body {
  margin: 0;
  padding: 0;
  width: 340px;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
}

.container {
  padding: 16px;
}

h2 {
  margin-top: 0;
}

textarea {
  width: 100%;
  height: 180px;
  resize: vertical;
  font-family: monospace;
  font-size: 13px;
  padding: 10px;
  box-sizing: border-box;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  width: 100%;
  margin-top: 12px;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: black;
  color: white;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  opacity: 0.9;
}

.hint {
  margin-top: 10px;
  font-size: 12px;
  color: #666;
  white-space: pre-line;
}