/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  background: #111;
  height: 100%;
  font-family: 'Microsoft YaHei', sans-serif;
}

.container {
  background: #eff0f1;
  width: 100%;
  height: 100%;
  margin: 0 auto;
  -moz-transition: all 0.3s ease 0.6s;
  -o-transition: all 0.3s ease 0.6s;
  -webkit-transition: all 0.3s ease;
  -webkit-transition-delay: 0.6s;
  -webkit-transition: all 0.3s ease 0.6s;
  transition: all 0.3s ease 0.6s;
  z-index: 10;
  padding: 2em;
  position: relative;
}

.container.nav-open {
  margin-top: 8em;
  width: 90%;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

/*
  menu icon css3
*/
.menu-icon {
  position: relative;
  display: block;
  width: 2.5em;
  height: 2.5em;
  cursor: pointer;
}
.menu-icon:hover span {
  background: #222;
}
.menu-icon:hover span:before, .menu-icon:hover span:after {
  background: #222;
}

.menu-icon > span {
  position: absolute;
  top: 50%;
  display: block;
  width: 100%;
  height: 0.25em;
  background-color: #bbbbbb;
  border-radius: 3px;
  -webkit-transition: -webkit-transform 0.3s, background 0.25s ease;
  -webkit-transition: background 0.25s ease, -webkit-transform 0.3s;
  transition: background 0.25s ease, -webkit-transform 0.3s;
  transition: transform 0.3s, background 0.25s ease;
  transition: transform 0.3s, background 0.25s ease, -webkit-transform 0.3s;
}

.menu-icon > span:before,
.menu-icon > span:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #bbbbbb;
  border-radius: 3px;
  -webkit-transition: -webkit-transform 0.3s, background 0.25s ease;
  -webkit-transition: background 0.25s ease, -webkit-transform 0.3s;
  transition: background 0.25s ease, -webkit-transform 0.3s;
  transition: transform 0.3s, background 0.25s ease;
  transition: transform 0.3s, background 0.25s ease, -webkit-transform 0.3s;
}

.menu-icon > span:before {
  -webkit-transform: translateY(-0.75em);
  transform: translateY(-0.75em);
}

.menu-icon > span:after {
  -webkit-transform: translateY(0.75em);
  transform: translateY(0.75em);
}

/* OPENED */
.menu-icon.open {
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.menu-icon.open > span:before {
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}

.menu-icon.open > span:after {
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}

nav {
  position: fixed;
  top: 0;
  left: 5%;
  color: white;
  z-index: 1;
}
nav ul li.animate {
  top: 0;
}
nav ul li {
  display: inline-block;
  text-align: center;
  margin: 1em 2em;
  cursor: pointer;
  position: relative;
  top: -8em;
}
nav ul li:nth-child(1) {
  -moz-transition: top 0.3s ease 0.15s;
  -o-transition: top 0.3s ease 0.15s;
  -webkit-transition: top 0.3s ease;
  -webkit-transition-delay: 0.15s;
  -webkit-transition: top 0.3s ease 0.15s;
  transition: top 0.3s ease 0.15s;
}
nav ul li:nth-child(2) {
  -moz-transition: top 0.3s ease 0.2s;
  -o-transition: top 0.3s ease 0.2s;
  -webkit-transition: top 0.3s ease;
  -webkit-transition-delay: 0.2s;
  -webkit-transition: top 0.3s ease 0.2s;
  transition: top 0.3s ease 0.2s;
}
nav ul li:nth-child(3) {
  -moz-transition: top 0.3s ease 0.25s;
  -o-transition: top 0.3s ease 0.25s;
  -webkit-transition: top 0.3s ease;
  -webkit-transition-delay: 0.25s;
  -webkit-transition: top 0.3s ease 0.25s;
  transition: top 0.3s ease 0.25s;
}
nav ul li:nth-child(4) {
  -moz-transition: top 0.3s ease 0.3s;
  -o-transition: top 0.3s ease 0.3s;
  -webkit-transition: top 0.3s ease;
  -webkit-transition-delay: 0.3s;
  -webkit-transition: top 0.3s ease 0.3s;
  transition: top 0.3s ease 0.3s;
}
nav ul li:nth-child(5) {
  -moz-transition: top 0.3s ease 0.35s;
  -o-transition: top 0.3s ease 0.35s;
  -webkit-transition: top 0.3s ease;
  -webkit-transition-delay: 0.35s;
  -webkit-transition: top 0.3s ease 0.35s;
  transition: top 0.3s ease 0.35s;
}
nav ul li:hover {
  opacity: 1;
}
nav ul li i {
  font-size: 1.5em;
  background: #10d7af;
  padding: 0.75em;
  border-radius: 50%;
  color: white;
  display: inline-block;
  overflow: hidden;
  text-shadow: 0px 0px #0ca888, 1px 1px #0ca888, 2px 2px #0ca888, 3px 3px #0ca888, 4px 4px #0ca888, 5px 5px #0ca888, 6px 6px #0ca888, 7px 7px #0ca888, 8px 8px #0ca888, 9px 9px #0ca888, 10px 10px #0ca888, 11px 11px #0ca888, 12px 12px #0ca888, 13px 13px #0ca888, 14px 14px #0ca888, 15px 15px #0ca888, 16px 16px #0ca888, 17px 17px #0ca888, 18px 18px #0ca888, 19px 19px #0ca888, 20px 20px #0ca888, 21px 21px #0ca888, 22px 22px #0ca888, 23px 23px #0ca888, 24px 24px #0ca888, 25px 25px #0ca888, 26px 26px #0ca888, 27px 27px #0ca888, 28px 28px #0ca888, 29px 29px #0ca888, 30px 30px #0ca888, 31px 31px #0ca888, 32px 32px #0ca888, 33px 33px #0ca888, 34px 34px #0ca888, 35px 35px #0ca888, 36px 36px #0ca888, 37px 37px #0ca888, 38px 38px #0ca888, 39px 39px #0ca888, 40px 40px #0ca888, 41px 41px #0ca888, 42px 42px #0ca888, 43px 43px #0ca888, 44px 44px #0ca888, 45px 45px #0ca888, 46px 46px #0ca888, 47px 47px #0ca888, 48px 48px #0ca888, 49px 49px #0ca888, 50px 50px #0ca888, 51px 51px #0ca888, 52px 52px #0ca888, 53px 53px #0ca888, 54px 54px #0ca888, 55px 55px #0ca888, 56px 56px #0ca888, 57px 57px #0ca888, 58px 58px #0ca888, 59px 59px #0ca888, 60px 60px #0ca888;
}
nav ul li h4 {
  line-height: 2.5;
}