:root{
  /* 4px base scale */
  --space-0:0;
  --space-1:4px;
  --space-2:8px;
  --space-3:12px;
  --space-4:16px;
  --space-5:20px;
  --space-6:24px;
  --space-8:32px;
  --space-10:40px;
  --space-12:48px;
  --space-16:64px;
  --space-20:80px;
  --space-24:96px;

  /* Radii — restrained, institutional */
  --radius-sm:3px;
  --radius-md:6px;
  --radius-lg:10px;
  --radius-pill:999px;

  /* Borders */
  --border-width:1px;

  /* Shadows — soft, low, cool grey */
  --shadow-xs:0 1px 2px rgba(60,60,59,0.06);
  --shadow-sm:0 1px 3px rgba(60,60,59,0.08),0 1px 2px rgba(60,60,59,0.05);
  --shadow-md:0 4px 12px rgba(60,60,59,0.10);
  --shadow-lg:0 12px 32px rgba(60,60,59,0.14);

  /* Layout */
  --container-max:1180px;
  --container-narrow:720px;
  --focus-ring:0 0 0 3px rgba(153,194,30,0.35);
}