:root {
            --primary-color: #1a5276;
            --secondary-color: #e67e22;
            --accent-color: #2ecc71;
            --light-color: #f8f9fa;
            --dark-color: #2c3e50;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem;
            color: var(--dark-color);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 82, 118, 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') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 150px 0 100px;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
        }
        .hero-section .lead {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #d35400;
            border-color: #d35400;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            text-align: center;
            border-top: 4px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            border-top-color: var(--secondary-color);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background-color: rgba(230, 126, 34, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
            color: var(--secondary-color);
        }
        .product-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.12);
        }
        .product-img {
            height: 250px;
            overflow: hidden;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img img {
            transform: scale(1.05);
        }
        .product-body {
            padding: 1.5rem;
        }
        .product-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: var(--primary-color);
        }
        .process-step {
            text-align: center;
            padding: 2rem 1.5rem;
            position: relative;
        }
        .step-number {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 1.5rem;
        }
        .about-img {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .about-img img {
            width: 100%;
            height: auto;
            transition: var(--transition);
        }
        .about-img:hover img {
            transform: scale(1.03);
        }
        .testimonial-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            box-shadow: var(--box-shadow);
            height: 100%;
        }
        .testimonial-text {
            font-style: italic;
            margin-bottom: 1.5rem;
            position: relative;
            padding-left: 1.5rem;
        }
        .testimonial-text:before {
            content: '"';
            position: absolute;
            left: 0;
            top: -10px;
            font-size: 3rem;
            color: rgba(230, 126, 34, 0.2);
            font-family: Georgia, serif;
        }
        .contact-info {
            padding: 2rem;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: rgba(26, 82, 118, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .friendlink {
            background-color: var(--light-color);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 50px;
            margin: 0.5rem;
            color: var(--dark-color);
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #eaeaea;
            text-decoration: none;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.8);
            padding: 4rem 0 1.5rem;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid rgba(230, 126, 34, 0.3);
        }
        .footer-links a {
            color: rgba(255, 255,255, 0.7);
            text-decoration: none;
            display: block;
            margin-bottom: 0.7rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-section h1 {
                font-size: 2.8rem;
            }
            .hero-section {
                padding: 120px 0 80px;
                min-height: auto;
            }
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.3rem;
            }
            .hero-section .lead {
                font-size: 1.1rem;
            }
            .section-title {
                margin-bottom: 2rem;
            }
        }
        @media (max-width: 576px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fadeInUp {
            animation: fadeInUp 0.8s ease forwards;
        }