/* CSS Reset & Variables */
        :root {
            --primary: #4F46E5;
            --primary-light: #818CF8;
            --accent: #06B6D4;
            --accent-pink: #EC4899;
            --text-main: #0F172A;
            --text-muted: #475569;
            --bg-base: #FFFFFF;
            --bg-offset: #F8FAFC;
            --border-color: #E2E8F0;
            --border-hover: #CBD5E1;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            font-family: var(--font-main);
            color: var(--text-main);
            background-color: var(--bg-base);
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

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

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

        /* Common Section Styling */
        section {
            padding: 96px 0;
            position: relative;
        }
        
        .section-offset {
            background-color: var(--bg-offset);
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-title h2 {
            font-size: 2.25rem;
            font-weight: 800;
            letter-spacing: -0.025em;
            color: var(--text-main);
            margin-bottom: 16px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
        }

        .section-title p {
            font-size: 1.125rem;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
        }

        /* Buttons & Badges */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            font-size: 1rem;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
        }

        .btn-secondary {
            background-color: #ffffff;
            border-color: var(--border-color);
            color: var(--text-main);
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .badge {
            display: inline-block;
            padding: 6px 12px;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--primary);
            background-color: rgba(79, 70, 229, 0.08);
            border-radius: 30px;
            margin-bottom: 12px;
        }

        /* Header Navigation */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

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

        .brand-text {
            font-size: 1.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent-pink));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
        }

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

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

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

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }

        /* Hero Section (No Images Constraint Met) */
        .hero {
            position: relative;
            padding: 120px 0 100px 0;
            background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.08) 0%, transparent 50%);
            border-bottom: 1px solid var(--border-color);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            line-height: 1.15;
            font-weight: 900;
            letter-spacing: -0.03em;
            margin-bottom: 24px;
        }

        .hero-content h1 span {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--accent-pink) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-content p {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 36px;
            max-width: 600px;
        }

        .hero-cta {
            display: flex;
            gap: 16px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }

        .hero-decor-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.05);
            position: relative;
            overflow: hidden;
        }

        .hero-decor-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-pink));
        }

        .decor-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-main);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }

        .tag-item {
            padding: 4px 10px;
            background-color: var(--bg-offset);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* Data Indicators Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 24px;
        }

        .stat-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: var(--radius-md);
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* About Us Section */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.75rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

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

        .about-img-box {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.06);
        }

        /* Services System Section */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .service-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px;
            transition: var(--transition);
            position: relative;
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 16px 32px rgba(79, 70, 229, 0.05);
            border-color: var(--primary-light);
        }

        .service-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(6,182,212,0.1));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            color: var(--primary);
        }

        .service-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

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

        /* Workflow Step Cards */
        .workflow-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .workflow-step {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            position: relative;
            transition: var(--transition);
        }

        .workflow-step:hover {
            border-color: var(--accent);
        }

        .step-num {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 2rem;
            font-weight: 900;
            color: rgba(79, 70, 229, 0.1);
        }

        .workflow-step h3 {
            margin-bottom: 12px;
            font-size: 1.15rem;
            padding-right: 32px;
        }

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

        /* Solutions Grid */
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .solution-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        }

        .solution-img-box {
            height: 200px;
            overflow: hidden;
            background-color: var(--bg-offset);
        }

        .solution-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .solution-info {
            padding: 24px;
        }

        .solution-info h3 {
            font-size: 1.25rem;
            margin-bottom: 8px;
        }

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

        /* Service Network & Standardized service */
        .network-section {
            background-color: var(--text-main);
            color: #ffffff;
        }

        .network-section .section-title h2 {
            color: #ffffff;
        }

        .network-section .section-title p {
            color: #94A3B8;
        }

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

        .map-mock {
            border: 1px solid #334155;
            background-color: #1E293B;
            border-radius: var(--radius-lg);
            padding: 40px;
            text-align: center;
        }

        .city-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 24px;
        }

        .city-tag {
            padding: 8px 16px;
            background-color: #0F172A;
            border: 1px solid #334155;
            color: #94A3B8;
            border-radius: 30px;
            font-size: 0.85rem;
        }

        /* Technical Standards */
        .specs-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .spec-item {
            padding: 24px;
            border-radius: var(--radius-sm);
            border-left: 4px solid var(--accent);
            background-color: var(--bg-offset);
        }

        .spec-item h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }

        .spec-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        /* Cases Center */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .case-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background-color: #ffffff;
            display: flex;
            flex-direction: column;
        }

        .case-img-box {
            position: relative;
            background-color: var(--bg-offset);
            aspect-ratio: 16/9;
            overflow: hidden;
        }

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

        .case-meta {
            padding: 24px;
            flex-grow: 1;
        }

        .case-meta h4 {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .case-tags {
            display: flex;
            gap: 8px;
            margin-bottom: 12px;
        }

        /* Review and Compare Section */
        .eval-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 48px;
        }

        .eval-rating {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            padding: 48px;
            border-radius: var(--radius-lg);
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .eval-score {
            font-size: 5rem;
            font-weight: 900;
            line-height: 1;
            margin-bottom: 12px;
        }

        .eval-stars {
            font-size: 1.75rem;
            color: #FBBF24;
            margin-bottom: 16px;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background-color: #ffffff;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 0.9rem;
        }

        .compare-table th, .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .compare-table th {
            background-color: var(--bg-offset);
            font-weight: 700;
        }

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

        /* Token Pricing */
        .pricing-section {
            background-color: var(--bg-offset);
        }

        /* Training Sections */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }

        .training-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            border-color: var(--accent-pink);
            transform: translateY(-4px);
        }

        .training-card h3 {
            font-size: 1rem;
            margin-bottom: 8px;
            font-weight: 700;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            background-color: #ffffff;
        }

        .faq-question {
            width: 100%;
            padding: 20px 24px;
            background: none;
            border: none;
            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:hover {
            background-color: var(--bg-offset);
        }

        .faq-icon {
            font-size: 1.25rem;
            transition: transform 0.2s ease;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            background-color: var(--bg-offset);
        }

        .faq-answer-inner {
            padding: 20px 24px;
            font-size: 0.95rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-color);
        }

        .faq-item.active .faq-answer {
            max-height: 1000px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }

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

        /* Self Diagnostic / Checklist */
        .diagnostic-box {
            max-width: 800px;
            margin: 0 auto 48px auto;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background-color: #ffffff;
            padding: 32px;
        }

        .diagnostic-step {
            margin-bottom: 24px;
        }

        .diagnostic-step:last-child {
            margin-bottom: 0;
        }

        /* Terms / Glossary Section */
        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .glossary-card {
            padding: 24px;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
        }

        .glossary-card strong {
            display: block;
            margin-bottom: 8px;
            color: var(--primary);
        }

        /* Testimonials / User Reviews */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .review-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            position: relative;
        }

        .review-quote {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
            font-style: italic;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .user-avatar {
            width: 40px;
            height: 40px;
            background-color: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-weight: 700;
        }

        .user-info h5 {
            font-size: 0.95rem;
            font-weight: 700;
        }

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

        /* Articles & Knowledge Base */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .article-card {
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 24px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .article-card h4 {
            font-size: 1.15rem;
        }

        .article-card a {
            text-decoration: none;
            color: var(--text-main);
            transition: var(--transition);
        }

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

        .article-date {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Form Section */
        .form-wrapper {
            max-width: 640px;
            margin: 0 auto;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            outline: none;
            font-family: inherit;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }

        /* Footer & Friend Links */
        footer {
            background-color: #0F172A;
            color: #94A3B8;
            padding: 80px 0 32px 0;
            border-top: 1px solid #1E293B;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 48px;
            margin-bottom: 48px;
        }

        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .footer-brand p {
            font-size: 0.9rem;
        }

        .footer-links-col h4 {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .footer-links-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links-col a {
            color: #94A3B8;
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .footer-links-col a:hover {
            color: #ffffff;
        }

        .qr-area {
            display: flex;
            gap: 16px;
            align-items: center;
        }

        .qr-box {
            width: 100px;
            height: 100px;
            background-color: #ffffff;
            padding: 4px;
            border-radius: var(--radius-sm);
        }

        .qr-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .friend-links {
            border-top: 1px solid #1E293B;
            padding: 24px 0;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.85rem;
        }

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

        .friend-links a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            font-size: 0.8rem;
            color: #64748B;
        }

        /* Float Sidebar widgets */
        .float-widget {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 99;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .widget-item {
            width: 48px;
            height: 48px;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 50%;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }

        .widget-item:hover {
            background-color: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
        }

        .widget-tooltip {
            position: absolute;
            right: 60px;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 12px;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
            white-space: nowrap;
            color: var(--text-main);
        }

        .widget-item:hover .widget-tooltip {
            opacity: 1;
            transform: translateX(-4px);
        }

        /* Mobile Responsive */
        @media (max-width: 1024px) {
            .hero-grid, .about-grid, .network-grid, .eval-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .workflow-timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .solution-grid, .specs-grid, .glossary-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px;
                left: 0;
                right: 0;
                background-color: #ffffff;
                border-bottom: 1px solid var(--border-color);
                padding: 24px;
                gap: 16px;
            }

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

            .menu-toggle {
                display: block;
            }

            .hero-content h1 {
                font-size: 2.5rem;
            }

            .workflow-timeline, .solution-grid, .specs-grid, .cases-grid, .glossary-grid, .reviews-grid, .training-grid, .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            
            section {
                padding: 64px 0;
            }
        }