:root {
  --bg: #fbfaf7;
  --fg: #1f1d1a;
  --muted: #6b665e;
  --card: #ffffff;
  --border: #ded9cf;
  --accent: #2f5d8a;
  --accent-fg: #ffffff;
  --ok: #2d6a3e;
  --warn: #9a5b00;
  --bad: #a1272a;
  --quote-bg: #f3f0e8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17161a;
    --fg: #e9e6df;
    --muted: #a09b91;
    --card: #1f1e23;
    --border: #36343b;
    --accent: #7fb0e0;
    --accent-fg: #101114;
    --ok: #7fcf93;
    --warn: #e0b060;
    --bad: #f0868a;
    --quote-bg: #26252b;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1rem 1rem 4rem;
}
.notice {
  margin: 4rem 0;
  text-align: center;
  color: var(--muted);
}
header.top {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  margin-bottom: 1rem;
}
header.top h1 {
  font-size: 1.1rem;
  margin: 0;
}
header.top p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}
progress {
  width: 100%;
  height: 0.5rem;
  margin-top: 0.4rem;
  accent-color: var(--accent);
}
h2.chapter {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-bottom: 1rem;
}
.card.done {
  border-left: 4px solid var(--ok);
}
.card h3 {
  font-size: 1rem;
  margin: 0;
}
.card h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 1rem 0 0.25rem;
}
.heading {
  font-weight: 600;
  margin: 0.25rem 0 0;
}
.text p {
  font: 1.05rem/1.65 Charter, "Iowan Old Style", Georgia, "Times New Roman", serif;
  margin: 0 0 0.75rem;
}
.muted {
  color: var(--muted);
}
.quote {
  background: var(--quote-bg);
  border-radius: 0.35rem;
  padding: 0.5rem 0.75rem;
  margin: 0.5rem 0;
  font-size: 0.95rem;
}
.quote .ref {
  font-weight: 600;
}
.quote p {
  margin: 0.25rem 0 0;
  font-family: Charter, "Iowan Old Style", Georgia, serif;
}
.quote .tag {
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: 0.8rem;
  margin-right: 0.35rem;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
button {
  font: inherit;
  min-height: 2.75rem;
  padding: 0 1.1rem;
  border-radius: 0.4rem;
  border: 1px solid var(--accent);
  background: var(--card);
  color: var(--accent);
  cursor: pointer;
}
button.primary {
  background: var(--accent);
  color: var(--accent-fg);
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
form.decide {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.6rem;
}
form.decide label {
  display: block;
}
form.decide textarea {
  width: 100%;
  min-height: 6rem;
  font: inherit;
  padding: 0.5rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
}
fieldset {
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.5rem 0.75rem;
  margin: 0;
}
.error {
  color: var(--bad);
  margin: 0.5rem 0 0;
}
.reveal {
  margin-top: 1rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border);
  font-size: 0.95rem;
}
.reveal ul {
  margin: 0.25rem 0;
  padding-left: 1.2rem;
}
.pass {
  color: var(--ok);
}
.warn {
  color: var(--warn);
}
.fail {
  color: var(--bad);
}
.recorded {
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
}
.recorded li {
  margin: 0.25rem 0;
}