.dropzone {
    width: 100%;
    max-width: 320px;
    height: 180px;
    border: 2px dashed #aaa;
    border-radius: 10px;
    background: #fafafa;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #666;
    cursor: pointer;
    transition: 0.2s;
    overflow: hidden;
    position: relative;
}

.dropzone.dragover {
    border-color: #4caf50;
    background: #f1fff3;
    color: #2e7d32;
}

.dropzone .preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: none;
}