/* CSS Reset & Variables */
        :root {
            --primary: #ff5722; /* 鲜活橙色 */
            --primary-hover: #e64a19;
            --secondary: #007bff; /* 科技蓝色 */
            --secondary-hover: #0056b3;
            --accent: #ffeb3b; /* 活力黄色 */
            --dark: #212529;
            --light: #f8fafc;
            --white: #ffffff;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-600: #475569;
            --gray-800: #1e293b;
            --border-radius: 12px;
            --box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--gray-800);
            background-color: var(--light);
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Layout Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Common Typography */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 2.2rem;
            color: var(--dark);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            width: 50%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            position: absolute;
            bottom: -8px;
            left: 25%;
            border-radius: 2px;
        }

        .section-title p {
            font-size: 1.1rem;
            color: var(--gray-600);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 30px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            gap: 8px;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--white);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255,87,34,0.4);
        }

        .btn-secondary {
            background-color: var(--secondary);
            color: var(--white);
        }

        .btn-secondary:hover {
            background-color: var(--secondary-hover);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,123,255,0.4);
        }

        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--secondary);
            color: var(--secondary);
        }

        .btn-outline:hover {
            background-color: var(--secondary);
            color: var(--white);
        }

        /* Header Navigation */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--gray-200);
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

        .logo-box {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-box img {
            height: 40px;
            width: auto;
        }

        .logo-box span {
            font-size: 1.4rem;
            font-weight: 800;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 20px;
            align-items: center;
        }

        .nav-menu a {
            color: var(--gray-800);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .nav-menu a:hover {
            color: var(--primary);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .nav-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* Hero Section (No Images allowed here) */
        .hero-section {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, #fff9f6 0%, #f0f7ff 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -20%;
            left: -10%;
            width: 40%;
            height: 60%;
            background: radial-gradient(circle, rgba(255,87,34,0.1) 0%, rgba(255,255,255,0) 70%);
            z-index: 1;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            right: -10%;
            width: 50%;
            height: 70%;
            background: radial-gradient(circle, rgba(0,123,255,0.08) 0%, rgba(255,255,255,0) 70%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            background-color: rgba(255,87,34,0.1);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 2.8rem;
            line-height: 1.25;
            color: var(--dark);
            margin-bottom: 20px;
            font-weight: 850;
        }

        .hero-title span {
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.2rem;
            color: var(--gray-600);
            margin-bottom: 35px;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        /* 2. About Us Section */
        .about-section {
            background-color: var(--white);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--dark);
        }

        .about-text p {
            margin-bottom: 15px;
            color: var(--gray-600);
        }

        /* Data Cards (Part of About/Hero transition) */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .stat-card {
            background-color: var(--light);
            padding: 25px;
            border-radius: var(--border-radius);
            text-align: center;
            box-shadow: var(--box-shadow);
            border: 1px solid var(--gray-200);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--gray-600);
        }

        /* 3. AIGC Service System */
        .service-section {
            background-color: var(--light);
        }

        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .service-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border-top: 4px solid var(--secondary);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }

        .service-card h3 {
            font-size: 1.25rem;
            margin: 15px 0 10px;
            color: var(--dark);
        }

        .service-card p {
            font-size: 0.95rem;
            color: var(--gray-600);
            margin-bottom: 15px;
        }

        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .tag-list span {
            background-color: var(--gray-100);
            color: var(--gray-800);
            font-size: 0.75rem;
            padding: 4px 8px;
            border-radius: 4px;
        }

        /* 4. AIGC Process */
        .process-section {
            background-color: var(--white);
        }

        .process-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .process-step {
            text-align: center;
            position: relative;
            background: var(--light);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        .step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 15px;
        }

        .process-step h4 {
            margin-bottom: 10px;
            color: var(--dark);
        }

        .process-step p {
            font-size: 0.9rem;
            color: var(--gray-600);
        }

        .process-banner {
            margin-top: 40px;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }

        .process-banner img {
            width: 100%;
            display: block;
            object-fit: cover;
            max-height: 400px;
        }

        /* 5. Solutions */
        .solutions-section {
            background-color: var(--light);
        }

        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 30px;
        }

        .solution-card {
            background: var(--white);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }

        .solution-card:hover {
            transform: translateY(-5px);
        }

        .solution-body {
            padding: 30px;
        }

        .solution-body h3 {
            font-size: 1.3rem;
            color: var(--dark);
            margin-bottom: 15px;
        }

        .solution-body p {
            color: var(--gray-600);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .solution-features {
            list-style: none;
        }

        .solution-features li {
            font-size: 0.9rem;
            color: var(--gray-800);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .solution-features li::before {
            content: '✓';
            color: var(--primary);
            font-weight: bold;
        }

        /* 6. Service Network */
        .network-section {
            background-color: var(--white);
            text-align: center;
        }

        .network-map-placeholder {
            background: linear-gradient(135deg, #eef2f7 0%, #e2e8f0 100%);
            border-radius: var(--border-radius);
            padding: 50px;
            position: relative;
            overflow: hidden;
            margin-top: 30px;
        }

        .network-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .network-node {
            background: var(--white);
            padding: 20px;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
        }

        .network-node h4 {
            color: var(--secondary);
            margin-bottom: 5px;
        }

        /* 7. Standardized Process & 8. Technical Standards */
        .standards-section {
            background-color: var(--light);
        }

        .standards-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .timeline {
            position: relative;
            padding-left: 30px;
            border-left: 2px solid var(--gray-200);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 25px;
        }

        .timeline-item::before {
            content: '';
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--primary);
            position: absolute;
            left: -37px;
            top: 6px;
            border: 2px solid var(--white);
        }

        .timeline-item h4 {
            margin-bottom: 5px;
            color: var(--dark);
        }

        .timeline-item p {
            font-size: 0.9rem;
            color: var(--gray-600);
        }

        .tech-box {
            background-color: var(--white);
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        .tech-item {
            margin-bottom: 20px;
        }

        .tech-item h4 {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            color: var(--dark);
        }

        .progress-bar {
            height: 8px;
            background-color: var(--gray-200);
            border-radius: 4px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--secondary), var(--primary));
            border-radius: 4px;
        }

        /* 9. Case Center */
        .cases-section {
            background-color: var(--white);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }

        .case-card {
            background: var(--light);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
        }

        .case-img-box {
            position: relative;
            overflow: hidden;
        }

        .case-img-box img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            display: block;
        }

        .case-badge {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: var(--primary);
            color: var(--white);
            padding: 4px 10px;
            font-size: 0.75rem;
            border-radius: 4px;
            font-weight: 600;
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 1.1rem;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .case-info p {
            font-size: 0.9rem;
            color: var(--gray-600);
        }

        /* 10. Comparison & Evaluation */
        .evaluation-section {
            background: linear-gradient(135deg, #fff9f6 0%, #f0f7ff 100%);
        }

        .eval-summary {
            background-color: var(--white);
            border-radius: var(--border-radius);
            padding: 40px;
            box-shadow: var(--box-shadow);
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 40px;
            border: 1px solid rgba(255, 87, 34, 0.1);
        }

        .eval-rating {
            text-align: center;
        }

        .eval-score {
            font-size: 4rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
        }

        .eval-stars {
            color: #ffc107;
            font-size: 1.5rem;
            margin-top: 10px;
        }

        .eval-title {
            font-size: 1.8rem;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .eval-desc {
            color: var(--gray-600);
            max-width: 600px;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        th, td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--gray-200);
        }

        th {
            background-color: var(--gray-100);
            color: var(--dark);
            font-weight: 600;
        }

        tr:last-child td {
            border-bottom: none;
        }

        .highlight-row {
            background-color: rgba(255, 87, 34, 0.02);
        }

        .highlight-cell {
            color: var(--primary);
            font-weight: 600;
        }

        /* 11. Smart Requirements & 12. Token Price Comparison */
        .tools-section {
            background-color: var(--white);
        }

        .tools-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .tool-card {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: var(--box-shadow);
            border: 1px solid var(--gray-200);
        }

        .tool-card h3 {
            margin-bottom: 20px;
            color: var(--dark);
            font-size: 1.4rem;
        }

        .token-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .token-item {
            background: var(--white);
            padding: 12px 20px;
            border-radius: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-left: 4px solid var(--primary);
        }

        .token-name {
            font-weight: 600;
            color: var(--dark);
        }

        .token-price {
            color: var(--primary);
            font-weight: 700;
        }

        /* 13. Vocational Training & 14. AI Training */
        .training-section {
            background-color: var(--light);
        }

        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .training-card {
            background-color: var(--white);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            border-bottom: 4px solid var(--secondary);
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            transform: translateY(-5px);
            border-bottom-color: var(--primary);
        }

        .training-card h4 {
            font-size: 1.1rem;
            color: var(--dark);
            margin: 15px 0 10px;
        }

        .training-card p {
            font-size: 0.85rem;
            color: var(--gray-600);
        }

        /* 15. Help Center & 16. FAQ Section */
        .faq-section {
            background-color: var(--white);
        }

        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .faq-accordion {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            border: 1px solid var(--gray-200);
            border-radius: var(--border-radius);
            overflow: hidden;
            background-color: var(--light);
        }

        .faq-question {
            padding: 18px 20px;
            background-color: var(--white);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            user-select: none;
            color: var(--dark);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: var(--transition);
            padding: 0 20px;
            color: var(--gray-600);
            font-size: 0.95rem;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 15px 20px;
        }

        /* 17. Self-Troubleshooting & 18. Glossary */
        .help-panel {
            background-color: var(--white);
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--box-shadow);
        }

        .help-panel h3 {
            margin-bottom: 15px;
            color: var(--dark);
        }

        .trouble-list, .terms-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .trouble-item, .term-item {
            padding: 12px;
            border-radius: 6px;
            background-color: var(--light);
        }

        .trouble-item strong, .term-item strong {
            color: var(--secondary);
            display: block;
            margin-bottom: 4px;
        }

        /* 19. Articles & Knowledge Base */
        .news-section {
            background-color: var(--light);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .news-card {
            background-color: var(--white);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 20px;
        }

        .news-card h4 {
            font-size: 1rem;
            color: var(--dark);
            margin-bottom: 15px;
        }

        .news-card a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .news-card a:hover {
            color: var(--primary-hover);
        }

        /* 6 User Reviews Section */
        .reviews-section {
            background-color: var(--white);
        }

        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .review-card {
            background-color: var(--light);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            border-left: 4px solid var(--primary);
        }

        .review-text {
            font-style: italic;
            color: var(--gray-600);
            margin-bottom: 15px;
            font-size: 0.95rem;
        }

        .review-user {
            font-weight: 600;
            color: var(--dark);
            font-size: 0.9rem;
        }

        .review-role {
            font-size: 0.8rem;
            color: var(--gray-600);
        }

        /* 20. Contact Us & Submission Form */
        .contact-section {
            background-color: var(--light);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .contact-form-box {
            background-color: var(--white);
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--gray-200);
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255,87,34,0.1);
        }

        .contact-info-box {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .info-card {
            background-color: var(--white);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            text-align: center;
        }

        .info-card img {
            max-width: 140px;
            margin-top: 15px;
            border-radius: 8px;
        }

        /* Footer */
        footer {
            background-color: var(--gray-800);
            color: var(--white);
            padding: 60px 0 20px;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--white);
            margin-bottom: 20px;
            font-size: 1.1rem;
            position: relative;
        }

        .footer-col h4::after {
            content: '';
            width: 30px;
            height: 2px;
            background-color: var(--primary);
            position: absolute;
            bottom: -6px;
            left: 0;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: var(--gray-200);
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            border-top: 1px solid var(--gray-600);
            padding-top: 20px;
            text-align: center;
            color: var(--gray-200);
            font-size: 0.8rem;
        }

        .footer-bottom p {
            margin-bottom: 10px;
        }

        .friend-links {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
            margin-top: 10px;
        }

        .friend-links a {
            color: var(--gray-200);
            text-decoration: none;
            font-size: 0.8rem;
        }

        .friend-links a:hover {
            color: var(--primary);
        }

        /* Floating Widgets */
        .floating-widgets {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            z-index: 999;
        }

        .widget-btn {
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            position: relative;
        }

        .widget-btn:hover {
            background-color: var(--primary-hover);
            transform: scale(1.1);
        }

        .widget-qr-popover {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--white);
            padding: 15px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            display: none;
            text-align: center;
            border: 1px solid var(--gray-200);
        }

        .widget-qr-popover img {
            width: 120px;
            height: 120px;
        }

        .widget-btn:hover .widget-qr-popover {
            display: block;
        }

        .back-to-top {
            background-color: var(--secondary);
            display: none;
        }

        .back-to-top:hover {
            background-color: var(--secondary-hover);
        }

        /* Responsive Styles */
        @media (max-width: 1024px) {
            .about-grid, .standards-grid, .tools-grid, .faq-grid, .contact-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .cases-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--white);
                padding: 20px;
                border-bottom: 1px solid var(--gray-200);
                box-shadow: var(--box-shadow);
            }

            .nav-menu.active {
                display: flex;
            }

            .nav-toggle {
                display: flex;
            }

            .hero-title {
                font-size: 2.2rem;
            }

            .stats-grid, .process-flow, .cases-grid, .reviews-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }