:root {
            --primary-color: #1a5f7a;
            --secondary-color: #2a9d8f;
            --accent-color: #e9c46a;
            --dark-color: #264653;
            --light-color: #f8f9fa;
            --text-dark: #333;
            --text-light: #666;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 8px;
            transition: all 0.3s;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width 0.3s;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(42, 157, 143, 0.8)), url('https://images.unsplash.com/photo-1621967299229-c6e7085a7f2a?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 15px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .section-title.text-start::after {
            left: 0;
            transform: none;
        }
        .card-hover {
            transition: all 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--dark-color);
            border-color: var(--dark-color);
            transform: translateY(-2px);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 95, 122, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .icon-box i {
            font-size: 28px;
            color: var(--primary-color);
        }
        .product-img {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .process-step {
            position: relative;
            text-align: center;
            padding: 20px;
        }
        .process-step::before {
            content: attr(data-step);
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
        }
        footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding-top: 60px;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .friendlink {
            background-color: rgba(255, 255, 255, 0.05);
            padding: 20px;
            border-radius: 8px;
        }
        .flink {
            display: inline-block;
            margin: 5px 10px;
            padding: 5px 15px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 4px;
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--dark-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }