:root {
      --bg-main: #f5faf7;
      --bg-card: #ffffff;
      --bg-alt: #ebf6f0;
      --primary: #0f8a5f;
      --primary-hover: #0b6b4a;
      --primary-light: #d1f2e2;
      --accent: #10b981;
      --accent-subtle: #e6f7ef;
      --text-main: #14241d;
      --text-muted: #4a6356;
      --border-color: #d6e8dd;
      --shadow-sm: 0 4px 12px rgba(15, 138, 95, 0.05);
      --shadow-md: 0 8px 24px rgba(15, 138, 95, 0.08);
      --radius: 12px;
    }
    * {
      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-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.25s ease, opacity 0.25s ease;
    }
    a:hover {
      color: var(--primary-hover);
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(245, 250, 247, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      width: 100%;
    }
    .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;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: var(--accent-subtle);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      background: var(--primary);
      color: #ffffff !important;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: 8px;
      box-shadow: 0 4px 10px rgba(15, 138, 95, 0.2);
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-portal:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      color: var(--text-main);
    }
    main {
      flex: 1;
      width: 100%;
    }
    .section-wrap {
      padding: 64px 0;
      width: 100%;
      border-bottom: 1px solid rgba(214, 232, 221, 0.6);
    }
    .section-head {
      text-align: center;
      margin-bottom: 44px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: var(--accent-subtle);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 10px;
      border: 1px solid var(--border-color);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      margin-top: 10px;
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 10%, #e1f5ec 0%, #f5faf7 70%);
      text-align: center;
    }
    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .btn-main-hero {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 8px;
      background: var(--primary);
      color: #ffffff !important;
      box-shadow: 0 6px 20px rgba(15, 138, 95, 0.25);
      transition: all 0.25s ease;
    }
    .btn-main-hero:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(15, 138, 95, 0.3);
    }
    .btn-sec-hero {
      padding: 13px 30px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 8px;
      background: #ffffff;
      color: var(--primary) !important;
      border: 1px solid var(--border-color);
      transition: all 0.25s ease;
    }
    .btn-sec-hero:hover {
      background: var(--accent-subtle);
      border-color: var(--primary);
    }
    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .stat-val {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    .grid-cards {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .base-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .base-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .card-tag {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--accent-subtle);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 12px;
    }
    .card-h3 {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .media-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .media-img-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: var(--bg-alt);
      overflow: hidden;
    }
    .media-img-box.square {
      aspect-ratio: 1 / 1;
    }
    .media-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .media-content {
      padding: 22px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    table.data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    table.data-table th,
    table.data-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    table.data-table th {
      background: var(--bg-alt);
      color: var(--text-main);
      font-weight: 600;
    }
    table.data-table tr:hover {
      background: #fafdfb;
    }
    .highlight-cell {
      color: var(--primary);
      font-weight: 600;
    }
    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #ecfdf5;
      color: #065f46;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      border: 1px solid #a7f3d0;
      margin-bottom: 20px;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .tag-item {
      background: var(--bg-card);
      color: var(--text-muted);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
    }
    .tag-item.active {
      background: var(--primary-light);
      color: var(--primary);
      border-color: var(--accent);
    }
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-btn {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: none;
      border: none;
      outline: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
    }
    .faq-btn:hover {
      background: var(--accent-subtle);
    }
    .faq-content {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      display: none;
    }
    .faq-item.active .faq-content {
      display: block;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .form-box {
      max-width: 680px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: var(--bg-main);
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    .form-submit-btn {
      width: 100%;
      padding: 14px;
      background: var(--primary);
      color: #ffffff;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.25s ease;
    }
    .form-submit-btn:hover {
      background: var(--primary-hover);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }
    .article-link-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      display: block;
      color: var(--text-main);
      font-size: 0.92rem;
      transition: all 0.2s ease;
    }
    .article-link-card:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    footer.site-footer {
      background: #192d24;
      color: #c9ded5;
      padding: 60px 0 24px;
      margin-top: auto;
      width: 100%;
      border-top: 1px solid #284437;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 0.9rem;
      color: #a4c2b5;
      line-height: 1.6;
      max-width: 320px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 14px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 8px;
    }
    .footer-col ul li a {
      color: #a4c2b5;
      font-size: 0.88rem;
    }
    .footer-col ul li a:hover {
      color: #34d399;
    }
    .footer-qr {
      max-width: 90px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }
    .footer-qr img {
      width: 100%;
      height: auto;
      display: block;
    }
    .footer-links-box {
      border-top: 1px solid #284437;
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .footer-links-box h6 {
      font-size: 0.88rem;
      color: #ffffff;
      margin-bottom: 10px;
    }
    .friend-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-row a {
      color: #92b8a7;
      font-size: 0.85rem;
    }
    .friend-links-row a:hover {
      color: #34d399;
    }
    .footer-bottom {
      border-top: 1px solid #284437;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #7b9e8e;
    }
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 44px;
      height: 44px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      color: var(--primary);
      position: relative;
    }
    .float-btn:hover {
      background: var(--accent-subtle);
    }
    .qr-popup {
      position: absolute;
      right: 54px;
      bottom: 0;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 10px;
      box-shadow: var(--shadow-md);
      display: none;
      width: 140px;
      text-align: center;
    }
    .qr-popup img {
      width: 100%;
      height: auto;
      display: block;
    }
    .qr-popup p {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    .float-btn:hover .qr-popup {
      display: block;
    }
    @media (max-width: 992px) {
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 14px;
      }
      .hero-h1 {
        font-size: 1.85rem;
      }
      .timeline {
        grid-template-columns: 1fr;
      }
      .stats-bar {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }