:root {
  --base-dark: #558ba0;
  --base-light: #86dafc;
}

* {
  margin: 0;
}

body {
  font-family: YuGothic, "Yu Gothic", "游ゴシック体", "游ゴシック", Meiryo,
    "メイリオ", sans-serif;
  color: #fff;
  background-color: var(--base-light);
}

h1 {
  background-color: var(--base-dark);
  padding-top: 2px;
  line-height: 3.5rem;
  padding-left: 10px;
}

.cover img {
  vertical-align: top;
  width: 100%;
  min-height: 15vh;
  margin: 0;
  padding: 0;
}

.cover {
  position: relative;
  background-image: url(../images/header.png);
  background-size: cover;
  aspect-ratio: 16 / 9;
}

.cover p {
  color: var(--base-dark);
  background-color: #fff;
  font-weight: bold;
  position: absolute;
  margin-right: 10px;
  padding: 0 15px;
  bottom: 15px;
  left: 10px;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav li {
  background-color: var(--base-dark);
  text-align: center;
  margin-bottom: 10px;
  transition: 0.2s;
}

nav li:last-child {
  margin-bottom: 20px;
}

nav li:hover {
  background-color: #6bafc9;
}

nav a {
  display: block;
  text-decoration: none;
  color: #fff;
  font-weight: bold;
  padding: 10px;
  line-height: 2rem;
}

pre {
  white-space: pre-wrap;
  word-break: break-all;
}

div[id^="tos-"] {
  background-color: #fff;
  color: var(--base-dark);
  margin-bottom: 20px;
  padding: 15px;
}

div[id^="tos-"]:last-child {
  margin-bottom: 40px;
}

div[id^="tos-"] p,
div[id^="tos-"] ul {
  margin: 0.5rem 0;
}

div[id^="tos-"] h2,
h3 {
  background-color: var(--base-dark);
  color: #fff;
  padding: 0.2rem 0.5rem 0;
}

div[id^="tos-"] h2,
div[id^="tos-"] h3 a {
  color: #fff;
}

div[id^="tos-"] :not(h2, h3) a {
  color: var(--base-dark);
}

div[id^="tos-"] pre {
  margin: 0 10px 20px;
  padding: 10px;
  border: dotted var(--base-dark) 1px;
}

@media screen and (min-width: 780px) {

  .container,
  .cover {
    width: 780px;
    margin: 0 auto;
  }
}