body {
    background-color: #f8f9fa;
}
.doc-thumbnail {
    height: 200px;
    object-fit: cover;
}
.card {
    border: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.navbar-brand {
    font-weight: bold;
}
.table tr[onclick] {
    cursor: pointer;
}
@media (max-width: 768px) {
    .doc-thumbnail {
        height: 150px;
    }
    .container-fluid {
        padding: 0.5rem;
    }
}