/*
選單線
*/
.line {
  width: 24px;
  height: 24px;
  background: #fff;
  cursor: pointer;
  display: block;
  padding: 16px;
  position: fixed;
  z-index: 2;
}
.line .menu,
.line .menu::before,
.line .menu::after {
  background: #222;
  content: "";
  display: block;
  height: 1px;
  position: absolute;
  transition: background ease 0.15s, top ease 0.15s 0.15s, transform ease 0.15s;
  width: 20px;
}
.line .menu {
  left: 18px;
  top: 27px;
}

.line .menu::before {
  top: -6px;
}

.line .menu::after {
  top: 6px;
}
/*
點選選單變叉叉
*/
#menu:checked + .line .menu {
  background: transparent;
}

#menu:checked + .line .menu::before {
  transform: rotate(45deg);
}

#menu:checked + .line .menu::after {
  transform: rotate(-45deg);
}

#menu:checked + .line .menu::before,
#menu:checked + .line .menu::after {
  top: 0;
  transition: top ease 0.15s, transform ease 0.15s 0.15s;
}

/*
選單開合
*/
#menu:checked ~ .menu-list {
  width: 200px;
}

.menu-list {
  width: 60px;
  height: 100vh;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding-top: 60px;
  position: fixed;
  z-index: 1;
  transition: all 0.3s;
  overflow: hidden;
}
/*
選單向外推
*/
.menu-list ul {
  list-style: none;
  margin-left: 70px;
  padding: 0;
}
.menu-list ul > li {
  display: block;
  width: 100px;
}
/*
隱藏核許框
*/
input#menu {
  display: none;
}