.header {
  position: fixed;
  top: 0;
  left: 0;
}

.js-header {
  opacity: 0;
}

.header-logo {
  display: flex;
  justify-content: space-between;
  width: calc(270 * 100vw / 750); /* logoの幅: 270px */
  max-width: 270px;
  margin-left: calc(37 * 100vw / 750);
}

.header-logo-ico {
  width: calc(102 * 100% / 270);
  /* transition: 0.5s ease; */
}

.header-logo-txt {
  width: calc(160 * 100% / 270);
  margin-top: calc(8 * 100% / 270);
  object-fit: contain;
  transition: 0.25s ease-in-out;
}

.is-hidden {
  opacity: 0;
}

/* SP */
@media screen and (max-width:767px){ 
  .header-logo {
    transform: scale(1.2);
    transform-origin: 0%;
    margin-top: calc(50 * 100vw / 750);
  }
}

/* タブレット・PC */
@media screen and (min-width:768px){ 
  .header-logo {
    width: calc(270 * 100vw / 1366);
    min-width: 230px;
    margin-top: calc(24 * 100vw / 1366);
    margin-left: calc(37 * 100vw / 1366);
  }
}