:root {
  color-scheme: light;
  --ink: #18212b;
  --muted: #5b6773;
  --line: #d9e0e7;
  --surface: #ffffff;
  --soft: #f4f7fa;
  --accent: #245b8f;
  --warn: #8a5b00;
  --warn-bg: #fff7df;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.page { max-width: 980px; margin: 0 auto; padding: 32px 20px 64px; }
header { background: var(--surface); border: 1px solid var(--line); padding: 28px 32px; }
h1 { margin: 0 0 8px; font-size: clamp(1.8rem, 4vw, 2.5rem); line-height: 1.2; }
h2 { margin: 36px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--line); font-size: 1.35rem; }
h3 { margin: 24px 0 8px; font-size: 1.08rem; }
p { margin: 10px 0; }
nav { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }
nav a { color: var(--accent); }
.meta { color: var(--muted); font-size: .95rem; }
.notice { margin: 20px 0; padding: 14px 16px; border-left: 4px solid #d49b22; background: var(--warn-bg); color: var(--warn); }
.section { background: var(--surface); border: 1px solid var(--line); padding: 24px 28px; margin-top: 18px; }
table { width: 100%; border-collapse: collapse; margin: 14px 0 20px; font-size: .95rem; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: #e9eff5; font-weight: 650; }
tr:nth-child(even) td { background: #fbfcfd; }
code { background: #edf2f6; padding: 2px 5px; border-radius: 3px; }
a { color: var(--accent); }
footer { color: var(--muted); margin-top: 24px; font-size: .9rem; }
@media (max-width: 680px) {
  .page { padding: 12px 10px 40px; }
  header, .section { padding: 18px 16px; }
  table { display: block; overflow-x: auto; white-space: normal; }
  th, td { min-width: 150px; }
}