:root {
    /* Breakpoints */
    --mobile-width: 768px;
    
    /* Transitions */
    --transition-speed: 0.3s;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Theme Transitions */
    transition: background-color var(--transition-speed) var(--transition-ease),
                color var(--transition-speed) var(--transition-ease),
                border-color var(--transition-speed) var(--transition-ease),
                box-shadow var(--transition-speed) var(--transition-ease);
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 1rem;
    --space-4: 1.5rem;
    --space-5: 2rem;
    
    /* Typography */
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-base: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --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);

    /* Z-Index */
    --z-toast: 1000;

    /* Typography */
    --font-heading: var(--font-family-heading, system-ui);
    --font-body: var(--font-family-body, system-ui);
    
    /* Light Theme Colors */
    --color-background: #ffffff;
    --color-text: #1f2937;
    --color-surface: #f3f4f6;
    --color-border: #e5e7eb;
    --color-primary: #2563eb;
    --color-success: #22c55e;
    --color-error: #ef4444;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-background: #111827;
    --color-text: #f9fafb;
    --color-surface: #1f2937;
    --color-border: #374151;
    --color-primary: #3b82f6;
    --color-success: #22c55e;
    --color-error: #ef4444;

    /* Theme specific shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}