.doc-stage { padding: 120px 0 72px; }
.doc-head { max-width: 760px; margin: 0 auto; }
.doc-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.doc-head h1 {
  font-size: clamp(28px, 4.2vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
}
.doc-meta {
  color: var(--text-mut);
  font-size: 14px;
  margin-top: 16px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.doc-meta .chip {
  padding: 4px 11px;
  border-radius: 6px;
  background: var(--bg-2);
  border: 1px solid var(--brd);
  font-size: 13px;
}

.doc-grid {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 48px;
  max-width: 1040px;
  margin: 40px auto 0;
  align-items: start;
}
.toc { position: sticky; top: 90px; }
.toc h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.toc a {
  display: block;
  color: var(--text-mut);
  font-size: 13px;
  padding: 6px 0 6px 12px;
  border-left: 2px solid var(--brd);
  transition: 0.15s;
  line-height: 1.35;
}
.toc a:hover { color: var(--text); border-color: var(--brd-2); }
.toc a.active { color: var(--text); border-color: var(--text); }

.prose { max-width: 700px; font-size: 16px; color: var(--text-mut); line-height: 1.72; }
.prose .intro {
  font-size: 17px;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--brd);
  border-left: 2px solid var(--brd-2);
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 8px;
}
.prose h2 {
  color: var(--text);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
  scroll-margin-top: 90px;
}
.prose h2 .n { color: var(--text-dim); margin-right: 8px; font-variant-numeric: tabular-nums; }
.prose p { margin: 12px 0; }
.prose strong { color: var(--text); font-weight: 700; }
.prose ul { list-style: none; margin: 12px 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.prose ul li { position: relative; padding-left: 22px; }
.prose ul li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-dim);
}
.prose a { color: var(--text); font-weight: 600; }
.prose a:hover { text-decoration: underline; }
.prose hr { border: none; border-top: 1px solid var(--brd); margin: 32px 0; }

.related { max-width: 1040px; margin: 52px auto 0; }
.related h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.related-grid { display: flex; gap: 12px; flex-wrap: wrap; }
.rel-card {
  flex: 1;
  min-width: 190px;
  padding: 16px 18px;
  border-radius: 8px;
  background: var(--bg-2);
  border: 1px solid var(--brd);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: 0.15s;
  font-weight: 600;
  font-size: 14px;
}
.rel-card:hover { border-color: var(--brd-2); }
.rel-card .arr { margin-left: auto; color: var(--text-dim); }
.doc-foot {
  max-width: 1040px;
  margin: 40px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--brd);
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 13px;
}
.doc-foot a { color: var(--text-mut); font-weight: 600; }

@media (max-width: 880px) {
  .doc-grid { grid-template-columns: 1fr; gap: 20px; }
  .toc { display: none; }
}