/* Collapsible site presentation; approved Opus construction content is retained. */
.section.prep-section { padding-top: 0; padding-bottom: 12px; }
.prep-intro { padding-top: 28px; margin-bottom: 24px; }
.prep-intro p { color: var(--muted); max-width: 65ch; }
.prep-controls { display: flex; flex-wrap: wrap; gap: 10px; }
.prep-disclosure { border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.prep-disclosure > summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 20px 24px; cursor: pointer; list-style: none; }
.prep-disclosure > summary::-webkit-details-marker { display: none; }
.prep-disclosure > summary:hover { background: var(--tint); border-radius: var(--radius); }
.prep-disclosure > summary h2 { margin: 0; font-size: clamp(1.05rem, 1rem + .5vw, 1.35rem); line-height: 1.35; }
.prep-toggle { width: 22px; height: 22px; flex: none; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; }
.prep-disclosure[open] > summary .prep-toggle { transform: rotate(45deg); }
.prep-disclosure[open] > summary { border-bottom: 1px solid var(--line); }
.prep-content { padding: 24px; min-width: 0; }
.prep-content > :last-child { margin-bottom: 0; }
.prep-content .section { padding-top: 20px; padding-bottom: 20px; }
.prep-section .enclosure-order { margin-top: 12px; margin-bottom: 18px; }
@media (max-width: 600px) {
  .prep-disclosure > summary { padding: 18px 16px; }
  .prep-content { padding: 20px 16px; }
}
@media print {
  .prep-controls, .prep-toggle { display: none !important; }
  .prep-disclosure { border: 0; }
  .prep-disclosure > summary, .prep-content { padding: 0; }
  .prep-disclosure > summary { margin-bottom: 16px; }
}