:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1d1f23;
  --muted: #5d6470;
  --line: #e6e2da;
  --brand: #e2572b;
  --brand-ink: #b23f19;
  --todo-bg: #fff3b0;
  --todo-text: #5a4700;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1d2024;
    --text: #e9e7e3;
    --muted: #a3a9b3;
    --line: #2e3238;
    --brand: #ff7a4d;
    --brand-ink: #ff9a77;
    --todo-bg: #4a3f00;
    --todo-text: #ffe680;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px 20px; padding-top: 14px; padding-bottom: 14px;
}
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.logo span { color: var(--brand); }
nav a {
  color: var(--muted); text-decoration: none; margin-right: 16px; font-size: .95rem;
}
nav a:last-child { margin-right: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--brand-ink); }
.wrap { max-width: 780px; margin: 0 auto; padding: 0 16px; }
main { padding: 32px 0 56px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 6px; }
.meta { color: var(--muted); font-size: .92rem; margin: 0 0 28px; }
h2 {
  font-size: 1.2rem; margin: 36px 0 8px; padding-top: 12px;
  border-top: 1px solid var(--line);
}
h3 { font-size: 1.02rem; margin: 22px 0 6px; }
a { color: var(--brand-ink); }
ul, ol { padding-left: 1.3em; }
li { margin: 4px 0; }
.toc {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 20px; margin-bottom: 8px;
}
.toc ol { margin: 6px 0 0; columns: 2; column-gap: 28px; }
@media (max-width: 560px) { .toc ol { columns: 1; } }
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; padding: 16px 20px; margin: 16px 0;
}
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.cards a.card { display: block; text-decoration: none; color: var(--text); margin: 0; }
.cards a.card:hover { border-color: var(--brand); }
.cards a.card strong { display: block; color: var(--brand-ink); margin-bottom: 4px; }
table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: .95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }
mark.todo {
  background: var(--todo-bg); color: var(--todo-text);
  padding: 0 4px; border-radius: 3px;
}
footer.site {
  border-top: 1px solid var(--line); color: var(--muted);
  font-size: .88rem; padding: 20px 0 32px;
}
footer.site a { color: var(--muted); }