@property --scan-position {
  syntax: "<percentage>";
  inherits: true;
  initial-value: 14%;
}

.visual-simulation {
  --scan-position: 14%;
  overflow: hidden;
  animation: before-after-scan 7s ease-in-out infinite;
}

.before-after-frame {
  position: absolute;
  inset: 0;
}

.before-after-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.before-after-after {
  -webkit-mask-image: linear-gradient(
    to bottom,
    #000 0,
    #000 calc(var(--scan-position) - 2%),
    transparent calc(var(--scan-position) + 2%),
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    #000 0,
    #000 calc(var(--scan-position) - 2%),
    transparent calc(var(--scan-position) + 2%),
    transparent 100%
  );
}

.before-after-label {
  position: absolute;
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, .35);
  background: rgba(3, 9, 12, .72);
  color: #f2f4f3;
  font: 10px/1 monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.before-after-before .before-after-label {
  right: 24px;
  bottom: 136px;
}

.before-after-after .before-after-label {
  top: 24px;
  left: 24px;
  color: var(--cyan);
  border-color: rgba(96, 229, 243, .5);
}

.visual-simulation .visual-scan {
  top: var(--scan-position);
  z-index: 1;
  height: 2px;
  transform: translateY(-50%);
  animation: none;
  box-shadow: 0 0 12px var(--cyan), 0 0 32px rgba(96, 229, 243, .55);
}

.visual-simulation .visual-scan::before {
  content: "";
  position: absolute;
  inset: -15px 0;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(96, 229, 243, .08) 42%,
    rgba(96, 229, 243, .23) 50%,
    rgba(96, 229, 243, .08) 58%,
    transparent
  );
}

@keyframes before-after-scan {
  0%, 100% { --scan-position: 14%; }
  50% { --scan-position: 84%; }
}

@media (max-width: 600px) {
  .before-after-before .before-after-label { right: 16px; bottom: 110px; }
  .before-after-after .before-after-label { top: 16px; left: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .visual-simulation { --scan-position: 50%; }
}