:root {
            --primary: #7C3AED;
            --secondary: #06B6D4;
            --accent-yellow: #FBBF24;
            --accent-pink: #EC4899;
            --bg-color: #FCFCF9;
            --card-bg: #FFFFFF;
            --text-dark: #1C1C1C;
            --text-muted: #555555;
            --border-width: 3px;
            --border-color: #1C1C1C;
            --shadow-offset: 6px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Graffiti Style Utilities */
        .graffiti-box {
            background: var(--card-bg);
            border: var(--border-width) solid var(--border-color);
            box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--border-color);
            border-radius: 12px;
            transition: all 0.2s ease;
        }

        .graffiti-box:hover {
            transform: translate(-2px, -2px);
            box-shadow: calc(var(--shadow-offset) + 2px) calc(var(--shadow-offset) + 2px) 0px var(--border-color);
        }

        .graffiti-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-weight: 800;
            text-decoration: none;
            color: var(--text-dark);
            background: var(--accent-yellow);
            border: var(--border-width) solid var(--border-color);
            box-shadow: 4px 4px 0px var(--border-color);
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.15s ease;
        }

        .graffiti-btn:hover {
            transform: translate(-2px, -2px);
            box-shadow: 6px 6px 0px var(--border-color);
        }

        .graffiti-btn:active {
            transform: translate(2px, 2px);
            box-shadow: 2px 2px 0px var(--border-color);
        }

        .graffiti-btn.btn-cyan {
            background: var(--secondary);
        }

        .graffiti-btn.btn-pink {
            background: var(--accent-pink);
            color: #fff;
        }

        .graffiti-btn.btn-purple {
            background: var(--primary);
            color: #fff;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 80px 0;
            position: relative;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            font-size: 2.5rem;
            font-weight: 900;
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 12px;
            background: var(--secondary);
            z-index: -1;
            transform: rotate(-1.5deg);
        }

        /* Header */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(252, 252, 249, 0.95);
            border-bottom: var(--border-width) solid var(--border-color);
            padding: 15px 0;
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .ai-page-logo {
            height: 45px;
            width: auto;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 900;
            color: var(--text-dark);
        }

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

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links a, .ai-page-home-link {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 700;
            font-size: 0.95rem;
            transition: color 0.2s;
            padding: 5px 10px;
            border-radius: 4px;
        }

        .nav-links a:hover, .ai-page-home-link:hover {
            background: var(--accent-yellow);
            color: var(--text-dark);
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
        }

        /* Hero Section (No images) */
        .hero {
            background: radial-gradient(circle at 10% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 40%), 
                        radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
            text-align: center;
            padding: 120px 0 100px 0;
            border-bottom: var(--border-width) solid var(--border-color);
        }

        .hero-badge {
            display: inline-block;
            background: var(--accent-pink);
            color: #fff;
            padding: 6px 16px;
            font-weight: 800;
            font-size: 0.9rem;
            border: 2px solid var(--border-color);
            border-radius: 20px;
            margin-bottom: 24px;
            box-shadow: 2px 2px 0px var(--border-color);
            transform: rotate(-1deg);
        }

        .ai-hero-title {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 24px;
            letter-spacing: -1px;
        }

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

        .hero-desc {
            font-size: 1.25rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 40px auto;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 60px;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 900px;
            margin: 0 auto;
        }

        .stat-card {
            padding: 20px;
            text-align: center;
        }

        .stat-num {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 700;
        }

        /* Platform Intro & About Us */
        .about-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 2rem;
            margin-bottom: 20px;
            font-weight: 900;
        }

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

        .features-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-top: 30px;
        }

        .features-list li {
            position: relative;
            padding-left: 30px;
            font-weight: 700;
        }

        .features-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: -2px;
            width: 20px;
            height: 20px;
            background: var(--accent-yellow);
            border: 2px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            font-weight: 900;
        }

        .qr-card {
            text-align: center;
            padding: 30px;
            background: var(--accent-yellow);
        }

        .qr-card img {
            max-width: 180px;
            border: var(--border-width) solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 15px;
        }

        /* Services Grid (Model Aggregation) */
        .services-intro {
            text-align: center;
            max-width: 700px;
            margin: -20px auto 40px auto;
            color: var(--text-muted);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }

        .service-card {
            padding: 30px;
            position: relative;
        }

        .service-icon {
            width: 60px;
            height: 60px;
            border: 2px solid var(--border-color);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 20px;
            background: var(--secondary);
            box-shadow: 3px 3px 0 var(--border-color);
        }

        .service-card h4 {
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 12px;
        }

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

        /* Model Tag Cloud */
        .tag-cloud-wrapper {
            margin-top: 50px;
            text-align: center;
        }

        .tag-cloud-title {
            font-size: 1.2rem;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .tag-cloud span {
            padding: 6px 14px;
            border: 2px solid var(--border-color);
            border-radius: 20px;
            background: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            box-shadow: 2px 2px 0 var(--border-color);
            transition: all 0.15s;
        }

        .tag-cloud span:hover {
            transform: translateY(-2px);
            background: var(--accent-pink);
            color: #fff;
        }

        /* One-stop creation workflow */
        .workflow-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 25px;
        }

        .workflow-card {
            padding: 25px;
            background: #fff;
        }

        .workflow-card h4 {
            font-size: 1.25rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--primary);
        }

        /* Industry Solutions */
        .solution-tabs {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .sol-tab-btn {
            padding: 10px 24px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            background: #fff;
            font-weight: 800;
            cursor: pointer;
            box-shadow: 3px 3px 0 var(--border-color);
            transition: all 0.15s;
        }

        .sol-tab-btn.active, .sol-tab-btn:hover {
            background: var(--accent-pink);
            color: #fff;
            transform: translate(-2px, -2px);
            box-shadow: 5px 5px 0 var(--border-color);
        }

        .sol-content {
            display: none;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .sol-content.active {
            display: grid;
        }

        .sol-text h3 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            font-weight: 800;
        }

        .sol-text p {
            color: var(--text-muted);
            margin-bottom: 15px;
        }

        .sol-image-placeholder {
            height: 250px;
            background: repeating-linear-gradient(45deg, #f0f0f0, #f0f0f0 10px, #e8e8e8 10px, #e8e8e8 20px);
            border: var(--border-width) solid var(--border-color);
            border-radius: 12px;
            box-shadow: 5px 5px 0 var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            color: var(--text-muted);
        }

        /* Service Network */
        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
            align-items: center;
        }

        .network-map {
            position: relative;
            height: 350px;
            background: #fdfdfd;
            border: var(--border-width) solid var(--border-color);
            border-radius: 12px;
            box-shadow: 6px 6px 0 var(--border-color);
            overflow: hidden;
        }

        .map-marker {
            position: absolute;
            background: var(--accent-pink);
            border: 2px solid var(--border-color);
            border-radius: 50%;
            width: 14px;
            height: 14px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(236, 72, 153, 0.7); }
            70% { transform: scale(1.3); box-shadow: 0 0 0 10px rgba(236, 72, 153, 0); }
            100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(236, 72, 153, 0); }
        }

        .network-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .network-item {
            padding: 15px;
            background: #fff;
            border: 2px solid var(--border-color);
            border-radius: 8px;
        }

        /* Standardized steps / timeline */
        .timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
            margin-top: 40px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            top: 45px;
            left: 10%;
            width: 80%;
            height: 4px;
            background: var(--border-color);
            z-index: 1;
        }

        .timeline-step {
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .step-num {
            width: 60px;
            height: 60px;
            background: var(--accent-yellow);
            border: var(--border-width) solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 900;
            margin: 0 auto 20px auto;
            box-shadow: 3px 3px 0 var(--border-color);
        }

        .timeline-step:nth-child(even) .step-num {
            background: var(--secondary);
        }

        .timeline-step h4 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            font-weight: 800;
        }

        .timeline-step p {
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 0 10px;
        }

        /* Technical standards */
        .tech-standards-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .std-card {
            padding: 25px;
        }

        .std-card h4 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            font-weight: 800;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 10px;
            color: var(--primary);
        }

        .std-list {
            list-style: none;
        }

        .std-list li {
            padding: 10px 0;
            border-bottom: 1px dashed #ddd;
            display: flex;
            justify-content: space-between;
        }

        .std-list li span:first-child {
            font-weight: 700;
        }

        .std-list li span:last-child {
            color: var(--text-muted);
        }

        /* Cases Center (Grid + Carousel visual style) */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            overflow: hidden;
            background: #fff;
        }

        .case-img-container {
            width: 100%;
            height: 200px;
            overflow: hidden;
            border-bottom: var(--border-width) solid var(--border-color);
            background: #f0f0f0;
        }

        .case-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .case-card:hover .case-img-container img {
            transform: scale(1.05);
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            font-weight: 800;
        }

        .case-tag {
            display: inline-block;
            padding: 3px 8px;
            font-size: 0.75rem;
            background: var(--secondary);
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        /* Compare Evaluation */
        .compare-section {
            background: linear-gradient(180deg, #fff 0%, var(--bg-color) 100%);
        }

        .rating-box {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            background: #fff;
            padding: 20px;
            border: var(--border-width) solid var(--border-color);
            box-shadow: 4px 4px 0 var(--border-color);
            border-radius: 12px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .rating-num {
            font-size: 3.5rem;
            font-weight: 900;
            color: var(--accent-pink);
        }

        .rating-stars {
            font-size: 1.5rem;
            color: var(--accent-yellow);
        }

        .compare-wrapper {
            overflow-x: auto;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            border: var(--border-width) solid var(--border-color);
            background: #fff;
            min-width: 800px;
        }

        .compare-table th, .compare-table td {
            padding: 15px 20px;
            border: var(--border-width) solid var(--border-color);
            text-align: center;
            font-weight: 700;
        }

        .compare-table th {
            background: var(--primary);
            color: #fff;
        }

        .compare-table th:first-child {
            background: #fff;
            color: var(--text-dark);
        }

        .compare-table td.highlight {
            background: rgba(6, 182, 212, 0.08);
            color: var(--primary);
        }

        /* Interactive Matcher */
        .matcher-box {
            max-width: 700px;
            margin: 0 auto;
            padding: 40px;
            background: #fff;
        }

        .matcher-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group label {
            font-weight: 800;
            font-size: 1.05rem;
        }

        .radio-group {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
        }

        .radio-btn {
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 12px;
            text-align: center;
            cursor: pointer;
            font-weight: 700;
            transition: all 0.15s;
        }

        .radio-btn:hover {
            background: #f0f0f0;
        }

        .radio-group input[type="radio"] {
            display: none;
        }

        .radio-group input[type="radio"]:checked + .radio-btn {
            background: var(--accent-pink);
            color: #fff;
            box-shadow: 2px 2px 0 var(--border-color);
        }

        .matcher-result {
            margin-top: 30px;
            padding: 20px;
            background: var(--secondary);
            border: var(--border-width) solid var(--border-color);
            border-radius: 8px;
            display: none;
        }

        /* Token Price Reference */
        .token-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .token-card {
            padding: 30px;
            text-align: center;
        }

        .token-price {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--primary);
            margin: 15px 0;
        }

        .token-features {
            list-style: none;
            margin-bottom: 25px;
            color: var(--text-muted);
            text-align: left;
        }

        .token-features li {
            padding: 8px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        /* Training and Certifications */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 30px;
        }

        .training-card {
            padding: 30px;
            background: #fff;
        }

        .training-card h4 {
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--accent-pink);
        }

        .training-badge {
            display: inline-block;
            background: var(--accent-yellow);
            color: var(--text-dark);
            padding: 4px 10px;
            font-size: 0.8rem;
            font-weight: 800;
            border: 1.5px solid var(--border-color);
            border-radius: 4px;
            margin-bottom: 15px;
        }

        /* Help Center & Quick Guides */
        .help-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .help-nav {
            list-style: none;
        }

        .help-nav li {
            padding: 15px 20px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            font-weight: 700;
            background: #fff;
            cursor: pointer;
            transition: all 0.15s;
        }

        .help-nav li:hover {
            background: var(--accent-yellow);
            transform: translateX(5px);
        }

        /* FAQ Accordion */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border: var(--border-width) solid var(--border-color);
            margin-bottom: 15px;
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 3px 3px 0 var(--border-color);
        }

        .faq-header {
            padding: 20px;
            font-weight: 800;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #fff;
            user-select: none;
        }

        .faq-header::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 700;
        }

        .faq-item.active .faq-header::after {
            content: '-';
        }

        .faq-body {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.25s ease-out, padding 0.25s ease-out;
            color: var(--text-muted);
            border-top: 0px solid var(--border-color);
        }

        .faq-item.active .faq-body {
            padding: 20px;
            max-height: 300px;
            border-top: var(--border-width) solid var(--border-color);
        }

        /* Troubleshooting Tree */
        .trouble-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            justify-content: center;
        }

        .trouble-tab {
            padding: 8px 16px;
            border: 2px solid var(--border-color);
            background: #fff;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
        }

        .trouble-tab.active {
            background: var(--primary);
            color: #fff;
        }

        .trouble-pane {
            display: none;
            padding: 25px;
            background: #fff;
            border: var(--border-width) solid var(--border-color);
            border-radius: 8px;
            box-shadow: 4px 4px 0 var(--border-color);
        }

        .trouble-pane.active {
            display: block;
        }

        .trouble-pane h5 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            font-weight: 800;
        }

        /* Terms Encyclopedia */
        .encyclopedia-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 20px;
        }

        .term-card {
            padding: 20px;
            background: #fff;
            border: 2px solid var(--border-color);
            border-radius: 8px;
        }

        .term-card h5 {
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .term-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Articles & Knowledge Base */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .article-card {
            background: #fff;
            padding: 20px;
        }

        .article-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .article-card h4 {
            font-size: 1.15rem;
            font-weight: 800;
            margin-bottom: 15px;
        }

        .article-card h4 a {
            text-decoration: none;
            color: var(--text-dark);
        }

        .article-card h4 a:hover {
            color: var(--primary);
        }

        /* Reviews / Testimonials */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            padding: 25px;
            background: #fff;
            position: relative;
        }

        .review-card::before {
            content: '“';
            position: absolute;
            top: 10px;
            right: 20px;
            font-size: 4rem;
            color: rgba(0,0,0,0.05);
            font-family: Georgia, serif;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .avatar-placeholder {
            width: 48px;
            height: 48px;
            background: var(--accent-pink);
            border: 2px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            color: #fff;
        }

        .review-card:nth-child(even) .avatar-placeholder {
            background: var(--secondary);
        }

        .user-meta h5 {
            font-weight: 800;
            font-size: 1rem;
        }

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

        /* Affiliate Section */
        .affiliate-box {
            background: var(--accent-pink);
            color: #fff;
            padding: 50px;
            border: var(--border-width) solid var(--border-color);
            border-radius: 12px;
            box-shadow: 6px 6px 0 var(--border-color);
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .affiliate-text h3 {
            font-size: 2.2rem;
            font-weight: 900;
            margin-bottom: 15px;
        }

        .affiliate-text p {
            margin-bottom: 25px;
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .affiliate-action {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            background: #fff;
            padding: 30px;
            border: var(--border-width) solid var(--border-color);
            border-radius: 8px;
            color: var(--text-dark);
            text-align: center;
        }

        /* Contact & Form */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .contact-form-box {
            padding: 40px;
            background: #fff;
        }

        .contact-form-box h3 {
            font-weight: 900;
            font-size: 1.8rem;
            margin-bottom: 20px;
        }

        .contact-info-box {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .contact-item {
            padding: 20px;
            background: #fff;
        }

        .contact-item h5 {
            font-weight: 800;
            margin-bottom: 5px;
        }

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

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .input-field, .select-field, .textarea-field {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.95rem;
            background: #fff;
            outline: none;
            transition: border-color 0.2s;
        }

        .input-field:focus, .select-field:focus, .textarea-field:focus {
            border-color: var(--primary);
        }

        /* Footer */
        footer {
            background: #1C1C1C;
            color: #fff;
            padding: 60px 0 20px 0;
            border-top: var(--border-width) solid var(--border-color);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 0.8fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand h4 {
            font-size: 1.5rem;
            font-weight: 900;
            margin-bottom: 15px;
            color: var(--accent-yellow);
        }

        .footer-links h5, .footer-friendships h5 {
            font-size: 1.1rem;
            margin-bottom: 15px;
            color: var(--secondary);
            font-weight: 800;
        }

        .footer-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        .footer-links a {
            color: #ccc;
            text-decoration: none;
            font-size: 0.9rem;
        }

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

        .friendship-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .friendship-links a {
            color: #aaa;
            text-decoration: none;
            font-size: 0.85rem;
            background: #2D2D2D;
            padding: 5px 10px;
            border-radius: 4px;
        }

        .friendship-links a:hover {
            background: var(--primary);
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #333;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: #888;
        }

        /* Floating customer service */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .widget-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #fff;
            border: 2px solid var(--border-color);
            box-shadow: 2px 2px 0 var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 1.2rem;
            position: relative;
        }

        .widget-btn:hover {
            transform: scale(1.05);
        }

        .widget-btn .qr-tooltip {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: #fff;
            border: var(--border-width) solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 4px 4px 0 var(--border-color);
            display: none;
            text-align: center;
            width: 160px;
        }

        .widget-btn .qr-tooltip img {
            width: 120px;
            height: 120px;
            margin-bottom: 5px;
        }

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

        /* Mobile adaptation */
        @media (max-width: 992px) {
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .network-grid, .tech-standards-grid, .cases-grid, .token-grid, .reviews-grid, .articles-grid, .contact-grid, .affiliate-box {
                grid-template-columns: 1fr;
            }
            .timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            nav {
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #fff;
                border-bottom: var(--border-width) solid var(--border-color);
                flex-direction: column;
                padding: 20px;
                display: none;
            }
            nav.active {
                display: flex;
            }
            .nav-links {
                flex-direction: column;
                width: 100%;
                text-align: center;
            }
            .ai-hero-title {
                font-size: 2.2rem;
            }
            .hero-btns {
                flex-direction: column;
            }
            .radio-group {
                grid-template-columns: 1fr;
            }
        }