如何用css实现响应式导航栏折叠

<nav class="navbar">
  <div class="nav-toggle" id="mobile-menu">
    <span></span>
    <span></span>
    <span></span>
  </div>
  <ul class="nav-links">
    <li><a href="#home">首页</a></li>
    <li><a href="#about">关于</a></li>
    <li><a href="#services">服务</a></li>
    <li><a href="#contact">联系</a></li>
  </ul>
</nav>

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

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: white;
  margin: 3px 0;
  transition: 0.3s;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
  }
  .nav-links.active {
    display: flex;
  }
}

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