.menu-trigger {
  display: none
}
@media only screen and (max-width: 910px) {
  .overlay {
    content: "";
    display: block;
    width: 0;
    height: 0;
    background-color: rgba(0, 0, 0, 0.5);
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    opacity: 0;
    transition: opacity .5s;
  }
  .overlay.open {
    width: 100%;
    height: 100%;
    opacity: 1;
  }
  header nav {
    /*position:fixed;にし、z-indexの数値を大きくして前面へ*/
    position: fixed;
    z-index: 999;
    /*ナビのスタート位置と形状*/
    top: -120%;
    left: 0;
    width: 100%;
    height: 100vh; /*ナビの高さ*/
    background: #005438;
    opacity: 0.85;
    /*動き*/
    transition: all 0.6s;
  }
  /*ナビゲーションの縦スクロール*/
  .header-list {
    /*ナビの数が増えた場合縦スクロール*/
    position: fixed;
    z-index: 999;
    width: 100%;
    height: 100vh; /*表示する高さ*/
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0;
  }
  .header-list ul {
    padding: 0;
  }
  /*========= ボタンのためのCSS ===============*/
  header nav.open {
    top: 0;
  }
  header nav.open a {
    color: #fff;
  }
  header nav li {
    text-align: center;
    padding: 10px 0;
    margin-top: 10px;
    font-size: 110%;
    letter-spacing: 5px;
  }
  header nav li ul li {
    text-align: center;
    padding: 0px 0;
    margin-top: 5px;
    font-size: 85%;
  }
  * {
    box-sizing: border-box;
  }
  header ul {
    list-style: none;
  }
  .menu-trigger, .menu-trigger span {
    position: fixed;
    z-index: 9999; /*ボタンを最前面に*/
    display: inline-block;
    transition: all .4s;
    box-sizing: border-box;
  }
  .menu-trigger {
    position: fixed;
    z-index: 9998; /*ボタンを最前面に*/
    width: 35px;
    height: 30px;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    appearance: none;
    cursor: pointer;
  }
  .menu-trigger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: white;
    border-radius: 2px;
  }
  .menu-trigger span:nth-of-type(1) {
    top: 0;
  }
  .menu-trigger span:nth-of-type(2) {
    top: 14px;
  }
  .menu-trigger span:nth-of-type(3) {
    bottom: 0;
  }
  .menu-trigger span:nth-of-type(1) {
    animation: menu-bar01 .75s forwards;
  }
}
@keyframes menu-bar01 {
  0% {
    transform: translateY(20px) rotate(45deg);
  }
  50% {
    transform: translateY(20px) rotate(0);
  }
  100% {
    transform: translateY(0) rotate(0);
  }
}
.menu-trigger span:nth-of-type(2) {
  transition: all .25s .25s;
  opacity: 1;
}
.menu-trigger span:nth-of-type(3) {
  animation: menu-bar02 .75s forwards;
}
@keyframes menu-bar02 {
  0% {
    transform: translateY(-20px) rotate(-45deg);
  }
  50% {
    transform: translateY(-20px) rotate(0);
  }
  100% {
    transform: translateY(0) rotate(0);
  }
}
.menu-trigger.active span:nth-of-type(1) {
  animation: active-menu-bar01 .75s forwards;
}
@keyframes active-menu-bar01 {
  0% {
    transform: translateY(0) rotate(0);
  }
  35% {
    transform: translateY(19px) rotate(0);
  }
  100% {
    transform: translateY(19px) rotate(45deg);
  }
}
.menu-trigger.active span:nth-of-type(2) {
  opacity: 0;
}
.menu-trigger.active span:nth-of-type(3) {
  animation: active-menu-bar03 .75s forwards;
}
@keyframes active-menu-bar03 {
  0% {
    transform: translateY(0) rotate(0);
  }
  35% {
    transform: translateY(-10px) rotate(0);
  }
  100% {
    transform: translateY(-10px) rotate(-45deg);
  }
}
/**tuika**/
.menutrigger-color span {
  background-color: #AFAFAF;
}
.menutrigger-color span:nth-of-type(2) {
  transition: all .0s .0s;
}