.card {
  --holo-color: #00f0ff;
  --holo-bg: rgba(0, 240, 255, 0.05);
  
  position: relative;
  padding: 1.5rem;
  background: var(--holo-bg);
  border: 1px solid var(--holo-color);
  border-radius: 0.25rem;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--holo-color), transparent);
  animation: scan-line 3s linear infinite;
}

@keyframes scan-line {
  0% { top: 0; opacity: 1; }
  50% { opacity: 0.5; }
  100% { top: 100%; opacity: 1; }
}

/* Variants */
.cyan {
  --holo-color: #00f0ff;
  --holo-bg: rgba(0, 240, 255, 0.05);
}

.pink {
  --holo-color: #ff00ff;
  --holo-bg: rgba(255, 0, 255, 0.05);
}

.green {
  --holo-color: #00ff88;
  --holo-bg: rgba(0, 255, 136, 0.05);
}

.purple {
  --holo-color: #a855f7;
  --holo-bg: rgba(168, 85, 247, 0.05);
}

.content {
  position: relative;
  z-index: 2;
}

.scanlines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.1) 2px,
    rgba(0, 0, 0, 0.1) 4px
  );
  pointer-events: none;
  z-index: 3;
}

.glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--holo-bg) 0%, transparent 70%);
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}

.flicker {
  animation: hologram-flicker 4s infinite;
}

@keyframes hologram-flicker {
  0%, 100% { opacity: 1; }
  92% { opacity: 1; }
  93% { opacity: 0.8; }
  94% { opacity: 1; }
  95% { opacity: 0.9; }
  96% { opacity: 1; }
}

.card:hover {
  box-shadow: 
    0 0 20px var(--holo-color),
    inset 0 0 20px rgba(0, 240, 255, 0.1);
}