/* ハンバーガーメニューのアニメーション */
/* activeなし */

.menu-trigger,
.menu-trigger span {
    display: inline-block;
    transition: all .4s;
    box-sizing: border-box;
}

.menu-trigger {
    position: relative;
    width: 40px;
    height: 36px;
}

.menu-trigger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: dimgray;
    border-radius: 4px;
}

.menu-trigger span:nth-of-type(1) {
    top: 0;
}

.menu-trigger span:nth-of-type(2) {
    top: 16px;
}

.menu-trigger span:nth-of-type(3) {
    bottom: 0;
}


/* activeあり */

.menu-trigger.active span:nth-of-type(1) {
  -webkit-transform: translateY(16px) rotate(-315deg);
  transform: translateY(16px) rotate(-315deg);
}
.menu-trigger.active span:nth-of-type(2) {
  opacity: 0;
}
.menu-trigger.active span:nth-of-type(3) {
  -webkit-transform: translateY(-16px) rotate(315deg);
  transform: translateY(-16px) rotate(315deg);
}