:root {
            --primary-color: #1a56db;
            --secondary-color: #7e3af2;
            --accent-color: #0ea5e9;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --text-color: #374151;
            --border-radius: 12px;
            --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1.2rem;
        }
        .section-title {
            position: relative;
            margin-bottom: 3.5rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .navbar {
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            background-color: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            transition: var(--transition);
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: rgba(26, 86, 219, 0.1);
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
            padding: 8rem 0 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section:before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: linear-gradient(90deg, rgba(26, 86, 219, 0.1), rgba(126, 58, 242, 0.1));
            top: -300px;
            right: -200px;
        }
        .hero-section:after {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: linear-gradient(90deg, rgba(14, 165, 233, 0.1), rgba(26, 86, 219, 0.1));
            bottom: -200px;
            left: -100px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .btn-primary {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 0.8rem 2rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(26, 86, 219, 0.35);
        }
        .card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .card-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
            color: white;
        }
        .service-card {
            padding: 2.5rem 2rem;
            text-align: center;
        }
        .feature-box {
            padding: 2.5rem;
            border-radius: var(--border-radius);
            background-color: white;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .feature-box:hover {
            transform: translateY(-5px);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1;
        }
        .portfolio-item {
            border-radius: var(--border-radius);
            overflow: hidden;
            position: relative;
            box-shadow: var(--box-shadow);
            margin-bottom: 2rem;
        }
        .portfolio-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
            color: white;
            padding: 2rem;
            transform: translateY(20px);
            opacity: 0;
            transition: var(--transition);
        }
        .portfolio-item:hover .portfolio-overlay {
            transform: translateY(0);
            opacity: 1;
        }
        .testimonial-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            box-shadow: var(--box-shadow);
            position: relative;
            margin: 1.5rem 0;
        }
        .testimonial-card:before {
            content: '"';
            position: absolute;
            top: 20px;
            left: 25px;
            font-size: 5rem;
            color: rgba(26, 86, 219, 0.1);
            font-family: Georgia, serif;
        }
        .client-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--primary-color);
        }
        .contact-info-box {
            padding: 2rem;
            border-radius: var(--border-radius);
            background-color: white;
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
            height: 100%;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 1.8rem;
            color: white;
        }
        .form-control, .form-select {
            padding: 0.9rem 1.2rem;
            border-radius: var(--border-radius);
            border: 1px solid #d1d5db;
            transition: var(--transition);
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
        }
        footer {
            background-color: var(--dark-color);
            color: #d1d5db;
            padding-top: 4rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #9ca3af;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #374151;
            padding: 1.5rem 0;
            margin-top: 3rem;
            font-size: 0.9rem;
            color: #9ca3af;
        }
        .friendlink {
            background-color: #f8fafc;
            padding: 4rem 0;
        }
        .flink {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 1rem 1.5rem;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin: 0.5rem;
            color: var(--text-color);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            min-width: 160px;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            color: var(--primary-color);
        }
        .flink i {
            margin-right: 10px;
            font-size: 1.2rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(26, 86, 219, 0.3);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            color: white;
        }
        .animated-element {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .animated-element.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .loading-spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
            margin-right: 10px;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        .news-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            background-color: white;
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
            padding-left: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: 3px solid white;
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
        }