.hamburger {
  display: block;
  width: 50px;
  height: 50px;
  background-color: transparent;
  border: none;
  position: relative;
  z-index: 100;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  cursor: pointer;
  outline: none;
}
.hamburger.is-open .top {
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
}
.hamburger.is-open .middle {
  opacity: 0;
}
.hamburger.is-open .bottom {
  -webkit-transform: rotate(-45deg);
          transform: rotate(-45deg);
}
.hamburger span {
  display: block;
  width: 30px;
  height: 2px;
  margin: auto;
  background-color: #000;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  -webkit-transition: 0.5s ease;
  transition: 0.5s ease;
}
.hamburger span.top {
  -webkit-transform: translateY(-6px);
          transform: translateY(-6px);
}
.hamburger span.bottom {
  -webkit-transform: translateY(6px);
          transform: translateY(6px);
}

.nav {
  width: 60%;
  height: 100%;
  position: fixed;
  top: 0;
  right: 0;
  background-color: #fff;
  z-index: 99;
}
.nav.v-enter, .nav.v-leave-to {
  opacity: 0;
}
.nav.v-enter-to, .nav.v-leave {
  opacity: 1;
}
.nav.v-enter-active, .nav.v-leave-active {
  -webkit-transition: opacity 1s ease;
  transition: opacity 1s ease;
}
.nav__body {
  padding: 40px;
}
.nav__lst {
  list-style: none;
}
.nav__item {
  font-size: 20px;
  line-height: 1.3;
  font-weight: 700;
  border-bottom: 1px solid #333;
  padding-bottom: 14px;
  margin: 40px 0;
}
.nav__item ~ .nav__item {
  margin-top: 8px;
}
.nav__item a {
  color: #000;
  padding: 8px 0;
}
.nav__item span {
  font-size: 12px;
}
.nav__item span::before {
  content: "-";
}