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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.hero {
  margin: 0;
  box-sizing: border-box;
  max-width: clamp(220px, 78vw, 360px);
  text-align: center;
  display: grid;
  gap: 8px;
}

.hero__line {
  display: block;
  font-weight: 800;
  font-size: clamp(18px, 6vw, 28px);
  line-height: 1.28;
  font-family: inherit;
  color: #fff7e6;
  letter-spacing: -0.01em;
  opacity: 0;
  transform: translateY(24px);
}

.hero__line--3 em {
  font-style: normal;
  color: #beab7c;
}

.stage.is-demo .hero__line--1 {
  animation: line-in-1 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .hero__line--2 {
  animation: line-in-2 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .hero__line--3 {
  animation: line-in-3 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes line-in-1 {
  0% {
    opacity: 0;
    transform: translateY(24px);
  }
  10% {
    opacity: 1;
    transform: translateY(0);
  }
  85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(24px);
  }
}
@keyframes line-in-2 {
  0%, 10% {
    opacity: 0;
    transform: translateY(24px);
  }
  20% {
    opacity: 1;
    transform: translateY(0);
  }
  85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(24px);
  }
}
@keyframes line-in-3 {
  0%, 20% {
    opacity: 0;
    transform: translateY(24px);
  }
  30% {
    opacity: 1;
    transform: translateY(0);
  }
  85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(24px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .hero__line--1,
  .stage.is-demo .hero__line--2,
  .stage.is-demo .hero__line--3 {
    animation: none;
    opacity: 1;
    transform: none;
  }
}