:root {
  font-family: Arial, Helvetica, sans-serif;
  color: #222;
  background: #f7f7f7;
}
body {
  margin: 0;
  padding: 0;
}
main {
  max-width: 860px;
  margin: 40px auto;
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
h1 {
  margin-top: 0;
  color: #1f2937;
}
h2 {
  margin-top: 28px;
  color: #374151;
}
p, li {
  line-height: 1.6;
}
nav {
  margin-bottom: 24px;
}
nav a {
  margin-right: 16px;
  color: #2563eb;
  text-decoration: none;
}
footer {
  margin-top: 32px;
  font-size: 0.9rem;
  color: #666;
}