:root {
    /* Colors */
    --color-bg: #0F172A;
    --color-bg-secondary: #1E293B;
    --color-bg-tertiary: #334155;
    --color-text: #E2E8F0;
    --color-text-muted: #94A3B8;
    --color-text-dim: #64748B;
    --color-accent: #22C55E;
    --color-accent-hover: #16A34A;
    --color-accent-light: rgba(34, 197, 94, 0.1);
    --color-ratings: #F59E0B;
    --color-border: #334155;
    --color-border-light: #1E293B;
    --color-danger: #EF4444;
    --color-link: #22C55E;
    --color-link-hover: #4ADE80;
    --color-code-bg: #1E293B;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    --leading-tight: 1.25;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Layout */
    --container-max: 1200px;
    --content-max: 720px;
    --toc-width: 220px;
    --header-height: 64px;
    --sidebar-gap: 48px;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index */
    --z-toc: 10;
    --z-header: 100;
    --z-overlay: 200;
    --z-modal: 300;
}