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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.holo-card {
  --mx: 50%;
  --my: 35%;
  --rx: 0deg;
  --ry: 0deg;
  position: relative;
  width: min(128px, 40vw);
  aspect-ratio: 4/5;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(155deg, #2f6df6 0%, #17141a 100%);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  outline: none;
  cursor: pointer;
  transform: perspective(700px) rotateX(var(--rx)) rotateY(var(--ry));
  transition: transform 220ms ease-out, box-shadow 220ms ease-out;
}

.holo-card__shine {
  position: absolute;
  inset: -20%;
  background: conic-gradient(from 0deg, #dcb9d1, #b9d9dc, #c8dcb9, #dcdab9, #dcb9d1);
  background-size: 240% 240%;
  background-position: var(--mx) var(--my);
  mix-blend-mode: color-dodge;
  opacity: 0.55;
  pointer-events: none;
  transition: opacity 220ms ease-out, background-position 220ms ease-out;
}

.holo-card__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  background: linear-gradient(0deg, rgba(23, 20, 26, 0.78), rgba(23, 20, 26, 0));
}

.holo-card__badge {
  display: inline-block;
  padding: 4px 8px;
  margin-bottom: 8px;
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  font-weight: 700;
  font-size: 10px;
  font-family: inherit;
}

.holo-card__title {
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(13px, 4vw, 15px);
  line-height: 1.3;
  font-family: inherit;
}

.holo-card:hover,
.holo-card:focus-visible {
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.holo-card:hover .holo-card__shine,
.holo-card:focus-visible .holo-card__shine {
  opacity: 0.85;
}

.holo-card.is-demo {
  animation: tilt-loop 2s ease-out infinite;
}

.holo-card.is-demo .holo-card__shine {
  animation: shine-loop 2s ease-out infinite;
}

@keyframes tilt-loop {
  0%, 10% {
    transform: perspective(700px) rotateX(0deg) rotateY(0deg);
  }
  35% {
    transform: perspective(700px) rotateX(-10deg) rotateY(12deg);
  }
  65% {
    transform: perspective(700px) rotateX(8deg) rotateY(-10deg);
  }
  90%, 100% {
    transform: perspective(700px) rotateX(0deg) rotateY(0deg);
  }
}
@keyframes shine-loop {
  0%, 10% {
    background-position: 50% 50%;
    opacity: 0.55;
  }
  35% {
    background-position: 15% 20%;
    opacity: 0.9;
  }
  65% {
    background-position: 85% 80%;
    opacity: 0.9;
  }
  90%, 100% {
    background-position: 50% 50%;
    opacity: 0.55;
  }
}
@media (hover: none) {
  .holo-card:active {
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  .holo-card:active .holo-card__shine {
    opacity: 0.85;
  }
}
@media (prefers-reduced-motion: reduce) {
  .holo-card {
    transition: none;
  }
  .holo-card__shine {
    transition: none;
    opacity: 0.7;
  }
  .holo-card.is-demo,
  .holo-card.is-demo .holo-card__shine {
    animation: none;
  }
}