function cabecera_nexfo_shortcode() 
{  return '
    <style>
    .header-nexfo-top { width: 100%; background-color: #ffffff; border-bottom: 1px solid #e0e0e0; padding: 12px 20px; box-sizing: border-box; font-family: Arial, sans-serif; }
    .header-nexfo-top .contenedor { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
    .header-nexfo-top .logo img { max-height: 50px; width: auto; display: block; }
    .header-nexfo-top .datos-contacto { display: flex; align-items: center; gap: 25px; flex-wrap: wrap; }
    .header-nexfo-top .item-contacto { display: flex; align-items: center; gap: 8px; }
    .header-nexfo-top .item-contacto .icono { font-size: 18px; }
    .header-nexfo-top .item-contacto .texto { display: flex; flex-direction: column; }
    .header-nexfo-top .item-contacto small { font-size: 10px; color: #666666; text-transform: uppercase; font-weight: bold; }
    .header-nexfo-top .item-contacto a, .header-nexfo-top .item-contacto span { font-size: 13px; color: #1a1a1a; font-weight: 600; text-decoration: none; }
    .header-nexfo-top .item-contacto a:hover { color: #0066cc; }
    @media (max-width: 768px) {
      .header-nexfo-top .contenedor { flex-direction: column; text-align: center; }
      .header-nexfo-top .datos-contacto { justify-content: center; gap: 12px; }
    }
    </style>
    <div class="header-nexfo-top">
      <div class="contenedor">
        <div class="logo">
          <a href="https://www.nexfoperu.com">
            <img src="https://www.nexfoperu.com/wp-content/uploads/2019/02/logo.png" alt="Nexfo Perú">
          </a>
        </div>
        <div class="datos-contacto">
          <div class="item-contacto">
            <span class="icono">✉️</span>
            <div class="texto">
              <small>Correo</small>
              <a href="mailto:ventas@nexfoperu.com">ventas@nexfoperu.com</a>
            </div>
          </div>
          <div class="item-contacto">
            <span class="icono">💬</span>
            <div class="texto">
              <small>WhatsApp</small>
              <a href="https://wa.me/51908809406" target="_blank">908 809 406</a>
            </div>
          </div>
          <div class="item-contacto">
            <span class="icono">📍</span>
            <div class="texto">
              <small>Dirección</small>
              <span>PJ. Diego Quispe Mza. Z-2 Lote. 23 Int Urb. Pando (Av Universitaria cuadra 4)</span>
            </div>
          </div>
        </div>
      </div>
    </div>';
}
add_shortcode('cabecera_nexfo', 'cabecera_nexfo_shortcode');

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.nexfoperu.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-footer-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-header-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-title_section-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-project-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-mailpoet_page-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-posts-tahefobu_header-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-taxonomies-project-category-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-taxonomies-project-tag-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://www.nexfoperu.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>