@nice-blue: #5B83AD;
@light-blue: @nice-blue + #111;

#header {
  color: @light-blue;
}


#header {
  color: #6c94be;
}


.bordered {
  border-top: dotted 1px black;
  border-bottom: solid 2px black;
}


#menu a {
  color: #111;
  .bordered;
}

.post a {
  color: red;
  .bordered;
}


#header {
  color: black;
}
#header .navigation {
  font-size: 12px;
}
#header .logo {
  width: 300px;
}


#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;
  }
}


.screen-color {
  @media screen {
    color: green;
    @media (min-width: 768px) {
      color: red;
    }
  }
  @media tv {
    color: black;
  }
}


@media screen {
  .screen-color {
    color: green;
  }
}
@media screen and (min-width: 768px) {
  .screen-color {
    color: red;
  }
}
@media tv {
  .screen-color {
    color: black;
  }
}


#a {
  color: blue;
  @font-face {
    src: made-up-url;
  }
  padding: 2 2 2 2;
}


#a {
  color: blue;
}
@font-face {
  src: made-up-url;
}
#a {
  padding: 2 2 2 2;
}


// 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


@color: #224488 / 2; //results in #112244
background-color: #112244 + #111; // result is #223355


.weird-element {
  content: ~"^//* some horrible but needed css hack";
}


@base: #f04615;
@width: 0.5;

.class {
  width: percentage(@width); // returns `50%`
  color: saturate(@base, 5%);
  background-color: spin(lighten(@base, 25%), 8);
}


#bundle {
  .button {
    display: block;
    border: 1px solid black;
    background-color: grey;
    &:hover {
      background-color: white
    }
  }
  .tab { /* ... */ }
  .citation { /* ... */ }
}


#header a {
  color: orange;
  #bundle > .button;
}


@var: red;

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


@var: red;

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


/* One hell of a block
style comment! */
@var: red;

// Get in line!
@var: white;


@import "library"; // library.less
@import "typo.css";


a,
.link {
  color: #428bca;
}
.widget {
  color: #fff;
  background: #428bca;
}


// Variables
@link-color:        #428bca; // sea blue
@link-color-hover:  darken(@link-color, 10%);

// Usage
a,
.link {
  color: @link-color;
}
a:hover {
  color: @link-color-hover;
}
.widget {
  color: #fff;
  background: @link-color;
}


// Variables
@my-selector: banner;

// Usage
.@{my-selector} {
  font-weight: bold;
  line-height: 40px;
  margin: 0 auto;
}


.banner {
  font-weight: bold;
  line-height: 40px;
  margin: 0 auto;
}


// Variables
@images: "../img";

// Usage
body {
  color: #444;
  background: url("@{images}/white-sand.png");
}


// Variables
@themes: "../../src/themes";

// Usage
@import "@{themes}/tidal-wave.less";


@property: color;

.widget {
  @{property}: #0ee;
  background-@{property}: #999;
}


.widget {
  color: #0ee;
  background-color: #999;
}


@fnord:  "I am fnord.";
@var:    "fnord";
content: @@var;


content: "I am fnord.";


.lazy-eval {
  width: @var;
}

@var: @a;
@a: 9%;


.lazy-eval-scope {
  width: @var;
  @a: 9%;
}

@var: @a;
@a: 100%;


.lazy-eval-scope {
  width: 9%;
}


@var: 0;
.class {
  @var: 1;
  .brass {
    @var: 2;
    three: @var;
    @var: 3;
  }
  one: @var;
}


.class {
  one: 1;
}
.class .brass {
  three: 3;
}


// library
@base-color: green;
@dark-color: darken(@base-color, 10%);

// use of library
@import "library.less";
@base-color: red;


nav ul {
  &:extend(.inline);
  background: blue;
}


nav ul {
  &:extend(.inline);
  background: blue;
}
.inline {
  color: red;
}


nav ul {
  background: blue;
}
.inline,
nav ul {
  color: red;
}


.a:extend(.b) {}

// the above block does the same thing as the below block
.a {
  &:extend(.b);
}


.c:extend(.d all) {
  // extends all instances of ".d" e.g. ".x.d" or ".d.x"
}
.c:extend(.d) {
  // extends only instances where the selector will be output as just ".d"
}


.e:extend(.f) {}
.e:extend(.g) {}

// the above an the below do the same thing
.e:extend(.f, .g) {}


.big-division,
.big-bag:extend(.bag),
.big-bucket:extend(.bucket) {
  // body
}


pre:hover,
.some-class {
  &:extend(div pre);
}


pre:hover:extend(div pre),
.some-class:extend(div pre) {}


.bucket {
  tr { // nested ruleset with target selector
    color: blue;
  }
}
.some-class:extend(.bucket tr) {} // nested ruleset is recognized


.bucket tr,
.some-class {
  color: blue;
}


.bucket {
  tr & { // nested ruleset with target selector
    color: blue;
  }
}
.some-class:extend(tr .bucket) {} // nested ruleset is recognized


tr .bucket,
.some-class {
  color: blue;
}


.a.class,
.class.a,
.class > .a {
  color: blue;
}
.test:extend(.class) {} // this will NOT match the any selectors above


*.class {
  color: blue;
}
.noStar:extend(.class) {} // this will NOT match the *.class selector


*.class {
  color: blue;
}


link:hover:visited {
  color: blue;
}
.selector:extend(link:visited:hover) {}


link:hover:visited {
  color: blue;
}


:nth-child(1n+3) {
  color: blue;
}
.child:extend(:nth-child(n+3)) {}


:nth-child(1n+3) {
  color: blue;
}


[title=identifier] {
  color: blue;
}
[title='identifier'] {
  color: blue;
}
[title="identifier"] {
  color: blue;
}

.noQuote:extend([title=identifier]) {}
.singleQuote:extend([title='identifier']) {}
.doubleQuote:extend([title="identifier"]) {}


[title=identifier],
.noQuote,
.singleQuote,
.doubleQuote {
  color: blue;
}

[title='identifier'],
.noQuote,
.singleQuote,
.doubleQuote {
  color: blue;
}

[title="identifier"],
.noQuote,
.singleQuote,
.doubleQuote {
  color: blue;
}


.a.b.test,
.test.c {
  color: orange;
}
.test {
  &:hover {
    color: green;
  }
}

.replacement:extend(.test all) {}


.a.b.test,
.test.c,
.a.b.replacement,
.replacement.c {
  color: orange;
}
.test:hover,
.replacement:hover {
  color: green;
}


@variable: .bucket;
@{variable} { // interpolated selector
  color: blue;
}
.some-class:extend(.bucket) {} // does nothing, no match is found


.bucket {
  color: blue;
}
.some-class:extend(@{variable}) {} // interpolated selector matches nothing
@variable: .bucket;


.bucket {
  color: blue;
}


.bucket {
  color: blue;
}
@{variable}:extend(.bucket) {}
@variable: .selector;


.bucket, .selector {
  color: blue;
}


@media print {
  .screenClass:extend(.selector) {} // extend inside media
  .selector { // this will be matched - it is in the same media
    color: black;
  }
}
.selector { // ruleset on top of style sheet - extend ignores it
  color: red;
}
@media screen {
  .selector {  // ruleset inside another media - extend ignores it
    color: blue;
  }
}


@media print {
  .selector,
  .screenClass { /*  ruleset inside the same media was extended */
    color: black;
  }
}
.selector { /* ruleset on top of style sheet was ignored */
  color: red;
}
@media screen {
  .selector { /* ruleset inside another media was ignored */
    color: blue;
  }
}


@media screen {
  .screenClass:extend(.selector) {} // extend inside media
  @media (min-width: 1023px) {
    .selector {  // ruleset inside nested media - extend ignores it
      color: blue;
    }
  }
}


@media screen and (min-width: 1023px) {
  .selector { /* ruleset inside another nested media was ignored */
    color: blue;
  }
}


@media screen {
  .selector {  /* ruleset inside nested media - top level extend works */
    color: blue;
  }
  @media (min-width: 1023px) {
    .selector {  /* ruleset inside nested media - top level extend works */
      color: blue;
    }
  }
}

.topLevel:extend(.selector) {} /* top level extend matches everything */


@media screen {
  .selector,
  .topLevel { /* ruleset inside media was extended */
    color: blue;
  }
}
@media screen and (min-width: 1023px) {
  .selector,
  .topLevel { /* ruleset inside nested media was extended */
    color: blue;
  }
}


.alert-info,
.widget {
  /* declarations */
}

.alert:extend(.alert-info, .widget) {}


.alert-info,
.widget,
.alert,
.alert {
  /* declarations */
}


.animal {
  background-color: black;
  color: white;
}


.animal {
  background-color: black;
  color: white;
}
.bear {
  background-color: brown;
}

.animal {
  background-color: black;
  color: white;
}
.bear {
  &:extend(.animal);
  background-color: brown;
}


.my-inline-block() {
  display: inline-block;
  font-size: 0;
}
.thing1 {
  .my-inline-block;
}
.thing2 {
  .my-inline-block;
}


.thing1 {
  display: inline-block;
  font-size: 0;
}
.thing2 {
  display: inline-block;
  font-size: 0;
}


.my-inline-block {
  display: inline-block;
  font-size: 0;
}
.thing1 {
  &:extend(.my-inline-block);
}
.thing2 {
  &:extend(.my-inline-block);
}


.my-inline-block,
.thing1,
.thing2 {
  display: inline-block;
  font-size: 0;
}


li.list > a {
  // list styles
}
button.list-style {
  &:extend(li.list > a); // use the same list styles
}


.a, #b {
  color: red;
}
.mixin-class {
  .a();
}
.mixin-id {
  #b();
}


.a, #b {
  color: red;
}
.mixin-class {
  color: red;
}
.mixin-id {
  color: red;
}


// these two statements do the same thing:
.a();
.a;


.my-mixin {
  color: black;
}
.my-other-mixin() {
  background: white;
}
.class {
  .my-mixin;
  .my-other-mixin;
}


.my-mixin {
  color: black;
}
.class {
  color: black;
  background: white;
}


.my-hover-mixin() {
  &:hover {
    border: 1px solid red;
  }
}
button {
  .my-hover-mixin();
}


button:hover {
  border: 1px solid red;
}


#outer {
  .inner {
    color: red;
  }
}

.c {
  #outer > .inner;
}


// all do the same thing
#outer > .inner;
#outer > .inner();
#outer .inner;
#outer .inner();
#outer.inner;
#outer.inner();


#my-library {
  .my-mixin() {
    color: black;
  }
}
// which can be used like this
.class {
  #my-library > .my-mixin();
}


#namespace when (@mode=huge) {
  .mixin() { /* */ }
}

#namespace {
  .mixin() when (@mode=huge) { /* */ }
}


#sp_1 when (default()) {
  #sp_2 when (default()) {
    .mixin() when not(default()) { /* */ }
  }
}


.foo (@bg: #f5f5f5, @color: #900) {
  background: @bg;
  color: @color;
}
.unimportant {
  .foo();
}
.important {
  .foo() !important;
}


.unimportant {
  background: #f5f5f5;
  color: #900;
}
.important {
  background: #f5f5f5 !important;
  color: #900 !important;
}


.border-radius(@radius) {
  -webkit-border-radius: @radius;
     -moz-border-radius: @radius;
          border-radius: @radius;
}


#header {
  .border-radius(4px);
}
.button {
  .border-radius(6px);
}


.border-radius(@radius: 5px) {
  -webkit-border-radius: @radius;
     -moz-border-radius: @radius;
          border-radius: @radius;
}


#header {
  .border-radius;
}


.wrap() {
  text-wrap: wrap;
  white-space: -moz-pre-wrap;
  white-space: pre-wrap;
  word-wrap: break-word;
}

pre { .wrap }


pre {
  text-wrap: wrap;
  white-space: -moz-pre-wrap;
  white-space: pre-wrap;
  word-wrap: break-word;
}


.mixin(@color) {
  color-1: @color;
}
.mixin(@color; @padding: 2) {
  color-2: @color;
  padding-2: @padding;
}
.mixin(@color; @padding; @margin: 2) {
  color-3: @color;
  padding-3: @padding;
  margin: @margin @margin @margin @margin;
}
.some .selector div {
  .mixin(#008000);
}


.some .selector div {
  color-1: #008000;
  color-2: #008000;
  padding-2: 2;
}


.mixin(@color: black; @margin: 10px; @padding: 20px) {
  color: @color;
  margin: @margin;
  padding: @padding;
}
.class1 {
  .mixin(@margin: 20px; @color: #33acfe);
}
.class2 {
  .mixin(#efca44; @padding: 40px);
}


.class1 {
  color: #33acfe;
  margin: 20px;
  padding: 20px;
}
.class2 {
  color: #efca44;
  margin: 10px;
  padding: 40px;
}


.box-shadow(@x: 0; @y: 0; @blur: 1px; @color: #000) {
  -webkit-box-shadow: @arguments;
     -moz-box-shadow: @arguments;
          box-shadow: @arguments;
}
.big-block {
  .box-shadow(2px; 5px);
}


.big-block {
  -webkit-box-shadow: 2px 5px 1px #000;
     -moz-box-shadow: 2px 5px 1px #000;
          box-shadow: 2px 5px 1px #000;
}


.mixin(/* ... */) {}        // matches 0-N arguments
.mixin() {}           // matches exactly 0 arguments
.mixin(@a: 1) {}      // matches 0-1 arguments
.mixin(@a: 1; /* ... */) {} // matches 0-N arguments
.mixin(@a; /* ... */) {}    // matches 1-N arguments


.mixin(@a; @rest...) {
   // @rest is bound to arguments after @a
   // @arguments is bound to all arguments
}


.mixin(@s; @color) { /* ... */ }

.class {
  .mixin(@switch; #888);
}


.mixin(dark; @color) {
  color: darken(@color, 10%);
}
.mixin(light; @color) {
  color: lighten(@color, 10%);
}
.mixin(@_; @color) {
  display: block;
}


@switch: light;

.class {
  .mixin(@switch; #888);
}


.class {
  color: #a2a2a2;
  display: block;
}


.mixin(@a) {
  color: @a;
}
.mixin(@a; @b) {
  color: fade(@a; @b);
}


.mixin() {
  @width:  100%;
  @height: 200px;
}

.caller {
  .mixin();
  width:  @width;
  height: @height;
}


.caller {
  width:  100%;
  height: 200px;
}


.average(@x, @y) {
  @average: ((@x + @y) / 2);
}

div {
  .average(16px, 50px); // "call" the mixin
  padding: @average;    // use its "return" value
}


div {
  padding: 33px;
}


.mixin() {
  @size: in-mixin;
  @definedOnlyInMixin: in-mixin;
}

.class {
  margin: @size @definedOnlyInMixin;
  .mixin();
}

@size: globally-defined-value; // callers parent scope - no protection


.class {
  margin: in-mixin in-mixin;
}


.unlock(@value) { // outer mixin
  .doSomething() { // nested mixin
    declaration: @value;
  }
}

#namespace {
  .unlock(5); // unlock doSomething mixin
  .doSomething(); //nested mixin was copied here and is usable
}


#namespace {
  declaration: 5;
}


// declare detached ruleset
@detached-ruleset: { background: red; };

// use detached ruleset
.top {
    @detached-ruleset();
}


.top {
  background: red;
}


.desktop-and-old-ie(@rules) {
  @media screen and (min-width: 1200px) { @rules(); }
  html.lt-ie9 &                         { @rules(); }
}

header {
  background-color: blue;

  .desktop-and-old-ie({
    background-color: red;
  });
}


header {
  background-color: blue;
}
@media screen and (min-width: 1200px) {
  header {
    background-color: red;
  }
}
html.lt-ie9 header {
  background-color: red;
}


@my-ruleset: {
    .my-selector {
      background-color: black;
    }
  };


@my-ruleset: {
    .my-selector {
      @media tv {
        background-color: black;
      }
    }
  };
@media (orientation:portrait) {
    @my-ruleset();
}


@media (orientation: portrait) and tv {
  .my-selector {
    background-color: black;
  }
}


// detached ruleset with a mixin
@detached-ruleset: {
    .mixin() {
        color:blue;
    }
};
// call detached ruleset
.caller {
    @detached-ruleset();
    .mixin();
}


.caller {
  color: blue;
}


@detached-ruleset: {
    @color:blue; // this variable is private
};
.caller {
    color: @color; // syntax error
}


@detached-ruleset: {
  caller-variable: @caller-variable; // variable is undefined here
  .caller-mixin(); // mixin is undefined here
};

selector {
  // use detached ruleset
  @detached-ruleset();

  // define variable and mixin needed inside the detached ruleset
  @caller-variable: value;
  .caller-mixin() {
    variable: declaration;
  }
}


selector {
  caller-variable: value;
  variable: declaration;
}


@variable: global;
@detached-ruleset: {
  // will use global variable, because it is accessible
  // from detached-ruleset definition
  variable: @variable;
};

selector {
  @detached-ruleset();
  @variable: value; // variable defined in caller - will be ignored
}


selector {
  variable: global;
}


@detached-1: { scope-detached: @one @two; };
.one {
  @one: visible;
  .two {
    @detached-2: @detached-1; // copying/renaming ruleset
    @two: visible; // ruleset can not see this variable
  }
}

.use-place {
  .one > .two();
  @detached-2();
}


#space {
  .importer-1() {
    @detached: { scope-detached: @variable; }; // define detached ruleset
  }
}

.importer-2() {
  @variable: value; // unlocked detached ruleset CAN see this variable
  #space > .importer-1(); // unlock/import detached ruleset
}

.use-place {
  .importer-2(); // unlock/import detached ruleset second time
   @detached();
}


.use-place {
  scope-detached: value;
}

@my-ruleset:{.my-selector{@media tv{background-color:black;}}};

.foo {
  background: #900;
}
@import "this-is-valid.less";


@import "foo";      // foo.less is imported
@import "foo.less"; // foo.less is imported
@import "foo.php";  // foo.php imported as a less file
@import "foo.css";  // statement left in place, as-is


.navbar:extend(.navbar all) {}


@import (less) "foo.css";


@import (css) "foo.less";


@import "foo.less";


@import (once) "foo.less";
@import (once) "foo.less"; // this statement will be ignored


// file: foo.less
.a {
  color: green;
}
// file: main.less
@import (multiple) "foo.less";
@import (multiple) "foo.less";


.a {
  color: green;
}
.a {
  color: green;
}


.mixin (@a) when (lightness(@a) >= 50%) {
  background-color: black;
}
.mixin (@a) when (lightness(@a) < 50%) {
  background-color: white;
}
.mixin (@a) {
  color: @a;
}


.class1 { .mixin(#ddd) }
.class2 { .mixin(#555) }


.class1 {
  background-color: black;
  color: #ddd;
}
.class2 {
  background-color: white;
  color: #555;
}


.truth (@a) when (@a) { /* ... */ }
.truth (@a) when (@a = true) { /* ... */ }


.class {
  .truth(40); // Will not match any of the above definitions.
}


@media: mobile;

.mixin (@a) when (@media = mobile) { /* ... */ }
.mixin (@a) when (@media = desktop) { /* ... */ }

.max (@a; @b) when (@a > @b) { width: @a }
.max (@a; @b) when (@a < @b) { width: @b }


.mixin (@a) when (isnumber(@a)) and (@a > 0) { /* ... */ }


.mixin (@a) when (@a > 10), (@a < -10) { /* ... */ }


.mixin (@b) when not (@b > 0) { /* ... */ }


.mixin (@a; @b: 0) when (isnumber(@b)) { /* ... */ }
.mixin (@a; @b: black) when (iscolor(@b)) { /* ... */ }


.mixin (@a) when (@a > 0) { /* ... */  }
.mixin (@a) when (default()) { /* ... */ } // matches only if first mixin does not, i.e. when @a <= 0


.my-optional-style() when (@my-option = true) {
  button {
    color: white;
  }
}
.my-optional-style();


button when (@my-option = true) {
  color: white;
}


& when (@my-option = true) {
  button {
    color: white;
  }
  a {
    color: blue;
  }
}


.loop(@counter) when (@counter > 0) {
  .loop((@counter - 1));    // next iteration
  width: (10px * @counter); // code for each iteration
}

div {
  .loop(5); // launch the loop
}


div {
  width: 10px;
  width: 20px;
  width: 30px;
  width: 40px;
  width: 50px;
}


.generate-columns(4);

.generate-columns(@n, @i: 1) when (@i =< @n) {
  .column-@{i} {
    width: (@i * 100% / @n);
  }
  .generate-columns(@n, (@i + 1));
}


.column-1 {
  width: 25%;
}
.column-2 {
  width: 50%;
}
.column-3 {
  width: 75%;
}
.column-4 {
  width: 100%;
}


.mixin() {
  box-shadow+: inset 0 0 10px #555;
}
.myclass {
  .mixin();
  box-shadow+: 0 0 20px black;
}


.myclass {
  box-shadow: inset 0 0 10px #555, 0 0 20px black;
}


.mixin() {
  transform+_: scale(2);
}
.myclass {
  .mixin();
  transform+_: rotate(15deg);
}


.myclass {
  transform: scale(2) rotate(15deg);
}


a {
  color: blue;
  &:hover {
    color: green;
  }
}


a {
  color: blue;
}

a:hover {
  color: green;
}


.button {
  &-ok {
    background-image: url("ok.png");
  }
  &-cancel {
    background-image: url("cancel.png");
  }

  &-custom {
    background-image: url("custom.png");
  }
}


.button-ok {
  background-image: url("ok.png");
}
.button-cancel {
  background-image: url("cancel.png");
}
.button-custom {
  background-image: url("custom.png");
}


.link {
  & + & {
    color: red;
  }

  & & {
    color: green;
  }

  && {
    color: blue;
  }

  &, &ish {
    color: cyan;
  }
}


.link + .link {
  color: red;
}
.link .link {
  color: green;
}
.link.link {
  color: blue;
}
.link, .linkish {
  color: cyan;
}


.grand {
  .parent {
    & > & {
      color: red;
    }

    & & {
      color: green;
    }

    && {
      color: blue;
    }

    &, &ish {
      color: cyan;
    }
  }
}


.grand .parent > .grand .parent {
  color: red;
}
.grand .parent .grand .parent {
  color: green;
}
.grand .parent.grand .parent {
  color: blue;
}
.grand .parent,
.grand .parentish {
  color: cyan;
}


.header {
  .menu {
    border-radius: 5px;
    .no-borderradius & {
      background-image: url('images/button-background.png');
    }
  }
}


.header .menu {
  border-radius: 5px;
}
.no-borderradius .header .menu {
  background-image: url('images/button-background.png');
}


p, a, ul, li {
  border-top: 2px dotted #366;
  & + & {
    border-top: 0;
  }
}


p,
a,
ul,
li {
  border-top: 2px dotted #366;
}
p + p,
p + a,
p + ul,
p + li,
a + p,
a + a,
a + ul,
a + li,
ul + p,
ul + a,
ul + ul,
ul + li,
li + p,
li + a,
li + ul,
li + li {
  border-top: 0;
}

.foobar {
  &:extend(.foo);
}

.thing {
  &:hover {
    background-color: blue;
    .thing-child {}
  }
}

.foo,
  // Comment
.bar {
  // Comment
  color: red; // Comment
}

// Variables
@link-color: #428bca; // Comment

[href]:hover &, // Comment
[href]:focus &, // Comment
[href]:active & {
  .tooltip {
    opacity: 1;
  }
}

// Usage
@import // Comment
  "@{themes}/tidal-wave.less";

// Mixin with escaped /
.margin-bottom-1\/3() {
  margin-bottom: 0.8rem;
}

label {
  .margin-bottom-1\/3;
}

// whitespace between variable and colon, #2925 #4090
@FoO : bar;

// should not parse as custom-selector
@custom-selector     :--icon #id;
