:root {
  --bg: #06101c;
  --surface: #0d1a2b;
  --border: rgba(149, 176, 214, 0.22);
  --text: #f4f7fb;
  --muted: #a8b6c9;
  --accent: #b8f1ff;
  --focus: #72b8ff;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: "Avenir Next", "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(104, 171, 255, 0.18), transparent 28rem),
    var(--bg);
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 0.2rem;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 999px;
  color: #06101c;
  background: var(--accent);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
.site-footer,
main {
  width: min(46rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  padding-block: 1.5rem;
}

.brand {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding-inline: 0.7rem;
  color: var(--muted);
}

main {
  padding-block: 2rem 4rem;
}

article {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: rgba(13, 26, 43, 0.9);
  box-shadow: 0 1.5rem 4rem rgba(2, 8, 16, 0.3);
}

h1,
h2 {
  font-family: "Avenir Next", "SF Pro Display", "Helvetica Neue", sans-serif;
  letter-spacing: -0.035em;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  line-height: 1;
}

h2 {
  margin-top: 2.25rem;
  font-size: 1.45rem;
}

p,
li {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
}

strong {
  color: var(--text);
}

li + li {
  margin-top: 0.55rem;
}

.lead {
  color: var(--text);
  font-size: 1.15rem;
}

.site-footer {
  padding-block: 0 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: inherit;
}

@media (max-width: 36rem) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav a {
    padding-inline: 0 0.8rem;
  }
}