main { background-color: #011e60 }

#fade { width:100%; height:auto; position: relative; aspect-ratio: 16 / 9 }
.crossfader {
  overflow: hidden;
  position: relative;
  height: 100%;
}
.crossfaderIn {
  background-size: cover;
  background-position: center;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0;
  transform: scale(1);
  transition:
    opacity 3.5s cubic-bezier(0.455, 0.03, 0.515, 0.955),
    transform 3.5s cubic-bezier(0.455, 0.03, 0.515, 0.955);
}
.crossfaderIn.is-visible {
  z-index: 1;
  opacity: 1;
  transform: scale(1.06);
}
.crossfaderIn:nth-child(1) { background-image: url(./image/back_1954.jpg) }
.crossfaderIn:nth-child(2) { background-image: url(./image/back_1974.jpg) }
.crossfaderIn:nth-child(3) { background-image: url(./image/back_1982.jpg) }
.crossfaderIn:nth-child(4) { background-image: url(./image/back_1988.jpg) }
.crossfaderIn:nth-child(5) { background-image: url(./image/back_1999.jpg) }
.crossfaderIn:nth-child(6) { background-image: url(./image/back_2006.jpg) }
.crossfaderIn:nth-child(7) { background-image: url(./image/back_2007.jpg) }
.crossfaderIn:nth-child(8) { background-image: url(./image/back_2010.jpg) }
.crossfaderIn:nth-child(9) { background-image: url(./image/back_2011.jpg) }


.logo {
  background-image:url(./image/logo.webp);
  background-size:min(50vw,450px) auto;
  background-repeat: no-repeat;
  background-position: center;
  position: absolute;
  top: 0;
  left: 0;
  width:100%;
  height:auto;
  aspect-ratio: 16 / 9;
  z-index: 1
}
.cont {
  background: linear-gradient(to bottom, #011e60, #000);
  padding: min(15vw,100px) 0;
}


@media screen and ( max-width:750px ){
  /*～750 START*/
  #fade,
  .logo { aspect-ratio: 1 / 1 }
  /*～750 END*/
  }