:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }
        .navbar {
            background-color: rgba(44, 62, 80, 0.95);
            padding: 15px 0;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .navbar-nav .nav-link {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
            margin: 0 10px;
            padding: 8px 15px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: white;
            background-color: rgba(52, 152, 219, 0.2);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(44, 62, 80, 0.85), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 25px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }
        .cta-button {
            background-color: var(--secondary-color);
            color: white;
            padding: 14px 35px;
            border-radius: 50px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: var(--transition);
            border: none;
            display: inline-block;
            text-decoration: none;
        }
        .cta-button:hover {
            background-color: #2980b9;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
            color: white;
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 15px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.center {
            text-align: center;
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-subtitle {
            font-size: 1.2rem;
            color: #666;
            margin-bottom: 60px;
            max-width: 700px;
        }
        .service-card {
            background-color: white;
            border-radius: 10px;
            padding: 40px 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            margin-bottom: 30px;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background-color: rgba(52, 152, 219, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            color: var(--secondary-color);
            font-size: 2rem;
        }
        .card-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        .stats-section {
            background-color: var(--primary-color);
            color: white;
            padding: 80px 0;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 10px;
        }
        .stat-title {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .team-card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            margin-bottom: 30px;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .team-img {
            width: 100%;
            height: 280px;
            object-fit: cover;
        }
        .team-info {
            padding: 25px;
        }
        .partner-logo {
            background-color: white;
            padding: 25px;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            height: 120px;
            transition: var(--transition);
            margin-bottom: 30px;
        }
        .partner-logo:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .partner-logo img {
            max-width: 100%;
            max-height: 70px;
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
        }
        .partner-logo:hover img {
            filter: grayscale(0);
            opacity: 1;
        }
        .friendlink {
            background-color: #f1f5f9;
            padding: 80px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            border-radius: 50px;
            margin: 8px 12px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            border: 1px solid #eaeaea;
        }
        .flink:hover {
            background-color: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(52, 152, 219, 0.2);
            border-color: var(--secondary-color);
        }
        .footer {
            background-color: var(--primary-color);
            color: rgba(255, 255, 255, 0.8);
            padding: 70px 0 30px;
        }
        .footer-title {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 25px;
            font-weight: 600;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            display: block;
            margin-bottom: 12px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .footer-contact li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        .footer-contact i {
            width: 30px;
            color: var(--secondary-color);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 25px;
            margin-top: 50px;
            text-align: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
            .section-padding {
                padding: 80px 0;
            }
            .section-title {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.9rem;
            }
            .navbar-nav .nav-link {
                margin: 5px 0;
            }
        }
        @media (max-width: 576px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .hero-title {
                font-size: 1.9rem;
            }
            .cta-button {
                padding: 12px 25px;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-up {
            animation: fadeInUp 0.8s ease forwards;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
            transition: var(--transition);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            transform: translateY(-5px);
        }