:root {
    /* Colors - OKLCH */
    --color-primary: oklch(45% 0.2 250);
    --color-primary-light: oklch(55% 0.18 250);
    --color-primary-dark: oklch(35% 0.22 250);
    --color-primary-bg: oklch(95% 0.02 250);
    
    --color-secondary: oklch(55% 0.15 45);
    --color-secondary-light: oklch(65% 0.12 45);
    
    --color-success: oklch(55% 0.18 145);
    --color-success-bg: oklch(95% 0.05 145);
    --color-warning: oklch(70% 0.15 85);
    --color-warning-bg: oklch(95% 0.05 85);
    --color-error: oklch(55% 0.2 25);
    --color-error-bg: oklch(95% 0.05 25);
    --color-info: oklch(55% 0.15 230);
    --color-info-bg: oklch(95% 0.03 230);
    
    /* Neutrals */
    --color-text: oklch(20% 0.02 250);
    --color-text-muted: oklch(45% 0.02 250);
    --color-text-light: oklch(60% 0.01 250);
    --color-bg: oklch(99% 0.005 250);
    --color-bg-alt: oklch(96% 0.01 250);
    --color-bg-elevated: oklch(100% 0 0);
    --color-border: oklch(88% 0.01 250);
    --color-border-light: oklch(92% 0.005 250);
    
    /* Spacing */
    --space-2xs: 0.25rem;
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
    --text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.875rem);
    --text-base: clamp(0.875rem, 0.8rem + 0.4vw, 1rem);
    --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --text-xl: clamp(1.125rem, 1rem + 0.6vw, 1.25rem);
    --text-2xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --text-3xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
    --text-4xl: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
    
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    
    /* Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px oklch(0% 0 0 / 0.1), 0 2px 4px -2px oklch(0% 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px oklch(0% 0 0 / 0.1), 0 4px 6px -4px oklch(0% 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px oklch(0% 0 0 / 0.1), 0 8px 10px -6px oklch(0% 0 0 / 0.1);
    
    /* Transitions */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
    --container-max: 1280px;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-toast: 400;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-text: oklch(95% 0.01 250);
        --color-text-muted: oklch(70% 0.02 250);
        --color-text-light: oklch(55% 0.01 250);
        --color-bg: oklch(12% 0.02 250);
        --color-bg-alt: oklch(16% 0.02 250);
        --color-bg-elevated: oklch(20% 0.02 250);
        --color-border: oklch(28% 0.02 250);
        --color-border-light: oklch(24% 0.01 250);
        
        --color-primary-bg: oklch(20% 0.05 250);
        --color-success-bg: oklch(20% 0.05 145);
        --color-warning-bg: oklch(20% 0.05 85);
        --color-error-bg: oklch(20% 0.05 25);
        --color-info-bg: oklch(20% 0.03 230);
    }
}

[data-theme="dark"] {
    --color-text: oklch(95% 0.01 250);
    --color-text-muted: oklch(70% 0.02 250);
    --color-text-light: oklch(55% 0.01 250);
    --color-bg: oklch(12% 0.02 250);
    --color-bg-alt: oklch(16% 0.02 250);
    --color-bg-elevated: oklch(20% 0.02 250);
    --color-border: oklch(28% 0.02 250);
    --color-border-light: oklch(24% 0.01 250);
}