.expandable {
  margin: 1.25rem 0;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 0.1rem 1rem;
}
.expandable summary {
  cursor: pointer;
  padding: 0.75rem 0;
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}
.expandable summary::-webkit-details-marker { display: none; }
.expandable summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.5em;
  color: #8B87FF;
  transition: transform 0.15s ease;
}
.expandable[open] summary::before { transform: rotate(90deg); }
.expandable summary:focus-visible {
  outline: 2px solid #8B87FF;
  outline-offset: 2px;
}
.expandable__content {
  padding: 0 0 1rem;
}
.expandable__content > :first-child { margin-top: 0; }