*,
*::before,
*::after {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

:root {
  --hue-neutral: 200;
  --hue-correct: 120;
  --hue-incorrect: 0;
}

body {
  --hue: var(--hue-neutral);

  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: hsl(var(--hue), 100%, 20%);
}

body.correct,
.btn.correct {
  --hue: var(--hue-correct);
  color: black;
}

body.incorrect,
.btn.incorrect {
  --hue: var(--hue-incorrect);
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  width: 40rem;
  max-width: 80%;
  box-shadow: 0 0 1rem 0.2rem black;
}

.question {
  margin: 0;
  text-align: center;
  font-size: 1.5rem;
}

.options {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 1rem;
  margin: 1rem 0;
}

.btn {
  --hue: var(--hue-neutral);

  background: hsl(var(--hue), 100%, 50%);
  border: 0.2rem solid hsl(var(--hue), 100%, 60%);
  border-radius: 0.5rem;
  color: white;
  padding: 1rem;
  font-size: 1.2rem;
}

.btn:hover {
  border-color: black;
}

.selected {
  border: 0.3rem solid black;
}

.controls {
  display: flex;
  justify-content: center;
}

.start,
.next {
  width: 100%;
  font-size: 1.5rem;
}

.hide {
  display: none;
}

@media (max-width: 40rem) {
  .options {
    grid-template-columns: auto;
  }
}