:root {
  /* ===== COULEURS ===== */
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-bg-muted: #f1f5f9;

  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-faint: #94a3b8;

  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #dbeafe;

  --color-success: #10b981;
  --color-success-soft: #d1fae5;

  --color-warning: #f59e0b;
  --color-warning-soft: #fef3c7;

  --color-danger: #ef4444;
  --color-danger-soft: #fee2e2;

  --color-info: #3b82f6;
  --color-info-soft: #dbeafe;

  /* ===== TYPOGRAPHIE ===== */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;

  --fs-xs: 0.75rem;     /* 12 */
  --fs-sm: 0.875rem;    /* 14 */
  --fs-base: 1rem;      /* 16 */
  --fs-md: 1.125rem;    /* 18 */
  --fs-lg: 1.25rem;     /* 20 */
  --fs-xl: 1.5rem;      /* 24 */
  --fs-2xl: 1.875rem;   /* 30 */
  --fs-3xl: 2.25rem;    /* 36 */

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

  --lh-tight: 1.25;
  --lh-base: 1.5;
  --lh-relaxed: 1.75;

  /* ===== ESPACEMENTS ===== */
  --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-10: 2.5rem;   /* 40 */
  --space-12: 3rem;     /* 48 */
  --space-16: 4rem;     /* 64 */

  /* ===== RADIUS ===== */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* ===== OMBRES ===== */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 20px 40px rgba(15, 23, 42, 0.12);

  /* ===== LAYOUT ===== */
  --sidebar-width: 240px;
  --header-height: 60px;
  --content-max: 1280px;

  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}