:root {
  color-scheme: light dark;
  font-family: system-ui, sans-serif;
}

body {
  margin: 0 auto;
  padding: 1.5rem;
  max-width: 42rem;
  line-height: 1.5;
}

nav {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

nav a[aria-current="true"] {
  font-weight: bold;
  text-decoration: none;
}

textarea {
  width: 100%;
  box-sizing: border-box;
  font-family: ui-monospace, monospace;
  font-size: 0.9rem;
  padding: 0.5rem;
}

button {
  margin-top: 0.75rem;
  padding: 0.5rem 1.25rem;
  font-size: 1rem;
}

ul#topics-list {
  margin-top: 1.5rem;
  padding-left: 1.25rem;
}

pre#output {
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 1rem;
  padding: 0.75rem;
  border: 1px solid;
  min-height: 2rem;
}

footer {
  margin-top: 2rem;
  font-size: 0.85rem;
  opacity: 0.75;
}