:root {
            --primary-color: #1a365d;
            --secondary-color: #2d3748;
            --accent-color: #c53030;
            --light-color: #f7fafc;
            --text-dark: #2d3748;
            --text-light: #718096;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            color: var(--secondary-color);
            transition: var(--transition);
            padding: 0.5rem 1rem !important;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 54, 93, 0.9) 0%, rgba(45, 55, 72, 0.85) 100%), url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') no-repeat center center/cover;
            color: white;
            padding: 8rem 0;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .section-title {
            position: relative;
            color: var(--primary-color);
            margin-bottom: 3rem;
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--accent-color);
        }
        .text-center .section-title:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background-color: rgba(197, 48, 48, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--accent-color);
            font-size: 2rem;
        }
        .btn-primary-custom {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 6px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #9c2c2c;
            border-color: #9c2c2c;
            transform: translateY(-2px);
            color: white;
        }
        .contact-info-box {
            background-color: var(--light-color);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .flink {
            display: inline-block;
            background-color: #f8f9fa;
            color: var(--secondary-color);
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        .footer-link {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-link:hover {
            color: white;
            text-decoration: underline;
        }
        .map-container {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            height: 300px;
        }
        .timeline {
            position: relative;
            max-width: 1000px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-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;
            background-color: white;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .timeline-item:nth-child(odd)::before {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            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: 25px;
            height: 25px;
            left: -13px;
            background-color: white;
            border: 4px solid var(--accent-color);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        @media (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;
            }
        }
        .product-card img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--accent-color);
        }
        .stats-label {
            font-size: 1.1rem;
            color: var(--text-light);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }