:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.7;
  background: #f3f5f7;
  color: #1d2939;
}
* { box-sizing: border-box; }
body { margin: 0; padding: 48px 20px; }
main {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px;
  border: 1px solid #d8dfe7;
  border-radius: 16px;
  background: #fff;
}
h1 { font-size: clamp(2rem, 5vw, 2.8rem); line-height: 1.2; margin: 12px 0 24px; }
h2 { font-size: 1.2rem; line-height: 1.4; margin: 0 0 12px; }
p { margin: 0 0 16px; }
.eyebrow { color: #485972; font-size: .9rem; }
.lead { font-size: 1.15rem; color: #485972; }
section { margin-top: 32px; }
a { color: #154cad; text-underline-offset: 3px; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid #3272da; outline-offset: 5px; }
footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid #d8dfe7;
  color: #485972;
  font-size: .9rem;
}
@media (max-width: 540px) {
  body { padding: 20px 12px; }
  main { padding: 24px 20px; }
}
@media (prefers-color-scheme: dark) {
  :root { background: #111820; color: #e8edf4; }
  main { background: #18222e; border-color: #334257; }
  .eyebrow, .lead, footer { color: #b8c6d8; }
  a { color: #9ec5ff; }
  footer { border-color: #334257; }
}