Modern minimalism, with a wickedly sexy undertone, made a strong statement on the Paris catwalks. Valentino (left), Chloé (middle), Balenciaga (right) Lovely little details—from pretty pastels at Dior to rows of ruffles at Valentino—lightened up all the black, brown, and gray. Lovely little details—from pretty pastels at Dior to rows of ruffles at Valentino—lightened up all the black, brown, and…