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);
}

.tiles {
  display: flex;
  gap: clamp(6px, 2vw, 10px);
}
.tiles span {
  width: clamp(30px, 8vw, 40px);
  height: clamp(30px, 8vw, 40px);
  border-radius: 12px;
  background: #2f6df6;
  animation: tile-loop 2s ease-out infinite;
  animation-delay: calc(sibling-index() * 100ms);
}

@keyframes tile-loop {
  0%, 6% {
    opacity: 0;
    transform: scale(0.5);
  }
  22%, 68% {
    opacity: 1;
    transform: scale(1);
  }
  88%, 100% {
    opacity: 0;
    transform: scale(0.7);
  }
}
@media (prefers-reduced-motion: reduce) {
  .tiles span {
    animation: none;
    opacity: 1;
    transform: none;
  }
}