:root{--bg:#f7f8fa;--surface:#fff;--text:#152033;--muted:#637086;--line:#dfe4eb;--accent:#315dff;--accent-dark:#244ad7;--code:#f4f6fa;--error:#bf2d38;color-scheme:light}:root[data-theme=dark]{--bg:#0d111a;--surface:#151b27;--text:#edf2fa;--muted:#9ba8bc;--line:#2b3546;--accent:#8ba5ff;--accent-dark:#afc0ff;--code:#0b1019;--error:#ff9ca4;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.55}.shell{width:min(1120px,calc(100% - 48px));margin:0 auto}.site-header{height:68px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 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