/* CSS Reset & Variables */
        :root {
            --primary: #00f2fe;
            --primary-dark: #0066ff;
            --accent: #ff007f;
            --text-main: #0f172a;
            --text-muted: #475569;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        * {
            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-main);
            background-color: var(--bg-light);
        }

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

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        .section-padding {
            padding: 80px 0;
        }

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

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary-dark), #7928ca);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 15px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
        }

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

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

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

        .logo-text {
            font-weight: 800;
            font-size: 1.3rem;
            background: linear-gradient(45deg, var(--primary-dark), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

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

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
        }

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

        .nav-btn {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: white;
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 15px rgba(0, 102, 255, 0.2);
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.3);
            color: white;
        }

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

        /* Hero Section (No Image) */
        .hero-section {
            background: radial-gradient(circle at 90% 10%, rgba(0, 242, 254, 0.15) 0%, transparent 60%),
                        radial-gradient(circle at 10% 90%, rgba(121, 40, 202, 0.1) 0%, transparent 60%),
                        var(--bg-white);
            padding: 100px 0 80px 0;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-block;
            background: linear-gradient(90deg, rgba(0, 242, 254, 0.1), rgba(0, 102, 255, 0.1));
            color: var(--primary-dark);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 25px;
            border: 1px solid rgba(0, 102, 255, 0.2);
        }

        .hero-title {
            font-size: 3rem;
            line-height: 1.2;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 25px;
        }

        .hero-title span {
            background: linear-gradient(135deg, var(--primary-dark) 30%, var(--primary) 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.7;
        }

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

        .btn {
            display: inline-block;
            padding: 15px 35px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.05rem;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-dark), #00d2ff);
            color: white;
            box-shadow: 0 10px 25px rgba(0, 102, 255, 0.25);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(0, 102, 255, 0.35);
        }

        .btn-secondary {
            background: var(--bg-white);
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background: var(--bg-light);
            transform: translateY(-3px);
        }

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

        .stat-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 30px 20px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px rgba(0, 102, 255, 0.08);
            border-color: rgba(0, 242, 254, 0.5);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-dark);
            line-height: 1;
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* Platform Introduction & About Us */
        .about-section {
            background-color: var(--bg-white);
        }

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

        .about-content h3 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text-main);
        }

        .about-content p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .about-features {
            list-style: none;
        }

        .about-features li {
            position: relative;
            padding-left: 30px;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .about-features li::before {
            content: "✓";
            position: absolute;
            left: 0;
            top: 0;
            color: #00d2ff;
            font-weight: 900;
            font-size: 1.2rem;
        }

        .about-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 25px;
        }

        .about-tag {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Services的能力卡片 */
        .services-section {
            background-color: var(--bg-light);
        }

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

        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            opacity: 0;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(0, 102, 255, 0.1);
            border-color: rgba(0, 102, 255, 0.1);
        }

        .service-card:hover::before {
            opacity: 1;
        }

        .service-icon {
            width: 60px;
            height: 60px;
            background: rgba(0, 242, 254, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--primary-dark);
            margin-bottom: 25px;
        }

        .service-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

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

        .service-list {
            margin-top: 20px;
            list-style: none;
            padding-top: 15px;
            border-top: 1px dashed var(--border-color);
        }

        .service-list li {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        /* Model Supported Slider/Marquee style tags */
        .model-marquee-section {
            background-color: var(--bg-white);
            padding: 40px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }

        .marquee-title {
            text-align: center;
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-muted);
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .marquee-wrapper {
            display: flex;
            width: max-content;
            animation: marquee 40s linear infinite;
        }

        .marquee-content {
            display: flex;
            gap: 15px;
        }

        .model-tag {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
        }

        @keyframes marquee {
            0% { transform: translateX(0); }
            100% { transform: translateX(-50%); }
        }

        /* Standardization Flow & Steps */
        .flow-section {
            background: var(--bg-light);
        }

        .steps-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px 25px;
            position: relative;
        }

        .step-num {
            position: absolute;
            top: -20px;
            left: 25px;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            box-shadow: 0 4px 10px rgba(0, 102, 255, 0.2);
        }

        .step-card h3 {
            margin-top: 15px;
            font-size: 1.25rem;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .step-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        /* Cases Section with specific images */
        .cases-section {
            background-color: var(--bg-white);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.05);
        }

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

        .case-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

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

        .case-info {
            padding: 30px;
        }

        .case-tag {
            display: inline-block;
            background: rgba(0, 102, 255, 0.08);
            color: var(--primary-dark);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .case-info h3 {
            font-size: 1.4rem;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .case-info p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .case-metrics {
            display: flex;
            gap: 20px;
            border-top: 1px solid var(--border-color);
            padding-top: 15px;
        }

        .case-metric-item span {
            display: block;
        }

        .case-metric-val {
            font-weight: 800;
            color: var(--primary-dark);
            font-size: 1.1rem;
        }

        .case-metric-lbl {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* Side-by-side Layout with Box image */
        .feature-showcase {
            background-color: var(--bg-light);
        }

        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
            align-items: center;
        }

        .showcase-img {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.06);
            border: 1px solid var(--border-color);
        }

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

        .showcase-feat-card {
            background: var(--bg-white);
            padding: 20px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .showcase-feat-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

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

        /* Evaluation Section */
        .evaluation-section {
            background-color: var(--bg-white);
        }

        .eval-hero-card {
            background: linear-gradient(135deg, rgba(0, 242, 254, 0.05), rgba(0, 102, 255, 0.05));
            border: 1px solid rgba(0, 102, 255, 0.1);
            border-radius: 20px;
            padding: 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 30px;
            margin-bottom: 50px;
        }

        .eval-score-box {
            text-align: center;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: 16px;
            min-width: 200px;
            box-shadow: 0 10px 25px rgba(0, 102, 255, 0.05);
        }

        .eval-stars {
            color: #ffb800;
            font-size: 1.5rem;
            margin-bottom: 10px;
        }

        .eval-score-num {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1;
            color: var(--text-main);
        }

        .eval-score-max {
            font-size: 1.1rem;
            color: var(--text-muted);
        }

        .eval-badge {
            background: var(--primary-dark);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            display: inline-block;
            margin-top: 10px;
        }

        .eval-details {
            flex: 1;
            min-width: 300px;
        }

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

        .eval-details p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .eval-table-container {
            overflow-x: auto;
        }

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

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

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

        .eval-table tr:hover {
            background-color: rgba(0, 102, 255, 0.01);
        }

        .eval-highlight {
            color: var(--primary-dark);
            font-weight: 700;
        }

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

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

        .pricing-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px 30px;
            text-align: center;
            position: relative;
        }

        .pricing-card.featured {
            border: 2px solid var(--primary-dark);
            box-shadow: 0 20px 40px rgba(0, 102, 255, 0.08);
        }

        .pricing-ribbon {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--accent);
            color: white;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
        }

        .pricing-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .pricing-price {
            margin: 20px 0;
        }

        .price-num {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--text-main);
        }

        .price-unit {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

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

        .pricing-features li {
            padding: 10px 0;
            border-bottom: 1px solid var(--bg-light);
            font-size: 0.9rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* Training Sections */
        .training-section {
            background-color: var(--bg-white);
        }

        .training-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 20px;
        }

        .training-card {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 25px 20px;
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            transform: translateY(-5px);
            background: var(--bg-white);
            border-color: var(--primary-dark);
            box-shadow: 0 10px 20px rgba(0,102,255,0.05);
        }

        .training-icon {
            font-size: 2.2rem;
            margin-bottom: 15px;
            display: inline-block;
        }

        .training-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .training-card p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Troubleshooting & Glossary */
        .help-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .help-box {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
        }

        .help-box h3 {
            font-size: 1.5rem;
            margin-bottom: 25px;
            font-weight: 700;
            border-bottom: 2px solid var(--primary-dark);
            padding-bottom: 10px;
            display: inline-block;
        }

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

        .help-item {
            margin-bottom: 20px;
        }

        .help-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-main);
        }

        .help-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* FAQ Accordion */
        .faq-section {
            background-color: var(--bg-white);
        }

        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 15px 0;
        }

        .faq-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            background: none;
            border: none;
            text-align: left;
            font-size: 1.05rem;
            font-weight: 700;
            padding: 10px 0;
            cursor: pointer;
            color: var(--text-main);
        }

        .faq-icon {
            font-size: 1.2rem;
            transition: var(--transition);
            color: var(--primary-dark);
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .faq-content {
            padding: 10px 0 20px 0;
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* Testimonials */
        .testimonials-section {
            background-color: var(--bg-light);
        }

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

        .testimonial-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.01);
        }

        .test-content {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-style: italic;
            margin-bottom: 20px;
        }

        .test-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .test-avatar {
            width: 45px;
            height: 45px;
            background: var(--bg-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary-dark);
            border: 1px solid var(--border-color);
        }

        .test-meta h4 {
            font-size: 0.95rem;
            font-weight: 700;
        }

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

        /* Contact & Form Section */
        .contact-section {
            background-color: var(--bg-white);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-details h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 25px;
        }

        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            margin-bottom: 25px;
        }

        .contact-item-icon {
            font-size: 1.3rem;
            color: var(--primary-dark);
            margin-top: 3px;
        }

        .contact-item-text h4 {
            font-size: 1rem;
            font-weight: 700;
        }

        .contact-item-text p {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .kefu-qrcode-box {
            margin-top: 30px;
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            gap: 20px;
        }

        .kefu-qrcode-box img {
            width: 100px;
            height: 100px;
            border-radius: 6px;
        }

        .kefu-text h5 {
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 5px;
        }

        .kefu-text p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Standard POST Form */
        .contact-form-card {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 16px;
        }

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

        .form-group label {
            display: block;
            font-size: 0.9rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            background: var(--bg-white);
            border-radius: 8px;
            font-size: 0.95rem;
            color: var(--text-main);
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-dark);
            box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
        }

        textarea.form-control {
            resize: vertical;
            min-height: 120px;
        }

        .submit-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: white;
            border: none;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px;
            border-radius: 8px;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0, 102, 255, 0.2);
            transition: var(--transition);
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.3);
        }

        /* Banner Showcase Section (Images allowed here) */
        .banners-section {
            background-color: var(--bg-light);
            padding: 60px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .banners-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .banner-card {
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 10px rgba(0,0,0,0.02);
            background: var(--bg-white);
        }

        .banner-card img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
        }

        .banner-card-info {
            padding: 15px;
        }

        .banner-card-info h4 {
            font-size: 0.95rem;
            font-weight: 700;
        }

        /* Knowledge Base / News */
        .news-section {
            background-color: var(--bg-white);
        }

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

        .news-card {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 25px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition);
        }

        .news-card:hover {
            transform: translateY(-5px);
            background: var(--bg-white);
            border-color: var(--primary-dark);
            box-shadow: 0 10px 20px rgba(0,102,255,0.05);
        }

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

        .news-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .news-link {
            color: var(--primary-dark);
            font-weight: 700;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .news-link:hover {
            gap: 8px;
        }

        /* Footer */
        .site-footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
            border-top: 4px solid var(--primary-dark);
        }

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

        .footer-brand h4 {
            color: white;
            font-size: 1.25rem;
            margin-bottom: 15px;
            font-weight: 800;
        }

        .footer-brand p {
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .footer-links-col h5 {
            color: white;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

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

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

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

        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }

        .friend-links-box {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 15px;
            margin-top: 10px;
        }

        .friend-links-box a {
            color: #94a3b8;
            font-size: 0.85rem;
            background: rgba(255,255,255,0.05);
            padding: 4px 10px;
            border-radius: 4px;
        }

        .friend-links-box a:hover {
            background: var(--primary-dark);
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }

        /* Floating Sidebar Widgets */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            cursor: pointer;
            transition: var(--transition);
            color: var(--text-main);
            position: relative;
        }

        .float-btn:hover {
            background: var(--primary-dark);
            color: white;
            transform: translateY(-3px);
        }

        .float-qr-box {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            display: none;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            width: 140px;
        }

        .float-qr-box img {
            width: 110px;
            height: 110px;
        }

        .float-qr-box span {
            font-size: 0.75rem;
            color: var(--text-main);
            font-weight: 700;
        }

        .float-btn-kefu:hover .float-qr-box {
            display: flex;
        }

        /* Responsive Design */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-container {
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }
            .training-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .banners-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            .main-nav {
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--bg-white);
                border-bottom: 1px solid var(--border-color);
                flex-direction: column;
                padding: 20px;
                gap: 15px;
                display: none;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .main-nav.active {
                display: flex;
            }
            .nav-links {
                flex-direction: column;
                align-items: center;
                width: 100%;
            }
            .hero-title {
                font-size: 2.2rem;
            }
            .about-grid, .cases-grid, .showcase-grid, .contact-grid, .help-grid {
                grid-template-columns: 1fr;
            }
            .services-grid, .pricing-grid, .news-grid, .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 480px) {
            .stats-grid, .steps-container, .training-grid, .banners-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .eval-hero-card {
                padding: 20px;
            }
        }