html.reading-page {
  height: auto;
  scroll-snap-type: none;
  scroll-padding-top: 2rem;
}

.reading-page body {
  min-width: 0;
  overflow-x: visible;
  overscroll-behavior-y: auto;
}

.reading-header, .reading-shell, .reading-footer {
  width: min(1160px, calc(100% - 4rem));
  margin-inline: auto;
}

.reading-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 2rem;
  border-bottom: 1px solid var(--line);
}

.reading-header nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8rem;
}

.reading-header nav a, .reading-footer a {
  text-decoration: none;
}

.reading-hero {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem) 3rem;
  border-bottom: 1px solid var(--line);
}

.reading-page h1 {
  max-width: 920px;
  margin: 1rem 0 1.5rem;
  color: var(--teal);
  font-family: var(--serif);
  font-size: clamp(2.3rem, 5.5vw, 4.6rem);
  letter-spacing: -0.045em;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.reading-hero .lead {
  max-width: 720px;
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.95;
}

.project-subtitle {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.7em;
  letter-spacing: -0.02em;
}

.reading-meta, .reading-kicker {
  color: #526f77;
  font-size: 0.78rem;
  line-height: 1.8;
}

.reading-kicker {
  letter-spacing: 0.13em;
}

.reading-layout {
  display: grid;
  grid-template-columns: 190px minmax(0, 720px);
  justify-content: space-between;
  gap: 3rem;
  padding-block: 3rem 5rem;
}

.reading-toc {
  align-self: start;
  position: sticky;
  top: 2rem;
  font-size: 0.82rem;
  line-height: 1.8;
  max-height: calc(100svh - 4rem);
  overflow-y: auto;
  scrollbar-width: thin;
  padding: 0.35rem;
}

.reading-toc p {
  color: #526f77;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
}

.reading-toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.reading-toc a {
  display: block;
  padding: 0.35rem 0.6rem;
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.reading-toc a.is-current {
  color: var(--teal);
  background: rgba(26, 67, 78, 0.07);
  border-left-color: var(--teal);
  font-weight: 600;
}

.toc-group { position: relative; min-width: 0; }
.reading-toc .toc-parent { padding-right: 2.4rem; }
.toc-details summary {
  position: absolute;
  top: 0;
  right: 0;
  display: grid;
  place-items: center;
  width: 2.25rem;
  min-height: 2.25rem;
  color: var(--teal);
  cursor: pointer;
  list-style: none;
  border-radius: 0.2rem;
}
.toc-details summary::-webkit-details-marker { display: none; }
.toc-details summary:hover { background: rgba(26,67,78,0.07); }
.toc-details summary span { transition: transform 180ms ease; }
.toc-details[open] summary span { transform: rotate(180deg); }
.reading-toc .toc-sublist {
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 0.35rem;
  margin: 0.65rem 0 0 0.7rem;
  font-size: 0.75rem;
}
.reading-body .module[id] { scroll-margin-top: 2rem; }

.reading-toc a:hover, .reading-header a:hover {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.reading-body {
  min-width: 0;
  font-size: 1rem;
  line-height: 1.95;
  overflow-wrap: anywhere;
}

.reading-body section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 2rem;
}

.reading-body h2 {
  margin: 0 0 1.5rem;
  color: var(--teal);
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  line-height: 1.4;
}

.reading-body h2 span {
  display: block;
  margin-bottom: 0.5rem;
  color: #526f77;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.15em;
}

.reading-body h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--teal);
  margin: 0 0 1rem;
}

.reading-body p { margin: 0 0 1.2rem; }
.reading-body ul, .reading-body ol { padding-left: 1.3rem; }
.reading-body li { margin-block: 0.55rem; }
.reading-body a { text-underline-offset: 0.25em; }

.module, .case, .record, .progress-item {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.module dl { margin: 0; }
.module dt { color: var(--teal); font-weight: 600; font-size: 0.88rem; }
.module dd { margin: 0 0 1rem; }
.module dd:last-child { margin-bottom: 0; }

.note {
  padding: 1.2rem 1.4rem;
  border-left: 2px solid var(--teal);
  background: rgba(255,255,255,0.6);
}

.reading-body .note p:last-child { margin-bottom: 0; }
.badge { display: inline-block; padding: 0.15rem 0.65rem; border: 1px solid var(--line); border-radius: 2rem; font-size: 0.72rem; color: var(--teal); margin-bottom: 0.8rem; }
.reading-body .record h3 { margin-bottom: 0.6rem; }
.reading-body .record p { margin-bottom: 0.8rem; }
.record-link { display: inline-block; padding-block: 0.4rem; }

.flow { list-style: none; padding: 0 !important; margin-block: 1.5rem; }
.flow li { padding: 1rem 1.2rem; background: rgba(255,255,255,0.6); border: 1px solid var(--line); }
.flow li + li::before { content: '↓'; display: block; color: #526f77; margin-bottom: 0.5rem; }
.flow strong { display: block; color: var(--teal); }
.flow small { display: block; font-size: 0.85rem; }

.reading-body code { font-size: 0.9em; overflow-wrap: anywhere; }
.reading-body pre { white-space: pre-wrap; overflow-wrap: anywhere; padding: 1.2rem; border: 1px solid var(--line); font-size: 0.85rem; line-height: 1.8; }
.reading-footer { padding-block: 2rem 3rem; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; font-size: 0.82rem; line-height: 1.8; overflow-wrap: anywhere; }

@media (max-width: 820px) {
  .reading-header, .reading-shell, .reading-footer { width: calc(100% - 2.5rem); }
  .reading-layout { grid-template-columns: minmax(0,1fr); gap: 2.5rem; padding-block: 2rem 3rem; }
  .reading-toc { position: static; max-height: none; overflow: visible; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); }
  .reading-toc ol { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0.5rem 1rem; }
  .reading-toc .toc-group { grid-column: 1 / -1; }
  .reading-toc .toc-sublist { grid-template-columns: repeat(2,minmax(0,1fr)); }
  html.reading-page { scroll-behavior: auto; }
}

@media (max-width: 480px) {
  .reading-header, .reading-shell, .reading-footer { width: calc(100% - 2rem); }
  .reading-header { padding-block: 1.3rem; }
  .reading-header nav { gap: 1rem; font-size: 0.75rem; }
  .reading-hero { padding-block: 3rem 2rem; }
  .reading-body { font-size: 0.95rem; }
  .note { padding: 1rem; }
}