.nav_toggle {
  display: none;
}
.nav {
  display: block;
  padding-right: 4%;
}
.nav.dspr{
  display: none;
}
.menu_pc {
  display: -webkit-flex;
  display: flex;
  justify-content: flex-end;
}
.menu_pc li {
  margin:0.75em 0.5em;
}

@media screen and (max-width: 768px) {
  .nav_toggle {
    display: block;
    position: relative;
    width: 1.75rem;
    height: 1.5rem;
    margin-right: 10px;
    z-index: 2;
  }
  .nav_toggle i {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #333;
    position: absolute;
    transition: transform 0.5s, opacity 0.5s;
  }
  .nav_toggle i:nth-child(1) {
    top: 0;
  }
  .nav_toggle i:nth-child(2) {
    top: 0;
    bottom: 0;
    margin: auto;
  }
  .nav_toggle i:nth-child(3) {
    bottom: 0;
  }

  .nav_toggle.show i:nth-child(1) {
    transform: translateY(10px) rotate(-45deg);
  }
  .nav_toggle.show i:nth-child(2) {
    opacity: 0;
  }
  .nav_toggle.show i:nth-child(3) {
    transform: translateY(-12px) rotate(45deg);
  }

  .nav {
    display: flex;
    position: fixed;
    /*align-items: center;*/
    justify-content: center;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s, visibility 0.5s;
    background-color: #fff;
    z-index: 1;
  }
  .menu_pc {
    display: none;
  }/*
  .nav_menu_sp {
  }*/
  .menu_sp li{
      font-weight: bold;
      border-top: 1px solid #eee;
      border-bottom: 1px solid #eee;
      padding: 0.75em 1.5em 0.75em 0;
      margin-bottom: -1px;
  }
  .menu_sp li a {
    text-decoration: none;
  }

  .nav.show {
    opacity: 1;
    visibility: visible;
  }
}