:root {
            --primary-color: #1a4f8c;
            --secondary-color: #d32f2f;
            --accent-color: #ff9800;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar {
            background: rgba(255, 255, 255, 0.97);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        .navbar.scrolled {
            padding-top: 5px;
            padding-bottom: 5px;
        }
        .nav-link {
            color: var(--dark-color) !important;
            font-weight: 500;
            padding: 0.5rem 1.2rem !important;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            bottom: 0;
            left: 50%;
            transition: all 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 70%;
            left: 15%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 79, 140, 0.85), rgba(26, 79, 140, 0.9)), url('https://images.unsplash.com/photo-1504384308090-c894fdcc538d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 160px 0 100px;
            position: relative;
        }
        .hero-section h1 {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-section p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2rem;
        }
        .btn-primary-custom {
            background: var(--secondary-color);
            border: none;
            padding: 12px 32px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background: #b71c1c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            color: var(--primary-color);
            font-weight: 700;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            border-radius: 8px;
            overflow: hidden;
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15) !important;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .service-card {
            border-top: 4px solid var(--primary-color);
            padding-top: 25px;
        }
        .product-card img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .stats-section {
            background: linear-gradient(rgba(26, 79, 140, 0.9), rgba(26, 79, 140, 0.95)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-attachment: fixed;
            color: white;
            padding: 80px 0;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px 25px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            position: relative;
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            top: 30px;
            background: white;
            transform: rotate(45deg);
            box-shadow: 3px -3px 5px rgba(0,0,0,0.05);
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            top: 30px;
            background: white;
            transform: rotate(45deg);
            box-shadow: -3px 3px 5px rgba(0,0,0,0.05);
        }
        .timeline-dot {
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background: var(--secondary-color);
            border: 4px solid white;
            border-radius: 50%;
            z-index: 1;
            top: 30px;
        }
        .timeline-item:nth-child(even) .timeline-dot {
            left: -10px;
        }
        .contact-info-box {
            background: var(--light-color);
            border-left: 4px solid var(--primary-color);
            padding: 25px;
            margin-bottom: 25px;
            border-radius: 0 8px 8px 0;
            transition: all 0.3s ease;
        }
        .contact-info-box:hover {
            background: white;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .flink {
            display: inline-block;
            background: var(--light-color);
            padding: 10px 25px;
            margin: 8px;
            border-radius: 4px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #dee2e6;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
            text-decoration: none;
        }
        footer {
            background: #222;
            color: #aaa;
            padding-top: 50px;
        }
        footer h5 {
            color: white;
            margin-bottom: 25px;
            font-weight: 600;
            position: relative;
            padding-bottom: 10px;
        }
        footer h5::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-bottom {
            background: #111;
            padding: 20px 0;
            margin-top: 40px;
            border-top: 1px solid #333;
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: #333;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            color: white;
            transition: all 0.3s ease;
        }
        .social-icons a:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 120px 0 60px;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-dot {
                left: 21px !important;
                right: auto;
            }
            .timeline-item:nth-child(odd) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: -10px;
                right: auto;
                top: 30px;
                box-shadow: -3px 3px 5px rgba(0,0,0,0.05);
            }
            .section-title {
                font-size: 1.8rem;
            }
        }