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);
}

.lead {
  margin: 0;
  max-width: min(300px, 88vw);
  color: #fff7e6;
  text-align: center;
  font-weight: 700;
  font-size: clamp(18px, 5.2vw, 24px);
  line-height: 1.35;
  font-family: inherit;
  opacity: 0;
  transform: translateY(16px);
}

.lead.is-demo {
  animation: fade-slide-loop 2s ease-out infinite;
}

@keyframes fade-slide-loop {
  0% {
    opacity: 0;
    transform: translateY(16px);
  }
  22% {
    opacity: 1;
    transform: translateY(0);
  }
  82% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(16px);
  }
}
.lead.is-appear {
  animation: fade-slide 400ms ease-out both;
}

@keyframes fade-slide {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .lead.is-demo, .lead.is-appear {
    animation: none;
    opacity: 1;
    transform: none;
  }
}