:root{
/* The mark is built from perfect circles; brand tiles use a generous squircle corner. */
--radius-xs:4px;
--radius-sm:6px;
--radius-md:10px;
--radius-lg:14px;
--radius-xl:20px;
--radius-tile:22%;     /* brand-tile squircle, proportional */
--radius-pill:999px;
--radius-circle:50%;

--border-width-hairline:1px;
--border-width-thick:2px;
--border-width-rule:4px;   /* pattern-derived heavy rule */
}