/* Animated network background — fixed behind all page content.
   Sections that set their own background color (var(--bg-2), etc.)
   will naturally cover it; it shows through in sections that don't. */
#neural-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  display: block;
  pointer-events: none;
  background: var(--bg);
}