/* ==========================================================================
   digHy — Radii, spacing, shadows, gradients, transitions
   ========================================================================== */
:root {
  /* ----- Corner radii ----- */
  --radius: 0.5rem;        /* 8 — base (cards, buttons, inputs) */
  --radius-sm: 0.25rem;    /* 4 */
  --radius-md: 0.375rem;   /* 6 */
  --radius-lg: 0.5rem;     /* 8 */
  --radius-xl: 0.75rem;    /* 12 — sidebar nav, dropdowns */
  --radius-pill: 9999px;   /* badges */

  /* ----- Spacing scale (Tailwind 4px base) ----- */
  --space-1: 0.25rem;  /* 4 */
  --space-2: 0.5rem;   /* 8 */
  --space-3: 0.75rem;  /* 12 */
  --space-4: 1rem;     /* 16 */
  --space-5: 1.25rem;  /* 20 */
  --space-6: 1.5rem;   /* 24 */
  --space-8: 2rem;     /* 32 */
  --space-12: 3rem;    /* 48 */

  /* ----- Shadows (dark UI — shadows are darker than the surface) ----- */
  --shadow-elegant: 0 2px 12px rgba(0, 0, 0, 0.8);   /* dropdowns / modals */
  --shadow-lift: 0 10px 40px rgba(0, 0, 0, 0.8);     /* lifted surfaces, hover */
  --shadow-input: 0 4px 16px rgba(0, 0, 0, 0.4);     /* inputs */
  --shadow-glow: 0 0 20px hsl(var(--primary) / 0.3); /* green emphasis glow */

  /* ----- Gradients (used sparingly) ----- */
  --gradient-primary: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--primary-glow)));
  --gradient-dark: linear-gradient(180deg, hsl(var(--background)), hsl(0 0% 5%));
  --gradient-card: linear-gradient(to bottom, hsl(var(--card)), hsl(var(--card) / 0.75));
  --gradient-rule: linear-gradient(to right, hsl(var(--primary) / 0.6), hsl(var(--primary)), hsl(var(--primary) / 0.6));

  /* ----- Transitions ----- */
  --transition-smooth: all 0.2s ease-out;        /* @kind other */
  --transition-button: background-color 0.5s ease, color 0.3s ease;  /* @kind other */
}