健身房免費體驗券傳單（暗黑電光動感風）

prompt

Create a bold A5 handout flyer for {gym_name} promoting a {trial_length} free trial pass. Dark charcoal background with electric {accent_color} diagonal light streaks, a dynamic silhouette of an athlete performing a powerful {exercise_pose}, motion blur on the limbs, gritty texture, hard rim lighting. Strong diagonal composition pushing energy from bottom-left to top-right. Leave the top quarter as a clean dark gradient band for the headline overlay, and reserve a solid block at the bottom for QR code, address and {offer_deadline} details. Condensed grotesque typography mood, oversized numbers. Street-poster energy, slightly grainy, 3:4 portrait ratio with bleed for A5 trim, no readable text baked into the image.