/* CSS reset & base variables */
        :root {
            --color-bg: #FDFDF7;
            --color-card-bg: #FFFFFF;
            --color-primary: #FFE81A; /* 涂鸦亮黄 */
            --color-secondary: #74F4CD; /* 涂鸦青绿 */
            --color-accent: #FF8BA7; /* 涂鸦亮粉 */
            --color-dark: #1A1A1A; /* 浓墨黑 */
            --color-text: #2D2D2D;
            --color-muted: #666666;
            --border-style: 3px solid #1A1A1A;
            --shadow-style: 6px 6px 0px #1A1A1A;
            --shadow-style-hover: 10px 10px 0px #1A1A1A;
            --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            background-color: var(--color-bg);
            color: var(--color-text);
            font-family: var(--font-family);
        }

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

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

        section {
            padding: 80px 0;
            border-bottom: var(--border-style);
            position: relative;
        }

        /* Typography & Graffiti Style Header */
        h1, h2, h3, h4 {
            color: var(--color-dark);
            font-weight: 800;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            font-size: 2.5rem;
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
            padding: 10px 20px;
            background: var(--color-secondary);
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            transform-origin: center;
            transform: translateX(-50%) rotate(-1deg);
        }

        .section-title span {
            display: block;
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-muted);
            margin-top: 4px;
            text-transform: uppercase;
        }

        /* Buttons in Brutalist Graffiti Style */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 700;
            text-decoration: none;
            color: var(--color-dark);
            background: var(--color-primary);
            border: var(--border-style);
            box-shadow: 4px 4px 0px var(--color-dark);
            transition: all 0.2s ease;
            cursor: pointer;
            border-radius: 4px;
        }

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

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

        .btn-outline {
            background: transparent;
        }

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

        /* Cards Style */
        .card {
            background: var(--color-card-bg);
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            padding: 24px;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            border-radius: 8px;
        }

        .card:hover {
            transform: translate(-4px, -4px);
            box-shadow: var(--shadow-style-hover);
        }

        /* Navigation Header */
        header {
            position: sticky;
            top: 0;
            background: var(--color-bg);
            border-bottom: var(--border-style);
            z-index: 1000;
            padding: 15px 0;
        }

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

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

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

        .brand-name {
            font-size: 1.5rem;
            font-weight: 900;
            color: var(--color-dark);
            letter-spacing: -1px;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 20px;
        }

        nav a {
            text-decoration: none;
            color: var(--color-dark);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 6px 12px;
            border-radius: 4px;
            transition: all 0.2s ease;
        }

        nav a:hover {
            background: var(--color-primary);
            box-shadow: 2px 2px 0px var(--color-dark);
            border: 1px solid var(--color-dark);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--color-dark);
        }

        /* Hero Section (No Images Allowed) */
        .hero {
            background: radial-gradient(circle at 80% 20%, var(--color-secondary) 0%, transparent 40%),
                        radial-gradient(circle at 10% 80%, var(--color-accent) 0%, transparent 40%);
            background-color: var(--color-bg);
            padding: 100px 0;
            text-align: center;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: var(--color-accent);
            border: 2px solid var(--color-dark);
            font-weight: 700;
            transform: rotate(-2deg);
            margin-bottom: 20px;
        }

        .hero h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 24px;
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 35px;
            color: var(--color-muted);
            font-weight: 500;
        }

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

        /* Data Badges Grid */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 60px;
        }

        .data-card {
            background: #fff;
            text-align: center;
            padding: 20px;
            border: var(--border-style);
            box-shadow: 4px 4px 0px var(--color-dark);
        }

        .data-card .num {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--color-dark);
            display: block;
        }

        .data-card .label {
            font-size: 0.9rem;
            color: var(--color-muted);
            font-weight: 600;
        }

        /* About Section */
        .about-section {
            background: #FAFAF6;
        }

        .about-content {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
        }

        .about-tagline {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-accent);
            margin-bottom: 15px;
        }

        .about-card {
            background: var(--color-primary);
            padding: 30px;
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            transform: rotate(1.5deg);
        }

        /* Services section */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card h3 {
            margin: 15px 0 10px;
            font-size: 1.3rem;
        }

        .service-icon {
            font-size: 2.5rem;
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--color-secondary);
            border: 2px solid var(--color-dark);
            border-radius: 8px;
        }

        /* Models Showcase Marquee */
        .models-showcase {
            background: var(--color-dark);
            color: #fff;
            padding: 40px 0;
            overflow: hidden;
            border-bottom: var(--border-style);
        }

        .models-showcase h3 {
            color: #fff;
            text-align: center;
            margin-bottom: 25px;
            font-size: 1.2rem;
            letter-spacing: 2px;
        }

        .marquee-container {
            display: flex;
            overflow: hidden;
            user-select: none;
            gap: 20px;
        }

        .marquee-content {
            display: flex;
            flex-shrink: 0;
            justify-content: space-around;
            min-width: 100%;
            gap: 20px;
            animation: scroll-marquee 25s linear infinite;
        }

        .marquee-item {
            background: #2D2D2D;
            padding: 8px 20px;
            border: 2px solid #555;
            border-radius: 50px;
            font-weight: 700;
            white-space: nowrap;
        }

        @keyframes scroll-marquee {
            0% { transform: translateX(0); }
            100% { transform: translateX(-100%); }
        }

        /* Automation Flow & Steps */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .flow-step {
            position: relative;
        }

        .step-num {
            position: absolute;
            top: -20px;
            left: 20px;
            font-size: 3rem;
            font-weight: 900;
            color: var(--color-accent);
            opacity: 0.8;
            -webkit-text-stroke: 1.5px var(--color-dark);
        }

        .flow-step h3 {
            margin-top: 20px;
            margin-bottom: 10px;
        }

        /* Contrast / Comparison Table */
        .table-wrapper {
            overflow-x: auto;
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            border-radius: 8px;
            background: #fff;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 800px;
        }

        th, td {
            padding: 16px 20px;
            border-bottom: 2px solid var(--color-dark);
            border-right: 2px solid var(--color-dark);
            font-weight: 600;
        }

        th {
            background: var(--color-primary);
            color: var(--color-dark);
            font-weight: 800;
        }

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

        td:last-child, th:last-child {
            border-right: none;
        }

        .highlight-col {
            background: rgba(116, 244, 205, 0.2);
        }

        .rating-box {
            background: var(--color-accent);
            color: var(--color-dark);
            padding: 4px 8px;
            border: 2px solid var(--color-dark);
            font-weight: 800;
            display: inline-block;
            transform: rotate(-1deg);
        }

        /* Token Price Box */
        .token-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .token-card {
            border: var(--border-style);
            background: #fff;
            padding: 24px;
            border-radius: 8px;
            box-shadow: var(--shadow-style);
        }

        .token-card.best-value {
            background: var(--color-primary);
        }

        .token-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        .token-price {
            font-size: 2rem;
            font-weight: 900;
            margin-bottom: 15px;
        }

        .token-features {
            list-style: none;
            margin-bottom: 20px;
        }

        .token-features li {
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
        }

        /* Training Courses Section */
        .courses-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .course-card {
            background: #fff;
            border: var(--border-style);
            border-radius: 8px;
            padding: 24px;
            box-shadow: var(--shadow-style);
        }

        .course-badge {
            background: var(--color-secondary);
            color: var(--color-dark);
            padding: 4px 10px;
            font-weight: 700;
            border: 2px solid var(--color-dark);
            display: inline-block;
            margin-bottom: 15px;
            font-size: 0.8rem;
        }

        .course-card h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
        }

        /* Solutions Network Map & Gallery */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .solution-pic {
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            border-radius: 8px;
            overflow: hidden;
            height: 300px;
        }

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

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

        .review-card {
            background: #fff;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
        }

        .user-avatar {
            width: 48px;
            height: 48px;
            background: var(--color-primary);
            border: 2px solid var(--color-dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
        }

        .user-info h4 {
            font-size: 1rem;
        }

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

        /* Demand Form Section */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 45px;
        }

        .form-box {
            background: #fff;
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            padding: 40px;
            border-radius: 8px;
        }

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

        .form-group label {
            display: block;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--color-dark);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--color-dark);
            border-radius: 4px;
            font-family: var(--font-family);
            font-size: 1rem;
            background: #FAFAF6;
        }

        .form-control:focus {
            outline: none;
            background: #fff;
            border-color: var(--color-primary);
            box-shadow: 2px 2px 0px var(--color-dark);
        }

        /* QR Info Panel */
        .qr-panel {
            background: var(--color-accent);
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            transform: rotate(-1deg);
        }

        .qr-img {
            max-width: 180px;
            margin: 20px auto;
            border: 3px solid var(--color-dark);
            background: #fff;
            padding: 8px;
        }

        .qr-img img {
            width: 100%;
            display: block;
        }

        .social-info {
            margin-top: 20px;
            text-align: left;
            font-size: 0.95rem;
        }

        .social-info p {
            margin-bottom: 8px;
            font-weight: 700;
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
        }

        .faq-item {
            border: var(--border-style);
            background: #fff;
            margin-bottom: 15px;
            border-radius: 6px;
            box-shadow: 3px 3px 0px var(--color-dark);
            overflow: hidden;
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 20px;
            text-align: left;
            font-size: 1.1rem;
            font-weight: 800;
            color: var(--color-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s ease;
        }

        .faq-question:hover {
            background: rgba(255, 232, 26, 0.1);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: #FAFAF6;
            border-top: 0px solid var(--color-dark);
        }

        .faq-answer p {
            padding: 20px;
            font-size: 0.95rem;
            color: var(--color-text);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            border-top: 2px solid var(--color-dark);
        }

        .faq-item.active .faq-icon::before {
            content: "−";
        }

        .faq-icon::before {
            content: "+";
            font-size: 1.5rem;
            font-weight: 800;
        }

        /* Articles & Knowledge Base */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: #fff;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .article-card h4 {
            font-size: 1.15rem;
            margin-bottom: 12px;
        }

        .article-link {
            font-weight: 800;
            color: var(--color-dark);
            text-decoration: underline;
            margin-top: 15px;
            display: inline-block;
        }

        /* Tag Cloud & Wiki */
        .wiki-section {
            background: #FAFAF6;
        }

        .wiki-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-bottom: 40px;
        }

        .wiki-tag {
            background: #fff;
            border: 2px solid var(--color-dark);
            padding: 8px 16px;
            font-weight: 700;
            font-size: 0.9rem;
            border-radius: 50px;
            box-shadow: 2px 2px 0px var(--color-dark);
        }

        /* Footer & Friends Links */
        footer {
            background: var(--color-dark);
            color: #E0E0E0;
            padding: 60px 0 20px;
            border-top: var(--border-style);
        }

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

        .footer-logo-area {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .footer-title {
            color: #fff;
            font-size: 1.2rem;
            margin-bottom: 20px;
            position: relative;
            display: inline-block;
        }

        .footer-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--color-primary);
        }

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

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #B0B0B0;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--color-primary);
            text-decoration: underline;
        }

        .friend-links {
            border-top: 1px solid #444;
            padding-top: 20px;
            margin-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 0.9rem;
        }

        .friend-links a {
            color: #A0A0A0;
            text-decoration: none;
        }

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

        .footer-bottom {
            text-align: center;
            border-top: 1px solid #333;
            padding-top: 20px;
            margin-top: 20px;
            font-size: 0.85rem;
            color: #888;
        }

        /* Floating customer service */
        .floating-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: var(--color-primary);
            border: var(--border-style);
            box-shadow: 4px 4px 0px var(--color-dark);
            padding: 12px;
            border-radius: 50%;
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .floating-kefu:hover {
            transform: scale(1.1);
            background: var(--color-secondary);
        }

        .kefu-popover {
            position: absolute;
            bottom: 70px;
            right: 0;
            background: #fff;
            border: var(--border-style);
            box-shadow: var(--shadow-style);
            padding: 15px;
            border-radius: 8px;
            width: 180px;
            text-align: center;
            display: none;
        }

        .floating-kefu:hover .kefu-popover {
            display: block;
        }

        .kefu-popover img {
            width: 100%;
            height: auto;
            border: 2px solid var(--color-dark);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .services-grid, .token-grid, .courses-grid, .reviews-grid, .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-grid, .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--color-bg);
                border-bottom: var(--border-style);
                flex-direction: column;
                padding: 20px;
                gap: 15px;
            }

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

            .nav-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .about-content, .contact-wrapper, .solutions-grid {
                grid-template-columns: 1fr;
            }

            .services-grid, .token-grid, .courses-grid, .reviews-grid, .articles-grid, .flow-grid, .data-grid {
                grid-template-columns: 1fr;
            }

            .section-title {
                font-size: 1.8rem;
                width: 90%;
            }
        }