body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f9;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .container {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    text-align: center;
  }
  
  h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
  }
  
  input[type="file"] {
    margin-bottom: 1rem;
  }
  
  button {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
  }
  
  button:hover {
    background: #0056b3;
  }
  
  .progress-container {
    width: 100%;
    background: #e0e0e0;
    border-radius: 5px;
    margin: 1rem 0;
    overflow: hidden;
  }
  
  .progress-bar {
    width: 0;
    height: 10px;
    background: #007bff;
    transition: width 0.5s ease;
  }
  
  .results {
    margin-top: 2rem;
    text-align: left;
  }
  
  #mistakesList, #suggestionsList {
    list-style-type: disc;
    padding-left: 1.5rem;
  }
  
  #mistakesList li {
    color: #d9534f;
    margin-bottom: 0.5rem;
  }
  
  #suggestionsList li {
    color: #5cb85c;
    margin-bottom: 0.5rem;
  }