:root {
  color-scheme: light dark;
  --bg: #0b1020;
  --surface: #121a2d;
  --surface-2: #18233b;
  --text: #ecf2ff;
  --muted: #a8b5cd;
  --accent: #8fb7ff;
  --line: #2a3855;
  --max: 760px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(63, 110, 194, .22), transparent 34rem),
    var(--bg);
  color: var(--text);
  line-height: 1.7;
}

main {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 4.5rem 0 2.5rem;
}

.hero { padding: 2rem 0 1rem; }

.mark {
  display: grid;
  place-items: center;
  width: 3.25rem;
  height: 3.25rem;
  margin-bottom: 2rem;
  border: 1px solid #5d7db7;
  border-radius: 1rem;
  background: linear-gradient(145deg, #264a82, #17233c);
  box-shadow: 0 14px 40px rgba(0, 0, 0, .28);
  font-size: 1.4rem;
  font-weight: 750;
}

h1, h2 { line-height: 1.18; letter-spacing: -.025em; }
h1 { max-width: 17ch; margin: .2rem 0 1rem; font-size: clamp(2.3rem, 8vw, 4.5rem); }
article h1 { font-size: clamp(2.3rem, 7vw, 3.8rem); }
h2 { margin-top: 2.6rem; font-size: 1.35rem; }
p, li { color: var(--muted); }
strong { color: var(--text); }

.eyebrow {
  color: var(--accent);
  font-size: .78rem;
  font-weight: 750;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.lede { max-width: 62ch; font-size: 1.16rem; }

a { color: var(--accent); text-underline-offset: .2em; }
a:hover { color: #bdd2ff; }

.topnav { margin-bottom: 3rem; }
.topnav a { text-decoration: none; }

.cards {
  display: grid;
  gap: .8rem;
  margin-top: 2.5rem;
}

.card {
  display: grid;
  gap: .2rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: .8rem;
  background: rgba(18, 26, 45, .78);
  color: var(--text);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease, background .18s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #5373aa;
  background: var(--surface-2);
}

.card span { font-weight: 700; }
.card small { color: var(--muted); font-size: .92rem; }

article { padding-bottom: 1rem; }
article ul { padding-left: 1.25rem; }
article li + li { margin-top: .5rem; }

footer {
  margin-top: 4rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fc;
    --surface: #fff;
    --surface-2: #edf3ff;
    --text: #172139;
    --muted: #4d5b73;
    --accent: #245eb8;
    --line: #d7dfec;
  }
  body { background: radial-gradient(circle at 15% 0%, #dae7ff, transparent 34rem), var(--bg); }
  .mark { color: white; }
  .card { background: rgba(255, 255, 255, .82); }
}