:root{--z-base:1000;--z-modal:1100;--z-confirm-modal:1300;--z-overlay:1400;--z-dropdown:var(--z-base);--z-sticky:calc(var(--z-base) + 1);--z-modal-actions:calc(var(--z-modal) + 100);--z-notifications:calc(var(--z-base) + 200);--z-tooltip:calc(var(--z-base) + 300);--z-select:calc(var(--z-base) + 301);--touch-target-min-height:44px;--touch-target-min-width:44px;--loading-indicator-bg:rgba(255,255,255,0.9);--loading-indicator-shadow:rgba(0,0,0,0.1);--loading-overlay-bg:rgba(255,255,255,0.8);--tab-active-bg:rgba(126,0,222,0.2);--tab-active-color:#7E00DE}