:root {
      --primary-grad: linear-gradient(135deg, #FF4D4D 0%, #F9CB28 25%, #70A2FF 50%, #7928CA 75%, #FF0080 100%);
      --rainbow-border: linear-gradient(90deg, #ff4e50, #f9d423, #00c6ff, #0072ff, #7928ca, #ff0080);
      --bg-light: #FAFBFC;
      --card-bg: #FFFFFF;
      --text-main: #1A1F2C;
      --text-muted: #5E6977;
      --brand-blue: #0066FF;
      --brand-purple: #7928CA;
      --brand-accent: #FF3366;
      --border-color: #E6EAF0;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 18px 40px rgba(121, 40, 202, 0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(255, 77, 77, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(0, 102, 255, 0.05) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(249, 203, 40, 0.03) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(121, 40, 202, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 90px 0;
    }
    .text-center {
      text-align: center;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.875rem;
      font-weight: 700;
      color: #333333;
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      border: 1px solid rgba(0, 102, 255, 0.15);
      margin-bottom: 16px;
      position: relative;
    }
    .section-badge::before {
      content: "";
      position: absolute;
      inset: -1px;
      border-radius: 30px;
      padding: 1px;
      background: var(--rainbow-border);
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 50px;
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 10px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-rainbow {
      background: linear-gradient(135deg, #0066FF 0%, #7928CA 50%, #FF0080 100%);
      color: #FFFFFF;
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.25);
    }
    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 28px rgba(121, 40, 202, 0.4);
      color: #FFFFFF;
    }
    .btn-outline {
      background: #FFFFFF;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-outline:hover {
      border-color: var(--brand-blue);
      color: var(--brand-blue);
      transform: translateY(-2px);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo-wrapper {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-wrapper .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li {
      margin: 0 4px;
    }
    .nav-links a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.935rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--brand-blue);
      background: rgba(0, 102, 255, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-main);
    }
    .menu-toggle svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
    }
    .hero-section {
      padding: 100px 0 80px;
      position: relative;
      overflow: hidden;
      text-align: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      background: #FFFFFF;
      border-radius: 40px;
      font-size: 0.9rem;
      font-weight: 700;
      color: #333333;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
      margin-bottom: 24px;
      border: 1px solid var(--border-color);
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: #00D26A;
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(0, 210, 106, 0.2);
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-gradient-text {
      background: linear-gradient(135deg, #FF3366 0%, #FF9900 25%, #0066FF 70%, #7928CA 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 40px;
      line-height: 1.8;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .hero-btn-main {
      padding: 16px 38px;
      font-size: 1.125rem;
      font-weight: 700;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0, 102, 255, 0.3);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .stat-card {
      background: #FFFFFF;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: all 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 102, 255, 0.3);
    }
    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .models-bar {
      padding: 40px 0;
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .models-title {
      font-size: 0.95rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--text-muted);
      margin-bottom: 20px;
      text-align: center;
    }
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1100px;
      margin: 0 auto;
    }
    .model-tag {
      padding: 6px 14px;
      background: #F4F6F9;
      border: 1px solid #E2E8F0;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      background: #FFFFFF;
      color: var(--brand-blue);
      border-color: var(--brand-blue);
      box-shadow: 0 2px 8px rgba(0, 102, 255, 0.15);
      transform: translateY(-1px);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 36px;
      align-items: center;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(121, 40, 202, 0.25);
    }
    .card-rainbow-top {
      position: relative;
      overflow: hidden;
    }
    .card-rainbow-top::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--rainbow-border);
    }
    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--brand-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: bold;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .service-badge {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      background: rgba(255, 51, 102, 0.1);
      color: var(--brand-accent);
      margin-bottom: 8px;
    }
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      position: relative;
    }
    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066FF, #7928CA);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .table-container {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
      padding: 8px;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th,
    .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      background: #F8FAFC;
    }
    .compare-table th.highlight-col,
    .compare-table td.highlight-col {
      background: rgba(0, 102, 255, 0.03);
      font-weight: 600;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #FF9900, #FF3366);
      color: #FFFFFF;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 800;
      font-size: 0.95rem;
    }
    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #F1F5F9;
      overflow: hidden;
    }
    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }
    .case-content {
      padding: 22px;
    }
    .case-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--brand-blue);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .case-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .review-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }
    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .review-stars {
      color: #FFB800;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }
    .review-body {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .form-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #F8FAFC;
      transition: all 0.2s ease;
      outline: none;
    }
    .form-control:focus {
      border-color: var(--brand-blue);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.12);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-item.active {
      border-color: rgba(0, 102, 255, 0.4);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-toggle-icon {
      font-size: 1.25rem;
      color: var(--brand-blue);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 400px;
      padding-bottom: 20px;
      transition: max-height 0.35s cubic-bezier(0.5, 0, 1, 0);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }
    .article-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: block;
      transition: all 0.25s ease;
    }
    .article-item:hover {
      transform: translateY(-3px);
      border-color: var(--brand-blue);
      box-shadow: var(--shadow-md);
    }
    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .article-meta {
      font-size: 0.8rem;
      color: #94A3B8;
    }
    .contact-card-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .qr-img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      padding: 6px;
      margin-bottom: 16px;
      background: #FFF;
    }
    .site-footer {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand p {
      margin-top: 12px;
      line-height: 1.7;
      max-width: 320px;
    }
    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul a:hover {
      color: var(--brand-blue);
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }
    .friend-links a {
      color: var(--text-muted);
      font-size: 0.85rem;
      padding: 4px 10px;
      background: #F1F5F9;
      border-radius: 4px;
    }
    .friend-links a:hover {
      color: var(--brand-blue);
      background: #E2E8F0;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }
    .float-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }
    .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;
      color: var(--text-main);
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--brand-blue);
      color: #FFFFFF;
      transform: scale(1.08);
    }
    .float-btn svg {
      width: 20px;
      height: 20px;
      fill: currentColor;
    }
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.6rem;
      }
      .grid-4, .hero-stats-grid, .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        margin: 4px 0;
      }
      .nav-links a {
        display: block;
        width: 100%;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .grid-2, .grid-3, .grid-4, .reviews-grid, .hero-stats-grid, .steps-container, .articles-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
      .form-wrapper {
        padding: 24px;
      }
    }