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/* referenced from http://lesscss.org/ */
/*  Variables  */
@width: 10px;
@height: @width + 10px;

#header {
  width: @width;
  height: @height;
} 
/*  Mixins  */
.bordered {
  border-top: dotted 1px black;
  border-bottom: solid 2px black;
}
#menu a {
  color: #111;
  .bordered();
}

.post a {
  color: red;
  .bordered();
}
/*  Nesting  */
#header {
  color: black;
  .navigation {
    font-size: 12px;
  }
  .logo {
    width: 300px;
  }
}
.clearfix {
  display: block;
  zoom: 1;

&:after {
    content: " ";
    display: block;
    font-size: 0;
    height: 0;
    clear: both;
    visibility: hidden;
  }
}
/* Nested At-Rules and Bubbling */
.component {
  width: 300px;
  @media (min-width: 768px) {
    width: 600px;
    @media  (min-resolution: 192dpi) {
      background-image: url(/img/retina2x.png);
    }
  }
  @media (min-width: 1280px) {
    width: 800px;
  }
}
/* Operations */
// numbers are converted into the same units
// @conversion-1: 5cm + 10mm; // result is 6cm
// @conversion-2: 2 - 3cm - 5mm; // result is -1.5cm

// conversion is impossible
// @incompatible-units: 2 + 5px - 3cm; // result is 4px

// example with variables
// @base: 5%;
// @filler: @base * 2; // result is 10%
// @other: @base + @filler; // result is 15%

// @base: 2cm * 3mm; // result is 6cm
/* Escaping */
@min768: ~"(min-width: 768px)";
.element {
  @media @min768 {
    font-size: 1.2rem;
  }
}
/* Functions */
@base: #f04615;
@width: 0.5;

.my-class {
  width: percentage(@width); // returns `50%`
  color: saturate(@base, 5%);
  background-color: spin(lighten(@base, 25%), 8);
}
/* Namespaces and Accessors */
#bundle() {
  .button {
    display: block;
    border: 1px solid black;
    background-color: grey;
    &:hover {
      background-color: white;
    }
  }
  // .tab { ... }
  // .citation { ... }
}
#header a {
  color: orange;
  #bundle.button();  // can also be written as #bundle > .button
}
/* Maps */
#colors() {
  primary: blue;
  secondary: green;
}

.button {
  color: #colors[primary];
  border: 1px solid #colors[secondary];
}
/* Scope */
@var: red;

#page {
  @var: white;
  #header {
    color: @var; // white
  }
}