body { 
  font-family: Arial, sans-serif; 
  background: #f7f7f7; 
  text-align: center; 
  padding: 20px; 
}

h2 { color: #333; }

.quiz-card {
  background: #fff;
  padding: 20px;
  margin: 20px auto;
  border-radius: 15px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  max-width: 420px;
}

/* ✅ 글자 크기 약간 축소 + 굵기 강화 */
.letter-box { 
  font-size: 55px;
  font-weight: 1600;
  margin: 10px 0; 
  color: #222;
  letter-spacing: 2px;
}

.roman-box { 
  font-size: 22px; 
  color: #666; 
  margin-bottom: 20px; 
}

.option-row { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  margin: 8px 0; 
}

button {
  flex: 1; 
  margin: 0 5px; 
  padding: 12px; 
  font-size: 16px; 
  border: none;
  border-radius: 10px; 
  cursor: pointer; 
  transition: 0.3s;
}

.answer-btn { background: #87cefa; }
.answer-btn:hover { background: #4682b4; color: #fff; }

.sound-btn { background: #ffb347; max-width: 80px; }
.sound-btn:hover { background: #ff8c00; color: #fff; }

.result { margin-top: 15px; font-size: 18px; font-weight: bold; }

#nextBtn { display: none; margin-top: 15px; background: #90ee90; }
#nextBtn:hover { background: #2e8b57; color: #fff; }