core/themes/claro/css/components/dropbutton.pcss.css
/**
 * @file
 * Dropbutton styles.
 *
 * 1. Transparent border is needed for high contrast mode. The border-width has
 *    to be set with !important to render borders with the defined width in high
 *    contrast mode Firefox.
 */

:root {
  /**
  * Dropbutton
  */
  --dropbutton-spacing-size: var(--space-m);
  --dropbutton-font-size: var(--font-size-base);
  --dropbutton-line-height: var(--space-m);
  --dropbutton-toggle-size: 3rem;
  --dropbutton-border-size: 1px;
  --dropbutton-toggle-size-spacing: var(--dropbutton-border-size);
  --dropbutton-border-radius-size: 2px;
  --dropbutton-item-max-width: 12.5rem;
  /* Variant variables: small. */
  --dropbutton-small-spacing-size: 0.625rem;
  --dropbutton-small-font-size: var(--font-size-xs);
  --dropbutton-small-line-height: 0.75rem;
  --dropbutton-small-toggle-size: calc((2 * var(--dropbutton-small-spacing-size)) + var(--dropbutton-small-line-height));
  /* Variant variables: extra small. */
  --dropbutton-extrasmall-spacing-size: 0.375rem;
  --dropbutton-extrasmall-font-size: var(--font-size-xs);
  --dropbutton-extrasmall-line-height: 0.75rem;
  --dropbutton-extrasmall-toggle-size: calc((2 * var(--dropbutton-extrasmall-spacing-size)) + var(--dropbutton-extrasmall-line-height));
}

.dropbutton-wrapper {
  display: inline-flex;
  border-radius: var(--button-border-radius-size);
  box-shadow: 0 1px 2px rgb(0, 0, 0, 0.25);
}

.form-actions .dropbutton-wrapper,
.field-actions .dropbutton-wrapper {
  margin-block: var(--space-xs);
  margin-inline: 0 var(--space-m);
}

.dropbutton-widget {
  position: relative;
  flex: 1 1 auto;
  .js .dropbutton-wrapper.open & {
    z-index: var(--dropbutton-widget-z-index);
  }
}

/**
 * Dropbutton list.
 */
.dropbutton {
  display: block;
  overflow: visible;
  min-width: 6rem; /* Help mitigate long dropbutton text from obscuring other dropbuttons. */
  height: var(--dropbutton-toggle-size);
  margin: 0;
  list-style: none;
}

.dropbutton-widget {
  border-radius: var(--button-border-radius-size);
  background-color: var(--button-bg-color);
}

/* Variants. */
.dropbutton--small {
  height: var(--dropbutton-small-toggle-size);
}

.dropbutton--extrasmall {
  height: var(--dropbutton-extrasmall-toggle-size);
}

/**
 * First dropbutton list item.
 */
.dropbutton--multiple .dropbutton__item:first-of-type {
  margin-right: calc(var(--dropbutton-toggle-size) + var(--dropbutton-toggle-size-spacing)); /* LTR */
  white-space: nowrap;
  [dir="rtl"] & {
    margin-right: 0;
    margin-left: calc(var(--dropbutton-toggle-size) + var(--dropbutton-toggle-size-spacing));
  }
}

/* First dropbutton list item variants */
.no-touchevents .dropbutton--multiple.dropbutton--small .dropbutton__item:first-of-type {
  margin-right: calc(var(--dropbutton-small-toggle-size) + var(--dropbutton-toggle-size-spacing)); /* LTR */
  white-space: nowrap;
  [dir="rtl"] & {
    margin-right: 0;
    margin-left: calc(var(--dropbutton-small-toggle-size) + var(--dropbutton-toggle-size-spacing));
  }
}

.no-touchevents .dropbutton--multiple.dropbutton--extrasmall .dropbutton__item:first-of-type {
  margin-right: calc(var(--dropbutton-extrasmall-toggle-size) + var(--dropbutton-toggle-size-spacing)); /* LTR */
  white-space: nowrap;
  [dir="rtl"] & {
    margin-right: 0;
    margin-left: calc(var(--dropbutton-extrasmall-toggle-size) + var(--dropbutton-toggle-size-spacing));
  }
}

/**
 * Dropbutton toggler.
 */
.dropbutton__toggle {
  position: absolute;
  z-index: 3;
  top: 0;
  right: 0; /* LTR */
  bottom: 0;
  width: var(--dropbutton-toggle-size);
  height: var(--dropbutton-toggle-size);
  border: var(--dropbutton-border-size) solid transparent !important; /* 1 */
  border-inline-start: var(--dropbutton-border-size) solid white !important;
  border-radius: 0 var(--button-border-radius-size) var(--button-border-radius-size) 0; /* LTR */
  background: var(--button-bg-color);
  font-size: 1px; /* iOS Safari sets a minimum button-width based on font-size. */
  appearance: none;
  [dir="rtl"] & {
    right: auto;
    left: 0;
    border-radius: var(--button-border-radius-size) 0 0 var(--button-border-radius-size);
  }
  &::before {
    position: absolute;
    top: 50%;
    right: 50%;
    width: 0.875rem;
    height: 0.5625rem;
    content: "";
    transform: translate(50%, -50%) rotate(0);
    background: url(../../images/icons/000f33/chevron-down.svg) no-repeat center;
    background-size: contain;
  }

  /* Toggler states. */
  &:hover {
    color: var(--button-fg-color);
    background-color: var(--button--hover-bg-color);
    box-shadow: 0 2px 4px rgb(0, 0, 0, 0.25);
  }
  &:focus {
    z-index: 2;
  }
  &:active {
    color: var(--button-fg-color);
    background-color: var(--button--active-bg-color);
  }
}

.dropbutton-wrapper.open .dropbutton__toggle::before {
  transform: translate(50%, -50%) rotate(180deg);
  [dir="rtl"] & {
    transform: translate(50%, -50%) rotate(-180deg);
  }
}

/* Toggler variants */
.no-touchevents .dropbutton--small .dropbutton__toggle {
  width: var(--dropbutton-small-toggle-size);
  height: var(--dropbutton-small-toggle-size);
}

.no-touchevents .dropbutton--extrasmall .dropbutton__toggle {
  width: var(--dropbutton-extrasmall-toggle-size);
  height: var(--dropbutton-extrasmall-toggle-size);
}

.no-touchevents .dropbutton--small .dropbutton__toggle::before,
.no-touchevents .dropbutton--extrasmall .dropbutton__toggle::before {
  width: 0.75rem; /* 12px */
}

/* High contrast. */
@media (forced-colors: active) {
  /* Default. */
  .dropbutton__toggle::before {
    width: 0.5625rem;
    height: 0.5625rem;
    margin-top: calc(0.5625rem / (2 * -1.41429));
    transform: translate(50%, -50%) rotate(135deg); /* LTR */
    border-width: 0.125rem 0.125rem 0 0;
    border-style: solid;
    background: none;
    .dropbutton-wrapper.open & {
      margin-top: calc(0.5625rem / (2 * 1.41429));
      transform: translate(50%, -50%) rotate(315deg);
    }
    [dir="rtl"] .dropbutton-wrapper.open & {
      transform: translate(50%, -50%) rotate(-45deg);
    }
  }

  /* Variants */

  .no-touchevents .dropbutton--small .dropbutton__toggle::before,
  .no-touchevents .dropbutton--extrasmall .dropbutton__toggle::before {
    width: 0.4375rem;
    height: 0.4375rem;
    margin-top: calc(0.4375rem / (2 * -1.41429));
  }

  .dropbutton-wrapper.open .dropbutton__toggle::before {
    margin-top: calc(0.4375rem / (2 * 1.41429));
  }
}

/**
 * Item in the first dropbutton list item (that looks like a button).
 *
 * Duplicates base button styles.
 */
.dropbutton__item:first-of-type {
  & > * {
    display: inline-block;
    margin: 0;
    padding: calc(var(--dropbutton-spacing-size) - var(--dropbutton-border-size)) calc(var(--space-l) - var(--dropbutton-border-size));
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    color: var(--button-fg-color);
    border: var(--dropbutton-border-size) solid transparent !important; /* 1 */
    border-radius: var(--button-border-radius-size);
    background-color: var(--button-bg-color);
    font-size: var(--dropbutton-font-size);
    font-weight: 700;
    line-height: var(--dropbutton-line-height);
    appearance: none;
    -webkit-font-smoothing: antialiased;
  }

  .dropbutton--multiple & > * {
    padding-inline: calc(var(--dropbutton-spacing-size) - var(--dropbutton-border-size));
  }

  /* Variants */
  .no-touchevents .dropbutton--small & > * {
    padding-block: calc(var(--dropbutton-small-spacing-size) - var(--dropbutton-border-size));
    font-size: var(--dropbutton-small-font-size);
    line-height: var(--dropbutton-small-line-height);
  }

  .no-touchevents .dropbutton--extrasmall & > * {
    padding-top: calc(var(--dropbutton-extrasmall-spacing-size) - var(--dropbutton-border-size));
    padding-bottom: calc(var(--dropbutton-extrasmall-spacing-size) - var(--dropbutton-border-size));
    font-size: var(--dropbutton-extrasmall-font-size);
    line-height: var(--dropbutton-extrasmall-line-height);
  }

  & > *:hover,
  & > .button:hover {
    text-decoration: none;
    color: var(--button-fg-color);
    background-color: var(--button--hover-bg-color);
    box-shadow: 0 2px 4px rgb(0, 0, 0, 0.25);
  }

  & > *:focus:hover,
  & > .button:focus:hover {
    box-shadow:
      0 0 0 2px var(--color-white),
      0 0 0 5px var(--color-focus);
  }

  & > *:focus {
    text-decoration: none;
  }

  & > *:active {
    color: var(--button-fg-color);
    background-color: var(--button--active-bg-color);
  }

  .dropbutton--multiple & > * {
    position: relative;
    z-index: 3;
  }

  .dropbutton--multiple & > *:focus {
    z-index: 2;
  }

  .dropbutton--multiple & > * {
    border-radius: var(--button-border-radius-size) 0 0 var(--button-border-radius-size); /* LTR */
  }
  [dir="rtl"] .dropbutton--multiple & > * {
    border-radius: 0 var(--button-border-radius-size) var(--button-border-radius-size) 0;
  }
}

.dropbutton > .dropbutton__item > a,
.dropbutton > .dropbutton__item > .button {
  display: block;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  text-align: left; /* LTR */
}
[dir="rtl"] .dropbutton > .dropbutton__item > a,
[dir="rtl"] .dropbutton > .dropbutton__item > .button {
  text-align: right;
}

.dropbutton-wrapper:not(.open) .dropbutton__item:first-of-type ~ .dropbutton__item {
  visibility: hidden;
  /**
  * By setting a height of 1px, the dropbutton items are hidden
  * from view while still occupying minimal space, ensuring the layout remains intact.
  */
  height: 1px;
}

/**
 * Non-first dropbutton list elements.
 */
.dropbutton__item:first-of-type ~ .dropbutton__item {
  border: var(--dropbutton-border-size) solid var(--color-gray-200);
  border-bottom: 0;
  box-shadow: 0 2px 10px rgb(0, 0, 0, 0.15);
  & ~ .dropbutton__item {
    border-top: 0;
  }
}

.dropbutton__item ~ .dropbutton__item:last-child {
  border-bottom: var(--dropbutton-border-size) solid var(--color-gray-200);
  border-radius: 0 0 var(--dropbutton-border-radius-size) var(--dropbutton-border-radius-size);
}

/**
 * Dropbutton items of non-first dropbutton list elements.
 */
.dropbutton__item:first-of-type ~ .dropbutton__item {
  max-width: var(--dropbutton-item-max-width);
}

.dropbutton__item:first-of-type ~ .dropbutton__item > a,
.dropbutton__item:first-of-type ~ .dropbutton__item > .button {
  position: relative;
  padding: calc(var(--dropbutton-spacing-size) - var(--dropbutton-border-size));
  white-space: normal;
  text-decoration: none;
  color: var(--color-gray-800);
  border: var(--dropbutton-border-size) solid transparent !important; /* 1 */
  border-radius: var(--dropbutton-border-radius-size);
  background: var(--color-white);
  box-shadow: none;
  font-size: var(--dropbutton-font-size);
  font-weight: normal;
  line-height: var(--dropbutton-line-height);
  -webkit-font-smoothing: antialiased;
}

.dropbutton__item:first-of-type ~ .dropbutton__item > a:not(:focus),
.dropbutton__item:first-of-type ~ .dropbutton__item > .button:not(:focus) {
  z-index: 1;
}

/* Variants. */
.no-touchevents .dropbutton--small .dropbutton__item:first-of-type ~ .dropbutton__item > a,
.no-touchevents .dropbutton--small .dropbutton__item:first-of-type ~ .dropbutton__item > .button {
  padding-top: var(--dropbutton-small-spacing-size);
  padding-bottom: var(--dropbutton-small-spacing-size);
  font-size: var(--dropbutton-small-font-size);
  line-height: var(--dropbutton-small-line-height);
}

.no-touchevents .dropbutton--extrasmall .dropbutton__item:first-of-type ~ .dropbutton__item > a,
.no-touchevents .dropbutton--extrasmall .dropbutton__item:first-of-type ~ .dropbutton__item > .button {
  padding-top: var(--dropbutton-extrasmall-spacing-size);
  padding-bottom: var(--dropbutton-extrasmall-spacing-size);
  font-size: var(--dropbutton-extrasmall-font-size);
  line-height: var(--dropbutton-extrasmall-line-height);
}

/* States. */
.dropbutton__item {
  & > *:focus {
    position: relative;
    z-index: 3;
  }

  &:first-of-type ~ & > *:hover {
    color: var(--color-text);
    background: var(--color-gray-050);
  }

  & > .button:not(:focus) {
    box-shadow: none;
  }

  &:first-of-type ~ & > *:focus {
    border-color: var(--color-focus) !important; /* 1 */
    box-shadow:
      inset 0 0 0 1px var(--color-focus),
      0 0 0 1px var(--color-focus);
  }
}
