:root {
  color-scheme: dark;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #081525;
  color: #f7f9fc;
}

* { box-sizing: border-box; }

html { background: #081525; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 32rem),
    #081525;
  color: #f7f9fc;
  line-height: 1.65;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 22px 80px;
}

header {
  border-bottom: 1px solid #26384d;
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.brand {
  color: #60a5fa;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .4px;
}

h1 {
  margin: 10px 0 8px;
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1.1;
}

h2 {
  margin-top: 34px;
  font-size: 22px;
}

p,
li { color: #cbd5e1; }

a {
  color: #60a5fa;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 3px solid #bfdbfe;
  outline-offset: 4px;
  border-radius: 4px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 18px;
}

nav a {
  text-decoration: none;
  font-weight: 700;
}

.card {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid #26384d;
  border-radius: 16px;
  background: #0d1d30;
}

.muted {
  color: #94a3b8;
  font-size: 14px;
}

code {
  color: #bfdbfe;
  background: #10243b;
  padding: 2px 6px;
  border-radius: 6px;
}

@media (max-width: 560px) {
  main { padding: 32px 18px 64px; }
  nav { gap: 12px; }
}