/* Tier 1 · shadow. Every shadow is tinted with Ocean Ink, never neutral black. */
:root{
--shadow-xs:0 1px 2px rgba(5,36,47,.06);
--shadow-sm:0 1px 3px rgba(5,36,47,.08),0 1px 2px rgba(5,36,47,.04);
--shadow-md:0 4px 12px rgba(5,36,47,.08),0 1px 3px rgba(5,36,47,.05);
--shadow-lg:0 12px 28px rgba(5,36,47,.10),0 2px 6px rgba(5,36,47,.06);
--shadow-xl:0 24px 56px rgba(5,36,47,.14);
--shadow-focus:0 0 0 3px rgba(0,112,184,.28);
--shadow-signal:0 0 0 4px rgba(0,220,224,.22);
}