/* CrossAIHub — Progressive disclosure component
   بند 191 (2026-09-01), /learn/ IA Phase 2.
   Used on /learn/advanced/* to (a) surface a gentle prerequisite note on
   the track index, collapsed by default, and (b) collapse the existing
   "Related reading" supplementary block on each of the 5 advanced lessons
   so the primary teaching is read first and deeper/optional material is
   revealed on demand. Zero content removed -- everything already on the
   page stays, just progressively disclosed via native <details>. */
.lk-disclosure {
  margin: 1.75rem 0;
  border: 1px solid var(--lk-gold-soft, #E8C87A);
  border-radius: 10px;
  background: var(--lk-ivory-soft, #FFFAEE);
  padding: 0;
  overflow: hidden;
}
.lk-disclosure > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.9rem 1.2rem;
  font-weight: 600;
  color: var(--lk-navy, #3A4A6C);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.lk-disclosure > summary::-webkit-details-marker { display: none; }
.lk-disclosure > summary::after {
  content: "+";
  font-size: 1.2rem;
  line-height: 1;
  color: var(--lk-gold-warm, #B58628);
  flex-shrink: 0;
}
.lk-disclosure[open] > summary::after { content: "\2212"; }
.lk-disclosure > summary:hover { background: var(--lk-parchment, #F5E7C8); }
.lk-disclosure__body {
  padding: 0 1.2rem 1.1rem;
  border-top: 1px solid var(--lk-gold-soft, #E8C87A);
  padding-top: 1rem;
}
.lk-disclosure__body p { margin: 0 0 0.75rem; }
.lk-disclosure__body p:last-child { margin-bottom: 0; }