:root {
            --primary-color: #0066cc;
            --secondary-color: #003366;
            --accent-color: #009933;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            margin: 0 8px;
            transition: all 0.3s ease;
            position: relative;
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            left: 50%;
            bottom: 0;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .navbar-nav .nav-link:hover::after {
            width: 80%;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 51, 102, 0.85), rgba(0, 51, 102, 0.9)), url('https://images.unsplash.com/photo-1586773860418-dc22f8b874bc?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 25px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 35px;
            opacity: 0.9;
        }
        .feature-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        .feature-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 2rem;
        }
        .product-card {
            border: 1px solid #e9ecef;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
            height: 100%;
        }
        .product-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 15px 30px rgba(0,102,204,0.1);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .about-section {
            background-color: #f8fafc;
            position: relative;
            overflow: hidden;
        }
        .about-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: linear-gradient(135deg, rgba(0,102,204,0.1) 0%, rgba(0,51,102,0.05) 100%);
            border-radius: 50%;
            top: -150px;
            right: -150px;
        }
        .about-section::after {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: linear-gradient(135deg, rgba(0,153,51,0.1) 0%, rgba(0,102,0,0.05) 100%);
            border-radius: 50%;
            bottom: -100px;
            left: -100px;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-left: 25px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .footer {
            background-color: var(--secondary-color);
            color: #e9ecef;
            padding-top: 70px;
            padding-bottom: 30px;
        }
        .footer-heading {
            color: white;
            font-weight: 600;
            margin-bottom: 25px;
            font-size: 1.3rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-heading::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 2px;
            background-color: var(--accent-color);
        }
        .footer-link {
            color: #adb5bd;
            text-decoration: none;
            transition: all 0.3s ease;
            display: block;
            margin-bottom: 10px;
        }
        .footer-link:hover {
            color: white;
            padding-left: 8px;
        }
        .contact-info li {
            margin-bottom: 15px;
            padding-left: 30px;
            position: relative;
        }
        .contact-info li i {
            position: absolute;
            left: 0;
            top: 5px;
            color: var(--accent-color);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            border-radius: 8px;
            padding: 15px 25px;
            margin: 10px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary-custom {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            color: white;
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,102,204,0.3);
            color: white;
        }
        .btn-accent {
            background-color: var(--accent-color);
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            color: white;
        }
        .btn-accent:hover {
            background-color: #00802b;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,153,51,0.3);
            color: white;
        }
        .fade-in {
            animation: fadeIn 1s ease-in-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .display-4 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .footer {
                text-align: center;
            }
            .footer-heading::after {
                left: 50%;
                transform: translateX(-50%);
            }
        }
        .content-section {
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 50px;
            font-weight: 700;
            color: var(--secondary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -15px;
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .quality-badge {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-color), #006633);
            color: white;
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 600;
            margin: 5px;
            font-size: 0.9rem;
        }
        .team-member {
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        .team-member:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .team-member img {
            height: 280px;
            object-fit: cover;
        }
        .counter-box {
            text-align: center;
            padding: 30px 20px;
            border-radius: 15px;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
        }
        .counter-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .counter {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
        }
        .counter-text {
            color: var(--gray-color);
            font-weight: 500;
            margin-top: 10px;
        }
        .long-content {
            text-align: justify;
            margin-bottom: 30px;
        }