:root{
/* Flat system — borders over shadows; shadows only for floating layers */
--shadow-none:none;
--shadow-pop:0 8px 24px rgba(18,17,18,0.10);
--shadow-modal:0 24px 64px rgba(18,17,18,0.22);
--ease-out:cubic-bezier(0.22,1,0.36,1);
--ease-inout:cubic-bezier(0.65,0,0.35,1);
--dur-fast:120ms;
--dur-med:220ms;
--dur-slow:400ms;
--hover-lift:translateY(-2px);
}