Did something VERY stupid ...Have i wrecked my Yaris?

[Stabilo]

folks,

Hope someone can help... went to jump start my 2000 Yaris and didnt realise i had the lead on the wrong battery poles (idiot!) ...reverse polarisation i believe its called ...there was a few sparks with car starting up then it died and no electrics are working at all!!

Im hoping i've just blown fuses? or have i done something much worse??

I replaced 2 of the small sized fues (15 amp) in fuse box beside the battery that i could see had blown but that hasnt made a difference.

Would i have blown the main fuse and where is this located?

Any help really appreciated, feel silly enough for doing this + cant afford to be spending big money fixing it.