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, 2.4vw, 16px);
}

.card {
  width: min(150px, 48vw);
  aspect-ratio: 4/3;
  perspective: 800px;
  outline: none;
  cursor: pointer;
  border-radius: 16px;
}

.card__flip {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
  border-radius: 16px;
}

.card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 16px;
  padding: 12px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card__face--front {
  background: #ffffff;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.card__face--back {
  background: #2f6df6;
  transform: rotateY(180deg);
  color: #ffffff;
}

.card__title {
  margin: 0 0 4px;
  font-weight: 700;
  font-size: clamp(11px, 3.2vw, 13px);
  line-height: 1.3;
  font-family: inherit;
  color: #17141a;
}

.card__meta {
  margin: 0;
  font-weight: 500;
  font-size: clamp(10px, 2.8vw, 11px);
  line-height: 1.3;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.65);
}

.card__back-text {
  margin: 0;
  font-weight: 600;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1.5;
  font-family: inherit;
}

.card:hover .card__flip,
.card:focus-visible .card__flip,
.card:active .card__flip {
  transform: rotateY(180deg);
}

.card.is-demo .card__flip {
  animation: flip-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes flip-loop {
  0%, 20% {
    transform: rotateY(0);
  }
  50%, 75% {
    transform: rotateY(180deg);
  }
  100% {
    transform: rotateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .card__flip {
    transition: none;
  }
  .card.is-demo .card__flip {
    animation: none;
    transform: none;
  }
}