.file-drop-zone {
            border: 2px dashed #ced4da;
            border-radius: 12px;
            padding: 2rem;
            text-align: center;
            background-color: #f8f9fa;
            transition: all 0.2s ease;
            cursor: pointer;
        }
        .file-drop-zone:hover {
            border-color: var(--primary-color);
            background-color: rgba(70, 130, 180, 0.03);
        }
        .preview-card {
            background: #fef9e6;
            border-left: 4px solid #ffc107;
            height: 100%;
        }
        .split-summary {
            background-color: #e9ecef;
            border-radius: 8px;
            padding: 1rem;
        }
        .split-item {
            background: white;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 0.75rem 1rem;
            margin-bottom: 0.6rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .split-filename {
            font-family: 'Courier New', monospace;
            font-weight: 600;
        }
        .split-stats {
            font-size: 0.85rem;
            color: #6c757d;
        }
        .badge-csv {
            background-color: #28a745;
            color: white;
        }
        .example-data-btn {
            background-color: #f0f2f5;
            border: 1px solid #cfd9e6;
        }
        .warning-notice {
            background-color: #fff3cd;
            border-left: 4px solid #ffc107;
        }
        .settings-section {
            background-color: #f8f9fa;
            border-radius: 10px;
            padding: 1.25rem;
            height: 100%;
        }