* {
  border: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:root {
  --hue: 223;
  --bg: hsl(var(--hue), 10%, 90%);
  --fg: hsl(var(--hue), 10%, 10%);
  font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body,
button {
  color: var(--fg);
  font: 1em/1.5 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
    Arial, sans-serif;
}
body {
  background-color: var(--bg);
  height: 100vh;
  display: grid;
  place-items: center;
}
.progress-clock {
  display: grid;
  justify-content: center;
  align-content: center;
  position: relative;
  text-align: center;
  width: 16em;
  height: 16em;
}
.progress-clock__time-date,
.progress-clock__time-digit,
.progress-clock__time-colon,
.progress-clock__time-ampm {
  transition: color 0.2s linear;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}
.progress-clock__time-date,
.progress-clock__time-digit {
  background: transparent;
}
.progress-clock__time-date,
.progress-clock__time-ampm {
  grid-column: 1 / 6;
}
.progress-clock__time-date {
  font-size: 0.75em;
  line-height: 1.33;
}
.progress-clock__time-digit,
.progress-clock__time-colon {
  font-size: 2em;
  font-weight: 400;
  grid-row: 2;
}
.progress-clock__time-colon {
  line-height: 1.275;
}
.progress-clock__time-ampm {
  cursor: default;
  grid-row: 3;
}
.progress-clock__rings {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
.progress-clock__ring {
  opacity: 0.1;
}
.progress-clock__ring-fill {
  transition: opacity 0s 0.3s linear, stroke-dashoffset 0.3s ease-in-out;
}
.progress-clock__ring-fill--360 {
  opacity: 0;
  stroke-dashoffset: 0;
  transition-duration: 0.3s;
}
[data-group]:focus {
  outline: transparent;
}
[data-units] {
  transition: opacity 0.2s linear;
}
[data-group='d']:focus,
[data-group='d']:hover {
  color: hsl(333, 90%, 55%);
}
[data-group='h']:focus,
[data-group='h']:hover {
  color: hsl(33, 90%, 55%);
}
[data-group='m']:focus,
[data-group='m']:hover {
  color: hsl(213, 90%, 55%);
}
[data-group='s']:focus,
[data-group='s']:hover {
  color: hsl(273, 90%, 55%);
}
[data-group]:focus ~ .progress-clock__rings [data-units],
[data-group]:hover ~ .progress-clock__rings [data-units] {
  opacity: 0.2;
}
[data-group='d']:focus ~ .progress-clock__rings [data-units='d'],
[data-group='d']:hover ~ .progress-clock__rings [data-units='d'],
[data-group='h']:focus ~ .progress-clock__rings [data-units='h'],
[data-group='h']:hover ~ .progress-clock__rings [data-units='h'],
[data-group='m']:focus ~ .progress-clock__rings [data-units='m'],
[data-group='m']:hover ~ .progress-clock__rings [data-units='m'],
[data-group='s']:focus ~ .progress-clock__rings [data-units='s'],
[data-group='s']:hover ~ .progress-clock__rings [data-units='s'] {
  opacity: 1;
}
/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: hsl(var(--hue), 10%, 10%);
    --fg: hsl(var(--hue), 10%, 90%);
  }
  .progress-clock__ring {
    opacity: 0.2;
  }
}