:root{
--radius-none:0;
--radius-xs:2px;
--radius-sm:4px;      /* KPI blocks, inputs, buttons */
--radius-md:6px;
--radius-lg:10px;     /* programme cards */
--radius-pill:999px;  /* area tags, numbered circles */
--radius-circle:50%;
--border-width:1px;
--border-width-thick:3px;
--rule-accent:4px;    /* lima rule under section titles */
}