:root {
            --primary-color: #0056b3;
            --secondary-color: #f8f9fa;
            --accent-color: #28a745;
            --dark-color: #343a40;
            --light-color: #ffffff;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem !important;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 180, 0.85), rgba(0, 84, 180, 0.9)), url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
        }
        .hero-section h1 {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .section-title {
            position: relative;
            margin-bottom: 3.5rem;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -12px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .section-title.left:after {
            left: 0;
            transform: none;
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: var(--shadow);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: rgba(0, 86, 179, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0, 86, 179, 0.25);
        }
        .service-img {
            height: 220px;
            object-fit: cover;
            border-top-left-radius: 0.375rem;
            border-top-right-radius: 0.375rem;
        }
        .product-card {
            border: 1px solid #eee;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
        }
        .product-card:hover {
            border-color: var(--primary-color);
        }
        .product-img {
            height: 200px;
            object-fit: contain;
            background: #f9f9f9;
            padding: 15px;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            transition: var(--transition);
        }
        .news-card:hover {
            background-color: #f8faff;
            transform: translateX(5px);
        }
        .contact-info-box {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 2rem;
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background: var(--primary-color);
            color: white;
        }
        .contact-info-box:hover i {
            color: white;
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            transition: var(--transition);
        }
        friendlink {
            display: block;
            margin-top: 4rem;
            padding-top: 3rem;
            border-top: 1px solid #eee;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background: #f1f5f9;
            border-radius: 50px;
            color: #475569;
            text-decoration: none;
            transition: var(--transition);
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background: #1a202c;
            color: #cbd5e0;
            padding-top: 4rem;
        }
        footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .footer-bottom {
            border-top: 1px solid #2d3748;
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .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;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #004494;
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 7rem 0 5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .stats-label {
            font-size: 1.1rem;
            color: #666;
        }