.control-panel { display: flex; flex-direction: column; }
.control-list { display: grid; gap: 20px; margin-top: 12px; }
.control-group { display: grid; min-width: 0; gap: 7px; }
.control-group label, .control-group__heading, .control-label { display: block; color: var(--color-text); font-size: 0.8125rem; font-weight: 500; }
.control-group__heading { margin-bottom: 8px; }
.control-group select, .control-group input { width: 100%; min-width: 0; min-height: 44px; border: 1px solid var(--color-input-line); border-radius: 0; background: var(--color-input); color: var(--color-text); padding: 0 10px; font-size: 0.8125rem; }
.control-group input[type="range"] { min-height: 44px; border: 0; padding: 0; accent-color: var(--color-accent); }
.control-group input[type="checkbox"] { width: 24px; min-height: 24px; accent-color: var(--color-accent); }
.range-control { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px; }
.range-control output { min-width: 44px; color: var(--color-text-muted); font-size: 0.75rem; text-align: right; font-variant-numeric: tabular-nums; }
.control-error { color: var(--color-error); font-size: 0.75rem; }
.item-control-list { display: grid; gap: 8px; }
.item-control { display: grid; grid-template-columns: 1fr minmax(72px, 1fr); align-items: center; gap: 8px; color: var(--color-text-muted); font-size: 0.75rem; }
.control-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; }
.reset-button { min-width: 44px; font-size: 0.75rem; }
.control-section > summary { display: flex; min-height: 44px; align-items: center; justify-content: space-between; gap: 8px; cursor: pointer; font-size: 0.8125rem; font-weight: 500; list-style: none; }
.control-section > summary::-webkit-details-marker { display: none; }
.control-section > summary::after { content: "+"; color: var(--color-text-muted); }
.control-section[open] > summary::after { content: "−"; }
.control-section__body { display: grid; gap: 16px; padding: 12px 0 4px; }
.lesson-presets { margin-top: 12px; }
.lesson-presets__actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.playground-preset { background: var(--color-input); font-size: 0.75rem; padding-inline: 10px; }
.save-status { margin-top: 12px; color: var(--color-text-muted); font-size: 0.75rem; }
@media (max-width: 820px) {
  .control-list, .control-section__body { gap: 6px; }
  .control-group { grid-template-columns: 108px minmax(0, 1fr); align-items: center; gap: 4px 10px; }
  .control-group select, .control-group input { font-size: 1rem; }
  .control-group--wide, .control-group--items { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .control-error { grid-column: 1 / -1; }
  .control-section__body { padding-top: 6px; }
  .item-control-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 16px; }
  .item-control { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .control-group__heading { margin-bottom: 0; }
  .lesson-presets__actions { gap: 6px; }
  .control-actions > .complete-button, .control-actions > #practice-check { width: 100%; }
}
@media (max-width: 350px) {
  .control-group { grid-template-columns: 100px minmax(0, 1fr); gap: 4px 8px; }
  .control-group--wide, .control-group--items { grid-template-columns: minmax(0, 1fr); }
}