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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.hero {
  box-sizing: border-box;
  max-width: clamp(220px, 78vw, 360px);
  text-align: center;
  display: grid;
  gap: 12px;
}

.hero__title {
  margin: 0;
  color: #fff7e6;
  font-weight: 800;
  font-size: clamp(20px, 6vw, 28px);
  line-height: 1.25;
  font-family: inherit;
}

.hero__sub {
  margin: 0;
  color: #17141a;
  font-weight: 500;
  font-size: clamp(12px, 3.4vw, 13px);
  line-height: 1.5;
  font-family: inherit;
}

.stage.is-demo .hero {
  animation: recede 2s ease-out infinite;
  transform-origin: center top;
}

@keyframes recede {
  0% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  55% {
    opacity: 0.15;
    transform: scale(0.85) translateY(-40px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .hero {
    animation: none;
    opacity: 1;
    transform: none;
  }
}