body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: #f3f4f6;
  margin: 0;
  padding: 24px;
}

.card {
  max-width: 720px;
  margin: 0 auto 16px;
  background: #ffffff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

h1 {
  margin-top: 0;
  font-size: 22px;
  color: #111827;
}

.nav {
  font-size: 14px;
  margin-bottom: 8px;
}

.nav a {
  color: #2563eb;
  text-decoration: none;
  margin-right: 12px;
}

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