:root {
  --primary-background-color: #000;
  --primary-text-color: #fff;
  --nav-background-color: #04a779;
  --nav-link-color: #000;
  --body-columns: 1fr;
  --body-direction: "about" "assignments";
}
#preview {
  display: none;
}
@media screen and (min-width:800px) {
  :root {
    --body-columns: 1fr 2fr;
    --body-direction: "about about"
                      "assignments preview";
  }
  #preview {
    display: block;
  }
}
html {
  background-color: var(--primary-background-color);
  color: var(--primary-text-color);
}
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-auto-rows: auto 1fr auto;
  font-family: monospace;
}
header {
  width: 100%;
  display: grid;
  text-align: center;
}
nav {
  background-color: var(--nav-background-color);
  width: 100%;
  margin: 0;
}
nav ul li {
  display: inline;
  margin: 1rem;
  font-size: 1.1rem;
}
nav ul li a {
  text-decoration: none;
  color: var(--nav-link-color)
}
header h1 {
  margin-bottom: 0;
  font-size: clamp(2.75rem, 5vw, 6rem);
}
header h2 {
  margin-top: 0;
  font-size: clamp(1rem, 1.4vw, 1.8rem);
}
#body {
  display: grid;
  grid-template-columns: var(--body-columns);
  grid-template-areas: var(--body-direction);
  grid-auto-rows: auto 1fr;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}
#about {
  grid-area:about;
  font-size: 1.1rem;
}
#assignments {
  grid-area:assignments;
  font-size: 1.1rem;
}
#assignments a {
  color: var(--primary-text-color);
  text-decoration: none;
}
#assignments a:hover {
  color: lightgreen;
}
#preview {
  grid-area: preview;
}
#preview > * {
  display: none; /* Working on a way to have previews. WIP. */
}
#preview > .show {
  display: block;
}
#preview img {
  width: 100%;
}

footer {
  background-color: var(--nav-background-color);
  color: var(--nav-link-color);
  padding: 1rem;
}