:root {
            --primary-color: #1a5f7a;
            --secondary-color: #57cc99;
            --accent-color: #ff7b54;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 95, 122, 0.9) 0%, rgba(87, 204, 153, 0.8) 100%), url('https://images.unsplash.com/photo-1559757148-5c350d0d3c56?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background: var(--secondary-color);
            border: none;
            padding: 12px 35px;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
            color: white;
        }
        .btn-primary-custom:hover {
            background: #3db37d;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            text-align: center;
            color: var(--primary-color);
        }
        .section-title h2 {
            font-weight: 700;
            font-size: 2.5rem;
            display: inline-block;
            padding-bottom: 15px;
        }
        .section-title h2::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            background: white;
            border-radius: 15px;
            padding: 30px;
            height: 100%;
            transition: var(--transition);
            border: 1px solid #eee;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            color: white;
            font-size: 1.8rem;
        }
        .about-img {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .product-card {
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            background: white;
            box-shadow: 0 10px 20px rgba(0,0,0,0.08);
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .product-img {
            height: 250px;
            overflow: hidden;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img img {
            transform: scale(1.05);
        }
        .product-body {
            padding: 25px;
        }
        .product-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 15px;
        }
        .case-study {
            background: linear-gradient(rgba(26, 95, 122, 0.9), rgba(26, 95, 122, 0.9)), url('https://images.unsplash.com/photo-1519494026892-80bbd2d6fd0d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover fixed;
            color: white;
            padding: 100px 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--secondary-color);
            margin-bottom: 10px;
        }
        .team-card {
            text-align: center;
            padding: 30px 20px;
            border-radius: 15px;
            transition: var(--transition);
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 20px;
            border: 5px solid #f1f1f1;
        }
        .news-card {
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--primary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 30px;
            font-size: 0.9rem;
        }
        .contact-info {
            background: var(--primary-color);
            color: white;
            border-radius: 15px;
            padding: 40px;
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 1.5rem;
        }
        .form-control {
            padding: 12px 20px;
            border-radius: 10px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(87, 204, 153, 0.25);
        }
        .footer {
            background: #1a1f2e;
            color: #b0b7c3;
            padding: 80px 0 30px;
        }
        .footer-title {
            color: white;
            font-weight: 700;
            margin-bottom: 30px;
            font-size: 1.3rem;
            position: relative;
            padding-bottom: 15px;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary-color);
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 10px;
            color: white;
            transition: var(--transition);
        }
        .social-links a:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 30px;
            margin-top: 50px;
            text-align: center;
        }
        .friendlink {
            background: #f8f9fa;
            padding: 80px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 15px 30px;
            margin: 10px;
            border-radius: 10px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #eee;
            box-shadow: 0 5px 15px rgba(0,0,0,0.03);
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            color: var(--primary-color);
            border-color: var(--secondary-color);
        }
        .scroll-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;
            cursor: pointer;
            transition: var(--transition);
            z-index: 999;
            opacity: 0;
            visibility: hidden;
        }
        .scroll-top.active {
            opacity: 1;
            visibility: visible;
        }
        .scroll-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title h2 {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }