:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #e6af2e;
            --light-color: #f8f9fa;
            --dark-color: #2d3748;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1560518883-ce09059eeffa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--secondary-color);
        }
        .product-card {
            transition: transform 0.3s, box-shadow 0.3s;
            border: none;
            border-radius: 10px;
            overflow: hidden;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .product-img {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .process-step {
            position: relative;
            padding: 30px;
            background: var(--light-color);
            border-radius: 10px;
            text-align: center;
            height: 100%;
        }
        .process-step:before {
            content: attr(data-step);
            position: absolute;
            top: -15px;
            left: -15px;
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
        }
        .testimonial-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
            border-left: 4px solid var(--primary-color);
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding-top: 60px;
        }
        .flink {
            display: inline-block;
            padding: 8px 15px;
            background: rgba(255,255,255,0.1);
            border-radius: 5px;
            margin: 5px;
            transition: all 0.3s;
            color: #ddd;
            text-decoration: none;
        }
        .flink:hover {
            background: var(--accent-color);
            color: var(--dark-color);
            transform: translateY(-3px);
        }
        .btn-primary-custom {
            background: var(--primary-color);
            border: none;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .contact-info-box {
            background: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            height: 100%;
            transition: transform 0.3s;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .news-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            height: 100%;
            transition: transform 0.3s;
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--secondary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 5px;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .display-4 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }