Guía: Cómo elegir la aguja correcta para inyecciones :root--bg:#f7f9fb;--card:#ffffff;--accent:#0b66c3;--muted:#555 bodyfont-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; background:var(--bg); color:#222; margin:0; padding:24px .containermax-width:980px;margin:0 auto headerbackground:li