Help me save this baby orchid please

[rbarata]

Perlite and sphagnum are water retentive. With that propotion (50 %) it might be suffocating the roots (they need humid air around them).
I would keep the perlite and reduce the sphagnum to 20%. I would also increase the bark size as it seems to be too small.
I don't know where you live in Spain but my summers have hot temps and day humidity often as low as 15%. I use only coarse bark or a mix of bark+LECA +Perlite or coco chips and the plants can handle it very well. The "secret" in this environment is to increase watering.