:root {
            --primary-color: #1a56db;
            --secondary-color: #0e4aa7;
            --accent-color: #f97316;
            --light-color: #f8f9fa;
            --dark-color: #1f2937;
            --text-color: #374151;
            --border-radius: 8px;
            --shadow: 0 4px 12px 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: 1.6;
        }
        .header-sticky {
            position: sticky;
            top: 0;
            z-index: 1030;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            color: var(--dark-color);
            padding: 0.5rem 1rem;
            transition: var(--transition);
            border-radius: var(--border-radius);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
            background-color: rgba(26, 86, 219, 0.08);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.9) 0%, rgba(14, 74, 167, 0.9) 100%), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=1770&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 6rem 0;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            border-radius: 2px;
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: var(--shadow);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
        }
        .product-card {
            border-top: 4px solid var(--primary-color);
            overflow: hidden;
        }
        .product-card img {
            transition: transform 0.5s ease;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: rgba(26, 86, 219, 0.1);
            color: var(--primary-color);
            border-radius: 50%;
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
        }
        .feature-item {
            padding: 2rem;
            border-radius: var(--border-radius);
            background-color: white;
            box-shadow: var(--shadow);
            height: 100%;
            transition: var(--transition);
        }
        .feature-item:hover {
            background-color: rgba(26, 86, 219, 0.03);
            transform: translateY(-5px);
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .contact-info-box {
            background-color: var(--light-color);
            padding: 2rem;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--primary-color);
        }
        .footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.85);
        }
        .footer a {
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .friendlink a.flink {
            display: inline-block;
            padding: 0.5rem 1rem;
            margin: 0.5rem;
            background-color: var(--light-color);
            color: var(--dark-color);
            border-radius: var(--border-radius);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #e5e7eb;
        }
        .friendlink a.flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .testimonial-card {
            background-color: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            position: relative;
        }
        .testimonial-card::before {
            content: "\f10d";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            font-size: 2rem;
            color: rgba(26, 86, 219, 0.1);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stats-number {
                font-size: 2.2rem;
            }
        }