:root {
      --primary: #0ca678;
      --primary-dark: #099268;
      --primary-light: #e6fcf5;
      --primary-tint: #c3fae8;
      --mint-accent: #20c997;
      --mint-bg: #f4fbf7;
      --surface: #ffffff;
      --surface-alt: #f8faf9;
      --text-main: #1c2a24;
      --text-muted: #52635c;
      --border: #d3f9e8;
      --border-dark: #a9e8cf;
      --shadow-sm: 0 2px 8px rgba(12, 166, 120, 0.05);
      --shadow-md: 0 8px 24px rgba(12, 166, 120, 0.08);
      --shadow-lg: 0 16px 36px rgba(12, 166, 120, 0.12);
      --radius: 12px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--mint-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--primary-dark);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-nav-primary {
      background: var(--primary);
      color: #fff !important;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(12, 166, 120, 0.2);
    }

    .btn-nav-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    .section {
      padding: 80px 0;
    }

    .section-alt {
      background: var(--surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 30px;
      text-transform: uppercase;
      margin-bottom: 12px;
      border: 1px solid var(--border);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .hero-section {
      padding: 90px 0 80px 0;
      background: radial-gradient(circle at 50% 20%, #d3f9e8 0%, #f4fbf7 65%);
      position: relative;
    }

    .hero-content {
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-dark);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.88rem;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.6rem;
      line-height: 1.3;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn-main-primary {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary);
      color: #ffffff;
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 30px;
      box-shadow: 0 8px 20px rgba(12, 166, 120, 0.25);
    }

    .btn-main-primary:hover {
      background: var(--primary-dark);
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(12, 166, 120, 0.3);
    }

    .btn-main-secondary {
      display: inline-flex;
      align-items: center;
      background: #ffffff;
      color: var(--primary-dark);
      border: 1px solid var(--border-dark);
      padding: 14px 28px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 30px;
    }

    .btn-main-secondary:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      max-width: 960px;
      margin: 0 auto;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .metric-value {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .platform-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .intro-text-box h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .intro-text-box p {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .intro-feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .intro-feature-list li {
      font-size: 0.92rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-main);
    }

    .intro-feature-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    .intro-visual-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-md);
    }

    .model-tags-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .model-tag {
      font-size: 0.8rem;
      background: var(--surface-alt);
      color: var(--text-muted);
      border: 1px solid var(--border);
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 500;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 26px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      border-color: var(--mint-accent);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .service-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      font-weight: bold;
    }

    .service-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .service-tag {
      font-size: 0.78rem;
      color: var(--primary-dark);
      background: var(--primary-light);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      font-weight: 600;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-img-container {
      width: 100%;
      background: var(--surface-alt);
      overflow: hidden;
    }

    .media-img-container img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-img-container img {
      transform: scale(1.03);
    }

    .media-body {
      padding: 20px;
    }

    .media-body h4 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .media-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
    }

    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-tint);
      position: absolute;
      right: 18px;
      top: 14px;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      position: relative;
      z-index: 1;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      position: relative;
      z-index: 1;
    }

    .rating-highlight-box {
      background: #ffffff;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 28px;
      text-align: center;
      max-width: 560px;
      margin: 0 auto 36px auto;
      box-shadow: var(--shadow-sm);
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 6px;
    }

    .rating-stars {
      color: #fab005;
      font-size: 1.3rem;
      letter-spacing: 2px;
      margin-bottom: 8px;
    }

    .table-container {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 0.92rem;
    }

    .comparison-table th {
      background: var(--primary-light);
      font-weight: 700;
      color: var(--primary-dark);
    }

    .comparison-table tr:last-child td {
      border-bottom: none;
    }

    .comparison-table tr:hover td {
      background: var(--surface-alt);
    }

    .col-highlight {
      background: rgba(12, 166, 120, 0.04);
      font-weight: 600;
      color: var(--primary-dark);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px 24px;
      text-align: center;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .pricing-card.featured::before {
      content: "推荐方案";
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 12px;
    }

    .pricing-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .pricing-amount {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin: 16px 0;
    }

    .pricing-amount span {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-muted);
    }

    .pricing-features {
      list-style: none;
      text-align: left;
      margin: 20px 0;
      font-size: 0.9rem;
    }

    .pricing-features li {
      padding: 8px 0;
      border-bottom: 1px dashed var(--border);
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pricing-features li::before {
      content: "•";
      color: var(--primary);
      font-size: 1.2rem;
    }

    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .review-meta h5 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .review-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-body {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--mint-accent);
    }

    .faq-header {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid var(--surface-alt);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-side h3 {
      font-size: 1.5rem;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .contact-detail-list {
      list-style: none;
      margin-bottom: 24px;
    }

    .contact-detail-list li {
      margin-bottom: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-box {
      background: var(--surface-alt);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 16px;
      display: inline-block;
      text-align: center;
      max-width: 170px;
    }

    .qr-box img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    .qr-box span {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.95rem;
      background: var(--surface-alt);
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(12, 166, 120, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #ffffff;
      border: none;
      padding: 14px;
      border-radius: 6px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      transition: background 0.2s ease;
    }

    .btn-submit:hover {
      background: var(--primary-dark);
    }

    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 16px;
      border-radius: 8px;
      font-size: 0.9rem;
    }

    .article-item a {
      color: var(--text-main);
      font-weight: 600;
      display: block;
      margin-bottom: 6px;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border);
      padding: 60px 0 30px 0;
      color: var(--text-main);
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .friend-links-area {
      border-top: 1px solid var(--surface-alt);
      padding: 20px 0;
      font-size: 0.85rem;
      color: var(--text-muted);
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links-area a {
      color: var(--text-muted);
    }

    .friend-links-area a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--surface-alt);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .float-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      border: 1px solid var(--border-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: all 0.25s ease;
      font-size: 1.1rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    @media (max-width: 992px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .flow-steps { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .platform-intro-grid { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; }
      .footer-content { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-links.active { display: flex; }
      .nav-links li { width: 100%; text-align: center; }
      .nav-links li a { display: block; padding: 10px; }
      .hero-title { font-size: 2rem; }
      .section-title { font-size: 1.7rem; }
      .grid-3, .grid-4, .hero-metrics, .flow-steps { grid-template-columns: 1fr; }
      .footer-content { grid-template-columns: 1fr; }
    }