:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --accent-color: #ffc107;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), #003d82);
            color: white;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .hero {
            background: url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            padding: 120px 0;
            color: white;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.7);
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
        }
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .hero { padding: 80px 0; }
        }
        .section-title {
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 30px;
            font-weight: 700;
            color: var(--dark-color);
        }
        .card {
            border: none;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            border-top-left-radius: 10px;
            border-top-right-radius: 10px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
        }
        .contact-info i {
            color: var(--primary-color);
            font-size: 1.5rem;
            margin-right: 10px;
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 40px 0 20px;
        }
        .friendlink {
            background-color: #f1f1f1;
            padding: 30px 0;
        }
        .flink {
            display: inline-block;
            margin: 5px 15px;
            padding: 8px 20px;
            background: white;
            border-radius: 20px;
            color: var(--primary-color);
            text-decoration: none;
            border: 1px solid #ddd;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding: 15px 0;
        }
        .news-item:last-child {
            border-bottom: none;
        }
        .hover-effect {
            transition: color 0.3s ease;
        }
        .hover-effect:hover {
            color: var(--primary-color);
        }
        .map-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .icon-box {
            background: var(--light-color);
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            height: 100%;
            transition: background 0.3s ease;
        }
        .icon-box:hover {
            background: #e9ecef;
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: 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: var(--secondary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        .cert-img {
            border: 1px solid #ddd;
            border-radius: 5px;
            padding: 5px;
            background: white;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(0, 86, 179, 0.1);
            color: var(--primary-color);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
        }