:root {
  --color-grafit: #23262b;
  --color-mares: #e4d6bf;
  --color-oxid: #b4440f;
  --color-coure: #d9824a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--color-mares);
  color: var(--color-grafit);
  font-family: system-ui, sans-serif;
  text-align: center;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 16px 48px;
}

/* La majúscula PRK fa aproximadament el 19% de l'amplada de la placa. */
.brand {
  padding: clamp(48px, 14vw, 72px) 0;
}

.brand img {
  display: block;
  width: max(210px, min(320px, 64vw));
  height: auto;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 8vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

footer {
  padding: 0 16px 56px;
}

ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 4px;
}

a img { display: block; width: 24px; height: 24px; }
a:hover { box-shadow: inset 0 0 0 1px var(--color-grafit); }
a:focus-visible { outline: 3px solid var(--color-grafit); outline-offset: 5px; }

/* Dues trenes de 6 px i una ranura central de 2 px. */
body::after {
  content: '';
  display: block;
  height: 32px;
  flex-shrink: 0;
  background: linear-gradient(to bottom,
    var(--color-grafit) 0 7px,
    var(--color-coure) 7px 13px,
    var(--color-grafit) 13px 15px,
    #000 15px 17px,
    var(--color-grafit) 17px 19px,
    var(--color-coure) 19px 25px,
    var(--color-grafit) 25px);
}