How to increase Bootstrap 3 Navbar height while keeping menu height small when collapsed

I am trying to increase the height of a top-fixed Bootstrap 3 navbar to 80px, but want to keep the original min-height at 50px, when the menu is collapsing (i.e. screen widths of less than 768px).

HTML:

<!-- Navigation Bar -->
<div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<a class="navbar-brand" href="#">Project</a>
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
        <span class="sr-only">Project</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
    </div>
    <div class="collapse navbar-collapse">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">Services</a></li>
        <li><a href="#contact">Contact</a></li>
        <li><a href="#contact">Support</a></li>
      </ul>
    </div><!--/.nav-collapse -->
  </div>
<!-- Navigation Bar End -->
</div>

I am using the following CSS and succesfully changed the navbar height, but the collapsed menu height is still at 80px:

.navbar-fixed-top {
min-height: 80px;
}

@media (min-width: 768px) {
.navbar {
border-radius: 4px;
min-height: 50px;
 }
}