// Variables.

$zi-highest: 50;
$zi-high: 40;
$zi-medium: 30;
$zi-low: 20;
$zi-lowest: 10;
$zi-ground: 0;
$zi-below-ground: -1;

// Transition speeds.
$standard--transition-speed: 300ms;
$transition: $standard--transition-speed ease-in-out;
$transition-fast: 0.1s linear;
$motion-slow: 1000ms ease-in-out;
$motion-default: 500ms ease-in-out;
$motion-fast: 200ms ease-in-out;
$motion-super-fast: 50ms ease-in-out;