:root {
      --bg-base: #f7f9fd;
      --bg-card: #ffffff;
      --text-main: #131b2e;
      --text-muted: #56617a;
      --neon-cyan: #00d2ff;
      --neon-purple: #7928ca;
      --neon-pink: #ff007a;
      --neon-gradient: linear-gradient(135deg, #00d2ff 0%, #7928ca 50%, #ff007a 100%);
      --border-color: #e2e8f4;
      --shadow-sm: 0 4px 12px rgba(19, 27, 46, 0.05);
      --shadow-md: 0 8px 24px rgba(121, 40, 202, 0.08);
      --shadow-hover: 0 12px 32px rgba(0, 210, 255, 0.16);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }
    * {
      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;
      background-color: var(--bg-base);
      color: var(--text-main);
    }
    body {
      background: radial-gradient(circle at 10% 10%, rgba(0, 210, 255, 0.04) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(255, 0, 122, 0.04) 0%, transparent 40%),
                  var(--bg-base);
      line-height: 1.6;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.25rem;
    }
    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }
    .nav-links a:hover {
      color: #7928ca;
      background: rgba(121, 40, 202, 0.06);
    }
    .nav-cta-btn {
      background: var(--neon-gradient);
      color: #ffffff !important;
      padding: 8px 18px !important;
      border-radius: 30px !important;
      font-weight: 600 !important;
      box-shadow: 0 4px 14px rgba(121, 40, 202, 0.25);
      transition: transform 0.2s ease, box-shadow 0.2s ease !important;
    }
    .nav-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4) !important;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 30px;
      background: #ffffff;
      border: 1px solid rgba(121, 40, 202, 0.2);
      box-shadow: var(--shadow-sm);
      font-size: 0.88rem;
      color: #7928ca;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-cyan);
      box-shadow: 0 0 10px var(--neon-cyan);
      display: inline-block;
    }
    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title .glow-text {
      background: var(--neon-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
    }
    .hero-buttons {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: 30px;
      font-size: 1.05rem;
      font-weight: 600;
      text-decoration: none;
      background: var(--neon-gradient);
      color: #ffffff;
      box-shadow: 0 8px 24px rgba(121, 40, 202, 0.3);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
    }
    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(0, 210, 255, 0.45);
    }
    .btn-sub {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      border-radius: 30px;
      font-size: 1.05rem;
      font-weight: 600;
      text-decoration: none;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .btn-sub:hover {
      border-color: #7928ca;
      color: #7928ca;
      transform: translateY(-2px);
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
      overflow: hidden;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--neon-gradient);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-num span {
      font-size: 1.1rem;
      color: #7928ca;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    section {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #7928ca;
      margin-bottom: 10px;
      display: block;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .intro-text-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .intro-text-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .intro-text-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }
    .feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .feature-list li::before {
      content: "✓";
      color: #00d2ff;
      font-weight: 900;
    }
    .model-tags-box {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .model-tags-box h4 {
      font-size: 1.15rem;
      margin-bottom: 18px;
      color: var(--text-main);
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .model-pill {
      background: #f0f4fc;
      border: 1px solid rgba(121, 40, 202, 0.12);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s ease;
    }
    .model-pill:hover {
      background: var(--neon-gradient);
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 4px 10px rgba(0, 210, 255, 0.25);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(121, 40, 202, 0.4);
      box-shadow: var(--shadow-hover);
    }
    .service-card-top {
      margin-bottom: 16px;
    }
    .service-icon-wrap {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      background: rgba(0, 210, 255, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: #7928ca;
      font-weight: 800;
      font-size: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: #ffffff;
      padding: 26px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--neon-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }
    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .media-img-wrap {
      width: 100%;
      background: #eef2f8;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .media-img-wrap img {
      width: 100%;
      height: auto;
      max-height: 320px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }
    .media-content {
      padding: 20px;
    }
    .media-content h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .media-content p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .eval-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .eval-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 28px;
    }
    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .score-num {
      font-size: 3rem;
      font-weight: 900;
      background: var(--neon-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .score-max {
      font-size: 1.1rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .stars-text {
      color: #ffaa00;
      font-size: 1.3rem;
      font-weight: 700;
    }
    .table-container {
      overflow-x: auto;
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    .eval-table th, .eval-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-color);
    }
    .eval-table th {
      background: #f4f7fc;
      font-weight: 700;
      color: var(--text-main);
    }
    .eval-table tr:hover td {
      background: rgba(0, 210, 255, 0.03);
    }
    .eval-highlight {
      color: #7928ca;
      font-weight: 700;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid #7928ca;
      box-shadow: var(--shadow-md);
    }
    .popular-tag {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--neon-gradient);
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 14px;
      border-radius: 20px;
    }
    .pricing-price {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      margin: 16px 0;
    }
    .pricing-features {
      list-style: none;
      text-align: left;
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .pricing-features li {
      padding: 8px 0;
      border-bottom: 1px dashed var(--border-color);
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-quote {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--neon-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
    }
    .author-info span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 24px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .article-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }
    .article-item a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      display: block;
      margin-bottom: 8px;
    }
    .article-item a:hover {
      color: #7928ca;
    }
    .article-meta {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s ease;
    }
    .faq-question {
      padding: 18px 22px;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question:hover {
      color: #7928ca;
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: #7928ca;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fafcff;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      padding: 0 22px;
    }
    .faq-item.active {
      border-color: rgba(121, 40, 202, 0.4);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 0 22px 18px 22px;
    }
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .contact-info-col h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .contact-info-col p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }
    .contact-meta-list {
      list-style: none;
      margin-bottom: 24px;
    }
    .contact-meta-list li {
      margin-bottom: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .qr-box {
      display: inline-block;
      padding: 12px;
      background: #f4f7fc;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
    }
    .qr-box img {
      width: 120px;
      height: 120px;
      object-fit: cover;
      display: block;
      margin: 0 auto 8px;
    }
    .qr-box span {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .form-col form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      text-align: left;
    }
    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-group input, .form-group select, .form-group textarea {
      width: 100%;
      padding: 12px 14px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      font-size: 0.92rem;
      background: #fbfcfe;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
      border-color: #7928ca;
      background: #ffffff;
    }
    .form-submit-btn {
      margin-top: 10px;
      width: 100%;
    }
    footer.site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      margin-top: auto;
    }
    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .footer-links-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .footer-links-group a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s ease;
    }
    .footer-links-group a:hover {
      color: #7928ca;
    }
    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-muted);
      align-items: center;
    }
    .friend-links-wrap a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .friend-links-wrap a:hover {
      color: #00d2ff;
    }
    .footer-bottom {
      text-align: center;
      font-size: 0.82rem;
      color: #838eab;
    }
    .floating-widget {
      position: fixed;
      right: 24px;
      bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 99;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: #7928ca;
      font-weight: 700;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .float-btn:hover {
      background: var(--neon-gradient);
      color: #ffffff;
      transform: scale(1.08);
    }
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .intro-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow-timeline { grid-template-columns: repeat(2, 1fr); }
      .media-showcase-grid { grid-template-columns: 1fr; }
      .pricing-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .articles-grid { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active { display: flex; }
      .nav-links a { width: 100%; text-align: center; padding: 12px 0; }
      .mobile-menu-toggle { display: block; }
      .hero-metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .workflow-timeline { grid-template-columns: 1fr; }
      .footer-top { flex-direction: column; align-items: flex-start; }
    }