.upload-area {
    border: 2px dashed #aaa;
    border-radius: 12px;
    width: 400px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 10px;
    background-color: #fafafa;
    transition: border-color 0.3s, background-color 0.3s;
    cursor: pointer;
    margin: 50px auto;
    text-align: center;
    font-family: sans-serif;
  }

  .upload-area.dragover {
    border-color: #007bff;
    background-color: #eef6ff;
  }

  .run-btn {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
  }

  .run-btn:hover {
    background-color: #0056b3;
  }