body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

.container {
  width: 95%;
  max-width: 800px;
  margin: 20px auto;
  background-color: #fff;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
  .container {
    width: 100%;
    padding: 10px;
    margin: 10px auto;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .controls > * {
    width: 100%;
    margin-bottom: 10px;
  }

  .preview-container {
    flex-direction: column;
    height: auto;
  }

  .source-preview,
  .translation-preview {
    width: 100%;
    height: auto;
    margin-bottom: 20px;
  }
}

h1 {
  text-align: center;
  color: #333;
}

.controls {
  margin-bottom: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.controls > * {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

#file-input {
  flex: 1;
}

#target-language {
  width: 100px;
}

#translate-button,
#download-button {
  background-color: #007bff;
  color: #fff;
  cursor: pointer;
  border: none;
}

#translate-button:hover,
#download-button:hover {
  background-color: #0056b3;
}

.preview-container {
  display: flex;
  height: 400px;
}

.source-preview,
.translation-preview {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  border: 1px solid #ccc;
}

.source-preview h2,
.translation-preview h2 {
  text-align: center;
  margin-bottom: 10px;
}

#source-content,
#translation-content {
  white-space: pre-wrap;
}