:root {
    /* Colors - Light Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f0f2f5;
    --color-bg-glass: rgba(255, 255, 255, 0.72);
    --color-bg-glass-heavy: rgba(255, 255, 255, 0.88);
    
    --color-surface: rgba(255, 255, 255, 0.85);
    --color-surface-elevated: rgba(255, 255, 255, 0.95);
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-light: rgba(59, 130, 246, 0.1);
    
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-light: rgba(0, 0, 0, 0.04);
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 24px 0 rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px 0 rgba(0, 0, 0, 0.12);
    
    /* Glass Effects */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;
    --blur-xl: 40px;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    
    --text-xs: 11px;
    --text-sm: 13px;
    --text-base: 15px;
    --text-lg: 17px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 30px;
    
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    
    /* 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-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Layout */
    --safe-area-top: env(safe-area-inset-top);
    --safe-area-bottom: env(safe-area-inset-bottom);
    --safe-area-left: env(safe-area-inset-left);
    --safe-area-right: env(safe-area-inset-right);
    
    --nav-height: 72px;
    --header-height: 56px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-glass: rgba(20, 20, 20, 0.72);
    --color-bg-glass-heavy: rgba(20, 20, 20, 0.88);
    
    --color-surface: rgba(26, 26, 26, 0.85);
    --color-surface-elevated: rgba(30, 30, 30, 0.95);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1aa;
    --color-text-tertiary: #71717a;
    
    --color-accent: #60a5fa;
    --color-accent-hover: #3b82f6;
    --color-accent-light: rgba(96, 165, 250, 0.15);
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.04);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 24px 0 rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px 0 rgba(0, 0, 0, 0.6);
}