:root {
            --primary-color: #0056a6;
            --secondary-color: #e63946;
            --dark-color: #1d3557;
            --light-color: #f1faee;
            --accent-color: #2a9d8f;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            transition: all 0.3s;
            margin: 0 5px;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(29, 53, 87, 0.85), rgba(29, 53, 87, 0.9)), url('https://images.unsplash.com/photo-1513475382585-d06e58bcb0e0?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0 100px;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 28px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004080;
            transform: scale(1.05);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .about-img {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 15px 15px 0 rgba(0,86,166,0.1);
        }
        .process-step {
            position: relative;
            padding: 25px;
            border-radius: 12px;
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .step-number {
            position: absolute;
            top: -20px;
            left: 20px;
            background: var(--accent-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.5rem;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px 10px;
            background: #f8f9fa;
            border-radius: 8px;
            color: var(--dark-color);
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: #f1faee;
            padding: 60px 0 20px;
        }
        .footer-link {
            color: #a8dadc;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
            text-decoration: underline;
        }
        .contact-info li {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        .contact-info i {
            margin-right: 10px;
            color: var(--accent-color);
            width: 20px;
        }
        .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;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .about-img {
                margin-bottom: 2rem;
            }
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding: 20px 0;
            transition: background 0.3s;
        }
        .news-item:hover {
            background: #f8f9fa;
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            padding: 5px 12px;
            border-radius: 5px;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .certificate-logo {
            filter: grayscale(0.2);
            opacity: 0.8;
            transition: all 0.3s;
            max-height: 80px;
        }
        .certificate-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .product-tab {
            border-bottom: none;
        }
        .product-tab .nav-link {
            border-radius: 8px 8px 0 0;
            margin: 0 5px;
            color: #666;
            font-weight: 600;
            border: 1px solid #dee2e6;
            border-bottom: none;
            background: #f8f9fa;
        }
        .product-tab .nav-link.active {
            background: white;
            color: var(--primary-color);
            border-bottom-color: white;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(0,86,166,0.05);
            color: var(--primary-color);
        }
        .sticky-nav {
            position: sticky;
            top: 0;
            z-index: 1020;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            transition: all 0.3s;
        }