CSS实现导航栏下拉动画详解

<nav class="navbar">
  <ul>
    <li><a href="#">首页</a></li>
    <li class="dropdown">
      <a href="#" class="dropbtn">产品</a>
      <ul class="dropdown-content">
        <li><a href="#">产品一</a></li>
        <li><a href="#">产品二</a></li>
        <li><a href="#">产品三</a></li>
      </ul>
    </li>
    <li><a href="#">关于我们</a></li>
  </ul>
</nav>

.navbar ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
}

.navbar ul li {
  position: relative;
}

.navbar ul li a {
  display: block;
  padding: 12px 16px;
  text-decoration: none;
  color: #333;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #fff;
  min-width: 160px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  list-style: none;
  padding: 0;
  margin: 0;
}

.dropdown-content li a {
  padding: 10px 16px;
}

.dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-content {
  transition: opacity 0.3s ease, transform 0.3s ease;
}