:root{
/* 6px base step. 30px is the grid gutter — the constant of the layout system. */
--space-xs:6px;
--space-sm:12px;
--space-md:18px;
--space-lg:24px;
--space-xl:30px;
--space-2xl:48px;
--space-3xl:60px;
--touch-min:48px;   /* minimum touch target */
--brand-min:100px;  /* minimum logo / certification seal width */
}