themes/olivero/css/components/dropbutton.pcss.css
/**
 * @file
 * Dropbutton styles.
 */

.dropbutton-wrapper {
  --dropbutton--height: var(--sp1-5);
  --dropbutton--secondary-bg-color: var(--color--white);
  --dropbutton--active-bg-color: var(--color--gray-90);
  --dropbutton--outline-color: var(--color--primary-40); /* Minimum 3:1 contrast ratio against --dropbutton--active-bg-color and --dropbutton--secondary-bg-color. */
  --dropbutton--border-radius: var(--border-radius);
  --dropbutton--font-size: var(--font-size-s);
  --dropbutton--text-color: var(--color-text-neutral-medium); /* Minimum 4.5:1 contrast ratio against --dropbutton--active-bg-color and --dropbutton--secondary-bg-color. */
  --dropbutton--text-hover-color: var(--color-text-primary-medium); /* Minimum 4.5:1 contrast ratio against --dropbutton--active-bg-color and --dropbutton--secondary-bg-color. */

  &.open {
    position: relative;
    z-index: 100; /* Ensure this appears above all other dropbuttons. */
    filter: drop-shadow(0 2px 2px var(--dropbutton--active-bg-color));
  }
}

.dropbutton-widget {
  position: relative;
  width: max-content;
  height: var(--dropbutton--height);
  padding-inline-end: var(--dropbutton--height);
  border-radius: var(--dropbutton--border-radius);

  .dropbutton-single & {
    padding-inline-end: 0;
  }

  .dropbutton-wrapper.open & {
    border-radius: var(--dropbutton--border-radius) var(--dropbutton--border-radius) 0 0;
  }
}

.dropbutton {
  height: var(--dropbutton--height);
  margin-block: 0;
  margin-inline-start: 0;
  padding-inline-start: 0;
  list-style: none;
  font-size: var(--dropbutton--font-size);
}

/* This is the button that expands/collapses the secondary options. */
.dropbutton-toggle button {
  position: absolute;
  top: 0;
  inset-inline-end: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--dropbutton--height);
  height: var(--dropbutton--height);
  padding: 0;
  cursor: pointer;
  border-color: transparent;
  border-radius: 0 var(--border-radius) var(--border-radius) 0; /* LTR */
  background: var(--dropbutton--active-bg-color);

  &:focus {
    outline: solid 2px var(--dropbutton--outline-color);
    outline-offset: -2px;
  }

  &:dir(rtl) {
    border-radius: var(--dropbutton--border-radius) 0 0 var(--dropbutton--border-radius);
  }

  &::before {
    display: block;
    width: var(--sp0-5);
    height: var(--sp0-5);
    content: "";
    transform: translateY(-25%) rotate(45deg);
    border-right: solid 2px var(--dropbutton--outline-color);
    border-bottom: solid 2px var(--dropbutton--outline-color);
  }

  .dropbutton-wrapper.open & {
    &::before {
      transform: translateY(25%) rotate(225deg);
    }
  }
}

/* This is the first <li> element in the list of actions. */
.dropbutton-action {
  &:first-child {
    margin-inline-end: 2px;
    border: solid 1px transparent;
    border-radius: var(--dropbutton--border-radius) 0 0 var(--dropbutton--border-radius); /* LTR */
    background: var(--dropbutton--active-bg-color);

    &:dir(rtl) {
      border: solid 1px transparent;
      border-radius: 0 var(--dropbutton--border-radius) var(--dropbutton--border-radius) 0;
    }
  }

  & a {
    display: flex;
    align-items: center;
    margin-bottom: -2px; /* Account for borders. */
    padding: 0 9px;
    text-decoration: none;
    color: var(--dropbutton--text-color);
    font-weight: 600;

    &:hover {
      color: inherit;
    }

    &:focus {
      outline: solid 2px var(--dropbutton--outline-color);
      outline-offset: -1px; /* Overlap parent container by 1px. */
    }
  }

  /* Special rules if there is only one action. */
  .dropbutton-single & {
    &:first-child {
      border-right: solid 1px transparent; /* LTR */
      border-radius: var(--dropbutton--border-radius);

      &:dir(rtl) {
        border: solid 1px transparent;
      }
    }

    & a {
      justify-content: center;
    }
  }
}

/* These are the <li> elements other than the first. */
.secondary-action {
  visibility: hidden;
  width: calc(100% + var(--dropbutton--height));
  border-right: 1px solid var(--dropbutton--active-bg-color);
  border-left: 1px solid var(--dropbutton--active-bg-color);
  background: var(--dropbutton--secondary-bg-color);

  &:last-child {
    border-bottom: 1px solid var(--dropbutton--active-bg-color);
  }

  & a:hover {
    color: var(--dropbutton--text-hover-color);
  }

  .dropbutton-wrapper.open & {
    visibility: visible;
  }
}
