body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.question-card {
  background-color: #2f5597;
  color: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}
.answer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin-bottom: 20px;
}
.option, .answer {
  background: #eef3fb;
  padding: 15px;
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: 0.2s;
  font-weight: bold;
  color: #000;
}
.option:hover {
  border-color: #2f5597;
}
.option.selected {
  background-color: #2f5597;
  color: white;
}
.answer.correct {
  background-color: #d4edda;
  border: 2px solid #28a745;
}
.answer.incorrect {
  background-color: #f8d7da;
  border: 2px solid #dc3545;
}
.answer.correct-answer {
  background-color: #d4edda;
  border: 2px solid #28a745;
}
.navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}
.navigation button {
  padding: 10px 20px;
  background-color: #2f5597;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.hidden {
  display: none;
}