body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 0;
  line-height: 1.5;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
}

.site-header {
  border-bottom: 1px solid #ddd;
  background: #fff;
  position: sticky;
  top: 0;
}

.brand {
  font-weight: 700;
  text-decoration: none;
  color: #111;
  margin-right: 18px;
}

.nav a {
  margin-right: 12px;
  text-decoration: none;
  color: #111;
}

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