:root{
/* cool, navy-tinted shadows — never pure black, kept low-elevation */
--shadow-sm:0 1px 2px #3b3e9e;
--shadow-md:0 4px 12px #3b3e9e;
--shadow-lg:0 12px 32px #3b3e9e;
--shadow-focus:0 0 0 3px #3b3e9e;
}