:root {
  --light: #f4f4f4;
  --cyan: #509c93;
  --light-gray: #eee;
  --medium-gray: #ddd;
  --gray: #6a6a6a;
  --dark: #444;
  --darker: #222;
}

html {
  background: var(--light);
  -webkit-text-size-adjust: none;
  font-family: "InterVar", -apple-system, BlinkMacSystemFont, "Roboto", "Segoe UI", sans-serif;
}

::selection {
  background: var(--medium-gray);
  opacity: 0.3;
}

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  max-width: 750px;
  padding: 0 13px;
  margin: 40px auto;
}

main, footer {
  font-size: 1rem;
  padding: 0;
  line-height: 160%;
}

main h1, h2, h3, .small-heading {
  font-family: "InterDisplay", -apple-system, BlinkMacSystemFont, "Roboto", "Segoe UI", sans-serif;
  font-weight: 500;
}

strong {
  font-weight: 500;
}

main h1 {
  font-size: 20px;
  padding: 10px 0 10px 0;
}

main h2 {
  font-size: 18px;
}

main h2, h3 {
  padding: 20px 0 15px 0;
}

nav {
  padding-top: 1rem;
}

nav ul {
  padding: 0;
  margin: 0;
  list-style: none;
  padding-bottom: 20px;
}

nav ul li {
  padding-right: 10px;
  display: inline-block;
}

a {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-decoration: none;
  word-wrap: break-word;
}

a {
  color: var(--darker);
  border-bottom: 1.5px solid var(--medium-gray);
}

a:hover {
  border-bottom: 1.5px solid var(--gray);
}

.index {
  display: grid;
  grid-template-columns: 6em 1fr 7em;
  grid-row-gap: 0.5em;
}

.index-headings {
  display: grid;
  grid-template-columns: 6em 1fr 7em;
  padding-bottom: 1.2em;
  padding-top: 1.2em;
}

@media (max-width: 385px) {
  .index {
    grid-row-gap: 0.8em;
  }
}