Square retro Polaroid snapshot at 1970s Route 66 gas station AI Image Prompt

Create a square vintage instant-film Polaroid photograph with a thick white border and handwritten blue marker caption reading {argument name="caption text" default="Summer '76"} centered on the bottom margin. The photo shows two young male friends posing casually at a dusty Route 66 gas station in the American Southwest in the 1970s, leaning against a weathered turquoise pickup truck with chipped paint. One friend wears a faded denim jacket and jeans with a belt, the other wears a purple {argument name="band shirt text" default="LED ZEPPELIN"} T-shirt and blue jeans; both have relaxed road-trip body language, faces softly indistinct like an old snapshot. Behind them are vintage gas pumps, a circular Route 66 sign, a rustic sign reading {argument name="roadside sign text" default="Last Gas 47 mi."}, a partial service-station sign, and a small red Coca-Cola sign; the horizon is flat desert with utility poles under a pale washed-out sky. Use authentic 1970s color film emulation: sun-bleached cyan and warm beige tones, faded contrast, visible film grain, dust specks, minor scratches, slight blur, uneven exposure, orange and pink light leaks across the top left and corners, subtle vignetting, and the tactile texture of aged instant photo paper.