:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --accent-color: #f59e0b;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
            color: #374151;
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem !important;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.9) 0%, rgba(14, 159, 110, 0.8) 100%), url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1) !important;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
        }
        .process-step {
            position: relative;
            padding: 2rem;
            background: var(--light-color);
            border-radius: 12px;
            border-left: 5px solid var(--primary-color);
        }
        .process-step:before {
            content: attr(data-step);
            position: absolute;
            top: -15px;
            left: -15px;
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .flink {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            background: var(--light-color);
            border-radius: 8px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e5e7eb;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        .contact-info i {
            width: 50px;
            height: 50px;
            background: var(--light-color);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--primary-color);
            font-size: 1.2rem;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .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;
            cursor: pointer;
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
        }
        footer {
            background: var(--dark-color);
            color: #d1d5db;
        }
        footer a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .product-img {
            transform: scale(1.05);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0;
            }
            .stats-number {
                font-size: 2.5rem;
            }
            .section-title:after {
                left: 0;
                transform: none;
            }
        }