:root {
            --primary-color: #1a3a8f;
            --secondary-color: #00a0e9;
            --accent-color: #ff6b35;
            --dark-color: #0d1b3e;
            --light-color: #f8f9fa;
            --text-color: #333;
            --text-light: #666;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', 'PingFang SC', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem;
            transition: all 0.3s ease;
        }
        .navbar-nav .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(13, 27, 62, 0.85), rgba(13, 27, 62, 0.9)), url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0 80px;
            position: relative;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: #0088cc;
            border-color: #0088cc;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 160, 233, 0.2);
        }
        .btn-outline-custom {
            border: 2px solid white;
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-outline-custom:hover {
            background-color: white;
            color: var(--dark-color);
            transform: translateY(-3px);
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .service-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .team-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }
        .team-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .news-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }
        .news-img {
            height: 200px;
            object-fit: cover;
            width: 100%;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            font-size: 1.1rem;
            color: var(--text-light);
            font-weight: 600;
        }
        .contact-info {
            background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
            color: white;
            border-radius: 12px;
            padding: 3rem;
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: white;
            font-size: 1.2rem;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 4rem 0 1rem;
        }
        .footer-links li {
            margin-bottom: 0.5rem;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-icons a {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            margin-right: 10px;
            transition: all 0.3s ease;
        }
        .social-icons a:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            color: #aaa;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: var(--light-color);
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            margin: 0.5rem;
            color: var(--text-color);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 1px solid #ddd;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--secondary-color);
        }
        .sticky-top {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .navbar-nav {
                padding: 1rem 0;
            }
        }
        .chart-container {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            border: 1px solid #eee;
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.3rem;
            top: 5px;
            width: 16px;
            height: 16px;
            background: var(--secondary-color);
            border-radius: 50%;
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }