$enable-responsive-font-sizes {\n      $min-width: null;\n      $variable-unit: null;\n\n      // Calculate minimum font-size for given font-size\n      $fs-min: $rfs-base-font-size + ($fs - $rfs-base-font-size) / $rfs-factor;\n\n      // Calculate difference between given font-size and minimum font-size for given font-size\n      $fs-diff: $fs - $fs-min;\n\n      // Base font-size formatting\n      // No need to check if the unit is valid, because we did that before\n      $min-width: if($rfs-font-size-unit...