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);
}

.cta {
  position: relative;
  width: clamp(260px, 86vw, 400px);
  overflow: hidden;
  border-radius: 16px;
  background: #17141a;
  padding: clamp(20px, 5.6vw, 28px) clamp(16px, 5vw, 24px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(10px, 3vw, 14px);
}

.cta__glow {
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #2f6df6;
  filter: blur(2px);
  opacity: 0.3;
  animation: glowPulse 2s ease-out infinite;
}

.cta__title {
  position: relative;
  margin: 0;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 19px);
  line-height: 1.35;
  max-width: 80%;
}

.cta__btn {
  position: relative;
  border: 0;
  border-radius: 999px;
  background: #fff7e6;
  color: #17141a;
  padding: clamp(8px, 2.2vw, 10px) clamp(16px, 4vw, 20px);
  font-weight: 700;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1;
  animation: btnPulse 2s ease-out infinite;
}

@keyframes glowPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.25);
    opacity: 0.5;
  }
}
@keyframes btnPulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.06);
  }
}
@media (prefers-reduced-motion: reduce) {
  .cta__glow,
  .cta__btn {
    animation: none !important;
    transform: none;
  }
  .cta__glow {
    opacity: 0.3;
  }
}