body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f4f7f6;
  color: #333;
  padding: 20px;
}

#content {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.quiz-box {
  margin-bottom: 30px;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.option-label {
  display: block;
  padding: 8px;
  cursor: pointer;
}

.result-text {
  font-weight: bold;
  font-size: 1.2em;
}

.correct { color: #27ae60; }
.incorrect { color: #c0392b; }

.answer-box {
  background-color: #e8f6f3;
  padding: 15px;
  border-left: 5px solid #27ae60;
  margin-top: 10px;
}

button {
  background-color: #3498db;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1em;
}

button:hover {
  background-color: #2980b9;
}

/* リストのスタイルをカードデザイン風に統一 */
.sport-list {
  list-style: none;
  padding: 0;
}

.sport-list li {
  margin-bottom: 15px;
}

.sport-list li a {
  display: block;
  padding: 20px;
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  text-decoration: none;
  color: #333;
  font-size: 1.2em;
  font-weight: bold;
  transition: all 0.3s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.sport-list li a:hover {
  background-color: #f0f7ff;
  border-color: #3498db;
  color: #3498db;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}