:root {
      --primary: #1d4ed8;
      --primary-hover: #1e40af;
      --primary-light: #eff6ff;
      --primary-border: #bfdbfe;
      --secondary: #0284c7;
      --accent: #f59e0b;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-main: #ffffff;
      --bg-alt: #f8fafc;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      color: var(--text-main);
      background-color: var(--bg-alt);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
    }
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      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;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(29, 78, 216, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      box-shadow: 0 6px 14px rgba(29, 78, 216, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background-color: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      color: var(--primary-hover);
    }
    .btn-lg {
      padding: 14px 28px;
      font-size: 16px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }
    .hero-section {
      background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #f0f9ff 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--primary-border);
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-title {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 960px;
      margin: 0 auto;
    }
    .stat-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .stat-val {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-light);
    }
    .section-wrap {
      padding: 70px 0;
      background-color: var(--bg-alt);
    }
    .section-wrap.white {
      background-color: #ffffff;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 28px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-border);
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .feature-badge {
      display: inline-block;
      padding: 3px 8px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 600;
    }
    .models-cloud {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .tag-item {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .tag-item:hover {
      background: var(--primary-light);
      border-color: var(--primary-border);
      color: var(--primary);
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .data-table th, .data-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .data-table th {
      background-color: #f1f5f9;
      color: var(--text-main);
      font-weight: 700;
    }
    .data-table tr:last-child td {
      border-bottom: none;
    }
    .data-table tr:hover {
      background-color: var(--primary-light);
    }
    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
    }
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      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: 800;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .step-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .gallery-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .gallery-media {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #e2e8f0;
    }
    .gallery-media.square {
      aspect-ratio: 1 / 1;
    }
    .gallery-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .gallery-item:hover .gallery-media img {
      transform: scale(1.03);
    }
    .gallery-body {
      padding: 20px;
      flex-grow: 1;
    }
    .gallery-body h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .gallery-body p {
      font-size: 13px;
      color: var(--text-muted);
    }
    .score-card {
      background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 30px;
      box-shadow: var(--shadow-lg);
    }
    .score-big {
      font-size: 56px;
      font-weight: 900;
      line-height: 1;
      color: #fbbf24;
    }
    .score-label {
      font-size: 14px;
      color: #dbeafe;
      margin-top: 4px;
    }
    .score-stars {
      color: #fbbf24;
      font-size: 20px;
      margin-bottom: 8px;
    }
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question:hover {
      background-color: var(--primary-light);
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: var(--transition);
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      padding: 0 24px 20px;
      max-height: 300px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .user-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-role {
      font-size: 12px;
      color: var(--text-light);
    }
    .review-content {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .contact-form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background-color: var(--bg-alt);
      color: var(--text-main);
      font-family: inherit;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
    }
    .qr-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .qr-img-wrap {
      width: 160px;
      height: 160px;
      margin: 16px auto;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: var(--radius-md);
      background: #ffffff;
    }
    .qr-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      border-top: 1px solid #1e293b;
      font-size: 13px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding: 20px 0;
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }
    .friend-links-box span {
      color: #cbd5e1;
      font-weight: 600;
    }
    .friend-links-box a {
      color: #94a3b8;
      font-size: 13px;
    }
    .friend-links-box a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 18px;
      font-weight: bold;
      transition: var(--transition);
      text-decoration: none;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }
    @media (max-width: 992px) {
      .grid-4, .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 26px;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .grid-2, .gallery-grid, .steps-container {
        grid-template-columns: 1fr;
      }
      .score-card {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        padding: 16px 20px;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
    }