body{
  margin: 0;
  font-family: "Noto Serif JP", serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  background-color: #f6f6f6;
}

/* 立体を映す部分 */
#scene{
  width:  100vw;
  height: 100dvh;
  overflow: hidden;
  perspective: 500px;
}
#scene * {
  transform-style: preserve-3d;
}

/* 空間に置かれた平面 */
#screen {
  width: 70%;
  min-width: 350px;
  max-width: 420px;
  height: 100000px;
}

/* text-aliveのやつ */
#text-alive-media {
  position: fixed;
  bottom: calc(100% - 5px);
  right: 5px;
  z-index: 1;
}

/* 初音ミクの画像 */
#miku{
  position: absolute;
  width: 300px;
  height: 300px;
  top: calc(50% - 90px);
  left: calc(50% - 150px);
  z-index: 1;
}

/* 楽曲選択パネル */
#select-panel{
  /* background-color: gray; */
  width: 340px;
  position: absolute;
  padding: 20px;
  z-index: 1;
}
#select-panel *{
  font-family: inherit;
}
#select-panel h1{
  text-align: center;
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 2px;
  margin: auto;
  width: fit-content
}
#select-panel ul{
  padding: 0;
  margin-top: 10px;
}
#select-panel li{
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 18px;
  color: #333333;
  padding: 7px 0;
  background-color: #ffffffdd;
  margin: 8px 0;
  text-align: center;
  outline: solid rgb(0, 200, 255) 1px;
}
#select-panel li .composer{
  font-size: 12px;
}
#select-panel li .composer::before{
  content: " / ";
}
.selectable:hover{
  text-decoration: underline;
  text-decoration-thickness: 1px;
  transform: scale(1.04);
}
.selectable:active{
  color: gray;
  transform: scale(1.08);
}
#select-panel li.selected-song{
  text-decoration: underline;
  text-decoration-thickness: 1px;
  transform: scale(1.04);
}
#select-panel button{
  font-size: 30px;
}
#select-panel h1.start{
  cursor: pointer;
  text-decoration: underline;
}
.start:active{
  color: gray;
}

/* 楽曲情報 */
#song-info{
  position: absolute;
  top: -1000px;
}
#song-info #title{
  font-size: 50px;
  width: 1000px;
}
#song-info #composer{
  font-size: 40px;
  width: 1000px;
  margin-top: 30px;
}

/* 感謝のメッセージ */
#thanks{
  position: absolute;
  top: 1000px;
  font-size: 60px;
  margin: 0;
}