@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');
        :root {
            --primary: #a82e2e;
            --primary-dark: #8a2525;
            --secondary: #2c5282;
            --accent: #d69e2e;
            --light-bg: #f8f5f0;
            --dark-text: #2d3748;
        }
        body {
            font-family: 'Inter', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, .serif {
            font-family: 'Noto Serif SC', serif;
        }
        .nav-link {
            position: relative;
            padding-bottom: 5px;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--primary);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero-gradient {
            background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.4)), url('https://images.unsplash.com/photo-1549399542-7e3f8b79c341?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
        }
        .product-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        .product-img {
            transition: transform 0.6s ease;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background: #f1f5f9;
            border-radius: 6px;
            color: #475569;
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-2px);
            border-color: var(--primary);
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
        }
        .btn-primary {
            background-color: var(--primary);
            color: white;
            padding: 12px 28px;
            border-radius: 4px;
            font-weight: 500;
            transition: background-color 0.3s ease, transform 0.2s ease;
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .process-step {
            position: relative;
            padding-left: 40px;
        }
        .process-step::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 24px;
            height: 24px;
            background-color: var(--primary);
            border-radius: 50%;
        }
        .footer-link {
            color: #cbd5e0;
            transition: color 0.3s ease;
        }
        .footer-link:hover {
            color: white;
        }
        .sticky-nav {
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }
        .sticky-nav.scrolled {
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }