/* Fond PCB pleine page — traces + arcs électriques */

.page {

  position: relative;

  flex: 1 0 auto;

  display: flex;

  flex-direction: column;

  width: 100%;

}



.circuit-bg {

  position: absolute;

  inset: 0;

  z-index: 0;

  pointer-events: none;

  overflow: hidden;

}



.circuit-bg__svg {

  display: block;

  width: 100%;

  height: 100%;

  min-height: 100%;

  opacity: 1;

}



.circuit-base {

  fill: none;

  stroke: rgba(56, 189, 248, 0.22);

  stroke-width: 1.2;

  stroke-linecap: round;

  stroke-linejoin: round;

}



.circuit-pad {

  fill: rgba(56, 189, 248, 0.22);

  stroke: rgba(124, 138, 255, 0.35);

  stroke-width: 0.75;

}



/* Un arc à la fois — trajet complet, intensité modérée */

.circuit-arc {

  fill: none;

  stroke: rgba(56, 189, 248, 0.5);

  stroke-width: 2;

  stroke-linecap: round;

  stroke-linejoin: round;

  stroke-dasharray: 1;

  stroke-dashoffset: 1;

  opacity: 0;

  animation: arcTravel var(--arc-cycle, 84s) linear infinite;

  animation-delay: var(--arc-delay, 0s);

  filter: drop-shadow(0 0 2px rgba(56, 189, 248, 0.3));

}



@keyframes arcTravel {

  0% { stroke-dashoffset: 1; opacity: 0; }

  0.4% { opacity: 0.42; }

  3.2% { stroke-dashoffset: 0; opacity: 0.42; }

  3.6% { opacity: 0; }

  100% { stroke-dashoffset: 0; opacity: 0; }

}



@media (prefers-reduced-motion: reduce) {

  .circuit-arc {

    animation: none;

    opacity: 0;

  }

}