/* Actuator Security | Alpha-inspired ambient backdrop | 2026-10-25 | Mobile visibility update
   An atmospheric visual inspired by 8-12 Hz EEG alpha waves, NOT a flashing
   light stimulus. On-screen translation remains deliberately slow.
   Desktop opacity defaults to .56; mobile boosted to .90.
   Override --alpha-wave-opacity on body to adjust strength.
*/
body { isolation: isolate; }
#alpha-wave-backdrop {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: var(--alpha-wave-opacity, .56);
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  mix-blend-mode: screen;
}
/* Direct page elements are composited above the noninteractive canvas.
   Do not change .site-header's sticky position (z-index:50 in site.css). */
body > main,
body > footer,
body > .site-footer,
body > [data-include] {
  position: relative;
  z-index: 1;
}
/* On narrow viewports the lines need more presence: stronger compositing,
   while remaining translucent and behind the page content. */
@media (max-width: 640px) {
  body { --alpha-wave-opacity: .90; }
}
@media (prefers-reduced-motion: reduce), (forced-colors: active) {
  #alpha-wave-backdrop { opacity: .27; }
}
@media print { #alpha-wave-backdrop { display: none !important; } }