I was planning to use LESS css in my project (PHP). I am planning to use its nested @media query feature. I find that it fails to group the multiple media queries in the output css it generates.

For example:

// LESS
.header {
  @media all and (min-width: 240px) and (max-width: 319px) {
    font-size: 12px;
  }

  @media all and (min-width: 320px) and (max-width: 479px) {
    font-size: 16px;
    font-weight: bold;
  }
}

.body {
  @media all and (min-width: 240px) and (max-width: 319px) {
    font-size: 10px;
  }

  @media all and (min-width: 320px) and (max-width: 479px) {
    font-size: 12px;
  }
}

// output CSS
@media all and (min-width: 240px) and (max-width: 319px) {
  .header {
    font-size: 12px;
  }
}
@media all and (min-width: 320px) and (max-width: 479px) {
  .header {
    font-size: 16px;
    font-weight: bold;
  }
}
@media all and (min-width: 240px) and (max-width: 319px) {
  .body {
    font-size: 10px;
  }
}
@media all and (min-width: 320px) and (max-width: 479px) {
  .body {
    font-size: 12px;
  }
}

My expected output is (@media queries grouped)

@media all and (min-width: 240px) and (max-width: 319px) {
  .header {
    font-size: 12px;
  }
  .body {
    font-size: 10px;
  }
}
@media all and (min-width: 320px) and (max-width: 479px) {
  .header {
    font-size: 16px;
    font-weight: bold;
  }
  .body {
    font-size: 12px;
  }
}

I would like to know if it can be done in LESS it self or is there any simple CSS parser I can use to manipulate the output CSS to group the @media queries.