html { scroll-behavior: smooth; }
  h2[id], #overview { scroll-margin-top: 70px; }
  .section-nav { display: flex; gap: 6px; overflow-x: auto; margin-bottom: 20px; padding-bottom: 4px; }
  .section-nav a { background: #f1f1f1; color: #444; font-size: 12px; font-weight: 600; padding: 6px 12px; border-radius: 20px; text-decoration: none; white-space: nowrap; flex-shrink: 0; }
  .section-nav a:hover { background: #e5e5e5; }
  body { font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif; max-width: 800px; margin: 0 auto; padding: 24px 16px 60px; color: #1a1a1a; line-height: 1.6; }
  .sticky-header { position: sticky; top: 0; z-index: 50; background: #fff; padding: 8px 0 6px; margin-bottom: 12px; box-shadow: 0 2px 6px rgba(0,0,0,0.04); }
  .crumbs-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
  .crumbs { font-size: 13px; color: #767676; }
  .switch { position: relative; display: inline-block; width: 40px; height: 22px; flex-shrink: 0; }
  .switch input { opacity: 0; width: 0; height: 0; }
  .switch .slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; border-radius: 22px; transition: 0.2s; }
  .switch .slider::before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: #fff; border-radius: 50%; transition: 0.2s; }
  .switch input:checked + .slider { background-color: #2AABEE; }
  .switch input:checked + .slider::before { transform: translateX(18px); }
  .crumbs a { color: #767676; text-decoration: none; }
  .header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
  .avatar { width: 56px; height: 56px; border-radius: 50%; background: #f1f1f1; display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 22px; }
  h1 { font-size: 24px; margin: 0 0 6px; }
  .tags { display: flex; gap: 6px; flex-wrap: wrap; }
  .tag { background: #f1f1f1; color: #444; font-size: 12px; padding: 3px 10px; border-radius: 6px; }
  .join-btn { margin-left: auto; background: #2AABEE; color: #fff; border: none; padding: 10px 18px; border-radius: 6px; font-size: 14px; text-decoration: none; white-space: nowrap; }
  .subnote { font-size: 12px; color: #999; margin: 0 0 24px; }
  .stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 28px; }
  .stat-card { background: #f7f7f7; border-radius: 8px; padding: 14px; overflow: hidden; }
  .stat-label { font-size: 13px; color: #666; margin: 0 0 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .stat-value { font-size: 22px; font-weight: 600; margin: 0; word-break: break-word; }
  h2 { font-size: 18px; margin: 28px 0 10px; }
  p.body { font-size: 14px; color: #333; }
  .about-sections { display: flex; flex-direction: column; gap: 16px; }
  .about-section h3 { font-size: 14px; font-weight: 600; margin: 0 0 4px; color: #555; }
  .about-section p.body { margin: 0; }
  .pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 24px; }
  .pc-card { background: #f7f7f7; border-radius: 8px; padding: 12px 14px; }
  .pc-title { font-size: 13px; font-weight: 600; margin: 0 0 8px; color: #555; }
  .pc-body { font-size: 13px; margin: 0; }
  .pc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
  .pc-list li { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; line-height: 1.5; }
  .pc-icon { flex-shrink: 0; font-size: 12px; font-weight: 700; width: 16px; text-align: center; margin-top: 2px; }
  .pc-pros .pc-icon { color: #2e9e5b; }
  .pc-cons .pc-icon { color: #d64545; }
  .similar { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; }
  .similar-card { border: 1px solid #e5e5e5; border-radius: 10px; padding: 12px; text-decoration: none; color: inherit; display: flex; align-items: center; gap: 10px; }
  .similar-avatar { width: 36px; height: 36px; border-radius: 50%; background: #f1f1f1; display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 14px; font-weight: 600; color: #666; }
  .similar-name { font-size: 13px; font-weight: 600; margin: 0 0 4px; }
  .similar-members { font-size: 12px; color: #888; margin: 0; }
  .similar-open-btn { background: #f1f1f1; color: #2AABEE; font-size: 12px; font-weight: 600; padding: 5px 10px; border-radius: 6px; flex-shrink: 0; }
  .back-link { display: inline-block; font-size: 13px; color: #2AABEE; text-decoration: none; margin-bottom: 16px; }
  .sticky-header .back-link { margin-bottom: 0; }
  .back-link-bottom { margin-top: 24px; margin-bottom: 0; }
  .chart-wrap { position: relative; height: 220px; margin-bottom: 8px; }
  .chart-wrap-small { height: 180px; }
  .chart-note { font-size: 12px; color: #999; margin: 0 0 24px; }
  .chart-toggle { display: flex; gap: 6px; margin-bottom: 10px; }
  .chart-toggle-btn { background: #f1f1f1; border: none; color: #666; font-size: 12px; padding: 5px 12px; border-radius: 6px; cursor: pointer; }
  .chart-toggle-btn.active { background: #2AABEE; color: #fff; }
  .posts-link { display: flex; align-items: center; gap: 14px; border: 1px solid #e5e5e5; border-radius: 10px; padding: 14px 16px; text-decoration: none; color: inherit; margin-bottom: 8px; }
  .posts-link-icon { font-size: 22px; flex-shrink: 0; }
  .posts-link-title { font-size: 14px; font-weight: 600; color: #2AABEE; }
  .posts-link-sub { font-size: 12px; color: #999; }
  .posts-note { font-size: 12px; color: #999; margin: 0 0 24px; }
  .posts-list {
  max-width: 420px;
  margin: 0 auto 8px;
}
  .post-card { display: block; border: 1px solid #e5e5e5; border-radius: 10px; padding: 12px 14px; text-decoration: none; color: inherit; }
  .post-text { font-size: 13px; margin: 0 0 6px; color: #333; }
  .post-meta { font-size: 11px; color: #999; margin: 0; }
  .show-more-btn { display: block; width: 100%; background: #f1f1f1; border: none; color: #2AABEE; font-size: 13px; font-weight: 600; padding: 10px; border-radius: 8px; cursor: pointer; margin-bottom: 12px; }
  .show-more-btn:hover { background: #e8e8e8; }
  .post-hidden { display: none; }
  .milestone-badge { background: #fff4e0; color: #7a5200; font-size: 13px; font-weight: 600; padding: 10px 14px; border-radius: 8px; margin-bottom: 20px; display: inline-block; }
  .poll-widget { margin-bottom: 8px; }
  .poll-buttons { display: flex; gap: 10px; }
  .poll-btn { flex: 1; background: #f1f1f1; border: none; padding: 12px; border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; color: #333; }
  .poll-btn:hover { background: #e8e8e8; }
  .poll-btn.voted { background: #2AABEE; color: #fff; }
  .poll-result { margin-top: 10px; font-size: 13px; color: #666; }
  .poll-bar-row { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
  .poll-bar-track { flex: 1; height: 8px; background: #eee; border-radius: 4px; overflow: hidden; }
  .poll-bar-fill { height: 100%; background: #2AABEE; }
  .poll-bar-fill.down { background: #d64545; }

  /* New: Channel analysis grid */
  .analysis-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 8px; }
  .analysis-item { background: #f7f7f7; border-radius: 8px; padding: 12px 14px; display: flex; flex-direction: column; gap: 4px; }
  .analysis-label { font-size: 12px; color: #666; }
  .analysis-value { font-size: 15px; font-weight: 600; }

  /* New: FAQ accordion */
  .faq-list { display: flex; flex-direction: column; gap: 8px; }
  .faq-item { border: 1px solid #e5e5e5; border-radius: 8px; padding: 12px 14px; }
  .faq-item summary { font-size: 14px; font-weight: 600; cursor: pointer; }
  .faq-item p { font-size: 13px; color: #444; margin: 10px 0 0; }

  /* New: Compare table */
  .compare-table-wrap { overflow-x: auto; margin-bottom: 8px; }
  .compare-table { width: 100%; border-collapse: collapse; font-size: 13px; }
  .compare-table th, .compare-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid #eee; white-space: nowrap; }
  .compare-table th { color: #666; font-weight: 600; font-size: 12px; }
  .compare-row-self { background: #f0f8ff; font-weight: 600; }
  .compare-table a { color: #2AABEE; text-decoration: none; }

  /* New: Range growth badge above the chart */
  .range-growth-badge { display: flex; align-items: baseline; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
  .range-growth-pct { font-size: 22px; font-weight: 700; color: #2e9e5b; }
  .range-growth-diff { font-size: 13px; color: #666; }
  .range-growth-span { font-size: 12px; color: #999; margin-left: auto; }

  /* New: Growth trend narrative */
  .trend-card { background: #f0faf3; border: 1px solid #d3f0dd; border-radius: 10px; padding: 16px; margin-bottom: 24px; }
  .trend-card-title { font-size: 14px; font-weight: 600; margin: 0 0 10px; color: #2e9e5b; }
  .trend-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
  .trend-list li { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; color: #333; line-height: 1.5; }
  .trend-check { color: #2e9e5b; font-weight: 700; flex-shrink: 0; }

  /* New: Compare cards (replaces table) */
  .compare-cards { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 8px; }
  .compare-card { flex: 0 0 160px; border: 1px solid #e5e5e5; border-radius: 10px; padding: 14px; text-decoration: none; color: inherit; }
  .compare-card-self { background: #f0f8ff; border-color: #cce6ff; }
  .compare-card-name { font-size: 13px; font-weight: 600; margin: 0 0 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .compare-card-stats { display: flex; flex-direction: column; gap: 6px; }
  .compare-card-stats div { display: flex; justify-content: space-between; align-items: baseline; }
  .compare-card-value { font-size: 14px; font-weight: 700; }
  .compare-card-label { font-size: 11px; color: #999; }

  /* New: Related guide cards */
  .related-guides { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
  .related-guide-card { display: flex; align-items: center; gap: 10px; border: 1px solid #e5e5e5; border-radius: 10px; padding: 12px 14px; text-decoration: none; color: inherit; }
  .related-guide-card:hover { background: #f7f7f7; }
  .related-guide-icon { font-size: 18px; flex-shrink: 0; }
  .related-guide-title { font-size: 13px; font-weight: 600; flex: 1; }
  .related-guide-arrow { color: #2AABEE; font-weight: 700; }

  /* New: Activity heatmap by weekday */
  .heatmap-row { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-bottom: 8px; }
  .heatmap-cell { border-radius: 8px; padding: 14px 6px; text-align: center; display: flex; flex-direction: column; gap: 4px; }
  .heatmap-day { font-size: 11px; font-weight: 600; opacity: 0.8; }
  .heatmap-count { font-size: 16px; font-weight: 700; }
  .heatmap-cell-best { outline: 2px solid #7c3aed; outline-offset: 2px; position: relative; }
  .heatmap-best-label { font-size: 9px; font-weight: 700; margin-top: 2px; white-space: nowrap; }

  /* Dark mode — toggled by the same /js/theme.js used site-wide, via the
     shared 'dark-mode' class on <body> and localStorage key 'siteTheme'. */
  body.dark-mode { background: #0b1120; color: #d7e6ff; }
  body.dark-mode .crumbs, body.dark-mode .crumbs a { color: #8a97b3; }
  body.dark-mode .back-link { color: #4fc3f7; }
  body.dark-mode h1, body.dark-mode h2, body.dark-mode h3 { color: #eaf1ff; }
  body.dark-mode .avatar { background: #182338; }
  body.dark-mode .tag { background: #182338; color: #b7c4e0; }
  body.dark-mode .subnote, body.dark-mode .chart-note, body.dark-mode .posts-note,
  body.dark-mode .post-meta, body.dark-mode .similar-members, body.dark-mode .stat-label { color: #7c8aa8; }
  body.dark-mode .stat-card, body.dark-mode .pc-card, body.dark-mode .analysis-item {
    background: #131c30;
  }
  body.dark-mode .pc-title, body.dark-mode .about-section h3 { color: #b7c4e0; }
  body.dark-mode p.body { color: #cdd8ee; }
  body.dark-mode .chart-toggle-btn { background: #182338; color: #b7c4e0; }
  body.dark-mode .chart-toggle-btn.active { background: #2AABEE; color: #fff; }
  body.dark-mode .similar-card, body.dark-mode .post-card, body.dark-mode .posts-link {
    background: #131c30; border-color: #223050;
  }
  body.dark-mode .similar-avatar { background: #182338; color: #b7c4e0; }
  body.dark-mode .similar-open-btn { background: #182338; }
  body.dark-mode .post-text { color: #cdd8ee; }
  body.dark-mode .show-more-btn { background: #182338; color: #4fc3f7; }
  body.dark-mode .show-more-btn:hover { background: #223050; }
  body.dark-mode .switch .slider { background-color: #2a3550; }
  body.dark-mode .milestone-badge { background: #2e2410; color: #ffd580; }
  body.dark-mode .poll-btn { background: #182338; color: #cdd8ee; }
  body.dark-mode .poll-btn:hover { background: #223050; }
  body.dark-mode .poll-result { color: #8a97b3; }
  body.dark-mode .poll-bar-track { background: #223050; }
  body.dark-mode .sticky-header { background: #0b1120; box-shadow: 0 2px 6px rgba(0,0,0,0.3); }
  body.dark-mode .faq-item { border-color: #223050; }
  body.dark-mode .faq-item p { color: #cdd8ee; }
  body.dark-mode .analysis-label { color: #8a97b3; }
  body.dark-mode .compare-table th, body.dark-mode .compare-table td { border-color: #223050; }
  body.dark-mode .compare-row-self { background: #14243d; }
  body.dark-mode .related-guide-link { color: #4fc3f7; }
  body.dark-mode .range-growth-diff, body.dark-mode .range-growth-span { color: #8a97b3; }
  body.dark-mode .trend-card { background: #10241a; border-color: #1f4a30; }
  body.dark-mode .trend-list li { color: #cdd8ee; }
  body.dark-mode .compare-card { border-color: #223050; }
  body.dark-mode .compare-card-self { background: #14243d; border-color: #2a5580; }
  body.dark-mode .compare-card-label { color: #7c8aa8; }
  body.dark-mode .related-guide-card { border-color: #223050; }
  body.dark-mode .related-guide-card:hover { background: #131c30; }
  body.dark-mode .related-guide-arrow { color: #4fc3f7; }
  body.dark-mode .section-nav a { background: #182338; color: #b7c4e0; }
  body.dark-mode .section-nav a:hover { background: #223050; }
  .post-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 8px;
}