/* =========================================
   CLIENTSIDETOOLS DESIGN TOKENS
   ========================================= */

:root {
  /* --- Typography --- */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Roboto Mono", monospace;

  /* Font Sizes (Major Third Scale) */
  --fs-xs: 0.75rem;   /* 12px */
  --fs-sm: 0.875rem;  /* 14px */
  --fs-base: 1rem;    /* 16px */
  --fs-md: 1.125rem;  /* 18px */
  --fs-lg: 1.25rem;   /* 20px */
  --fs-xl: 1.5rem;    /* 24px */
  --fs-2xl: 1.875rem; /* 30px */
  --fs-3xl: 2.25rem;  /* 36px */
  --fs-4xl: 3rem;     /* 48px */

  /* Line Heights */
  --lh-tight: 1.25;
  --lh-snug: 1.375;
  --lh-normal: 1.5;
  --lh-relaxed: 1.625;

  /* Font Weights */
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* --- Spacing Scale (4px base) --- */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */

  /* --- Border Radius --- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* --- Layout --- */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;

  /* --- Z-Index --- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;

  /* --- Motion --- */
  --transition-fast: 150ms ease-out;
  --transition-base: 250ms ease-out;
  --transition-slow: 400ms ease-out;
}

/* Responsive Typography Adjustments */
@media (max-width: 768px) {
  :root {
    --fs-4xl: 2.25rem;
    --fs-3xl: 1.875rem;
    --fs-2xl: 1.5rem;
  }
}