Marine

A bold lecture system of deep navy slides on a periwinkle ground, carried by bright daylight photographs of real places: full-bleed openers under a navy title plate, half-slide photo plates, and wide photo bands. Large cool-white serif titles over a two-line contour rule, royal-blue display numerals, native cross-sections in theme colors, and periwinkle data slides with navy type, plus a live uplift calculator and a discussion timer.