:root {
            --primary-color: #c17d3a;
            --secondary-color: #2c3e50;
            --accent-color: #e67e22;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .hero-section {
            background: linear-gradient(rgba(44, 62, 80, 0.85), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
                background-attachment: scroll;
            }
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
            text-align: center;
            color: var(--secondary-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .section-title.left:after {
            left: 0;
            transform: none;
        }
        .product-card {
            border: 1px solid rgba(0,0,0,0.1);
            border-radius: 10px;
            overflow: hidden;
            transition: all 0.3s ease;
            height: 100%;
            background: white;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .product-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .bg-light-gray {
            background-color: #f8f9fa;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #a8692f;
            border-color: #a8692f;
            transform: translateY(-2px);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--secondary-color);
        }
        .navbar-brand span {
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 8px;
            position: relative;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            left: 0;
            bottom: 0;
            transition: width 0.3s;
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .stats-box {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            text-align: center;
            transition: transform 0.3s;
        }
        .stats-box:hover {
            transform: translateY(-5px);
        }
        .stats-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px 10px;
            background: #f1f1f1;
            border-radius: 5px;
            color: var(--secondary-color);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #ddd;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        .footer {
            background: var(--secondary-color);
            color: #ddd;
            padding-top: 60px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: var(--primary-color);
        }
        .footer-bottom {
            background: rgba(0,0,0,0.2);
            padding: 20px 0;
            margin-top: 40px;
        }
        .process-step {
            position: relative;
            padding-left: 40px;
            margin-bottom: 40px;
        }
        .process-step:before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            left: 0;
            top: 5px;
        }
        .process-step:after {
            content: '';
            position: absolute;
            width: 2px;
            height: calc(100% + 20px);
            background: #ddd;
            left: 9px;
            top: 25px;
        }
        .process-step:last-child:after {
            display: none;
        }
        .certificate-img {
            border: 1px solid #eee;
            border-radius: 5px;
            padding: 10px;
            background: white;
            transition: transform 0.3s;
        }
        .certificate-img:hover {
            transform: scale(1.03);
        }
        .contact-info-box {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            margin-bottom: 30px;
            height: 100%;
            text-align: center;
        }
        .contact-info-box i {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .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;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #a8692f;
            color: white;
        }