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 {
  padding: clamp(8px, 4vw, 24px);
}

.cta-a {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: clamp(260px, 90vw, 420px);
  border-radius: 16px;
  padding: 32px 24px;
  background: linear-gradient(120deg, #17141a, #2f6df6, #ff4d1f, #ffd23f, #17141a);
  background-size: 300% 100%;
  animation: flow 2s linear infinite;
}

.cta-a::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  mix-blend-mode: overlay;
  background-image: radial-gradient(rgba(255, 255, 255, 0.6) 0.5px, transparent 0.5px), radial-gradient(rgba(23, 20, 26, 0.6) 0.5px, transparent 0.5px);
  background-size: 3px 3px, 5px 5px;
}

.cta-a__title {
  position: relative;
  z-index: 1;
  margin: 0 0 16px;
  color: #ffffff;
  font: 700 clamp(16px, 4vw, 20px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.cta-a__btn {
  position: relative;
  z-index: 1;
  border: 0;
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  padding: 8px 24px;
  font-weight: 700;
  font-size: clamp(11px, 2.6vw, 13px);
  line-height: 1;
}

@keyframes flow {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cta-a {
    animation: none;
    background-position: 0% 50%;
  }
}