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);
}

.cg-btn {
  position: relative;
  border: 0;
  border-radius: 999px;
  padding: 16px 32px;
  background: #0a4fe8;
  color: #fff7e6;
  font: 700 15px/1 -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
}

.cg-btn::before {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(10, 79, 232, 0.9), transparent 65%);
  filter: blur(3px);
  opacity: 0.2;
  transform: scale(1);
}

.cg-btn::before {
  animation: cg-pulse 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes cg-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.2;
  }
  50% {
    transform: scale(1.45);
    opacity: 0.95;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cg-btn::before {
    animation: none !important;
    opacity: 0.2 !important;
    transform: scale(1) !important;
  }
}