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              input.retrigger(type="radio" name="rerun" id="retrigger--1")
input.retrigger(type="radio" name="rerun" id="retrigger--2" checked)
.buttons
  label.button(for="retrigger--1" class="button--1") PLAY AGAIN
  label.button(for="retrigger--2" class="button--2") PLAY AGAIN

.logo
  span N 
  span E 
  span T
  span F
  span L
  span I
  span X

            
          
!
            
              /// Create the same keyframes twice (for retrigger in pure CSS)
/// @author Gregor Adams
/// @param  {Keyword} $name - name of the animation (will be suffixed with --1 and --2)
@mixin double-keyframes($name) {
  // write the keyframe rules to the document root
  @at-root {
    // write the same keyframes twice
    @for $i from 1 through 2 {
      $keyframe-name: unquote($name + "--" + $i);

      @keyframes #{$keyframe-name} {
        @content;
      }
    }
  }
}

/// Create a 3d-shadow in a certain direction
/// @author Gregor Adams
/// @param  {Number}        $depth - length of the shadow
/// @param  {Unit}          $color - color of the shadow
/// @param  {Unit}          $x     - step to next shadow on the x axis
/// @param  {Unit}          $y     - step to next shadow on the y axis
/// @param  {Unit}          $blur  - blur of the shadow
/// @param  {Color|false}   $mix   - optinally add a color to mix in
/// @return {List}          - returns a text-shadow
@function d3($depth, $color, $x: 1px, $y: 1px, $blur: 0, $mix: false) {
  $shadow: ();

  @for $i from 1 through $depth {
    // append to the existing shadow
    @if type-of($mix) != 'color' {
      $shadow: append($shadow, round($i * $x) round($i * $y) $blur $color, comma);

    } @else {
      $shadow: append($shadow, round($i * $x) round($i * $y) $blur mix($mix,$color,0.3%*$i), comma);
    }
  }

  @return $shadow;
}

// options

$c_fg:         #f00;
$c_bg:         #fff;
$c_3d:         #f2f2f2;
$c_shadow:     #dadada;
$c_shadow-mix: #6998da;

$google-font: Oswald; // should be a google font
$font-weight: 700;
$letters: 7;


// fonts
@import url(http://fonts.googleapis.com/css?family=#{$google-font}:#{$font-weight});

$font-family: $google-font, Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
// basic styles
html,
body {
  // force full viewport size
  height: 100%;
  width: 100%;
  // disable scrolling
  overflow: hidden;
}

body {
  // remove the body margin
  margin: 0;
  // create a flex-box model
  display: flex;
  flex-flow: row wrap;
  flex-wrap: wrap;
  flex-direction: row;
  align-items: flex-start;
  justify-content: center;
}

// hide the radios that allow us to retrigger the animation
.retrigger {
  position: absolute;
  left: -5em;
  opacity: 0;
}

// the section containing the retrigger button
.buttons {
  flex: 0 0 auto;
  height: 2em;
  line-height: 2em;
  background: $c_bg;
  text-align: center;
  cursor: pointer;
  user-select: none;
  
  // the labels are disguised as buttons
  .button {
    padding: 0.3em 1em;
    font-family: $font-family;
    color: $c_fg;
    font-size: 1.3em;
    display: none;
    cursor: pointer;
    border: 2px solid $c_fg;
    &:hover {
      color: $c_bg;
      background: $c_fg;
    }
    // display the label for the unchecked input
    @for $i from 1 through 2 {
      &--#{$i} {
        #retrigger--#{$i % 2 + 1}:checked ~ & {
          display: block;
        }
      }
    }
  }
}

// the logo area
.logo {
  // create a flex-box model
  flex: 0 0 100%;
  display: flex;
  justify-content: center;
  // set the perspective
  perspective: 1000px;
  perspective-origin: 50% 0%;
  // define fonts;
  font-size: 8em;
  font-family: $font-family;
  color: $c_bg;
  // scale the logo
  transform: scaleY(0.8);
}

// animation for the color
@include double-keyframes("color") {
  0% {
    color: $c_bg;
  }
  100% {
    color: $c_fg;
  }
}

// the letters
span {
  // enable webkit GPU rendering
  -webkit-backface-visibility: hidden;
  // animation settings
  animation-fill-mode: forwards;
  animation-timing-function: ease-in, ease-out, linear;

  // handle each letter separately
  @for $i from 1 through $letters {
    $offset: $i - ceil($letters / 2);
    $trans: if($offset > 0, -89.5deg, 89.5deg);

    &:nth-child(#{$i}) {
      $del: 1s + 0.1s * $i;
      $maxdel: 1s + 0.1s * $letters;
      $dur: 1s + 0.05s * $i;
      $maxdur: 1s + 0.05s * $letters;
      animation-delay: $del, $maxdel + $maxdur, $maxdel + $maxdur + 0.4s;
      animation-duration: $dur, 3s, 0.1s;

      // allow to run the animation again
      @for $j from 1 through 2 {
        #retrigger--#{$j}:checked ~ .logo & {
          animation-name: in_#{$i}--#{$j}, out_#{$i}--#{$j}, color--#{$j};
        }
      }

      // trans/de-form the letters
      transform-origin: 50% + 50%/$offset 200%;
      font-size: if($offset == 0,
        0.85em,
        0.9em + 0.015*pow(abs($offset),2));
    }
    
    // the animation magic
    @include double-keyframes("in_" + $i) {
      0% {
        transform: 
          if($offset == 0, scale(1, 1), scale(95.9 - abs($offset) * 10, 1)) 
          if($offset == 0, translatey(0%), rotatey($trans));
        text-shadow: 
          d3(15, rgba($c_3d, 0), 0, 0), 
          d3(50, rgba($c_shadow, 0), 0, 0);
      }

      50% {
        transform: 
          if($offset == 0, scale(1.2, 1.2), scale(126.2 - abs($offset) * 10, 1.2)) 
          if($offset == 0, translatey(-16%), rotatey($trans));
        text-shadow: 
          d3(15, $c_3d, if($offset == 0, 0, -0.25px * $offset), 0), 
          d3(50, $c_shadow, 1px, 3px, 3px, $c_shadow-mix);
      }

      100% {
        transform: 
          if($offset == 0, scale(1.1, 1.1), scale(116.2 - abs($offset) * 10, 1.1)) 
          if($offset == 0, translatey(-12%), rotatey($trans));
        text-shadow: 
          d3(15, $c_3d, if($offset == 0, 0, -0.25px * $offset), 0), 
          d3(50, $c_shadow, 1px, 3px, 3px, $c_shadow-mix);
      }
    }

    @include double-keyframes("out_" + $i) {
      0% {
        transform: 
          if($offset == 0, scale(1.1, 1.1), scale(116.2 - abs($offset) * 10, 1.1)) 
          if($offset == 0, translatey(-12%), rotatey($trans));
        text-shadow: 
          d3(15, $c_3d, if($offset == 0, 0, -0.25px * $offset), 0), 
          d3(50, $c_shadow, 1px, 3px, 3px, $c_shadow-mix);
      }

      20% {
        transform: 
          if($offset == 0, scale(1.05, 1.05), scale(105.9 - abs($offset) * 10, 1.05)) 
          if($offset == 0, translatey(-7%), rotatey($trans));
        text-shadow: 
          d3(15, rgba($c_3d, 0), 0, 0), 
          d3(50, rgba($c_shadow, 0), 0, 0);
      }

      100% {
        transform: 
          if($offset == 0, scale(1, 1), scale(95.9 - abs($offset) * 10, 1)) 
          if($offset == 0, translatey(0%), rotatey($trans));
        text-shadow: 
          d3(15, rgba($c_3d, 0), 0, 0), 
          d3(50, rgba($c_shadow, 0), 0, 0);
      }
    }
  }
}

            
          
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