:root{
/* Corners are square. The only radius in the system is the pill on a status dot. */
--radius-none:0;
--radius-pill:999px;

--border-hairline:1px solid var(--rule-hairline);
--border-card:1px solid var(--rule-card);
--border-strong:1px solid var(--rule-strong);
--border-inverse:1px solid var(--rule-on-inverse);

/* One shadow only, and only for lifted paper (index cards, overlays). */
--shadow-paper:0 6px 18px rgba(35,31,26,.18);
--shadow-overlay:0 18px 48px rgba(28,26,23,.24);
}