:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #e8f3ff;
      --accent: #00a870;
      --accent-warm: #ed7b2f;
      --text-main: #1d2129;
      --text-muted: #4e5969;
      --text-sub: #86909c;
      --bg-page: #f7f9fc;
      --bg-card: #ffffff;
      --border-color: #e5e6eb;
      --shadow-sm: 0 2px 6px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 18px rgba(0,82,217,0.08);
      --shadow-hover: 0 12px 28px rgba(0,82,217,0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0,82,217,0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      color: var(--primary-hover);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
    }
    .btn-accent:hover {
      background-color: #008f5e;
      color: #ffffff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 50%, #e8f3ff 100%);
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .badge-hero {
      display: inline-flex;
      align-items: center;
      background: #ffffff;
      color: var(--primary);
      padding: 6px 16px;
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 30px;
      border: 1px solid #cce3fe;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0c1c38;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .metric-card {
      background: #ffffff;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .metric-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--text-sub);
    }
    .section-wrap {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .intro-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .intro-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .intro-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #b5d7fe;
    }
    .intro-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .intro-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .intro-card p {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .service-badge {
      align-self: flex-start;
      background: #f2f3f5;
      color: var(--text-muted);
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card h3 {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 14px;
    }
    .service-taglist {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .service-taglist span {
      font-size: 0.78rem;
      background: var(--primary-light);
      color: var(--primary);
      padding: 2px 6px;
      border-radius: 4px;
    }
    .models-cloud-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      margin-top: 40px;
    }
    .models-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-main);
      text-align: center;
    }
    .models-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-chip {
      background: #f7f9fc;
      border: 1px solid #dcdfe6;
      color: #303133;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      transition: var(--transition);
    }
    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 14px;
      font-size: 1rem;
    }
    .step-card h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .eval-highlight {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .eval-item-score {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1;
      margin-bottom: 6px;
    }
    .eval-item-stars {
      color: #f7ba2a;
      font-size: 1.4rem;
      margin-bottom: 6px;
    }
    .eval-table-wrap {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .eval-table th {
      background: #f2f5fa;
      font-weight: 600;
      color: var(--text-main);
    }
    .eval-table tr:last-child td {
      border-bottom: none;
    }
    .eval-table .highlight-col {
      background: #f5f9ff;
      color: var(--primary);
      font-weight: 600;
    }
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .gallery-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .gallery-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e5e6eb;
      overflow: hidden;
    }
    .gallery-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .gallery-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .gallery-card:hover .gallery-img-wrap img {
      transform: scale(1.03);
    }
    .gallery-info {
      padding: 16px 20px;
    }
    .gallery-info h3 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .gallery-info p {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .promo-banners-wrap {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 30px;
    }
    .promo-banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .promo-banner-item img {
      width: 100%;
      height: auto;
      display: block;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .price-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }
    .price-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: scale(1.02);
    }
    .price-badge-top {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-warm);
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 12px;
    }
    .price-card h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    .price-rate {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin: 16px 0;
      line-height: 1;
    }
    .price-rate span {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 400;
    }
    .price-features {
      list-style: none;
      margin-bottom: 24px;
    }
    .price-features li {
      font-size: 0.9rem;
      color: var(--text-muted);
      padding: 6px 0;
      border-bottom: 1px dashed #f0f0f0;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .price-features li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 700;
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f7ba2a;
      margin-bottom: 10px;
      font-size: 0.9rem;
    }
    .review-content {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .reviewer-name {
      font-weight: 600;
      font-size: 0.92rem;
      color: var(--text-main);
    }
    .reviewer-title {
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafbfc;
      border-top: 1px solid transparent;
    }
    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      border-top-color: var(--border-color);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .article-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }
    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .article-info h3 {
      font-size: 1.02rem;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .article-info p {
      font-size: 0.85rem;
      color: var(--text-sub);
    }
    .article-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.88rem;
    }
    .form-section-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .form-info-col h3 {
      font-size: 1.5rem;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .form-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 24px;
    }
    .contact-methods {
      list-style: none;
      margin-bottom: 24px;
    }
    .contact-methods li {
      font-size: 0.92rem;
      margin-bottom: 12px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .contact-methods strong {
      color: var(--text-main);
    }
    .qr-box-small {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      background: #f7f9fc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 12px;
      gap: 8px;
    }
    .qr-box-small img {
      width: 120px;
      height: 120px;
      object-fit: contain;
      border-radius: 4px;
    }
    .qr-box-small span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .form-wrap {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background: #ffffff;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0,82,217,0.12);
    }
    .form-textarea {
      min-height: 100px;
      resize: vertical;
    }
    .site-footer {
      background-color: #0c1524;
      color: #9aa8bd;
      padding: 50px 0 30px;
      border-top: 1px solid #1a273c;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      padding-bottom: 30px;
      border-bottom: 1px solid #1f2f47;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 8px;
    }
    .footer-links-list a {
      color: #9aa8bd;
      font-size: 0.88rem;
    }
    .footer-links-list a:hover {
      color: #ffffff;
    }
    .footer-friend-links {
      padding: 20px 0;
      border-bottom: 1px solid #1f2f47;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.86rem;
    }
    .footer-friend-links span {
      color: #ffffff;
      font-weight: 600;
    }
    .footer-friend-links a {
      color: #9aa8bd;
    }
    .footer-friend-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #63738a;
    }
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: var(--transition);
      position: relative;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }
    .float-qr-popup {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-color);
      display: none;
      flex-direction: column;
      align-items: center;
      width: 140px;
    }
    .float-qr-popup img {
      width: 110px;
      height: 110px;
      display: block;
    }
    .float-qr-popup span {
      font-size: 0.78rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    .float-btn:hover .float-qr-popup {
      display: flex;
    }
    @media (max-width: 992px) {
      .hero-title { font-size: 2.1rem; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .intro-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow-steps { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .gallery-grid { grid-template-columns: repeat(2, 1fr); }
      .promo-banners-wrap { grid-template-columns: 1fr; }
      .form-section-wrap { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .header-actions { display: none; }
      .hero-title { font-size: 1.75rem; }
      .services-grid { grid-template-columns: 1fr; }
      .workflow-steps { grid-template-columns: 1fr; }
      .gallery-grid { grid-template-columns: 1fr; }
      .articles-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .eval-highlight { flex-direction: column; gap: 20px; }
    }