:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5d6678;
  --line: #dce2ec;
  --paper: #ffffff;
  --wash: #f4f7fb;
  --brand: #2258d6;
  --brand-dark: #173d97;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #edf3ff 0, var(--wash) 320px);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0 36px;
}

.hero, .article > header { padding: 36px 0 24px; }

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.14em;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.article h1 { font-size: clamp(2.1rem, 5vw, 3.7rem); }

.lead {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.14rem;
}

.card {
  margin: 22px 0;
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  box-shadow: 0 18px 45px rgba(25, 45, 90, 0.08);
}

.card h2 { margin: 1.7em 0 0.45em; line-height: 1.25; }
.card h2:first-child { margin-top: 0; }
.card p, .card ul { color: var(--muted); }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.link-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.link-card span { font-weight: 750; }
.link-card small { color: var(--muted); }

nav a { font-weight: 650; text-decoration: none; }

footer {
  padding: 20px 2px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .shell { padding-top: 28px; }
  .grid { grid-template-columns: 1fr; }
  .card { border-radius: 16px; }
}