discourse/app/assets/stylesheets/common/select-kit/select-kit.scss

.select-kit {
  @include unselectable;
  border: none;
  box-sizing: border-box;
  display: inline-block;
  flex-direction: column;
  position: relative;
  vertical-align: middle;

  &.is-hidden {
    display: none !important;
  }

  > summary {
    list-style-type: none;
    display: block;

    &:before {
      content: none !important;
      margin: 0;
    }
  }

  > summary::marker {
    display: none !important;
  }

  &.is-disabled {
    pointer-events: none;
  }

  &.is-expanded {
    z-index: z("dropdown");

    .select-kit-body {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border-radius: 0;
      border: none;
      border: 1px solid var(--primary-low);
      box-shadow: var(--shadow-dropdown);
      background: var(--secondary);
      max-width: 600px;
    }

    .select-kit-collection {
      box-sizing: border-box;
      width: 100%;
    }

    .select-kit-filter.is-expanded {
      padding: 0.25em 0.5em;
    }
  }

  &.is-loading {
    .select-kit-collection {
      overflow: hidden;
    }
  }

  .d-icon {
    color: var(--primary-high);
  }

  .select-kit-header {
    @include form-item-sizing;
    font-weight: 500;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    align-items: stretch;
    height: 100%;
    &:not(.btn) {
      border-radius: var(--d-input-border-radius);
      padding-left: 0.5em;
      padding-right: 0.5em;
    }

    /* hide native indicator */
    &::-webkit-details-marker {
      display: none;
    }

    .select-kit-header-wrapper {
      box-sizing: border-box;
      display: flex;
      align-items: center;
      width: 100%;
    }

    .d-icon-spinner {
      -webkit-animation: rotate-forever 1s infinite linear;
      animation: rotate-forever 1s infinite linear;
    }

    .selected-name {
      text-align: left;
      flex: 0 1 auto;
      align-items: center;
      color: inherit;
      display: flex;
      outline: none;

      &:focus .d-icon-times {
        color: var(--danger);
      }

      .d-icon + .name {
        margin-left: 0.5em;
      }

      .name {
        display: inline-flex;
        gap: 0.5em;
        > .d-icon {
          margin-left: 0.5em;
          margin-right: 0;
        }
      }

      > .d-icon {
        margin-right: 0;
      }

      &.select-kit-selected-color {
        border-bottom-width: 5px;
        border-bottom-style: solid;
      }
    }

    .btn-clear {
      margin-left: 0.25em;
      padding: 0.25em;
      border: 0;
      background: none;
      min-height: auto;
    }

    .icon {
      margin-right: 5px;
    }

    .caret-icon {
      margin-left: auto;
      margin-right: 0;
      padding-left: 5px;
      pointer-events: none;
      color: inherit;
    }

    .d-button-label {
      display: flex;
      align-items: center;
      white-space: nowrap;
      overflow: hidden;
      line-height: var(--line-height-medium);

      .d-icon {
        margin-left: 5px;
        margin-right: 0;
      }
    }
  }

  .select-kit-body {
    display: none;
    background: var(--secondary);
    box-sizing: border-box;

    .selected-content {
      max-height: 300px;
      overflow-y: auto;
    }

    &[data-popper-reference-hidden] {
      html:not(.ios-device) & {
        visibility: hidden;
        pointer-events: none;
      }
    }
  }

  .select-kit-row {
    cursor: pointer;
    outline: none;
    display: flex;
    flex: 1 0 auto;
    box-sizing: border-box;
    align-items: center;
    justify-content: flex-start;
    padding: 0.5em;

    > * {
      pointer-events: none;
    }

    .name {
      margin: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      flex: 1 1 0%;
    }

    .d-icon + .name,
    .svg-icon-title + .name {
      margin-left: 0.5em;
    }

    &.is-highlighted {
      background: var(--d-hover);
    }

    &.is-selected {
      background: var(--d-selected);
    }

    &.is-selected.is-highlighted {
      background: var(--d-hover);
    }

    .discourse-tag,
    .discourse-tag:visited,
    .discourse-tag:hover {
      color: var(--primary-high);
    }

    &.create-color-row {
      border-left-style: solid;
      border-left-width: 5px;
    }
  }

  .select-kit-collection {
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0;
    max-height: 250px;
    width: 100%;

    &:hover .select-kit-row.is-highlighted:hover {
      background: var(--d-hover);
    }

    .validation-message {
      white-space: nowrap;
      color: var(--danger);
      flex: 1 0 auto;
      margin: 5px;
      padding: 0 2px;
    }

    &::-webkit-scrollbar {
      -webkit-appearance: none;
      width: 10px;
    }

    &::-webkit-scrollbar-thumb {
      cursor: pointer;
      border-radius: 5px;
      background: var(--primary-med-or-secondary-med);
    }

    &::-webkit-scrollbar-track {
      background: transparent;
      border-radius: 0;
    }
  }

  .select-kit-filter {
    box-sizing: border-box;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    position: relative;

    .filter-input {
      background: none;
      margin: 0;
      padding: 0;
      flex: 1 0 0px;
      outline: none;
      border: 0;
      border-radius: 0;
      box-shadow: none;
      width: 100%;
      box-sizing: border-box;
      min-height: 30px;
    }

    &.is-hidden {
      width: 1px;
      height: 1px;
      border: 0;
      margin: -1px;
      padding: 0;
      overflow: hidden;
      position: fixed;
      outline: 0;
      left: 0;
      top: 0;
    }
  }

  .select-kit-errors-collection {
    background: var(--danger);
    padding: 0.25em 1em;
    margin: 0;
    width: 100%;
    box-sizing: border-box;

    .select-kit-error {
      list-style: none;
      color: var(--secondary);
    }
  }

  .no-content,
  .results-count {
    display: flex;
    flex: 1 0 auto;
    padding: 0.5em;
    width: 100%;
    box-sizing: border-box;
    background: var(--secondary);
  }

  .results-count {
    font-size: var(--font-down-1);
    color: var(--primary-med-or-secondary-med);
    position: absolute;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    padding: 0;
    border: 0;
    height: 1px;
    width: 1px;
    overflow: hidden;
    white-space: nowrap;
  }

  @keyframes lineDrawToRight {
    0% {
      width: 0;
    }
    100% {
      width: 100%;
    }
  }

  &.is-loading {
    .select-kit-filter::after {
      content: "";
      position: absolute;
      background: var(--tertiary);
      width: 100%;
      height: 2px;
      left: 0;
      bottom: 0;
      animation: lineDrawToRight 0.5s ease-in;
    }
  }
}