body {
  font-family: Arial, sans-serif;
  background-color: #f7f7f7;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

#app {
  width: 90%;
  max-width: 600px;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2 {
  text-align: center;
}

#question-container {
  display: none;
  flex-direction: column;
  align-items: center;
}

#question {
  font-size: 18px;
  margin-bottom: 20px;
}

#answer-buttons {
  list-style: none;
  padding: 0;
}

#answer-buttons li {
  margin: 5px 0;
}

#answer-buttons button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

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

#timer {
  margin-top: 20px;
}

button#start-btn, button#restart-btn {
  background-color: #28a745;
  color: #fff;
  font-size: 16px;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  display: block;
  margin: 0 auto;
}

button#start-btn:hover, button#restart-btn:hover {
  background-color: #218838;
}

#hint {
  margin-top: 10px;
  font-style: italic;
  color: #555;
}

.correct {
  background-color: #28a745 !important;
}

.wrong {
  background-color: #dc3545 !important;
}