Holographic Card Effect

.holo-card {
  position: relative;
  width: 300px;
  height: 420px;
  border-radius: 16px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.holo-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255, 255, 255, 0.03) 2px,
    rgba(255, 255, 255, 0.03) 4px
  );
}

.holo-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    115deg,
    transparent 20%,
    rgba(255, 0, 255, 0.4) 36%,
    rgba(0, 255, 255, 0.4) 43%,
    rgba(0, 255, 0, 0.4) 50%,
    rgba(255, 255, 0, 0.4) 57%,
    rgba(255, 0, 0, 0.4) 64%,
    transparent 80%
  );
  background-size: 200% 100%;
  background-position: 200% 0;
  mix-blend-mode: color-dodge;
  opacity: 0;
  transition: opacity 0.3s, background-position 0.5s;
}

.holo-card:hover::after {
  opacity: 1;
  background-position: -200% 0;
  animation: holo-shimmer 2s linear infinite;
}

@keyframes holo-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.holo-card:hover {
  transform: scale(1.02) translateY(-5px);
  box-shadow: 
    0 0 40px rgba(255, 0, 255, 0.4),
    0 0 60px rgba(0, 255, 255, 0.3),
    0 20px 40px rgba(0, 0, 0, 0.4);
}

/* Sparkle effect */
.holo-sparkle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 0 10px white;
  animation: sparkle 1.5s ease-in-out infinite;
  opacity: 0;
}

@keyframes sparkle {
  0%, 100% { opacity: 0; transform: scale(0); }
  50% { opacity: 1; transform: scale(1); }
}