/**
 * @file
 * Accordion item styles.
 */

.ln-accordion-item {
  --ln-accordion-item-fg: #1c1c1c;
  --ln-accordion-item-rule: #ececec;
  --ln-accordion-item-icon-size: 24px;
  --ln-accordion-item-icon-gap: 16px;
  --ln-accordion-item-duration: 0.25s;
  --ln-accordion-item-easing: ease;

  --ln-accordion-item-icon-color: #cf0000;

  padding-bottom: 16px;
  border-bottom: 1px solid var(--ln-accordion-item-rule);
  color: var(--ln-accordion-item-fg);
}

/* Row holding the question and the chevron. */
.ln-accordion-item__summary {
  display: flex;
  align-items: flex-start;
  gap: var(--ln-accordion-item-icon-gap);
  cursor: pointer;
  list-style: none;
}

/* Suppress the native disclosure triangle. */
.ln-accordion-item__summary::-webkit-details-marker {
  display: none;
}

.ln-accordion-item__summary::marker {
  content: '';
}

.ln-accordion-item__summary:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

.ln-accordion-item__question {
  flex: 1 1 0;
  min-width: 0;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.5;
  text-align: left;
}

.ln-accordion-item__icon {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: var(--ln-accordion-item-icon-size);
  height: calc(20px * 1.5);
  color: var(--ln-accordion-item-icon-color);
  transition: transform var(--ln-accordion-item-duration) var(--ln-accordion-item-easing);
}

.ln-accordion-item__icon svg {
  display: block;
  width: 14px;
  height: auto;
}

/* Closed points down, open points up. */
.ln-accordion-item[open] .ln-accordion-item__icon {
  transform: rotate(180deg);
}

/* [open] is still set while the panel closes, so unwind the chevron in step
   with the slide rather than letting it flip at the end. */
.ln-accordion-item[open].ln-accordion-item--closing .ln-accordion-item__icon {
  transform: none;
}

/**
 * Slide the panel open and closed via ::details-content.
 *
 * Rows animate 0fr -> 1fr, not height 0 -> auto: interpolating the auto keyword
 * needs `interpolate-size: allow-keywords`, which is Chromium-only. Browsers
 * without ::details-content just open and close instantly.
 */
.ln-accordion-item::details-content {
  display: grid;
  grid-template-rows: 0fr;
  transition:
    grid-template-rows var(--ln-accordion-item-duration) var(--ln-accordion-item-easing),
    content-visibility var(--ln-accordion-item-duration) allow-discrete;
}

.ln-accordion-item[open]::details-content {
  grid-template-rows: 1fr;
}

/**
 * Set by accordion-item.js while [open] is still present, so the content stays
 * rendered through the closing transition. The extra class is what outranks the
 * [open] rule above.
 *
 * @see accordion-item.js
 */
.ln-accordion-item[open].ln-accordion-item--closing::details-content {
  grid-template-rows: 0fr;
}

/**
 * The animating grid item. It must carry no padding, border or margin: none of
 * those shrink, so any would leave a sliver of panel visible. min-height and
 * overflow are what let the row collapse to 0fr.
 */
.ln-accordion-item__answer {
  min-height: 0;
  overflow: hidden;
}

/* All spacing and typography live inside the clipped area. */
.ln-accordion-item__answer-inner {
  padding-top: 8px;
  font-size: 16px;
  font-weight: 300;
  line-height: 1.5;
}

.ln-accordion-item__answer-inner > :first-child {
  margin-top: 0;
}

.ln-accordion-item__answer-inner > :last-child {
  margin-bottom: 0;
}

/* Zero the duration rather than removing the transitions, so content-visibility
   still resolves discretely and the panel cannot stick mid-state. */
@media (prefers-reduced-motion: reduce) {
  .ln-accordion-item {
    --ln-accordion-item-duration: 0s;
  }
}