@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  font-size: 62.5%;
  font-family: 'Montserrat', sans-serif;
}

#light,
:root:has(#light:checked) {
  --bg-color: #ecf0f1;
  --main-bg-color: #f8f8f8;
  --border-color: #dbdbdb;
  --title-color: #3f3f3f;
  --text-color: #222222;
}

#dark,
:root:has(#dark:checked) {
  --bg-color: #1a1a1a;
  --main-bg-color: #222222;
  --border-color: #333333;
  --title-color: white;
  --text-color: #ecf0f1;
}

body {
  font-size: 1.6rem;

  min-height: 100vh;
  background: var(--bg-color);

  display: flex;
  place-items: center;
}

main {
  max-width: 60rem;
  background: var(--main-bg-color);

  margin: 0 auto;
  padding: 2.8rem;

  border: 0.1rem solid var(--border-color);
  border-radius: 0.6rem;
}

main article h2 {
  color: var(--title-color);
  margin-block: 1.6rem;
}

main article p {
  color: var(--text-color);
  line-height: 2rem;

  margin-bottom: 1rem;
}

main article p:nth-child(3) {
  margin-bottom: 1.6rem;
}

ul {
  list-style: none;
  background: var(--main-bg-color);
  border: 0.1rem solid var(--border-color);
  border-radius: 5rem;
  padding: 1.5rem 2rem;

  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.6rem;

  position: fixed;
  bottom: 10%;
  left: 50%;
  transform: translateX(-50%);
}

ul li {
  display: flex;
  justify-content: center;
  align-items: center;
}

ul li + li {
  border-left: 1px solid var(--border-color);
  padding-left: 1.6rem;
}

input[type='radio'] {
  appearance: none;
  border: 0.1rem solid var(--border-color);
  border-radius: 5rem;

  width: 1.9rem;
  height: 1.9rem;
  margin-left: 1.6rem;

  cursor: pointer;
}

input[type='radio']:checked {
  background: var(--text-color);
}

@media only screen and (max-width: 600px), only screen and (max-height: 520px) {
  ul {
    width: fit-content;
    margin: 0 auto;
    position: relative;
  }
}