:root {
            --primary: #1a365d;
            --secondary: #e63946;
            --accent: #2a9d8f;
            --light: #f8f9fa;
            --dark: #343a40;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            color: var(--primary);
            font-weight: 700;
        }
        .navbar {
            background-color: rgba(255,255,255,0.98);
            box-shadow: var(--shadow);
            padding: 0.8rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark) !important;
            margin: 0 0.3rem;
            border-bottom: 2px solid transparent;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary) !important;
            border-bottom-color: var(--secondary);
        }
        .hero {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1579532537598-459ecdaf39cc?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
        }
        .hero h1 {
            color: white;
            font-size: 3.2rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }
        .hero .lead {
            font-size: 1.3rem;
            opacity: 0.95;
        }
        .btn-primary {
            background-color: var(--secondary);
            border-color: var(--secondary);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #c1121f;
            border-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(230, 57, 70, 0.2);
        }
        .btn-outline-light:hover {
            background-color: rgba(255,255,255,0.15);
        }
        .section-padding {
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3.5rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: rgba(42, 157, 143, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: var(--accent);
            font-size: 1.8rem;
            transition: var(--transition);
        }
        .feature-card:hover .icon-box {
            background-color: var(--accent);
            color: white;
            transform: scale(1.1);
        }
        .feature-card {
            padding: 2.5rem 2rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            height: 100%;
            background: white;
            transition: var(--transition);
            border: 1px solid rgba(0,0,0,0.05);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.12);
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .product-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.15);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .news-card {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin-bottom: 2rem;
        }
        .news-date {
            color: var(--secondary);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .contact-info-box {
            padding: 2rem;
            border-radius: 10px;
            background: white;
            box-shadow: var(--shadow);
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background: var(--primary);
            color: white;
        }
        .contact-info-box:hover i,
        .contact-info-box:hover h5 {
            color: white !important;
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 1.2rem;
            transition: var(--transition);
        }
        footer {
            background-color: var(--primary);
            color: rgba(255,255,255,0.85);
            padding-top: 4rem;
        }
        footer a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .flink {
            display: inline-block;
            padding: 0.4rem 1rem;
            margin: 0.3rem;
            background: rgba(255,255,255,0.1);
            border-radius: 4px;
            transition: var(--transition);
            color: rgba(255,255,255,0.85);
            text-decoration: none;
        }
        .flink:hover {
            background: var(--accent);
            color: white;
            transform: translateY(-2px);
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
            .navbar-nav {
                background: white;
                padding: 1rem;
                border-radius: 8px;
                margin-top: 0.5rem;
                box-shadow: var(--shadow);
            }
        }