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);
}

.bar {
  position: relative;
  width: clamp(180px, 60vw, 280px);
  height: 6px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.bar__fill {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: #2f6df6;
  transform-origin: left center;
  animation: sweep 1.5s ease-in-out infinite;
}

@keyframes sweep {
  0% {
    transform: translateX(-100%) scaleX(0.3);
  }
  50% {
    transform: translateX(20%) scaleX(0.6);
  }
  100% {
    transform: translateX(100%) scaleX(0.3);
  }
}
@media (prefers-reduced-motion: reduce) {
  .bar__fill {
    animation: none;
    transform: translateX(0) scaleX(0.55);
    opacity: 0.7;
  }
}