/* Essence — border radii + widths. */
:root{
  --radius-none:0px;
  --radius-sm:4px;   /* checkboxes, small tags */
  --radius-md:6px;   /* badges, filter chips */
  --radius-default:8px; /* buttons SM, nav items, pagination */
  --radius-lg:10px;  /* buttons MD, inputs, cards, toasts */
  --radius-xl:12px;  /* buttons LG, larger cards */
  --radius-2xl:16px; /* app frame, modal dialogs, vault cards */
  --radius-full:9999px;
  --border-w:1px;--border-w-2:2px;--border-w-3:3px; /* 3px = toast left border, focus ring */
}