:root {
            --primary: #0066ff;
            --primary-hover: #0052cc;
            --secondary: #00f2fe;
            --accent: #7f00ff;
            --dark: #0f172a;
            --light-bg: #f8fafc;
            --text-main: #334155;
            --text-heading: #0f172a;
            --border-color: #e2e8f0;
            --max-width: 1200px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #ffffff;
            color: var(--text-main);
            line-height: 1.6;
        }

        /* Util Classes */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

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

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

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

        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            margin: 8px auto 0;
            border-radius: 2px;
        }

        .section-title p {
            font-size: 1.1rem;
            color: #64748b;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            border: none;
            box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
        }

        .btn-secondary {
            background: #ffffff;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background: rgba(0, 102, 255, 0.05);
            transform: translateY(-2px);
        }

        /* Header */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            height: 70px;
            display: flex;
            align-items: center;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

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

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

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

        .nav-link {
            text-decoration: none;
            color: var(--text-main);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s;
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            border: none;
            background: none;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--text-heading);
            transition: 0.3s;
        }

        /* Hero (No Image!) */
        .hero {
            padding: 150px 0 100px;
            background: radial-gradient(circle at 80% 20%, rgba(0, 242, 254, 0.1) 0%, rgba(127, 0, 255, 0.05) 50%, #ffffff 100%);
            position: relative;
            overflow: hidden;
            border-bottom: none;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 10%;
            left: 5%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0, 102, 255, 0.1) 0%, transparent 70%);
            filter: blur(50px);
            pointer-events: none;
        }

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

        .hero h1 {
            font-size: 2.8rem;
            line-height: 1.3;
            color: var(--text-heading);
            margin-bottom: 24px;
            font-weight: 800;
        }

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

        .hero p {
            font-size: 1.25rem;
            color: #475569;
            margin-bottom: 40px;
            max-width: 750px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
        }

        /* Stats Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }

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

        .stat-card h3 {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-card p {
            font-size: 0.9rem;
            color: #64748b;
        }

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

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

        .about-content p {
            margin-bottom: 16px;
            color: #475569;
        }

        .feature-bullets {
            list-style: none;
            margin-top: 24px;
        }

        .feature-bullets li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 12px;
            font-weight: 500;
        }

        .feature-bullets li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
            font-size: 1.1rem;
        }

        .about-media-box {
            position: relative;
            background: linear-gradient(135deg, rgba(0, 102, 255, 0.05), rgba(127, 0, 255, 0.05));
            border-radius: 16px;
            padding: 20px;
            border: 1px dashed var(--primary);
        }

        .about-media-box p {
            font-weight: bold;
            color: var(--primary);
            margin-bottom: 15px;
        }

        /* Service Cards */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .service-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: all 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 102, 255, 0.1);
            border-color: var(--primary);
        }

        .service-card .icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 242, 254, 0.1));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 12px;
            color: var(--text-heading);
        }

        .service-card p {
            font-size: 0.95rem;
            color: #64748b;
        }

        /* Workflow Timeline */
        .workflow-timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .workflow-timeline::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 4px;
            background: var(--border-color);
            transform: translateX(-50%);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            width: 50%;
            padding: 0 40px;
        }

        .timeline-item:nth-child(odd) {
            left: 0;
            text-align: right;
        }

        .timeline-item:nth-child(even) {
            left: 50%;
            text-align: left;
        }

        .timeline-badge {
            position: absolute;
            top: 0;
            left: 100%;
            transform: translate(-50%, 0);
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--primary);
            border: 4px solid #ffffff;
            z-index: 10;
        }

        .timeline-item:nth-child(even) .timeline-badge {
            left: 0;
        }

        .timeline-panel {
            background-color: var(--light-bg);
            padding: 24px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .timeline-panel h3 {
            color: var(--text-heading);
            margin-bottom: 8px;
        }

        /* Industry Solutions */
        .solutions-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .solutions-media-container {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .solutions-media-container img {
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            width: 100%;
            object-fit: cover;
        }

        .solutions-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .solution-item {
            background: #ffffff;
            border-left: 4px solid var(--primary);
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
        }

        .solution-item h4 {
            color: var(--text-heading);
            margin-bottom: 5px;
        }

        /* Comparison Section */
        .comparison-table-wrapper {
            overflow-x: auto;
            background: #ffffff;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        }

        .comparison-badge {
            background: linear-gradient(135deg, var(--accent), var(--primary));
            color: #ffffff;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            margin-bottom: 30px;
        }

        .comparison-badge .stars {
            color: #fbbf24;
            font-size: 1.5rem;
            margin-bottom: 5px;
        }

        .comparison-badge .score {
            font-size: 2.5rem;
            font-weight: 800;
        }

        table.comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        table.comparison-table th, table.comparison-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .highlight-col {
            background-color: rgba(0, 102, 255, 0.03);
            font-weight: 600;
            color: var(--primary);
        }

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

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

        .price-card {
            background-color: #ffffff;
            border-radius: 16px;
            padding: 40px 30px;
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .price-card.featured {
            border-color: var(--primary);
            box-shadow: 0 10px 25px rgba(0, 102, 255, 0.1);
        }

        .price-card.featured::before {
            content: '最佳性价比';
            position: absolute;
            top: 15px;
            right: -30px;
            background-color: var(--accent);
            color: #ffffff;
            font-size: 0.75rem;
            padding: 4px 30px;
            transform: rotate(45deg);
        }

        .price-card h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
        }

        .price-card .price {
            font-size: 2.2rem;
            color: var(--text-heading);
            font-weight: 800;
            margin-bottom: 25px;
        }

        .price-card .price span {
            font-size: 1rem;
            color: #64748b;
            font-weight: normal;
        }

        .price-features {
            list-style: none;
            margin-bottom: 30px;
            text-align: left;
        }

        .price-features li {
            margin-bottom: 12px;
            padding-left: 24px;
            position: relative;
        }

        .price-features li::before {
            content: '•';
            color: var(--primary);
            font-weight: bold;
            position: absolute;
            left: 0;
        }

        /* Tag Cloud & Models supported */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 40px;
        }

        .model-tag {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s;
        }

        .model-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* Training Section */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 15px;
        }

        .training-card {
            background-color: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 12px;
            text-align: center;
            transition: all 0.3s;
        }

        .training-card:hover {
            background-color: #ffffff;
            border-color: var(--primary);
            box-shadow: 0 8px 16px rgba(0,102,255,0.06);
            transform: translateY(-3px);
        }

        .training-card h4 {
            font-size: 1rem;
            margin-top: 10px;
            color: var(--text-heading);
        }

        .cert-badge {
            display: inline-block;
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: white;
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: 4px;
            margin-bottom: 8px;
        }

        /* Case Center & Banner Displays */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .case-card {
            background: #ffffff;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .case-card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
        }

        .case-info {
            padding: 24px;
        }

        .case-info h3 {
            margin-bottom: 10px;
            color: var(--text-heading);
        }

        /* FAQ Accordions */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

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

        .faq-question {
            padding: 18px 24px;
            background-color: #ffffff;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--text-heading);
            user-select: none;
            transition: background-color 0.3s;
        }

        .faq-question:hover {
            background-color: var(--light-bg);
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: #475569;
            font-size: 0.95rem;
            border-top: 0 solid var(--border-color);
        }

        .faq-item.active .faq-answer {
            padding: 18px 24px;
            max-height: 500px;
            border-top: 1px solid var(--border-color);
        }

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

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

        /* Troubleshooter & Glossary Grid */
        .tools-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .tool-box {
            background: var(--light-bg);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .tool-box h3 {
            margin-bottom: 20px;
            color: var(--text-heading);
            border-bottom: 2px solid var(--primary);
            padding-bottom: 10px;
        }

        .trouble-steps, .glossary-list {
            list-style: none;
        }

        .trouble-steps li, .glossary-list li {
            margin-bottom: 15px;
        }

        .trouble-steps strong, .glossary-list strong {
            color: var(--text-heading);
            display: block;
            margin-bottom: 4px;
        }

        /* Industry News (Articles) */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .news-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: transform 0.3s;
        }

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

        .news-card h4 {
            color: var(--text-heading);
            margin-bottom: 12px;
            font-size: 1.1rem;
        }

        .news-card p {
            font-size: 0.9rem;
            color: #64748b;
            margin-bottom: 20px;
        }

        .news-link {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .news-link:hover {
            text-decoration: underline;
        }

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

        .review-card {
            background-color: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            position: relative;
        }

        .review-rating {
            color: #fbbf24;
            margin-bottom: 12px;
        }

        .review-content {
            font-style: italic;
            color: var(--text-main);
            margin-bottom: 20px;
        }

        .review-author {
            display: flex;
            flex-direction: column;
        }

        .review-author span:first-child {
            font-weight: bold;
            color: var(--text-heading);
        }

        .review-author span:last-child {
            font-size: 0.85rem;
            color: #64748b;
        }

        /* Contact & Form */
        .contact-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
        }

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

        .contact-card {
            background-color: var(--light-bg);
            padding: 24px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .contact-card img {
            width: 120px;
            height: 120px;
            object-fit: cover;
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        .contact-card-text h4 {
            color: var(--text-heading);
            margin-bottom: 6px;
        }

        .contact-card-text p {
            font-size: 0.95rem;
            color: #64748b;
        }

        .form-panel {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-heading);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
        }

        /* Footer */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px;
        }

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

        .footer-logo-col p {
            margin-top: 15px;
            line-height: 1.8;
        }

        .footer-links-col h4 {
            color: #ffffff;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

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

        .footer-links-col ul li {
            margin-bottom: 12px;
        }

        .footer-links-col ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .friend-links-area {
            border-top: 1px solid #334155;
            padding-top: 20px;
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            align-items: center;
        }

        .friend-links-title {
            color: #ffffff;
            font-size: 0.9rem;
            font-weight: bold;
        }

        .friend-links-area a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.3s;
        }

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

        .copyright-area {
            border-top: 1px solid #334155;
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
        }

        /* Floating CS Widget */
        .floating-cs {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .cs-trigger {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,102,255,0.4);
            cursor: pointer;
            position: relative;
        }

        .cs-trigger:hover .cs-card {
            display: block;
        }

        .cs-card {
            display: none;
            position: absolute;
            bottom: 60px;
            right: 0;
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            width: 260px;
            color: var(--text-main);
            text-align: center;
        }

        .cs-card img {
            width: 150px;
            height: 150px;
            margin-bottom: 10px;
            border-radius: 8px;
        }

        .cs-card p {
            font-size: 0.85rem;
            margin-bottom: 5px;
        }

        /* Back to top */
        .back-to-top {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            color: var(--text-heading);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }

        .back-to-top:hover {
            background-color: var(--primary);
            color: #ffffff;
            transform: translateY(-3px);
        }

        /* Responsive Design */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .service-grid, .pricing-grid, .news-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: #ffffff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
            }
            nav.active {
                display: flex;
            }
            .about-grid, .solutions-grid, .cases-grid, .tools-grid, .contact-layout, .footer-inner {
                grid-template-columns: 1fr;
            }
            .timeline-item {
                width: 100%;
                left: 0 !important;
                text-align: left !important;
                padding-left: 50px;
            }
            .workflow-timeline::before {
                left: 20px;
            }
            .timeline-badge {
                left: 20px !important;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .stats-grid, .service-grid, .pricing-grid, .news-grid, .reviews-grid, .training-grid {
                grid-template-columns: 1fr;
            }
        }