:root {
            --primary-blue: #0066cc;
            --primary-green: #00a859;
            --accent-teal: #20c997;
            --dark-blue: #004085;
            --light-blue: #e6f2ff;
            --light-green: #e6f7ef;
            --gray-bg: #f8f9fa;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-blue);
            font-size: 1.5rem;
        }
        .navbar-brand span {
            color: var(--primary-green);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 68, 133, 0.85), rgba(0, 102, 204, 0.9)), url('https://images.unsplash.com/photo-1559757175-0eb30cd8c063?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0 100px;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-section {
                padding: 80px 0 60px;
            }
        }
        .section-title {
            color: var(--dark-blue);
            font-weight: 700;
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--primary-green);
        }
        .center-title:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            border-radius: 12px;
            border: none;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            background: white;
            overflow: hidden;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--light-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
            color: var(--primary-blue);
        }
        .product-card {
            border: 1px solid #eaeaea;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
        }
        .product-card:hover {
            border-color: var(--accent-teal);
            box-shadow: var(--shadow);
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            width: 100%;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-blue), var(--dark-blue));
            border: none;
            border-radius: 50px;
            padding: 12px 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(0, 102, 204, 0.3);
        }
        .btn-green {
            background: linear-gradient(to right, var(--primary-green), var(--accent-teal));
            border: none;
            border-radius: 50px;
            padding: 12px 30px;
            font-weight: 600;
            color: white;
            transition: var(--transition);
        }
        .btn-green:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(0, 168, 89, 0.3);
            color: white;
        }
        .news-card {
            border-left: 4px solid var(--primary-blue);
            padding-left: 20px;
            margin-bottom: 2rem;
            transition: var(--transition);
        }
        .news-card:hover {
            border-left-color: var(--primary-green);
            padding-left: 25px;
        }
        .contact-info {
            background: var(--gray-bg);
            border-radius: 12px;
            padding: 30px;
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--light-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary-blue);
            margin-bottom: 1rem;
        }
        .footer {
            background: #222;
            color: #ddd;
            padding: 60px 0 20px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer h5:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 2px;
            background: var(--primary-green);
        }
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-teal);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #444;
            padding-top: 20px;
            margin-top: 40px;
            font-size: 0.9rem;
            color: #aaa;
        }
        .friendlink {
            background: var(--gray-bg);
            padding: 40px 0;
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 50px;
            border: 1px solid #ddd;
            color: #555;
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            border-color: var(--primary-blue);
            transform: translateY(-3px);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--light-blue);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--primary-green);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-green);
        }
        .cert-badge {
            display: inline-block;
            background: var(--light-green);
            color: var(--primary-green);
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 0.85rem;
            margin-right: 10px;
            margin-bottom: 10px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-blue);
            line-height: 1;
        }
        .stat-label {
            color: #666;
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .partner-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 15px 0;
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .partner-logo img {
            max-height: 60px;
            max-width: 80%;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-blue);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.2rem;
            box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
            z-index: 1000;
            opacity: 0;
            transition: var(--transition);
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--dark-blue);
            color: white;
            transform: translateY(-5px);
        }
        .navbar-nav .nav-link.active {
            color: var(--primary-blue);
            font-weight: 600;
        }
        .form-control:focus {
            border-color: var(--accent-teal);
            box-shadow: 0 0 0 0.25rem rgba(32, 201, 151, 0.25);
        }
        .modal-header {
            background: linear-gradient(to right, var(--primary-blue), var(--dark-blue));
            color: white;
        }