:root {
  --contrast: 1;
  --saturate: 0;
  --blur: 0;
  --hue: 0deg;
  --brightness: 1;
  --img-size: 500px;
  --controls-width: 480px;
  --top-offset: -60px;
  --img-from-top: calc(50vh + (var(--img-size) / 2) + var(--top-offset));
  --scroll-height: 60px;
  --ui-bg: #222;
  --ui-bg-transparent: #22222200;
  --buttons-row-height: 100px;
}

body {
  background-color: var(--ui-bg);
  font-family: sans-serif;
}

*::-webkit-scrollbar {
  display: none;
}

* {
  user-select: none;
}

body:has(input[name="mode"][value="contrast"]:checked) {
  .scroller[data-level="1"] {
    pointer-events: all;
  }
  
  .scroller[data-level="1"] .sizer[data-level="1"]::before {
    opacity: 1;
  }
  
  [data-mode="contrast"] {
    color: white;
  }
} 

body:has(input[name="mode"][value="saturation"]:checked) {
  .scroller[data-level="2"] {
    pointer-events: all;
  }
  .scroller[data-level="2"] .sizer[data-level="2"]::before {
    opacity: 1;
  }
  [data-mode="saturation"] {
    color: white;
  }
} 

body:has(input[name="mode"][value="brightness"]:checked) {
  .scroller[data-level="3"] {
    pointer-events: all;
  }
  .scroller[data-level="3"] .sizer[data-level="3"]::before {
    opacity: 1;
  }
  [data-mode="brightness"] {
    color: white;
  }
} 

body:has(input[name="mode"][value="blur"]:checked) {
  .scroller[data-level="4"] {
    pointer-events: all;
  }
  .scroller[data-level="4"] .sizer[data-level="4"]::before {
    opacity: 1;
  }
  [data-mode="blur"] {
    color: white;
  }
} 

body:has(input[name="mode"][value="hue"]:checked) {
  .scroller[data-level="5"] {
    pointer-events: all;
  }
  .scroller[data-level="5"] .sizer[data-level="5"]::before {
    opacity: 1;
  }
  [data-mode="hue"] {
    color: white;
  }
} 

.scroller {
  height: var(--scroll-height);
  width: var(--controls-width);
  overflow-x: scroll;
  scroll-timeline-axis: x;
  position: fixed;
  top: var(--img-from-top);
  left: 0;
  right: 0;
  margin: auto;
  pointer-events: none;
  overflow-y: visible;
}

.scroller-cover {
  position: absolute;
  top: calc(var(--img-from-top));
  pointer-events: none;
  height: var(--scroll-height);
  background-image: linear-gradient(to right, var(--ui-bg), var(--ui-bg-transparent) 30%, var(--ui-bg-transparent) 70%, var(--ui-bg));
  z-index: 3;
  content: '';
  left: 0;
  right: 0;
  margin: auto;
  width: var(--controls-width);
}

.scroller[data-level="1"] {
  scroll-timeline-name: --scroller-1;
}

.scroller[data-level="2"] {
  scroll-timeline-name: --scroller-2;
}

.scroller[data-level="3"] {
  scroll-timeline-name: --scroller-3;
}

.scroller[data-level="4"] {
  scroll-timeline-name: --scroller-4;
}

.scroller[data-level="5"] {
  scroll-timeline-name: --scroller-5;
}

.sizer {
  width: 200%;
  animation-duration: 1ms; 
  animation-direction: alternate;
  animation-timing-function: linear;
  overflow: visible;
}

.scroll-center {
  content: '';
  position: fixed;
  top: calc(var(--img-from-top) + var(--scroll-height) - 30px);
  height: 30px;
  width: 2px;
  background-color: #FF5D5D;
  left: -1px;
  right: 0;
  margin: auto;
  display: block;
  position: absolute;
  z-index: 9;
  pointer-events: none;
}

.sizer::before {
  content: '';
  position: absolute;
  left: 50%;
  margin: auto;
  opacity: 0;
  background-image: url("https://assets.codepen.io/215059/ticker-6_6.svg");
  background-size: 100% 16px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  height: 20px;
  width: 100%;
  bottom: 0;
  pointer-events: none;
}

.sizer[data-level="1"] {
  animation-name: contrastAnimation;
  animation-timeline: --scroller-1;
}

.sizer[data-level="2"] {
  animation-name: saturateAnimation;
  animation-timeline: --scroller-2;
}

.sizer[data-level="3"] {
  animation-name: brightnessAnimation;
  animation-timeline: --scroller-3;
}

.sizer[data-level="4"] {
  animation-name: blurAnimation;
  animation-timeline: --scroller-4;
}

.sizer[data-level="5"] {
  animation-name: hueAnimation;
  animation-timeline: --scroller-5;
}

#image {
  width: var(--img-size);
  height: var(--img-size);
  position: fixed;
  pointer-events: none;
  top: calc(var(--img-from-top) - var(--img-size));
  left: 0;
  right: 0;
  margin: auto;
  display: flex;
  background: var(--ui-bg);
  align-items: center;
  justify-content: center;
}

#image > div {
  object-fit: contain;
  width: 100%;
  height: 100%;
  margin: auto;
  overflow: hidden;
  text-align: center;
}

#image img {
  max-width: 100%;
  max-height: 100%;
  margin: auto;
  filter: contrast(var(--contrast)) saturate(var(--saturate)) brightness(var(--brightness))  blur(var(--blur)) hue-rotate(var(--hue));
}

.buttons {
  position: fixed;
  left: 0;
  right: 0;
  margin: auto;
  top: calc(var(--img-from-top) + var(--scroll-height));
  height: var(--buttons-row-height);
  width: var(--controls-width);
  z-index: 2;
  display: flex;
  justify-content: center;
  
}

.buttons > div {
  flex-basis: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: #949494;
  padding-top: 12px;
  position: relative;
  flex-direction: column;
}

.buttons > div input {
  appearance: none;
  opacity: 1;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: block;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.buttons > div .icon {
  width: 48px;
  height: 48px;
  background-color: #3B3B3B;
  border-radius: 50%;
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon svg {
  width: 24px;
}


@keyframes contrastAnimation {
  0% {
    --contrast: 0.3;
  }
  50% {
    --contrast: 1;
  }
  100% {
    --contrast: 2;
  }
}

@keyframes saturateAnimation {
  0% {
    --saturate: 0;
  }
  50% {
    --saturate: 1;
  }
  100% {
    --saturate: 10;
  }
}

@keyframes blurAnimation {
  0% {
    --blur: 0px;
  }
  100% {
    --blur: 30px;
  }
}

@keyframes hueAnimation {
  0% {
    --hue: 0deg;
  }
  100% {
    --hue: 360deg;
  }
}

@keyframes brightnessAnimation {
  0% {
    --brightness: 0;
  }
  50% {
    --brightness: 1;
  }
  100% {
    --brightness: 2;
  }
}


/* @property --contrast {
  syntax: "<number>";
  inherits: false;
  initial-value: 0;
}

@property --saturate {
  syntax: "<number>";
  inherits: false;
  initial-value: 0;
} */