Look, not every sweltering-hot summer day calls for a hard seltzer or refreshing shandy (we're looking at you, Giada De Laurentiis). Sometimes, a bright, fresh cocktail is just what the day calls for; and according to Pinterest's July trends, that's exactly what we'll find — and more. "With summer in full swing and many bars closed, cocktail mixology is clearly the most chill DIY trend of the season," the trend report states. Take one quick scroll through Pinterest for cocktail recipes, and…