.header {
  display: none;
}

.header_sp {
  position: fixed;
  z-index: 1000;
  top: 0;
  left: -100%;

  display: none;
  overflow: auto;

  width: 100%;
  height: 100%;
  padding: 16px;

  transition: left .6s;

  opacity: 0;
  background: #efefef;
}

@media screen and (max-width: 900px) {
  .header {
    display: flex;
    align-items: center;

    width: 100%;
    max-width: 1350px;
    margin: 0 auto 16px;
    padding: 8px 16px;

    transition: .3s;

    background: #efefef;
  }

  .header:hover {
    opacity: .8;
  }

  .header .header_name {
    display: flex;
  }

  .header .header_name span {
    font-size: 16px;
    font-weight: bold;

    display: flex;
    align-items: center;

    color: #4d5357;
  }

  .header_sp {
    display: block;

    opacity: 1;
  }

  .header_sp.active {
    left: 0;
  }

  .header .header_link_sp {
    margin-left: auto;
  }

  .header_sp .header_link li {
    margin-bottom: 16px;
  }

  .header_sp .header_link li a {
    display: block;

    padding: 8px;

    text-align-last: justify;
    text-decoration: none;

    color: #4d5357;
    border-bottom: solid 1px #4d5357;
  }

  .header_sp .header_link li a > svg {
    position: relative;

    transition: .3s;
  }

  .header_sp .header_link li a:hover > svg {
    transform: translate(-6px, 0);
  }

  .header_sp .header_link li a::before {
    position: relative;
    left: -8px;

    content: '';

    border-width: 5px;
    border-top: solid 8px;
    border-bottom: solid 8px;
  }

  .header_sp .header_link li a.red::before {
    border-color: #c30d23;
  }
  .header_sp .header_link li a.blue::before {
    border-color: #172a88;
  }

  .header_sp .header_link li a * {
    vertical-align: bottom;
  }
}