Implemented Hamster Tap Tycoon with all upgrades, automatic income, floating rewards and offline, memory-only play.

Build, strict typecheck, 21 interaction checks and 16 design checks passed. Delivery totals 1.12 MiB.

README, design documentation and validation report are included. WebKit remains unverified because required system libraries were unavailable.

Area	Result
Requirements	24 met; 0 missing; 0 faked
Broken features	0 observed
First screen at 390 px	Product and main action visible
taste@1	16/16 passed
Copy findings	0
Share card	Present, 1200 × 630

No reproducible defects found. .imd-findings.json contains {"findings":[]}. Website files remain unchanged.

Chromium passed 14 interaction and reflow checks. Accessibility audits found no violations in initial, upgraded and help states; help contrast was checked separately. WebKit remains unverified because required runtime libraries were unavailable.

Evidence below refers to index.html.

Explicit requirement	Status	Evidence
“single-page browser game”	Met	One HTML page containing the game
“Hamster Tap Tycoon”	Met	<title> and header <h1>
“A big hamster button in the center”	Met	#hamster-button; centered in play area, 252 × 252 px on mobile
“Each tap earns coins”	Met	Click handler; touch and keyboard checks
“coin balance … at the top”	Met	#balance, above hamster
“coins-per-tap at the top”	Met	#per-tap, above hamster
“Shop with 3 upgrades”	Met	Three .upgrade entries
“stronger tap (+1 per tap)”	Met	#buy-tap increases base tap earnings
“auto-tapper (coins per second)”	Met	#buy-auto, settleAuto()
“a coin multiplier”	Met	#buy-multiplier scales both income sources
“Each costs more after every purchase”	Met	Increasing prices verified through repeated purchases
“Floating '+1' animation on each tap”	Met	floatCoin(); displays actual upgraded reward
“Pure HTML, CSS and JavaScript in one page”	Met	Inline <style> and <script>
“No backend”	Met	Gameplay runs locally
“no login”	Met	No authentication flow
“no wallet connection”	Met	No wallet integration
“no external APIs”	Met	No API calls or external runtime requests
“Progress kept in memory only”	Met	Closure state; refresh resets progress
“Mobile-first layout”	Met	Base mobile styles; responsive checks passed
“large touch targets”	Met	All five visible controls meet 44 px minimum
“works offline once loaded”	Met	Offline taps, purchases and automatic income passed
“Dark theme”	Met	Charcoal background and dark surfaces
“simple cartoon hamster made with emoji or CSS”	Met	.hamster CSS illustration
“A game for the hamster economy.”	Met	Exact footer text

The visual idea is a charcoal clicker game centered on a CSS hamster holding a coin inside one large gold medallion.