:root {
  --level1: #f89b24;
  --level2: #df5b2b;
  --level3: #c91f39;
  --level4: #802779;
  --level5: #444176;
  --gray:   #f0f0f0;
}

body {
  font: 17px sans-serif;
  background-color: var(--gray);
}

#content {
  max-width: 70em;
  margin-left: auto;
  margin-right: auto;
  padding: 1em;
  box-sizing: border-box;
}

#content {
  background-color: white;
  border-radius: 0.5em;
  max-width: 70em;
  margin-left: auto;
  margin-right: auto;
  box-shadow: 0 0.5em 1em lightgray;
}

#contents {
  display: flex;
  background-color: var(--level5);
  margin-bottom: 1em;
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 1em;
  margin: 2em -1em;
}

#contents > a {
  color: var(--level1);
}

#contents > a:hover {
  text-decoration: underline;
}

#contents > a:not(:last-of-type) {
  border-right: 5px double var(--level3);
  padding-right: 0.5em;
  margin-right: 0.5em;
}

.expand {
  flex: 1;
}

#author {
  color: white;
  text-align: right;
  position: absolute;
  right: 0.5em;
  top: 0.5em;
  background-color: inherit;
  padding: 0.5em;
}

h1 {
  color: white;
  background: linear-gradient(20deg, var(--level1) 13%, var(--level2) 33%, var(--level3) 66%, var(--level4) 86%, var(--level5) 100%);
  padding: 0.75em 0;
  border-radius: 1em 0;
}

h2 {
  margin-top: -3em;
  padding-top: 3em;
  color: var(--level1);
  border-bottom: 2px solid var(--level1);
}

h3 {
  color: var(--level2);
  text-decoration: underline;
}

h4 {
  color: var(--level3);
}

h5 {
  color: var(--level4);
  margin-bottom: 0.5em;
}

figure {
  box-sizing: border-box;
  margin: 1em;
}

a, a:visited {
  color: var(--level5);
  text-decoration: none;
}

pre {
  font-size: 0.85em;
}

code {
  border-bottom: 2px solid var(--level4);
}

pre > code {
  border: 2px solid var(--level4);
  padding: 0.5em;
  display: inline-block;
  width: 100%;
  box-sizing: border-box;
  position: relative;
}

ol.sources > li::before, sup a, sup a:visited {
  color: var(--level4);
}

dt:not(:first-child) {
  margin-top: 1em;
}

dd > p:first-child {
  margin-top: 0.5em;
}