:root {
    /* Color Variables */
    --color-primary: #0070F3;
    --color-primary-light: #3291FF;
    --color-primary-dark: #0050B3;
    
    --color-secondary: #00BFA5;
    --color-secondary-light: #33CFBA;
    --color-secondary-dark: #008E76;
    
    --color-accent: #6C63FF;
    --color-accent-light: #8C85FF;
    --color-accent-dark: #4A42F0;
    
    --color-success: #10B981;
    --color-success-light: #34D399;
    --color-success-dark: #059669;
    
    --color-warning: #F59E0B;
    --color-warning-light: #FBBF24;
    --color-warning-dark: #D97706;
    
    --color-error: #EF4444;
    --color-error-light: #F87171;
    --color-error-dark: #DC2626;
    
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Light Theme Colors */
    --color-background: var(--color-gray-50);
    --color-surface: #FFFFFF;
    --color-text: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-border: var(--color-gray-200);
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Font Variables */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    
    /* Font Sizes */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-md: 1rem;        /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    
    /* Font Weights */
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-body: 1.5;     /* 150% */
    --line-height-heading: 1.2;  /* 120% */
    
    /* Spacing Variables (8px system) */
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */
    
    /* Border Radius */
    --border-radius-sm: 0.25rem;  /* 4px */
    --border-radius-md: 0.5rem;   /* 8px */
    --border-radius-lg: 0.75rem;  /* 12px */
    --border-radius-xl: 1rem;     /* 16px */
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    
    /* Z-Index Layers */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
  }
  
  /* Dark Theme Variables */
  [data-theme="dark"] {
    --color-background: var(--color-gray-900);
    --color-surface: var(--color-gray-800);
    --color-text: var(--color-gray-50);
    --color-text-secondary: var(--color-gray-400);
    --color-border: var(--color-gray-700);
    --color-shadow: rgba(0, 0, 0, 0.3);
    
    /* Adjust some colors for dark mode */
    --color-primary-light: #0070F3;
    --color-primary: #3291FF;
    
    --color-secondary-light: #00BFA5;
    --color-secondary: #33CFBA;
    
    --color-accent-light: #6C63FF;
    --color-accent: #8C85FF;
  }