:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover {
            color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1503376780353-7e6692767b70?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
        }
        .section-title {
            color: var(--primary-color);
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 70px;
            height: 4px;
            background: var(--secondary-color);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 1.8rem;
            transition: var(--transition);
        }
        .feature-item:hover .icon-box {
            background: var(--secondary-color);
            transform: rotate(15deg);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 8px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding-top: 3rem;
        }
        .footer-link {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-link:hover {
            color: white;
            padding-left: 5px;
        }
        .friendlink .flink {
            display: inline-block;
            background: white;
            color: var(--primary-color);
            padding: 0.6rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            border: 2px solid transparent;
            transition: var(--transition);
            box-shadow: 0 4px 10px rgba(0,0,0,0.08);
        }
        .friendlink .flink:hover {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .contact-info i {
            color: var(--accent-color);
            margin-right: 10px;
            font-size: 1.2rem;
        }
        .news-item {
            border-left: 4px solid var(--accent-color);
            padding-left: 1.5rem;
            margin-bottom: 2rem;
            transition: var(--transition);
        }
        .news-item:hover {
            border-left-color: var(--secondary-color);
            padding-left: 2rem;
        }
        .product-tag {
            display: inline-block;
            background: #e9f7f5;
            color: var(--accent-color);
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            margin: 0.3rem;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 5rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }