/* Feature-detail composition. Shared tokens and primitives remain in style.css. */

#governed-turn,
.feature-chapter {
  scroll-margin-block-start: calc(var(--nav-h) + 24px);
}

.turn-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 32px;
  padding: 0;
  border-block: 1px solid var(--line);
  background: var(--line);
  list-style: none;
}

.turn-flow > li {
  min-width: 0;
  padding: 20px;
  background: var(--bg);
}

.turn-num {
  display: block;
  color: var(--accent);
  font-family: var(--f-mono);
  font-size: 12px;
}

.turn-flow [data-turn-step="approval"] .turn-num { color: var(--warn); }
.turn-flow [data-turn-step="trace"] .turn-num { color: var(--good); }

.turn-flow h3 {
  margin: 8px 0 6px;
  font-family: var(--f-display);
  font-size: 17px;
}

.turn-flow p {
  margin: 0;
  color: var(--ink-2);
  font-size: 14px;
}

.capability-shell {
  border-block-start: 1px solid var(--line);
}

.capability-layout {
  display: grid;
  grid-template-columns: 144px minmax(0, 1fr);
  align-items: start;
  gap: 48px;
}

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

.chapter-nav {
  position: sticky;
  inset-block-start: calc(var(--nav-h) + 24px);
  display: grid;
  align-self: start;
  padding-block: 24px;
}

.chapter-nav a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 10px;
  border-inline-start: 2px solid var(--line);
  color: var(--ink-2);
  font-family: var(--f-mono);
  font-size: 12px;
}

.chapter-nav a:hover,
.chapter-nav a:focus-visible {
  border-inline-start-color: var(--accent);
  color: var(--ink);
  text-decoration: none;
}

.feature-chapter {
  min-width: 0;
  padding: 72px 0;
}

.feature-chapter:first-child { border-block-start: 0; }

.chapter-head {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  margin-bottom: 32px;
}

.chapter-head > * { min-width: 0; }

.chapter-head h2,
.boundary-note h2 {
  margin: 0;
  font-family: var(--f-display);
  font-size: 32px;
  line-height: 1.14;
}

.chapter-head p {
  max-width: 46rem;
  margin: 8px 0 0;
  color: var(--ink-2);
}

.chapter-proof {
  display: grid;
  gap: 24px;
}

.proof-copy { max-width: 48rem; }

.proof-copy h3,
.evidence-band h3,
.detail-card h3 {
  margin: 9px 0 6px;
  font-family: var(--f-display);
  font-size: 18px;
}

.proof-copy p,
.evidence-band p,
.detail-card p {
  margin: 0;
  color: var(--ink-2);
}

.proof-copy ul {
  margin: 14px 0 0;
  padding-inline-start: 20px;
  color: var(--ink-2);
}

.proof-copy li { margin: 5px 0; }
.proof-copy li::marker { color: var(--accent); }

.evidence-band,
.detail-grid {
  display: grid;
  gap: 1px;
  border-block: 1px solid var(--line);
  background: var(--line);
}

.evidence-band { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.evidence-band > div,
.detail-card {
  min-width: 0;
  padding: 22px;
  background: var(--bg);
}

.detail-card p + p { margin-top: 10px; }

.shot-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 20px;
}

.product-evidence { margin: 0; }
.product-shot { margin-bottom: 24px; }
.chapter-wide-media { margin-top: 32px; }

.product-evidence .frame-bar .u { margin-inline-start: 0; }

.frame img.theme-shot,
.frame .theme-shot-fallback img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  background: var(--panel-2);
  object-fit: contain;
}

.frame .theme-shot-fallback,
.frame noscript {
  display: block;
}

.theme-shot-viewport { min-width: 0; }

.theme-shot-viewport.mobile-pan:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.mobile-shot-hint { display: none; }

.frame-caption {
  padding: 10px 12px;
  border-block-start: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 13px;
}

.boundary-note {
  margin-block: 72px;
  padding: 32px 24px;
  border-block: 1px solid var(--risk);
  background: var(--bg-2);
}

.boundary-note > .tag { color: var(--risk); }

.boundary-note p {
  max-width: 48rem;
  margin: 10px 0 0;
  color: var(--ink-2);
}

.boundary-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

@media (max-width: 900px) {
  .turn-flow { grid-template-columns: minmax(0, 1fr); }

  .turn-flow > li {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 16px;
  }

  .turn-num { padding-top: 2px; }
  .capability-layout { display: block; }

  .chapter-nav {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding-block: 16px;
    border-block-end: 1px solid var(--line);
  }
}

@media (max-width: 760px) {

  .evidence-band,
  .detail-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 600px) {
  #governed-turn { padding-block-start: 32px; }
  .chapter-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-chapter { padding: 52px 0; }

  .chapter-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .chapter-head h2,
  .boundary-note h2 {
    font-size: 28px;
  }

  .turn-flow > li {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .theme-shot-viewport.mobile-pan {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }

  .theme-shot-viewport.mobile-pan .theme-shot,
  .theme-shot-viewport.mobile-pan .theme-shot-fallback img {
    width: 640px;
    max-width: none;
  }

  .mobile-shot-hint {
    display: block;
    margin-top: 4px;
    color: var(--ink-3);
    font-family: var(--f-mono);
    font-size: 11px;
  }

  .boundary-note {
    margin-block: 52px;
    padding: 24px 20px;
  }
}

@media (max-width: 420px) {
  .boundary-actions .btn { width: 100%; }
}

@media (min-width: 901px) and (max-height: 700px) {
  .chapter-nav { position: static; }
}