:root {
    --bg: #f7f7f5; --surface: #ffffff; --text: #1d1d1f; --muted: #5b5b61; --line: #e3e3de;
    --accent: #b3261e; --code: #f0f0ec;
  }
  @media (prefers-color-scheme: dark) {
    :root { --bg: #151516; --surface: #1e1e20; --text: #ececee; --muted: #a4a4ab; --line: #333336; --accent: #ff8a80; --code: #2a2a2d; }
  }
  * { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  body { margin: 0; background: var(--bg); color: var(--text);
         font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
  main { max-width: 780px; margin: 0 auto; padding: 32px 16px 64px; }
  header.page { border-bottom: 3px solid var(--accent); padding-bottom: 16px; margin-bottom: 24px; }
  .brand { font-weight: 700; letter-spacing: .02em; color: var(--accent); text-transform: uppercase; font-size: .85rem; }
  h1 { font-size: 1.9rem; line-height: 1.25; margin: .3em 0 .2em; }
  .updated { color: var(--muted); font-size: .95rem; margin: 0; }
  nav.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 18px; margin: 0 0 28px; }
  nav.toc ol { margin: 0; padding-left: 1.2em; columns: 2 16rem; column-gap: 2rem; }
  nav.toc a { color: inherit; }
  section { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 6px 20px 14px; margin-bottom: 18px; }
  h2 { font-size: 1.2rem; margin: 18px 0 8px; }
  h3 { font-size: 1.02rem; margin: 16px 0 6px; }
  p, li { overflow-wrap: anywhere; }
  ul { padding-left: 1.2em; }
  a { color: var(--accent); }
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  table { border-collapse: collapse; width: 100%; font-size: .95rem; min-width: 520px; }
  th, td { text-align: left; vertical-align: top; border-top: 1px solid var(--line); padding: 8px 10px 8px 0; }
  th { color: var(--muted); font-weight: 600; }
  code { background: var(--code); border-radius: 4px; padding: .05em .35em; font-size: .92em; }
  .en { border-left: 4px solid var(--accent); }
  footer { color: var(--muted); font-size: .9rem; text-align: center; margin-top: 28px; }
  footer a { color: inherit; }
  footer .publisher { font-size: .75rem; }