// --------------------------------------------------------------
// == mixins */
// --------------------------------------------------------------

@mixin flow($font-size, $bf: $base-font, $lh: $line-height) {
  $lh-value: $base-font * $lh;
  $coeff: ceil($font-size / $lh-value);
  $new-lh: ($lh-value / $font-size) * $coeff;
  $margin-bottom: $new-lh / $coeff;

  margin-bottom: $margin-bottom + em;
  font-size: $font-size / 10 + rem;
  line-height: $new-lh;
}