html,
body,
h1,
h2,
h3,
hr,
p {
  margin: 0;
  padding: 0;
}

h1,
h2,
h3 {
  font-family: monospace;
}

body {
  font-family: sans-serif;
  color: #000000;
}

a {
  color: #333399;
}

a:hover,
a:focus {
  font-weight: bold;
}

nav {
  position: sticky;
  top: 1rem;

  z-index: 10;

  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  flex-wrap: wrap;

  padding: 0 0 1rem 1rem;
}

nav a {
  border: 1px solid #101010;
  background-color: #ffffff;
  padding: 0.5rem;
}

img {
  max-width: 100%;
}

footer {
  background-color: #dedede;
  color: #101010;
}

main {
  background-color: #ccccff;
}

.flex-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.text-content p {
  letter-spacing: 0.1rem;
  line-height: 1.25rem;
}

.group {
  display: flex;
  flex-direction: column;
  gap: 1rem;

  background-color: var(--bg-colour);
}

.group-title {
  display: flex;
  flex-direction: column;
  align-items: flex-start;

  gap: 0.5rem;
}

.group-subtitle {
  font-size: 0.9rem;
  font-style: italic;
  font-weight: bold;
}

.group-content {
  align-items: flex-start;

  border: 1px solid #101010;
  background-color: #ffffff;

  padding: 0.5rem;
}

hr {
  width: 100%;
  height: 1px;

  color: transparent;
  background-color: #101010;
}

.section-padding {
  padding: 3rem 1rem;
}

@media (prefers-color-scheme: dark) {
  main {
    background-color: #220066;
    color: #ffffff;

    text-shadow: 2px 2px 0px #000000;
  }

  a {
    color: #ffff66;
  }

  nav a {
    background-color: #191919;

    border-color: #dedede;
  }

  .group {
    background-color: var(--bg-colour-dark);
  }

  .group-content {
    border: 1px solid #ffffff;
    background-color: #333333;
  }

  hr {
    color: #333333;
    height: 2px;
    background-color: #ffffff;
  }

  footer {
    color: #dedede;
    background-color: #101010;
  }
}

@media screen and (min-width: 768px) {
  :root {
    font-size: 20px;
  }

  nav {
    top: 1.5rem;
    padding: 0 0 1.5rem 1.5rem;
  }

  .section-padding {
    padding: 4.5rem 1.5rem;
  }

  .group {
    flex-direction: row;
    align-items: flex-start;
  }

  .group:nth-child(even) {
    flex-direction: row-reverse;
  }

  .group:nth-child(even) .group-title {
    align-items: flex-end;
  }

  .group-title {
    position: sticky;
    top: 4.5rem;

    flex-basis: 30%;
  }

  .group-content {
    flex-basis: 70%;

    padding: 1rem;
  }
}