Red, White, and Blue Berry Trifle

INGREDIENTS

• 1 1/2 pounds raspberries (5 cups)
• 3/4 cup confectioners' sugar
• 1/4 cup fresh orange juice (from 1 large orange)
• 10 ounces mascarpone cheese (1 1/3 cups)
• 1 1/4 cups cold heavy cream
• 1/2 teaspoon pure vanilla extract
• Fine salt
• 20 to 24 ladyfingers (from a 7-ounce package), broken into 1-inch pieces
• 3/4 pound blueberries (2 1/2 cups)