:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #17212b;
  background: #f5f7fa;
}

* { box-sizing: border-box; }

body { margin: 0; }

nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding: 1rem max(1.25rem, calc((100vw - 760px) / 2));
  background: #fff;
  border-bottom: 1px solid #dce3ea;
}

nav strong { margin-right: auto; }

a { color: #0759c7; }

main {
  width: min(760px, calc(100% - 2rem));
  margin: 3rem auto;
  padding: 2rem;
  background: #fff;
  border: 1px solid #dce3ea;
  border-radius: 16px;
  box-shadow: 0 12px 32px rgba(25, 40, 55, 0.08);
}

h1 { margin-top: 0; }

p, li { line-height: 1.7; }

.button {
  display: inline-block;
  padding: .75rem 1rem;
  border-radius: 8px;
  background: #0759c7;
  color: #fff;
  text-decoration: none;
  font-weight: 650;
}

.muted { color: #52606d; }

@media (max-width: 640px) {
  nav { flex-wrap: wrap; }
  nav strong { width: 100%; }
  main { margin: 1.5rem auto; padding: 1.25rem; }
}