"Tan" means several different things in English.
For the general color (similar to beige), the word used in Spanish is "castaño" which means "chestnut".
For someone who's skin has darkened due to exposure to the sun, the word use in Spanish is "bronceado", which means "bronzed". The act of "tanning" in this way is "broncearse".
For the act of curing leather, the Spanish word is "curtir".
I like your tan= in Spanish Quiero su bronceado
eres tan dulce
no tan grande...?
espero tan
"Si tan sólo..."
Para hacer tan.
Tan verdad
Tan cruel.
bronceado falso
tan agradable
Yo no soy tan bueno or no soy tan bueno
To a female you say, "Tú eres tan bonita." To a male, "Tú eres tan bonito."