body {
      font-family: Arial, sans-serif;
      background: #f4f4f4;
      margin: 0;
      padding: 2rem;
    }

    .container {
      max-width: 800px;
      margin: auto;
      background: white;
      padding: 2rem;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    h1 {
      text-align: center;
    }

    #search {
      width: 100%;
      padding: 10px;
      margin-bottom: 1rem;
      border-radius: 5px;
      border: 1px solid #ccc;
    }

    #category-filter {
      width: 100%;
      padding: 10px;
      margin-bottom: 1rem;
      border-radius: 5px;
      border: 1px solid #ccc;
    }

    ul {
      list-style: none;
      padding: 0;
    }

    li {
      margin: 0.8rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    a.download-link {
      text-decoration: none;
      color: #007BFF;
      font-weight: bold;
    }

    a.download-link:hover {
      color: #0056b3;
    }

    .preview-btn {
      background: #eee;
      border: none;
      padding: 5px 10px;
      cursor: pointer;
      border-radius: 5px;
      margin-left: 10px;
    }

    .modal {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.7);
      justify-content: center;
      align-items: center;
    }

    .modal-content {
      width: 80%;
      height: 90%;
      background: white;
      padding: 10px;
      border-radius: 10px;
      position: relative;
    }

    .modal-content iframe {
      width: 100%;
      height: 100%;
      border: none;
    }

    .close-modal {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 20px;
      cursor: pointer;
    }