:root {
  /* === COLORS === */
  /* Primary - Forest Green (Swiss precision) */
  --color-primary: #2e7d32;
  --color-primary-light: #66bb6a;
  --color-primary-dark: #1b5e20;
  
  /* Neutrals - Refined gray scale */
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #eeeeee;
  --color-gray-300: #e0e0e0;
  --color-gray-400: #bdbdbd;
  --color-gray-500: #9e9e9e;
  --color-gray-600: #757575;
  --color-gray-700: #616161;
  --color-gray-800: #424242;
  --color-gray-900: #212121;
  --color-black: #000000;
  
  /* Semantic colors */
  --color-success: #2e7d32;
  --color-warning: #f57c00;
  --color-error: #c62828;
  --color-info: #1976d2;
  
  /* === SPACING (8px base grid) === */
  --space-0: 0;
  --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 */
  --space-24: 6rem;    /* 96px */
  
  /* === TYPOGRAPHY === */
  /* Font families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, 'Liberation Mono', monospace;
  
  /* Type scale - Refined Swiss hierarchy */
  --text-2xs: 0.625rem;   /* 10px - Fine print */
  --text-xs: 0.75rem;     /* 12px - Captions, labels */
  --text-sm: 0.875rem;    /* 14px - Secondary text */
  --text-base: 1rem;      /* 16px - Body text */
  --text-lg: 1.125rem;    /* 18px - Large body */
  --text-xl: 1.25rem;     /* 20px - Small heading */
  --text-2xl: 1.5rem;     /* 24px - Section heading */
  --text-3xl: 2rem;       /* 32px - Page heading */
  --text-4xl: 2.5rem;     /* 40px - Hero heading */
  --text-5xl: 3rem;       /* 48px - Display heading */
  
  /* Font weights - Using Inter's optical weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Line heights - Swiss precision */
  --leading-tight: 1.2;     /* Headings */
  --leading-snug: 1.4;      /* Subheadings */
  --leading-normal: 1.5;    /* Body text */
  --leading-relaxed: 1.625; /* Readable paragraphs */
  --leading-loose: 1.75;    /* Spacious text */
  
  /* Letter spacing - Optimized for Inter */
  --tracking-tighter: -0.04em;  /* Large headings */
  --tracking-tight: -0.02em;    /* Medium headings */
  --tracking-normal: -0.011em;  /* Body text (Inter's optimal) */
  --tracking-wide: 0.02em;      /* Small caps, labels */
  --tracking-wider: 0.04em;     /* Spaced headings */
  
  /* === BORDERS & RADIUS === */
  --border-width: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  
  --border-radius-none: 0;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-2xl: 24px;
  --border-radius-full: 9999px;
  
  /* === SHADOWS === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  
  /* === TRANSITIONS === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Easing functions */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* === Z-INDEX LAYERS === */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1010;
  --z-fixed: 1020;
  --z-modal-backdrop: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}