/* Highlight section headers in the left navigation bar */
.md-nav__item--section > .md-nav__link {
    color: #2196f3 !important;
    font-weight: bold;
}

/* Also target the top-level labels if they aren't technically "sections" in the DOM yet but act as them */
.md-nav--primary > .md-nav__list > .md-nav__item > .md-nav__link {
    color: #2196f3;
    font-weight: bold;
}