<div class="warning">
  <p>⚠️ Scroll-driven animations are not supported in this browser. Try this demo in Chrome 115+.</p>
</div>

<figure class="component" aria-hidden="true" webc:root="override">
  <div class="timer-wrapper">
    <svg class="timer" xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentcolor" viewBox="0 0 256 256">
      <rect width="256" height="256" fill="none"></rect>
      <circle cx="128" cy="128" r="88" fill="var(--color-theme)"></circle>
      <circle cx="128" cy="128" r="88" fill="none" stroke="currentcolor" stroke-miterlimit="10" stroke-width="16"></circle>
      <line class="timer-hand" x1="128" y1="128" x2="167.6" y2="88.4" fill="none" stroke="currentcolor" stroke-linecap="round" stroke-linejoin="round" stroke-width="16"></line>
      <line class="timer-switch" x1="104" y1="8" x2="152" y2="8" fill="none" stroke="currentcolor" stroke-linecap="round" stroke-linejoin="round" stroke-width="16"></line>
    </svg>
  </div>
  <figcaption class="caption"></figcaption>
</figure>

:root {
  --color-bg: #fffefd;
  --color-text: #020617;
  --color-theme: #ffedd5;
  --color-theme-accent: #fed7aa;
}

@property --progress {
  syntax: "<integer>";
  initial-value: 0;
  inherits: false;
}

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

.component {
  --size: 30vmin;

  display: grid;
  grid-template-areas:
    "timer"
    "caption";
  place-items: center;
  place-content: center;
  gap: 0.2em;
  position: fixed;
  inset: 0;
  margin: auto;
}

.timer-wrapper {
  grid-area: timer;
  display: grid;
  place-items: center;
  place-content: center;
  grid-template-areas: "container";
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: conic-gradient(
    from 45deg,
    var(--color-theme-accent) calc(var(--progress) * 1%),
    transparent 0
  );
}

.timer-wrapper > * {
  grid-area: container;
}

.timer {
  width: calc(var(--size) / 1.2);
  height: calc(var(--size) / 1.2);
}

.caption {
  grid-area: caption;
}

.caption::before,
.caption::after {
  margin-inline: auto;
  content: counter(progress);
  font-size: calc(0.6em + var(--size) / 6);
  font-weight: bold;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.caption::after {
  content: "%";
}

/* Warning for unsupported browsers */
.warning {
  color: black;
  background: papayawhip;
  padding: 1rem;
  line-height: 1.3;
  text-align: center;
}

@supports (animation-timeline: scroll()) {
  .warning {
    display: none;
  }

  body {
    height: 1000vh;
  }

  :is(.component, .timer-wrapper, .timer, .timer-hand, .timer-switch) {
    animation-fill-mode: both;
    animation-timing-function: linear;
    animation-timeline: scroll();
  }

  .component {
    --plunge-offset: 10rem;
    --plunge-start: calc(100% - var(--plunge-offset) * 2);
    --plunge-end: calc(100% - var(--plunge-offset));

    animation-name: progress;
    animation-range: 0 var(--plunge-start);
    counter-reset: progress var(--progress);
  }

  .timer-wrapper {
    animation-name: progress, turn-upright;
    animation-range: 0 var(--plunge-start),
      var(--plunge-start) var(--plunge-end);
  }

  .timer {
    --plunge-depth: 0.25em;
    transform-origin: 50% 0;
    animation-name: plunge;
    animation-range: var(--plunge-start) var(--plunge-end);
  }

  .timer-switch {
    --plunge-depth: 1em;
    transform-origin: 50% 0;
    animation-name: plunge;
    animation-range: var(--plunge-start) var(--plunge-end);
  }

  .timer-hand {
    transform-origin: 50%;
    rotate: calc((var(--progress) / 100) * 360deg);
    animation-name: progress;
    animation-range: 0 var(--plunge-start);
  }

  @keyframes progress {
    to {
      --progress: 100;
    }
  }

  @keyframes turn-upright {
    from {
      rotate: -10deg;
    }
    to {
      rotate: 0;
    }
  }

  @keyframes plunge {
    50% {
      translate: 0 var(--plunge-depth);
    }
  }

  @keyframes fade-out {
    from {
      opacity: 1;
    }
    to {
      opacity: 0;
    }
  }
}