ant-design/components/date-picker/style/index.less

@import '../../style/themes/index';
@import '../../style/mixins/index';
@import '../../input/style/mixin';
@import './panel';

@picker-prefix-cls: ~'@{ant-prefix}-picker';
@picker-text-height: 40px;

.picker-padding(@input-height, @font-size, @padding-horizontal) {
  // font height probably 22.0001， So use floor better
  @font-height: floor(@font-size * @line-height-base) + 2;
  @padding-top: (@input-height - @font-height) / 2;
  @padding-bottom: @input-height - @font-height - @padding-top;
  padding: @padding-top @padding-horizontal @padding-bottom;
}

.@{picker-prefix-cls} {
  @vertical-fix-base: @input-height-base - ceil(@font-size-base * @line-height-base) - 2 *
    @input-padding-vertical-base - 2 * @border-width-base;
  @vertical-fix-lg: @input-height-lg - ceil(@font-size-lg * @line-height-base) - 2 *
    @input-padding-vertical-lg - 2 * @border-width-base;
  @vertical-fix-sm: @input-height-sm - ceil(@font-size-base * @line-height-base) - 2 *
    @input-padding-vertical-sm - 2 * @border-width-base;
  @arrow-size: 10px;

  .reset-component;
  .picker-padding(@input-height-base, @font-size-base, @input-padding-horizontal-base);
  display: inline-flex;
  align-items: center;
  background: @picker-bg;
  border: @border-width-base @border-style-base @select-border-color;
  border-radius: @border-radius-base;
  transition: border @animation-duration-slow, box-shadow @animation-duration-slow;

  &:hover,
  &-focused {
    .hover();
  }

  &-focused {
    .active();
  }

  &&-disabled {
    background: @input-disabled-bg;
    border-color: @select-border-color;
  }

  // ======================== Input =========================
  &-input {
    position: relative;
    display: inline-flex;
    width: 100%;

    > input {
      .input();
      flex: auto;

      // Fix Firefox flex not correct:
      // https://github.com/ant-design/ant-design/pull/20023#issuecomment-564389553
      min-width: 1px;
      height: auto;
      padding: 0;
      background: transparent;

      border: 0;

      &:focus {
        box-shadow: none;
      }

      &[disabled] {
        background: transparent;
      }
    }

    &:hover {
      .@{picker-prefix-cls}-clear {
        opacity: 1;
      }
    }
  }

  // Size
  &-large {
    .picker-padding(@input-height-lg, @font-size-lg, @input-padding-horizontal-lg);

    .@{picker-prefix-cls}-input > input {
      font-size: @font-size-lg;
    }
  }

  &-small {
    .picker-padding(@input-height-sm, @font-size-base, @input-padding-horizontal-sm);
  }

  &-suffix {
    align-self: center;
    margin-left: @padding-xs / 2;
    color: @disabled-color;
    pointer-events: none;
  }

  &-clear {
    position: absolute;
    top: 50%;
    right: 0;
    color: @disabled-color;
    background: @component-background;
    transform: translateY(-50%);
    cursor: pointer;
    opacity: 0;
    transition: opacity @animation-duration-slow, color @animation-duration-slow;

    &:hover {
      color: @text-color-secondary;
    }
  }

  &-separator {
    display: inline-block;
    align-self: center;
    width: 2em;
    height: @font-size-lg;
    color: @disabled-color;
    font-size: @font-size-lg;
    line-height: @font-size-lg;
    text-align: center;
  }

  // ======================== Range =========================
  &-range {
    position: relative;
    display: inline-flex;

    // Clear
    .@{picker-prefix-cls}-clear {
      right: @input-padding-horizontal-base;
    }

    &:hover {
      .@{picker-prefix-cls}-clear {
        opacity: 1;
      }
    }

    // Active bar
    .@{picker-prefix-cls}-active-bar {
      bottom: -@border-width-base;
      height: 2px;
      margin-left: @input-padding-horizontal-base;
      background: @primary-color;
      opacity: 0;
      transition: all @animation-duration-slow ease-out;
      pointer-events: none;
    }

    &.@{picker-prefix-cls}-focused {
      .@{picker-prefix-cls}-active-bar {
        opacity: 1;
      }
    }
  }

  // ======================= Dropdown =======================
  &-dropdown {
    .reset-component;
    position: absolute;
    z-index: @zindex-picker;

    &-hidden {
      display: none;
    }

    &-placement-bottomLeft {
      .@{picker-prefix-cls}-range-arrow {
        top: @arrow-size / 2 - @arrow-size / 3;
        display: block;
        transform: rotate(-45deg);
      }
    }

    &-placement-topLeft {
      .@{picker-prefix-cls}-range-arrow {
        bottom: @arrow-size / 2 - @arrow-size / 3;
        display: block;
        transform: rotate(135deg);
      }
    }
  }

  &-dropdown-range {
    padding: (@arrow-size * 2 / 3) 0;

    &-hidden {
      display: none;
    }
  }

  // Time picker with additional style
  &-dropdown &-panel > &-time-panel {
    padding-top: @padding-xs / 2;
  }

  // ======================== Ranges ========================
  &-ranges {
    margin-bottom: 0;
    padding: @padding-xs / 2 @padding-sm;
    overflow: hidden;
    line-height: @picker-text-height - 2 * @border-width-base - @padding-xs / 2;
    text-align: left;
    list-style: none;

    > li {
      display: inline-block;
    }

    .@{picker-prefix-cls}-preset {
      cursor: pointer;
    }

    .@{picker-prefix-cls}-ok {
      float: right;
      margin-left: @padding-xs;
    }
  }

  &-range-wrapper {
    display: flex;
  }

  &-range-arrow {
    position: absolute;
    z-index: 1;
    display: none;
    width: @arrow-size;
    height: @arrow-size;
    margin-left: @input-padding-horizontal-base * 1.5;
    transition: left @animation-duration-slow ease-out;

    &::after {
      position: absolute;
      top: @border-width-base;
      right: @border-width-base;
      width: @arrow-size;
      height: @arrow-size;
      border: @arrow-size / 2 solid @border-color-split;
      border-color: @calendar-bg @calendar-bg transparent transparent;
      content: '';
    }
  }

  &-panel-container {
    overflow: hidden;
    vertical-align: top;
    background: @calendar-bg;
    border-radius: @border-radius-base;
    box-shadow: @box-shadow-base;
    transition: margin @animation-duration-slow;

    .@{picker-prefix-cls}-panels {
      display: inline-flex;
      flex-wrap: nowrap;
    }

    .@{picker-prefix-cls}-panel {
      vertical-align: top;
      background: transparent;
      border-width: 0 0 @border-width-base 0;
      border-radius: 0;

      &-focused {
        border-color: @border-color-split;
      }
    }
  }
}