.drop-zone {
            border: 2px dashed #ccc;
            border-radius: 12px;
            background: #fafcff;
            padding: 2rem 1rem;
            text-align: center;
            transition: all 0.2s ease;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .drop-zone.drag-over {
            background-color: #e9f5ff;
            border-color: var(--primary-color);
        }
        .file-info {
            background-color: #f0f4f8;
            border-radius: 8px;
            padding: 0.8rem 1rem;
            margin: 1rem 0;
        }
        .csv-preview {
            background: #fefefe;
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 1rem;
            max-height: 400px;
            overflow: auto;
            font-family: 'Courier New', 'SF Mono', monospace;
            font-size: 0.85rem;
            white-space: pre-wrap;
            word-break: break-all;
        }
        .stats-badge {
            background: #eef2fa;
            border-radius: 30px;
            padding: 0.3rem 0.9rem;
            font-size: 0.8rem;
            font-weight: 500;
            display: inline-block;
        }
        .action-buttons .btn {
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .sheet-selector {
            max-width: 280px;
        }
        .conversion-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
        }
        .result-header {
            background: #f8fafd;
            border-radius: 12px 12px 0 0;
            padding: 0.8rem 1.2rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .excel-icon-color {
            color: #1d6f42;
        }