:root{
/* Maximum-contrast brand: zoning is done with flat colour and hairlines, not shadow.
   Two shadows exist, both for genuinely floating layers. */
--gh-shadow-none:none;
--gh-shadow-raised:0 1px 2px rgba(43,53,38,.06),0 2px 8px rgba(43,53,38,.06);
--gh-shadow-overlay:0 8px 32px rgba(43,53,38,.16);
--gh-border-hairline:1px;--gh-border-heavy:2px;
}