.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0,0,0,0.1);
    padding: 16px;
    margin-bottom: 20px;
    max-width: 800px;
    font-family: Georgia, serif;
  }

  .article-type {
    font-weight: bold;
    color: #555;
    margin-bottom: 8px;
  }

  .title {
    font-size: 18px;
    font-weight: 500;
    color: #0074e4;
    text-decoration: none;
    line-height: 1.4;
    display: block;
    margin-bottom: 10px;
  }

  .authors {
    color: #555;
    margin-bottom: 6px;
  }

  .doi {
    font-size: 14px;
    margin-bottom: 10px;
  }

  .doi a {
    color: #0074e4;
    text-decoration: none;
  }

  .buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }

  .btn {
    padding: 8px 12px;
    font-size: 14px;
    border: none;
    border-radius: 4px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
  }

  .btn-abstract {
    background-color: #003d6a;
  }

  .btn-html {
    background-color: #d4632a;
  }

  .btn-pdf {
    background-color: #e00000;
  }

  .btn::before {
    content: '📄';
  }