:root {
            --primary-color: #0056b3;
            --secondary-color: #f8f9fa;
            --accent-color: #28a745;
            --dark-color: #212529;
            --light-color: #ffffff;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand img { height: 50px; }
        .hero-section {
            background: linear-gradient(rgba(0, 30, 60, 0.85), rgba(0, 30, 60, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
            position: relative;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 15px;
            margin-bottom: 40px;
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .product-img {
            transform: scale(1.05);
        }
        .bg-light-blue {
            background-color: #e9f5ff;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
        }
        .flink {
            display: inline-block;
            background: var(--secondary-color);
            padding: 10px 25px;
            margin: 8px;
            border-radius: 30px;
            color: var(--dark-color);
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
            border-color: var(--primary-color);
        }
        .footer {
            background: var(--dark-color);
            color: #aaa;
            padding-top: 50px;
        }
        .footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover { color: white; }
        .contact-info li { margin-bottom: 12px; }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #444;
            color: white;
            margin-right: 10px;
            transition: background 0.3s;
        }
        .social-icon:hover {
            background: var(--primary-color);
            color: white;
        }
        .btn-primary-custom {
            background: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background: #004494;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,86,179,0.3);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            border-left: 3px solid var(--primary-color);
        }
        .timeline-item {
            margin-bottom: 30px;
            position: relative;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--accent-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            z-index: 1000;
            opacity: 0.8;
            transition: all 0.3s;
        }
        .back-to-top:hover {
            opacity: 1;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section { padding: 100px 0; }
            .display-4 { font-size: 2.2rem; }
        }