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);
}

.cta {
  box-sizing: border-box;
  border: 0;
  cursor: pointer;
  padding: 16px 32px;
  border-radius: 999px;
  background: #fff7e6;
  color: #c93000;
  font-weight: 800;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 0 0 0 rgba(255, 224, 102, 0);
  transition: transform 220ms ease-out;
}

.cta:hover {
  transform: translateY(-2px);
}

.cta:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.stage.is-demo .cta {
  animation: pulse 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 224, 102, 0.55);
  }
  50% {
    transform: scale(1.045);
    box-shadow: 0 0 32px 8px rgba(255, 224, 102, 0.55);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 224, 102, 0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .cta {
    animation: none;
    box-shadow: 0 0 24px 4px rgba(255, 224, 102, 0.35);
  }
}