:root{
  /* Core primitives (rarely changed directly) */
  --rt-black:#000;
  --rt-white:#fff;

  /* Radii scale */
  --rt-radius-1:6px;
  --rt-radius-2:10px;
  --rt-radius-3:14px;
  --rt-radius-4:18px;
  --rt-radius-pill:999px;

  /* Shadow alpha is set by Customizer */
  --rt-shadow-alpha:35;

  /* Motion */
  --rt-ease-out:cubic-bezier(.2,.9,.2,1);
  --rt-fast:150ms var(--rt-ease-out);
  --rt-med:240ms var(--rt-ease-out);
  --rt-slow:360ms var(--rt-ease-out);

  /* Density baselines (overridden by density classes) */
  --rt-gap:14px;
  --rt-section-pad:24px;
  --rt-container-pad:16px;
  --rt-grid-gap:14px;
}