:root{--bg:#fff;--fg:#1a1a1a;--muted:#6b6b6b;--rule:#e5e5e5;--link:#1967d2;--link-hover:#0b4aa0;--code-bg:#f4f4f6;--code-border:#e5e5e5;--accent:#111}:root[data-theme=dark]{--bg:#0f0f11;--fg:#e8e8e8;--muted:#8a8a8a;--rule:#26262b;--link:#6ab0ff;--link-hover:#9ecaff;--code-bg:#1a1a1e;--code-border:#2a2a2f;--accent:#fff}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}.container{max-width:720px;margin:0 auto;padding:28px 24px 96px}.topbar{display:flex;justify-content:flex-end;align-items:center;padding:4px 0 36px}.theme-toggle{display:inline-flex;align-items:center;gap:8px;border:0;background:transparent;padding:4px 0;cursor:pointer;color:var(--muted)}.theme-toggle:hover{color:var(--fg)}.theme-toggle 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