:root {
            --primary-color: #1a5fb4;
            --secondary-color: #26a269;
            --accent-color: #e5a50a;
            --dark-color: #1c1c1c;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 0.8rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            color: var(--dark-color);
            margin: 0 0.5rem;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
            background-color: rgba(26, 95, 180, 0.05);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1546519638-68e109498ffc?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1790&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 10rem 0 6rem;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .feature-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background-color: rgba(26, 95, 180, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .product-card {
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            height: 100%;
        }
        .product-card:hover {
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: all 0.3s ease;
            max-height: 80px;
            width: auto;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 50px;
            margin: 0.5rem;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            border: 1px solid #eaeaea;
            box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 95, 180, 0.2);
            border-color: var(--primary-color);
        }
        .footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            margin-right: 0.8rem;
            transition: all 0.3s ease;
        }
        .social-icon:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .navbar-nav {
                background-color: white;
                padding: 1rem;
                border-radius: 8px;
                box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
                margin-top: 1rem;
            }
        }
        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.8rem 2rem;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #144d8f;
            border-color: #144d8f;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 95, 180, 0.3);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 0.8rem 2rem;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #1e8a4f;
            border-color: #1e8a4f;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(38, 162, 105, 0.3);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            font-size: 1rem;
            color: var(--gray-color);
            font-weight: 500;
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
            border-left: 3px solid var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.4rem;
            top: 0.5rem;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.2);
        }