CSS 等距菜单悬停效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <ul>
        <li style="--i:6;"><a href="#">Home</a></li>
        <li style="--i:5;"><a href="#">About</a></li>
        <li style="--i:4;"><a href="#">Services</a></li>
        <li style="--i:3;"><a href="#">Portfolio</a></li>
        <li style="--i:2;"><a href="#">Our Team</a></li>
        <li style="--i:1;"><a href="#">Contact</a></li>
    </ul>
</body>
</html>

*{
    margin: 0;
    padding:0;
    box-sizing: border-box;
    font-family: 'Oswald';
}
body{
    display: flex;
    justify-content: center;
    align-items:center;
    min-height: 100vh;
    background: #434750;
}
ul{
    position: relative;
    transform: skewY(-15deg);
    transition: 0.5s;
}
ul li{
    position: relative;
    list-style: none;
    width:200px;
    background-color: #3e3f46;
    padding:15px;
    z-index: var(--i);
    transition: 0.5s;
}
ul li:hover{
    background: #33a3ee;
    transform: translateX(-50px);
}
ul li::before{
    content: '';
    position:absolute;
    top: 0;
    left: -40px;
    width: 40px;
    height: 100%;
    background: #2e3133;
    transform-origin: right;
    transform: skewY(45deg);
    transition: 0.5s;
}
ul li:hover::before{
    background: #1f5378;
}
ul li::after{
    content: '';
    position: absolute;
    top: -40px;
    left: 0;
    width: 100%;
    height: 40px;
    background: #35383e;
    transform-origin: bottom;
    transform: skewX(45deg);
    transition: 0.5s;
}
ul li:hover::after{
    background: #2982b9;
}
ul li a{
    text-decoration: none;
    color: #999;
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: 0.5s;
}
ul li:hover a{
    color:#fff; 
}
ul li:last-child::after{
    box-shadow: -120px 120px 20px rgba(0,0,0,0.25);
}