// 按下去背景颜色
// -----------------------------------------------------------------------------
.tap-color(@color, @opacity: .9) {
  background-color: @color;
  &:active {
    background-color: @color * @opacity;
  }
}

// 遮罩层
// -----------------------------------------------------------------------------
.mask(@bgcolor: rgba(0, 0, 0, .4), @z-index: @base-zindex * 1500) {
  background-color: @bgcolor;
  position: fixed;
  z-index: @z-index;
  bottom: 0;
  right: 0;
  left: 0;
  top: 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}

// 多行文本溢出显示省略号
// -----------------------------------------------------------------------------
.line-clamp(@line: 2, @line-height: .38rem) {
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: @line;
  -webkit-box-orient: vertical;
  word-break: break-all;
  text-overflow: ellipsis;
  line-height: @line-height;
  max-height: @line-height * @line + .2rem;
}

// 单行文本溢出显示省略号
// -----------------------------------------------------------------------------
.text-overflow(@align: justify) {
  word-wrap: normal;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  text-align: @align;
}

// 三角形箭头
// -----------------------------------------------------------------------------
// @deg:  45deg - right
//       135deg - down
//       -45deg - up
//      -135deg - left
// ------------------------------------------------------------------------
.arrow(@color: #DDD, @width: .2rem, @border-width: 2px, @deg: 45deg) {
  content: '';
  display: inline-block;
  width: @width;
  height: @width;
  border-style: solid;
  border-color: @color;
  border-width: @border-width @border-width 0 0;
  -webkit-transform: rotate(@deg);
  transform: rotate(@deg);
}

// 一像素边框
// -----------------------------------------------------------------------------
.top-line(@color, @zindex: 0) {
  content: '';
  position: absolute;
  z-index: @zindex;
  top: 0;
  left: 0;
  width: 100%;
  border-top: 1px solid @color;
  -webkit-transform: scaleY(.5);
  transform: scaleY(.5);
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
}

.bottom-line(@color, @zindex: 0) {
  content: '';
  position: absolute;
  z-index: @zindex;
  bottom: 0;
  left: 0;
  width: 100%;
  border-bottom: 1px solid @color;
  -webkit-transform: scaleY(.5);
  transform: scaleY(.5);
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
}

.left-line(@color, @zindex: 0) {
  content: '';
  position: absolute;
  z-index: @zindex;
  top: 0;
  left: 0;
  height: 100%;
  border-left: 1px solid @color;
  -webkit-transform: scaleX(.5);
  transform: scaleX(.5);
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
}

.right-line(@color, @zindex: 0) {
  content: '';
  position: absolute;
  z-index: @zindex;
  top: 0;
  right: 0;
  height: 100%;
  border-right: 1px solid @color;
  -webkit-transform: scaleX(.5);
  transform: scaleX(.5);
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
}

.flex-center() {
  display: flex;
  justify-content: center;
  align-items: center;
}