:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --accent-color: #dc3545;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        .navbar {
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 1rem 0;
            transition: var(--transition);
            background-color: rgba(255, 255, 255, 0.98);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            left: 50%;
            bottom: 0;
            transition: var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
            left: 0;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(13, 110, 253, 0.9)), url('https://images.unsplash.com/photo-1549399542-7e3f8b79c341?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 8rem 0;
            margin-top: 76px;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 60px;
            height: 4px;
            background: var(--accent-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .service-card, .product-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover, .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon, .feature-icon {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .feature-icon {
            background: var(--light-bg);
            color: var(--primary-color);
        }
        .stats-section {
            background: linear-gradient(135deg, var(--primary-color), #0b5ed7);
            color: white;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background: var(--light-bg);
            border-radius: 50px;
            color: var(--dark-bg);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background: var(--dark-bg);
            color: #adb5bd;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-bottom {
            border-top: 1px solid #495057;
            padding-top: 1.5rem;
            margin-top: 3rem;
        }
        .btn-primary {
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(13, 110, 253, 0.4);
        }
        .carousel-item img {
            height: 500px;
            object-fit: cover;
        }
        .form-control {
            padding: 0.75rem 1rem;
            border-radius: 8px;
            border: 1px solid #ced4da;
        }
        .form-control:focus {
            box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
            border-color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
                text-align: center;
            }
            .navbar-nav {
                text-align: center;
                background: white;
                border-radius: 10px;
                padding: 1rem;
                box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            }
            .carousel-item img {
                height: 300px;
            }
        }