Goal: Create a retro 2D vertical arcade game title screen for a rail shooter called {argument name="game title" default="GALAXY RAIL"}, with a space-and-railroad theme and Japanese UI text.
Canvas: Portrait mobile game splash screen, 9:16 aspect ratio, pixel-art inspired but clean vector-like illustration, dark navy outer-space background filled with many small white and pale yellow stars.
Layout: Center the title in the upper-middle. Place a large partially cropped Earth-like blue planet on the left behind the title, occupying about one third of the image height, with simple green landmasses and translucent cloud streaks. Add exactly 3 vertical railroad tracks running from top to bottom: one left track partly over the planet, one center track, and one right track; each track has gray rails and many brown sleepers. Put exactly 2 small train/player cars on the lower center track, stacked vertically with rounded white bodies, blue windows, yellow outlines, and a yellow headlight on the top car.
Text content: Main title text is two lines: “GALAXY” in large white slab-serif letters with a dark navy outline, and “RAIL” below in large golden yellow slab-serif letters with a dark navy outline. Under the title, show the Japanese tagline {argument name="tagline" default="銀河を、レールで切り拓く"} in bright cyan. Beneath it, add small gray feature text: “RAIL SHOOTER / 2D VERTICAL / 3 STAGES”. In the lower third, add a translucent dark blue rectangular instruction panel with a thin blue border. Inside the panel, show three Japanese instruction lines: “←→↑↓ / WASD：移動（レールから自動ジャンプ）”, “Z / SPACE：短押し＝単発 / 長押し＝2連射”, and “時間経過で最寄りのレールへ強制着地”. Below the panel, add a small red warning line: “赤いサークル＝瞬着攻撃の予兆。収束前に発生源を倒せ！” At the very bottom, centered, show pale gray prompt text: {argument name="start prompt" default="PRESS Z SPACE OR CLICK TO START"}.
Visual style: Retro arcade title screen, simple 2D game mockup, crisp shapes, slightly pixelated typography, high contrast, deep-space palette of navy, white, cyan, yellow, gray, and red. The composition should feel like a vertical rail shooter prototype splash screen.
Constraints: Use exactly 3 full-height vertical tracks, exactly 2 train cars, one planet on the left, one instruction panel, and no characters or extra UI windows. Keep all text legible and centered, with no logos or watermarks.
