:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #f6ad55;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --gray-color: #718096;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .section-padding {
            padding: 5rem 0;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1586773860418-dc22f8b874bc?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: #9b2c2c;
            border-color: #9b2c2c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary-color);
            position: relative;
            padding-bottom: 1rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .stats-section {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 0.95)), url('https://images.unsplash.com/photo-1542744095-fcf48d80b0fd?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2076&q=80') no-repeat center center/cover;
            color: white;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
        }
        .stat-label {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .contact-info-box {
            background: var(--light-color);
            border-radius: 10px;
            padding: 2rem;
            height: 100%;
            border-left: 5px solid var(--secondary-color);
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 4rem 0 1.5rem;
        }
        .footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: white;
        }
        .copyright {
            border-top: 1px solid #4a5568;
            padding-top: 1.5rem;
            margin-top: 3rem;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background-color: white;
            border-radius: 4px;
            color: var(--primary-color);
            font-weight: 500;
            border: 1px solid #e2e8f0;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .navbar-custom {
            background-color: rgba(26, 54, 93, 0.95);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-custom.scrolled {
            padding: 0.5rem 0;
            background-color: var(--primary-color);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .nav-link-custom {
            color: white !important;
            font-weight: 500;
            margin: 0 0.5rem;
            transition: color 0.3s ease;
        }
        .nav-link-custom:hover {
            color: var(--accent-color) !important;
        }
        .navbar-brand-custom {
            font-size: 1.8rem;
            font-weight: 700;
            color: white !important;
        }
        .mobile-img {
            height: 250px;
            object-fit: cover;
            border-radius: 10px;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
        }