@import url(https://fonts.bunny.net/css?family=noto-sans-mono:400);
@layer base, mouse, demo;

@layer demo{
  @property --page-offset {
    syntax: "<number>";
    inherits: true;
    initial-value: 75;
  }
  :root {
    --cta: rgb(94, 165, 0);
    --mouse-color: var(--cta);
		--first-word-color: var(--cta);
    --letter-spacing: 1ch;
    --f-size: clamp(1rem, 2.5vw + .045rem,  1.5rem);
  }

  body {
    height: 800svh;
    font-family: 'Noto Sans Mono', monospace;    
  }
  
  .scramble {
    --count: sibling-count();
    position: fixed;
    left: 50%;
    top: 50%;
    translate: -50% -50%;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    
		
		animation: --page-scroll 1s linear;
    animation-timeline: scroll(root block);
    animation-timing-function: steps(100);
    
    > * {
      perspective: 300px;
      transform-style: preserve-3d;
      margin: 0;
      display: flex;
      align-items: center;
      gap: 0;
      &:nth-child(2){
        color: var(--first-word-color);
      }
      > span {
        --i: sibling-index();
        --dir: calc(1 - 2 * mod(var(--i), 2));
        --rand: calc(mod((var(--i) * 7 + 20), 4) - 4);
        --wave: sin(calc(var(--i) * 17deg));
        
        /* y position */
        --start-y: calc(
          (var(--rand) + var(--wave) )
          * var(--dir)
          * var(--page-offset)
          * 1px
        );
        
        /* depth */
        --z: calc(abs(var(--rand) * 2 + var(--wave)));
        --depth-factor: calc(var(--page-offset) * 0.02);
        --start-z: calc(var(--z) * var(--depth-factor) * 13px);
      
        transform:
        translate3d(
          0,
          var(--start-y),
          var(--start-z)
        );
        
        display: inline-block;
        position: relative;
        font-size: var(--f-size);
      }
    }
  }
	
	@keyframes --page-scroll {
    to {
      --page-offset: 0;
    }
  }
}

/* the mouse icon is just to indicate scroll, it is not relevant to the demo */
@layer mouse{
  .mouse {
    pointer-events: none;
		position: fixed;
		bottom:10px;
		left: 50%;
    translate: -50% 0;
		display: block;
		width: 50px;
		height: 50px;
		opacity: 1;
    color:var(--mouse-color);
     display: none;
		animation-name: mouse;
		animation-duration: 1s;
		animation-timing-function: linear;
		animation-fill-mode: forwards;
		animation-timeline: scroll(root block);
    @supports  (animation-timeline: scroll()) {
      display: block;
    }
	}
	@keyframes mouse {
		95% {
			opacity: 1;
		}
		100% {
			opacity: 0;
		}
	}
}

 /* general styling not relevant for this demo */
@layer base {
	* {
		box-sizing: border-box;
	}
	:root {
		color-scheme: light dark;
		--bg-dark: rgb(12, 10, 9);
		--bg-light: rgb(248, 244, 238);
		--txt-light: rgb(10, 10, 10);
		--txt-dark: rgb(245, 245, 245););
		--line-light: rgba(0 0 0 / .25);
		--line-dark: rgba(255 255 255 / .25);
    
    --clr-bg: light-dark(var(--bg-light), var(--bg-dark));
    --clr-txt: light-dark(var(--txt-light), var(--txt-dark));
    --clr-lines: light-dark(var(--line-light), var(--line-dark));
	}
 
	body {
		background-color: var(--clr-bg);
		color: var(--clr-txt);
		min-height: 100svh;
		margin: 0;
		padding: 1rem;
		font-family: system-ui, sans-serif;
		font-size: 1rem;
		line-height: 1.5;
    display: grid;
    place-items: center;
    grid-template-rows: 1fr auto;
	}
	@supports not (animation-timeline: scroll()) {
	 body::before {
			content:"Sorry, your browser doesn't support animation-timeline";
			position: fixed;
			top: 2rem;
			left: 50%;
			translate: -50% 0;
			font-size: 0.8rem;
		}
	}
  footer a {
    font-size: .8rem;
    color: var(--cta);
    z-index: 2;
    underline: none;
    display: block;
    transition: scale 150ms ease-in-out;
    &:hover{
      scale: 1.12;
    }
    
  }
}