body img {
            width: 100%;
            height: auto;
            max-width: 1200px;
            border-radius: 10px;
            display: block;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .track-modal-content {
                max-width: 95%;
                max-height: 95%;
            }

            .track-modal-body {
                padding: 30px 20px;
            }

            .track-modal-body h3 {
                font-size: 22px;
                margin-bottom: 20px;
            }

            .track-modal-close {
                top: 10px;
                right: 10px;
                width: 35px;
                height: 35px;
                font-size: 24px;
            }
        }

        /* Team Modal */
        .team-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.9);
            z-index: 10000;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.3s ease;
            overflow-y: auto;
        }

        .team-modal.active {
            display: flex;
        }

        .team-modal-content {
            position: relative;
            background: #1a1a1a;
            border-radius: 20px;
            max-width: 800px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
            animation: slideUp 0.3s ease;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
            margin: 20px;
        }

        .team-modal-close {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #ffffff;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 28px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            z-index: 10;
            line-height: 1;
        }

        .team-modal-close:hover {
            background: #CD202B;
            transform: rotate(90deg);
        }

        .team-modal-body {
            padding: 40px;
        }

        .team-modal-university {
            color: #ffffff;
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 10px;
            text-align: center;
        }

        .team-modal-team-name {
            color: #ffffff;
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 30px;
            text-align: center;
        }

        .team-modal-section {
            margin-bottom: 30px;
        }

        .team-modal-section-title {
            color: #ffffff;
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid rgba(255, 255, 255, 0.2);
        }

        .team-modal-description {
            color: #cccccc;
            font-size: 16px;
            line-height: 1.8;
            text-align: justify;
        }

        .team-modal-professors {
            display: grid;
            grid-template-columns: 1fr;
            gap: 25px;
        }

        .team-modal-professor {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 20px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            transition: all 0.3s;
        }

        .team-modal-professor:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateX(5px);
        }

        .professor-avatar {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
        }

        .professor-info {
            flex: 1;
        }

        .professor-name {
            color: #ffffff;
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .professor-bio {
            color: #cccccc;
            font-size: 16px;
            line-height: 1.8;
        }

        @media (max-width: 768px) {
            .team-modal-content {
                max-width: 95%;
                width: 95%;
                margin: 10px;
            }

            .team-modal-body {
                padding: 30px 20px;
            }

            .team-modal-university {
                font-size: 24px;
            }

            .team-modal-team-name {
                font-size: 18px;
            }

            .team-modal-section-title {
                font-size: 18px;
            }

            .team-modal-description {
                font-size: 14px;
            }

            .team-modal-professors {
                gap: 20px;
            }

            .team-modal-professor {
                flex-direction: column;
                align-items: center;
                text-align: center;
                padding: 15px;
            }

            .professor-avatar {
                width: 100px;
                height: 100px;
            }

            .professor-name {
                font-size: 18px;
            }

            .professor-bio {
                font-size: 14px;
            }

            .team-modal-close {
                top: 10px;
                right: 10px;
                width: 35px;
                height: 35px;
                font-size: 24px;
            }
        }

        /* No Data Message */
        .no-data {
            text-align: center;
            padding: 60px 20px;
            color: #666;
            font-size: 18px;
            font-weight: 500;
            letter-spacing: 2px;
            text-transform: uppercase;
            grid-column: 1 / -1;
            width: 100%;
            background: rgba(255, 255, 255, 0.02);
            border: 1px dashed rgba(255, 255, 255, 0.1);
            border-radius: 10px;
        }

        .leaderboard-table .no-data {
            padding: 40px 20px;
            background: transparent;
            border: none;
        }

        /* Timeline Section */
        .timeline {
            background: linear-gradient(180deg, #0a0a0a, #000000);
        }

        .timeline-items {
            max-width: 1000px;
            margin: 60px auto 0;
        }

        .timeline-item {
            display: flex;
            gap: 30px;
            margin-bottom: 30px;
            padding: 30px;
            padding-left: 40px;
            background: rgba(255, 255, 255, 0.03);
            position: relative;
            transition: all 0.3s;
            cursor: pointer;
            border: 1px solid rgba(255, 255, 255, 0.1);
            overflow: hidden;
            min-height: 180px;
            align-items: center;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 8px;
            background: #CD202B;
            transition: all 0.3s;
        }

        .timeline-item:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }

        .timeline-item:hover::before {
            width: 12px;
        }

        .timeline-item.completed::before {
            background: #018F57;
        }

        .timeline-item.upcoming::before {
            background: #CD202B;
        }

        .timeline-date {
            font-size: 16px;
            font-weight: 700;
            color: #CD202B;
            width: 200px;
            min-width: 200px;
            max-width: 200px;
            word-wrap: break-word;
            line-height: 1.5;
        }

        .timeline-item.completed .timeline-date {
            color: #4CAF50;
        }

        .timeline-content {
            flex: 1;
        }

        .timeline-content h4 {
            font-size: 22px;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .timeline-content p {
            color: #888888;
            font-size: 15px;
        }

        .timeline-status {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            right: 35px;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }

        .completed-badge {
            background: rgba(76, 175, 80, 0.2);
            color: #4CAF50;
            border: 1px solid #4CAF50;
        }

        .upcoming-badge {
            background: rgba(205, 32, 43, 0.2);
            color: #CD202B;
            border: 1px solid #CD202B;
        }

        .track-preview {
            display: none;
        }

        @media (max-width: 768px) {
            .timeline-item {
                flex-direction: column;
                padding: 20px;
                padding-left: 30px;
                min-height: 220px;
                align-items: flex-start;
            }

            .timeline-item::before {
                width: 6px;
            }

            .timeline-item:hover::before {
                width: 10px;
            }

            .timeline-date {
                width: 100%;
                max-width: 100%;
                min-width: auto;
                margin-bottom: 15px;
            }

            .timeline-status {
                position: relative;
                top: auto;
                right: auto;
                transform: none;
                margin-top: 15px;
                display: inline-block;
            }

            .track-preview {
                max-width: 100%;
            }
        }

        /* Track Section */
        .track {
            background: #000000;
            position: relative;
            min-height: 600px;
        }

        .track::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.7));
            z-index: 1;
        }

        .track .section {
            position: relative;
            z-index: 2;
        }

        .track-content {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 60px;
            margin-top: 60px;
            align-items: start;
        }

        .track-specs-list {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 30px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .track-spec-item {
            display: flex;
            gap: 15px;
            align-items: flex-start;
            padding-bottom: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .track-spec-item:last-child {
            padding-bottom: 0;
            border-bottom: none;
        }

        .spec-icon {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
            object-fit: contain;
        }

        .spec-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .spec-label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        .spec-value {
            font-size: 22px;
            color: #ffffff;
            font-weight: 700;
            line-height: 1.2;
        }

        .track-image-container {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .track-image {
            width: 100%;
            height: auto;
            display: block;
        }

        .track-image-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
            padding: 40px 30px 30px;
            color: #ffffff;
        }

        .track-image-caption h4 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #ffffff;
        }

        .track-image-caption p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
            margin: 0;
        }

        /* Teams Section */
        .teams {
            background: #0a0a0a;
        }

        .teams-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 60px;
        }

        .team-card {
            background: rgba(255, 255, 255, 0.05);
            padding: 30px 20px 25px;
            border-radius: 15px;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }

        .team-card:hover {
            background: rgba(255, 0, 102, 0.1);
            border-color: #CD202B;
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(205, 32, 43, 0.3);
        }

        .team-logo {
            width: 100%;
            max-width: 100px;
            height: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 5px;
        }

        .team-logo img {
            max-width: 100%;
            max-height: 100%;
            width: auto;
            height: auto;
            object-fit: contain;
            filter: brightness(1) contrast(1.1);
            transition: all 0.3s;
        }

        .team-card:hover .team-logo img {
            filter: brightness(1.2) contrast(1.2);
            transform: scale(1.05);
        }

        .team-name {
            font-size: 20px;
            font-weight: 600;
            line-height: 1.4;
        }

        /* Leaderboard Section */
        .leaderboard {
            background: linear-gradient(180deg, #0a0a0a, #000000);
        }

        .leaderboard-table {
            width: 100%;
            margin-top: 60px;
            border-collapse: collapse;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 20px;
            overflow: hidden;
        }

        .leaderboard-table thead {
            background: rgba(80, 80, 100, 0.3);
        }

        .leaderboard-table th {
            padding: 20px;
            text-align: left;
            font-weight: 700;
            color: #ffffff;
            font-size: 16px;
        }

        .leaderboard-table td {
            padding: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .leaderboard-table tr:hover {
            background: rgba(255, 255, 255, 0.05);
        }

        .rank-1 {
            background: linear-gradient(90deg, rgba(105, 8, 116, 0.2), transparent);
        }

        .rank-2 {
            background: linear-gradient(90deg, rgba(205, 32, 43, 0.2), transparent);
        }

        .rank-3 {
            background: linear-gradient(90deg, rgba(2, 75, 185, 0.2), transparent);
        }

        /* Call to Action Section */
        .cta-section {
            background: #000000;
            position: relative;
            overflow: hidden;
            padding: 60px 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .cta-car-image {
            width: 100%;
            max-width: 1400px;
            height: auto;
            display: block;
            margin: 0 auto;
        }

        .cta-content {
            max-width: 1000px;
            margin: -200px auto 0;
            text-align: center;
            padding: 0 40px 60px;
            width: 100%;
            position: relative;
            z-index: 2;
        }

        .cta-description {
            font-size: 28px;
            line-height: 1.5;
            color: #ffffff;
            margin-bottom: 30px;
            font-weight: 500;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.8);
        }

        .cta-question {
            font-size: 24px;
            color: rgba(255, 255, 255, 0.95);
            margin-bottom: 40px;
            font-weight: 400;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.8);
        }

        .cta-button {
            display: inline-block;
            padding: 20px 60px;
            background: transparent;
            color: #ffffff;
            font-size: 20px;
            font-weight: 600;
            text-decoration: none;
            border: 2px solid #ffffff;
            border-radius: 50px;
            transition: all 0.3s;
            letter-spacing: 1px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }

        .cta-button:hover {
            background: #ffffff;
            color: #000000;
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(255, 255, 255, 0.3);
            text-shadow: none;
        }

        /* Partners Section */
        .partners {
            background: #000000;
            padding: 80px 50px;
        }

        .partners>.section-title {
            max-width: 1400px;
            margin: 0 auto 60px auto;
        }

        .partners-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: center;
            align-items: center;
            margin-top: 60px;
        }

        .partner-logo {
            background: rgba(255, 255, 255, 0.05);
            padding: 30px;
            border-radius: 15px;
            min-width: 150px;
            height: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #888888;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .partners-category {
            margin: 60px auto;
            max-width: 1400px;
        }

        .partners-subtitle {
            color: #ffffff;
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid rgba(220, 20, 60, 0.5);
            text-align: left;
        }

        .partners-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 25px;
        }

        .partners-list li {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 30px 20px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 15px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            min-height: 120px;
        }

        .partner-logo-img {
            width: 100%;
            max-width: 150px;
            height: auto;
            max-height: 40px;
            object-fit: contain;
            margin-bottom: 0;
            filter: grayscale(100%) brightness(1.5);
            opacity: 0.8;
        }

        .partner-name {
            display: none;
        }

        @media (max-width: 768px) {
            .partners-category {
                margin: 40px 0;
            }

            .partners-subtitle {
                font-size: 20px;
            }

            .partners-list {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .partners-list li {
                font-size: 14px;
                padding: 12px 15px;
            }
        }

        /* Contact Section */
        .contact {
            background: #000000;
            padding: 80px 50px;
            text-align: center;
        }

        .contact>* {
            max-width: 1400px;
            margin-left: auto;
            margin-right: auto;
        }

        .contact .section-title {
            text-align: center;
            margin-bottom: 40px;
        }

        .contact-info {
            max-width: 1400px;
            margin: 0 auto 60px auto;
            text-align: center;
        }

        .contact-item {
            margin: 20px 0;
            font-size: 16px;
            color: #ffffff;
        }

        .contact-item a {
            color: #ffffff;
            text-decoration: none;
            transition: color 0.3s;
        }

        .contact-item a:hover {
            color: #CD202B;
            text-decoration: underline;
        }

        /* Footer */
        .footer {
            background: #000000;
            padding: 40px 50px;
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer p {
            color: #666666;
            font-size: 14px;
        }

        .contact .social-links {
            display: flex;
            gap: 15px;
            justify-content: center;
            margin: 40px auto 0 auto;
            max-width: 1400px;
            flex-wrap: wrap;
        }

        .contact .social-link {
            width: 48px;
            height: 48px;
            background: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            transition: all 0.3s ease;
            overflow: hidden;
        }

        .contact .social-link img {
            width: 28px;
            height: 28px;
            object-fit: contain;
        }

        .contact .social-link:hover {
            background: #CD202B;
            transform: scale(1.1);
        }

        @media (max-width: 768px) {
            .contact {
                padding: 60px 30px;
            }

            .contact .social-links {
                justify-content: center;
            }

            .partners {
                padding: 60px 30px;
            }
        }



        .media-card-hidden {
            display: none;
        }

        .media-card-hidden.show {
            display: flex;
        }


        /* 2025 Highlights Gallery Section */
        .highlights-section {
            background: #0a0a0a;
        }

        .highlights-gallery {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 25px;
            margin-top: 60px;
        }

        .gallery-item {
            position: relative;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 15px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s;
            cursor: pointer;
        }

        .gallery-item:hover {
            transform: translateY(-5px);
            border-color: #CD202B;
            box-shadow: 0 10px 30px rgba(205, 32, 43, 0.3);
        }

        .gallery-thumbnail {
            position: relative;
            width: 100%;
            padding-bottom: 56.25%;
            /* 16:9 aspect ratio */
            background-size: cover;
            background-position: center;
            overflow: hidden;
        }

        .gallery-play-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(205, 32, 43, 0.9);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            z-index: 1;
        }

        .gallery-item:hover .gallery-play-icon {
            background: #CD202B;
            transform: translate(-50%, -50%) scale(1.1);
        }

        .gallery-play-icon::after {
            content: '';
            width: 0;
            height: 0;
            border-left: 20px solid #ffffff;
            border-top: 12px solid transparent;
            border-bottom: 12px solid transparent;
            margin-left: 4px;
        }

        .gallery-info {
            padding: 20px;
        }

        .gallery-title {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            color: #ffffff;
        }

        /* Lightbox Modal */
        .highlight-lightbox {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.95);
            z-index: 10000;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.3s ease;
            overflow-y: auto;
        }

        .highlight-lightbox.active {
            display: flex;
        }

        .lightbox-close {
            position: fixed;
            top: 30px;
            right: 30px;
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #ffffff;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            font-size: 32px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            z-index: 10001;
            line-height: 1;
        }

        .lightbox-close:hover {
            background: #CD202B;
            transform: rotate(90deg);
        }

        .lightbox-content {
            position: relative;
            max-width: 1200px;
            width: 90%;
            max-height: 90vh;
            background: #1a1a1a;
            border-radius: 20px;
            overflow: hidden;
            animation: slideUp 0.3s ease;
            margin: 40px 20px;
        }

        .lightbox-media {
            width: 100%;
            background: #000000;
        }

        .lightbox-media img {
            width: 100%;
            height: auto;
            display: block;
        }

        .lightbox-media iframe {
            width: 100%;
            aspect-ratio: 16 / 9;
            border: none;
        }

        .lightbox-info {
            padding: 30px;
        }

        .lightbox-title {
            font-size: 24px;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 15px;
        }

        .lightbox-description {
            font-size: 16px;
            line-height: 1.8;
            color: #cccccc;
        }

        @media (max-width: 768px) {
            .highlights-gallery {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .lightbox-content {
                width: 95%;
                margin: 20px 10px;
            }

            .lightbox-close {
                top: 15px;
                right: 15px;
                width: 40px;
                height: 40px;
                font-size: 28px;
            }

            .lightbox-info {
                padding: 20px;
            }

            .lightbox-title {
                font-size: 20px;
            }

            .lightbox-description {
                font-size: 14px;
            }
        }

        /* Media Coverage Section */
        .media-coverage {
            background: #000000;
            padding: 100px 50px;
        }

        .media-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 60px;
        }

        .media-card {
            background: rgba(255, 255, 255, 0.03);
            border-radius: 15px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s;
            display: flex;
            flex-direction: column;
        }

        .media-card:hover {
            transform: translateY(-5px);
            border-color: #CD202B;
            box-shadow: 0 10px 30px rgba(205, 32, 43, 0.3);
        }

        /* 可点击的媒体卡片样式 */
        .media-card-clickable {
            cursor: pointer;
        }

        .media-card-clickable:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(205, 32, 43, 0.4);
        }

        .media-card-clickable:active {
            transform: translateY(-6px);
        }

        .media-card-large {
            grid-column: span 2;
        }

        .media-image {
            width: 100%;
            height: 200px;
            background-size: cover;
            background-position: center;
        }

        .media-card-large .media-image {
            height: 300px;
        }

        .media-content {
            padding: 25px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .media-date {
            font-size: 12px;
            color: #888888;
            margin-bottom: 10px;
        }

        .media-title {
            font-size: 18px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 15px;
            flex: 1;
        }

        .media-card-large .media-title {
            font-size: 22px;
        }

        .media-source {
            font-size: 14px;
            color: #CD202B;
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .media-coverage {
                padding: 60px 20px;
            }

            .media-grid {
                grid-template-columns: 1fr;
            }

            .media-card-large {
                grid-column: span 1;
            }

            .media-card-large .media-image {
                height: 200px;
            }
        }

        /* Responsive Design */

        @media (max-width: 768px) {
            .header {
                padding: 15px 20px;
            }

            .nav-links {
                display: none;
            }

            .hero h1 {
                font-size: 42px;
            }

            .hero-logo {
                height: 50px;
            }

            .hero-subtitle {
                font-size: 40px;
            }

            .hero-tagline {
                color: hsla(0, 0%, 100%, 0.5);
                font-size: 24px;
            }

            /* Hide hero stats on mobile */
            .hero-stats {
                display: none !important;
            }

            /* Fix hero content padding on mobile */
            .hero-content {
                padding: 120px 0px 20px;
            }

            .hero-description {
                padding: 20px 40px;
                font-size: 13px;
                margin-bottom: 20px;
                margin-left: 0;
                margin-right: 0;
                line-height: 1.6;
                max-width: 100%;
            }

            /* Impact Section Mobile */
            .impact-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .impact-number {
                font-size: 48px;
            }

            .impact-label {
                font-size: 15px;
            }

            .impact-sublabel {
                font-size: 12px;
            }

            /* Mission Section Mobile */
            .mission-section {
                padding: 60px 20px;
            }

            .section {
                padding: 60px 20px;
            }

            .section-title {
                font-size: 32px;
            }

            .section-subtitle {
                font-size: 17px;
                max-width: 100%;
                padding: 0 10px;
            }

            .records-grid {
                grid-template-columns: 1fr;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .cta-buttons .btn {
                width: auto;
                min-width: 200px;
            }

            .leaderboard-table {
                font-size: 13px;
            }

            .leaderboard-table th,
            .leaderboard-table td {
                padding: 10px 8px;
                font-size: 13px;
            }

            .track-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .track-specs-list {
                padding: 20px;
                gap: 15px;
            }

            .track-spec-item {
                padding-bottom: 15px;
                gap: 12px;
            }

            .spec-icon {
                width: 28px;
                height: 28px;
            }

            .spec-label {
                font-size: 12px;
            }

            .spec-value {
                font-size: 18px;
            }

            .track-image-caption {
                padding: 30px 20px 20px;
            }

            .cta-section {
                padding: 40px 0px;
            }

            .cta-car-image {
                max-width: 100%;
                width: 100%;
                height: 400px;
                object-fit: cover;
                object-position: center;
            }

            .cta-content {
                margin-top: -80px;
                max-width: 100%;
                padding: 0 20px 40px;
            }

            .cta-description {
                font-size: 20px;
                line-height: 1.4;
                margin-bottom: 20px;
            }

            .cta-question {
                font-size: 18px;
                margin-bottom: 25px;
            }

            .cta-button {
                padding: 16px 40px;
                font-size: 17px;
            }

            .track-image-caption h4 {
                font-size: 18px;
            }

            .track-image-caption p {
                font-size: 13px;
            }
        }

        /* Extra small devices (iPhone SE, etc.) */
        @media (max-width: 375px) {
            .hero-content {
                padding: 120px 0px 20px;
            }

            .hero-description {
                padding: 20px 40px;
                font-size: 12px;
                margin-left: 0;
                margin-right: 0;
                line-height: 1.5;
            }

            .hero-subtitle {
                font-size: 36px;
            }

            .hero-tagline {
                color: hsla(0, 0%, 100%, 0.5);
                font-size: 20px;
            }
        }

        /* Smooth Scroll */
        html {
            scroll-behavior: smooth;
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

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