@charset "UTF-8";
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html {
  font-family: "Noto Sans JP", -apple-system, system-ui, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "ヒラギノ角ゴ ProN W3", メイリオ, Meiryo, sans-serif;
  font-size: 62.5%;
  background: linear-gradient(180deg, #FFFFFF 38.54%, rgba(251, 251, 251, 0.31) 68.75%, rgba(52, 58, 218, 0.26) 100%);
}

html,
body {
  height: 100%;
}

html body {
  font-size: 1.6rem;
  background: #000;
  display: flex;
  flex-direction: column;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 1rem;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: initial;
  display: block;
}

a:hover {
  opacity: .5;
}

header {
  border-bottom: 2px solid #000;
  display: flex;
  justify-content: center;
  align-items: center;
}

footer {
  text-align: center;
  background: #ddd;
  padding: 2px 0;
  font-size: 14px;
  position: fixed;
  width: 100%;
  bottom: 0;
}

.btn-h {
  width: 20%;
  max-width: 200px;
  position: absolute;
  bottom: 30px;
  right: 20px;
}

.btn-h img {
  width: 100%;
}

html body .openAnime {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
}

html body .openAnime .item {
  font-size: 32px;
  font-size: 3.2rem;
  font-weight: 700;
  color: #fff;
  position: absolute;
  width: 100%;
  text-align: center;
  transform: translateY(0%);
  height: 100%;
  display: flex;
  justify-content: flex-end;
  flex-direction: column;
  animation: open-upper 2s ease 0s forwards;
}

@keyframes open-upper {
  0% {
    transform: translateY(0%);
    opacity: 0;
  }
  80% {
    transform: translateY(-50%);
    opacity: 1;
  }
  100% {
    transform: translateY(-50%) translateX(100%);
    opacity: 1;
  }
}

.toc__block {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding: 2em;
}

.toc__contents {
  background: #ddd;
  border: 1px solid #000;
}

.toc__contents a {
  padding: 1.7em 2em;
}

.sign {
  display: grid;
  height: inherit;
  place-content: center;
  text-align: center;
  padding-bottom: 20%;
}

.sign h2 {
  font-size: 200%;
  line-height: 1.7;
}