body {
      background: #f5f7fa;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      margin: 0;
      padding: 2rem;
      color: #333;
    }

    .markdown-body {
      max-width: 900px;
      margin: 0 auto;
      background: #fff;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
      padding: 2rem;
    }

    .nav-buttons {
      margin-bottom: 2rem;
    }

    .nav-buttons button,
    #quiz-container button,
    #results-tabs button {
      padding: 0.6rem 1.2rem;
      margin: 1rem 0.5rem 0 0;
      font-size: 1rem;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      transition: background-color 0.2s ease;
    }

    .nav-buttons button,
    #quiz-container button {
      background-color: #007BFF;
      color: white;
    }

    #quiz-container button:hover {
      background-color: #0056b3;
    }

    #submit-btn {
      background-color: #28a745;
    }

    #submit-btn:hover {
      background-color: #1e7e34;
    }

    .choice {
      margin-bottom: 0.75rem;
    }

    .choice label {
      display: block;
      padding: 0.6rem 1rem;
      border: 1px solid #ccc;
      border-radius: 8px;
      cursor: pointer;
      background-color: #f9f9f9;
      transition: background-color 0.2s ease;
    }

    .choice label:hover {
      background-color: #f1f1f1;
    }

    input[type="radio"] {
      margin-right: 0.5rem;
    }

    .results-tab {
      background: #ffffff;
      padding: 2rem;
      border-radius: 10px;
      margin-top: 2rem;
      border: 1px solid #e0e0e0;
    }

    .results-tab li {
      margin-bottom: 1rem;
      line-height: 1.5;
    }

    #results-tabs {
      margin-top: 2rem;
    }

    #results-tabs button {
      background-color: #e0e0e0;
      color: #333;
      border: 1px solid #ccc;
    }

    #results-tabs button:hover {
      background-color: #d0d0d0;
    }
    #total-timer {
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: #007BFF;
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 9999;
    }
    .tab-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tab-buttons button {
  padding: 0.6rem 1.4rem;
  background-color: #007BFF;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.tab-buttons button:hover {
  background-color: #0056b3;
}

#retry-btn {
  display: block;
  margin: 2rem auto 0;
  padding: 0.6rem 1.4rem;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#retry-btn:hover {
  background-color: #1e7e34;
}