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 {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: clamp(240px, 86vw, 360px);
  background: #17141a;
  border-radius: 16px;
  padding: 24px;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer.is-demo .footer__col {
  animation-name: colRise;
}
.footer__col {
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.footer__col--1 {
  animation-delay: 0s;
}

.footer__col--2 {
  animation-delay: -1.5s;
}

.footer__col--3 {
  animation-delay: -1s;
}

.footer__col--4 {
  animation-delay: -0.5s;
}

.footer__head {
  margin: 0;
  color: #5b8cf8;
  font: 700 clamp(9px, 2.2vw, 10.5px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.footer__link {
  margin: 0;
  color: rgba(255, 247, 230, 0.7);
  font-weight: 600;
  font-size: clamp(10px, 2.4vw, 11.5px);
  line-height: 1.4;
}

@keyframes colRise {
  0%, 62%, 100% {
    opacity: 0.35;
    transform: translateY(4px);
  }
  17% {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .footer__col {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}