/* ========================================
   Этап №0 — Декоративный фон: волны + эквалайзер
   ======================================== */

#etap0-viz-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 5;
  pointer-events: none;
  opacity: 0.3;
  transition: opacity 0.4s ease;
}

.md-main__inner {
  position: relative;
}

#etap0-viz-canvas.scrolled {
  opacity: 0.08;
}

@media (prefers-reduced-motion: reduce) {
  #etap0-viz-canvas {
    display: none;
  }
}