一笔四景：JavaScript 水墨动画

原始提示词

Make a ~50-second animated short entirely in code (JavaScript + canvas) and export it as a 1080x1350 MP4. Style: [sumi-e ink painting on washi paper] — bristle-textured brushstrokes with dry-brush streaks, wet bleed, ink pooling, soft washes, drifting mist, far hills, and one accent color per scene. Story: one continuous brushstroke paints [a pond with a koi and frog], [a bamboo grove with a panda], [a great wave with an octopus and crab], and [a cat curled in an ensō]. A cute [red seal stamp] hero rides the fresh line between scenes and plays with each character. The connecting line fades, then re-inks itself in the final pull-back to reveal it was all one stroke. The cast takes a bow one by one, the hero stamps the corner, and the brush signs [the artist's name]. Music (all synthesized, instrumental): one catchy 4-bar hook repeated in every scene on a different instrument (koto, flute, whistle, bamboo blocks, music box), ~132 BPM, bright and bouncy, with the characters playing parts of the band. Every stroke gets a brush swish. For the feed: open on the finale, rewind the painting back to blank paper, then play the story; end on the opening frame so it loops seamlessly. Add playful on-screen callouts for sound-off viewers.