:root {
            --primary-color: #0056b3;
            --primary-dark: #004085;
            --primary-light: #007bff;
            --secondary-color: #343a40;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --light-gray: #e9ecef;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --info-color: #17a2b8;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 5px;
            border-bottom: 2px solid transparent;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
            border-bottom-color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.9), rgba(0, 64, 133, 0.9)), url('https://images.unsplash.com/photo-1621451537084-482c73073a0f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            font-weight: 700;
            color: var(--secondary-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-light {
            background-color: var(--light-gray);
        }
        .feature-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1) !important;
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .product-card {
            border: none;
            overflow: hidden;
            transition: transform 0.3s;
        }
        .product-card:hover {
            transform: translateY(-5px);
        }
        .product-card img {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background-color: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 40px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-light);
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-info {
            padding: 30px;
            border-radius: 10px;
            height: 100%;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: rgba(0, 86, 179, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .stats-item {
            text-align: center;
            padding: 30px 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        footer {
            background-color: var(--secondary-color);
            color: white;
            padding: 70px 0 20px;
        }
        footer a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .footer-title {
            font-weight: 600;
            margin-bottom: 25px;
            font-size: 1.2rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 2px;
            background-color: var(--primary-color);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 50px;
        }
        friendlink {
            display: block;
            margin-bottom: 30px;
        }
        .flink {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.8);
            padding: 8px 20px;
            border-radius: 30px;
            margin: 0 10px 10px 0;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-2px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 60px 0;
            }
            .hero-section {
                padding: 100px 0 60px;
            }
            .stats-number {
                font-size: 2.5rem;
            }
        }