$border: 1px solid gray;

*,
.context,
.ad.hoc {
  // The outermost dropdown container, holding together the label (if any),
  // and the select element with arrow. Note, that the dropdown option list,
  // when opened, exists completely outside the dropdown DOM hierarchy, and
  // is aligned into the correct position by JS.
  &.container {
    align-items: center;
    display: inline-flex;
    margin: 0.1em;
    position: relative;
  }

  // Styling of default label next to the dropdown (has no effect on custom
  // non-string label node, if provided).
  &.label {
    margin: 0 0.6em 0 1.2em;
  }

  &.dropdown {
    border: $border;
    border-radius: 0.3em;
    cursor: pointer;
    min-width: 200px;
    outline: none;
    padding: 0.3em 3.0em 0.3em 0.6em;
    position: relative;
    user-select: none;

    &:focus {
      border-color: blue;
      box-shadow: 0 0 3px 1px lightblue;
    }
  }

  &.option {
    cursor: pointer;
    outline: none ;
    padding: 0 0.6em;

    &:focus {
      background: royalblue;
      color: white;
    }

    &:hover {
      background: royalblue;
      color: white;
    }
  }

  &.select {
    background: white;
    border: $border;
    border-radius: 0 0 0.3em 0.3em;
    border-top: none;
    box-shadow: 0 6px 12px 3px lightgray;
    position: fixed;
    z-index: 1001;
  }

  &.arrow {
    background-image: linear-gradient(to top, lightgray, white 50%, white);
    border-left: $border;
    border-radius: 0 0.3em 0.3em 0;
    bottom: 0;
    padding: 0.3em 0.6em;
    position: absolute;
    right: 0;
    top: 0;

    &::after {
      content: '▼';
    }
  }

  &.active {
    .arrow {
      border-radius: 0 0.3em 0 0;
    }

    .dropdown {
      border-color: blue;
      border-radius: 0.3em 0.3em 0 0;
    }
  }

  &.upward {
    &.active {
      // NOTE: Here StyleLint complains about order & specifity of selectors in
      // the compiled CSS, but it should have no effect on the actual styling.
      // stylelint-disable no-descending-specificity
      .arrow {
        border-radius: 0 0 0.3em;
      }

      .dropdown {
        border-radius: 0 0 0.3em 0.3em;
      }
      // stylelint-enable no-descending-specificity
    }

    &.select {
      border-bottom: none;
      border-top: $border;
      border-radius: 0.3em 0.3em 0 0;

      // NOTE: Here a normal (downward) shadow would weirdly cast over
      // the dropdown element, and other ways to cast the shadow result in
      // "upward" shadow, which is also weird. Thus, better no shadow at all
      // for the upward-opened dropdown.
      box-shadow: none;
    }
  }
}