xD.css

@media (color) {
  html { color: lemonchiffon; background: indigo }
  :any-link { color: lightskyblue; background: transparent }
  ::selection { color: purple; background: lemonchiffon }
  em { text-shadow: 1pt 1pt 1pt mediumpurple }
  strong { text-shadow: 1pt 1pt 1pt fuchsia }
  abbr { text-shadow: 1pt 1pt 1pt fuchsia }
  b { text-shadow: 1pt 1pt 1pt skyblue }
  i { text-shadow: 1pt 1pt 1pt yellow }
}

@media (prefers-color-scheme: light) {
  html { color: indigo; background: lemonchiffon }
  :any-link { color: mediumblue }
  ::selection { color: lemonchiffon; background: purple }
}

:focus {
  outline: thick dotted;
}

html {
  font-family: monospace;
  font-size: max(3ch, 1vw + 1vh);
  line-height: 1.618;
  transition: 1s;
}

h1 {
  font-size: 1.618rem;
  margin-block: 1rem;
}

h2 { font-size: 1.382rem }
dt { font-size: 1.236rem; font-weight: 600 }
dt ~ dt { margin-top: 1em }
abbr { font-weight: 600 }
.\* { font-size: 1.618em }

article {
  align-items: center;
  display: flex;
  flex-flow: column;
  padding-block: 1rem;
  padding-inline: 1rem;
}

p {
  align-self: flex-start;
}

@media (orientation: portrait) {
  html {
    filter: hue-rotate(12deg);
    font-family: sans-serif;
  }
}