:root {
  color-scheme: dark;
  --background: #101312;
  --surface: #17201c;
  --text: #f7faf8;
  --muted: #aebbb5;
  --accent: #34d1a5;
  --line: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top, #183329 0, var(--background) 42rem);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 64px;
}

.brand, a { color: var(--accent); }
.brand { font-weight: 750; letter-spacing: -0.02em; }
nav a { margin-left: 20px; }

h1 {
  max-width: 700px;
  margin: 0 0 18px;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

h2 { margin-top: 48px; font-size: 24px; }
p, li { color: var(--muted); }
strong { color: var(--text); }

.lede {
  max-width: 650px;
  font-size: 21px;
}

.card {
  margin-top: 40px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(23, 32, 28, 0.86);
}

.button {
  display: inline-block;
  margin-top: 10px;
  padding: 11px 17px;
  border-radius: 999px;
  background: var(--accent);
  color: #09251c;
  font-weight: 700;
  text-decoration: none;
}

footer {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 560px) {
  main { padding-top: 32px; }
  nav { align-items: flex-start; margin-bottom: 48px; }
  nav span { display: block; }
  nav a { margin-left: 12px; }
  .card { padding: 22px; }
}