#drop-area {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin: 20px auto;
    max-width: 600px;    
}
#drop-area.highlight {
    border-color: #4CAF50;
    background-color: #f0fff0;
}
#file-input {
    display: none;
}
.upload-btn {
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
#preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}
.thumbnail {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border: 1px solid #ddd;
    border-radius: 4px;
}
.progress-container {
    width: 100%;
    background-color: #f1f1f1;
    border-radius: 4px;
    margin-top: 10px;
}
.progress-bar {
    height: 30px;
    background-color: #4CAF50;
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s;
}