<===> input.scss
a b {
  color: red;
  c d {
    height: 10;
  }
  e f {
    width: 12;
  }
}

@media all and (min-width: 960px) {
  b {
    font-weight: normal;
  }
}

@media (min-width: 980px) {
  a {
    color: red;
  }
}

@media screen and (all) {
  /* hey */
  p {
    color: blue;
    a {
      color: green;
      &:after {
        content: ">>";
      }
    }
  }
  span {
    display: inline-block;
  }
}

a b c {
  /* a */
  blee: blee;
  /* b */
  d e f {
    blah: blah;
    bloo: bloo;
  }
  /* c */
  g h, i j {
    @media print and (foo: 1 2 3), (bar: 3px hux(muz)), not screen {
      /* aa */
      hey: ho;
      /* bb */
      k l m {
        hee: fee;
      }
      /* cc */
      haa: hoo;
      /* dd */
    }
  }
  /* d */
  blah: blah;
}
<===> output.css
a b {
  color: red;
}
a b c d {
  height: 10;
}
a b e f {
  width: 12;
}

@media all and (min-width: 960px) {
  b {
    font-weight: normal;
  }
}
@media (min-width: 980px) {
  a {
    color: red;
  }
}
@media screen and (all) {
  /* hey */
  p {
    color: blue;
  }
  p a {
    color: green;
  }
  p a:after {
    content: ">>";
  }

  span {
    display: inline-block;
  }
}
a b c {
  /* a */
  blee: blee;
  /* b */
  /* c */
  /* d */
  blah: blah;
}
a b c d e f {
  blah: blah;
  bloo: bloo;
}
@media print and (foo: 1 2 3), (bar: 3px hux(muz)), not screen {
  a b c g h, a b c i j {
    /* aa */
    hey: ho;
    /* bb */
    /* cc */
    haa: hoo;
    /* dd */
  }
  a b c g h k l m, a b c i j k l m {
    hee: fee;
  }
}