body {
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

#quiz-container {
  width: 100%;
  max-width: 420px;
  background: #ffffff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

#progress-bar {
  width: 100%;
  height: 8px;
  background: #eee;
  border-radius: 5px;
  margin-bottom: 20px;
}

#progress-fill {
  height: 100%;
  width: 33%;
  background: #4CAF50;
  border-radius: 5px;
  transition: width 0.3s ease;
}

.quiz-step {
  display: none;
}

.active-step {
  display: block;
}

.quiz-question-text {
  font-size: 20px;
  margin-bottom: 20px;
}

.quiz-option-button {
  display: block;
  width: 100%;
  padding: 14px;
  margin-bottom: 10px;
  border: 2px solid #ddd;
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s ease;
}

.quiz-option-button:hover {
  border-color: #4CAF50;
  background: #f0fff4;
}