core/misc/dialog/off-canvas/css/details.pcss.css
/**
 * @file
 * Visual styling for summary and details in the off-canvas dialog.
 *
 * @internal
 */

#drupal-off-canvas-wrapper {
  --off-canvas-details-border-width: 0;
  --off-canvas-details-border-color: none;
  --off-canvas-details-background-color: #474747;
  --off-canvas-details-text-color: #ddd;
  --off-canvas-details-summary-border: none;
  --off-canvas-details-summary-padding: 10px 20px;
  --off-canvas-details-summary-font-size: 14px;
  --off-canvas-details-summary-background-color: #333;
  --off-canvas-details-summary-background-color-hover: #222;
  --off-canvas-details-summary-text-color: #eee;
  --off-canvas-details-summary-text-color-hover: #fff;

  & details {
    margin: var(--off-canvas-vertical-spacing-unit) calc(-1 * var(--off-canvas-padding)); /* Cancel out the padding of the parent. */
    padding: 0 var(--off-canvas-padding);
    color: var(--off-canvas-details-text-color);
    border: solid var(--off-canvas-details-border-color) var(--off-canvas-details-border-width);
    background: var(--off-canvas-details-background-color);

    & + details {
      margin-top: calc(-1 * var(--off-canvas-details-border-width));
    }
  }

  & summary {
    margin: 0 calc(-1 * var(--off-canvas-padding));
    padding: var(--off-canvas-details-summary-padding);
    color: var(--off-canvas-details-summary-text-color);
    border: var(--off-canvas-details-summary-border);
    background-color: var(--off-canvas-details-summary-background-color);
    font-size: var(--off-canvas-details-summary-font-size);

    &:hover {
      color: var(--off-canvas-details-summary-text-color-hover);
      background-color: var(--off-canvas-details-summary-background-color-hover);
    }

    &:focus {
      outline-offset: -4px; /* Ensure focus doesn't get cut off. */
    }

    & a {
      color: var(--off-canvas-details-text-color);

      &:hover {
        color: var(--off-canvas-details-summary-text-color-hover);
      }
    }
  }

  & .details-wrapper {
    padding: var(--off-canvas-vertical-spacing-unit) 0;
  }
}
