:root {
      --primary: #ff4d00;
      --primary-hover: #e04400;
      --secondary: #0052ff;
      --accent: #00d285;
      --accent-warm: #ffaa00;
      --dark: #121826;
      --gray-deep: #2d3748;
      --gray-text: #4a5568;
      --gray-light: #f4f6fb;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #ff4d00;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(18, 24, 38, 0.04);
      --shadow-md: 0 10px 30px rgba(18, 24, 38, 0.08);
      --shadow-hover: 0 18px 40px rgba(255, 77, 0, 0.12);
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 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, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #fafbfe;
      color: var(--gray-text);
      line-height: 1.6;
      overflow-x: hidden;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    header, main, footer, section {
      width: 100%;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      padding: 4px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 0.5px;
    }
    .badge-primary {
      background: rgba(255, 77, 0, 0.1);
      color: var(--primary);
    }
    .badge-secondary {
      background: rgba(0, 82, 255, 0.1);
      color: var(--secondary);
    }
    .badge-accent {
      background: rgba(0, 210, 133, 0.15);
      color: #008753;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition);
      text-align: center;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(255, 77, 0, 0.35);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255, 77, 0, 0.45);
    }
    .btn-secondary {
      background-color: var(--secondary);
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(0, 82, 255, 0.3);
    }
    .btn-secondary:hover {
      background-color: #0043d0;
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--gray-deep);
      color: var(--dark);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(255, 77, 0, 0.05);
    }
    .section-title-wrap {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--dark);
      margin-top: 10px;
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--gray-text);
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-link {
      padding: 10px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--gray-deep);
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }
    .nav-link:hover {
      color: var(--primary);
      background-color: rgba(255, 77, 0, 0.06);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark);
    }
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(135deg, #fff7f2 0%, #f0f4ff 50%, #f4fbf7 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--dark);
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-h1 span.highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--gray-deep);
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .stat-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--gray-text);
      font-weight: 500;
    }
    .py-section {
      padding: 80px 0;
    }
    .bg-light {
      background-color: #f7f9fd;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      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-feature {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .card-feature:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255, 77, 0, 0.3);
    }
    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }
    .icon-orange {
      background: rgba(255, 77, 0, 0.12);
      color: var(--primary);
    }
    .icon-blue {
      background: rgba(0, 82, 255, 0.12);
      color: var(--secondary);
    }
    .icon-green {
      background: rgba(0, 210, 133, 0.15);
      color: var(--accent);
    }
    .icon-yellow {
      background: rgba(255, 170, 0, 0.15);
      color: var(--accent-warm);
    }
    .card-title {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .card-desc {
      font-size: 0.95rem;
      color: var(--gray-text);
      line-height: 1.6;
      flex-grow: 1;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }
    .tag-item {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--gray-deep);
      transition: var(--transition);
    }
    .tag-item:hover {
      background: var(--primary);
      color: #ffffff;
      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);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--dark);
      font-size: 1rem;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-highlight {
      background: rgba(255, 77, 0, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .score-badge {
      display: inline-flex;
      align-items: center;
      background: linear-gradient(135deg, #ff4d00, #ffaa00);
      color: #ffffff;
      padding: 6px 16px;
      border-radius: 999px;
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(255, 77, 0, 0.3);
    }
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .timeline-step {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
      text-align: center;
    }
    .timeline-number {
      width: 44px;
      height: 44px;
      background: var(--secondary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      margin: 0 auto 16px;
    }
    .review-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .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, var(--secondary), var(--primary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .review-user {
      font-weight: 700;
      color: var(--dark);
      font-size: 1rem;
    }
    .review-role {
      font-size: 0.85rem;
      color: var(--gray-text);
    }
    .review-stars {
      color: var(--accent-warm);
      margin-bottom: 12px;
      font-size: 0.9rem;
    }
    .review-text {
      font-size: 0.95rem;
      line-height: 1.6;
      color: var(--gray-deep);
      flex-grow: 1;
    }
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      transition: var(--transition);
    }
    .faq-question:hover {
      color: var(--primary);
      background-color: rgba(255, 77, 0, 0.02);
    }
    .faq-arrow {
      font-size: 1.1rem;
      transition: transform 0.3s ease;
      color: var(--gray-text);
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray-text);
      font-size: 0.95rem;
      line-height: 1.6;
      display: none;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .form-card {
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--dark);
      font-size: 0.95rem;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 1rem;
      color: var(--dark);
      background-color: #ffffff;
      transition: var(--transition);
      outline: none;
    }
    .form-control:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(255, 77, 0, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }
    .contact-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(0, 82, 255, 0.1);
      color: var(--secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      flex-shrink: 0;
    }
    .qr-wrap {
      margin-top: 16px;
      width: 140px;
      padding: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .article-link-item {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--gray-deep);
      transition: var(--transition);
      font-weight: 500;
    }
    .article-link-item:hover {
      border-color: var(--secondary);
      color: var(--secondary);
      background: rgba(0, 82, 255, 0.05);
    }
    .image-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 24px;
    }
    .gallery-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .site-footer {
      background-color: #0f141f;
      color: #a0aec0;
      padding: 60px 0 30px;
      border-top: 1px solid #1a202c;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 20px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #a0aec0;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-box a {
      color: #cbd5e0;
      font-size: 0.88rem;
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.05);
      border-radius: 4px;
    }
    .friend-links-box a:hover {
      color: var(--primary);
      background: rgba(255, 255, 255, 0.1);
    }
    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      text-align: center;
      font-size: 0.85rem;
      color: #718096;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border-radius: 999px;
      padding: 8px 16px 8px 12px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      transition: var(--transition);
    }
    .floating-kefu:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(255, 77, 0, 0.25);
    }
    .kefu-icon-dot {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }
    .kefu-text {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--dark);
    }
    @media (max-width: 992px) {
      .hero-h1 {
        font-size: 2.2rem;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    @media (max-width: 768px) {
      .grid-2, .grid-3, .grid-4, .timeline, .hero-stats-grid, .footer-grid, .image-gallery {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .form-card {
        padding: 24px;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }