:root {
            --primary-color: #1a5f7a;
            --secondary-color: #57cc99;
            --accent-color: #ff9a3c;
            --dark-color: #2d3047;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            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-top: 0.8rem;
            padding-bottom: 0.8rem;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            color: var(--primary-color) !important;
            font-size: 1.8rem;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            padding: 0.5rem 1.2rem !important;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
            background-color: rgba(26, 95, 122, 0.05);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(45, 48, 71, 0.9)), url('https://images.unsplash.com/photo-1603561596112-0a132b757442?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 10rem 0;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.4s ease;
            border: 1px solid #eee;
            text-align: center;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border-color: var(--secondary-color);
        }
        .service-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: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .stats-section {
            background-color: var(--primary-color);
            color: white;
            padding: 5rem 0;
        }
        .stat-item h3 {
            color: white;
            font-size: 3rem;
            font-weight: 800;
        }
        .process-step {
            position: relative;
            padding: 2rem;
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            margin-bottom: 2rem;
            text-align: center;
            border-left: 5px solid var(--secondary-color);
        }
        .process-step .step-number {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            border-top: 5px solid var(--primary-color);
        }
        .client-logo {
            height: 60px;
            object-fit: contain;
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            color: var(--dark-color);
            text-decoration: none;
            border: 1px solid #eaeaea;
            transition: all 0.3s;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 95, 122, 0.2);
            border-color: var(--primary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.85);
            padding-top: 4rem;
        }
        footer a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            color: white;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 95, 122, 0.3);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-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;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }
        .article-content {
            font-size: 1.1rem;
            line-height: 1.9;
        }
        .article-content h3 {
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .article-content p {
            margin-bottom: 1.5rem;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 1.5rem;
        }
        .contact-info-item i {
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }