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);
}

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

.spot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120px;
  height: 120px;
  margin: -60px 0 0 -60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 109, 246, 0.55), transparent 70%);
  filter: blur(6px);
  pointer-events: none;
}

.spot.is-demo {
  animation: orbit 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes orbit {
  0% {
    transform: translate(-90px, -40px);
  }
  25% {
    transform: translate(90px, -50px);
  }
  50% {
    transform: translate(70px, 60px);
  }
  75% {
    transform: translate(-80px, 55px);
  }
  100% {
    transform: translate(-90px, -40px);
  }
}
.hint {
  position: relative;
  margin: 0;
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  font: 700 clamp(14px, 4vw, 18px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .spot.is-demo {
    animation: none;
    transform: translate(-90px, -40px);
  }
}