:root {
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --primary-light: #DBEAFE;
    
    --success: #10B981;
    --success-light: #D1FAE5;
    
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    
    --danger: #EF4444;
    --danger-light: #FEE2E2;
    
    --background: #FFFFFF;
    --surface: #F3F4F6;
    --surface-hover: #E5E7EB;
    
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    
    --border: #E5E7EB;
    --border-focus: #3B82F6;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    --priority-urgent: #DC2626;
    --priority-high: #EA580C;
    --priority-medium: #D97706;
    --priority-low: #6B7280;
    
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-notification: 2000;
}

[data-theme="dark"] {
    --primary: #60A5FA;
    --primary-hover: #3B82F6;
    --primary-light: #1E3A8A;
    
    --success: #34D399;
    --success-light: #064E3B;
    
    --warning: #FBBF24;
    --warning-light: #78350F;
    
    --danger: #F87171;
    --danger-light: #7F1D1D;
    
    --background: #1F2937;
    --surface: #374151;
    --surface-hover: #4B5563;
    
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    
    --border: #4B5563;
    --border-focus: #60A5FA;
}