在悬停时填充整个倾斜的 li 标签

我制作ul（用于网站导航）左右边框成一定角度。

我正在努力解决:hover选择器填充整个li.

有没有办法实现这一目标，或者我需要改变我的方法吗？

section ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: left;
  list-style-type: none;
  margin: .5em 1em;
}
li {
  margin: 0;
  border-radius: 1px;
  position: relative;
  padding: 0.3em 0.8em;
  cursor: pointer;
}
li:nth-child(2n+1)::before {
  content: "";
  border-right: 2px solid black;
  transform: rotate(20deg);
  display: block;
  position: absolute;
  top: -2px;
  left: -5px;
  width: 2px;
  height: 120%;
}
li:nth-child(2n)::after {
  content: "";
  border-right: 2px solid black;
  transform: rotate(-20deg);
  display: block;
  position: absolute;
  top: -2px;
  left: -5px;
  width: 2px;
  height: 120%;
}
li:hover {
  background-color: black;
  color: white;
}

<section>
  <ul>
    <li><a>Link 1</a></li>
    <li><a>Link 2</a></li>
    <li><a>Link 3</a></li>
    <li><a>Link 4</a></li>
  </ul>
</section>

回答

section ul {
display: flex;
flex-wrap: wrap;
align-items: center;
list-style-type: none;
margin: .5em 1em;
}
li {
position: relative;
padding: 0.3em 0.8em;
cursor: pointer;
z-index: 0;
}
li:before,
li:after {
content: "";
position: absolute;
z-index: -1;
top: 0;
bottom: 0;
width: 70%;
}
li:before {
left: -1px;
border-left: 2px solid #000;
}
li:after {
right: -1px;
border-right: 2px solid #000;
}
li:after,
li:nth-child(odd):before {
transform: skewX(-15deg)
}
li:before,
li:nth-child(odd):after {
transform: skewX(15deg)
}
li:hover {
color: #fff;
}
li:hover:before,
li:hover:after {
background: #000;
}

<section>
<ul>
<li><a>Link 1</a></li>
<li><a>Link 2</a></li>
<li><a>Link 3</a></li>
<li><a>Link 4</a></li>
</ul>
</section>