@property --num-to-display {
  inherits: false;
  initial-value: 0;
  syntax: '<integer>';
}

html, body {
  min-height: 100svh;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.survey-progress {
  --tick-size: 50px;
}

.survey-ticks {
  position: relative;
  height: var(--tick-size);
  margin: 50px 75px;
  --minor-tick-background: #d1d1d1;
  --ticks-count: 7;
}

.survey-ticks::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  top: 50%;
  translate: 0 -50%;
  height: 2px;
  background: var(--minor-tick-background);
}

.survey-ticks > * {
  position: absolute;
  top: 50%;
  left: calc(100% * var(--tick-pos) / (var(--ticks-count) - 1));
  translate: -50% -50%;
  background: var(--minor-tick-background);
  width: var(--tick-size);
  height: var(--tick-size);
  border-radius: var(--tick-size);
}

.survey-ticks > .survey-current {
  --tick-size: 75px;
  background: #737373;
  overflow: clip;
  view-transition-name: survey-current;
}

@keyframes progress-counter {
  from {
    --num-to-display: calc((var(--from-step, var(--step)) - 1) / (var(--ticks-count) - 1) * 100);
  }
  to {
    --num-to-display: calc((var(--step) - 1) / (var(--ticks-count) - 1) * 100);
  }
}

.survey-current-nums {
  height: 100%;
  font-size: 2rem;
  color: #fff;
  position: absolute;
  inset: 0;
  display: grid;
  text-align: center;
  align-content: center;
  counter-reset: yo var(--num-to-display);
  animation: progress-counter 500ms both ease;
}

.survey-current-nums::before {
  content: counter(yo);
}

::view-transition-group(*) {
  animation-duration: 500ms;
}

::view-transition-old(survey-current) {
  display: none;
}

::view-transition-new(survey-current) {
  animation: none;
}