如何制作水平滚动导航的magicline动画？

<div class="nav-container">
  <ul>
    <li id="nav-item1">导航项1</li>
    <li id="nav-item2">导航项2</li>
    <li id="nav-item3">导航项3</li>
    <li id="nav-item4">导航项4</li>
  </ul>
  <div class="magic-line"></div>
</div>

.nav-container {
  position: relative;
}

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

li {
  padding: 10px;
  cursor: pointer;
}

.magic-line {
  position: absolute;
  bottom: 0;
  height: 2px;
  background-color: #000;
  transition: width 0.3s ease;
}

const navItems = document.querySelectorAll('.nav-container li');
const magicLine = document.querySelector('.magic-line');

function moveMagicLine() {
  const currentItem = document.querySelector('.current');
  const currentItemRect = currentItem.getBoundingClientRect();
  const containerRect = document.querySelector('.nav-container').getBoundingClientRect();
  
  const left = currentItemRect.left - containerRect.left;
  const width = currentItemRect.width;
  
  magicLine.style.width = `${width}px`;
  magicLine.style.transform = `translateX(${left}px)`;
}

navItems.forEach(item => {
  item.addEventListener('mouseover', () => {
    item.classList.add('current');
    moveMagicLine();
  });
  
  item.addEventListener('mouseout', () => {
    item.classList.remove('current');
    moveMagicLine();
  });
});