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);
}

.card {
  position: relative;
  width: 220px;
  height: 140px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.thumb {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(47, 109, 246, 0.25), rgba(47, 109, 246, 0.08));
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(-45deg, rgba(23, 20, 26, 0.82) 0 16px, rgba(23, 20, 26, 0.62) 16px 32px);
  background-size: 64px 64px;
}

.stamp {
  padding: 8px 16px;
  border: 2px solid #fff;
  border-radius: 8px;
  color: #fff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.1em;
  transform: scale(1) rotate(-6deg);
}

.stage.is-demo .overlay {
  animation: stripes-flow 2s linear infinite;
}

.stage.is-demo .stamp {
  animation: stamp-breathe 2s ease-in-out infinite;
}

@keyframes stripes-flow {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 64px 0;
  }
}
@keyframes stamp-breathe {
  0%, 100% {
    transform: scale(1) rotate(-6deg);
  }
  50% {
    transform: scale(1.08) rotate(-6deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .overlay {
    animation: none;
  }
  .stage.is-demo .stamp {
    animation: none;
  }
}