.deepdoc-hero {
  position: relative;
  padding-top: clamp(72px, 9vw, 124px);
  padding-bottom: clamp(54px, 7vw, 92px);
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border-soft);
}

.deepdoc-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, transparent, color-mix(in srgb, var(--color-accent) 5%, transparent), transparent),
    repeating-linear-gradient(90deg, transparent 0 87px, color-mix(in srgb, var(--color-text) 3%, transparent) 88px);
  mask-image: linear-gradient(to bottom, var(--color-black), transparent);
}

.deepdoc-heading {
  position: relative;
  z-index: 1;
  text-align: center;
}

.deepdoc-heading h1 {
  margin-top: 20px;
}

.deepdoc-heading .lead {
  margin-right: auto;
  margin-left: auto;
}

.deepdoc-actions {
  justify-content: center;
  margin-top: 28px;
}

.reference-strip {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 56px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-bg-panel);
}

.reference-cell {
  min-width: 0;
  display: grid;
  gap: 5px;
  padding: 23px 25px;
}

.reference-cell + .reference-cell {
  border-left: 1px solid var(--color-border-soft);
}

.reference-cell strong {
  font-size: 16px;
  font-weight: 580;
}

.reference-cell > span:last-child {
  color: var(--color-text-muted);
  font-size: 12px;
}

.guide-relation {
  position: relative;
  z-index: 1;
  margin: 28px auto 0;
  padding: 18px 21px;
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-muted);
  background: var(--color-bg-panel);
  font-size: 14px;
}

.guide-relation a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.deepdoc-ledger {
  padding-top: 38px;
  padding-bottom: var(--section-space);
}

.deepdoc-layout {
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, var(--reading-width));
  justify-content: center;
  gap: clamp(34px, 6vw, 82px);
  margin-top: 50px;
}

.document-index {
  position: sticky;
  top: var(--toc-offset);
  align-self: start;
  min-width: 0;
  padding: 23px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-bg-panel);
}

.document-index > strong {
  display: block;
  margin-top: 12px;
  color: var(--color-text);
  font-size: 18px;
}

.document-index > p {
  margin-top: 10px;
  font-size: 12px;
}

.document-index dl {
  display: grid;
  gap: 0;
  margin: 22px 0 0;
}

.document-index dl div {
  padding: 13px 0;
  border-top: 1px dashed var(--color-border);
}

.document-index dt {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .12em;
}

.document-index dd {
  margin: 4px 0 0;
  color: var(--color-text);
  font-size: 12px;
}

.deepdoc-content {
  min-width: 0;
}

.guide-chapter {
  position: relative;
  padding-top: clamp(62px, 8vw, 104px);
  padding-bottom: clamp(62px, 8vw, 104px);
  border-bottom: 1px solid var(--color-border-soft);
}

.guide-chapter:first-child {
  padding-top: 0;
}

.guide-chapter::before {
  position: absolute;
  top: 0;
  left: -28px;
  width: 1px;
  height: 100%;
  content: "";
  background: repeating-linear-gradient(to bottom, var(--color-border) 0 4px, transparent 4px 11px);
}

.guide-chapter::after {
  position: absolute;
  top: 8px;
  left: -32px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--color-bg);
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-accent);
}

.guide-chapter:first-child::after {
  top: 8px;
}

.chapter-code {
  display: block;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .16em;
}

.guide-chapter h2 {
  margin-bottom: 38px;
}

.guide-chapter h3 {
  margin-top: 38px;
  font-size: clamp(21px, 2.4vw, 27px);
}

.guide-chapter p {
  margin-bottom: 19px;
  font-size: 16px;
  line-height: 1.95;
}

.guide-chapter .network-table-wrap {
  margin: 34px 0 40px;
}

.guide-chapter .network-table {
  min-width: 680px;
}

.decision-sheet {
  margin: 42px 0;
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid color-mix(in srgb, var(--color-paper) 48%, var(--color-border));
  border-radius: var(--radius-large);
  color: var(--color-paper-ink);
  background:
    repeating-linear-gradient(0deg, transparent 0 5px, color-mix(in srgb, var(--color-paper-ink) 4%, transparent) 6px),
    var(--color-paper);
}

.decision-sheet .mono-label {
  color: var(--color-paper-muted);
}

.decision-sheet h3 {
  margin-top: 12px;
  color: var(--color-paper-ink);
}

.decision-sheet ul {
  margin-bottom: 0;
}

.decision-sheet li {
  color: var(--color-paper-ink);
}

.decision-sheet li + li {
  margin-top: 10px;
}

.deepdoc-content > .promo-block {
  margin-top: 76px;
}

.deepdoc-content > .promo-block p {
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .deepdoc-layout {
    grid-template-columns: minmax(0, var(--reading-width));
  }

  .document-index {
    position: static;
    display: none;
  }

  .guide-chapter::before,
  .guide-chapter::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .reference-strip {
    grid-template-columns: 1fr;
  }

  .reference-cell + .reference-cell {
    border-top: 1px solid var(--color-border-soft);
    border-left: 0;
  }

  .deepdoc-ledger {
    padding-top: 24px;
  }

  .deepdoc-layout {
    margin-top: 38px;
  }

  .guide-chapter {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .guide-chapter h2 {
    margin-bottom: 30px;
  }

  .guide-chapter h3 {
    margin-top: 32px;
  }

  .guide-chapter p {
    font-size: 15px;
    line-height: 1.9;
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .reference-strip {
    margin-top: 42px;
  }

  .reference-cell {
    padding: 19px;
  }

  .guide-relation {
    padding: 16px;
  }

  .deepdoc-content > .promo-block {
    margin-top: 58px;
  }
}