/* CSS Reset & Variables */
        :root {
            --primary: #6366f1; /* Indigo */
            --primary-glow: rgba(99, 102, 241, 0.15);
            --secondary: #ec4899; /* Pink */
            --accent: #06b6d4; /* Cyan */
            --dark: #0f172a; /* Slate 900 */
            --light-bg: #f8fafc; /* Slate 50 */
            --card-bg: #ffffff;
            --text-main: #334155; /* Slate 700 */
            --text-heading: #1e293b; /* Slate 800 */
            --border-color: #e2e8f0; /* Slate 200 */
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --gradient-vibrant: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--light-bg);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Common Layout & Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        section {
            padding: 5rem 0;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-heading);
            font-weight: 700;
            line-height: 1.3;
        }

        p {
            margin-bottom: 1rem;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--secondary);
        }

        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            display: block;
        }

        /* Buttons & Badges */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.75rem;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 9999px;
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            text-align: center;
        }

        .btn-gradient {
            background: var(--gradient-vibrant);
            color: #ffffff;
            background-size: 200% auto;
        }

        .btn-gradient:hover {
            background-position: right center;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(99, 102, 241, 0.25);
        }

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

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

        .badge-rainbow {
            background: var(--gradient-vibrant);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            display: inline-block;
            margin-bottom: 0.5rem;
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 3.5rem auto;
        }

        .section-header h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--gradient-vibrant);
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-main);
            font-size: 1.1rem;
        }

        /* 1. Header & Navigation */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: var(--transition);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 4.5rem;
        }

        .logo-box {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo-box img {
            max-height: 2.2rem;
            width: auto;
        }

        .logo-text {
            font-size: 1.3rem;
            font-weight: 800;
            background: var(--gradient-vibrant);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            gap: 1.5rem;
            list-style: none;
            align-items: center;
        }

        .nav-link {
            color: var(--text-heading);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 0.5rem 0.2rem;
            position: relative;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-vibrant);
            transition: var(--transition);
        }

        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

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

        /* 2. Hero Section (NO IMAGES AS PER CONSTRAINT) */
        .hero {
            padding-top: 8rem;
            padding-bottom: 6rem;
            background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.05) 0%, rgba(236, 72, 153, 0.05) 90.2%);
            text-align: center;
            overflow: hidden;
        }

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

        .hero h1 {
            font-size: 3rem;
            letter-spacing: -0.02em;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, #1e293b 30%, #6366f1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-sub {
            font-size: 1.25rem;
            color: var(--text-main);
            margin-bottom: 2.5rem;
            max-width: 750px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-btn-group {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
            margin-bottom: 3.5rem;
        }

        /* Glassmorphism Data Cards in Hero (No Images) */
        .hero-features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .hero-feature-card {
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.9);
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
            backdrop-filter: blur(5px);
            transition: var(--transition);
        }

        .hero-feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(99, 102, 241, 0.1);
            border-color: var(--primary);
        }

        .hero-feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
            color: var(--primary);
        }

        .hero-feature-card p {
            font-size: 0.85rem;
            margin-bottom: 0;
            color: var(--text-main);
        }

        /* 3. About Us */
        .about {
            background-color: var(--card-bg);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 1.2rem;
        }

        .about-text p {
            margin-bottom: 1.2rem;
            color: var(--text-main);
            text-align: justify;
        }

        .about-points {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .about-point-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            color: var(--text-heading);
        }

        .about-point-item svg {
            color: var(--accent);
            flex-shrink: 0;
        }

        /* Software/Platform introduction visualization */
        .software-display {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(6, 182, 212, 0.05));
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2.5rem;
            position: relative;
        }

        .software-tag {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: rgba(6, 182, 212, 0.1);
            color: var(--accent);
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 700;
        }

        .software-ui-mock {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .mock-bar {
            height: 12px;
            border-radius: 6px;
            background: #e2e8f0;
        }

        .mock-bar.gradient {
            background: var(--gradient-vibrant);
            width: 75%;
        }

        .mock-card-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0.75rem;
            margin-top: 1rem;
        }

        .mock-card {
            background: white;
            padding: 0.75rem;
            border-radius: 8px;
            font-size: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
        }

        /* 4. AIGC Service System */
        .service-system {
            background-color: var(--light-bg);
        }

        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .service-card {
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2rem;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border-color: var(--primary);
        }

        .service-icon {
            width: 3rem;
            height: 3rem;
            border-radius: 12px;
            background: var(--gradient-vibrant);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            margin-bottom: 1.5rem;
        }

        .service-card h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

        .service-card ul {
            list-style: none;
            margin-top: 1rem;
        }

        .service-card li {
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .service-card li::before {
            content: '✦';
            color: var(--secondary);
        }

        /* Platforms Cloud / Tag Cloud */
        .platforms-cloud {
            margin-top: 3.5rem;
            text-align: center;
            background: white;
            padding: 2.5rem;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

        .platforms-cloud h4 {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            color: var(--text-heading);
            letter-spacing: 0.05em;
        }

        .cloud-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.6rem;
        }

        .tag {
            background-color: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 0.4rem 0.9rem;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-main);
            transition: var(--transition);
        }

        .tag:hover {
            background: var(--gradient-vibrant);
            color: #ffffff;
            border-color: transparent;
            transform: scale(1.05);
        }

        /* 5. AIGC Workflow */
        .workflow {
            background-color: var(--card-bg);
        }

        .workflow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            position: relative;
        }

        .workflow-step {
            text-align: center;
            position: relative;
            background: var(--light-bg);
            padding: 2rem 1.5rem;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .workflow-step:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(99, 102, 241, 0.05);
        }

        .step-number {
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            background: var(--gradient-vibrant);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin: 0 auto 1.2rem auto;
            box-shadow: 0 4px 10px rgba(99,102,241,0.2);
        }

        .workflow-step h3 {
            font-size: 1.15rem;
            margin-bottom: 0.75rem;
        }

        .workflow-step p {
            font-size: 0.85rem;
            color: var(--text-main);
            margin-bottom: 0;
        }

        /* 6. Solutions */
        .solutions {
            background-color: var(--light-bg);
        }

        .solutions-tabs-nav {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-bottom: 3rem;
            flex-wrap: wrap;
        }

        .tab-btn {
            background: white;
            border: 1px solid var(--border-color);
            padding: 0.6rem 1.5rem;
            border-radius: 9999px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            color: var(--text-main);
        }

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

        .solutions-tab-content {
            display: none;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 3rem;
            align-items: center;
            background: white;
            padding: 3rem;
            border-radius: 20px;
            border: 1px solid var(--border-color);
        }

        .solutions-tab-content.active {
            display: grid;
        }

        .sol-details h3 {
            font-size: 1.75rem;
            margin-bottom: 1rem;
        }

        .sol-details ul {
            list-style: none;
            margin: 1.5rem 0;
        }

        .sol-details li {
            margin-bottom: 0.75rem;
            display: flex;
            align-items: flex-start;
            gap: 0.5rem;
        }

        .sol-details li::before {
            content: '✓';
            color: #10b981;
            font-weight: bold;
        }

        .sol-preview {
            background: var(--light-bg);
            border-radius: 12px;
            padding: 1.5rem;
            border: 1px dashed var(--border-color);
        }

        /* 7. Service Network & 8. Technical Standards (Combined Row / Separate Layouts) */
        .network-standards {
            background-color: var(--card-bg);
        }

        .network-standards-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }

        .network-box, .standards-box {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2.5rem;
        }

        .network-list, .standards-list {
            display: flex;
            flex-direction: column;
            gap: 1.25rem;
            margin-top: 1.5rem;
        }

        .timeline-item {
            display: flex;
            gap: 1rem;
        }

        .timeline-marker {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent);
            margin-top: 0.4rem;
            position: relative;
            flex-shrink: 0;
        }

        .timeline-marker::after {
            content: '';
            position: absolute;
            top: 12px;
            left: 5px;
            width: 2px;
            height: 50px;
            background: var(--border-color);
        }

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

        .timeline-content h4 {
            font-size: 1rem;
            margin-bottom: 0.25rem;
        }

        .timeline-content p {
            font-size: 0.85rem;
            margin-bottom: 0;
        }

        .standard-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 1rem 1.25rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .standard-card span {
            font-weight: 600;
            color: var(--text-heading);
        }

        .standard-card .tag-std {
            background: rgba(16, 185, 129, 0.1);
            color: #10b981;
            font-size: 0.75rem;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: bold;
        }

        /* 9. Case Studies (Image Assets allowed here) */
        .cases {
            background-color: var(--light-bg);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .case-card {
            background-color: var(--card-bg);
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.06);
        }

        .case-img-container {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background-color: #eaeaea;
        }

        .case-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        .case-info {
            padding: 1.5rem;
        }

        .case-tag {
            display: inline-block;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary);
            font-size: 0.75rem;
            padding: 0.25rem 0.6rem;
            border-radius: 4px;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }

        .case-info h3 {
            font-size: 1.15rem;
            margin-bottom: 0.5rem;
        }

        .case-info p {
            font-size: 0.85rem;
            color: var(--text-main);
            margin-bottom: 0;
        }

        /* 10. Comparison & Rating */
        .comparison {
            background-color: var(--card-bg);
        }

        .rating-summary-card {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(236, 72, 153, 0.03));
            border: 2px solid var(--primary);
            border-radius: 16px;
            padding: 2rem;
            display: flex;
            align-items: center;
            justify-content: space-around;
            margin-bottom: 3rem;
            flex-wrap: wrap;
            gap: 2rem;
        }

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

        .rating-number {
            font-size: 3.5rem;
            font-weight: 900;
            background: var(--gradient-vibrant);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
        }

        .rating-label {
            font-size: 1rem;
            font-weight: 700;
            margin-top: 0.5rem;
            color: var(--text-heading);
        }

        .stars {
            color: #fbbf24;
            font-size: 1.5rem;
            margin-top: 0.25rem;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border: 1px solid var(--border-color);
            border-radius: 12px;
        }

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

        .comparison-table th, .comparison-table td {
            padding: 1.2rem;
            border-bottom: 1px solid var(--border-color);
        }

        .comparison-table th {
            background-color: var(--light-bg);
            color: var(--text-heading);
            font-weight: 700;
        }

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

        .comparison-table td.highlight-col {
            background-color: rgba(99, 102, 241, 0.03);
            font-weight: 600;
            color: var(--primary);
        }

        .comparison-table tr:hover td {
            background-color: rgba(0,0,0,0.01);
        }

        /* 11. Smart Matching */
        .matching {
            background-color: var(--light-bg);
        }

        .matching-box {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 3rem;
            max-width: 800px;
            margin: 0 auto;
            box-shadow: 0 10px 35px rgba(0,0,0,0.02);
        }

        .matching-step-item {
            margin-bottom: 2rem;
        }

        .matching-step-item label {
            display: block;
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: var(--text-heading);
        }

        .matching-options {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
        }

        .matching-option {
            border: 2px solid var(--border-color);
            border-radius: 10px;
            padding: 1rem;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            background: var(--light-bg);
        }

        .matching-option:hover, .matching-option.selected {
            border-color: var(--primary);
            background: rgba(99, 102, 241, 0.05);
            color: var(--primary);
        }

        .matching-result {
            display: none;
            background: linear-gradient(135deg, rgba(6, 182, 212, 0.05), rgba(99, 102, 241, 0.05));
            border: 1px solid var(--accent);
            border-radius: 12px;
            padding: 1.5rem;
            margin-top: 2rem;
            text-align: center;
        }

        .matching-result h4 {
            color: var(--accent);
            margin-bottom: 0.5rem;
        }

        /* 12. Token Price Comparison */
        .token-price {
            background-color: var(--card-bg);
        }

        .price-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .price-card {
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2.5rem 2rem;
            text-align: center;
            position: relative;
            background: white;
            transition: var(--transition);
        }

        .price-card.popular {
            border-color: var(--secondary);
            transform: scale(1.03);
            box-shadow: 0 15px 30px rgba(236,72,153,0.1);
        }

        .price-card.popular::before {
            content: '性价比首选';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--secondary);
            color: white;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.25rem 1rem;
            border-radius: 9999px;
        }

        .price-header h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

        .price-val {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--text-heading);
            margin-bottom: 0.5rem;
        }

        .price-val span {
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-main);
        }

        .price-features {
            list-style: none;
            margin: 2rem 0;
            text-align: left;
        }

        .price-features li {
            margin-bottom: 0.75rem;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .price-features li::before {
            content: '✔';
            color: var(--primary);
        }

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

        .training-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .training-img-wrapper {
            position: relative;
        }

        .training-img-wrapper img {
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .training-badge-overlay {
            position: absolute;
            bottom: -20px;
            right: -20px;
            background: var(--gradient-vibrant);
            color: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            max-width: 250px;
        }

        .training-badge-overlay h4 {
            color: white;
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }

        .training-badge-overlay p {
            font-size: 0.8rem;
            margin-bottom: 0;
            opacity: 0.9;
        }

        .training-courses {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .course-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            display: flex;
            align-items: center;
            gap: 1.5rem;
            transition: var(--transition);
        }

        .course-card:hover {
            border-color: var(--accent);
            transform: translateX(5px);
        }

        .course-icon {
            font-size: 2rem;
            color: var(--accent);
        }

        .course-details h4 {
            font-size: 1.1rem;
            margin-bottom: 0.25rem;
        }

        .course-details p {
            font-size: 0.85rem;
            margin-bottom: 0;
        }

        /* 15. Help & Troubleshooting & Glossary */
        .help-center {
            background-color: var(--card-bg);
        }

        .help-tabs {
            display: grid;
            grid-template-columns: 250px 1fr;
            gap: 2.5rem;
            min-height: 400px;
        }

        .help-tab-list {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .help-tab-btn {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 1rem 1.5rem;
            border-radius: 8px;
            text-align: left;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-main);
            transition: var(--transition);
        }

        .help-tab-btn.active, .help-tab-btn:hover {
            background: white;
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.05);
        }

        .help-tab-content {
            display: none;
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 2.5rem;
            border-radius: 12px;
        }

        .help-tab-content.active {
            display: block;
        }

        .glossary-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }

        .glossary-item dt {
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 0.25rem;
        }

        .glossary-item dd {
            font-size: 0.85rem;
            color: var(--text-main);
        }

        /* 16. FAQs Collapse Panel */
        .faq-section {
            background-color: var(--light-bg);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-header {
            padding: 1.25rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 700;
            color: var(--text-heading);
            user-select: none;
        }

        .faq-icon-arrow {
            transition: var(--transition);
            color: var(--primary);
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: rgba(248, 250, 252, 0.5);
        }

        .faq-body-content {
            padding: 1.5rem;
            border-top: 1px solid var(--border-color);
            font-size: 0.95rem;
            color: var(--text-main);
            line-height: 1.7;
        }

        .faq-item.open .faq-icon-arrow {
            transform: rotate(180deg);
        }

        /* 17. User Reviews */
        .reviews {
            background-color: var(--card-bg);
        }

        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .review-card {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2rem;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-card:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.03);
        }

        .review-text {
            font-size: 0.95rem;
            font-style: italic;
            margin-bottom: 1.5rem;
            color: var(--text-heading);
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            border-top: 1px solid var(--border-color);
            padding-top: 1rem;
        }

        .author-avatar {
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            background: var(--gradient-vibrant);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 0.9rem;
        }

        .author-info h4 {
            font-size: 0.9rem;
            margin-bottom: 0.1rem;
        }

        .author-info p {
            font-size: 0.75rem;
            color: var(--text-main);
            margin-bottom: 0;
        }

        /* 18. Knowledge Base / Articles */
        .knowledge-base {
            background-color: var(--light-bg);
        }

        .articles-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .article-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

        .article-content {
            padding: 1.5rem;
        }

        .article-meta {
            font-size: 0.75rem;
            color: var(--text-main);
            margin-bottom: 0.5rem;
        }

        .article-content h3 {
            font-size: 1.1rem;
            margin-bottom: 0.75rem;
            line-height: 1.4;
        }

        .article-content p {
            font-size: 0.85rem;
            color: var(--text-main);
            margin-bottom: 1.5rem;
        }

        .article-link {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            font-weight: 600;
            font-size: 0.85rem;
        }

        /* 19. Contact Us & Form */
        .contact {
            background-color: var(--card-bg);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 4rem;
        }

        .contact-info-panel {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        .contact-card {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            display: flex;
            gap: 1rem;
            align-items: flex-start;
        }

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

        .contact-details h4 {
            font-size: 1rem;
            margin-bottom: 0.25rem;
        }

        .contact-details p {
            font-size: 0.9rem;
            margin-bottom: 0;
        }

        .qr-blocks {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .qr-card {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1rem;
            text-align: center;
        }

        .qr-card img {
            margin: 0 auto 0.5rem auto;
            max-width: 120px;
            aspect-ratio: 1;
            border: 1px solid var(--border-color);
        }

        .qr-card p {
            font-size: 0.8rem;
            margin-bottom: 0;
            font-weight: 600;
        }

        .form-panel {
            background: white;
            border: 1px solid var(--border-color);
            padding: 3rem;
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.03);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.25rem;
        }

        .form-group {
            margin-bottom: 1.25rem;
        }

        .form-group.full-width {
            grid-column: span 2;
        }

        .form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
            color: var(--text-heading);
        }

        .form-control {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1.5px solid var(--border-color);
            border-radius: 8px;
            background: var(--light-bg);
            transition: var(--transition);
            font-family: inherit;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            background: white;
            box-shadow: 0 0 0 3px var(--primary-glow);
        }

        /* Footer & Friend Links */
        footer {
            background-color: var(--dark);
            color: #94a3b8; /* Slate 400 */
            padding: 4rem 0 2rem 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-col h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1rem;
        }

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

        .footer-col li {
            margin-bottom: 0.75rem;
        }

        .footer-col a {
            color: #94a3b8;
        }

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

        .friend-links {
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #1e293b;
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
        }

        .friend-links span {
            color: white;
            font-weight: 600;
            font-size: 0.85rem;
        }

        .friend-links a {
            font-size: 0.85rem;
            color: #94a3b8;
            margin-right: 0.5rem;
        }

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

        .footer-bottom {
            padding-top: 2rem;
            border-top: 1px solid #1e293b;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        /* Widgets & Interactive Utilities */
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 3rem;
            height: 3rem;
            border-radius: 50%;
            background: var(--gradient-vibrant);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            cursor: pointer;
            z-index: 99;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .floating-kefu {
            position: fixed;
            right: 2rem;
            bottom: 5.5rem;
            z-index: 99;
        }

        .kefu-trigger {
            width: 3rem;
            height: 3rem;
            border-radius: 50%;
            background: white;
            color: var(--primary);
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            border: 2px solid var(--primary);
            transition: var(--transition);
        }

        .kefu-trigger:hover {
            transform: scale(1.05);
            background: var(--primary);
            color: white;
        }

        .kefu-card-pop {
            position: absolute;
            bottom: 3.5rem;
            right: 0;
            width: 260px;
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            padding: 1.5rem;
            text-align: center;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
        }

        .floating-kefu:hover .kefu-card-pop {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .kefu-card-pop img {
            width: 150px;
            height: 150px;
            margin: 0 auto 0.5rem auto;
            border: 1px solid var(--border-color);
        }

        .kefu-card-pop h4 {
            font-size: 0.95rem;
            margin-bottom: 0.25rem;
        }

        .kefu-card-pop p {
            font-size: 0.8rem;
            color: var(--text-main);
            margin-bottom: 0;
        }

        /* Responsive Styles */
        @media (max-width: 1024px) {
            .hero-features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .solutions-tab-content, .comparison-grid, .training-grid, .contact-grid {
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }
            .network-standards-grid {
                grid-template-columns: 1fr;
            }
            .help-tabs {
                grid-template-columns: 1fr;
            }
            .help-tab-list {
                flex-direction: row;
                overflow-x: auto;
                padding-bottom: 0.5rem;
            }
            .help-tab-btn {
                white-space: nowrap;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: 4.5rem;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 2rem;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
                transform: translateY(-150%);
                transition: var(--transition);
                z-index: 999;
            }
            .nav-menu.open {
                transform: translateY(0);
            }
            .nav-cta {
                display: none;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .service-grid, .workflow-steps, .cases-grid, .price-cards, .reviews-grid, .articles-list {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            .matching-options {
                grid-template-columns: 1fr;
            }
        }