.collection-stack {
  display: grid;
  gap: 20px;
}

.download-collection {
  overflow: hidden;
  border: 1px solid rgba(189, 116, 240, 0.32);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.035);
}

.download-collection[open] {
  background: rgba(255, 255, 255, 0.02);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.18);
}

.download-collection summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 30px 34px;
  cursor: pointer;
  list-style: none;
  transition: background 0.2s ease;
}

.download-collection summary::-webkit-details-marker { display: none; }
.download-collection summary:hover { background: rgba(189, 116, 240, 0.08); }
.download-collection summary span { display: grid; gap: 5px; }
.download-collection summary small {
  color: #d99cff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.download-collection summary strong {
  font: 700 clamp(24px, 3vw, 38px)/1.1 Manrope, sans-serif;
  letter-spacing: -0.035em;
}
.download-collection summary em {
  color: var(--muted);
  font-size: 15px;
  font-style: normal;
  line-height: 1.5;
}
.download-collection summary > b {
  display: grid;
  place-items: center;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  color: var(--gold);
  font: 400 28px/1 Manrope, sans-serif;
  transition: transform 0.2s ease, background 0.2s ease;
}
.download-collection[open] summary > b {
  transform: rotate(45deg);
  background: rgba(240, 179, 45, 0.1);
}
.collection-content {
  padding: 4px 20px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.collection-content .featured-product { margin-top: 20px; }
.collection-content .product-grid { margin-top: 20px; }
.letter-icon {
  display: grid;
  place-items: center;
  color: white;
  font: 800 30px/1 Manrope, sans-serif;
}

@media (max-width: 620px) {
  .download-collection { border-radius: 22px; }
  .download-collection summary { padding: 24px 20px; gap: 16px; }
  .download-collection summary em { font-size: 14px; }
  .download-collection summary > b { flex-basis: 38px; width: 38px; height: 38px; }
  .collection-content { padding: 2px 12px 16px; }
}