:root {
      --primary: #008f8c;
      --primary-dark: #015958;
      --primary-light: #e6f6f5;
      --accent: #0cbaba;
      --text-main: #192a3e;
      --text-muted: #5c6b7d;
      --bg-page: #f6faf9;
      --bg-card: #ffffff;
      --border-color: #d8e8e6;
      --shadow-sm: 0 4px 12px rgba(0, 143, 140, 0.06);
      --shadow-md: 0 10px 25px rgba(0, 143, 140, 0.1);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-max: 1200px;
    }
    * {
      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;
      background-image: radial-gradient(#d6edea 1px, transparent 1px), radial-gradient(#e3f4f2 1px, var(--bg-page) 1px);
      background-size: 40px 40px;
      background-position: 0 0, 20px 20px;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    header.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-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-area .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.92rem;
      font-weight: 500;
      padding: 8px 10px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.2;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 143, 140, 0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      box-shadow: 0 6px 18px rgba(0, 143, 140, 0.35);
      transform: translateY(-1px);
      color: #ffffff;
    }
    .btn-outline {
      background-color: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      color: var(--primary-dark);
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid rgba(0, 143, 140, 0.08);
    }
    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background-color: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 10px;
      border: 1px solid rgba(0, 143, 140, 0.2);
    }
    .section-title {
      font-size: 1.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto;
    }
    .hero-section {
      padding: 85px 0 60px 0;
      background: linear-gradient(180deg, #eefbf9 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 0.85rem;
      color: var(--primary-dark);
      font-weight: 600;
      margin-bottom: 20px;
      box-shadow: var(--shadow-sm);
    }
    .hero-title {
      font-size: 2.35rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 18px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.12rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }
    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 30px;
    }
    .hero-grid-tags {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }
    .hero-feature-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: left;
    }
    .hero-feature-item h3 {
      font-size: 0.98rem;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }
    .hero-feature-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 24px;
    }
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .card-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      font-weight: bold;
    }
    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .banner-container {
      margin-top: 30px;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
      padding: 12px;
    }
    .banner-container img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-sm);
    }
    .grid-2col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 15px;
    }
    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 5px 11px;
      border-radius: 4px;
      font-size: 0.82rem;
      color: var(--text-main);
      font-weight: 500;
    }
    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary-dark);
      background: var(--primary-light);
    }
    .table-wrapper {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-top: 20px;
    }
    table.custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    table.custom-table th, table.custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    table.custom-table th {
      background-color: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
    }
    table.custom-table tr:hover {
      background-color: #fbfdfd;
    }
    .highlight-cell {
      color: var(--primary-dark);
      font-weight: 700;
    }
    .rating-banner {
      background: linear-gradient(135deg, #015958 0%, #008f8c 100%);
      color: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 25px;
      flex-wrap: wrap;
      gap: 15px;
    }
    .rating-score {
      font-size: 2.2rem;
      font-weight: 800;
      color: #ffd166;
    }
    .step-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px auto;
    }
    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .step-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 20px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    .review-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }
    .review-author {
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }
    .review-role {
      font-size: 0.8rem;
      color: var(--primary);
      background: var(--primary-light);
      padding: 2px 8px;
      border-radius: 4px;
    }
    .review-body {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      font-size: 0.98rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
      transition: background-color 0.2s ease;
    }
    .faq-question:hover {
      background-color: var(--primary-light);
    }
    .faq-toggle-icon {
      font-size: 1.1rem;
      color: var(--primary);
      transition: transform 0.2s ease;
    }
    .faq-answer {
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fcfefe;
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.6;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 20px;
      border-top-color: var(--border-color);
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-md);
      max-width: 650px;
      margin: 0 auto;
    }
    .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: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
      background: #fafdfd;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .footer-section {
      background: #0d1e23;
      color: #b5c7cb;
      padding: 50px 0 25px 0;
      border-top: 3px solid var(--primary);
      font-size: 0.88rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a {
      color: #b5c7cb;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: #0cbaba;
    }
    .footer-qr {
      text-align: center;
      max-width: 130px;
    }
    .footer-qr img {
      width: 100%;
      height: auto;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }
    .footer-bottom {
      border-top: 1px solid #1a323a;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
    }
    .friend-links a {
      color: #8da3a8;
      text-decoration: none;
      font-size: 0.82rem;
    }
    .friend-links a:hover {
      color: #0cbaba;
    }
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      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;
      color: var(--primary-dark);
      text-decoration: none;
      font-weight: 700;
      font-size: 0.85rem;
      transition: all 0.25s ease;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }
    @media (max-width: 992px) {
      .grid-2col {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 15px 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }