html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.page {
  box-sizing: border-box;
  width: min(300px, 88vw);
}

.page__label {
  margin: 0 0 16px;
  color: #17141a;
  font-weight: 600;
  font-size: clamp(13px, 3.6vw, 15px);
  line-height: 1.4;
  font-family: inherit;
}

.track {
  height: 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.track__fill {
  height: 100%;
  border-radius: inherit;
  background: #2f6df6;
  transform-origin: left center;
  transform: scaleX(0);
}

.track__fill.is-demo {
  animation: fill-loop 2000ms linear infinite;
}

@keyframes fill-loop {
  0% {
    transform: scaleX(0);
  }
  90% {
    transform: scaleX(1);
  }
  100% {
    transform: scaleX(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .track__fill.is-demo {
    animation: none;
    transform: scaleX(1);
  }
}