# Tarinai Colony Observation Game

Buildless single-page browser simulation. Open `index.html`; no package manager, transpiler, server API, or module loader is required. Runtime order is explicit `<script defer>` order generated from `app_manifest.json`. Current inspected version: `15.20.16`.

## Edit contract

- Preserve Japanese in-game UI tone and strings.
- Do not edit `docs/prompt.txt`; it is external user material.
- Use `app_manifest.json` as the source of truth for CSS/JS load order and service-worker cache entries.
- Run `python3 scripts/generate_app_files.py` after version or asset-list changes.
- Run `node --check js/*.js service-worker.js` before zipping.
- Verify ZIP integrity with `zip -T`.

## Documentation map

- `docs/ARCHITECTURE.md`: runtime architecture, file ownership, system boundaries.
- `docs/CONTENT_GUIDE.md`: item visuals, UI/field visual parity, audio, bubble text inventory.
- `docs/MAINTENANCE.md`: release process, validation, debugging, cache/version rules.
- `docs/prompt.txt`: untouched user prompt/context archive.

## Player-facing surface

- Startup uses a loading overlay that eagerly preloads a small sprite set, initializes UI/world state, then defers remaining image work.
- Field choices are cage, garden, and park. `FIELD_TYPES` controls world scale, starting population, initial grass count, and responsive field height.
- The default field is garden. Reset opens the field dialog; cancel keeps the current field.
- Tools are grouped in collapsible categories: operation/observation, food/water/grass, medicine/effects, habitat/living things, hazards/obstacles.
- The top bar owns pause, speed, ecology, sound, credits, and reset controls. Event push toasts live inside the Event card, while sound category toggles live only in the sound menu.
- The colony panel charts population, mental state, environment, and object counts. The family tree is a separate main section with manual/auto refresh and reset controls.
- Mobile operation modes are available only on compact touch-first phone viewports: auto, camera, tool, family.

## Core systems

- `World`: `js/world.js` plus `js/world_*.js`; time, weather, placement, effects, family records, spatial queries, ants, combat, logging.
- `Tarinai`: `js/tarinai.js` plus `js/tarinai_*.js`; identity, personality, needs, items, disease, movement, social behavior, rendering.
- `Item`: `js/items.js`; lifecycle, scaling, field rendering. Field rendering is the visual source of truth for tool icons.
- `ItemVisualRegistry`: `js/item_visual_registry.js`; canonical item visuals used by field sprites and generated icon previews.
- `EffectRegistry`: `js/effect_registry.js`; item-effect names, modifiers, exclusivity, display metadata, random-effect candidates.
- `DiseaseRegistry`: `js/disease_registry.js`; disease flags, labels, display metadata, cure-rule notes, mystery-drug eligibility.
- `FoodRegistry`: `js/food_registry.js`; serving classes, labels, decay, hygiene penalty, special effect IDs.
- `InputModeManager`: `js/input_mode_manager.js`; mobile/touch classification, gesture capability policy, mode persistence.
- `WeatherSystem`: `js/weather_system.js`; weather state transitions and rain-spawned water items.
- `Audio`: `js/sound_pack.js` owns sound metadata; `js/audio.js` loads samples, applies settings, enforces cooldowns, and runs synthetic fallbacks.
- `Performance`: `js/performance_manager.js`; FPS quality level, ant stride, effect budget, terrain redraw cadence.

## Current high-risk areas

- Item effects touch `effect_registry`, `tarinai_item_effects`, `tarinai_needs_items`, `items`, and selected-info UI.
- Mobile input must remain hidden on desktop-class devices; `TarinaiInputMode.snapshot().touchFirst` controls body class `touch-mobile-ui`.
- Weather rain overlay is diagonal line streaks. Fallen water items, zunda juice, and mercury share the same horizontal oval item-droplet silhouette; recolor only.
- Tool UI icons must be generated previews of `js/items.js` drawing helpers, never separate designs.