:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --accent-color: #f59e0b;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: color 0.3s;
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.9) 0%, rgba(37, 99, 235, 0.8) 100%), url('https://images.unsplash.com/photo-1551434678-e076c223a692?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            color: var(--dark-color);
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--primary-color);
        }
        .section-title.text-center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #e5e7eb;
            transition: all 0.3s ease;
            height: 100%;
            background: white;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .service-card {
            border-radius: 12px;
            padding: 2rem;
            background: white;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            height: 100%;
            transition: transform 0.3s;
            border: 1px solid #e5e7eb;
        }
        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
        }
        .footer a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-weight: 600;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .flink {
            display: inline-block;
            padding: 8px 15px;
            margin: 5px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 6px;
            color: #d1d5db;
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }
        .contact-info li {
            margin-bottom: 12px;
            padding-left: 30px;
            position: relative;
        }
        .contact-info li i {
            position: absolute;
            left: 0;
            top: 5px;
            color: var(--primary-color);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .timeline-date {
            color: var(--primary-color);
            font-weight: 600;
            margin-bottom: 5px;
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            height: 100%;
            position: relative;
        }
        .testimonial-card:before {
            content: '"';
            position: absolute;
            top: 10px;
            left: 20px;
            font-size: 4rem;
            color: var(--primary-color);
            opacity: 0.2;
            font-family: Georgia, serif;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            margin-top: 20px;
        }
        .testimonial-author img {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 15px;
        }
        .news-card {
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #e5e7eb;
            transition: all 0.3s;
            height: 100%;
            background: white;
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--primary-color);
            color: white;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        .btn-primary {
            background: var(--primary-color);
            border: none;
            padding: 10px 25px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background: #1e40af;
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-outline-primary:hover {
            background: var(--primary-color);
            border-color: var(--primary-color);
        }
        .stats-counter {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #1e40af;
            color: white;
        }
        .breadcrumb {
            background-color: #f3f4f6;
            padding: 15px;
            border-radius: 8px;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 86, 219, 0.25);
        }
        .contact-form {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }
        .map-container {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            height: 100%;
        }
        .product-tabs .nav-link {
            color: var(--dark-color);
            font-weight: 600;
            padding: 12px 25px;
            border-radius: 8px 8px 0 0;
            margin-right: 5px;
        }
        .product-tabs .nav-link.active {
            background: var(--primary-color);
            color: white;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(26, 86, 219, 0.1);
            color: var(--primary-color);
            font-weight: 600;
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.25rem rgba(26, 86, 219, 0.25);
            border-color: var(--primary-color);
        }
        .pricing-card {
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            text-align: center;
            transition: all 0.3s;
            height: 100%;
            background: white;
        }
        .pricing-card.featured {
            border-color: var(--primary-color);
            transform: scale(1.05);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }
        .pricing-card.featured .pricing-header {
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            color: white;
            margin: -2.5rem -2rem 2rem;
            padding: 2rem;
            border-radius: 12px 12px 0 0;
        }
        .pricing-price {
            font-size: 3rem;
            font-weight: 800;
            color: var(--dark-color);
            margin: 1.5rem 0;
        }
        .pricing-card.featured .pricing-price {
            color: white;
        }
        .team-card {
            text-align: center;
            padding: 2rem;
            border-radius: 12px;
            transition: all 0.3s;
            background: white;
            border: 1px solid #e5e7eb;
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 20px;
            border: 5px solid #f3f4f6;
        }
        .certificate-item {
            text-align: center;
            padding: 1.5rem;
            border-radius: 12px;
            background: white;
            border: 1px solid #e5e7eb;
            transition: all 0.3s;
        }
        .certificate-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .certificate-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }