:root {
  color-scheme: dark;
  --bg: #080c18;
  --panel: #11182a;
  --text: #edf2ff;
  --muted: #a7b0c5;
  --accent: #72e5c2;
  --line: #25304a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #15203a 0, var(--bg) 42rem);
}

a { color: var(--accent); }

.site-header,
main,
footer {
  width: min(92%, 760px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 0;
}

.brand {
  color: var(--text);
  font-weight: 750;
  font-size: 1.15rem;
  text-decoration: none;
}

nav { display: flex; gap: 1.25rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }

main { padding: 7rem 0 5rem; }

.hero { max-width: 660px; }
.eyebrow {
  margin: 0 0 .6rem;
  color: var(--accent);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -.055em;
}

.intro { max-width: 580px; color: var(--muted); font-size: 1.15rem; }

.ad-slot {
  display: grid;
  min-height: 92px;
  margin: 4rem 0;
  place-items: center;
  border: 1px dashed var(--line);
  border-radius: 12px;
  color: #778199;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: color-mix(in srgb, var(--panel) 86%, transparent);
}

.card h2 { margin-top: 0; }
.card p { margin-bottom: 0; color: var(--muted); }

footer { padding: 2rem 0; color: var(--muted); font-size: .9rem; }

@media (max-width: 520px) {
  main { padding-top: 4.5rem; }
  .site-header { align-items: flex-start; }
}