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);
}

.btn {
  border: 0;
  border-radius: 12px;
  padding: 16px 32px;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  background: #fff7e6;
  cursor: pointer;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

@media (prefers-reduced-motion: no-preference) {
  .btn {
    transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }
  .btn:hover, .btn:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
  .btn:active {
    transform: translateY(-1px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: box-shadow 220ms linear;
  }
  .btn:hover, .btn:focus-visible {
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
}
@media (prefers-reduced-motion: no-preference) {
  .btn.is-demo {
    animation: lift-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  }
}

@keyframes lift-loop {
  0%, 25% {
    transform: translateY(0);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  50% {
    transform: translateY(-4px);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
  75%, 100% {
    transform: translateY(0);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
}