  <nav class="navbar navbar-expand-md navbar-dark bg-dark">
    <a class="navbar-brand" href="/">{{ project_name }}</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav">
        <li class="nav-item">
          <a class="nav-link" href="/">Home</a>
        </li>
        <li class="nav-item">
          <% if (session && session.userId) { %>
          <a class="nav-link" href="/auth/logout">Logout</a>
          <% } else { %>
          <a class="nav-link" href="/auth/login">Login</a>
          <% } %>
        </li>
      </ul>
    </div>
  </nav>
