.file-drop-zone {
    border: 2px dashed #c7c7c7;
    border-radius: 4px;
    padding: 8px;
    cursor: pointer;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.file-drop-zone.file-drop-over {
    border-color: #337ab7;
    background-color: rgba(51, 122, 183, 0.08);
}

.file-drop-zone .file-drop-hint {
    color: #999;
    font-size: 0.9em;
    text-align: center;
    padding: 12px;
}