:root {
            --primary-color: #2c5aa0;
            --secondary-color: #f8b739;
            --dark-color: #1a365d;
            --light-color: #f8f9fa;
            --text-color: #333;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--text-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            background-color: var(--primary-color);
            color: white !important;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(44, 90, 160, 0.9) 0%, rgba(26, 54, 93, 0.95) 100%), url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0 6rem;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 2.5rem;
            opacity: 0.95;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: var(--dark-color);
            font-weight: 700;
            padding: 0.8rem 2.5rem;
            border-radius: 50px;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: #e6a323;
            border-color: #e6a323;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
        }
        .section-padding {
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 1.5rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .feature-card {
            border-radius: 12px;
            overflow: hidden;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.4s ease;
            height: 100%;
            border: none;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .service-item {
            padding: 2.5rem;
            border-radius: 12px;
            background: white;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            height: 100%;
            border-left: 5px solid var(--primary-color);
        }
        .service-item:hover {
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            border-left-color: var(--secondary-color);
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid white;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .testimonial-card {
            background: white;
            border-radius: 15px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            height: 100%;
            position: relative;
        }
        .testimonial-card:before {
            content: "\201C";
            font-size: 6rem;
            color: rgba(44, 90, 160, 0.1);
            position: absolute;
            top: -20px;
            left: 20px;
            font-family: Georgia, serif;
        }
        .flink {
            display: inline-block;
            padding: 0.8rem 1.8rem;
            margin: 0.5rem;
            background: white;
            border-radius: 8px;
            color: var(--dark-color);
            font-weight: 600;
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(44, 90, 160, 0.2);
        }
        .footer {
            background-color: var(--dark-color);
            color: #ccc;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            font-size: 0.9rem;
            color: #aaa;
        }
        .contact-info li {
            margin-bottom: 1rem;
            padding-left: 2rem;
            position: relative;
        }
        .contact-info li i {
            position: absolute;
            left: 0;
            top: 0.3rem;
            color: var(--secondary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: var(--dark-color);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
            .navbar-nav {
                background: white;
                padding: 1rem;
                border-radius: 10px;
                margin-top: 1rem;
                box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            }
        }