.paper-container {
        max-width: 900px;
        margin: 2rem auto;
        padding: 1rem;
      }
      .back-link {
        display: inline-block;
        margin-bottom: 1rem;
      }
      .post-meta {
        color: #666;
        font-size: 0.95rem;
        margin-bottom: 1rem;
      }
      .keywords {
        color: #333;
        font-size: 0.95rem;
        margin: 0.5rem 0 1.5rem;
      }
      .post h2 {
        margin-top: 1.25rem;
      }