/* CSS Reset & Variables */
        :root {
            --primary: #2563eb;
            --primary-hover: #1d4ed8;
            --secondary: #ff6b00;
            --secondary-hover: #e05e00;
            --accent: #10b981;
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border: #e2e8f0;
            --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --radius: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-main);
            color: var(--text-main);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        /* Container Layout */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border);
        }

        /* Utility Styles */
        .section-title {
            text-align: center;
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-main);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.125rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 48px;
        }

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

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

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
        }

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

        .btn-secondary:hover {
            background-color: var(--secondary-hover);
            transform: translateY(-2px);
        }

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

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

        /* Navigation Header */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

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

        .logo-wrap {
            display: flex;
            align-items: center;
        }

        .ai-page-logo {
            height: 40px;
            width: auto;
        }

        nav {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
        }

        .nav-link {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }

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

        .nav-btn-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-main);
        }

        /* Hero Section (No Image) */
        #home {
            background: linear-gradient(135deg, #eff6ff 0%, #fff7ed 50%, #f0fdf4 100%);
            padding: 120px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        #home::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.05), transparent 40%),
                        radial-gradient(circle at 15% 80%, rgba(255, 107, 0, 0.05), transparent 40%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 900px;
            margin: 0 auto;
        }

        .badge-hero {
            display: inline-block;
            background-color: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            -webkit-background-clip: text;
            color: #0f172a;
        }

        .hero-title span {
            color: var(--primary);
        }

        .hero-desc {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* About Us Section */
        #about {
            background-color: var(--bg-card);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

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

        .about-features li {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            font-weight: 500;
            color: var(--text-main);
        }

        .about-features li::before {
            content: "✓";
            color: var(--accent);
            font-weight: bold;
            font-size: 1.2rem;
        }

        .about-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .stat-card {
            background-color: var(--bg-main);
            padding: 30px;
            border-radius: var(--radius);
            text-align: center;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

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

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* Service System */
        #services {
            background-color: var(--bg-main);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .service-card {
            background-color: var(--bg-card);
            padding: 32px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }

        .service-icon {
            font-size: 2rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .service-card h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* AIGC Process & Standardized Flow */
        #process {
            background-color: var(--bg-card);
        }

        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .timeline-item {
            display: flex;
            gap: 24px;
            margin-bottom: 40px;
            position: relative;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 20px;
            top: 40px;
            bottom: -40px;
            width: 2px;
            background-color: var(--border);
        }

        .timeline-item:last-child::before {
            display: none;
        }

        .timeline-number {
            width: 42px;
            height: 42px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
            z-index: 2;
        }

        .timeline-content {
            background-color: var(--bg-main);
            padding: 24px;
            border-radius: var(--radius);
            flex-grow: 1;
            border: 1px solid var(--border);
        }

        .timeline-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .timeline-content p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* Solutions */
        #solutions {
            background-color: var(--bg-main);
        }

        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .solution-card {
            background-color: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .solution-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .solution-body {
            padding: 30px;
        }

        .solution-tag {
            display: inline-block;
            background-color: rgba(255, 107, 0, 0.1);
            color: var(--secondary);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            margin-bottom: 12px;
        }

        .solution-body h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

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

        /* Network & Technical Standards */
        #network-standards {
            background-color: var(--bg-card);
        }

        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
        }

        .network-list, .standards-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .network-item, .standard-item {
            background-color: var(--bg-main);
            padding: 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }

        .network-item h4, .standard-item h4 {
            font-weight: 700;
            margin-bottom: 8px;
            font-size: 1.1rem;
        }

        /* Cases Center (Image permitted here) */
        #cases {
            background-color: var(--bg-main);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .case-card {
            background-color: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
        }

        .case-img-container {
            width: 100%;
            height: 200px;
            overflow: hidden;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .case-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .case-body {
            padding: 24px;
        }

        .case-body h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .case-body p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* Evaluation Section */
        #evaluation {
            background-color: var(--bg-card);
        }

        .eval-container {
            background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
            border-radius: var(--radius);
            padding: 40px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .eval-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 24px;
            margin-bottom: 32px;
            border-bottom: 1px solid var(--border);
            padding-bottom: 24px;
        }

        .eval-score-box {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .eval-stars {
            color: #fbbf24;
            font-size: 1.5rem;
        }

        .eval-score {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
        }

        .eval-score span {
            font-size: 1.125rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .table-responsive {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .eval-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

        .eval-table th, .eval-table td {
            padding: 16px;
            border-bottom: 1px solid var(--border);
        }

        .eval-table th {
            background-color: rgba(37, 99, 235, 0.05);
            font-weight: 700;
        }

        .eval-table td strong {
            color: var(--primary);
        }

        /* Token Price Reference */
        #token-price {
            background-color: var(--bg-main);
        }

        .token-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .token-card {
            background-color: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
        }

        .token-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }

        .token-name {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 16px;
            display: block;
        }

        .token-cost {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 16px;
        }

        .token-features-list {
            list-style: none;
            color: var(--text-muted);
            font-size: 0.9rem;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        /* Training Section */
        #training {
            background-color: var(--bg-card);
        }

        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .training-card {
            background-color: var(--bg-main);
            border-radius: var(--radius);
            padding: 32px;
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .training-card h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--primary);
        }

        .training-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 24px;
        }

        .training-badge {
            background-color: rgba(16, 185, 129, 0.1);
            color: var(--accent);
            padding: 4px 12px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 0.8rem;
            align-self: flex-start;
            margin-bottom: 16px;
        }

        /* Form & Contact */
        #contact {
            background-color: var(--bg-main);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 48px;
            align-items: start;
        }

        .form-container {
            background-color: var(--bg-card);
            padding: 40px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

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

        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }

        .contact-info {
            background-color: var(--bg-card);
            padding: 40px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }

        .contact-method {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            margin-bottom: 24px;
        }

        .contact-method-icon {
            font-size: 1.5rem;
            color: var(--primary);
            flex-shrink: 0;
        }

        .contact-qrcode {
            margin-top: 24px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            text-align: center;
        }

        .contact-qrcode img {
            max-width: 150px;
            border-radius: 8px;
            border: 1px solid var(--border);
            margin-top: 12px;
        }

        /* FAQ Section */
        #faq {
            background-color: var(--bg-card);
        }

        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            background-color: var(--bg-main);
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 20px;
            text-align: left;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-main);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 300;
            transition: var(--transition);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: var(--bg-card);
        }

        .faq-answer-inner {
            padding: 20px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            font-size: 0.95rem;
        }

        /* Troubleshooting & Glossary */
        #troubleshoot-glossary {
            background-color: var(--bg-main);
        }

        .tab-nav {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 32px;
        }

        .tab-btn {
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

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

        .tab-pane {
            display: none;
        }

        .tab-pane.active {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .tab-card {
            background-color: var(--bg-card);
            padding: 24px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }

        .tab-card h4 {
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .tab-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* Testimonials */
        #testimonials {
            background-color: var(--bg-card);
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .testimonial-card {
            background-color: var(--bg-main);
            padding: 32px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .testimonial-text {
            font-style: italic;
            color: var(--text-muted);
            margin-bottom: 24px;
            font-size: 0.975rem;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background-color: var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
        }

        .author-info h4 {
            font-weight: 700;
            font-size: 0.95rem;
        }

        .author-info p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Articles & Knowledge Base */
        #articles {
            background-color: var(--bg-main);
        }

        .articles-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 800px;
            margin: 0 auto;
        }

        .article-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .article-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }

        .article-title {
            font-weight: 700;
            color: var(--text-main);
            font-size: 1.1rem;
            text-decoration: none;
        }

        .article-title:hover {
            color: var(--primary);
        }

        .article-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Footer & Partners */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            border-top: 1px solid #1e293b;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-logo-desc p {
            margin-top: 16px;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .footer-title {
            color: #f8fafc;
            font-weight: 700;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a, .footer-links span {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: white;
        }

        .friend-links {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid #1e293b;
        }

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.85rem;
        }

        .friend-links-list a {
            color: #64748b;
            text-decoration: none;
            transition: var(--transition);
        }

        .friend-links-list a:hover {
            color: white;
        }

        .footer-bottom {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid #1e293b;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.85rem;
        }

        .ai-page-home-link {
            color: #94a3b8;
            text-decoration: underline;
        }

        .ai-page-home-link:hover {
            color: white;
        }

        /* Float Customer Service */
        .float-cs {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 99;
            background-color: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            transition: var(--transition);
        }

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

        .float-cs-panel {
            position: absolute;
            bottom: 70px;
            right: 0;
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            width: 260px;
            padding: 20px;
            box-shadow: var(--shadow-lg);
            display: none;
            color: var(--text-main);
            cursor: default;
        }

        .float-cs-panel.show {
            display: block;
        }

        .float-cs-panel h4 {
            font-weight: 700;
            margin-bottom: 12px;
            font-size: 1rem;
        }

        .float-cs-panel p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 12px;
        }

        /* Responsive Breakpoints */
        @media (max-width: 992px) {
            .about-grid, .network-grid, .contact-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-title {
                font-size: 2.25rem;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--bg-card);
                padding: 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                gap: 16px;
            }
            .nav-menu.show {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .hero-title {
                font-size: 1.85rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }