:root {
    --fg: #000; --muted: #666; --faint: #8a8a8a; --line: #eaeaea; --wash: #fafafa;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", Menlo, monospace;
    color-scheme: light;
  }
  * { box-sizing: border-box; }
  body { margin: 0; color: var(--fg); background: #fff; font: 17px/1.65 var(--sans);
         -webkit-font-smoothing: antialiased; }
  .wrap { max-width: 720px; margin: 0 auto; padding: 0 22px; }
  a { color: #000; }
  header { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: #fff;
           z-index: 10; }
  header .wrap { display: flex; justify-content: space-between; align-items: center;
                 padding: 16px 22px; }
  header b { font-size: 16px; }
  header nav a { color: var(--muted); text-decoration: none; font-size: 15px; margin-left: 18px; }
  header nav a:hover { color: var(--fg); }
  h1 { font-size: 38px; line-height: 1.15; letter-spacing: -.03em; margin: 48px 0 16px;
       font-weight: 600; }
  h2 { font-size: 22px; letter-spacing: -.02em; margin: 38px 0 12px; font-weight: 600; }
  p { margin: 0 0 16px; color: #333; }
  ul { padding-left: 20px; margin: 0 0 16px; }
  li { margin-bottom: 8px; color: #333; }
  .box { background: var(--wash); border: 1px solid var(--line); border-radius: 10px;
         padding: 18px 20px; margin: 24px 0; }
  .box strong { display: block; margin-bottom: 6px; font-size: 16px; }
  footer { border-top: 1px solid var(--line); margin-top: 60px; padding: 32px 0;
           font-size: 14px; color: var(--muted); }

.inl1 { text-decoration: none; }
.inl2 { color: var(--muted); font-size: 15px; }