body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }
  .screen {
    display: none;
    text-align: center;
    padding: 20px;
    border-radius: 15px;
    background-color: #ffffff;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 500px;
  }
  .screen.active { display: block; }
  h1, h2, h3 { color: #333; }
  .btn {
    background-color: #a8dadc;
    border: none;
    padding: 10px 20px;
    margin: 10px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
    color: #000;
    text-decoration: none;
  }
  .btn:hover { background-color: #457b9d; color: #fff; }
  .btn-grid { display: flex; flex-direction: column; }
  .btn-grid button { margin: 5px 0; }
  .score { position: absolute; top: 20px; right: 20px; font-size: 18px; background-color: #ffe066; padding: 5px 10px; border-radius: 8px; }
  .timer { position: absolute; top: 20px; left: 20px; font-size: 18px; background-color: #ff6b6b; padding: 5px 10px; border-radius: 8px; color: #fff; }
  input[type="text"] { padding: 8px; border-radius: 8px; border: 1px solid #ccc; margin-bottom: 10px; width: 80%; }
  ul { list-style: none; padding: 0; margin: 0; }
  li { background-color: #f1faee; margin: 5px 0; padding: 8px; border-radius: 8px; font-weight: bold; }
  .senac-logo { width: 150px; margin-bottom: 20px; display: block; margin-left: auto; margin-right: auto; }
  .question-image { width: 200px; margin: 10px 0; border-radius: 10px; }