.dropzone {
    border: 2px dashed #ccc;
    border-radius: 4px;
    padding: 20px;
    text-align: center;
    background: #f9f9f9;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.dropzone.dragover {
    background: #e1e1e1;
    border-color: #999;
}

.folder-list {
    margin-top: 20px;
}

.folder-item {
    padding: 10px;
    border: 1px solid #ddd;
    margin-bottom: 10px;
    border-radius: 4px;
    background: #fff;
}

.folder-actions {
    float: right;
}

.download-history {
    margin-top: 30px;
}

.card {
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.card-header {
    background-color: #f8f9fa;
}

.breadcrumb {
    background-color: transparent;
    padding: 0;
    margin-bottom: 20px;
}