:root {
  --bg: #f7f8fa;
  --fg: #1c2230;
  --muted: #566176;
  --accent: #0b7fa3;
  --rule: #dfe3ea;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070d1c;
    --fg: #dbe3f0;
    --muted: #8d9ab0;
    --accent: #4fd1f0;
    --rule: #1d2840;
    --card: #0c1428;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 46rem; margin: 0 auto; padding: 2.5rem 1rem 4rem; }
header { margin-bottom: 2rem; }
.brand { font-weight: 700; letter-spacing: 0.35em; color: var(--accent); text-decoration: none; font-size: 0.85rem; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0.6rem 0 0.25rem; }
h2 { font-size: 1.2rem; margin: 2.2rem 0 0.5rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
h3 { font-size: 1rem; margin: 1.4rem 0 0.3rem; }
p, li { margin: 0.4rem 0; }
ul { padding-left: 1.3rem; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 0.9rem; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 1rem 1.2rem; margin: 1.2rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 0.8rem 0; }
th, td { text-align: left; vertical-align: top; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--rule); }
th { color: var(--muted); font-weight: 600; }
.table-wrap { overflow-x: auto; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: 0.9rem; }
footer a { margin-right: 1rem; }