:root {
            --primary-color: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary-color: #6b7280;
            --light-bg: #f8fafc;
            --dark-bg: #1e293b;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --border-color: #e5e7eb;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--text-dark) !important;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 0.5rem;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: var(--primary-color);
            color: white !important;
        }
        .hero-section {
            background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ff 100%);
            padding: 8rem 0 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 70%;
            height: 200%;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
            z-index: 0;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }
        .hero-subtitle {
            font-size: 1.25rem;
            color: var(--text-light);
            margin-bottom: 2rem;
            max-width: 600px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 0.5rem;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
        }
        .section-title {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        .service-card {
            background: white;
            border-radius: 1rem;
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border-color: var(--primary-color);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #e6f7ff 0%, #f0f9ff 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--primary-color);
            font-size: 2rem;
        }
        .about-section {
            background-color: var(--light-bg);
            padding: 6rem 0;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .portfolio-item {
            border-radius: 1rem;
            overflow: hidden;
            margin-bottom: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
        }
        .portfolio-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        .portfolio-img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.05);
        }
        .news-card {
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            overflow: hidden;
            height: 100%;
            transition: var(--transition);
        }
        .news-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
        }
        .news-date {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            object-fit: cover;
            border: 5px solid white;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 1.5rem;
        }
        .contact-info-item {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: var(--light-bg);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--primary-color);
            font-size: 1.2rem;
        }
        .footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
        }
        .friendlink {
            background-color: #f8fafc;
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.75rem 1.5rem;
            margin: 0.5rem;
            border-radius: 0.5rem;
            border: 1px solid var(--border-color);
            color: var(--text-dark);
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .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;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-dark);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .navbar-nav .nav-link {
                margin: 0.25rem 0;
                padding: 0.75rem 1rem !important;
            }
        }