{% if page %}
{% set page_section = get_section(path=page.ancestors[1], metadata_only = true) %}
{% endif %}
<nav>
  <menu>
    <li><a {% if section and section == root %} class="nav_current" {% endif %} href="/">Home</a></li>
    {% for subsection in root.subsections %}
    {% set subsection = get_section(path=subsection, metadata_only=true) %}
    <li><a href="{{ subsection.permalink }}" {% if section and section.title == subsection.title or page and page_section.title == subsection.title %} class="nav_current" {% endif %}>{{ subsection.title }}</a></li>
    {% endfor %}
  </menu>
</nav>