:root {
            --primary-color: #003366;
            --secondary-color: #cc0000;
            --accent-color: #ffcc00;
            --light-color: #f8f9fa;
            --dark-color: #333333;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.6;
        }
        .navbar {
            background-color: rgba(0, 51, 102, 0.95);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            padding-top: 15px;
            padding-bottom: 15px;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: white !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            margin: 0 8px;
            transition: all 0.3s;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            left: 0;
            bottom: -5px;
            transition: width 0.3s;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero {
            background: linear-gradient(rgba(0, 51, 102, 0.85), rgba(0, 51, 102, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0 100px;
            margin-top: 76px;
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero p {
            font-size: 1.3rem;
            margin-bottom: 35px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 35px;
            font-weight: 600;
            border-radius: 30px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #b30000;
            border-color: #b30000;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(204,0,0,0.2);
        }
        .btn-outline-light {
            border-radius: 30px;
            padding: 12px 35px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-outline-light:hover {
            background-color: white;
            color: var(--primary-color);
            transform: translateY(-3px);
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            text-align: center;
        }
        .section-title h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            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%);
        }
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 40px 30px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            height: 100%;
            transition: all 0.4s;
            border-top: 4px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            border-top-color: var(--secondary-color);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: rgba(0, 51, 102, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: var(--primary-color);
            font-size: 2.2rem;
            transition: all 0.3s;
        }
        .feature-card:hover .feature-icon {
            background-color: var(--primary-color);
            color: white;
        }
        .product-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .product-card img {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .product-card .card-body {
            padding: 25px;
        }
        .badge-custom {
            background-color: var(--accent-color);
            color: var(--dark-color);
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            background-color: white;
            border: 4px solid var(--secondary-color);
            border-radius: 50%;
            top: 15px;
            right: -12px;
            z-index: 1;
        }
        .left {
            left: 0;
        }
        .right {
            left: 50%;
        }
        .right::after {
            left: -12px;
        }
        .timeline-content {
            padding: 20px 30px;
            background-color: white;
            position: relative;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .timeline-content h4 {
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .contact-info {
            background-color: var(--light-color);
            border-radius: 10px;
            padding: 40px 30px;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        .contact-form .form-control {
            padding: 15px;
            border-radius: 8px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: all 0.3s;
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 51, 102, 0.25);
        }
        .friendlink {
            background-color: var(--light-color);
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 8px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            border: 1px solid #eee;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding-top: 70px;
        }
        footer h5 {
            color: var(--accent-color);
            margin-bottom: 25px;
            font-weight: 600;
        }
        footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: all 0.3s;
        }
        footer a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .footer-bottom {
            background-color: rgba(0,0,0,0.2);
            padding: 25px 0;
            margin-top: 50px;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero {
                padding: 80px 0 60px;
                margin-top: 66px;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-title h2 {
                font-size: 2rem;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item::after {
                left: 19px;
                right: auto;
            }
            .left, .right {
                left: 0;
            }
        }