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

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  padding: 2rem;
  font-family:"Myriad Pro", "Lucida Grande", "Trebuchet MS", sans-serif;
  color: #202020;
  background:
    url(../images/square_bg.png) repeat top left,
    url(../images/logo_transparent.png) no-repeat calc(100vw - 200px) 30px;
  background-size: auto, 150px 150px;
}

h1, h2 {
  padding-bottom: .5rem;
}

main ul {
  display: grid;
  margin: 2rem 0;
  height: calc(100% - 4rem);
  grid-template-rows: repeat(4, 1fr);
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 4px;
  list-style: none;
}

main ul li a {
  --baseHue: 213;
  --altHue: 199;

  --hue: var(--baseHue);
  --sat: 100%;
  --lum: 67%;
  --alpha: .4;

  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background-color: hsla(var(--hue), var(--sat), var(--lum), var(--alpha));
  transition: background-color .2s ease-in-out;
}

main ul li:nth-of-type(2n) a {
  --hue: var(--altHue);
}

main ul li a:hover {
  --alpha: .2;
}

main a:link,
main a:visited,
main a:active,
main a:hover {
  text-decoration: none;
}

a:link,
a:visited,
a:active,
a:hover {
  color: rgb(15, 15, 15);
  transition: color .2s;
}

.without-english-version {
  display: none;
}

@media screen and (max-width: 850px) {
  body {
    background: url(../images/square_bg.png) repeat top left;
  }

  main ul {
    grid-template-columns: repeat(2, 1fr);
  }

  main ul li:nth-of-type(2n) a {
    --hue: var(--baseHue)
  }

  main ul li:nth-of-type(4n + 1) a,
  main ul li:nth-of-type(4n + 4) a {
    --hue: var(--altHue)
  }
}

@media screen and (max-width: 530px) {
  body {
    padding: 1rem;
  }

  main ul {
    grid-template-columns: 1fr;
  }

  main ul li:nth-of-type(4n + 1) a,
  main ul li:nth-of-type(4n + 4) a {
    --hue: var(--baseHue)
  }

  main ul li:nth-of-type(2n) a {
    --hue: var(--altHue)
  }

  main ul li a {
    padding: 1rem;
  }
}