// 过渡函数
$transition-fn: ease-in-out;

// 过渡持续时间
$transition-duration: 0.2s;
$transition-duration-quick: 0.12s;
$transition-duration-slow: 0.35s;

// 过渡
$transition: $transition-duration $transition-fn;
$transition-quick: $transition-duration-quick $transition-fn;
$transition-slow: $transition-duration-slow $transition-fn;