html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.footer-a {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: clamp(260px, 88vw, 400px);
  border-radius: 16px;
  padding: 24px;
  background: #17141a;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.footer-a::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  mix-blend-mode: overlay;
  background-image: radial-gradient(rgba(255, 247, 230, 0.7) 0.6px, transparent 0.6px), radial-gradient(rgba(23, 20, 26, 0.7) 0.6px, transparent 0.6px);
  background-size: 3px 3px, 5px 5px;
  animation: grainJump 2s steps(6, jump-none) infinite;
}

.footer-a__col {
  position: relative;
  z-index: 1;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-a__label {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font: 700 clamp(9.5px, 2.2vw, 10.5px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-a__link {
  margin: 0;
  color: #ffffff;
  font-weight: 600;
  font-size: clamp(11px, 2.6vw, 12px);
  line-height: 1.4;
}

@keyframes grainJump {
  0% {
    background-position: 0 0, 0 0;
  }
  20% {
    background-position: -6px 4px, 3px -5px;
  }
  40% {
    background-position: 5px -3px, -4px 6px;
  }
  60% {
    background-position: -3px -6px, 6px 2px;
  }
  80% {
    background-position: 4px 5px, -5px -3px;
  }
  100% {
    background-position: 0 0, 0 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .footer-a::before {
    animation: none;
  }
}