Scan Line

<!-- Scan Line -->
<figure class="nuda-scan">
  <img class="nuda-scan__img" src="/your-image.jpg" alt="" />
  <span class="nuda-scan__line"></span>
  <span class="nuda-scan__grid"></span>
</figure>

/* Scan Line
   CRT-style overlay: faint scanlines + a sweeping highlight bar.
   Customize: --scan-color, --scan-duration */

.nuda-scan {
  --scan-color: #e4ff54;
  --scan-duration: 2.6s;
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  overflow: hidden;
  margin: 0;
}

.nuda-scan__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.3) contrast(1.1);
}

.nuda-scan__grid {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.18) 0 2px,
    transparent 2px 4px
  );
  pointer-events: none;
  opacity: 0.6;
}

.nuda-scan__line {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 22px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(228, 255, 84, 0.4),
    transparent
  );
  box-shadow: 0 0 16px rgba(228, 255, 84, 0.5);
  pointer-events: none;
  animation: nuda-scan-line var(--scan-duration) linear infinite;
}

@keyframes nuda-scan-line {
  0%   { transform: translateY(-22px); }
  100% { transform: translateY(calc(100% + 22px)); }
}

@media (prefers-reduced-motion: reduce) {
  .nuda-scan__line { animation: none; opacity: 0; }
}