I already spent some money on it 
Got an e-mail today that a 30% deposit is required to be able to sell it. So, the money I invested - gone?
Yes, it is. Gone. Got an e-mail today that a 30% deposit is required to be able to sell it. So, the money I invested - gone?That is a classic scam technique, to ask for more funds in an attempt of withdrawal, and I'm sure they will keep doing that if you somehow obey what they tell to you to do.
I've tried to open the site, and all the look is pretty freaking fubar. How could you believe those things?
Other than asking for more funds, you stated in OP, that you are being pushed. That in a sense is an urgency, which is another thing of a classic scam.
As of now, there is nothing you can do but learn from it. And try to comprehend some of the threads that gives you some advice about how to protect yourself from being scammed here: https://bitcointalk.org/index.php?topic=5364418.msg58120908#post_point151