Fireworks · kimi-k3.1-pro

I need build one index self-contained. Should have tools and browser test. I'll create visually high quality. Should be mindful full screen canvas. I have ~15min but can do. Should probably have no existing files. I should inspect ls.

I'll implement. Design cinematic night scene with canvas full-screen background stars skyline silhouettes water reflections perhaps procedural. UI small top left title "PYRO / NIGHT STUDIES" subtle, Clear button top right, count? Bottom hint. Full canvas click. Use retina handling. Trails persistent? I need Clear removes trails. Canvas redraw procedural background each frame so trails implemented arrays points not accumulation. Shell visible upward from bottom toward clicked target, travels easing, arc slight. Shell starts bottom at clicked x-ish perhaps bottom x same target? Requirement click affects launch target. Use shell object with start at target x + small jitter and y height+15, target. ascent duration based distance 0.9-1.5 sec. Render bright comet with tail and glow. Explosion at target. radial particles 70-130. Gravity, drag, fade. Several shells. Auto shell at 55%w 35%h initial 350ms. Clear removes arrays and resets auto timer perhaps clears all including queued auto. Demo only once anyway.

Background: canvas full screen, night gradient, stars (random precompute per resize seeded) twinkle, moon perhaps not necessary. horizon skyline procedural around 80% h, city windows. subtle water bottom ~13% reflecting colors. But drawing all each frame manageable. Use offscreen background canvas generated on resize, stars dynamic perhaps draw. Fireworks additive. UI accessible pointer events. Clear button. Clicking controls shouldn't launch. Full canvas receives pointerdown. Keyboard Space launches random, C clear optional. Touch works.

Particles different burst styles? single radial enough. Color palette vibrant coral/gold/cyan/lilac. Create multi ring radial and glitter. Shell head target reticle? On click small launch marker ring, can render subtle target ping. Particles trails arrays per particle max 8-12 points, each frame update and draw segments with alpha. Performance cap shells 20 particles 2500. Draw lines grouped? 100 particles each 8 segments 800 okay. Should visible fade and removal lifetime. Add small crackles? procedural no sound necessary. Launch rising sparks. Shell trails store. Use composite lighter for effects. Early particle fall clearly gravity. Demo automatic. Clear empties shell, particles, trails, ambient embers? only active. Count text live.

Should browser sample ascent/burst/fall possibly screenshot. Add no test hooks required, can inspect via UI screenshots. Could expose window.__fireworks diagnostics useful verification with getState? Not necessary but nice dev object perhaps avoid. Could attach canvas dataset counts and use browser inspect? inspect returns

Should browser run inspect.

Initial before demo expected. Should sample. Browser actions no wait except perhaps screenshot takes. I can inspect perhaps time.

Looks good. Should have exact verification ascent click target early particle fall and fade clear. Browser no eval tool. inspect perhaps not evaluate. Can click chosen and screenshots successive. Diagnostics inaccessible except perhaps browser inspect returns? no eval. Could use screenshots and DOM counts. Click at 300,280. Immediate screenshot likely shell.

Great ascent at x342 target ring at300. Demo particles falling visible. Perhaps wait burst via inspect.

Burst at chosen yes. Early fall inspect.

Clear.

Should resize control usable. browser no resize tool. Can perhaps viewport fixed no. Could inspect mobile via impossible. Code clear. Should check issue drawImage(bg,0,0,W,H) with ctx dpr transform and bg pixel dimensions: drawImage source bg intrinsic to dest W,H under transformed context correct. yes.

Potential accessibility keyboard Space only body target but e.target likely body. fine.

One issue clearAll resets trails but next frame still 0. good.

One issue if clicking while demo active particles overlapping supported.

Status padStart only min no issue.

Auto demo launch on load yes.

No external assets. Good. Should perhaps verify lifetime fade removal with inspect after clear irrelevant. Could launch and wait enough by inspect multiple. Already demo faded from 96 to71 then clear clicked. Required verify particles visibly spread and fade done. Counts lifetime removal not all due new shell. Could clear then launch one and wait perhaps no need. I did initial demo count then click etc. User requested verify ascent burst early fall, target, spread fade clear. All done.

Could report concise response with actual checks. "Created index.html ... Verified in browser: auto demo, click at (300,280) launched... etc. Resizing not directly exercised; responsive canvas/control implemented." Instructions ask behaviors remain unverified. Say "Resize handling was not interactively tested." User wants no extraneous. Fine.