<div class="login">
    <form name="login">
        <div class="login-titulo">
            <span>Ingreso de usuario</span>
        </div>
        <div class="login-campo">
            <label>Usuario</label>
            <input
                type       = "text"
                ng-model   = "usuario.idUsuario"
                foca-focus = "paso == 1"
                ng-keyup   = "$event.keyCode == 13 && irPaso(2)"
            />
        </div>
        <div class="login-campo">
            <label>Contraseña</label>
            <input
                type       = "password"
                ng-model   = "usuario.clave"
                foca-focus = "paso == 2"
                ng-keyup   = "$event.keyCode == 13 && enviar()"
            />
        </div>
    </form>
</div>