/* ============================================================
   Sigma Squared — Spacing, Radius & Shadow Tokens
   Depth is created with SHADOW, never borders. Cards have no
   outline — they float on soft shadow over light backgrounds.
   ============================================================ */
:root {
  /* Spacing scale */
  --s2-space-xs: 4px;
  --s2-space-sm: 8px;
  --s2-space-md: 12px;
  --s2-space-lg: 16px;
  --s2-space-xl: 24px;
  --s2-space-2xl: 32px;
  --s2-space-3xl: 48px;
  --s2-space-4xl: 64px;

  /* Corner radii */
  --s2-radius-sm: 8px;    /* small buttons, inputs */
  --s2-radius-md: 10px;   /* buttons, inputs, tabs */
  --s2-radius-lg: 16px;   /* spec cards, swatches */
  --s2-radius-xl: 20px;   /* primary cards, panels */
  --s2-radius-pill: 999px;/* badges, pills */

  /* Shadow system (no borders) */
  --s2-shadow-sm: 0 2px 12px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.04);
  --s2-shadow-md: 0 8px 32px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.06);
  --s2-shadow-lg: 0 16px 56px rgba(0,0,0,0.13), 0 4px 16px rgba(0,0,0,0.07);
  --s2-shadow-xl: 0 24px 80px rgba(0,0,0,0.16), 0 8px 24px rgba(0,0,0,0.08);
  --s2-shadow-indigo: 0 4px 16px rgba(58,58,232,0.35); /* brand-button glow */

  /* Focus ring (inset-free, layered over shadow) */
  --s2-ring-focus: 0 0 0 2px var(--s2-indigo);
  --s2-ring-error: 0 0 0 2px var(--s2-error);

  /* Motion */
  --s2-ease: cubic-bezier(0.4, 0, 0.2, 1); /* @kind other */
  --s2-dur-fast: 0.15s; /* @kind other */
  --s2-dur: 0.3s; /* @kind other */
}