Mix graham cracker crumbs with melted butter and sugar.
Press mixture firmly into springform pan bottom.
Refrigerate crust for 30 minutes until set completely.
Beat cream cheese until smooth and fluffy texture forms.
Add powdered sugar and mix until well combined thoroughly.
Pour in lime juice and zest, mixing gently.
Whip heavy cream until soft peaks form naturally.
Fold whipped cream into cream cheese mixture carefully.
Spread cheesecake layer over prepared crust evenly.
Whip mousse ingredients until light and airy texture.
Add food coloring if desired for vibrant appearance.
Spread mousse layer over cheesecake layer smoothly.
Refrigerate for 4 hours until completely set firm.
Remove from springform pan before serving guests.