/* ============================================================
   TDi · SPACING, RADIUS, ELEVATION, MOTION
   Sharp, precise, instrument-grade. Small radii, tight shadows.
   ============================================================ */
:root {
  /* Spacing — 4px base grid */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4 */
  --space-2: 0.5rem;   /* 8 */
  --space-3: 0.75rem;  /* 12 */
  --space-4: 1rem;     /* 16 */
  --space-5: 1.5rem;   /* 24 */
  --space-6: 2rem;     /* 32 */
  --space-7: 3rem;     /* 48 */
  --space-8: 4rem;     /* 64 */
  --space-9: 6rem;     /* 96 */

  /* Radius — minimal, technical. Square by default. */
  --radius-0: 0;
  --radius-xs: 2px;
  --radius-sm: 3px;
  --radius-md: 5px;
  --radius-lg: 8px;
  --radius-pill: 999px;

  /* Borders */
  --bw-hair: 1px; /* @kind spacing */
  --bw-1: 1.5px; /* @kind spacing */
  --bw-2: 2px; /* @kind spacing */

  /* Elevation — tight, cool, low-spread */
  --shadow-xs: 0 1px 2px rgba(12,20,25,0.06);
  --shadow-sm: 0 1px 3px rgba(12,20,25,0.10), 0 1px 2px rgba(12,20,25,0.06);
  --shadow-md: 0 4px 12px rgba(12,20,25,0.10), 0 2px 4px rgba(12,20,25,0.06);
  --shadow-lg: 0 12px 28px rgba(12,20,25,0.14), 0 4px 10px rgba(12,20,25,0.08);
  --shadow-accent: 0 4px 16px rgba(44,187,223,0.32);
  --shadow-inset: inset 0 1px 2px rgba(12,20,25,0.10);

  /* Motion — quick, mechanical, no bounce */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1); /* @kind other */
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1); /* @kind other */
  --dur-fast: 120ms; /* @kind other */
  --dur-base: 180ms; /* @kind other */
  --dur-slow: 280ms; /* @kind other */

  /* Layout */
  --container: 1200px; /* @kind spacing */
  --rail: 248px; /* @kind spacing */
}