body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  margin: 0;
  color: #222222;
  background: #ffffff;
}

header,
main,
footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
}

h1,
h2,
h3 {
  margin: 0.5rem 0;
}

p {
  margin: 0.45rem 0;
}

.card {
  background: #f7f9fc;
  border: 1px solid #e6eef9;
  border-radius: 12px;
  padding: 1rem;
  margin: 1rem 0;
}

nav a,
.card a {
  color: #1558d6;
  text-decoration: none;
  margin: 0 0.4rem;
}

nav a:hover,
.card a:hover {
  text-decoration: underline;
}

ul {
  margin: 0.5rem 0;
  padding-left: 1.4rem;
}

.footer-note {
  margin-top: 0.6rem;
}