:root {
  /* A1 — Colour System */
  --violet-600: #7C3AED;
  --violet-700: #6D28D9;
  --violet-50: #F5F3FF;
  --violet-100: #EDE9FE;

  --slate-950: #0F172A;
  --slate-800: #1E293B;
  --slate-700: #334155;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --slate-50: #F8FAFC;

  --green-600: #16A34A;
  --red-600: #DC2626;
  --amber-600: #D97706;
  --blue-600: #2563EB;

  /* A2 — Typography */
  --font-display: 48px;
  --font-h1: 36px;
  --font-h2: 24px;
  --font-h3: 18px;
  --font-body-lg: 16px;
  --font-body: 14px;
  --font-label: 12px;
  --font-caption: 11px;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  --leading-tight: 1.15;
  --leading-normal: 1.65;
  --leading-relaxed: 1.75;

  /* A3 — Spacing (8px grid) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  /* A4 — Component Design Tokens */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  --shadow-card: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 4px 16px rgba(0,0,0,0.12), 0 8px 24px rgba(0,0,0,0.06);
  --shadow-modal: 0 20px 60px rgba(0,0,0,0.2);
  --shadow-focus: 0 0 0 3px rgba(124,58,237,0.18);

  --transition-default: all 0.15s ease;
  --transition-layout: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}