.book-intro {
  max-width:750px;
}

        .pdf-block {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 10px;
            background-color: #f8f9fa;

            max-width: 400px;
            margin: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);

        }
        


        
        .pdf-icon {
            color: #d32f2f;
            font-size: 28px;
        }
        
        .pdf-link {
            flex-grow: 1;
            text-align: left;
            color: #0066cc;
            text-decoration: none;
        }
        
        .pdf-link:hover span{
            color: #004499;
            border-bottom: 1px solid var(--hover-white);
        }
        
        .pdf-link i {
            margin-left: 8px;
            font-size: 14px;
        }