/* Стили ТОЛЬКО для страницы загрузки */
.drop-area {
    border: 2px dashed #3498db;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    background: #f2f6fa;
    cursor: pointer;
    transition: background 0.3s;
    margin: 15px 0;
}
.drop-area.highlight {
    background: #d4e9ff;
    border-color: #005a87;
}
.drop-area p {
    margin: 10px 0;
    color: #555;
}

.preview-container {
    margin: 20px 0;
    border: 1px solid #ddd;
    border-radius: 8px;
    display: none;
}
.preview-container.visible {
    display: block;
}
#filePreview {
    width: 100%;
    height: 500px;
    border: none;
}
.preview-message {
    padding: 20px;
    text-align: center;
    color: #7f8c8d;
    background: #f8f9fa;
}

#fileInput {
    display: none;
}

.loading {
    display: none;
    text-align: center;
    padding: 20px;
}
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007cba;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}