// 组件允许单个组件打包，因此默认引入公共基础样式

@import "../../base.less";

@import "./_var.less";

@import "./_mixin.less";

.@{prefix-block} {
  position: fixed;
  z-index: @z-index-back-top;
  overflow: hidden;
  outline: none;
  border-color: transparent;
  background-color: transparent;
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  white-space: nowrap;
  border-width: .5px;
  border-style: solid;
  transition:
    background @anim-duration-base linear,
    border @anim-duration-base linear,
    color @anim-duration-base linear,
    opacity @anim-duration-base linear,
    visibility @anim-duration-base linear;
  touch-action: manipulation;
  box-shadow: @back-top-box-shadow;
  visibility: hidden;
  opacity: 0;

  &__text {
    font: @font-body-small;
    text-align: center;
    margin-top: @comp-margin-xxs;
  }

  &__icon {
    font-size: @font-headline-small;
  }

  &.l-size-m {
    .@{prefix-block}__icon {
      margin-top: 2px;
    }
  }
}

.@{prefix-block}--show {
  visibility: visible;
  opacity: 1;
}

@themes: light, primary, dark;

each(@themes, {
  .@{prefix-block}--theme-@{value} {
    .back-top-theme("@{value}");
  }
});

@m: medium;
@s: small;
@sizes: s, m;

each(@sizes, {
  .@{prefix-block}.@{prefix}-size-@{value} {
    .back-top-size(@@value)
  }
});

@shapes: circle, square;

each(@shapes, {
  .@{prefix-block}--@{value} {
    .back-top-shape("@{value}")
  }
})
