/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
body {
  font-size: 16px;
}

.header,
.content {
  width: 20rem;
  padding: 1rem;
  margin: 0 auto;
}

.header {
  position: relative;
}

h1 {
  padding: .5rem 1rem;
  margin: .5rem .5rem 0 .5rem;
  border-left: 0.1875rem solid #16a085;
  font-family: Helvetica, Arial, sans-serif;
  text-transform: uppercase;
  line-height: 130%;
}

.number {
  position: absolute;
  top: 2.1875rem;
  left: -1.25rem;
  color: #16a085;
  font-size: 2rem;
  font-family: Helvetiva, Arial, sans-serif;
}

.list {
  padding: .5rem 1rem;
  margin: .5rem .5rem 2rem .5rem;
  border-left: 0.1875rem solid #16a085;
}

.list__item {
  margin: 0 0 .5rem 0;
  padding: 0;
}

.label--checkbox,
.label--radio {
  position: relative;
  margin: .5rem;
  font-family: Arial, sans-serif;
  line-height: 135%;
  cursor: pointer;
}

.checkbox {
  position: relative;
  top: -0.375rem;
  margin: 0 1rem 0 0;
  cursor: pointer;
}
.checkbox:before {
  -webkit-transition: -webkit-transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  -moz-transition: -moz-transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  transition: transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  -webkit-transform: rotate(-45deg) scale(0, 0);
  -moz-transform: rotate(-45deg) scale(0, 0);
  -ms-transform: rotate(-45deg) scale(0, 0);
  -o-transform: rotate(-45deg) scale(0, 0);
  transform: rotate(-45deg) scale(0, 0);
  content: "";
  position: absolute;
  left: 0.1875rem;
  top: 0.125rem;
  z-index: 1;
  width: 0.75rem;
  height: 0.375rem;
  border: 2px solid #16a085;
  border-top-style: none;
  border-right-style: none;
}
.checkbox:checked:before {
  -webkit-transform: rotate(-45deg) scale(1, 1);
  -moz-transform: rotate(-45deg) scale(1, 1);
  -ms-transform: rotate(-45deg) scale(1, 1);
  -o-transform: rotate(-45deg) scale(1, 1);
  transform: rotate(-45deg) scale(1, 1);
}
.checkbox:after {
  content: "";
  position: absolute;
  top: -0.125rem;
  left: 0;
  width: 1rem;
  height: 1rem;
  background: #fff;
  border: 2px solid #f2f2f2;
  cursor: pointer;
}

.radio {
  position: relative;
  margin: 0 1rem 0 0;
  cursor: pointer;
}
.radio:before {
  -webkit-transition: -webkit-transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  -moz-transition: -moz-transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  transition: transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);
  -webkit-transform: scale(0, 0);
  -moz-transform: scale(0, 0);
  -ms-transform: scale(0, 0);
  -o-transform: scale(0, 0);
  transform: scale(0, 0);
  content: "";
  position: absolute;
  top: 0;
  left: 0.125rem;
  z-index: 1;
  width: 0.75rem;
  height: 0.75rem;
  background: #16a085;
  border-radius: 50%;
}
.radio:checked:before {
  -webkit-transform: scale(1, 1);
  -moz-transform: scale(1, 1);
  -ms-transform: scale(1, 1);
  -o-transform: scale(1, 1);
  transform: scale(1, 1);
}
.radio:after {
  content: "";
  position: absolute;
  top: -0.25rem;
  left: -0.125rem;
  width: 1rem;
  height: 1rem;
  background: #fff;
  border: 2px solid #f2f2f2;
  border-radius: 50%;
}

.footer {
  position: relative;
}

.btn {
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background 0.3s ease-in-out;
  position: absolute;
  top: 0;
  right: 4.5rem;
  padding: .5rem;
  background: #16a085;
  color: #fff;
  font-family: Helvetica, Arial, sans-serif;
  text-decoration: none;
}
.btn:hover {
  background: #138a72;
}

.btn--twitter {
  right: 2rem;
  background: #2980b9;
}
.btn--twitter:hover {
  background: #2472a4;
}