body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f5f5f5;
}
#dropzone {
  width: 400px;
  height: 200px;
  border: 3px dashed #888;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #fff;
  text-align: center;
  color: #666;
  transition: border 0.3s;
}
#dropzone.dragover {
  border-color: #007bff;
  color: #007bff;
}
#output {
  margin-top: 20px;
  white-space: pre-wrap;
  font-size: 14px;
  color: #333;
}