:root{
  /* 4px base spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  /* Corner radii — thirdbase is largely square/geometric (the mark is a diamond);
     radii are restrained. */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* Borders */
  --border-width: 1px; /* @kind other */

  /* Shadows — soft, low, neutral. thirdbase leans on flat fills + hairlines,
     shadows are subtle. */
  --shadow-sm: 0 1px 2px rgba(17,17,17,0.05);
  --shadow-md: 0 4px 16px rgba(17,17,17,0.08);
  --shadow-lg: 0 12px 40px rgba(17,17,17,0.10);

  /* Layout */
  --container-max: 1200px; /* @kind spacing */
  --slide-w: 1280px; /* @kind spacing */
  --slide-h: 720px; /* @kind spacing */

  /* Motion */
  --ease-standard: cubic-bezier(0.22, 0.61, 0.36, 1); /* @kind other */
  --dur-fast: 120ms; /* @kind other */
  --dur-base: 200ms; /* @kind other */
  --dur-slow: 360ms; /* @kind other */
}