@keyframes scanLine {
  0%   { top: 0%; }
  50%  { top: 95%; }
  100% { top: 0%; }
}
.scan-line {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #3b82f6, transparent);
  box-shadow: 0 0 8px 2px #3b82f680;
  animation: scanLine 2s linear infinite;
}
* { -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }