OKLCH Pad

<div class="nuda-cpk2-oklch-pad">
  <div class="nuda-cpk2-oklch-pad__pad" aria-hidden="true">
    <span class="nuda-cpk2-oklch-pad__handle" role="slider" tabindex="0"
          aria-label="Lightness and chroma" aria-valuemin="0" aria-valuemax="100"
          aria-valuenow="63" aria-valuetext="Lightness 63%, chroma 0.19"
          style="transform:translate(120px,30px)"></span>
  </div>
  <div class="nuda-cpk2-oklch-pad__rail">
    <label id="cpk2-oklch-pad-hue-label" for="cpk2-oklch-pad-hue">Hue</label>
    <input id="cpk2-oklch-pad-hue" class="nuda-cpk2-oklch-pad__hue" type="range"
           min="0" max="360" value="292" aria-labelledby="cpk2-oklch-pad-hue-label"
           aria-valuetext="Hue 292 degrees, violet">
  </div>
  <div class="nuda-cpk2-oklch-pad__readout" aria-live="polite">oklch(63% 0.19 292)</div>
</div>

.nuda-cpk2-oklch-pad {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 12px;
  width: 100%;
  max-width: 240px;
}

.nuda-cpk2-oklch-pad__pad {
  position: relative;
  height: 120px;
  border-radius: 8px;
  background: linear-gradient(to top,#000,transparent),linear-gradient(to right,#8f8f97,#9d6dff);
  cursor: crosshair;
}

@supports (color:oklch(50% 0.1 180)) {
  .nuda-cpk2-oklch-pad__pad {
    background: linear-gradient(to top,#000,transparent),linear-gradient(to right,#8f8f97,oklch(63% 0.19 292));
  }
}

.nuda-cpk2-oklch-pad__handle {
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  margin: -8px;
  border-radius: 50%;
  border: 2px solid #fafafa;
  box-shadow: 0 0 0 1px rgba(0,0,0,.5),0 2px 6px rgba(0,0,0,.5);
  cursor: grab;
  transition: transform .18s cubic-bezier(.16,1,.3,1);
}

.nuda-cpk2-oklch-pad__handle:hover {
  transform: translate(120px,30px) scale(1.15);
}

.nuda-cpk2-oklch-pad__handle:focus-visible {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

.nuda-cpk2-oklch-pad__rail {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nuda-cpk2-oklch-pad__rail label {
  font-size: 10px;
  color: #777;
  width: 24px;
}

.nuda-cpk2-oklch-pad__hue {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 44px;
  background: transparent;
  cursor: pointer;
}

.nuda-cpk2-oklch-pad__hue::-webkit-slider-runnable-track {
  height: 10px;
  border-radius: 99px;
  background: linear-gradient(90deg,#ff5e7a,#ffb45e,#e4ff54,#6ee7b7,#62b6ff,#9d6dff,#ff6dd4,#ff5e7a);
}

.nuda-cpk2-oklch-pad__hue::-moz-range-track {
  height: 10px;
  border-radius: 99px;
  background: linear-gradient(90deg,#ff5e7a,#ffb45e,#e4ff54,#6ee7b7,#62b6ff,#9d6dff,#ff6dd4,#ff5e7a);
}

.nuda-cpk2-oklch-pad__hue::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -4px;
  border-radius: 50%;
  background: #fafafa;
  border: 2px solid #0c0c10;
  box-shadow: 0 0 0 1px rgba(255,255,255,.4);
  cursor: grab;
  transition: transform .2s;
}

.nuda-cpk2-oklch-pad__hue::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.nuda-cpk2-oklch-pad__hue::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fafafa;
  border: 2px solid #0c0c10;
  cursor: grab;
}

.nuda-cpk2-oklch-pad__hue:focus-visible {
  outline: none;
}

.nuda-cpk2-oklch-pad__hue:focus-visible::-webkit-slider-thumb {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

.nuda-cpk2-oklch-pad__readout {
  font-family: ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size: 11px;
  color: #fafafa;
  font-weight: 600;
  text-align: center;
  padding: 6px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 6px;
}

@media (prefers-reduced-motion:reduce) {
  .nuda-cpk2-oklch-pad__handle,.nuda-cpk2-oklch-pad__hue::-webkit-slider-thumb {
    transition: none;
  }
}