:root {
            --primary-color: #2c5282;
            --secondary-color: #e53e3e;
            --accent-color: #38a169;
            --light-bg: #f7fafc;
            --dark-text: #2d3748;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            overflow-x: hidden;
            line-height: 1.7;
        }
        .hero-section {
            background: linear-gradient(rgba(44, 82, 130, 0.88), rgba(26, 32, 44, 0.92)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -15px;
            width: 70px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-color), #4a7fb6);
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background: linear-gradient(to right, #1a365d, var(--primary-color));
            transform: scale(1.05);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: rgba(44, 82, 130, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary-color);
            font-size: 28px;
        }
        .navbar-brand img {
            max-height: 50px;
        }
        .navbar {
            padding-top: 20px;
            padding-bottom: 20px;
            transition: var(--transition);
            background: rgba(255,255,255,0.95) !important;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .navbar.scrolled {
            padding-top: 10px;
            padding-bottom: 10px;
            background: rgba(255,255,255,0.98) !important;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 8px;
            color: var(--dark-text) !important;
            position: relative;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .stat-box {
            text-align: center;
            padding: 30px;
            border-radius: 10px;
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .stat-number {
            font-size: 48px;
            font-weight: 800;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .stat-label {
            font-size: 16px;
            color: #718096;
            margin-top: 10px;
        }
        footer {
            background: #1a202c;
            color: #a0aec0;
            padding-top: 80px;
        }
        footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.05);
            padding: 10px 20px;
            margin: 5px 10px 5px 0;
            border-radius: 5px;
            transition: var(--transition);
            color: #cbd5e0;
            border: 1px solid rgba(255,255,255,0.1);
        }
        .flink:hover {
            background: rgba(255,255,255,0.1);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            border-top-left-radius: .375rem;
            border-top-right-radius: .375rem;
        }
        .contact-info-box {
            padding: 30px;
            border-radius: 10px;
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 30px;
            text-align: center;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .contact-icon {
            font-size: 40px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .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 30px;
            background: white;
            position: relative;
            border-radius: 6px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background: white;
            top: 30px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 0 4px var(--primary-color);
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            background: white;
            top: 30px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 0 4px var(--primary-color);
        }
        @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) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: 21px;
                right: auto;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(44, 82, 130, 0.3);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        .map-responsive {
            overflow: hidden;
            padding-bottom: 56.25%;
            position: relative;
            height: 0;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .map-responsive iframe {
            left: 0;
            top: 0;
            height: 100%;
            width: 100%;
            position: absolute;
            border: 0;
        }