/* Interactive page background.

   The canvas sits at z-index -1, which paints *before* the backgrounds of
   in-flow blocks — so body must not carry the page fill or it would bury the
   field. html keeps it instead (see head.html). */

#bg-field {
    position: fixed;
    inset: 0;
    z-index: -1;
    display: block;
    pointer-events: none;
}

@media print {
    #bg-field { display: none; }
}