:root {
  --bg: #333;
  --fg: #fff;
  --muted: rgba(255, 255, 255, 0.5);
  --max-width: 42em;
}

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

html,
body {
  height: 100%;
  margin: 0;
  background-color: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  text-shadow: 0 0.05rem 0.1rem rgba(0, 0, 0, 0.5);
  box-shadow: inset 0 0 5rem rgba(0, 0, 0, 0.5);
}

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

a,
a:focus,
a:hover {
  color: var(--fg);
  text-decoration: none;
}

.cover-container {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 1.5rem;
  margin: 0 auto;
}

.inner {
  padding: 0 1.5rem;
}

.masthead {
  margin-bottom: 2rem;
}

.masthead-brand {
  margin-bottom: 0;
  font-size: 1.5rem;
  font-weight: 400;
}

.nav-masthead {
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding-left: 0;
  list-style: none;
  margin: 0;
}

.nav-masthead .nav-link {
  padding: 0.25rem 0;
  font-weight: 700;
  color: var(--muted);
  border-bottom: 0.25rem solid transparent;
}

.nav-masthead .nav-link:hover,
.nav-masthead .nav-link:focus {
  border-bottom-color: rgba(255, 255, 255, 0.25);
}

.nav-masthead .active {
  color: var(--fg);
  border-bottom-color: var(--fg);
}

.cover {
  margin-top: auto;
  margin-bottom: auto;
  text-align: center;
}

.cover-heading {
  font-size: 2.75rem;
  font-weight: 400;
  margin: 0 0 1.5rem;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  line-height: 1.6;
  margin: 0 0 2rem;
}

.links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin: 2rem 0;
}

.links .btn {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-size: 0.95rem;
  color: #333;
  background-color: var(--fg);
  border: 0.05rem solid var(--fg);
  border-radius: 0.25rem;
  text-shadow: none;
  min-width: 14rem;
}

.links .btn-lg {
  padding: 1rem 1.75rem;
  font-size: 1.25rem;
}

.links .btn-secondary {
  background-color: transparent;
  color: var(--fg);
  border-color: rgba(255, 255, 255, 0.5);
}

.links .btn-secondary:hover,
.links .btn-secondary:focus {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--fg);
}

.mastfoot {
  margin-top: auto;
  padding-top: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.mastfoot .version {
  letter-spacing: 0.05em;
}

@media (min-width: 48em) {
  .masthead {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .masthead-brand {
    margin-right: 2rem;
  }
}