:root{
/* Soft, modern corners — depth comes from shadow and whitespace, not ruled boxes. */
--radius-sm:6px;
--radius-md:10px;  /* default: buttons, cards, inputs, chips */
--radius-lg:16px;  /* panels */
--radius-full:9999px; /* state dots only */
--state-bar:4px;   /* the colour bar across the top of a room card */
}