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媒体查询(@media)

@media工作原理和在常规CSS中一样，但是，要使用Stylus的块状符号:

@media print
  #header
  #footer
    display none

@media print
  #header
  #footer
    display none

等同与:

@media print {
  #header,
  #footer {
    display: none;
  }
}

@media print {
  #header,
  #footer {
    display: none;
  }
}

Media Query Bubbling

Media queries can be nested, too, and they will be expanded to wrap the context in which they are used. For example:

.widget
  padding 10px

  @media screen and (min-width: 600px)
    padding 20px

.widget
  padding 10px

  @media screen and (min-width: 600px)
    padding 20px

Yielding:

.widget {
  padding: 10px;
}

@media screen and (min-width: 600px) {
  .widget {
    padding: 20px;
  }
}

.widget {
  padding: 10px;
}

@media screen and (min-width: 600px) {
  .widget {
    padding: 20px;
  }
}

Nested media queries

You can nest @medias one into another and they would combine into one:

@media (max-width: 500px)
  .foo
    color: #000

  @media (min-width: 100px), (min-height: 200px)
    .foo
      color: #100

@media (max-width: 500px)
  .foo
    color: #000

  @media (min-width: 100px), (min-height: 200px)
    .foo
      color: #100

Would yield to

@media (max-width: 500px) {
  .foo {
    color: #000;
  }
}
@media (max-width: 500px) and (min-width: 100px), (max-width: 500px) and (min-height: 200px) {
  .foo {
    color: #100;
  }
}

@media (max-width: 500px) {
  .foo {
    color: #000;
  }
}
@media (max-width: 500px) and (min-width: 100px), (max-width: 500px) and (min-height: 200px) {
  .foo {
    color: #100;
  }
}

插值和变量(Interpolations and variables)

You can use both interpolations and variables inside media queries, so it is possible to do things like this:

foo = 'width'
bar = 30em
@media (max-{foo}: bar)
  body
    color #fff

foo = 'width'
bar = 30em
@media (max-{foo}: bar)
  body
    color #fff

This would yield

@media (max-width: 30em) {
  body {
    color: #fff;
  }
}

@media (max-width: 30em) {
  body {
    color: #fff;
  }
}

It is also possible to use expressions inside MQ:

.foo
  for i in 1..4
    @media (min-width: 2**(i+7)px)
      width: 100px*i

.foo
  for i in 1..4
    @media (min-width: 2**(i+7)px)
      width: 100px*i

would yield to

@media (min-width: 256px) {
  .foo {
    width: 100px;
  }
}
@media (min-width: 512px) {
  .foo {
    width: 200px;
  }
}
@media (min-width: 1024px) {
  .foo {
    width: 300px;
  }
}
@media (min-width: 2048px) {
  .foo {
    width: 400px;
  }
}

@media (min-width: 256px) {
  .foo {
    width: 100px;
  }
}
@media (min-width: 512px) {
  .foo {
    width: 200px;
  }
}
@media (min-width: 1024px) {
  .foo {
    width: 300px;
  }
}
@media (min-width: 2048px) {
  .foo {
    width: 400px;
  }
}