:root{
  /* Radii — architectural & restrained */
  --r-xs:2px; --r-sm:4px; --r-md:6px; --r-lg:10px; --r-xl:16px; --r-pill:999px;

  /* Borders */
  --bw-hair:1px; --bw-med:1.5px;

  /* Shadows — cool, low, quiet. Tinted to alpine night, never black. */
  --shadow-xs:0 1px 2px rgba(18,22,29,.06);
  --shadow-sm:0 2px 6px rgba(18,22,29,.07),0 1px 2px rgba(18,22,29,.05);
  --shadow-md:0 8px 24px rgba(18,22,29,.09),0 2px 6px rgba(18,22,29,.05);
  --shadow-lg:0 20px 50px rgba(18,22,29,.14),0 6px 14px rgba(18,22,29,.06);
  --shadow-ember:0 6px 22px rgba(200,122,46,.30);

  /* Motion — quiet, no bounce. */
  --ease-out:cubic-bezier(.22,.61,.36,1);      /* @kind other */
  --ease-in-out:cubic-bezier(.45,0,.2,1);      /* @kind other */
  --dur-fast:140ms; /* @kind other */
  --dur-med:240ms;  /* @kind other */
  --dur-slow:420ms; /* @kind other */
}