body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 20px;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1em;
}

.add-link {
  text-decoration: none;
  background: #28a745;
  color: white;
  padding: 6px 6px;
  border-radius: 4px;
  font-size: 0.9rem;
}

ul.category-list {
  list-style: none;
  padding: 0;
}

ul.category-list li {
  background: #fff;
  border: 1px solid #ddd;
  padding: 10px;
  margin-bottom: 2px;
  border-radius: 4px;
}

ul.category-list li a {
  text-decoration: none;
  color: #007bff;
  font-weight: 500;
}

ul.category-list li a:hover {
  text-decoration: underline;
}