body {
  margin: 0;
  height: 100vh;
  background: #121212;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
}

.scene {
  width: 300px;
  height: 300px;
  perspective: 1000px;
}

.card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.8s ease;
  cursor: pointer;
}

.card.gedreht {
  transform: rotateY(180deg);
}

.card > div {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: white;
  padding: 20px;
  text-align: center;
}

.front {
  background: linear-gradient(135deg, #2196f3, #00bcd4);
  overflow: hidden;
  position: relative;
}

.back {
  background: #2e2e2e;
  transform: rotateY(180deg);
}

.shine {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
  transform: rotate(25deg);
  animation: shineAnim 3s infinite;
}

@keyframes shineAnim {
  0% { transform: translateX(-100%) rotate(25deg); }
  100% { transform: translateX(100%) rotate(25deg); }
}