My crush is NB, how can I flirt with them?

Hi, I’m a 21F bi college student. In one of my classes, there’s this person I have a huuugeee crush on. The only time I’ve talked to them, I asked for their Insta and noticed they use they/them pronouns. I don’t mind at all that they’re NB, but I really want to get to know them better and make my "flirting" clear without making them uncomfortable. I want to give them compliments without sounding fake or stereotypical. They are so, so, so gorgeous and have the prettiest eyes I’ve ever seen—they’re just generally so physically attractive. They make me so nervous, and I really don’t want to mess it up by saying something wrong by accident or making them feel as if I see them as woman or man, when I don't . Also, we’re in Mexico, and they’re an exchange student from USA, they speak spanish and used it when speaking to me even tho I aproached in english. For context, everything in Spanish is gendered, and it makes complimenting them harder. Any advice? (Sorry for the English, it’s not my first language.)