:root {
  --chapter-paper: #fffdfa;
  --chapter-paper-soft: #fff8f0;
  --chapter-border: rgba(104, 91, 71, 0.16);
  --chapter-shadow: 0 20px 42px rgba(55, 63, 48, 0.08);
}

.chapter-page {
  background:
    radial-gradient(circle at top left, rgba(53, 111, 102, 0.14), transparent 28%),
    radial-gradient(circle at bottom right, rgba(198, 144, 77, 0.12), transparent 22%),
    linear-gradient(180deg, #faf6ef 0%, #f5efe5 100%);
}

.chapter-page .ui-kicker--accent {
  color: #274f49;
}

.chapter-shell {
  max-width: var(--width);
  margin: 0 auto;
  padding: 1.2rem 1.5rem 4rem;
}

.chapter-hero {
  margin-top: 0.7rem;
}

.chapter-hero__panel {
  padding: 0 1.7rem 1.7rem;
  background:
    linear-gradient(180deg, rgba(255, 252, 247, 0.96), rgba(251, 247, 240, 0.92)),
    rgba(255, 255, 255, 0.86);
}

.chapter-hero h1 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.06;
  color: var(--brand-dark);
}

.chapter-hero__lead {
  max-width: 40em;
  margin-top: 1rem;
  font-size: 1.04rem;
  color: var(--muted);
}

.chapter-meta {
  margin: 1rem 0 0;
}

.chapter-layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 1.35rem;
  margin-top: 1.2rem;
  align-items: start;
}

.chapter-sidebar .sticky-card {
  position: sticky;
  top: 5.8rem;
}

.chapter-side-group + .chapter-side-group {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(71, 85, 105, 0.12);
}

.chapter-side-stack {
  display: grid;
  gap: 0.8rem;
}

.chapter-side-link[aria-current="page"] {
  background: rgba(224, 237, 232, 0.98);
  border-color: rgba(53, 111, 102, 0.28);
}

.chapter-side-link[aria-current="page"] h3,
.chapter-side-link[aria-current="page"] p {
  color: var(--brand-dark);
}

.chapter-reading {
  min-width: 0;
}

.chapter-block {
  border: 1px solid var(--chapter-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--chapter-shadow);
}

.chapter-block + .chapter-block {
  margin-top: 1.2rem;
}

.chapter-block--intro {
  padding: 1.5rem 1.6rem;
  background: linear-gradient(180deg, rgba(255, 255, 253, 0.98), rgba(255, 250, 242, 0.95));
}

.chapter-block--text {
  padding: 1.8rem 1.9rem;
  background: linear-gradient(180deg, rgba(255, 253, 250, 0.99), rgba(255, 248, 240, 0.96));
}

.chapter-block--intro > *,
.chapter-block--text > * {
  max-width: 70ch;
}

.chapter-block h2,
.chapter-block h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-title);
  color: var(--brand-dark);
}

.chapter-block--intro p {
  font-family: "Source Serif 4", var(--font-body);
  font-size: 1.04rem;
  line-height: 1.85;
  color: #3b3932;
}

.chapter-block--intro p + p {
  margin-top: 0.95rem;
}

.chapter-epigraph {
  margin: 0.8rem 0 1.35rem;
  font-family: "Source Serif 4", var(--font-body);
  font-size: 1.1rem;
  line-height: 1.8;
  color: #4b5d56;
}

.chapter-block p,
.chapter-block li {
  color: var(--muted);
}

.chapter-block--text p,
.chapter-block--text li {
  font-family: "Source Serif 4", var(--font-body);
  font-size: 1.08rem;
  line-height: 1.95;
  color: #2d2b25;
}

.chapter-block--text p + p {
  margin-top: 1rem;
}

.chapter-block--text h2 {
  margin-top: 2.4rem;
  padding-top: 1.35rem;
  border-top: 1px solid rgba(104, 91, 71, 0.14);
  font-size: clamp(1.45rem, 2.3vw, 1.9rem);
}

.chapter-block--text h2:first-of-type {
  margin-top: 0.25rem;
  padding-top: 0;
  border-top: 0;
}

.chapter-block--text h3 {
  margin-top: 1.45rem;
  font-size: 1.14rem;
  letter-spacing: 0.01em;
}

@media (max-width: 1040px) {
  .chapter-layout {
    grid-template-columns: 1fr;
  }

  .chapter-sidebar .sticky-card {
    position: static;
  }
}

@media (max-width: 720px) {
  .chapter-shell {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .chapter-hero__panel,
  .chapter-block--intro,
  .chapter-block--text {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }
}