:root {
            --primary-color: #1a5fb4;
            --secondary-color: #2ecc71;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --shadow: 0 5px 15px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
        }
        .navbar {
            box-shadow: var(--shadow);
            background-color: rgba(255,255,255,0.95);
            transition: var(--transition);
        }
        .navbar.scrolled {
            background-color: #fff;
        }
        .hero-section {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(26, 95, 180, 0.9)), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 20px;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 100px 0;
            }
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
        }
        .service-card, .product-card {
            border: none;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover, .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }
        .service-icon, .product-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .team-img {
            width: 150px;
            height: 150px;
            object-fit: cover;
            border: 5px solid #eee;
            border-radius: 50%;
        }
        .contact-info i {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-right: 10px;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--secondary-color);
        }
        .friendlink .flink {
            display: inline-block;
            margin: 5px 10px;
            padding: 8px 20px;
            background: #f1f1f1;
            border-radius: 30px;
            color: #333;
            text-decoration: none;
            transition: var(--transition);
        }
        .friendlink .flink:hover {
            background: var(--primary-color);
            color: white;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 30px;
            border-radius: 30px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #144a8c;
            border-color: #144a8c;
            transform: scale(1.05);
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-left: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -38px;
            top: 5px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--secondary-color);
            border: 4px solid var(--primary-color);
        }