:root {
            --primary-color: #1a365d;
            --secondary-color: #2d6bc4;
            --accent-color: #e63946;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(26, 54, 93, 0.95) !important;
            padding: 1rem 0;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: white !important;
        }
        .navbar-brand img {
            max-height: 50px;
            margin-right: 10px;
        }
        .nav-link {
            color: rgba(255, 255, 255, 0.9) !important;
            font-weight: 500;
            margin: 0 8px;
            padding: 8px 16px !important;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: white !important;
            background-color: rgba(45, 107, 196, 0.3);
            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-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 160px 0 120px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2.5rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--accent-color);
            border: none;
            padding: 14px 32px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s;
            color: white;
        }
        .btn-primary-custom:hover {
            background-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(230, 57, 70, 0.3);
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            text-align: center;
        }
        .section-title h2 {
            font-size: 2.8rem;
            display: inline-block;
            padding-bottom: 15px;
        }
        .section-title h2:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .icon-box {
            background: white;
            padding: 40px 30px;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
            border-top: 4px solid var(--secondary-color);
        }
        .icon-box:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 25px;
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            transition: all 0.4s;
            height: 100%;
            background: white;
        }
        .product-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }
        .product-card img {
            height: 240px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .product-card-body {
            padding: 25px;
        }
        .news-card {
            border-left: 4px solid var(--secondary-color);
            padding-left: 20px;
            margin-bottom: 30px;
            transition: all 0.3s;
        }
        .news-card:hover {
            border-left-color: var(--accent-color);
            padding-left: 25px;
        }
        .news-date {
            color: var(--gray-color);
            font-size: 0.9rem;
            margin-bottom: 8px;
        }
        .contact-info-box {
            background: var(--light-color);
            padding: 30px;
            border-radius: 8px;
            height: 100%;
            border-left: 5px solid var(--secondary-color);
        }
        .contact-info-box i {
            color: var(--secondary-color);
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        .flink {
            display: inline-block;
            padding: 10px 25px;
            margin: 8px;
            background: var(--light-color);
            color: var(--dark-color);
            border-radius: 4px;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        footer {
            background-color: var(--primary-color);
            color: rgba(255, 255, 255, 0.85);
            padding: 70px 0 30px;
        }
        footer a {
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 25px;
            margin-top: 50px;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            transition: all 0.3s;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-padding {
                padding: 70px 0;
            }
            .section-title h2 {
                font-size: 2.2rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }