如何通过css实现导航栏响应式折叠

<nav class="navbar">
  <div class="nav-header">
    <span class="nav-logo">Logo</span>
    <button class="nav-toggle" aria-label="Toggle navigation">
      &#9776;
    </button>
  </div>
  <ul class="nav-links">
    <li><a href="#">首页</a></li>
    <li><a href="#">关于</a></li>
    <li><a href="#">服务</a></li>
    <li><a href="#">联系</a></li>
  </ul>
</nav>

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333;
  padding: 1rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 1rem;
  }

  .nav-links.active {
    display: flex;
  }
}

document.querySelector('.nav-toggle').addEventListener('click', function() {
  document.querySelector('.nav-links').classList.toggle('active');
});