:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --canvas: #081923;
  --surface: #132538;
  --surface-soft: #1a3045;
  --text: #f5f8fb;
  --muted: #aebccc;
  --accent: #19b7aa;
  --line: rgba(255, 255, 255, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at top, #173146 0, var(--canvas) 42rem);
  line-height: 1.65;
}

a { color: #66ddd2; }

header,
main,
footer {
  width: min(880px, calc(100% - 36px));
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: 28px;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-decoration: none;
}

nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }

main { padding-block: 64px 80px; }

.hero {
  margin-bottom: 42px;
  padding: clamp(28px, 6vw, 56px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(145deg, rgba(25,183,170,.14), rgba(19,37,56,.92));
  box-shadow: 0 28px 80px rgba(0,0,0,.24);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2 { line-height: 1.16; }
h1 { margin: 0 0 16px; font-size: clamp(2.4rem, 8vw, 4.7rem); letter-spacing: -.05em; }
h2 { margin-top: 42px; font-size: 1.45rem; }
p, li { color: var(--muted); }
.lead { max-width: 660px; font-size: 1.15rem; }
.card {
  margin-block: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(19,37,56,.82);
}

.button {
  display: inline-flex;
  margin-top: 14px;
  padding: 11px 18px;
  color: #021714;
  border-radius: 999px;
  background: var(--accent);
  font-weight: 800;
  text-decoration: none;
}

footer {
  padding-block: 24px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

@media (max-width: 620px) {
  header { align-items: flex-start; flex-direction: column; }
  main { padding-top: 36px; }
}