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);
}

.orb {
  position: relative;
  width: clamp(56px, 16vw, 84px);
  height: clamp(56px, 16vw, 84px);
}

.orb::before {
  content: "";
  position: absolute;
  inset: -30%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 109, 246, 0.55), transparent 70%);
  filter: blur(6px);
  animation: glow 2s ease-in-out infinite;
}

.orb::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff7e6, #2f6df6 75%);
  animation: core 2s ease-in-out infinite;
}

@keyframes core {
  0%, 100% {
    transform: scale(0.88);
    opacity: 0.88;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}
@keyframes glow {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.35;
  }
  50% {
    transform: scale(1.25);
    opacity: 0.65;
  }
}
@media (prefers-reduced-motion: reduce) {
  .orb::before, .orb::after {
    animation: none;
    transform: scale(1);
    opacity: 0.75;
  }
}