:root {
  --hub-width: 420px;
  --logo-height: 42px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: #fff;
  color: #000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
}

a { color: inherit; }

.hub {
  width: 100%;
  max-width: var(--hub-width);
}

.hub__sites {
  list-style: none;
  padding: 0;
  margin: 0 0 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.75rem;
}

.hub__site {
  display: block;
  text-decoration: none;
  transition: transform 120ms ease;
}

.hub__site:hover,
.hub__site:focus-visible {
  transform: translateY(-2px);
}

.hub__site img {
  display: block;
  height: var(--logo-height);
  width: auto;
  max-width: 100%;
}

.hub__about {
  margin: 0;
  font-size: 0.95rem;
  color: #333;
  text-align: justify;
}

.hub__about a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

@media (max-width: 480px) {
  :root {
    --hub-width: 320px;
    --logo-height: 32px;
  }
}