# Spec Delta

## Purpose

Permite vender cómodamente desde celulares mostrando el carrito, la búsqueda de productos y la devuelta sin obligar a recorrer una lista larga.

## ADDED Requirements

### Requirement: Catálogo compacto en POS
The system SHALL keep the cart visible and allow selecting products through a searchable compact list or dialog.

#### Scenario: Selección en móvil
- **WHEN** user opens Ventas on a narrow viewport
- **THEN** the cart and total remain visible
- **AND** user can search and add a product from the catalog dialog

### Requirement: Calcular devuelta
The system SHALL calculate and display change for cash payments before saving a sale.

#### Scenario: Pago en efectivo
- **GIVEN** sale total is 12000
- **WHEN** user enters 20000 as received cash
- **THEN** the UI displays change of 8000
- **AND** the sale can be confirmed

#### Scenario: Efectivo insuficiente
- **WHEN** received cash is below the sale total
- **THEN** confirmation is disabled and an actionable message is shown