body {
  font-family: sans-serif;
  padding: 20px;
  background: #f9f9f9;
}
h1 {
  color: #d60000;
  margin-bottom: 10px;
}
.category-section {
  margin-bottom: 30px;
}
h2 {
  color: #222;
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 1.2em;
}
.engine-button {
  display: inline-block;
  padding: 10px 16px;
  margin: 5px 4px 5px 0;
  background-color: #111;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-size: 1em;
  transition: background 0.2s;
}
.engine-button:hover {
  background-color: #d60000;
}