/* 设置整个页面的背景为天蓝色 */
body {
  font-family: Arial, sans-serif;
  background: #87CEEB;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  font-size: 18px;
}

h1 {
  text-align: center;
  color: #fff;
  font-size: 36px;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

#question-container {
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 30px;
  margin-bottom: 30px;
  width: 80%;
  max-width: 600px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#question-text {
  margin-top: 0;
  font-size: 22px;
}

/* 选项按钮样式 */
.option-btn {
  background-color: #f0f0f0;
  border: 2px solid #ccc;
  border-radius: 5px;
  color: #333;
  padding: 10px 20px;
  margin-bottom: 10px;
  font-size: 18px;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: all 0.3s ease;
}

.option-btn:hover {
  background-color: #e0e0e0;
  border-color: #999;
}

.option-btn:disabled {
  background-color: #f8f8f8;
  border-color: #eee;
  color: #999;
  cursor: not-allowed;
}

.feedback {
  display: block;
  margin-top: 15px;
  font-size: 18px;
}

.correct {
  color: green;
}

.incorrect {
  color: red;
}

.correct-answer {
  color: green;
  font-weight: bold;
}

#score-container p {
  font-size: 22px;
  color: #fff;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}