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Código fuente de JavaScript del juego de la serpiente HTML Canvas

HTML

CSS

body {
  display: grid;
  place-content: center;
  height: 100vh;
  background: #fa5b00;
}

#wrapper {
  position: relative;
  transform: scale(0.5) translate(25px, 140px);
  transition: 1s ease-in-out;
  opacity: 0;
  animation: fadeIn 0.5s ease-in-out 1 forwards 1.25s;
}
@keyframes fadeIn {
  to {
    opacity: 1;
  }
}
#wrapper:has(input:checked) {
  transform: scale(0.5) translate(-20px, -140px);
}
#wrapper:has(input:checked) #inner {
  transform: scaleY(-1) translate(0, -275px);
  transition-delay: 1.25s;
}
#wrapper #inner {
  width: auto;
  height: auto;
  transition: 0s linear 0s;
}
#wrapper div:not(#inner) {
  position: absolute;
  width: 30px;
  height: 30px;
  background: #000;
  top: 0;
  left: 0;
  border-radius: 100%;
  offset-path: path("M 60 70 L 140 70 A 30 30 0 1 1 140 140 L 80 140 A 30 30 0 1 0 80 210 L 140 210 A 30 30 0 1 1 140 280 L 80 280 A 30 30 0 0 0 80 350 L 160 350 ");
  offset-distance: 0.25%;
  transition: offset-distance 1s ease-in-out, background 0.2s ease-in-out;
}
#wrapper input {
  position: absolute;
  z-index: 9;
  width: 35px;
  height: 35px;
  left: 45px;
  top: 52.5px;
  opacity: 0;
  cursor: pointer;
}
#wrapper input:hover ~ div:not(#inner) {
  background: #555;
}
#wrapper input:checked {
  top: auto;
  left: auto;
  right: 55px;
  bottom: 55px;
}
#wrapper input:checked ~ svg path {
  animation: drawInOut 1s ease-in-out 1 forwards;
}
@keyframes drawInOut {
  0% {
    stroke-dashoffset: 800px;
  }
  50% {
    stroke-dashoffset: 0px;
  }
  100% {
    stroke-dashoffset: -725px;
  }
}
#wrapper input:checked ~ div:not(#inner) {
  offset-distance: 99.75%;
  transition-delay: 0.15s, 0s;
}

svg {
  min-width: 230px;
  min-height: 420px;
}
svg path {
  fill: none;
  stroke: #000;
  stroke-linecap: round;
  stroke-width: 70px;
  stroke-dasharray: 880px;
  stroke-dashoffset: 800px;
  transition: 1s ease-in-out;
  animation: drawOutIn 1s ease-in-out 1 forwards;
}
@keyframes drawOutIn {
  0% {
    stroke-dashoffset: -700px;
  }
  50% {
    stroke-dashoffset: 0px;
  }
  100% {
    stroke-dashoffset: 825px;
  }
}
svg path:last-of-type {
  stroke: #fff;
  stroke-width: 40px;
}