Vi konsideras vin feliĉa aŭ Vi konsideras vin feliĉan
I am rather confused what case to use between the nominative and the accusative. In Russian you use the instrumental: ты считаешь себя счастлив-ым/ой. But since there's no instrumental in Esperanto, it's not possible. I'd appreciate it if you can explain me what to use and why.