:root {
  color-scheme: dark;
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: #000;
  color: #fff;
  overflow-wrap: anywhere;
}

main {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 1.5rem;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 5vw, 3rem);
  letter-spacing: 0.18em;
}

.page-panel {
  width: min(100%, 48rem);
}

.page-description {
  margin: 1.25rem 0 0;
  color: #aaa;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  line-height: 1.7;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.site-nav a {
  border: 1px solid #444;
  color: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  padding: 0.75rem 1rem;
  text-decoration: none;
}

.site-nav a:hover {
  border-color: #fff;
}

.site-nav a[aria-current="page"] {
  background: #fff;
  color: #000;
}

.back-link {
  display: inline-block;
  margin-top: 1.5rem;
  color: inherit;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-underline-offset: 0.3em;
}

.back-link:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 0.4rem;
}

.site-nav a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 0.25rem;
}

@media (max-width: 36rem) {
  main {
    padding: 1.25rem;
  }

  h1 {
    letter-spacing: 0.12em;
  }

  .site-nav {
    flex-direction: column;
    margin: 2rem auto 0;
    max-width: 16rem;
  }
}