/* TOCページ専用のスタイル */
.toc-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 2rem;
}

.toc-card {
  background-color: #f8f9fa;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  color: #333;
}

.toc-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.toc-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #2c3e50;
  font-size: 1.2rem;
}

.toc-card h3 a {
  color: #2c3e50;
  text-decoration: none;
  display: block;
}

.toc-card h3 a:hover {
  color: #3498db;
}

.toc-card p {
  margin: 0;
  color: #666;
  font-size: 0.9rem;
}

/* モバイル向け調整 */
@media (max-width: 768px) {
  .toc-container {
    grid-template-columns: 1fr;
  }
  
  .toc-card {
    padding: 15px;
  }
  
  nav ul {
    flex-direction: column;
    padding: 0;
  }
  
  nav li {
    margin: 5px 0;
    width: 100%;
  }
  
  nav a {
    display: block;
    padding: 10px;
    text-align: center;
    background-color: #f5f5f5;
    border-radius: 5px;
  }
  
  nav a:hover {
    background-color: #e0e0e0;
  }
}