* {
  box-sizing: border-box;
}

body {
  background:
    radial-gradient(circle at 20% 0%, rgba(34, 211, 238, 0.2), transparent 28rem),
    linear-gradient(135deg, #0b1020, #111827 55%, #160f2e);
  color: #f8fafc;
  font-family: Avenir Next, Trebuchet MS, sans-serif;
  line-height: 1.6;
  margin: 0;
}

header,
main,
footer {
  margin: 0 auto;
  max-width: 860px;
  padding: 1.25rem;
}

header {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

a {
  color: #22d3ee;
  font-weight: 800;
}

h1 {
  font-size: clamp(2rem, 8vw, 4rem);
  line-height: 1;
  margin: 2rem 0 1rem;
}

h2 {
  color: #facc15;
  margin-top: 2rem;
}

p,
li {
  color: #cbd5e1;
  font-size: 1.05rem;
}

.card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  margin: 1rem 0;
  padding: 1rem;
}

footer {
  color: #94a3b8;
}