.usa-header {

@if variable-exists(header-bg) {
  background-color: $header-bg;
}

.usa-logo {
  a {
    @if variable-exists(header-title) {
      color: $header-title;
    }
  }
}

.usa-nav-secondary-links {
  a {
    @if variable-exists(header-link) {
      color: $header-link;
    }

    &:hover {
      @if variable-exists(header-link-hover) {
        color: $header-link-hover;
      }
    }
  }
}

}