:root {
  --paper: #f7f3ec;
  --ink: #221f1a;
  --ink-soft: #5c554b;
  --rule: #ded5c6;
  --accent: #8a5a35;
  --card: #fffdf9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16150f;
    --ink: #ece6da;
    --ink-soft: #a49b8b;
    --rule: #322e26;
    --accent: #c99263;
    --card: #1d1b15;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif CJK SC", "Songti SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
}

.masthead, main, footer { max-width: 44rem; margin: 0 auto; }

.masthead {
  padding: 5rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.eyebrow {
  margin: 0 0 1.25rem;
  font: 500 0.72rem/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 9vw, 4rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.lede {
  margin: 1.5rem 0 0;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

main { padding-top: 2.5rem; }

.card {
  position: relative;
  padding: 1.6rem 1.6rem 1.4rem;
  margin-bottom: 1.25rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 3px;
}

.num {
  position: absolute;
  top: 1.35rem;
  right: 1.5rem;
  font: 500 0.7rem/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0.16em;
  color: var(--accent);
  opacity: 0.75;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.card p { margin: 0 0 0.9rem; }
.card p:last-child, .card ul:last-child, .card ol:last-child, .card dl:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 0.9rem; padding-left: 1.35rem; }
li { margin-bottom: 0.35rem; }
li::marker { color: var(--accent); }

dl {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.35rem 1rem;
  margin: 0.2rem 0 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--rule);
  font-size: 0.96rem;
}

dl.wide { grid-template-columns: 8.5rem 1fr; }

dt { color: var(--ink-soft); font: 500 0.82rem/1.7 ui-sans-serif, system-ui, sans-serif; letter-spacing: 0.04em; }
dd { margin: 0; }

.aside {
  padding-left: 0.9rem;
  border-left: 2px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.94rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.85rem;
}

footer p { margin: 0 0 0.3rem; }
.muted { font: 400 0.78rem/1.6 ui-sans-serif, system-ui, sans-serif; letter-spacing: 0.06em; }

a { color: var(--accent); }

@media (max-width: 30rem) {
  .masthead { padding-top: 3.25rem; }
  .card { padding: 1.3rem 1.15rem 1.1rem; }
  .num { top: 1.15rem; right: 1.1rem; }
  dl, dl.wide { grid-template-columns: 1fr; gap: 0.1rem; }
  dl dt { margin-top: 0.5rem; }
}

/* 404 */
body.error-page { display: flex; min-height: 100vh; align-items: center; justify-content: center; padding: 2rem; }
.error-box { max-width: 26rem; text-align: center; }
.error-box h1 { font-size: 3rem; margin: 0 0 0.5rem; }
.error-box p { color: var(--ink-soft); }