body {
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 18px;
    line-height: 1.8;
    color: #1a1a1a;
    max-width: 780px;
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem;
    background: #fff;
  }
  h2 {
    font-size: 1.45rem;
    margin-top: 3rem;
    margin-bottom: 0.75rem;
    border-bottom: 2px solid #ececec;
    padding-bottom: 0.4rem;
    font-weight: 700;
  }
  h3 { font-size: 1.1rem; margin-top: 2rem; margin-bottom: 0.5rem; font-weight: 700; }
  p { margin: 0 0 1.25rem; }
  ul, ol { margin: 0 0 1.25rem 1.6rem; }
  li { margin-bottom: 0.6rem; }
  strong { font-weight: 700; }
  code {
    font-family: 'Courier New', monospace;
    font-size: 0.88em;
    background: #f0f0f0;
    padding: 0.1em 0.35em;
    border-radius: 3px;
    color: #c0392b;
  }
  pre {
    background: #1a1a1a;
    color: #f0f0f0;
    padding: 1.2rem 1.4rem;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.82rem;
    line-height: 1.65;
    margin: 1.5rem 0;
  }
  pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

  .byline { color: #555; font-size: 0.9rem; margin-bottom: 0.3rem; font-family: -apple-system, sans-serif; }
  .subtitle { font-size: 1.05rem; color: #444; font-style: italic; margin-bottom: 2rem; margin-top: 0.5rem; }

  .definition-block {
    background: #f5f5f5;
    border-left: 5px solid #111;
    padding: 1.25rem 1.6rem;
    margin: 2rem 0;
    border-radius: 0 6px 6px 0;
  }
  .definition-block p { margin: 0 0 0.5rem; }
  .definition-block p:last-child { margin: 0; }
  .definition-block .label {
    font-family: -apple-system, sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #666;
    margin-bottom: 0.5rem;
    display: block;
  }

  .callout {
    background: #fffbf0;
    border-left: 5px solid #d4a012;
    padding: 1.1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 6px 6px 0;
  }
  .callout.blue {
    background: #f0f4ff;
    border-left-color: #2E75B6;
  }
  .callout p { margin: 0 0 0.5rem; }
  .callout p:last-child { margin: 0; }

  .geolab-toc {
    background: #f8f8f8;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.1rem 1.4rem;
    margin: 1.75rem 0 2rem;
    font-family: -apple-system, sans-serif;
    font-size: 0.9rem;
  }
  .geolab-toc .toc-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: #888;
    margin-bottom: 0.6rem;
    display: block;
  }
  .geolab-toc ol { margin: 0; padding-left: 1.3rem; }
  .geolab-toc li { margin-bottom: 0.3rem; }
  .geolab-toc a { color: #2E75B6; text-decoration: none; }
  .geolab-toc a:hover { text-decoration: underline; }

  .layer-badge {
    display: inline-block;
    background: #534AB7;
    color: #fff;
    font-family: -apple-system, sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.7rem;
    border-radius: 4px;
    letter-spacing: 0.04em;
    margin-bottom: 0.5rem;
  }

  .comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0 2rem;
    font-family: -apple-system, sans-serif;
    font-size: 0.9rem;
  }
  .comparison-table th {
    padding: 0.7rem 1rem;
    text-align: left;
    font-weight: 700;
    font-size: 0.82rem;
    background: #111;
    color: #fff;
  }
  .comparison-table th:first-child { border-radius: 6px 0 0 0; }
  .comparison-table th:last-child  { border-radius: 0 6px 0 0; }
  .comparison-table td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid #efefef;
    vertical-align: top;
    line-height: 1.5;
  }
  .comparison-table td:first-child { font-weight: 700; color: #444; }
  .comparison-table tr:last-child td { border-bottom: none; }
  .comparison-table tr:nth-child(even) td { background: #f8f8f8; }

  .steps-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 2rem;
    counter-reset: steps;
  }
  .steps-list li {
    counter-increment: steps;
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid #efefef;
    margin: 0;
    align-items: flex-start;
  }
  .steps-list li:first-child { border-top: 1px solid #efefef; }
  .steps-list li::before {
    content: counter(steps);
    font-family: -apple-system, sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    background: #534AB7;
    color: #fff;
    min-width: 1.6rem;
    height: 1.6rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.15rem;
  }
  .steps-list li div { flex: 1; }
  .steps-list li strong { display: block; margin-bottom: 0.2rem; }

  .key-takeaway {
    background: #111;
    color: #fff;
    padding: 1.5rem 1.75rem;
    border-radius: 8px;
    margin: 2.5rem 0;
    font-family: -apple-system, sans-serif;
  }
  .kt-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #d4a012;
    margin-bottom: 0.75rem;
    display: block;
  }
  .key-takeaway p { margin: 0 0 0.6rem; color: #f0f0f0; font-size: 0.97rem; line-height: 1.65; }
  .key-takeaway p:last-child { margin: 0; }

  .testimonial-card {
    background: #f8fafc;
    border-left: 4px solid #2E75B6;
    padding: 1.25rem 1.5rem;
    margin: 1rem 0;
    border-radius: 0 4px 4px 0;
    font-family: -apple-system, sans-serif;
  }
  .testimonial-card p { margin: 0 0 0.5rem; font-style: italic; font-size: 0.95rem; }
  .testimonial-card .attribution { font-size: 0.85rem; color: #666; margin: 0; font-style: normal; }

  figure { margin: 2rem 0; text-align: center; }
  figcaption {
    font-family: -apple-system, sans-serif;
    font-size: 0.82rem;
    color: #888;
    margin-top: 0.6rem;
    font-style: italic;
  }

  .faq-item { margin-bottom: 1.75rem; }
  .faq-item h3 { margin-bottom: 0.5rem; font-size: 1.05rem; }

  .meta-section {
    font-family: -apple-system, sans-serif;
    font-size: 0.88rem;
    color: #555;
    border-top: 1px solid #e0e0e0;
    padding-top: 1.5rem;
    margin-top: 3rem;
  }
  .meta-section h2 {
    font-size: 1rem;
    font-family: -apple-system, sans-serif;
    border: none;
    margin-top: 1.5rem;
    padding: 0;
    color: #333;
  }
  .meta-section ul { margin-left: 1.2rem; }
  .meta-section li { margin-bottom: 0.3rem; }

  .author-bio {
    background: #f8f8f8;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin-top: 2.5rem;
    font-family: -apple-system, sans-serif;
    font-size: 0.9rem;
    color: #444;
  }
  .author-bio p { margin: 0 0 0.5rem; }
  .author-bio p:last-child { margin: 0; }

  @media (max-width: 580px) {
    body { font-size: 17px; }
    .comparison-table { font-size: 0.82rem; }
  }