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HTML

CSS

@import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap");
@font-face {
  font-family: "Doom";
  src: url("https://assets.codepen.io/383755/Upheaval.woff2") format("woff2");
}
body,
html {
  image-rendering: pixelated;
  cursor: crosshair;
  position: fixed;
  overflow: hidden;
}
body *,
html * {
  cursor: crosshair;
}
body:has(.inner span:nth-of-type(6) input:checked):before,
html:has(.inner span:nth-of-type(6) input:checked):before {
  opacity: 1;
}
@supports (animation-timeline: scroll()) {
  body:has(#logo input:checked),
html:has(#logo input:checked) {
    position: relative;
    overflow: auto;
  }
}
body:has(#logo input:checked) #weapon,
html:has(#logo input:checked) #weapon {
  bottom: 50px;
}
body:has(#logo input:checked) #hud,
html:has(#logo input:checked) #hud {
  transform: translateY(0);
}
body:has(#logo input:checked):active #weapon,
html:has(#logo input:checked):active #weapon {
  animation: shoot 0.125s steps(3, end) 1;
}
@keyframes shoot {
  to {
    background-position: -255px 20px;
  }
}

body {
  background: #000;
}

body:before {
  content: "victory";
  color: #222;
  background: rgba(255, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100vw;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  font-family: "Doom";
  font-size: 14vmin;
  backdrop-filter: blur(4px);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease-in-out 0.5s;
}

::-webkit-scrollbar {
  width: 6px;
  height: 0px;
}

::-webkit-scrollbar-track {
  background: #000;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, #e9544b, #f9ef51 75%);
}

@keyframes rotate {
  0% {
    transform: translateY(0px);
  }
  20% {
    transform: translateY(150px) rotate(0deg);
  }
  30% {
    transform: translateY(200px) rotate(90deg);
    transform-origin: 50% calc(50% + 100px);
  }
  40% {
    transform: translateY(300px) rotate(90deg);
    transform-origin: 50% calc(50% - 0px);
  }
  50% {
    transform: translateX(100px) translateY(300px) rotate(0deg);
    transform-origin: 50% calc(50% - 0px);
  }
  60% {
    transform: translateX(100px) translateY(400px) rotate(0deg);
    transform-origin: 50% calc(50% - 150px);
  }
  65% {
    transform: translateY(450px) rotate(-90deg);
    transform-origin: 50% calc(50% - 200px);
  }
  75% {
    transform: translateY(550px) rotate(-90deg);
    transform-origin: 50% calc(50% - 200px);
  }
  80% {
    transform: translateY(600px) rotate(-90deg);
    transform-origin: 50% calc(50% - 200px);
  }
  85% {
    transform: translateX(100px) translateY(650px) rotate(-180deg);
    transform-origin: 50% calc(50% - 200px);
  }
  90% {
    transform: translateX(100px) translateY(800px) rotate(-180deg);
    transform-origin: 50% calc(50% - 200px);
  }
  100% {
    transform: translateX(200px) translateY(800px) rotate(-180deg);
    transform-origin: 50% calc(50% - 200px);
  }
}
#level {
  transform: translateY(0px) translateZ(300px) rotateX(85deg);
}

.inner {
  animation: rotate linear;
  animation-timeline: scroll();
  animation-range: entry 0 cover 100%;
  transform-origin: 50% calc(50% + 100px);
}

body {
  display: grid;
  place-items: center;
  height: clamp(1200px, 2000vh, 2000vh);
  width: 100vw;
  pointer-events: none;
}
body * {
  pointer-events: none;
}
body:has(#logo input:checked) #wrapper #level .inner span:first-of-type {
  animation-play-state: running;
}
@supports (animation-timeline: scroll()) {
  body input {
    pointer-events: all;
  }
}
body input:checked {
  pointer-events: none;
}

#wrapper {
  width: 600px;
  height: 600px;
  box-shadow: 0 0 0 1px;
  position: fixed;
  top: calc(50vh - 300px);
  left: calc(50vw - 300px);
  perspective: 600px;
  z-index: -1;
}

#level {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transform-style: preserve-3d;
}
#level * {
  transform-style: preserve-3d;
}
#level *:before, #level *:after {
  transform-style: preserve-3d;
}
#level .inner {
  background: url("https://assets.codepen.io/383755/C99.png");
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  grid-column-gap: 0px;
  grid-row-gap: 0px;
}
#level .inner:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: url("https://assets.codepen.io/383755/C64.png");
  top: 0;
  left: 0;
  transform: translateZ(calc(600px / 9));
}
#level .inner svg {
  position: absolute;
  width: 100%;
  height: 100%;
}
#level .inner svg path {
  fill: none;
  stroke: red;
  stroke-width: 10px;
}
#level .inner > span {
  image-rendering: pixelated;
  grid-area: 7/5/8/6;
  transform-origin: bottom;
  --y: 0deg;
  --x: -90deg;
  position: relative;
  transform: rotateX(var(--x)) rotateY(var(--y)) scale(0.75) translateZ(-50px);
  animation: approach 2s steps(18, end) 1 forwards var(--delay, 0s);
  animation-play-state: paused;
}
@keyframes approach {
  to {
    transform: rotateX(var(--x)) rotateY(var(--y)) scale(0.75) translateZ(var(--z, 50px));
  }
}
#level .inner > span:nth-of-type(2), #level .inner > span:nth-of-type(3) {
  grid-area: 5/3/6/4;
  --y: 90deg;
  --delay: 2s;
}
#level .inner > span:nth-of-type(3) {
  grid-area: 6/3/7/4;
  --z: 0px;
  --delay: 0s;
}
#level .inner > span:nth-of-type(3):before {
  background: url(https://assets.codepen.io/383755/demon1.gif) 50% 50%/contain no-repeat;
}
#level .inner > span:nth-of-type(4) {
  grid-area: 2/8/3/9;
  --y: -90deg;
  --delay: 2s;
}
#level .inner > span:nth-of-type(4):before {
  background: url(https://assets.codepen.io/383755/caco-cacodemon.gif) 50% 50%/contain no-repeat;
}
#level .inner > span:nth-of-type(4):before, #level .inner > span:nth-of-type(4):after {
  left: -25%;
}
#level .inner > span:nth-of-type(5) {
  grid-area: 5/7/6/8;
  --y: -180deg;
  --delay: 2s;
}
#level .inner > span:nth-of-type(5):before {
  background: url(https://assets.codepen.io/383755/demon1.gif) 50% 100%/contain no-repeat;
}
#level .inner > span:nth-of-type(6) {
  grid-area: 8/8/9/9;
  --y: -180deg;
  --delay: 0s;
}
#level .inner > span:nth-of-type(6):before {
  background: url(https://assets.codepen.io/383755/demon4.gif) 50% 100%/contain no-repeat;
  width: 150%;
  left: -25%;
}
#level .inner > span:has(input:checked):after {
  opacity: 1;
  animation-play-state: running;
}
#level .inner > span:has(input:checked):before {
  opacity: 0;
}
#level .inner > span:has(input:checked) + span {
  animation-play-state: running;
}
#level .inner > span:before, #level .inner > span:after {
  content: "";
  position: absolute;
  width: calc(100% - 18px);
  height: 100%;
  bottom: 0;
  left: 0;
  --offset: 3px;
  pointer-events: none;
  background: url(https://assets.codepen.io/383755/demon3.gif) 50% 25%/contain no-repeat;
}
#level .inner > span:after {
  --offset: 0px;
  animation: move 0.5s steps(6, end) 1 forwards;
  background: url("https://assets.codepen.io/383755/doom-explosion.png") 2px 50%/auto 50px no-repeat;
  animation-play-state: paused;
  opacity: 0;
}
@keyframes move {
  to {
    background-position: calc(100% + var(--offset)) 50%;
  }
}
#level .inner > span input {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  z-index: 999;
}
#level .inner > div:before, #level .inner > div:after {
  content: "";
  position: absolute;
}
#level .inner > div:nth-of-type(1) {
  grid-area: 9/4/10/6;
  background: url("https://assets.codepen.io/383755/C4.png");
  transform-origin: bottom;
  transform: rotateX(-90deg) rotateY(-90deg);
}
#level .inner > div:nth-of-type(1):before {
  content: "";
  position: absolute;
  width: 300%;
  height: 100%;
  top: 0;
  right: 50%;
  transform: translateZ(calc(600px / -9));
  background: inherit;
}
#level .inner > div:nth-of-type(2) {
  background: url("https://assets.codepen.io/383755/C4.png");
  grid-area: 8/2/9/5;
  transform-origin: bottom;
  transform: rotateX(-90deg);
}
#level .inner > div:nth-of-type(2):before, #level .inner > div:nth-of-type(2):after {
  height: 100%;
  width: 200%;
  right: 100%;
  top: 0;
  background: url("https://assets.codepen.io/383755/C4.png");
  transform-origin: right;
  transform: rotateY(-90deg);
}
#level .inner > div:nth-of-type(2):after {
  background: url("https://assets.codepen.io/383755/C19.png");
  width: 66%;
  right: 0%;
}
#level .inner > div:nth-of-type(3), #level .inner > div:nth-of-type(5) {
  grid-area: 2/2/3/3;
  transform-origin: bottom;
  transform: rotateX(-90deg);
  background: url("https://assets.codepen.io/383755/C19.png");
}
#level .inner > div:nth-of-type(3):before, #level .inner > div:nth-of-type(5):before {
  width: 200%;
  height: 100%;
  left: -100%;
  transform-origin: right;
  top: 0;
  transform: rotateY(-90deg);
  background: url("https://assets.codepen.io/383755/C4.png");
}
#level .inner > div:nth-of-type(4) {
  grid-area: 1/1/2/10;
  transform-origin: bottom;
  transform: rotateX(-90deg);
  background: url("https://assets.codepen.io/383755/C4.png");
}
#level .inner > div:nth-of-type(4):before, #level .inner > div:nth-of-type(4):after {
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: url("https://assets.codepen.io/383755/C4.png");
  transform: rotateY(90deg);
  transform-origin: right;
}
#level .inner > div:nth-of-type(4):after {
  left: auto;
  right: 0;
  width: 44%;
  transform: translateZ(500px);
  background: url("https://assets.codepen.io/383755/C4.png");
}
#level .inner > div:nth-of-type(5) {
  grid-area: 4/5/5/6;
}
#level .inner > div:nth-of-type(5):before, #level .inner > div:nth-of-type(5):after {
  width: 100%;
  height: 100%;
  background: inherit;
  top: 0;
  left: 0;
  transform-origin: left;
  transform: rotateY(90deg);
}
#level .inner > div:nth-of-type(5):after {
  width: 200%;
  transform: translateZ(200px);
  left: 101%;
}

#logo {
  position: fixed;
  background: url("https://assets.codepen.io/383755/580b57fcd9996e24bc43c34d.png") 50% 50%/auto 40vh no-repeat, rgba(0, 0, 0, 0.75);
  z-index: 10;
  width: 100vw;
  height: 100vh;
  top: 0;
  left: 0;
  animation: load 0.5s ease-in-out 1 forwards paused;
  pointer-events: none;
  transition: 0.3s ease-in-out;
}
#logo:has(input:checked) {
  animation-play-state: running;
  background-position: 50% calc(50% - 100vh);
}
#logo:has(input:checked):before, #logo:has(input:checked):after {
  transform: translate(-50%, 100vh);
}
#logo input {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
}
#logo:before, #logo:after {
  content: "scroll";
  font-family: "Doom";
  color: #f9ef51;
  background-image: linear-gradient(to bottom, #e9544b 0%, #f9ef51 50%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 8vh;
  position: absolute;
  left: 50%;
  top: calc(50% + 10vh);
  transform: translate(-50%, 0);
  transition: 0.3s ease-in-out 0.05s;
}
#logo:before {
  -webkit-text-stroke: 2px #666;
  transition-delay: 0.1s;
}
#logo:after {
  -webkit-text-fill-color: #fff;
  content: "sorry, your browser does not support scroll timeline";
  font-family: "Press Start 2p", sans-serif;
  text-align: center;
  font-size: 3vh;
  top: calc(50% + 20vh);
  animation: flashing 0.5s ease-in-out infinite alternate;
}
@keyframes flashing {
  to {
    opacity: 0.5;
  }
}
@supports (animation-timeline: scroll()) {
  #logo:after {
    content: "click anywhere to start";
    font-size: 1vh;
  }
}
@keyframes load {
  0%, 50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

#weapon {
  background: url("https://i.imgur.com/dpySZUG.png") 0% 20px/auto 1072px no-repeat;
  --scale: 5;
  position: fixed;
  z-index: 9;
  width: 90px;
  height: 154px;
  left: calc(50% + 7.5vh);
  bottom: -500px;
  transition: 0.5s ease-in-out 0.45s;
  transform-origin: bottom;
  transform: scale(var(--scale));
  animation: bounce 1s steps(4, end) infinite alternate;
}
@keyframes bounce {
  to {
    transform: scale(var(--scale)) translateY(5px);
  }
}
@media (max-height: 768px) {
  #weapon {
    --scale: 4;
  }
}

#hud {
  position: fixed;
  z-index: 999;
  background: #333;
  box-shadow: 0 0 0 5px #444;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: clamp(25px, 7.5vh, 100px);
  transform: translateY(200%);
  transition: 0.5s ease-in-out 0.3s;
}
#hud:before {
  content: "";
  position: absolute;
  aspect-ratio: 1/1;
  height: clamp(30px, 8vh, 125px);
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 0);
  box-shadow: inset 0 0 0 1px #000, 0 0 0 5px #444;
  background: url("https://assets.codepen.io/383755/grin-doomguy.gif") 0% 50%/contain no-repeat, #666;
}