.demo-nav {
  background: #2d3748;
  padding: 1rem;
}

.demo-nav-brand {
  color: #fff;
  font-size: 1.25rem;
  font-weight: bold;
  text-decoration: none;
  display: block;
  margin-bottom: 1rem;
}

.demo-nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.demo-nav-item {
  margin-bottom: 0.5rem;
}

.demo-nav-link {
  color: #a0aec0;
  text-decoration: none;
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid #4a5568;
  transition: color 0.3s ease;
}

.demo-nav-link:hover {
  color: #fff;
}

@media (min-width: 768px) {
  .demo-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .demo-nav-brand {
    margin-bottom: 0;
  }
  
  .demo-nav-menu {
    display: flex;
    gap: 2rem;
  }
  
  .demo-nav-item {
    margin-bottom: 0;
  }
  
  .demo-nav-link {
    border-bottom: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
  }
  
  .demo-nav-link:hover {
    background: #4a5568;
  }
}