:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --accent-color: #ff6b35;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --text-dark: #333;
            --text-light: #666;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1.5rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            color: var(--dark-color) !important;
            position: relative;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            transition: var(--transition);
        }
        .nav-link:hover:after,
        .nav-link.active:after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 179, 0.85), rgba(23, 162, 184, 0.85)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .hero-section p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2rem;
            opacity: 0.9;
        }
        .btn-primary {
            background: var(--primary-color);
            border: none;
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 4px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 86, 179, 0.2);
        }
        .btn-outline-light {
            border: 2px solid white;
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 4px;
            transition: var(--transition);
        }
        .btn-outline-light:hover {
            background: white;
            color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 255, 255, 0.2);
        }
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 2.5rem 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: var(--transition);
            border: 1px solid #f0f0f0;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 86, 179, 0.1);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            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: 2rem;
        }
        .about-section {
            padding: 6rem 0;
            background: var(--light-color);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: var(--transition);
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 86, 179, 0.1);
        }
        .service-img {
            height: 200px;
            background-size: cover;
            background-position: center;
        }
        .service-content {
            padding: 2rem;
        }
        .case-study {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            height: 300px;
            margin-bottom: 2rem;
        }
        .case-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 2rem;
            color: white;
            transition: var(--transition);
        }
        .case-study:hover .case-overlay {
            background: linear-gradient(to top, rgba(0, 86, 179, 0.9), transparent);
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid #f0f0f0;
            transition: var(--transition);
        }
        .team-member:hover .team-img {
            border-color: var(--primary-color);
            transform: scale(1.05);
        }
        .news-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 86, 179, 0.1);
        }
        .news-date {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .contact-info {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 10px;
            padding: 3rem;
            height: 100%;
        }
        .contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 2rem;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1.5rem;
            font-size: 1.3rem;
        }
        .friendlink {
            background: var(--light-color);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 1rem 2rem;
            margin: 0.5rem;
            border-radius: 6px;
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #e0e0e0;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.2);
        }
        footer {
            background: var(--dark-color);
            color: #aaa;
            padding: 4rem 0 2rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #444;
            padding-top: 2rem;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .contact-info {
                margin-bottom: 2rem;
            }
            .navbar-nav {
                text-align: center;
                padding-top: 1rem;
            }
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .stat-card {
            text-align: center;
            padding: 2rem;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline:after {
            content: '';
            position: absolute;
            width: 6px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .timeline-item:after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background: var(--primary-color);
            border: 4px solid white;
            border-radius: 50%;
            top: 15px;
            right: -10px;
            z-index: 1;
        }
        .timeline-item:nth-child(even):after {
            left: -10px;
        }
        @media (max-width: 768px) {
            .timeline:after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:after {
                left: 21px;
            }
            .timeline-item:nth-child(even):after {
                left: 21px;
            }
        }