/* Shadow is not a decorative material. Exactly three are permitted: two
   separate an overlay from the page it covers, and one lifts the floating
   controls (17 Oct 2026). Nothing else casts one. */
:root{
  --os-shadow-none:none;
  --os-shadow-drawer:0 2px 4px rgba(14,22,20,0.05),0 8px 26px rgba(14,22,20,0.08);
  --os-shadow-sheet:0 -10px 30px rgba(14,22,20,0.10);
  --os-shadow-float:0 1px 2px rgba(14,22,20,0.06),0 8px 24px rgba(14,22,20,0.12);
  --os-glass-filter:blur(20px) saturate(1.5);
}