:root{--bg:#ffffff;--fg:#1a1a1a;--muted:#6b6b6b;--border:#e5e5e5;--accent:#2f6fed}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6}main{max-width:640px;margin:0 auto;padding:3rem 1.25rem}a{color:var(--accent)}