forgejo/web_src/css/modules/dropdown.css

/* This is an implementation of a dropdown menu based on details HTML tag.
 * It is inspired by https://picocss.com/docs/dropdown.
 *
 * NoJS mode could be improved by forcing the same [name] onto all dropdowns, so
 * that the browser will automatically close all but the one that was just opened
 * using keyboard. But the code doing that will not be as clean.
*/

:root details.dropdown {
  --dropdown-box-shadow: 0 6px 18px var(--color-shadow);
  --dropdown-item-padding: 0.5rem 0.75rem;
}

@media (pointer: coarse) {
  :root details.dropdown {
    --dropdown-item-padding: 0.75rem 1rem;
  }
}

details.dropdown {
  position: relative;
}

details.dropdown > summary {
  /* Optional flex+gap in case summary contains multiple elements */
  display: flex;
  gap: 0.75rem;
  align-items: center;
  /* Cancel some of default styling */
  user-select: none;
  list-style-type: none;
  /* Main visual properties */
  border-radius: var(--border-radius);
  padding: 0.5rem;
}

details.dropdown > summary:hover,
details.dropdown > summary + ul > li:hover {
  background: var(--color-hover);
}

details.dropdown[open] > summary,
details.dropdown > summary + ul > li:focus-within {
  background: var(--color-active);
}

/* NoJS mode. Creates a virtual fullscreen area. Clicking it closes the dropdown. */
.no-js details.dropdown[open] > summary::before {
  z-index: 1;
  position: fixed;
  width: 100vw;
  height: 100vh;
  inset: 0;
  background: 0 0;
  content: "";
  cursor: default;
}

details.dropdown > summary + ul {
  z-index: 99;
  position: absolute;
  min-width: max-content;
  margin: 0;
  margin-top: 0.5rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  list-style-type: none;
  border-radius: var(--border-radius);
  background: var(--color-body);
  box-shadow: var(--dropdown-box-shadow);
  border: 1px solid var(--color-secondary);
}

details.dropdown > summary + ul > li {
  width: 100%;
  background: none;
}

details.dropdown > summary + ul > li:first-child {
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

details.dropdown > summary + ul > li:last-child {
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* dir-auto option - switch the direction at a width point where most of layout changes occur. */
/* There's no way to check with CSS if LTR dropdown will fit on screen without JS. */
@media (max-width: 767.98px) {
  details.dropdown.dir-auto > summary + ul {
    inset-inline: 0 auto;
    direction: rtl;
  }
  details.dropdown.dir-auto > summary + ul > li {
    direction: ltr;
  }
}
/* Note: https://css-tricks.com/css-anchor-positioning-guide/
*  looks like a great thing but FF still doesn't support it. */

/* Note: dropdown.dir-rtl can be implemented when needed, e.g. for navbar profile dropdown on desktop layout. */

details.dropdown > summary + ul > li > .item {
  padding: var(--dropdown-item-padding);
  width: 100%;
  display: flex;
  gap: 0.75rem;
  align-items: center;
  color: var(--color-text);
  /* Suppress underline - hover is indicated by background color */
  text-decoration: none;
}

/* Cancel default styling of button elements */
details.dropdown > summary + ul > li button {
  background: none;
}