*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}
body {
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background-color: #e8e8e8;
  font-family:arial;
}
.radio-form {
  display: block;
  margin: auto;
  max-width: 10em;
  position: relative;
}

.radio-form input {
  position: fixed;
  top: -1.5em;
  left: -1.5em;
}

.radio-form label {
  cursor: pointer;
  display: block;
  font-weight: bold;
  text-shadow: 0 0.1em 0.1em rgba(0, 0, 0, 0.2);
  transition: color 0.2s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.radio-form label:not(:last-of-type) {
  margin-bottom: 1.5em;
}

.radio-form label span {
  box-shadow: 0 0 0 0.2em currentColor inset, 0 0.2em 0.2em rgba(0, 0, 0, 0.2), 0 0.3em 0.2em rgba(0, 0, 0, 0.2) inset;
  display: inline-block;
  margin-right: 0.5em;
  vertical-align: bottom;
  border-radius: 50%;
  width: 1.5em;
  height: 1.5em;
  transition: transform 0.2s cubic-bezier(0.5, 0, 0.5, 2), box-shadow 0.2s cubic-bezier(0.45, 0.05, 0.55, 0.95), color 0.2s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.radio-form input:checked + label,
.radio-form input:checked + label span {
  color: #255ff4;
}

.radio-form input:checked + label,
.radio-form input:checked + label span {
  transition-delay: 0.4s;
}

.radio-form label span {
  transform: scale(1.2);
}

.radio-form .worm {
  top: 0.375em;
  left: 0.375em;
  position: absolute;
}

.radio-form .worm__segment {
  position: absolute;
  top: 0;
  left: 0;
  width: 0.75em;
  height: 0.75em;
  border-radius: 50%;
  transition: transform 0.4s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.radio-form .worm__segment:before {
  animation-duration: 0.4s;
  animation-timing-function: cubic-bezier(0.45, 0.05, 0.55, 0.95);
  background: currentColor;
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

.radio-form .worm__segment:first-child:before,
.radio-form .worm__segment:last-child:before {
  box-shadow: 0 0 1em 0 currentColor;
}

@keyframes hop1 {
  from,
  to {
    transform: translateX(0);
  }

  50% {
    transform: translateX(-1.5em);
  }
}

@keyframes hop2 {
  from,
  to {
    transform: translateX(0);
  }

  50% {
    transform: translateX(-1.5em);
  }
}

@keyframes hop3 {
  from,
  to {
    transform: translateX(0);
  }

  50% {
    transform: translateX(-1.5em);
  }
}

.radio-form input:nth-of-type(1):checked ~ .worm .worm__segment {
  transform: translateY(0);
}

.radio-form input:nth-of-type(1):checked ~ .worm .worm__segment:before {
  animation-name: hop1;
}

.radio-form input:nth-of-type(2):checked ~ .worm .worm__segment {
  transform: translateY(3em);
}

.radio-form input:nth-of-type(2):checked ~ .worm .worm__segment:before {
  animation-name: hop2;
}

.radio-form input:nth-of-type(3):checked ~ .worm .worm__segment {
  transform: translateY(6em);
}

.radio-form input:nth-of-type(3):checked ~ .worm .worm__segment:before {
  animation-name: hop3;
}

@media screen and (prefers-color-scheme: dark) {
  body {
    background: #17181c;
    color: #e3e4e8;
  }

  .radio-form input:checked + label,
  .radio-form input:checked + label span,
  .radio-form .worm__segment:before {
    color: #5583f6;
  }
}