:root {
            --primary-color: #1a365d;
            --secondary-color: #2d3748;
            --accent-color: #e53e3e;
            --light-bg: #f7fafc;
            --text-dark: #2d3748;
            --text-light: #718096;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1591799264318-7e6ef8ddb7ea?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            position: relative;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--accent-color);
        }
        .section-title.text-start::after {
            left: 0;
            transform: none;
        }
        .card-hover {
            transition: all 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background-color: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 30px;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            background-color: var(--light-bg);
            color: var(--text-dark);
            border-radius: 4px;
            margin: 5px 10px;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        .btn-custom {
            background-color: var(--accent-color);
            color: white;
            padding: 12px 30px;
            border-radius: 4px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
        }
        .btn-custom:hover {
            background-color: #c53030;
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(229, 62, 62, 0.2);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .contact-info {
            background-color: var(--light-bg);
            border-radius: 8px;
            padding: 25px;
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 20px;
            margin-right: 15px;
        }
        .product-image {
            height: 250px;
            object-fit: cover;
            border-radius: 8px 8px 0 0;
        }
        .footer {
            background-color: var(--secondary-color);
            color: white;
            padding: 60px 0 30px;
        }
        .footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .map-container {
            height: 400px;
            border-radius: 8px;
            overflow: hidden;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background-color: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: var(--accent-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .certificate-logo {
            height: 80px;
            object-fit: contain;
            filter: grayscale(100%);
            transition: filter 0.3s ease;
        }
        .certificate-logo:hover {
            filter: grayscale(0);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .contact-info {
                margin-bottom: 30px;
            }
        }