/* basic menu styles */
.nav-menu {
    display: block;
    /* background: #74adaa;*/
    width:100%;
}
.nav-menu > li {
    display: inline;
    float:left;
}
.nav-menu > li:last-child {  border-right: none;  }
.nav-menu li a {
    color: #fff;
    display: block;
    text-decoration: none;
    -webkit-font-smoothing: antialiased;
    -moz-font-smoothing: antialiased;
    font-smoothing: antialiased;
    text-transform: capitalize;
    overflow: visible;
    line-height: 20px;
    font-size: 14px; width: 120px; height: 79px;
}
.three-d {
    /* 任务三、设置3D舞台布景 */
    -webkit-perspective: 200px;
    -moz-perspective: 200px;
    -ms-perspective: 200px;
    -o-perspective: 200px;
    perspective: 200px;
    /*任务四、设置3D舞台布景过渡效果*/
    -webkit-transition: all .07s linear;
    -moz-transition: all .07s linear;
    -ms-transition: all .07s linear;
    -o-transition: all .07s linear;
    transition:all .7s linear;
    position: relative;
}
.three-d:not(.active):hover {
    cursor: pointer;
}
/*任务五、给不是当前状态的3D舞台的悬浮与聚焦状态设置变形效果*/
.three-d:not(.active):hover .three-d-box,  .three-d:not(.active):focus .three-d-box {
    -wekbit-transform: translateZ(-28px) rotateX(90deg);
    -moz-transform: translateZ(-28px) rotateX(90deg);
    -o-transform: translateZ(-28px) rotateX(90deg);
    -ms-transform: translateZ(-28px) rotateX(90deg);
    transform: translateZ(-28px) rotateX(90deg);
    /*    -webkit-transform:rotateX(90deg) translatez(-25px);*/
    /*   -webkit-transform:rotatex(90deg);*/
}
.three-d-box {
    /*任务六、给3D舞台中“.three-d-box”设置过渡与变形效果*/
    -webkit-transition: all .3s ease-out;
    -moz-transition: all .3s ease-out;
    -ms-transition: all .3s ease-out;
    -o-transition: all .3s ease-out;
    transition: all .3s ease-out;
    -webkit-transform: translatez(-28px);
    -moz-transform: translatez(-28px);
    -ms-transform: translatez(-28px);
    -o-transform: translatez(-28px);
    transform: translatez(-28px);
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-pointer-events: none;
    -moz-pointer-events: none;
    -ms-pointer-events: none;
    -o-pointer-events: none;
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
}
/*任务七、给导航设置3D前，与3D后变形效果*/
.front {
    -webkit-transform: rotatex(0deg) translatez(28px);
    -moz-transform: rotatex(0deg) translatez(28px);
    -ms-transform: rotatex(0deg) translatez(28px);
    -o-transform: rotatex(0deg) translatez(28px);
    transform: rotatex(0deg) translatez(28px);
}
.back {
    -webkit-transform: rotatex(-90deg) translatez(28px);
    -moz-transform: rotatex(-90deg) translatez(28px);
    -ms-transform: rotatex(-90deg) translatez(28px);
    -o-transform: rotatex(-90deg) translatez(28px);
    transform: rotatex(-90deg) translatez(28px);
    color: #FFE7C4;
}
.front, .back {
    /*          border:1px solid red;*/
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    /*background: #fda603;*/
    /*padding: 15px 30px 15px 31px;*/
    color: #fff;
    -webkit-pointer-events: none;
    -moz-pointer-events: none;
    -ms-pointer-events: none;
    -o-pointer-events: none;
    pointer-events: none;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
/*任务八、设置导航当前状态与悬浮状态下的背景效果*/
.nav-menu li .active .front,  .nav-menu li .active .back,  .nav-menu li a:hover .front,  .nav-menu li a:hover .back {
    background-color: #fda603;
    color: #fff;
    -webkit-background-size: 5px 5px;
    background-size: 5px 5px;
    background-position: 0 0, 30px 30px;

}
.nav-menu ul {
    position: absolute;
    text-align: left;
    line-height: 40px;
    font-size: 14px;
    width: 200px;
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    -ms-transition: all 0.3s ease-in;
    -o-transition: all 0.3s ease-in;
    transition: all 0.3s ease-in;
    -webkit-transform-origin: 0px 0px;
    -moz-transform-origin: 0px 0px;
    -ms-transform-origin: 0px 0px;
    -o-transform-origin: 0px 0px;
    transform-origin: 0px 0px;
    -webkit-transform: rotateX(-90deg);
    -moz-transform: rotateX(-90deg);
    -ms-transform: rotateX(-90deg);
    -o-transform: rotateX(-90deg);
    transform: rotateX(-90deg);
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -ms-backface-visibility: hidden;
    -o-backface-visibility: hidden;
    backface-visibility: hidden;
}
/*任务九、显示下拉导航菜单，并其设置一个变形效果*/
.nav-menu > li:hover ul {
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    -ms-transform: rotateX(0deg);
    -o-transform: rotateX(0deg);
    transform: rotateX(0deg);
}


    .three-d-box small{ display: block; font-size: 12px; text-align: center; }