$base-font-size: 100%; $base-line-height: 1.7;
$body-font-size: 1.15em; $heading-font-size: 2em; $vertical-rhythm: $base-line-height * $body-font-size;
$type-ratio: 1.1618;
$breakpoint-medium: 75em; $breakpoint-small: 45em;
$medium-ratio: 0.9 * $type-ratio; $small-ratio: 0.8 * $type-ratio;