:root {
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --accent: #2563eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
    --bg: #0f172a;
    --accent: #60a5fa;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 32px 20px 72px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 44rem; margin: 0 auto; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 34px 0 10px; }
.effective { color: var(--muted); font-size: 0.9rem; margin: 0 0 28px; }
p, li { color: var(--ink); }
strong { font-weight: 650; }
a { color: var(--accent); }
ul { padding-left: 1.2rem; }
li { margin-bottom: 6px; }
.callout {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, transparent);
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
}
/* Wide tables must scroll inside themselves, never the page. */
.table-wrap { overflow-x: auto; margin: 18px 0; }
table { border-collapse: collapse; width: 100%; min-width: 34rem; font-size: 0.92rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 650; }
footer { margin-top: 48px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.88rem; }
footer a { margin-right: 14px; }