pandas DataFrame column manipulation using previous row value

Question

I have below pandas DataFrame

color	direction	Total
-1.0	1.0	NaN
1.0	1.0	0
1.0	1.0	0
1.0	1.0	0
-1.0	1.0	NaN
1.0	-1.0	NaN
1.0	1.0	0
1.0	1.0	0

I am trying to update the total column based on below logic.

if df['color'] == 1.0 and df['direction'] == 1.0 then Total should be Total of previous row + 1. if Total of previous row is NaN, then 0+1

Note: I was trying to read the previous row total using df['Total'].shift() + 1 but it didnt work.

Expected DataFrame.

color	direction	Total
-1.0	1.0	NaN
1.0	1.0	1
1.0	1.0	2
1.0	1.0	3
-1.0	1.0	NaN
1.0	-1.0	NaN
1.0	1.0	1
1.0	1.0	2