:root {
            --primary-color: #c62828;
            --secondary-color: #388e3c;
            --accent-color: #f57c00;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --text-dark: #333;
            --text-light: #666;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
        }
        .bg-light-green {
            background-color: rgba(56, 142, 60, 0.05);
        }
        .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: color 0.3s;
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1546833999-b9f581a1996d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 25px;
        }
        .hero-section p {
            font-size: 1.2rem;
            margin-bottom: 35px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #a71c1c;
            border-color: #a71c1c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .feature-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            font-size: 2rem;
        }
        .product-card {
            border: 1px solid #eee;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s;
            height: 100%;
        }
        .product-card:hover {
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            border-color: var(--primary-color);
        }
        .product-img {
            height: 250px;
            overflow: hidden;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover .product-img img {
            transform: scale(1.05);
        }
        .product-tag {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--primary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.85rem;
        }
        .news-card {
            border: none;
            border-bottom: 3px solid #eee;
            border-radius: 0;
            padding-bottom: 20px;
            margin-bottom: 30px;
            transition: all 0.3s;
        }
        .news-card:hover {
            border-bottom-color: var(--primary-color);
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-right: 20px;
        }
        .contact-info {
            background: var(--dark-color);
            color: white;
            padding: 40px;
            border-radius: 10px;
            height: 100%;
        }
        .contact-info i {
            color: var(--accent-color);
            margin-right: 15px;
            width: 25px;
        }
        .contact-form {
            padding: 40px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
        }
        .form-control {
            padding: 12px 15px;
            border-radius: 4px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(198, 40, 40, 0.25);
        }
        .footer {
            background: var(--dark-color);
            color: #aaa;
            padding: 60px 0 30px;
        }
        .footer a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-color);
            display: inline-block;
        }
        .flink {
            display: inline-block;
            background: rgba(255, 255, 255, 0.1);
            padding: 8px 20px;
            border-radius: 4px;
            margin: 5px;
            transition: all 0.3s;
            color: #ddd;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
        }
        .certificate-item {
            text-align: center;
            padding: 20px;
            border: 1px solid #eee;
            border-radius: 8px;
            transition: all 0.3s;
        }
        .certificate-item:hover {
            border-color: var(--primary-color);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .certificate-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .timeline {
            position: relative;
            padding: 30px 0;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
            width: 2px;
            height: 100%;
            background: var(--primary-color);
        }
        .timeline-item {
            margin-bottom: 50px;
            position: relative;
            width: 50%;
            padding-right: 40px;
        }
        .timeline-item:nth-child(even) {
            margin-left: 50%;
            padding-left: 40px;
            padding-right: 0;
        }
        .timeline-dot {
            position: absolute;
            right: -10px;
            top: 0;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 4px solid white;
        }
        .timeline-item:nth-child(even) .timeline-dot {
            left: -10px;
            right: auto;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .timeline:before {
                left: 30px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 0;
            }
            .timeline-item:nth-child(even) {
                margin-left: 0;
                padding-left: 70px;
            }
            .timeline-dot {
                left: 20px;
                right: auto;
            }
            .timeline-item:nth-child(even) .timeline-dot {
                left: 20px;
            }
            .contact-info, .contact-form {
                padding: 25px;
            }
        }