/*
 *@名称: mixins
 *@功能: 实用混入
 */

/* 清除浮动 */
.clearfix {
  *zoom: 1;
  &:before,
  &:after {
    display: table;
    content: "";
    line-height: 0;
  }
  &:after {
    clear: both;
  }
}

/* Webkit-style focus */
.tab-focus() {
  // Default
  outline: thin dotted #333;
  // Webkit
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}

/* IE7 内联块 */
.ie7-inline-block() {
  *display: inline; /* IE7 inline-block hack */
  *zoom: 1;
}
// IE7 likes to collapse whitespace on either side of the inline-block elements.
// Ems because we're attempting to match the width of a space character. Left
// version is for form buttons, which typically come after other elements, and
// right version is for icons, which come before. Applying both is ok, but it will
// mean that space between those elements will be .6em (~2 space characters) in IE7,
// instead of the 1 space in other browsers.
.ie7-restore-left-whitespace() {
  *margin-left: .3em;

  &:first-child {
    *margin-left: 0;
  }
}

.ie7-restore-right-whitespace() {
  *margin-right: .3em;
}

/* 调整大小快捷方式 */
.size(@width, @height) {
  width: @width;
  height: @height;
}
.square(@size) {
  .size(@size, @size);
}

/* 占位符文本颜色 */
.placeholder(@color: @placeholderText) {
  &:-moz-placeholder {
    color: @color;
  }
  &:-ms-input-placeholder {
    color: @color;
  }
  &::-webkit-input-placeholder {
    color: @color;
  }
}

/*
 *文本溢出 
 *@Requires inline-block or block for proper styling
 */
.text-overflow() {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* CSS图片替换 */
.hide-text {
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

/* 字体 */
#font {
  #family {
    .serif() {
      font-family: @serifFontFamily;
    }
    .sans-serif() {
      font-family: @sansFontFamily;
    }
    .monospace() {
      font-family: @monoFontFamily;
    }
  }
  .shorthand(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .serif(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
    #font > #family > .serif;
    #font > .shorthand(@size, @weight, @lineHeight);
  }
  .sans-serif(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
    #font > #family > .sans-serif;
    #font > .shorthand(@size, @weight, @lineHeight);
  }
  .monospace(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
    #font > #family > .monospace;
    #font > .shorthand(@size, @weight, @lineHeight);
  }
}

/* 表单 */
// 块级输入框
.input-block-level {
  display: block;
  width: 100%;
  min-height: @inputHeight; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
  .box-sizing(border-box); // Makes inputs behave like true block-level elements
}

// 混入表单域状态
.formFieldState(@textColor: #555, @borderColor: #ccc, @backgroundColor: #f5f5f5) {
  // Set the text color
  .control-label,
  .help-block,
  .help-inline {
    color: @textColor;
  }
  // 相应输入框样式
  .checkbox,
  .radio,
  input,
  select,
  textarea {
    color: @textColor;
  }
  input,
  select,
  textarea {
    border-color: @borderColor;
    .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
    &:focus {
      border-color: darken(@borderColor, 10%);
      @shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
      .box-shadow(@shadow);
    }
  }
  // 给出一个输入框前置/后置的小背景颜色
  .input-prepend .add-on,
  .input-append .add-on {
    color: @textColor;
    background-color: @backgroundColor;
    border-color: @textColor;
  }
}

/* CSS3 属性 */
// 圆角
.border-radius(@radius) {
  -webkit-border-radius: @radius;
     -moz-border-radius: @radius;
          border-radius: @radius;
}
// 单个圆角
.border-top-left-radius(@radius) {
  -webkit-border-top-left-radius: @radius;
      -moz-border-radius-topleft: @radius;
          border-top-left-radius: @radius;
}
.border-top-right-radius(@radius) {
  -webkit-border-top-right-radius: @radius;
      -moz-border-radius-topright: @radius;
          border-top-right-radius: @radius;
}
.border-bottom-right-radius(@radius) {
  -webkit-border-bottom-right-radius: @radius;
      -moz-border-radius-bottomright: @radius;
          border-bottom-right-radius: @radius;
}
.border-bottom-left-radius(@radius) {
  -webkit-border-bottom-left-radius: @radius;
      -moz-border-radius-bottomleft: @radius;
          border-bottom-left-radius: @radius;
}

// 单边圆角
.border-top-radius(@radius) {
  .border-top-right-radius(@radius);
  .border-top-left-radius(@radius);
}
.border-right-radius(@radius) {
  .border-top-right-radius(@radius);
  .border-bottom-right-radius(@radius);
}
.border-bottom-radius(@radius) {
  .border-bottom-right-radius(@radius);
  .border-bottom-left-radius(@radius);
}
.border-left-radius(@radius) {
  .border-top-left-radius(@radius);
  .border-bottom-left-radius(@radius);
}

// 阴影
.box-shadow(@shadow) {
  -webkit-box-shadow: @shadow;
     -moz-box-shadow: @shadow;
          box-shadow: @shadow;
}

// 过渡
.transition(@transition) {
  -webkit-transition: @transition;
     -moz-transition: @transition;
       -o-transition: @transition;
          transition: @transition;
}
.transition-delay(@transition-delay) {
  -webkit-transition-delay: @transition-delay;
     -moz-transition-delay: @transition-delay;
       -o-transition-delay: @transition-delay;
          transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
  -webkit-transition-duration: @transition-duration;
     -moz-transition-duration: @transition-duration;
       -o-transition-duration: @transition-duration;
          transition-duration: @transition-duration;
}

// 变换
.rotate(@degrees) {
  -webkit-transform: rotate(@degrees);
     -moz-transform: rotate(@degrees);
      -ms-transform: rotate(@degrees);
       -o-transform: rotate(@degrees);
          transform: rotate(@degrees);
}
.scale(@ratio) {
  -webkit-transform: scale(@ratio);
     -moz-transform: scale(@ratio);
      -ms-transform: scale(@ratio);
       -o-transform: scale(@ratio);
          transform: scale(@ratio);
}
.translate(@x, @y) {
  -webkit-transform: translate(@x, @y);
     -moz-transform: translate(@x, @y);
      -ms-transform: translate(@x, @y);
       -o-transform: translate(@x, @y);
          transform: translate(@x, @y);
}
.skew(@x, @y) {
  -webkit-transform: skew(@x, @y);
     -moz-transform: skew(@x, @y);
      -ms-transform: skewX(@x) skewY(@y); // See https://github.com/twitter/bootstrap/issues/4885
       -o-transform: skew(@x, @y);
          transform: skew(@x, @y);
  -webkit-backface-visibility: hidden; // See https://github.com/twitter/bootstrap/issues/5319
}
.translate3d(@x, @y, @z) {
  -webkit-transform: translate3d(@x, @y, @z);
     -moz-transform: translate3d(@x, @y, @z);
       -o-transform: translate3d(@x, @y, @z);
          transform: translate3d(@x, @y, @z);
}

/*
 *隐藏内容背面 
 *@Prevent browsers from flickering when using CSS 3D transforms
 *@Default value is `visible`, but can be changed to `hidden
 */
.backface-visibility(@visibility){
  -webkit-backface-visibility: @visibility;
     -moz-backface-visibility: @visibility;
          backface-visibility: @visibility;
}

/*
 *背景裁剪 
 *@Heads up: FF 3.6 and under need "padding" instead of "padding-box"
 */
.background-clip(@clip) {
  -webkit-background-clip: @clip;
     -moz-background-clip: @clip;
          background-clip: @clip;
}

// 背景大小
.background-size(@size) {
  -webkit-background-size: @size;
     -moz-background-size: @size;
       -o-background-size: @size;
          background-size: @size;
}

// 盒模型大小
.box-sizing(@boxmodel) {
  -webkit-box-sizing: @boxmodel;
     -moz-box-sizing: @boxmodel;
          box-sizing: @boxmodel;
}

/*
 *控制可选择
 *@For selecting text on the page
 */
.user-select(@select) {
  -webkit-user-select: @select;
     -moz-user-select: @select;
      -ms-user-select: @select;
       -o-user-select: @select;
          user-select: @select;
}

// 调整元素大小
.resizable(@direction) {
  resize: @direction; // Options: horizontal, vertical, both
  overflow: auto; // Safari fix
}

// CSS3 内容列
.content-columns(@columnCount, @columnGap: @gridGutterWidth) {
  -webkit-column-count: @columnCount;
     -moz-column-count: @columnCount;
          column-count: @columnCount;
  -webkit-column-gap: @columnGap;
     -moz-column-gap: @columnGap;
          column-gap: @columnGap;
}

// 可选连字符
.hyphens(@mode: auto) {
  word-wrap: break-word;
  -webkit-hyphens: @mode;
     -moz-hyphens: @mode;
      -ms-hyphens: @mode;
       -o-hyphens: @mode;
          hyphens: @mode;
}

// 不透明度
.opacity(@opacity) {
  opacity: @opacity / 100;
  filter: ~"alpha(opacity=@{opacity})";
}

/* 背景 */
// 添加任意背景或边框颜色值的alpha透明度
#translucent {
  .background(@color: @white, @alpha: 1) {
    background-color: @color;
    background-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
    @alphaHex: `Math.floor(@{alpha} * 255).toString(16)`;
    @colorIE: `"@{color}".replace(/#/, "#"+@{alphaHex})`;
    filter: ~`'progid:DXImageTransform.Microsoft.gradient(startColorstr=@{colorIE},endColorstr=@{colorIE})'`;
    zoom: 1;
  }
  .border(@color: @white, @alpha: 1) {
    border-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
    .background-clip(padding-box);
  }
}

// 按钮和警告的渐变条颜色
.gradientBar(@primaryColor, @secondaryColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
  color: @textColor;
  text-shadow: @textShadow;
  #gradient > .vertical(@primaryColor, @secondaryColor);
  border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);
}

// 渐变
#gradient {
  .horizontal(@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(to right, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down
  }
  .vertical(@startColor: #555, @endColor: #333) {
    background-color: mix(@startColor, @endColor, 60%);
    background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down
  }
  .directional(@startColor: #555, @endColor: #333, @deg: 45deg) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(@deg, @startColor, @endColor); // Standard, IE10
  }
  .horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: mix(@midColor, @endColor, 80%);
    background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
    background-repeat: no-repeat;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
  }

  .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: mix(@midColor, @endColor, 80%);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-repeat: no-repeat;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
  }
  .radial(@innerColor: #555, @outerColor: #333) {
    background-color: @outerColor;
    background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
    background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
    background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
    background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
    background-repeat: no-repeat;
  }
  .striped(@color: #555, @angle: 45deg) {
    background-color: @color;
    background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
    background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    background-image: -o-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
  }
}
// 为IE重设滤镜
.reset-filter() {
  filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}

/* 组件混入 */
/*
 *水平分隔栏
 *@基于一条水平线分割下拉菜单和导航列表
 */
.nav-divider(@top: #e5e5e5, @bottom: @white) {
  // IE7 needs a set width since we gave a height. Restricting just
  // to IE7 to keep the 1px left/right space in other browsers.
  // It is unclear where IE is getting the extra space that we need
  // to negative-margin away, but so it goes.
  *width: 100%;
  height: 1px;
  margin: ((@baseLineHeight / 2) - 1) 1px; // 8px 1px
  *margin: -5px 0 5px;
  overflow: hidden;
  background-color: @top;
  border-bottom: 1px solid @bottom;
}

// 按钮背景
.buttonBackground(@startColor, @endColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
  // gradientBar will set the background to a pleasing blend of these, to support IE<=9
  .gradientBar(@startColor, @endColor, @textColor, @textShadow);
  *background-color: @endColor; /* Darken IE7 buttons by default so they stand out more given they won't have borders */
  .reset-filter();

  // in these cases the gradient won't cover the background, so we override
  &:link, &:visited, &:hover, &:focus, &:active, &.active, &.disabled, &[disabled] {
    color: @textColor;
    background-color: @endColor;
    *background-color: darken(@endColor, 5%);
  }

  // IE 7 + 8 can't handle box-shadow to show active, so we darken a bit ourselves
  &:active,
  &.active {
    background-color: darken(@endColor, 10%) e("\9");
  }
}

// 导航栏元素垂直居中
.navbarVerticalAlign(@elementHeight) {
  margin-top: (@navbarHeight - @elementHeight) / 2;
}

// 元素垂直居中
.verticalMiddle(@elementHeight){
    height: @elementHeight;
    line-height: @elementHeight;
}

/* 栅格系统 */
// 容器元素居中
.container-fixed() {
  margin-right: auto;
  margin-left: auto;
  .clearfix();
}

// 表格列
.tableColumns(@columnSpan: 1) {
  float: none; // undo default grid column styles
  width: ((@gridColumnWidth) * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1)) - 16; // 16 is total padding on left and right of table cells
  margin-left: 0; // undo default grid column styles
}