:root {
  --bg: #f6f0e4;
  --ink: #2a1818;
  --muted: #6b5348;
  --dim: #8a7368;
  --line: #d4c4aa;
  --maroon: #7a2e2e;
  --rule: #c4a574;
  --card: #fffaf0;
  --good: #2d5a3a;
  --bad: #8b1e1e;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --mono: "American Typewriter", "Courier New", "SFMono-Regular", ui-monospace, Menlo, monospace;
  --page: min(44rem, calc(100vw - 2.4rem));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      rgba(122, 46, 46, 0.035) 27px,
      rgba(122, 46, 46, 0.035) 28px
    ),
    var(--bg);
  font: 16.5px/1.75 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--maroon); text-underline-offset: 0.18em; }
a:hover { color: var(--ink); }
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--maroon);
  outline-offset: 3px;
}
code, .cite { font-family: var(--mono); font-size: 0.92em; }

.skip {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--maroon);
  color: var(--card);
  transform: translateY(-160%);
}
.skip:focus { transform: none; }

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 10px 4vw 12px;
  background: color-mix(in srgb, var(--bg) 90%, white);
  border-bottom: 2px solid var(--maroon);
}
.brand {
  font: 700 15px/1 var(--serif);
  color: var(--maroon);
  text-decoration: none;
}
.brand:hover { color: var(--ink); }
.sits {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 4px;
  flex: 1;
}
.sits a {
  padding: 4px 8px;
  color: var(--muted);
  text-decoration: none;
  font: 700 12px/1.3 var(--mono);
}
.sits a:hover,
.sits a.is-here { color: var(--maroon); }
.sits a.is-here { box-shadow: inset 0 -2px 0 var(--maroon); }
.out {
  display: flex;
  gap: 14px;
  margin-left: auto;
  font-size: 13px;
}
.out a { color: var(--muted); text-decoration: none; }
.out a:hover { color: var(--ink); }

main { width: var(--page); margin: 0 auto; padding: 2.8rem 0 4.5rem; }

.kicker {
  margin: 0 0 10px;
  color: var(--maroon);
  font: 700 11px/1.4 var(--mono);
  letter-spacing: 0.14em;
}
h1 {
  margin: 0 0 16px;
  font: 700 clamp(28px, 5vw, 42px)/1.22 var(--serif);
  letter-spacing: -0.02em;
}
h2 {
  margin: 2.2rem 0 0.7rem;
  font: 700 1.35rem/1.35 var(--serif);
  color: var(--maroon);
}
h3 {
  margin: 1.4rem 0 0.45rem;
  font: 700 1.05rem/1.4 var(--serif);
}
.lede { margin: 0 0 1.2rem; color: var(--muted); font-size: 17px; }
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1.1rem; padding-left: 1.2rem; }
li + li { margin-top: 0.45rem; }

.hero { margin-bottom: 2.2rem; }
.hero-links { display: flex; flex-wrap: wrap; gap: 14px 22px; margin-top: 1.2rem; }

.cards { display: grid; gap: 12px; margin: 1.6rem 0 2.4rem; }
.card {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 4px 14px;
  padding: 16px 18px 18px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--maroon);
  text-decoration: none;
  color: inherit;
  box-shadow: 3px 3px 0 rgba(122, 46, 46, 0.08);
}
.card:hover { border-color: var(--maroon); }
.card .n {
  font: 700 12px/1 var(--mono);
  color: var(--maroon);
  letter-spacing: 0.08em;
}
.card b { font: 700 18px/1.3 var(--serif); }
.card span { color: var(--muted); font-size: 14px; line-height: 1.55; }

.drawer {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.2rem 1.25rem;
  margin: 1.2rem 0 1.6rem;
  box-shadow: 4px 4px 0 rgba(42, 24, 24, 0.04);
}
.drawer h2 { margin-top: 0; }
.ledger {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin: 0.8rem 0 1.1rem;
}
.ledger th, .ledger td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 0.45rem 0.5rem 0.45rem 0;
  vertical-align: top;
}
.ledger th { color: var(--muted); font-weight: 600; font-size: 13px; }
.cite-block {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.65;
  background: #f3ead6;
  border-left: 3px solid var(--maroon);
  padding: 0.8rem 1rem;
  margin: 0.9rem 0 1.1rem;
}

.work {
  margin: 1.6rem 0 2rem;
  padding: 1.15rem 1.2rem 1.3rem;
  background: var(--card);
  border: 1px solid var(--maroon);
}
.work h2 { margin-top: 0; }
.work .hint { color: var(--muted); font-size: 14px; }

.q {
  margin: 0 0 1.2rem;
  padding: 0.9rem 1rem;
  border: 1px dashed var(--rule);
}
.q p { margin: 0 0 0.6rem; }
.q .who { font-family: var(--mono); font-size: 13px; color: var(--maroon); }

.choices { display: grid; gap: 8px; margin: 8px 0; }
.choices button,
.ops button,
button {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--maroon);
  background: var(--maroon);
  color: var(--card);
  cursor: pointer;
}
.choices button, .ops button, button.ghost {
  background: var(--card);
  color: var(--ink);
  border-color: var(--rule);
  text-align: left;
}
.choices button:hover, .ops button:hover, button.ghost:hover {
  border-color: var(--maroon);
}
.choices button[aria-pressed="true"],
.ops button[aria-pressed="true"] {
  border-color: var(--maroon);
  box-shadow: inset 3px 0 0 var(--maroon);
}
.choices button.is-right { border-color: var(--good); box-shadow: inset 3px 0 0 var(--good); }
.choices button.is-wrong { border-color: var(--bad); box-shadow: inset 3px 0 0 var(--bad); }

.outbox { min-height: 1.5em; margin: 0.55rem 0 0; font-size: 15px; }
.outbox.ok { color: var(--good); }
.outbox.bad { color: var(--bad); }

.ops { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.seq {
  min-height: 2.4rem;
  margin: 8px 0 4px;
  padding: 8px 10px;
  border: 1px dashed var(--maroon);
  font-family: var(--mono);
  font-size: 14px;
  background: #f3ead6;
}
.sentences button {
  display: block;
  width: 100%;
  margin: 0 0 8px;
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--rule);
  text-align: left;
  padding: 10px 12px;
}
.sentences button .tag {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}
.sentences button.is-mark { border-color: var(--bad); background: #f8e8e4; }

details {
  margin: 1rem 0;
  border: 1px dashed var(--rule);
  padding: 0.6rem 0.85rem;
  background: color-mix(in srgb, var(--card) 70%, transparent);
}
details summary { cursor: pointer; color: var(--maroon); font-weight: 600; }

.foot {
  width: var(--page);
  margin: 0 auto;
  padding: 1.2rem 0 2.4rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
  font-family: var(--mono);
}
.foot a { color: var(--muted); }
.foot a:hover { color: var(--ink); }

@media (max-width: 720px) {
  .top { position: static; }
  .sits { order: 3; width: 100%; }
  .card { grid-template-columns: 1fr; }
}