#checklist {
  --background: #ffffff;
  --text: #414856;
  --check: #4F29F0;
  --disabled: #C3C8DE;
  --width: 100%;
  --height: 100%;
  --border-radius: 2%;
  background: var(--background);
  width: var(--width);
  height: var(--height);
  border-radius: var(--border-radius);
  position: relative;
  padding: 3% 9%;
  display: grid;
  grid-template-columns: 8% auto;
}
#checklist label {
  color: var(--text);
  position: relative;
  cursor: pointer;
  display: grid;
  align-items: center;
  width: fit-content;
  transition: color 0.3s ease;
}
#checklist label::before, #checklist label::after {
  content: "";
  position: absolute;
}
#checklist label::before {
  height: 2px;
  width: 8px;
  left: -27px;
  background: var(--check);
  border-radius: 2px;
  transition: background 0.3s ease;
}
#checklist label:after {
  height: 4px;
  width: 4px;
  top: 8px;
  left: -25px;
  border-radius: 50%;
}
#checklist input[type=checkbox] {
  -webkit-appearance: none;
  -moz-appearance: none;
  position: relative;
  height: 15px;
  width: 15px;
  outline: none;
  border: 0;
  margin: 0 15px 0 0;
  cursor: pointer;
  background: var(--background);
  display: grid;
  align-items: center;
}
#checklist input[type=checkbox]::before, #checklist input[type=checkbox]::after {
  content: "";
  position: absolute;
  height: 2px;
  top: auto;
  background: var(--check);
  border-radius: 2px;
}
#checklist input[type=checkbox]::before {
  width: 0px;
  right: 60%;
  transform-origin: right bottom;
}
#checklist input[type=checkbox]::after {
  width: 0px;
  left: 40%;
  transform-origin: left bottom;
}
#checklist input[type=checkbox]:checked::before {
  animation: check-01 0.4s ease forwards;
}
#checklist input[type=checkbox]:checked::after {
  animation: check-02 0.4s ease forwards;
}
#checklist input[type=checkbox]:checked + label {
  color: var(--disabled);
  animation: move 0.3s ease 0.1s forwards;
}
#checklist input[type=checkbox]:checked + label::before {
  background: var(--disabled);
  animation: slice 0.4s ease forwards;
}
#checklist input[type=checkbox]:checked + label::after {
  animation: firework 0.5s ease forwards 0.1s;
}

@keyframes move {
  50% {
    padding-left: 8px;
    padding-right: 0px;
  }
  100% {
    padding-right: 4px;
  }
}
@keyframes slice {
  60% {
    width: 100%;
    left: 4px;
  }
  100% {
    width: 100%;
    left: -2px;
    padding-left: 0;
  }
}
@keyframes check-01 {
  0% {
    width: 4px;
    top: auto;
    transform: rotate(0);
  }
  50% {
    width: 0px;
    top: auto;
    transform: rotate(0);
  }
  51% {
    width: 0px;
    top: 8px;
    transform: rotate(45deg);
  }
  100% {
    width: 5px;
    top: 8px;
    transform: rotate(45deg);
  }
}
@keyframes check-02 {
  0% {
    width: 4px;
    top: auto;
    transform: rotate(0);
  }
  50% {
    width: 0px;
    top: auto;
    transform: rotate(0);
  }
  51% {
    width: 0px;
    top: 8px;
    transform: rotate(-45deg);
  }
  100% {
    width: 10px;
    top: 8px;
    transform: rotate(-45deg);
  }
}
@keyframes firework {
  0% {
    opacity: 1;
    box-shadow: 0 0 0 -2px #4F29F0, 0 0 0 -2px #4F29F0, 0 0 0 -2px #4F29F0, 0 0 0 -2px #4F29F0, 0 0 0 -2px #4F29F0, 0 0 0 -2px #4F29F0;
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    box-shadow: 0 -15px 0 0px #4F29F0, 14px -8px 0 0px #4F29F0, 14px 8px 0 0px #4F29F0, 0 15px 0 0px #4F29F0, -14px 8px 0 0px #4F29F0, -14px -8px 0 0px #4F29F0;
  }
}

body {
  font: 400 16px "MartianMono_Condensed-Regular", sans-serif;
  display: flex;
  flex-direction: column;
  justify-content: left;
  align-items: left;
}

#checklist input[type=checkbox],
#checklist label {
  pointer-events: none;
  cursor: default;
}