:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --accent-color: #20c997;
            --dark-color: #212529;
            --light-color: #f8f9fa;
            --transition-speed: 0.3s;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            overflow-x: hidden;
            line-height: 1.7;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(13, 110, 253, 0.7)), url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=1470&q=80') center/cover no-repeat fixed;
            color: white;
            padding: 160px 0 100px;
            position: relative;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
        }
        .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-hover {
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
            border: none;
            border-radius: 10px;
            overflow: hidden;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.8rem;
            margin-bottom: 20px;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            transition: color var(--transition-speed);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding-top: 60px;
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 5px;
            color: #ddd;
            text-decoration: none;
            transition: all var(--transition-speed);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .map-container {
            height: 300px;
            border-radius: 10px;
            overflow: hidden;
        }
        .contact-info li {
            margin-bottom: 15px;
            padding-left: 30px;
            position: relative;
        }
        .contact-info li i {
            position: absolute;
            left: 0;
            top: 5px;
            color: var(--accent-color);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 0;
            bottom: 0;
            width: 2px;
            background-color: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--accent-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all var(--transition-speed);
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 500;
            border-radius: 5px;
        }
        .btn-primary:hover {
            background-color: #0b5ed7;
            border-color: #0a58ca;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .sticky-nav {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            transition: all 0.4s ease;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
        }
        .product-tab {
            cursor: pointer;
        }
        .product-tab.active {
            background-color: var(--primary-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 60px;
                background-attachment: scroll;
            }
            .section-title {
                margin-bottom: 30px;
            }
            .feature-icon {
                width: 60px;
                height: 60px;
                font-size: 1.5rem;
            }
        }