.ddt-tool {
  max-width: 800px;
  margin: 20px auto;
  font-family: Arial, sans-serif;
}
.ddt-tool h3 {
  margin-bottom: 10px;
}
.ddt-tool textarea {
  width: 100%;
  height: 150px;
  margin-bottom: 15px;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 6px;
  resize: vertical;
}
.ddt-tool select,
.ddt-tool input[type="number"] {
  margin-bottom: 10px;
  padding: 5px;
}