CSS3如何实现的炫酷菜单代码分享

<ul class="menu">
<li><a rel="nofollow noopener noreferrer" href="#">Home</a></li>
<li><a rel="nofollow noopener noreferrer" href="#s1">Menu 1</a>
<ul class="submenu">
<li><a rel="nofollow noopener noreferrer" href="#">Submenu a</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu b</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu c</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu d</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu e</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu f</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu g</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu h</a></li>
</ul>
</li>
<li class="active"><a rel="nofollow noopener noreferrer" href="#s2">Menu 2</a>
<ul class="submenu">
<li><a rel="nofollow noopener noreferrer" href="#">Submenu a</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu b</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu c</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu d</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu e</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu f</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu g</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu h</a></li>
</ul>
</li>
<li><a rel="nofollow noopener noreferrer" href="#">Menu 3</a>
<ul class="submenu">
<li><a rel="nofollow noopener noreferrer" href="#">Submenu a</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu b</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu c</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu d</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu e</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu f</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu g</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Submenu h</a></li>
</ul>
</li>
<li><a rel="nofollow noopener noreferrer" href="#">Menu 4</a></li>
<li><a rel="nofollow noopener noreferrer" href="#">Menu 5</a></li>
</ul>

.menu, .menu ul {
list-style: none;
padding: 0;
margin: 0;
}
.menu {
height: 58px;
}
.menu li {
background: -moz-linear-gradient(#292929, #252525);
background: -ms-linear-gradient(#292929, #252525);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #292929), color-stop(100%, #252525));
background: -webkit-linear-gradient(#292929, #252525);
background: -o-linear-gradient(#292929, #252525);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#292929', endColorstr='#252525');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#292929', endColorstr='#252525')";
background: linear-gradient(#292929, #252525);

border-bottom: 2px solid #181818;
border-top: 2px solid #303030;
min-width: 160px;
}
.menu > li {
display: block;
float: left;
position: relative;
}
.menu > li:first-child {
border-radius: 5px 0 0;
}
.menu a {
border-left: 3px solid rgba(0, 0, 0, 0);
color: #808080;
display: block;
font-family: 'Lucida Console';
font-size: 18px;
line-height: 54px;
padding: 0 25px;
text-decoration: none;
text-transform: uppercase;
}

.menu li:hover {
background-color: #1c1c1c;
background: -moz-linear-gradient(#1c1c1c, #1b1b1b);
background: -ms-linear-gradient(#1c1c1c, #1b1b1b);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #1c1c1c), color-stop(100%, #1b1b1b));
background: -webkit-linear-gradient(#1c1c1c, #1b1b1b);
background: -o-linear-gradient(#1c1c1c, #1b1b1b);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1c1c1c', endColorstr='#1b1b1b');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#1c1c1c', endColorstr='#1b1b1b')";
background: linear-gradient(#1c1c1c, #1b1b1b);

border-bottom: 2px solid #222222;
border-top: 2px solid #1B1B1B;
}
.menu li:hover > a {
border-radius: 5px 0 0 0;
border-left: 3px solid #C4302B;
color: #C4302B;
}

/* submenu styles */
.submenu {
left: 0;
max-height: 0;
position: absolute;
top: 100%;
z-index: 0;
-webkit-perspective: 400px;
-moz-perspective: 400px;
-ms-perspective: 400px;
-o-perspective: 400px;
perspective: 400px;
}
.submenu li {
opacity: 0;
-webkit-transform: rotateY(90deg);
-moz-transform: rotateY(90deg);
-ms-transform: rotateY(90deg);
-o-transform: rotateY(90deg);
transform: rotateY(90deg);
-webkit-transition: opacity .4s, -webkit-transform .5s;
-moz-transition: opacity .4s, -moz-transform .5s;
-ms-transition: opacity .4s, -ms-transform .5s;
-o-transition: opacity .4s, -o-transform .5s;
transition: opacity .4s, transform .5s;
}
.menu .submenu li:hover a {
border-left: 3px solid #454545;
border-radius: 0;
color: #ffffff;
}
.menu > li:hover .submenu, .menu > li:focus .submenu {
max-height: 2000px;
z-index: 10;
}
.menu > li:hover .submenu li, .menu > li:focus .submenu li {
opacity: 1;
-webkit-transform: none;
-moz-transform: none;
-ms-transform: none;
-o-transform: none;
transform: none;
}

/* CSS3 delays for transition effects */
.menu li:hover .submenu li:nth-child(1) {
-webkit-transition-delay: 0s;
-moz-transition-delay: 0s;
-ms-transition-delay: 0s;
-o-transition-delay: 0s;
transition-delay: 0s;
}
.menu li:hover .submenu li:nth-child(2) {
-webkit-transition-delay: 50ms;
-moz-transition-delay: 50ms;
-ms-transition-delay: 50ms;
-o-transition-delay: 50ms;
transition-delay: 50ms;
}
.menu li:hover .submenu li:nth-child(3) {
-webkit-transition-delay: 100ms;
-moz-transition-delay: 100ms;
-ms-transition-delay: 100ms;
-o-transition-delay: 100ms;
transition-delay: 100ms;
}
.menu li:hover .submenu li:nth-child(4) {
-webkit-transition-delay: 150ms;
-moz-transition-delay: 150ms;
-ms-transition-delay: 150ms;
-o-transition-delay: 150ms;
transition-delay: 150ms;
}
.menu li:hover .submenu li:nth-child(5) {
-webkit-transition-delay: 200ms;
-moz-transition-delay: 200ms;
-ms-transition-delay: 200ms;
-o-transition-delay: 200ms;
transition-delay: 200ms;
}
.menu li:hover .submenu li:nth-child(6) {
-webkit-transition-delay: 250ms;
-moz-transition-delay: 250ms;
-ms-transition-delay: 250ms;
-o-transition-delay: 250ms;
transition-delay: 250ms;
}
.menu li:hover .submenu li:nth-child(7) {
-webkit-transition-delay: 300ms;
-moz-transition-delay: 300ms;
-ms-transition-delay: 300ms;
-o-transition-delay: 300ms;
transition-delay: 300ms;
}
.menu li:hover .submenu li:nth-child(8) {
-webkit-transition-delay: 350ms;
-moz-transition-delay: 350ms;
-ms-transition-delay: 350ms;
-o-transition-delay: 350ms;
transition-delay: 350ms;
}
.submenu li:nth-child(1) {
-webkit-transition-delay: 350ms;
-moz-transition-delay: 350ms;
-ms-transition-delay: 350ms;
-o-transition-delay: 350ms;
transition-delay: 350ms;
}
.submenu li:nth-child(2) {
-webkit-transition-delay: 300ms;
-moz-transition-delay: 300ms;
-ms-transition-delay: 300ms;
-o-transition-delay: 300ms;
transition-delay: 300ms;
}
.submenu li:nth-child(3) {
-webkit-transition-delay: 250ms;
-moz-transition-delay: 250ms;
-ms-transition-delay: 250ms;
-o-transition-delay: 250ms;
transition-delay: 250ms;
}
.submenu li:nth-child(4) {
-webkit-transition-delay: 200ms;
-moz-transition-delay: 200ms;
-ms-transition-delay: 200ms;
-o-transition-delay: 200ms;
transition-delay: 200ms;
}
.submenu li:nth-child(5) {
-webkit-transition-delay: 150ms;
-moz-transition-delay: 150ms;
-ms-transition-delay: 150ms;
-o-transition-delay: 150ms;
transition-delay: 150ms;
}
.submenu li:nth-child(6) {
-webkit-transition-delay: 100ms;
-moz-transition-delay: 100ms;
-ms-transition-delay: 100ms;
-o-transition-delay: 100ms;
transition-delay: 100ms;
}
.submenu li:nth-child(7) {
-webkit-transition-delay: 50ms;
-moz-transition-delay: 50ms;
-ms-transition-delay: 50ms;
-o-transition-delay: 50ms;
transition-delay: 50ms;
}
.submenu li:nth-child(8) {
-webkit-transition-delay: 0s;
-moz-transition-delay: 0s;
-ms-transition-delay: 0s;
-o-transition-delay: 0s;
transition-delay: 0s;
}