.container {
    
    padding: 30px;
    border-radius: 10px;
    
}

h1 {
    color: #212121;
    text-align: center;
    margin-bottom: 30px;
}

.upload-area {
    border: 2px dashed #fbc500;
    border-radius: 5px;
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.upload-area:hover {
    background: #f7f9fc;
    border-color: #ee9300;
}

#fileInput {
    display: none;
}

.upload-btn {
    background: #fbc500;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.upload-btn:hover {
    background: #ee9300;
}

#preview {
    margin-top: 20px;
    text-align: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.preview-item {
    position: relative;
    display: inline-block;
    cursor: grab;
}

.preview-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

#preview img {
    max-width: 200px;
    max-height: 200px;
    border: 2px solid #ddd;
    border-radius: 5px;
    padding: 5px;
}

#convertBtn {
    display: block;
    width: 100%;
    background: #2ecc71;
    color: white;
    padding: 15px;
    border: none;
    border-radius: 5px;
    margin-top: 20px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

#convertBtn:hover {
    background: #27ae60;
}

.loading {
    display: none;
    margin: 20px auto;
}

.loading:after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.page-size-selector {
    margin: 10px 0;
    padding: 10px;
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}