:root {
            --primary: #FFD700;
            --primary-hover: #F5A623;
            --dark: #1E2022;
            --dark-light: #2D3033;
            --light: #F7F9FB;
            --white: #FFFFFF;
            --text-dark: #2c3e50;
            --text-muted: #7f8c8d;
            --border: #E2E8F0;
            --shadow: 0 8px 30px rgba(0,0,0,0.05);
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-dark);
            background-color: var(--light);
        }

        body {
            line-height: 1.6;
        }

        /* Container System */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Typography */
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--dark);
        }

        h2 {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: 15px;
            position: relative;
        }

        h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background: var(--primary);
            margin: 15px auto 0;
            border-radius: 2px;
        }

        .section-desc {
            text-align: center;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 50px;
            font-size: 1.1rem;
        }

        /* Navigation Header */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

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

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

        .brand-name {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--dark);
        }

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

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

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

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

        .nav-btn {
            background: var(--primary);
            color: var(--dark);
            padding: 8px 18px;
            border-radius: 20px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .nav-btn:hover {
            background: var(--dark);
            color: var(--primary);
        }

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

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background: var(--dark);
            border-radius: 2px;
        }

        /* Hero Section (No Images Allowed) */
        .hero {
            background: linear-gradient(135deg, #1E2022 0%, #111215 100%);
            color: var(--white);
            padding: 100px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255, 215, 0, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero-badge {
            background: rgba(255, 215, 0, 0.15);
            border: 1px solid var(--primary);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            display: inline-block;
            margin-bottom: 25px;
            letter-spacing: 1px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .hero h1 {
            color: var(--white);
            font-size: 2.8rem;
            max-width: 800px;
            margin: 0 auto 20px;
            line-height: 1.25;
        }

        .hero p {
            color: #bdc3c7;
            font-size: 1.2rem;
            max-width: 650px;
            margin: 0 auto 35px;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .btn-main {
            background: var(--primary);
            color: var(--dark);
            padding: 14px 32px;
            font-size: 1.1rem;
            font-weight: 700;
            border-radius: 30px;
            text-decoration: none;
            box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
            transition: var(--transition);
        }

        .btn-main:hover {
            background: var(--white);
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        .btn-sub {
            background: transparent;
            border: 2px solid rgba(255,255,255,0.2);
            color: var(--white);
            padding: 14px 32px;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 30px;
            text-decoration: none;
            transition: var(--transition);
        }

        .btn-sub:hover {
            border-color: var(--white);
            background: rgba(255,255,255,0.05);
        }

        /* Generic Section Styling */
        section {
            padding: 80px 0;
        }

        .bg-white {
            background: var(--white);
        }

        /* Data Cards (Section 1 & 2) */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, min-max(220px, 1fr));
            gap: 25px;
            margin-top: -50px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background: var(--white);
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--primary);
            transition: var(--transition);
        }

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

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 5px;
        }

        .stat-label {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* About Us Section */
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
            align-items: center;
        }

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

        .about-text p {
            color: #57606f;
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .about-feat-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
        }

        .about-feat-item::before {
            content: '✓';
            color: var(--primary-hover);
            background: rgba(255, 215, 0, 0.2);
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-size: 0.8rem;
        }

        .about-img-box {
            position: relative;
        }

        .about-img-box img {
            border-radius: 15px;
            box-shadow: var(--shadow);
            width: 100%;
        }

        /* Service Cards Grid (AIGC体系) */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: var(--white);
            border-radius: 15px;
            padding: 35px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            border-color: var(--primary);
        }

        .icon-circle {
            width: 60px;
            height: 60px;
            background: #FFFBE6;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }

        .icon-circle svg {
            width: 30px;
            height: 30px;
            fill: var(--primary-hover);
        }

        .service-card h3 {
            font-size: 1.4rem;
            margin-bottom: 12px;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 15px;
        }

        .service-card ul {
            list-style: none;
            padding-left: 0;
        }

        .service-card li {
            font-size: 0.9rem;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-dark);
        }

        .service-card li::before {
            content: "•";
            color: var(--primary-hover);
            font-weight: bold;
        }

        /* Flow steps (自动化流程) */
        .flow-container {
            position: relative;
            display: flex;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 40px;
        }

        .flow-step {
            flex: 1;
            min-width: 220px;
            background: var(--white);
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            text-align: center;
            position: relative;
        }

        .flow-step:not(:last-child)::after {
            content: '➔';
            position: absolute;
            top: 50%;
            right: -15px;
            transform: translateY(-50%);
            font-size: 1.5rem;
            color: var(--primary);
            z-index: 2;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: var(--dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 15px;
        }

        /* Industry solutions (全行业解决方案) & Service Network */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .solution-card {
            background: #FFFDF0;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid rgba(255, 215, 0, 0.3);
            transition: var(--transition);
        }

        .solution-card:hover {
            background: var(--white);
            box-shadow: var(--shadow);
        }

        /* Table Responsive Styles */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin: 30px 0;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

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

        th {
            background: var(--dark);
            color: var(--white);
            font-weight: 600;
        }

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

        .highlight-row {
            background: rgba(255, 215, 0, 0.05);
        }

        .badge-star {
            background: var(--primary);
            color: var(--dark);
            padding: 3px 8px;
            border-radius: 4px;
            font-weight: bold;
            font-size: 0.85rem;
        }

        /* User Reviews Section */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 25px;
        }

        .review-card {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border-left: 5px solid var(--primary);
        }

        .review-text {
            font-style: italic;
            color: #555;
            margin-bottom: 20px;
            font-size: 0.95rem;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .author-info h4 {
            font-size: 1rem;
            margin-bottom: 2px;
        }

        .author-info span {
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAQ Fold Panel */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            border-radius: 8px;
            margin-bottom: 15px;
            box-shadow: var(--shadow);
            overflow: hidden;
            border: 1px solid var(--border);
        }

        .faq-question {
            padding: 20px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            transition: var(--transition);
        }

        .faq-question:hover {
            background: rgba(255, 215, 0, 0.05);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            content: '−';
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background: #FAFAFA;
        }

        .faq-answer-inner {
            padding: 20px;
            border-top: 1px solid var(--border);
            color: #555;
            font-size: 0.95rem;
        }

        /* Form Styling */
        .form-section {
            background: linear-gradient(135deg, #FFFDF0 0%, #FFFBE6 100%);
        }

        .form-container-box {
            max-width: 700px;
            margin: 0 auto;
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--shadow);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.95rem;
        }

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

        .form-control:focus {
            outline: none;
            border-color: var(--primary-hover);
            box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.25);
        }

        select.form-control {
            appearance: none;
            background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234A5568' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 16px center;
            background-size: 14px;
        }

        .btn-submit {
            background: var(--primary);
            color: var(--dark);
            border: none;
            padding: 15px 30px;
            font-size: 1.1rem;
            font-weight: 700;
            border-radius: 8px;
            width: 100%;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(255,215,0,0.3);
        }

        .btn-submit:hover {
            background: var(--dark);
            color: var(--primary);
        }

        /* Banner Grid and Showcase */
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .showcase-item {
            overflow: hidden;
            border-radius: 12px;
            box-shadow: var(--shadow);
            background: var(--white);
            transition: var(--transition);
        }

        .showcase-item:hover {
            transform: scale(1.03);
        }

        .showcase-item img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }

        .showcase-info {
            padding: 15px;
            font-weight: 600;
            font-size: 0.95rem;
            text-align: center;
        }

        /* Articles & Footer */
        .articles-box {
            background: #FFFDF0;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border);
        }

        .articles-box ul {
            list-style: none;
            padding: 0;
        }

        .articles-box li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--border);
        }

        .articles-box li:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .articles-box a {
            color: var(--dark);
            text-decoration: none;
            font-weight: 500;
            display: block;
            transition: var(--transition);
        }

        .articles-box a:hover {
            color: var(--primary-hover);
            padding-left: 5px;
        }

        /* Float Contact */
        .float-contact {
            position: fixed;
            right: 20px;
            bottom: 20px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-item {
            background: var(--white);
            box-shadow: var(--shadow);
            border-radius: 50%;
            width: 50px;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            border: 2px solid var(--primary);
            position: relative;
            transition: var(--transition);
        }

        .float-item:hover {
            transform: translateY(-3px);
        }

        .float-item svg {
            width: 24px;
            height: 24px;
            fill: var(--dark);
        }

        .qr-popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: var(--white);
            padding: 15px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            display: none;
            width: 150px;
            border: 1px solid var(--border);
            text-align: center;
        }

        .qr-popover img {
            width: 100%;
            height: auto;
            margin-bottom: 5px;
        }

        .qr-popover span {
            font-size: 0.8rem;
            color: var(--text-dark);
            font-weight: 600;
        }

        .float-item:hover .qr-popover {
            display: block;
        }

        footer {
            background: var(--dark);
            color: #bdc3c7;
            padding: 60px 0 30px;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--white);
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

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

        .footer-col a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--primary);
        }

        .friend-links a {
            margin-right: 12px;
            display: inline-block;
            color: #95a5a6;
        }

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

        .footer-bottom {
            border-top: 1px solid var(--dark-light);
            padding-top: 25px;
            text-align: center;
            font-size: 0.85rem;
        }

        /* Responsive */
        @media (max-width: 992px) {
            .about-content {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--white);
                padding: 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .flow-step:not(:last-child)::after {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.2rem;
            }
            section {
                padding: 50px 0;
            }
        }