/* Red científica con profundidad; el contenido conserva el primer plano. */
.science-background {
  --science-x: 0px;
  --science-y: 0px;
  --science-pointer-x: 50vw;
  --science-pointer-y: 40vh;
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  color: var(--color-science-700);
  pointer-events: none;
  user-select: none;
  contain: strict;
}

.science-background__wash {
  position: absolute;
  inset: -2rem;
}

.science-background__wash {
  background:
    radial-gradient(ellipse at 95% 20%, var(--orb-color-1), transparent 55%),
    radial-gradient(ellipse at 10% 80%, var(--orb-color-2), transparent 50%);
}

.science-network,
.science-network-fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.science-network-fallback { opacity: 0.26; }
.science-network { visibility: hidden; }
.science-background[data-renderer='canvas'] .science-network { visibility: visible; }
.science-background[data-renderer='canvas'] .science-network-fallback { visibility: hidden; }

.science-background__halo {
  position: absolute;
  top: 0;
  left: 0;
  width: 36rem;
  height: 36rem;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--color-brand-400) 22%, transparent), transparent 66%);
  transform: translate3d(calc(var(--science-pointer-x) - 50%), calc(var(--science-pointer-y) - 50%), 0);
  opacity: 0;
  transition: opacity 350ms ease;
}

.science-background[data-pointer-active='true'] .science-background__halo {
  opacity: 1;
}

/* La veladura evita que las líneas compitan con títulos y párrafos. */
.home-hero,
.page-hero {
  background:
    linear-gradient(100deg, color-mix(in srgb, var(--color-surface) 76%, transparent) 8%, color-mix(in srgb, var(--color-surface) 38%, transparent) 48%, transparent 85%),
    radial-gradient(ellipse at 88% 18%, var(--orb-color-1), transparent 65%);
}

.science-toggle {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: var(--target-size);
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  color: var(--color-link);
  background: var(--color-surface-raised);
  box-shadow: var(--shadow-xs);
  font-size: var(--font-size-xs);
  font-weight: 650;
}

.science-toggle svg { width: 1rem; height: 1rem; }
.science-toggle:hover { border-color: var(--color-link); }
.science-toggle[aria-pressed='false'] { color: var(--color-muted); }
body.menu-open .science-toggle { visibility: hidden; }

@media (max-width: 47.999rem) {
  .science-network, .science-network-fallback { opacity: 0.65; }
}

@media (hover: none), (pointer: coarse) {
  .science-background__halo { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .science-background__halo,
  .science-toggle { display: none !important; }
}

@media print {
  .science-background,
  .science-toggle { display: none !important; }
}