.section {
      background-color: white;
      border-radius: 10px;
      padding: 20px;
      margin: 20px auto;
      max-width: 900px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }

.volume {
      border-left: 5px solid #007bff;
      padding: 15px;
      margin-bottom: 10px;
      background-color: #fefefe;
      border-radius: 5px;
    }

.archived-volume {
      border-left-color: #888;
      background-color: #f7f7f7;
    }

.vol-header {
      font-weight: bold;
      margin-bottom: 8px;
      color: #222;
    }

ul.topic-list {
      padding-left: 20px;
    }

ul.topic-list li {
      margin-bottom: 5px;
    }

ul.topic-list a {
      color: #007bff;
      text-decoration: none;
    }

ul.topic-list a:hover {
      text-decoration: underline;
    }

    @media (max-width: 600px) {
      nav ul {
        flex-direction: column;
        align-items: center;
      }

      nav li {
        margin: 5px 0;
      }

      body {
        padding: 10px;
      }
    }