body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #7F7FD5, #86A8E7, #91EAE4);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  color: #333;
}

.quiz-container {
  background: rgba(255,255,255,0.9);
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  padding: 30px;
  width: 90%;
  max-width: 400px;
  text-align: center;
}

h1 {
  margin-bottom: 20px;
  color: #2C3E50;
}

.btn-grid {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
}

button {
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  opacity: 0.8;
}

.answer-btn {
  background-color: #3498db;
  color: white;
}

.next-btn, .restart-btn {
  background-color: #2ecc71;
  color: white;
  font-weight: bold;
}

.correct { background-color: #2ecc71 !important; }
.wrong { background-color: #e74c3c !important; }