:root {
  --bg: #0b1220;
  --fg: #e8eef7;
  --muted: #9aacbf;
  --accent: #2dd4bf;
  --btn: #1e3a5f;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--fg);
  background:
    radial-gradient(1200px 600px at 10% -10%, #134e4a 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1e3a5f 0%, transparent 50%),
    var(--bg);
}
.shell {
  max-width: 40rem;
  margin: 0 auto;
  padding: 18vh 1.5rem 3rem;
}
.brand {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 1rem;
  color: var(--accent);
}
h1 {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
  font-weight: 600;
}
.lead { color: var(--muted); margin: 0 0 1.75rem; line-height: 1.5; }
.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  border-radius: 0.4rem;
  text-decoration: none;
  color: var(--fg);
  background: var(--btn);
  border: 1px solid #334155;
}
.btn.primary {
  background: var(--accent);
  color: #042f2e;
  border-color: transparent;
  font-weight: 600;
}