body {
  font-family: 'Arial', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #333;
}

.quiz-container {
  background: white;
  padding: 2.5rem;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  width: 90%;
  max-width: 600px;
  text-align: center;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.score {
  text-align: center;
  margin: 1.5rem 0;
  font-size: 1.4rem;
  font-weight: bold;
  color: #444;
}

.questions-container {
  font-size: 1.3rem;
  margin-bottom: 2rem;
  color: #555;
}

.options-container {
  margin: 2rem 0;
}

button {
  display: block;
  width: 100%;
  padding: 1rem;
  margin: 0.75rem 0;
  border: none;
  border-radius: 8px;
  background-color: #007bff;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
}

button:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

#restart {
  background-color: #28a745;
  margin-top: 1.5rem;
}

#restart:hover {
  background-color: #218838;
}

.options-container button {
  background-color: #f0f2f5;
  color: #333;
  border: 1px solid #ddd;
}

.options-container button:hover {
  background-color: #007bff;
  color: white;
  border-color: #007bff;
}

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

.incorrect {
  background-color: #dc3545 !important;
  color: white !important;
  border-color: #dc3545 !important;
}