:root {
            --primary-color: #1a365d;
            --secondary-color: #2d6bc9;
            --accent-color: #00b894;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 10px 25px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .navbar {
            padding: 15px 0;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding: 10px 0;
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .hero-section {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 120px 0 80px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80') center/cover no-repeat;
            opacity: 0.7;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: white;
            font-size: 1.8rem;
        }
        .service-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-img {
            height: 200px;
            width: 100%;
            object-fit: cover;
        }
        .service-content {
            padding: 25px;
        }
        .team-card {
            text-align: center;
            padding: 30px 20px;
            border-radius: 10px;
            background: white;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 20px;
            border: 5px solid #f1f1f1;
        }
        .stat-card {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 30px;
            border-radius: 10px;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 10px;
            display: block;
        }
        .contact-info {
            padding: 25px;
            background: white;
            border-radius: 10px;
            box-shadow: var(--shadow);
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: #f1f9ff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--secondary-color);
            font-size: 1.5rem;
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 70px 0 20px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            font-size: 0.9rem;
            color: #aaa;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 8px 20px;
            margin: 5px;
            border-radius: 5px;
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .flink:hover {
            background: rgba(255,255,255,0.2);
            color: white;
            transform: translateY(-3px);
        }
        .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;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section::before {
                width: 100%;
                opacity: 0.3;
            }
            .hero-section {
                padding: 100px 0 60px;
            }
            .section-title {
                margin-bottom: 2rem;
            }
        }