Create a line art illustration for a coloring book page with a 2:3 aspect ratio, featuring a wooden lifeguard chair on a beach at sunset. The chair should have a sturdy A-frame design with a slanted backrest and a single bench seat atop the platform. Include the ladder on one side leading up to the platform, which is enclosed by a safety railing on three sides and a small roof overhead. The chair should be positioned on textured sand, with the waves gently lapping at the shore and a simple gradient for the sunset sky. Emphasize clean, bold lines for coloring and avoid shading to leave the image open for personal interpretation