:root {
  --bg: #ffffff;
  --text: #1c2430;
  --muted: #5b6573;
  --accent: #0a84c6;
  --line: #e3e7ec;
  --note-bg: #f3f8fc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1118;
    --text: #e6ebf1;
    --muted: #9aa5b3;
    --accent: #4fb8f0;
    --line: #233040;
    --note-bg: #111c27;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; padding-top: 12px; border-top: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 20px 0 6px; }
p, li { color: var(--text); }
.meta { color: var(--muted); margin: 0 0 24px; }
a { color: var(--accent); }
nav { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 0 0 24px; font-size: .95rem; }
.note { background: var(--note-bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
table { width: 100%; border-collapse: collapse; margin: 8px 0; font-size: .95rem; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }