body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0 1rem;
  color: #333;
}
header, section, footer {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1.5rem;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1, h2 {
  color: #3b3b3b;
}
a {
  color: #ac3b3b;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
dl dt {
  font-weight: bold;
  margin-top: 1rem;
}
ul {
  padding-left: 1.5rem;
}
footer {
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}