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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: #ff4d1f;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.06em;
  box-shadow: 0 0 8px rgba(255, 77, 31, 0.5);
}

.flame {
  color: #ffd23f;
  filter: brightness(1) hue-rotate(0deg);
}

.stage.is-demo .flame {
  animation: flicker 900ms ease-out infinite alternate;
}

.stage.is-demo .badge {
  animation: glow-pulse 1800ms ease-out infinite;
}

@keyframes flicker {
  0% {
    filter: brightness(1) hue-rotate(0deg);
    transform: scale(1) skewX(0deg);
  }
  18% {
    filter: brightness(1.25) hue-rotate(-6deg);
    transform: scale(1.05) skewX(-2deg);
  }
  40% {
    filter: brightness(0.92) hue-rotate(4deg);
    transform: scale(0.97) skewX(1deg);
  }
  63% {
    filter: brightness(1.15) hue-rotate(-3deg);
    transform: scale(1.03) skewX(-1deg);
  }
  81% {
    filter: brightness(0.97) hue-rotate(2deg);
    transform: scale(1) skewX(1deg);
  }
  100% {
    filter: brightness(1.2) hue-rotate(-5deg);
    transform: scale(1.04) skewX(-2deg);
  }
}
@keyframes glow-pulse {
  0%, 100% {
    box-shadow: 0 0 8px rgba(255, 77, 31, 0.5);
  }
  50% {
    box-shadow: 0 0 24px rgba(255, 77, 31, 0.85), 0 0 8px rgba(255, 210, 63, 0.5);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .flame {
    animation: none;
  }
  .stage.is-demo .badge {
    animation: none;
  }
}