:root{
/* spacing — 4px base */
--sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:24px;--sp-6:32px;--sp-7:48px;--sp-8:64px;--sp-9:96px;
/* radii — angular, gothic; nothing pillowy */
--radius-sm:2px;--radius-md:3px;--radius-lg:6px;--radius-round:999px;
/* borders */
--border-w:1px;--border-w-heavy:2px;--rule-double:3px double var(--rule);
/* shadows — hard etched drop + faint ambient, like inked plates */
--shadow-card:0 1px 0 rgba(0,0,0,.25),0 6px 18px -8px rgba(0,0,0,.55);--shadow-raised:0 2px 0 rgba(0,0,0,.3),0 14px 32px -12px rgba(0,0,0,.6);--shadow-hard:3px 3px 0 rgba(27,23,28,.85);--shadow-inset:inset 0 2px 6px rgba(0,0,0,.35);
/* motion — sombre, no bounce */
--ease-out:cubic-bezier(.2,.7,.3,1);
--dur-fast:120ms;
--dur-med:220ms;
--dur-slow:420ms;
}