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);
}

.stage {
  position: relative;
  overflow: hidden;
}

.aurora {
  position: absolute;
  width: 38%;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(3px);
  opacity: 1;
}

.a1 {
  background: radial-gradient(#fff7e6 0%, #fff7e6 25%, transparent 55%);
  top: -8%;
  left: 8%;
  animation: spin1 2s linear infinite;
}

.a2 {
  background: radial-gradient(#17141a 0%, #17141a 25%, transparent 55%);
  bottom: -12%;
  right: 4%;
  animation: spin2 2s linear infinite;
  animation-delay: -1s;
}

.a3 {
  background: radial-gradient(#2f6df6 0%, #2f6df6 25%, transparent 55%);
  top: 22%;
  right: 28%;
  animation: spin3 2s linear infinite;
  animation-delay: -0.5s;
}

@keyframes spin1 {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(56px, 38px) rotate(180deg);
  }
  100% {
    transform: translate(0, 0) rotate(360deg);
  }
}
@keyframes spin2 {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-50px, -30px) rotate(-160deg);
  }
  100% {
    transform: translate(0, 0) rotate(-360deg);
  }
}
@keyframes spin3 {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(36px, -48px) rotate(150deg);
  }
  100% {
    transform: translate(0, 0) rotate(300deg);
  }
}
.hint {
  position: relative;
  margin: 0;
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.3);
  color: #ffffff;
  font: 700 clamp(14px, 4vw, 18px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .aurora {
    animation: none;
  }
}