:root {
            --primary-color: #0a3d62;
            --secondary-color: #3c6382;
            --accent-color: #f9ca24;
            --light-color: #f5f6fa;
            --dark-color: #2c3e50;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            color: var(--dark-color);
            font-weight: 700;
        }
        .navbar {
            background-color: rgba(10, 61, 98, 0.95);
            padding: 1rem 0;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: white !important;
        }
        .nav-link {
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            margin: 0 0.5rem;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(10, 61, 98, 0.85), rgba(60, 99, 130, 0.9)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
        }
        .hero-title {
            font-size: 3.2rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            max-width: 700px;
        }
        .btn-primary-custom {
            background-color: var(--accent-color);
            border: none;
            color: var(--dark-color);
            padding: 0.8rem 2.2rem;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(249, 202, 36, 0.3);
        }
        .btn-primary-custom:hover {
            background-color: #e8b810;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(249, 202, 36, 0.5);
        }
        .section-title {
            position: relative;
            margin-bottom: 3.5rem;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 4px;
            background-color: var(--accent-color);
        }
        .section-title.text-center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-custom {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 6px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.15);
        }
        .card-custom .card-icon {
            font-size: 2.5rem;
            color: var(--accent-color);
            margin-bottom: 1.5rem;
        }
        .service-img {
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card-custom:hover .service-img {
            transform: scale(1.05);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--secondary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -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 30px;
            background-color: white;
            position: relative;
            border-radius: 6px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }
        .timeline-item:nth-child(odd)::before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -13px;
            background-color: white;
            border: 4px solid var(--accent-color);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        .timeline-item:nth-child(even)::before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -13px;
            background-color: white;
            border: 4px solid var(--accent-color);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        @media screen and (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:nth-child(odd)::before, .timeline-item:nth-child(even)::before {
                left: 18px;
                right: auto;
            }
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .contact-info-box {
            background: var(--light-color);
            padding: 2rem;
            border-radius: 10px;
            border-left: 5px solid var(--accent-color);
            margin-bottom: 2rem;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background: #eef1f7;
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background-color: #f8f9fa;
            border-radius: 6px;
            color: var(--dark-color);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding: 4rem 0 2rem;
        }
        footer a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .footer-bottom {
            border-top: 1px solid #444;
            padding-top: 1.5rem;
            margin-top: 3rem;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--accent-color);
            color: var(--dark-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #e8b810;
            color: #000;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .stats-item {
            text-align: center;
            padding: 2rem;
        }
        .modal-image {
            width: 100%;
            border-radius: 8px;
            margin-bottom: 1rem;
        }
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }