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- generations = 8

mixin branches(n)

mixin tree(n)
    p=n + " generations"
    p=Math.pow(2, n+1)-1 + " divs (branches)"

              // --- Play whith these vars !!! ---
$l = 25vmin
$w = ($l / 10)
$angle = 30deg
$spread = 30deg
$speed = 0.5hz
$scale = 0.72
// -----------------------------------

  padding 0
  margin 0
  overflow hidden
  height 100%
  width 100%
  background-color #fff

  perspective 100px

  margin 20px
  padding 0px 20px
  background-color #ccc
  display inline-block

$time = unit(1 / $speed, 's')

.trunk div
  background hsl(200,75%,30%)
  will-change transform
  // border-radius $w
  width $l
  height $w
  position absolute
  margin-left - $w
  animation-name rot
  animation-duration $time * 1.13281
  animation-iteration-count infinite
  animation-direction alternate
  transform-origin ($w/2) ($w/2)
  animation-timing-function ease-in-out
    bottom 0
    left 50%
    animation-name rot-root
    animation-duration $time*1.23214

    // opacity 0.9 // blur :(
    top 0
    left $l
    animation-duration calc(inherit / 2) // don't works :(
      // animation-duration 15s
      animation-name rot-inv
      animation-duration ($time/1.12527)

@keyframes rot
    transform rotate($angle - $spread/2) scale($scale)
    transform rotate($angle + $spread/2) scale($scale)

@keyframes rot-inv
    transform rotate(- $angle - $spread/2) scale($scale)
    transform rotate(- $angle + $spread/2) scale($scale)

@keyframes rot-root
    transform rotate(-95deg)
    transform rotate(-85deg)

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