Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0)
// Compass (v1.0.0.alpha.18)
// ----

.block {
	background-color: black;
	.block__elem1 { background-color: tomato;}
	&__elem2      { background-color: chocolate; }
	& &__elem3    {
	  background-color: orange; 
    &__elem4    { background-color: gold;}
  	@at-root {
  	  &__elem4    { background-color: gold;}
  	}
  }
	@at-root {
	  &__elem4    { background-color: gold;}
	}
}

@media print {
  .block2 {
    background: tomato;
  	@at-root(without:media) {
  	  &__elem    { background-color: gold;}
  	}
  }
}

SassMeister-output.css

.block {
  background-color: black;
}
.block .block__elem1 {
  background-color: tomato;
}
.block__elem2 {
  background-color: chocolate;
}
.block .block__elem3 {
  background-color: orange;
}
.block .block__elem3__elem4 {
  background-color: gold;
}
.block .block__elem3__elem4 {
  background-color: gold;
}
.block__elem4 {
  background-color: gold;
}

@media print {
  .block2 {
    background: tomato;
  }
}
.block2__elem {
  background-color: gold;
}