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              label.label(for='checkbox') CSS Firefly </br> Checkbox Replacement
div.checkbox-wrap 
  input#checkbox.checkbox(type='checkbox')
  label.firefly(for='checkbox')
    div.abdomen
      div.thorax
        div.head
          div.eyes
          div.antennae
      div.wings
        div.wing.wing-a
        div.wing.wing-b
      

            
          
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              $color-canvas: #1d1915;
$color-canvas: #0a2a43;
$color-glow: #fefa01;
$color-trim: #40341d;
$color-wing: #27231e;
$color-thorax: #d43b1f;
$color-shadow: #0e0a0a;
$color-text: #b8c5d0;

body{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  height:100vh;
  background:radial-gradient($color-canvas 30%, darken($color-canvas, 2%));
  font-family: 'Asap', sans-serif;
  &:after{
    content:'';
    display:block;
    position:absolute;
    top:1rem;
    right:1rem;
    bottom:1rem;
    left:1rem;
    border:4px solid darken($color-canvas, 5%);
    border-radius:2px;
    background:none;
    pointer-events:none;
  }
}

.label{
  flex:0;
  color:$color-text;
  letter-spacing:.04em;
  text-align:center;
  margin-bottom:2rem;
  font-size:3rem;
  @media screen and (min-width: 60rem){
    font-size:5vw;    
  }
}

.checkbox-wrap{
  flex:none;
  position:relative;
  width:10%;
  min-width:8rem;
  z-index:1;
  &:after{
    content:'';
    display:block;
    padding-top:50%;

  }
}

.checkbox{
  display:none;
}

.checkbox:checked ~ .firefly{
  .abdomen{
    background:$color-wing;
    box-shadow: inset 0 0 1.5rem rgba(150,0,0,.75);
    animation: flicker 4000ms ease infinite;
  }
  .wing-a{
    transform: rotate(30deg);
  }
  .wing-b{
    transform: rotate(-30deg);
  }  
}

.head{
  position:absolute;
  top:15%;
  left:60%;
  bottom:15%;
  background:$color-wing;
  width:70%;
  border-radius: 40% 80% 80% 40%;
  box-shadow: inset -.1rem 0 0 .3rem rgba($color-shadow, .2);
}

.eyes{
  position:absolute;
  top:-5%;
  right:10%;
  bottom:-5%;
  width:35%;
  &:before,&:after{
    content:'';
    display:block;
    position:absolute;
    right:0;
    width:100%;
    box-sizing:border-box;
    border-radius:100%;
    background: $color-shadow;
    padding-top:100%;
  }
  &:before{
    top:0;
  }
  &:after{
    bottom:0;
  }
}

.antennae{
  position:absolute;
  top:20%;
  left:-150%;
  bottom:20%;
  width:400%;
  z-index:-1;
  &:before,&:after{
    content:'';
    display:block;
    position:absolute;
    right:0;
    width:100%;
    box-sizing:border-box;
    border-color: $color-shadow;
    border-style:solid;
    padding-top:65%;
    border-width: .25rem .25rem .25rem 0;
  }
  &:before{
    top:80%;
    border-radius: 0 100% 100% 100% ;

  }
  &:after{
    bottom:80%;
    border-radius:100% 100% 100% 0;

  }
}


.thorax{
  position:absolute;
  top:0;
  left:100%;
  bottom:0;
  background:$color-thorax;
  width:30%; 
  border-radius: 20% 80% 80% 20%;
  box-shadow: inset -.1rem 0 .1rem .3rem rgba(0,0,0,.2);
}
.abdomen{
  position:absolute;
  top:10%;
  right:20%;
  bottom:10%;
  background:$color-wing;
  width:100%; 
  transition: all 1000ms ease;
  border-radius: 100% 30% 30% 100%;
  box-sizing:border-box;
  &:after{
    content:'';
    display:block;
    position:absolute;
    top:0;
    right:0;
    bottom:0;
    left:0;
    background:repeating-linear-gradient(90deg, 
      transparent 0, 
      transparent 15%,      
      rgba(0,0,20,.1) 15%, 
      rgba(0,0,20,.1) 20%

    );
    mix-blend-mode: multiply;
    border-radius: 100% 30% 30% 100%;
    z-index:0;
    box-shadow: inset -1rem 0 .2rem .3rem rgba(0,0,0,.1);

  }

}

.wings{
  position:absolute;
  top:-20%;
  right:0;
  bottom:-20%;
  left:-5%;
  z-index:1;

  .wing{
    position:absolute;
    right:0;
    background: repeating-linear-gradient(
      $color-wing 0%,
      $color-wing 40%,
      darken($color-wing,5%) 40%,
      darken($color-wing,5%) 60%
    );
    width:100%;
    height:50%;
    transition: all 200ms ease-out;
    border:1px solid $color-trim;
    box-sizing:border-box;
    box-shadow: inset .2rem 0 .1rem .5rem rgba(0,0,0,.5);

    &.wing-a{
      transform-origin:bottom right;
      top:0;
      border-radius: 90% 30% 0 20%;
    }
    &.wing-b{
      transform-origin:top right;
      top:50%;      
      border-radius: 20% 0 30% 90%;
    }

  }

}

@keyframes flicker{
  0%, 100%{
    background: $color-glow;
    box-shadow: 0 0 1rem $color-glow, inset -.25rem 0 0 .5rem rgba($color-shadow,.1);
  }
  30%, 70%{
    background: lighten($color-glow, 30%);    
    box-shadow: -1rem 0 8rem 1rem rgba($color-glow, 1), inset -.25rem 0 0 .5rem rgba($color-shadow,.1);
  }
  50%{    
    box-shadow: -1rem 0 8rem 1rem rgba($color-glow, .8), inset -.25rem 0 0 .5rem rgba($color-shadow,.1);
  }
}
            
          
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