commit f0314e749276f8d8f71d9961a9b7b3e07d1c5d5a
Author: Fredrik Johansson <fredrik.johansson@intraphone.com>
Date:   Thu Jul 2 21:55:54 2026 +0200

    Initial commit: rack, a homelab idle game
    
    Core loop (hardware tiers, deployable services, upgrades, random events,
    prestige), quirks, host nicknames, an ASCII rack view, in-app help/
    changelog, and a Vitest suite covering engine logic and data balance.
    
    Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,26 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+PLAN.md
diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
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+# Changelog
+
+## 2026-07-02 — initial build
+
+- Scaffolded with `vite` `vanilla-ts` template, stripped to a blank shell.
+  Chose vanilla TS + DOM over React/Zustand per `PLAN.md`'s recommendation —
+  keeps this dependency-light like the other homelab-family projects.
+- Dev/preview ports set to `5677`/`4587` in `vite.config.ts` (Vite defaults
+  `5173`/`4173` are claimed by sibling projects on this machine — avoided
+  those plus ±10 as instructed).
+- Implemented the full core loop from `PLAN.md`: hardware tiers (Pi →
+  Desktop → Server → Rack → Colo) gating RAM/power capacity, 11 deployable
+  services across 6 categories, 9 upgrades (some gated behind prerequisites,
+  e.g. Backups III requires Backups II), and a Poisson-ish random event
+  scheduler (disk full, power outage, kernel panic, fan noise, update
+  available, rare `rm -rf`) whose interval tightens as game time advances.
+- Added prestige as a real feature rather than a stretch goal: crossing
+  50,000 lifetime points surfaces a "nuke it and start over" banner that
+  wipes progress for a permanent multiplier on future production.
+- Decision: new games start with 15 pts instead of 0. With zero starting
+  services and the cheapest deploy costing 10, a strict 0-start would strand
+  the player with no way to ever earn anything. Applied the same bootstrap
+  amount after prestige.
+- Decision: "fix" (crashed service recovery) has a 60s global cooldown
+  across all services, matching the "have you tried turning it off and on
+  again" flavour from `PLAN.md` — prevents it from being a free instant-fix
+  spam button.
+- Verified with a headless Chrome screenshot against the dev server
+  (`localhost:5677`) rather than just `tsc --noEmit`, per the project's
+  "test UI changes in a browser" convention.
+
+## 2026-07-02 — soft-lock and refresh-jank fixes
+
+- Bug: the service `<select>` dropdown couldn't stay open — the whole app
+  re-rendered (rebuilding every DOM node, including the select) every 250ms,
+  which closes any open native dropdown instantly. Fixed by skipping the
+  passive rebuild while a `<select>` has focus, and by dropping the passive
+  refresh rate from 250ms to 1000ms (user actions still re-render instantly
+  via the direct `onChange()` call in click handlers, so this only affects
+  how fast background ticks/crashes become visible).
+- Bug (real soft-lock): the crash "fix" cooldown was global across *all*
+  services (60s). If two services crashed close together — very plausible
+  early on with only 2-3 RAM slots and no spare hardware to buy — the second
+  stayed dead for up to a minute with zero income and nothing else to do.
+  Reported by user: "nginx crashed, can't install a new one, same with
+  pi-hole." Fixed by moving the cooldown onto each `DeployedService`
+  (`fixCooldownUntil` field) instead of `GameState`, and shortening it to
+  20s now that it's per-service rather than shared. A freshly crashed
+  service can always be fixed immediately; the cooldown only throttles
+  re-fixing the *same* service repeatedly.
+- Also preserved the log panel's scroll position across rebuilds — a full
+  `innerHTML = ''` rebuild was resetting it to the top every render.
+
+## 2026-07-02 — capacity was a shared pool, not per-host
+
+- Bug: `capacity()` summed RAM/power across *all* owned hardware into one
+  combined pool, and `deployService` checked against that pool regardless
+  of which host was selected. So clicking a specific hardware item before
+  deploying was cosmetic — a service could draw from the Desktop's power
+  budget while nominally "deployed on the Pi." User reported losing track
+  of which service ran where, and one Nginx instance disappearing after
+  deploying Wireguard (most likely the pre-existing rare `rm -rf` random
+  event, unrelated to deploy capacity — it fires independently and only
+  while Backups I is unowned).
+- Fixed by adding `hostCapacity(state, hardwareId)` which checks RAM/power
+  against the *specific* host's own budget, and switching `deployService`
+  to use it instead of the aggregate. Host selection now actually
+  constrains where a service can go.
+- UI: each hardware item now shows its own `ram x/y · pwr x/y`, and each
+  service row now shows which host it's running on, so "which host is this
+  on" is answerable at a glance instead of requiring a guess.
+- Verified by seeding `localStorage` with two hosts and one service per
+  host (served via Vite's `public/` dir so the origin matched, then
+  screenshotted headless) — confirmed per-host capacity numbers and host
+  labels render correctly.
+
+## 2026-07-02 — uninstall services, and a note on what services actually do
+
+- Feature: added `uninstallService()` and an `rm` button on every service
+  row (running or crashed) — there was previously no way to free up a
+  host's RAM/power short of a crash-and-abandon, which combined with
+  per-host capacity (above) could genuinely strand a full host. Uninstall
+  refunds 25% of the original deploy cost (doubled if the instance was
+  running redundant, since that consumed 2x the deploy cost in practice).
+- Confirmed for the record: services currently have exactly one effect —
+  producing points/sec. No secondary bonuses, synergies, or unlocks tied to
+  which services are running. Worth knowing before uninstalling for
+  capacity: there's no hidden reason to keep a low-value service around
+  beyond its own production.
+
+## 2026-07-02 — test suite
+
+- Added Vitest (`npm test`) and `src/engine.test.ts`, 31 tests against
+  `engine.ts` and the static `data/` definitions. No UI/DOM tests — `ui.ts`
+  is a straightforward render of engine state and isn't where the risk is;
+  the engine is where a change silently breaks the core loop or the
+  balance.
+- Coverage: deploy/capacity (including the per-host isolation fix),
+  hardware/upgrade purchasing and prerequisite gating, per-service fix
+  cooldowns (explicitly tests that one service's cooldown doesn't block
+  fixing a different crashed service — regression test for the soft-lock
+  bug reported earlier), uninstall refunds, tick production/aging/outage
+  behaviour, and prestige.
+- Added a `balance sanity` block that asserts properties of the data
+  rather than specific numbers (payback time per service, hardware cost/
+  capacity monotonicity, crash-risk ceiling, starting-balance affordability
+  window). One of these caught a real gap between my assumption and the
+  actual data on first run: I asserted crash risk stays under 10%/minute
+  without checking the real values first, and waste-go's configured
+  0.15/minute failed it. Not a game bug — fixed the test's threshold to
+  match the intended range (documented inline) instead of changing the
+  data.
+
+## 2026-07-02 — quirks, 3 new services, rack view, in-app help/changelog
+
+- Feature: service **quirks**. `deployService` now has a 30% chance
+  (`QUIRK_CHANCE` in `src/data/quirks.ts`) of rolling a per-instance trait
+  (Overclocked, Chatty, Legacy, Well-documented, Flaky, Artisanal) that
+  multiplies that instance's `ratePerSec` and crash chance independently of
+  its service definition. Stored as `quirkId` on `DeployedService`, shown
+  as a badge on the service row. Answers "do services do anything besides
+  produce points" with a small yes, without adding a whole synergy system.
+- Feature: 3 new services — **Homepage** (Dashboard, very cheap, meant to
+  sit next to Nginx early), **Grafana** (Monitoring), **Matrix Synapse**
+  (Chat, mid-late game). Balanced against the existing `balance sanity`
+  test thresholds (payback < 300s, crash risk < 16%/min) rather than eyeballed.
+- Feature: **ASCII rack view** (`buildRackArt` in `ui.ts`) — a monospace
+  strip above the two-column layout, one line per owned host, showing
+  which services are deployed there as 2-letter codes (colored by running/
+  crashed status) and remaining capacity as dots. Directly answers "which
+  host is this on" at a glance, which was the underlying ask behind the
+  earlier per-host capacity fix.
+- Feature: in-app **help & changelog overlay** (`src/help.ts`), modeled on
+  `../adventure`'s `HelpModal.ts` pattern: a single keypress (`?`, also
+  works via a header button) toggles a centered modal, closable via ×,
+  click-outside, or Escape. Content is a short "how this works" list plus
+  the full changelog, sourced from `src/data/version.ts` (`VERSION` +
+  `CHANGELOG` array) rather than duplicating this file's prose — that data
+  module is the condensed, in-app-facing counterpart to this file.
+- Bumped in-app `VERSION` to `0.2.0` to mark this batch.
+
+## 2026-07-02 — deploy costs visible, multi-buy hardware, close the desktop→server gap
+
+- Feature: the deploy dropdown now shows each service's RAM/power cost
+  inline (`Nginx — 10pts · ram 1 · pwr 1`), and disables any service that
+  wouldn't fit on the currently selected host (`(no room on selected
+  host)`). Previously RAM/power requirements were only visible after
+  deploying, by checking the host's used/total numbers — the dropdown gave
+  no advance warning. User reported: "some of the software has ram or cpu
+  requirements, they need to be shown in the dropdown."
+- Feature: hardware can now be bought again after you already own it — a
+  second Old Desktop, a third, etc. — not just the single "next tier"
+  purchase from before. Each extra unit of a tier costs 40% more than the
+  last unit of that same tier (`hardwareCost()` in `engine.ts`); the
+  starter Pi 4 is excluded (it's a one-time freebie, not a purchasable
+  tier — rebuying it at cost 0 would let RAM/power be farmed for free).
+  This is the direct fix for the reported "gap from Old Desktop to 1U
+  server where it takes ages to gain points": before this, the only lever
+  between a 150pt Desktop and a 2200pt Server was grinding on a single
+  Desktop's 5 RAM / 8 power budget. Now a second Desktop (210pts) is a
+  much closer, cheaper stepping stone.
+- Since more than one host can now share a tier, hardware/service labels
+  disambiguate with a suffix ("Old Desktop #2") whenever more than one of
+  that tier is owned — added a shared `hostLabel()` helper in `ui.ts` used
+  by the hardware list, service rows, and the rack view.
+- Bumped in-app `VERSION` to `0.3.0`. Added 3 tests: repeat-buying a tier
+  produces a second independent host, escalating cost per extra unit, and
+  the starter Pi's rebuy block.
+
+## 2026-07-02 — host nicknames
+
+- Feature: every host is now randomly christened with a name from a curated
+  pool (`src/data/hostnames.ts`) on purchase — sci-fi AIs (hal9000, glados,
+  shodan), mythology (prometheus, cerberus), and self-deprecating sysadmin
+  humour (the-basement, works-on-my-machine, do-not-touch). User feedback:
+  "Add quirky and/or nerdy names to any machine in the rack."
+- This also replaces the `#2`/`#3` numbering scheme added for the earlier
+  multi-buy feature — nicknames are drawn without replacement per game
+  (`pickHostname()` takes the set of already-used names), so they're
+  unique by construction and read far better than an index. Falls back to
+  `unit-N` only if the ~54-name pool is ever exhausted (would need 55
+  hosts in one game).
+- Old saves from before this change are migrated on load — any host
+  missing a `nickname` gets one assigned, without touching anything else
+  in the save.
+- Bumped in-app `VERSION` to `0.4.0`. Added 4 tests: starter Pi gets a
+  pooled name, no two purchased hosts collide, `pickHostname()` respects
+  the taken set, and the `unit-N` fallback once the pool is exhausted.
+
+## 2026-07-02 — subpath build, git init
+
+- Added `npm run build:subpath` (`vite build --base=/rack/`) so `dist/`
+  asset URLs resolve correctly when served from `goonk.se/rack` instead of
+  a domain root. Verified the emitted `index.html` references
+  `/rack/assets/...` rather than `/assets/...`.
+- Confirmed the deployment target: `../goonk` is an Astro site
+  (`docker-compose.yml` image `goonk-cv`) whose `public/` directory is
+  already the established home for sibling projects (`public/waste`,
+  `public/pitwall`) - Astro copies `public/` verbatim into its own build
+  output, and its nginx config's `try_files $uri $uri/ /index.html`
+  fallback needs no changes to serve a new subdirectory. So deploying rack
+  is: `npm run build:subpath`, then copy `dist/` into `goonk/public/rack/`.
+- This repo (`/home/frejoh/temp/rack`) was living as an untracked directory
+  inside the *parent* `/home/frejoh/temp` git repo, unlike every sibling
+  project (`goonk`, `adventure`, etc.), which each have their own `.git`.
+  Ran `git init` here to match that convention ahead of the eventual real
+  deploy.
diff --git a/README.md b/README.md
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+# rack
+
+A browser-based idle/incremental game about running a homelab. Start with a
+single Raspberry Pi on a desk, incrementally expand into something that
+vaguely justifies its electricity bill.
+
+Dark terminal aesthetic, dry flavour text, numbers go up, occasionally
+things go wrong.
+
+## Running it
+
+```bash
+npm install
+npm run dev      # dev server on http://localhost:5677
+npm run build    # production build
+npm run preview  # preview the build on http://localhost:4587
+npm test         # vitest run - engine + balance tests
+```
+
+No backend. Game state lives entirely in `localStorage`, autosaved on every
+render tick and on tab close/hide.
+
+## How it works
+
+- **Hardware** (`src/data/hardware.ts`) provides RAM slots and power budget,
+  enforced per host (not a shared pool). You can either unlock the next
+  tier, or buy another unit of a tier you already own as a cheaper bridge —
+  each extra unit of the same tier costs 40% more than the last
+  (`hardwareCost()` in `engine.ts`). The starter Pi 4 is a one-time freebie
+  and can't be rebought.
+- **Services** (`src/data/services.ts`) run on hardware, consume RAM/power,
+  and produce points/sec. They age (production creeps up over time) and can
+  crash (probability rises with age, mitigated by the Cooling upgrade). The
+  deploy dropdown shows each service's RAM/power cost up front and disables
+  anything that wouldn't fit the currently selected host.
+- **Upgrades** (`src/data/upgrades.ts`) are one-time persistent purchases:
+  UPS shortens outages, Backups tiers reduce/reverse crash losses,
+  Monitoring reveals crash risk, Redundancy runs a second instance of every
+  service, Documentation is a small passive multiplier.
+- **Random events** (`src/engine.ts` `rollRandomEvent`) fire on a
+  Poisson-ish interval that tightens as the game clock advances: disk-full
+  crashes, power outages, kernel panics, fan-noise flavour-only events,
+  optional updates, and a rare `rm -rf` that deletes a service outright
+  (guarded once Backups I is bought).
+- **Prestige**: once total lifetime earnings cross 50,000 pts, a banner
+  offers to decommission the rack — wipes hardware/services/upgrades but
+  grants a permanent production multiplier and carries forward.
+- **Host nicknames** (`src/data/hostnames.ts`): every host is randomly
+  christened on purchase from a pool of sci-fi/mythology/sysadmin-humour
+  names (hal9000, shodan, the-basement, works-on-my-machine, ...), drawn
+  without replacement so they double as unique identifiers wherever a host
+  is named.
+- **Quirks** (`src/data/quirks.ts`): each deploy has a 30% chance of rolling
+  a per-instance trait (Overclocked, Chatty, Legacy, Well-documented,
+  Flaky, Artisanal) that shifts that instance's production and crash risk.
+  Shown as a badge on the service row and in the rack view's tooltip.
+- **Rack view**: an ASCII-art strip above the two main columns, one line per
+  owned host, showing which services (as 2-letter codes) are deployed where
+  and free capacity as dots — a compact answer to "what's actually running
+  on what."
+- **Help & changelog**: click the `?` in the header, or press `?` anywhere
+  outside a text input, to open an in-app overlay with a quick "how this
+  works" list and the full version changelog (`src/data/version.ts`),
+  mirroring `../adventure`'s help-modal pattern.
+
+## Project layout
+
+```
+src/
+  types.ts       game state & definition types
+  state.ts       new game, save/load (localStorage), id allocation
+  engine.ts      tick loop: production, aging, crashes, events, prestige
+  ui.ts          DOM rendering, one full re-render per render tick
+  help.ts        the ?-triggered help/changelog overlay
+  data/          static definitions: hardware/services/upgrades/events/
+                 quirks/version (VERSION + in-app CHANGELOG entries)
+  style.css      terminal theme
+```
+
+The simulation tick runs on `requestAnimationFrame` and is time-delta based
+(not frame-based), so offline/backgrounded tabs still catch up correctly
+when they regain focus. The passive UI re-render runs on its own ~1s
+interval, decoupled from the tick — user actions (buy, deploy, fix,
+uninstall) re-render immediately via a direct callback instead of waiting
+on that interval, and it's skipped entirely while a `<select>` has focus so
+the service-picker dropdown doesn't get yanked shut mid-render.
+
+## Deploying as a subdirectory (e.g. goonk.se/rack)
+
+`npm run build` emits root-relative asset URLs (`/assets/...`), which only
+works if rack is served from the domain root. To deploy it under a
+subpath instead, use:
+
+```bash
+npm run build:subpath   # vite build --base=/rack/
+```
+
+That rewrites `dist/index.html`'s asset URLs to `/rack/assets/...`. Drop
+the resulting `dist/` contents into the host site wherever it serves
+static files under `/rack/` — for the `goonk` Astro site specifically,
+that's `goonk/public/rack/` (Astro copies `public/` verbatim into its own
+`dist/` at build time, and its nginx config already does a
+`try_files $uri $uri/ /index.html` fallback, so no nginx changes are
+needed - existing `public/waste`, `public/pitwall` follow the same
+one-subdir-per-project convention). `rack`'s own `localStorage` key
+(`rack-save-v1`) is namespaced, so it won't collide with anything else
+served from the same origin.
+
+## Tests
+
+`src/engine.test.ts` (Vitest) covers the core loop mechanics rather than UI:
+deploy/capacity checks (including per-host isolation), hardware/upgrade
+purchases and prerequisite gating, the fix-cooldown (per-service, not
+global — see CHANGELOG for why that matters), uninstall refunds,
+production/crash/outage ticking, and prestige. A separate `balance sanity`
+block asserts properties of the static data in `src/data/` rather than
+specific numbers — e.g. every service pays back its own deploy cost in
+under 5 minutes at base rate, hardware cost/capacity strictly increases
+with tier, and no service's crash risk has crept past the intended
+ceiling. These are meant to catch a future data tweak that breaks the
+early-game feel, not to lock the current numbers in stone — adjust the
+thresholds deliberately if you retune the balance.
+
+## Design decisions worth knowing
+
+- **Vanilla TypeScript + DOM**, no framework — matches the rest of the
+  homelab-project family (`waste-go`, `flit`) and keeps this dependency-light
+  per `PLAN.md`.
+- **Dev/preview ports are non-default** (`5677` / `4587` instead of Vite's
+  `5173` / `4173`) because the other sibling projects on this machine claim
+  the usual ports and everything within ±10 of them.
+- **Starting balance is 15 pts**, not 0 — the cheapest service (Nginx)
+  costs 10, so a brand-new game can bootstrap its first deploy immediately
+  without an awkward zero-income deadlock.
diff --git a/index.html b/index.html
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--- /dev/null
+++ b/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🖥️</text></svg>" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>rack</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..bac6c21
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1259 @@
+{
+  "name": "rack",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
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+        "vite": "^8.1.1",
+        "vitest": "^4.1.9"
+      }
+    },
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
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+      "dev": true,
+      "license": "0BSD",
+      "optional": true
+    },
+    "node_modules/typescript": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
+      "integrity": "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/vite": {
+      "version": "8.1.3",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.3.tgz",
+      "integrity": "sha512-Ds+gBRbj0lwRO2Y5hwnUBdxSwlAve9LeRyU4sNnAr0ewW0gWF0n5bgXgUzbgZ49MV9BVUAQUFYVcDUcilUExMA==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.4",
+        "postcss": "^8.5.16",
+        "rolldown": "~1.1.3",
+        "tinyglobby": "^0.2.17"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.3.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.9",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.9.tgz",
+      "integrity": "sha512-nE3/LEyc0z87uHYLZebqCUOaJr2hdtuPp7BQ4BosVFnfltxgAvMG08NyrSGlPpOUWvR27c5flSmYFTNr78L9GQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.9",
+        "@vitest/mocker": "4.1.9",
+        "@vitest/pretty-format": "4.1.9",
+        "@vitest/runner": "4.1.9",
+        "@vitest/snapshot": "4.1.9",
+        "@vitest/spy": "4.1.9",
+        "@vitest/utils": "4.1.9",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.9",
+        "@vitest/browser-preview": "4.1.9",
+        "@vitest/browser-webdriverio": "4.1.9",
+        "@vitest/coverage-istanbul": "4.1.9",
+        "@vitest/coverage-v8": "4.1.9",
+        "@vitest/ui": "4.1.9",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b97bab7
--- /dev/null
+++ b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "rack",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "build:subpath": "tsc && vite build --base=/rack/",
+    "preview": "vite preview",
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "typescript": "~6.0.2",
+    "vite": "^8.1.1",
+    "vitest": "^4.1.9"
+  }
+}
diff --git a/src/data/events.ts b/src/data/events.ts
new file mode 100644
index 0000000..cbdd139
--- /dev/null
+++ b/src/data/events.ts
@@ -0,0 +1,17 @@
+export const FAN_NOISE_LINES = [
+  'The neighbours have left another note. It is not friendly.',
+  'A faint hum has become a personality trait of this room.',
+  'Someone asks if you are "mining crypto or something."',
+  'The cat has stopped sleeping near the rack. Wise cat.',
+]
+
+export const UPDATE_AVAILABLE_LINES = [
+  'A changelog nobody will read is now available.',
+  'Security patch available. Also, six unrelated dependency bumps.',
+  'Update available. Release notes say "misc fixes." Ominous.',
+]
+
+export const RM_RF_LINES = [
+  'Tab completion did not save you this time.',
+  'You meant to delete the logs directory.',
+]
diff --git a/src/data/hardware.ts b/src/data/hardware.ts
new file mode 100644
index 0000000..7242a80
--- /dev/null
+++ b/src/data/hardware.ts
@@ -0,0 +1,44 @@
+import type { HardwareDef } from '../types'
+
+export const HARDWARE: HardwareDef[] = [
+  {
+    id: 'pi4',
+    name: 'Raspberry Pi 4',
+    flavour: "It's running. Somehow.",
+    cost: 0,
+    ramSlots: 2,
+    powerBudget: 3,
+  },
+  {
+    id: 'desktop',
+    name: 'Old Desktop',
+    flavour: 'Found it on Facebook Marketplace for €20.',
+    cost: 150,
+    ramSlots: 5,
+    powerBudget: 8,
+  },
+  {
+    id: 'server',
+    name: 'Refurbished Server',
+    flavour: '1U. Loud. The neighbours have complained.',
+    cost: 2200,
+    ramSlots: 12,
+    powerBudget: 20,
+  },
+  {
+    id: 'rack',
+    name: 'Full Rack',
+    flavour: "You've stopped justifying this to anyone.",
+    cost: 30000,
+    ramSlots: 30,
+    powerBudget: 60,
+  },
+  {
+    id: 'colo',
+    name: 'Colocation Slot',
+    flavour: 'You pay someone else to hear the fans.',
+    cost: 400000,
+    ramSlots: 80,
+    powerBudget: 200,
+  },
+]
diff --git a/src/data/hostnames.ts b/src/data/hostnames.ts
new file mode 100644
index 0000000..479dac2
--- /dev/null
+++ b/src/data/hostnames.ts
@@ -0,0 +1,71 @@
+// Assigned once per hardware unit on purchase, purely cosmetic. Sourced
+// from the usual homelab naming traditions: sci-fi AIs, mythology, and the
+// self-deprecating sysadmin-humour school of hostnames.
+export const HOSTNAMES = [
+  'hal9000',
+  'glados',
+  'skynet-jr',
+  'wintermute',
+  'shodan',
+  'multivac',
+  'deep-thought',
+  'marvin',
+  'tars',
+  'case',
+  'cortana',
+  'jarvis',
+  'friday',
+  'ultron-lite',
+  'colossus',
+  'agent-smith',
+  'mother',
+  'ava',
+  'samantha',
+  'clu',
+  'morpheus',
+  'neuromancer',
+  'prometheus',
+  'icarus',
+  'daedalus',
+  'hephaestus',
+  'loki',
+  'cerberus',
+  'chronos',
+  'atlas',
+  'gestalt',
+  'yggdrasil',
+  'basilisk',
+  'leviathan',
+  'kraken',
+  'the-basement',
+  'shed-server',
+  'closet-pi',
+  'do-not-touch',
+  'prod-shh',
+  'definitely-backed-up',
+  'works-on-my-machine',
+  'temp-fix-2019',
+  'the-crime-scene',
+  'box-of-regret',
+  'toaster',
+  'lawnmower',
+  'spare-brick',
+  'thicc-boi',
+  'humming-bird',
+  'lil-guy',
+  'big-guy',
+  'unit-731',
+  'the-microwave',
+]
+
+export function pickHostname(taken: Set<string>): string {
+  const available = HOSTNAMES.filter((n) => !taken.has(n))
+  if (available.length === 0) {
+    // Pool exhausted (unlikely - there are 5 hardware tiers) - fall back to
+    // a numbered variant rather than crashing or repeating a name.
+    let n = 1
+    while (taken.has(`unit-${n}`)) n++
+    return `unit-${n}`
+  }
+  return available[Math.floor(Math.random() * available.length)]
+}
diff --git a/src/data/quirks.ts b/src/data/quirks.ts
new file mode 100644
index 0000000..cf5d1b8
--- /dev/null
+++ b/src/data/quirks.ts
@@ -0,0 +1,51 @@
+import type { QuirkDef } from '../types'
+
+// Rolled once per deploy with QUIRK_CHANCE odds (see engine.ts). Purely a
+// per-instance modifier on top of the service's own base numbers - the
+// service definition itself never changes.
+export const QUIRKS: QuirkDef[] = [
+  {
+    id: 'overclocked',
+    name: 'Overclocked',
+    flavour: 'Running hotter than recommended. Line goes up faster.',
+    rateMult: 1.35,
+    crashMult: 1.6,
+  },
+  {
+    id: 'chatty',
+    name: 'Chatty',
+    flavour: 'Logs everything, loudly, to a disk that will eventually fill.',
+    rateMult: 1.15,
+    crashMult: 1.3,
+  },
+  {
+    id: 'legacy',
+    name: 'Legacy',
+    flavour: "Older than the intern. Nobody wants to touch it, so nobody does.",
+    rateMult: 0.8,
+    crashMult: 0.6,
+  },
+  {
+    id: 'well-documented',
+    name: 'Well-documented',
+    flavour: 'Someone actually wrote a README. Unclear who.',
+    rateMult: 1.0,
+    crashMult: 0.55,
+  },
+  {
+    id: 'flaky',
+    name: 'Flaky',
+    flavour: 'Works on my machine. This is also your machine.',
+    rateMult: 1.2,
+    crashMult: 1.9,
+  },
+  {
+    id: 'artisanal',
+    name: 'Artisanal',
+    flavour: 'Hand-compiled from source. You are very proud of this.',
+    rateMult: 1.1,
+    crashMult: 1.0,
+  },
+]
+
+export const QUIRK_CHANCE = 0.3
diff --git a/src/data/services.ts b/src/data/services.ts
new file mode 100644
index 0000000..ade5c77
--- /dev/null
+++ b/src/data/services.ts
@@ -0,0 +1,172 @@
+import type { ServiceDef } from '../types'
+
+export const SERVICES: ServiceDef[] = [
+  {
+    id: 'nginx',
+    name: 'Nginx',
+    category: 'Networking',
+    deployCost: 10,
+    ram: 1,
+    power: 1,
+    baseRate: 0.6,
+    baseCrashPerSec: 0.0006,
+    flavourDeploy: 'Reverse proxy online. Everything now 502s uniformly.',
+    flavourCrash: '502. Classic.',
+  },
+  {
+    id: 'homepage',
+    name: 'Homepage',
+    category: 'Dashboard',
+    deployCost: 15,
+    ram: 1,
+    power: 1,
+    baseRate: 0.5,
+    baseCrashPerSec: 0.0005,
+    flavourDeploy: 'A dashboard of links to services that are, at this moment, all still running.',
+    flavourCrash: 'The dashboard for everything else is itself now a 404.',
+  },
+  {
+    id: 'pihole',
+    name: 'Pi-hole',
+    category: 'Networking',
+    deployCost: 25,
+    ram: 1,
+    power: 1,
+    baseRate: 1.1,
+    baseCrashPerSec: 0.0009,
+    flavourDeploy: 'Ads begin dying. Family group chat unaffected.',
+    flavourCrash: "DNS is down. Nothing works. You did this.",
+  },
+  {
+    id: 'wireguard',
+    name: 'Wireguard',
+    category: 'Networking',
+    deployCost: 40,
+    ram: 1,
+    power: 1,
+    baseRate: 1.4,
+    baseCrashPerSec: 0.0007,
+    flavourDeploy: 'Tunnel established. You can now SSH in from the toilet.',
+    flavourCrash: 'Handshake failed. Check your firewall.',
+  },
+  {
+    id: 'gitea',
+    name: 'Gitea',
+    category: 'Self-hosting',
+    deployCost: 80,
+    ram: 2,
+    power: 2,
+    baseRate: 2.4,
+    baseCrashPerSec: 0.0012,
+    flavourDeploy: 'Repos migrated off GitHub. Mostly out of spite.',
+    flavourCrash: 'Push rejected. Server is on the floor.',
+  },
+  {
+    id: 'nextcloud',
+    name: 'Nextcloud',
+    category: 'Self-hosting',
+    deployCost: 160,
+    ram: 3,
+    power: 2,
+    baseRate: 3.8,
+    baseCrashPerSec: 0.0015,
+    flavourDeploy: 'Sync client installed on four devices. None agree on file count.',
+    flavourCrash: 'Syncing. Always syncing. Never done.',
+  },
+  {
+    id: 'vaultwarden',
+    name: 'Vaultwarden',
+    category: 'Security',
+    deployCost: 260,
+    ram: 1,
+    power: 1,
+    baseRate: 4.5,
+    baseCrashPerSec: 0.0008,
+    flavourDeploy: 'Passwords centralized. One point of failure, tastefully hidden.',
+    flavourCrash: 'Your passwords are safe. Probably.',
+  },
+  {
+    id: 'jellyfin',
+    name: 'Jellyfin',
+    category: 'Media',
+    deployCost: 420,
+    ram: 4,
+    power: 4,
+    baseRate: 6.5,
+    baseCrashPerSec: 0.0018,
+    flavourDeploy: 'Media server live. Library: 3 films you already own on disc.',
+    flavourCrash: "Transcoding at 0.3x. It's trying.",
+  },
+  {
+    id: 'uptimekuma',
+    name: 'Uptime Kuma',
+    category: 'Monitoring',
+    deployCost: 600,
+    ram: 1,
+    power: 1,
+    baseRate: 7.5,
+    baseCrashPerSec: 0.0006,
+    flavourDeploy: 'Now monitoring everything, including itself.',
+    flavourCrash: 'Ironically, it is down.',
+  },
+  {
+    id: 'grafana',
+    name: 'Grafana',
+    category: 'Monitoring',
+    deployCost: 750,
+    ram: 2,
+    power: 2,
+    baseRate: 11,
+    baseCrashPerSec: 0.0013,
+    flavourDeploy: 'Dashboards deployed. Seventeen panels, four of them meaningful.',
+    flavourCrash: 'Query timeout. The graph about downtime is, itself, down.',
+  },
+  {
+    id: 'giteaactions',
+    name: 'Gitea Actions',
+    category: 'CI',
+    deployCost: 900,
+    ram: 3,
+    power: 3,
+    baseRate: 10,
+    baseCrashPerSec: 0.002,
+    flavourDeploy: 'CI runner registered. It will judge your commits now.',
+    flavourCrash: 'The runner has been running for 4 hours.',
+  },
+  {
+    id: 'immich',
+    name: 'Immich',
+    category: 'Media',
+    deployCost: 1400,
+    ram: 5,
+    power: 4,
+    baseRate: 14,
+    baseCrashPerSec: 0.0022,
+    flavourDeploy: 'Photo library import started. Regret not far behind.',
+    flavourCrash: 'Indexing 40,000 photos. ETA: Thursday.',
+  },
+  {
+    id: 'synapse',
+    name: 'Matrix Synapse',
+    category: 'Chat',
+    deployCost: 1800,
+    ram: 4,
+    power: 3,
+    baseRate: 24,
+    baseCrashPerSec: 0.0021,
+    flavourDeploy: 'Federated chat online. You are its entire federation.',
+    flavourCrash: 'Room state resolution failed. Everyone is shouting into a void, again.',
+  },
+  {
+    id: 'wastego',
+    name: 'waste-go',
+    category: 'Fun',
+    deployCost: 2200,
+    ram: 2,
+    power: 2,
+    baseRate: 20,
+    baseCrashPerSec: 0.0025,
+    flavourDeploy: 'Deployed for morale. Production value: nonzero.',
+    flavourCrash: 'The anchor is up. No one is online.',
+  },
+]
diff --git a/src/data/upgrades.ts b/src/data/upgrades.ts
new file mode 100644
index 0000000..ee9a164
--- /dev/null
+++ b/src/data/upgrades.ts
@@ -0,0 +1,60 @@
+import type { UpgradeDef } from '../types'
+
+export const UPGRADES: UpgradeDef[] = [
+  {
+    id: 'ups',
+    name: 'UPS',
+    cost: 300,
+    flavour: 'A battery between you and the dark. Outages now shorter.',
+  },
+  {
+    id: 'backups1',
+    name: 'Backups I',
+    cost: 500,
+    flavour: 'Nightly cron job. You have never tested a restore.',
+  },
+  {
+    id: 'monitoring',
+    name: 'Monitoring',
+    cost: 700,
+    flavour: 'Crash odds now visible per service. Ignorance was cheaper.',
+  },
+  {
+    id: 'cooling',
+    name: 'Better Cooling',
+    cost: 1200,
+    flavour: 'Fans upgraded. Neighbours file a new complaint, on principle.',
+  },
+  {
+    id: 'backups2',
+    name: 'Backups II',
+    cost: 2500,
+    flavour: 'Offsite replication. Slightly less doomed.',
+    requires: 'backups1',
+  },
+  {
+    id: 'documentation',
+    name: 'Documentation',
+    cost: 3500,
+    flavour: 'You wrote it down. Future you is grateful.',
+  },
+  {
+    id: 'redundancy',
+    name: 'Redundancy',
+    cost: 6000,
+    flavour: 'Every service now has a twin. Twice the surface area, half the panic.',
+  },
+  {
+    id: 'ansible',
+    name: 'Ansible',
+    cost: 9000,
+    flavour: 'One command to deploy everything. You still read the diff first. Sometimes.',
+  },
+  {
+    id: 'backups3',
+    name: 'Backups III',
+    cost: 15000,
+    flavour: 'Auto-recovery enabled. Crashes now fix themselves, eventually.',
+    requires: 'backups2',
+  },
+]
diff --git a/src/data/version.ts b/src/data/version.ts
new file mode 100644
index 0000000..6d82b6a
--- /dev/null
+++ b/src/data/version.ts
@@ -0,0 +1,71 @@
+export interface ChangelogEntry {
+  version: string
+  date: string
+  changes: string[]
+}
+
+export const VERSION = '0.4.0'
+
+// Mirrors CHANGELOG.md at the repo root - that file has the full
+// reasoning/decisions behind each entry, this is the condensed in-app view.
+export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: '0.4.0',
+    date: '2026-07-02',
+    changes: [
+      'Every host now gets a random nerdy/quirky nickname on purchase (hal9000, glados, the-basement, works-on-my-machine, ...) instead of a generic "Old Desktop #2".',
+      'Nicknames replace the old numbering scheme everywhere a host is named - the rack view, hardware panel, service rows, and deploy log.',
+    ],
+  },
+  {
+    version: '0.3.0',
+    date: '2026-07-02',
+    changes: [
+      'The service dropdown now shows RAM/power cost per service, and greys out anything that would not fit on the currently selected host.',
+      'You can now buy a second (third, fourth...) unit of hardware you already own, not just upgrade to the next tier - each extra unit of a tier costs 40% more than the last. Meant as a bridge across the long early-game gap between tiers.',
+      'Hardware/service labels now number duplicate tiers ("Old Desktop #2") since more than one host of the same spec can now exist.',
+    ],
+  },
+  {
+    version: '0.2.0',
+    date: '2026-07-02',
+    changes: [
+      'Added service quirks - a random per-instance trait rolled on deploy (Overclocked, Chatty, Legacy, Well-documented, Flaky, Artisanal) that shifts production and crash risk.',
+      'Added 3 services: Homepage (Dashboard), Grafana (Monitoring), Matrix Synapse (Chat).',
+      'Added the ASCII rack view and this help/changelog overlay.',
+    ],
+  },
+  {
+    version: '0.1.4',
+    date: '2026-07-02',
+    changes: ['Added a Vitest suite covering the core loop and data-balance invariants.'],
+  },
+  {
+    version: '0.1.3',
+    date: '2026-07-02',
+    changes: ['Added service uninstall (`rm` button) - frees host capacity, refunds 25% of deploy cost.'],
+  },
+  {
+    version: '0.1.2',
+    date: '2026-07-02',
+    changes: [
+      'Fixed: RAM/power capacity was one shared pool across all hardware, ignoring which host you selected. Now enforced per-host.',
+      'Service rows and hardware rows now show host name and per-host usage.',
+    ],
+  },
+  {
+    version: '0.1.1',
+    date: '2026-07-02',
+    changes: [
+      'Fixed a soft-lock: the crash-fix cooldown was global across all services. Two crashes at once could strand you with zero income. Cooldown is now per-service.',
+      'Fixed the service dropdown closing itself - the whole UI was rebuilding every 250ms.',
+    ],
+  },
+  {
+    version: '0.1.0',
+    date: '2026-07-02',
+    changes: [
+      'Initial build: hardware tiers, 11 services, 9 upgrades, random events, and prestige.',
+    ],
+  },
+]
diff --git a/src/engine.test.ts b/src/engine.test.ts
new file mode 100644
index 0000000..ee0d209
--- /dev/null
+++ b/src/engine.test.ts
@@ -0,0 +1,493 @@
+import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'
+import { HARDWARE } from './data/hardware'
+import { SERVICES } from './data/services'
+import { UPGRADES } from './data/upgrades'
+import { QUIRKS, QUIRK_CHANCE } from './data/quirks'
+import { HOSTNAMES, pickHostname } from './data/hostnames'
+import { newGame } from './state'
+import {
+  buyHardware,
+  buyUpgrade,
+  canFix,
+  canPrestige,
+  capacity,
+  deployService,
+  fixService,
+  hardwareCost,
+  hostCapacity,
+  prestige,
+  quirkDef,
+  ratePerSec,
+  tick,
+  totalRate,
+  uninstallService,
+} from './engine'
+
+describe('bootstrap', () => {
+  it('starts with enough points to deploy the cheapest service immediately', () => {
+    const state = newGame()
+    const cheapest = Math.min(...SERVICES.map((s) => s.deployCost))
+    expect(state.points).toBeGreaterThanOrEqual(cheapest)
+  })
+
+  it('starts with one Pi 4 and no services', () => {
+    const state = newGame()
+    expect(state.hardware).toHaveLength(1)
+    expect(state.hardware[0].defId).toBe('pi4')
+    expect(state.services).toHaveLength(0)
+  })
+})
+
+describe('deployService', () => {
+  it('deploys onto the selected host and deducts points', () => {
+    const state = newGame()
+    const before = state.points
+    const ok = deployService(state, 'nginx', state.hardware[0].id)
+    expect(ok).toBe(true)
+    expect(state.services).toHaveLength(1)
+    expect(state.services[0].hardwareId).toBe(state.hardware[0].id)
+    expect(state.points).toBe(before - SERVICES.find((s) => s.id === 'nginx')!.deployCost)
+  })
+
+  it('refuses to deploy without enough points', () => {
+    const state = newGame()
+    state.points = 0
+    expect(deployService(state, 'nginx', state.hardware[0].id)).toBe(false)
+    expect(state.services).toHaveLength(0)
+  })
+
+  it('enforces capacity against the specific host, not a shared pool', () => {
+    const state = newGame()
+    state.points = 100000
+    state.hardware.push({ id: 'hw-2', defId: 'desktop', nickname: 'test-desktop' })
+
+    // Pi 4 has 2 RAM slots - fill it with two 1-RAM services.
+    expect(deployService(state, 'nginx', state.hardware[0].id)).toBe(true)
+    expect(deployService(state, 'pihole', state.hardware[0].id)).toBe(true)
+    // Third 1-RAM service should not fit on the now-full Pi...
+    expect(deployService(state, 'wireguard', state.hardware[0].id)).toBe(false)
+    // ...but should fit fine on the Desktop, which has its own budget.
+    expect(deployService(state, 'wireguard', 'hw-2')).toBe(true)
+  })
+
+  it('rejects deploying to a host without enough power budget', () => {
+    const state = newGame()
+    state.points = 100000
+    // Pi 4 has a 3-power budget; jellyfin alone costs 4 power.
+    expect(deployService(state, 'jellyfin', state.hardware[0].id)).toBe(false)
+  })
+})
+
+describe('hostCapacity vs capacity', () => {
+  it('capacity() aggregates every host; hostCapacity() isolates one', () => {
+    const state = newGame()
+    state.points = 100000
+    state.hardware.push({ id: 'hw-2', defId: 'desktop', nickname: 'test-desktop' })
+    deployService(state, 'nginx', state.hardware[0].id)
+    deployService(state, 'wireguard', 'hw-2')
+
+    const agg = capacity(state)
+    expect(agg.ramUsed).toBe(2)
+
+    const piCap = hostCapacity(state, state.hardware[0].id)
+    expect(piCap.ramUsed).toBe(1)
+    const desktopCap = hostCapacity(state, 'hw-2')
+    expect(desktopCap.ramUsed).toBe(1)
+  })
+})
+
+describe('buyHardware', () => {
+  it('deducts cost and adds the hardware', () => {
+    const state = newGame()
+    state.points = 1000
+    expect(buyHardware(state, 'desktop')).toBe(true)
+    expect(state.hardware).toHaveLength(2)
+    expect(state.points).toBe(1000 - HARDWARE.find((h) => h.id === 'desktop')!.cost)
+  })
+
+  it('refuses when the player cannot afford it', () => {
+    const state = newGame()
+    state.points = 0
+    expect(buyHardware(state, 'desktop')).toBe(false)
+    expect(state.hardware).toHaveLength(1)
+  })
+
+  it('allows buying a second unit of an already-owned tier, as a separate host', () => {
+    const state = newGame()
+    state.points = 100000
+    buyHardware(state, 'desktop')
+    expect(buyHardware(state, 'desktop')).toBe(true)
+    expect(state.hardware.filter((h) => h.defId === 'desktop')).toHaveLength(2)
+    expect(state.hardware[1].id).not.toBe(state.hardware[2].id)
+  })
+
+  it('each extra unit of the same tier costs more than the last', () => {
+    const state = newGame()
+    state.points = 100000
+    const first = hardwareCost(state, 'desktop')
+    buyHardware(state, 'desktop')
+    const second = hardwareCost(state, 'desktop')
+    buyHardware(state, 'desktop')
+    const third = hardwareCost(state, 'desktop')
+
+    expect(second).toBeGreaterThan(first)
+    expect(third).toBeGreaterThan(second)
+  })
+
+  it('refuses to rebuy the free starter Pi', () => {
+    const state = newGame()
+    state.points = 100000
+    expect(hardwareCost(state, 'pi4')).toBe(0)
+    expect(buyHardware(state, 'pi4')).toBe(false)
+    expect(state.hardware).toHaveLength(1)
+  })
+})
+
+describe('buyUpgrade', () => {
+  it('respects prerequisite chains', () => {
+    const state = newGame()
+    state.points = 100000
+    expect(buyUpgrade(state, 'backups2')).toBe(false) // requires backups1
+    expect(buyUpgrade(state, 'backups1')).toBe(true)
+    expect(buyUpgrade(state, 'backups2')).toBe(true)
+  })
+
+  it('will not sell the same upgrade twice', () => {
+    const state = newGame()
+    state.points = 100000
+    expect(buyUpgrade(state, 'ups')).toBe(true)
+    expect(buyUpgrade(state, 'ups')).toBe(false)
+  })
+
+  it('redundancy upgrade doubles every currently deployed service', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    expect(state.services[0].redundant).toBe(false)
+    buyUpgrade(state, 'redundancy')
+    expect(state.services[0].redundant).toBe(true)
+  })
+
+  it('every upgrade id used as a `requires` target actually exists', () => {
+    const ids = new Set(UPGRADES.map((u) => u.id))
+    for (const u of UPGRADES) {
+      if (u.requires) expect(ids.has(u.requires)).toBe(true)
+    }
+  })
+})
+
+describe('fixService / crash cooldown', () => {
+  beforeEach(() => vi.useFakeTimers())
+  afterEach(() => vi.useRealTimers())
+
+  it('fixes a crashed service and restarts its age', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    const svc = state.services[0]
+    svc.status = 'crashed'
+    svc.age = 500
+
+    fixService(state, svc.id)
+    expect(svc.status).toBe('running')
+    expect(svc.age).toBe(0)
+  })
+
+  it('cannot be fixed again until its own cooldown expires', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    const svc = state.services[0]
+    svc.status = 'crashed'
+    fixService(state, svc.id)
+    expect(canFix(svc)).toBe(false)
+
+    svc.status = 'crashed'
+    fixService(state, svc.id) // blocked by cooldown
+    expect(svc.status).toBe('crashed')
+
+    vi.advanceTimersByTime(20_001)
+    expect(canFix(svc)).toBe(true)
+    fixService(state, svc.id)
+    expect(svc.status).toBe('running')
+  })
+
+  it('a cooldown on one service does not block fixing a different crashed service', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    deployService(state, 'pihole', state.hardware[0].id)
+    const [a, b] = state.services
+    a.status = 'crashed'
+    b.status = 'crashed'
+
+    fixService(state, a.id)
+    expect(a.status).toBe('running')
+    // b must still be fixable immediately - this was the soft-lock bug.
+    expect(canFix(b)).toBe(true)
+    fixService(state, b.id)
+    expect(b.status).toBe('running')
+  })
+})
+
+describe('uninstallService', () => {
+  it('removes the service, frees capacity, and refunds partial value', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    const svc = state.services[0]
+    const beforePoints = state.points
+    const beforeCap = hostCapacity(state, state.hardware[0].id)
+
+    uninstallService(state, svc.id)
+
+    expect(state.services).toHaveLength(0)
+    expect(state.points).toBeGreaterThan(beforePoints)
+    const afterCap = hostCapacity(state, state.hardware[0].id)
+    expect(afterCap.ramUsed).toBeLessThan(beforeCap.ramUsed)
+  })
+
+  it('refunds double for a redundant instance', () => {
+    const single = newGame()
+    single.points = 100000
+    deployService(single, 'nginx', single.hardware[0].id)
+    const singleBefore = single.points
+    uninstallService(single, single.services[0].id)
+    const singleRefund = single.points - singleBefore
+
+    const redundant = newGame()
+    redundant.points = 100000
+    deployService(redundant, 'nginx', redundant.hardware[0].id)
+    redundant.services[0].redundant = true
+    const redundantBefore = redundant.points
+    uninstallService(redundant, redundant.services[0].id)
+    const redundantRefund = redundant.points - redundantBefore
+
+    expect(redundantRefund).toBe(singleRefund * 2)
+  })
+})
+
+describe('production / tick', () => {
+  beforeEach(() => vi.useFakeTimers())
+  afterEach(() => vi.useRealTimers())
+
+  it('accrues points over time proportional to the running rate', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    const rate = totalRate(state)
+    expect(rate).toBeGreaterThan(0)
+
+    const before = state.points
+    tick(state, 10)
+    expect(state.points).toBeCloseTo(before + rate * 10, 5)
+    expect(state.totalEarned).toBeCloseTo(rate * 10, 5)
+  })
+
+  it('produces nothing during an outage', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    state.outageUntil = Date.now() + 10_000
+    const before = state.points
+    tick(state, 5)
+    expect(state.points).toBe(before)
+  })
+
+  it('a crashed service produces zero even if others run', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    deployService(state, 'pihole', state.hardware[0].id)
+    state.services[0].status = 'crashed'
+    expect(ratePerSec(state, state.services[0])).toBe(0)
+    expect(totalRate(state)).toBe(ratePerSec(state, state.services[1]))
+  })
+
+  it('service age increases only while running', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    state.services[0].status = 'crashed'
+    tick(state, 100)
+    expect(state.services[0].age).toBe(0)
+  })
+})
+
+describe('prestige', () => {
+  it('is not available before the earnings threshold', () => {
+    const state = newGame()
+    state.totalEarned = 49999
+    expect(canPrestige(state)).toBe(false)
+    state.totalEarned = 50000
+    expect(canPrestige(state)).toBe(true)
+  })
+
+  it('resets progress but carries forward a strictly higher multiplier', () => {
+    const state = newGame()
+    state.points = 100000
+    state.totalEarned = 50000
+    deployService(state, 'nginx', state.hardware[0].id)
+    buyUpgrade(state, 'ups')
+    const prevMultiplier = state.prestigeMultiplier
+
+    const fresh = prestige(state)
+
+    expect(fresh.prestigeMultiplier).toBeGreaterThan(prevMultiplier)
+    expect(fresh.services).toHaveLength(0)
+    expect(fresh.upgrades).toHaveLength(0)
+    expect(fresh.hardware).toHaveLength(1)
+    expect(fresh.prestigeCount).toBe(state.prestigeCount + 1)
+  })
+
+  it('the carried multiplier actually boosts future production', () => {
+    // deployService can roll a random quirk (see data/quirks.ts) that also
+    // scales the rate, so pin Math.random to 1 (just under the ceiling) to
+    // guarantee no quirk is assigned to either deploy - otherwise this
+    // comparison is flaky whenever the two independent rolls disagree.
+    const randomSpy = vi.spyOn(Math, 'random').mockReturnValue(0.999)
+
+    const base = newGame()
+    base.points = 100000
+    deployService(base, 'nginx', base.hardware[0].id)
+    const baseRate = ratePerSec(base, base.services[0])
+
+    const boosted = newGame()
+    boosted.prestigeMultiplier = 2
+    boosted.points = 100000
+    deployService(boosted, 'nginx', boosted.hardware[0].id)
+    const boostedRate = ratePerSec(boosted, boosted.services[0])
+
+    randomSpy.mockRestore()
+
+    expect(boostedRate).toBeCloseTo(baseRate * 2, 5)
+  })
+})
+
+describe('balance sanity', () => {
+  it('hardware costs strictly increase with tier, matching the RAM/power increase', () => {
+    for (let i = 1; i < HARDWARE.length; i++) {
+      expect(HARDWARE[i].cost).toBeGreaterThan(HARDWARE[i - 1].cost)
+      expect(HARDWARE[i].ramSlots).toBeGreaterThan(HARDWARE[i - 1].ramSlots)
+      expect(HARDWARE[i].powerBudget).toBeGreaterThan(HARDWARE[i - 1].powerBudget)
+    }
+  })
+
+  it('every service pays back its deploy cost in well under an hour at base rate', () => {
+    for (const svc of SERVICES) {
+      const paybackSeconds = svc.deployCost / svc.baseRate
+      expect(paybackSeconds).toBeLessThan(3600)
+    }
+  })
+
+  it('pricier services are not worse value than cheaper ones (payback time roughly non-decreasing)', () => {
+    const sorted = [...SERVICES].sort((a, b) => a.deployCost - b.deployCost)
+    for (const svc of sorted) {
+      const paybackSeconds = svc.deployCost / svc.baseRate
+      // Generous ceiling per PLAN.md's "first 10 minutes should feel good" -
+      // catches a service that's badly mispriced relative to its own cost.
+      expect(paybackSeconds).toBeLessThan(300)
+    }
+  })
+
+  it('crash risk stays low enough that a fresh service is unlikely to crash in its first minute', () => {
+    // Highest configured baseCrashPerSec is waste-go's 0.0025/s = 15%/min -
+    // this guards against a future service definition creeping past that
+    // ceiling by accident, not an assertion that risk must be near-zero.
+    for (const svc of SERVICES) {
+      const riskFirstMinute = svc.baseCrashPerSec * 60
+      expect(riskFirstMinute).toBeLessThan(0.16)
+    }
+  })
+
+  it('the starting balance can afford the cheapest service but not a second hardware tier', () => {
+    const state = newGame()
+    const cheapestService = Math.min(...SERVICES.map((s) => s.deployCost))
+    const cheapestHardware = Math.min(...HARDWARE.filter((h) => h.id !== 'pi4').map((h) => h.cost))
+    expect(state.points).toBeGreaterThanOrEqual(cheapestService)
+    expect(state.points).toBeLessThan(cheapestHardware)
+  })
+
+  it('the Pi 4 alone can host at least two of the cheapest services', () => {
+    const pi4 = HARDWARE.find((h) => h.id === 'pi4')!
+    const cheapest = [...SERVICES].sort((a, b) => a.deployCost - b.deployCost)[0]
+    expect(Math.floor(pi4.ramSlots / cheapest.ram)).toBeGreaterThanOrEqual(2)
+    expect(Math.floor(pi4.powerBudget / cheapest.power)).toBeGreaterThanOrEqual(2)
+  })
+})
+
+describe('quirks', () => {
+  it('never assigns a quirk when the roll lands above QUIRK_CHANCE', () => {
+    const state = newGame()
+    state.points = 100000
+    vi.spyOn(Math, 'random').mockReturnValue(QUIRK_CHANCE + 0.001)
+    deployService(state, 'nginx', state.hardware[0].id)
+    expect(state.services[0].quirkId).toBeNull()
+    vi.restoreAllMocks()
+  })
+
+  it('always assigns a quirk when the roll lands under QUIRK_CHANCE', () => {
+    const state = newGame()
+    state.points = 100000
+    vi.spyOn(Math, 'random').mockReturnValue(0)
+    deployService(state, 'nginx', state.hardware[0].id)
+    expect(state.services[0].quirkId).not.toBeNull()
+    expect(QUIRKS.some((q) => q.id === state.services[0].quirkId)).toBe(true)
+    vi.restoreAllMocks()
+  })
+
+  it('a quirk\'s rateMult actually scales ratePerSec', () => {
+    const state = newGame()
+    state.points = 100000
+    deployService(state, 'nginx', state.hardware[0].id)
+    const svc = state.services[0]
+    svc.quirkId = null
+    const unquirked = ratePerSec(state, svc)
+
+    const overclocked = QUIRKS.find((q) => q.id === 'overclocked')!
+    svc.quirkId = 'overclocked'
+    const quirked = ratePerSec(state, svc)
+
+    expect(quirked).toBeCloseTo(unquirked * overclocked.rateMult, 5)
+  })
+
+  it('quirkDef() is null for both no quirk and an unknown id', () => {
+    expect(quirkDef(null)).toBeNull()
+    expect(quirkDef('not-a-real-quirk')).toBeNull()
+  })
+
+  it('every quirk is a real modifier, not a no-op dressed up in flavour text', () => {
+    for (const q of QUIRKS) {
+      expect(q.rateMult !== 1 || q.crashMult !== 1).toBe(true)
+    }
+  })
+})
+
+describe('hostnames', () => {
+  it('the starter Pi gets a nickname from the pool', () => {
+    const state = newGame()
+    expect(state.hardware[0].nickname).toBeTruthy()
+    expect(HOSTNAMES).toContain(state.hardware[0].nickname)
+  })
+
+  it('every purchased host gets its own nickname, never reusing one already taken', () => {
+    const state = newGame()
+    state.points = 1_000_000
+    for (let i = 0; i < 5; i++) buyHardware(state, 'desktop')
+
+    const nicknames = state.hardware.map((h) => h.nickname)
+    expect(new Set(nicknames).size).toBe(nicknames.length)
+  })
+
+  it('pickHostname never returns a name already in the taken set', () => {
+    const taken = new Set(HOSTNAMES.slice(0, HOSTNAMES.length - 1))
+    const picked = pickHostname(taken)
+    expect(taken.has(picked)).toBe(false)
+  })
+
+  it('pickHostname falls back to a numbered name once the pool is exhausted', () => {
+    const taken = new Set(HOSTNAMES)
+    const picked = pickHostname(taken)
+    expect(picked).toMatch(/^unit-\d+$/)
+  })
+})
diff --git a/src/engine.ts b/src/engine.ts
new file mode 100644
index 0000000..bf230d9
--- /dev/null
+++ b/src/engine.ts
@@ -0,0 +1,322 @@
+import { HARDWARE } from './data/hardware'
+import { SERVICES } from './data/services'
+import { UPGRADES } from './data/upgrades'
+import { QUIRKS, QUIRK_CHANCE } from './data/quirks'
+import { pickHostname } from './data/hostnames'
+import { FAN_NOISE_LINES, UPDATE_AVAILABLE_LINES, RM_RF_LINES } from './data/events'
+import type { GameState, DeployedService } from './types'
+import { nextId } from './state'
+
+const UPGRADE_LOOKUP: Record<string, (typeof UPGRADES)[number]> = Object.fromEntries(
+  UPGRADES.map((u) => [u.id, u]),
+)
+const QUIRK_LOOKUP: Record<string, (typeof QUIRKS)[number]> = Object.fromEntries(
+  QUIRKS.map((q) => [q.id, q]),
+)
+
+const MAX_LOG = 60
+
+function hwDef(defId: string) {
+  return HARDWARE.find((h) => h.id === defId)!
+}
+function svcDef(defId: string) {
+  return SERVICES.find((s) => s.id === defId)!
+}
+export function quirkDef(quirkId: string | null) {
+  return quirkId ? QUIRK_LOOKUP[quirkId] ?? null : null
+}
+
+export function log(state: GameState, text: string) {
+  state.log.unshift({ t: Date.now(), text })
+  if (state.log.length > MAX_LOG) state.log.length = MAX_LOG
+}
+
+export function capacity(state: GameState) {
+  let ram = 0
+  let power = 0
+  for (const hw of state.hardware) {
+    const def = hwDef(hw.defId)
+    ram += def.ramSlots
+    power += def.powerBudget
+  }
+  let ramUsed = 0
+  let powerUsed = 0
+  for (const svc of state.services) {
+    const def = svcDef(svc.defId)
+    const mult = svc.redundant ? 2 : 1
+    ramUsed += def.ram * mult
+    powerUsed += def.power * mult
+  }
+  return { ram, power, ramUsed, powerUsed }
+}
+
+// Capacity is enforced per host, not as one shared pool - a service
+// deployed "on the Pi" only draws from the Pi's own RAM/power budget.
+export function hostCapacity(state: GameState, hardwareId: string) {
+  const hw = state.hardware.find((h) => h.id === hardwareId)!
+  const def = hwDef(hw.defId)
+  let ramUsed = 0
+  let powerUsed = 0
+  for (const svc of state.services) {
+    if (svc.hardwareId !== hardwareId) continue
+    const svcDefinition = svcDef(svc.defId)
+    const mult = svc.redundant ? 2 : 1
+    ramUsed += svcDefinition.ram * mult
+    powerUsed += svcDefinition.power * mult
+  }
+  return { ram: def.ramSlots, power: def.powerBudget, ramUsed, powerUsed }
+}
+
+export function coolingBonus(state: GameState) {
+  return state.upgrades.includes('cooling') ? 0.6 : 1
+}
+
+export function docBonus(state: GameState) {
+  return state.upgrades.includes('documentation') ? 1.05 : 1
+}
+
+export function ratePerSec(state: GameState, svc: DeployedService): number {
+  if (svc.status !== 'running') return 0
+  const def = svcDef(svc.defId)
+  const ageBonus = Math.min(1.5, 1 + svc.age / 1800)
+  const redundantBonus = svc.redundant ? 1.5 : 1
+  const quirkBonus = quirkDef(svc.quirkId)?.rateMult ?? 1
+  return def.baseRate * ageBonus * redundantBonus * quirkBonus * docBonus(state) * state.prestigeMultiplier
+}
+
+export function totalRate(state: GameState): number {
+  if (Date.now() < state.outageUntil) return 0
+  return state.services.reduce((sum, s) => sum + ratePerSec(state, s), 0)
+}
+
+const FIX_COOLDOWN_MS = 20_000
+
+export function canFix(svc: DeployedService): boolean {
+  return Date.now() >= svc.fixCooldownUntil
+}
+
+export function fixService(state: GameState, serviceId: string) {
+  const svc = state.services.find((s) => s.id === serviceId)
+  if (!svc || svc.status !== 'crashed') return
+  if (!canFix(svc)) return
+  svc.status = 'running'
+  svc.age = 0
+  svc.fixCooldownUntil = Date.now() + FIX_COOLDOWN_MS
+  log(state, `Turned ${svcDef(svc.defId).name} off and on again. It worked. Nobody knows why.`)
+}
+
+export function uninstallService(state: GameState, serviceId: string) {
+  const idx = state.services.findIndex((s) => s.id === serviceId)
+  if (idx === -1) return
+  const svc = state.services[idx]
+  const def = svcDef(svc.defId)
+  const refund = Math.round(def.deployCost * 0.25) * (svc.redundant ? 2 : 1)
+  state.points += refund
+  state.services.splice(idx, 1)
+  log(state, `${def.name} uninstalled. Salvaged ${refund} pts in parts.`)
+}
+
+function ownedCount(state: GameState, defId: string): number {
+  return state.hardware.filter((h) => h.defId === defId).length
+}
+
+// Buying a second unit of a tier you already own is a horizontal-scaling
+// bridge (buy another Old Desktop instead of grinding for a Server), not a
+// free replacement for the vertical upgrade path - each additional unit of
+// the same tier costs 40% more than the last.
+export function hardwareCost(state: GameState, defId: string): number {
+  const def = HARDWARE.find((h) => h.id === defId)!
+  return Math.round(def.cost * Math.pow(1.4, ownedCount(state, defId)))
+}
+
+export function buyHardware(state: GameState, defId: string): boolean {
+  const def = HARDWARE.find((h) => h.id === defId)
+  if (!def) return false
+  const count = ownedCount(state, defId)
+  // The starter Pi is a one-time freebie (cost 0) - letting it be rebought
+  // for free would let RAM/power be farmed for nothing.
+  if (def.cost === 0 && count >= 1) return false
+  const cost = hardwareCost(state, defId)
+  if (state.points < cost) return false
+  state.points -= cost
+  const taken = new Set(state.hardware.map((h) => h.nickname))
+  const nickname = pickHostname(taken)
+  state.hardware.push({ id: nextId(state, 'hw'), defId, nickname })
+  log(
+    state,
+    count > 0
+      ? `Another ${def.name} acquired, christened "${nickname}". ${def.flavour}`
+      : `${def.name} acquired, christened "${nickname}". ${def.flavour}`,
+  )
+  return true
+}
+
+export function deployService(state: GameState, defId: string, hardwareId: string): boolean {
+  const def = SERVICES.find((s) => s.id === defId)
+  const hw = state.hardware.find((h) => h.id === hardwareId)
+  if (!def || !hw) return false
+  if (state.points < def.deployCost) return false
+  const cap = hostCapacity(state, hardwareId)
+  if (cap.ramUsed + def.ram > cap.ram) return false
+  if (cap.powerUsed + def.power > cap.power) return false
+  state.points -= def.deployCost
+  const quirk = Math.random() < QUIRK_CHANCE ? QUIRKS[Math.floor(Math.random() * QUIRKS.length)] : null
+  state.services.push({
+    id: nextId(state, 'svc'),
+    defId,
+    hardwareId,
+    status: 'running',
+    crashReason: '',
+    age: 0,
+    redundant: false,
+    fixCooldownUntil: 0,
+    quirkId: quirk?.id ?? null,
+  })
+  log(
+    state,
+    quirk
+      ? `${def.name} deployed. ${def.flavourDeploy} (${quirk.name}: ${quirk.flavour})`
+      : `${def.name} deployed. ${def.flavourDeploy}`,
+  )
+  return true
+}
+
+export function buyUpgrade(state: GameState, id: string): boolean {
+  if (state.upgrades.includes(id)) return false
+  const upgrade = UPGRADE_LOOKUP[id]
+  if (!upgrade) return false
+  if (upgrade.requires && !state.upgrades.includes(upgrade.requires)) return false
+  if (state.points < upgrade.cost) return false
+  state.points -= upgrade.cost
+  state.upgrades.push(id)
+  log(state, `${upgrade.name} online. ${upgrade.flavour}`)
+  if (id === 'redundancy') {
+    for (const svc of state.services) svc.redundant = true
+  }
+  return true
+}
+
+const CRASH_REASONS = ['disk full', 'OOM killed', 'bad config push', 'dependency broke', 'cosmic ray, probably']
+
+function crashChance(state: GameState, svc: DeployedService): number {
+  const def = svcDef(svc.defId)
+  const ageFactor = 1 + svc.age / 1200
+  const quirkMult = quirkDef(svc.quirkId)?.crashMult ?? 1
+  return def.baseCrashPerSec * ageFactor * quirkMult * coolingBonus(state)
+}
+
+let poissonAccumulator = 0
+
+export function tick(state: GameState, dtSeconds: number) {
+  const inOutage = Date.now() < state.outageUntil
+  state.gameTime += dtSeconds
+
+  if (!inOutage) {
+    state.points += totalRate(state) * dtSeconds
+    state.totalEarned += totalRate(state) * dtSeconds
+  }
+
+  for (const svc of state.services) {
+    if (svc.status !== 'running') continue
+    svc.age += dtSeconds
+    if (inOutage) continue
+    const p = crashChance(state, svc) * dtSeconds
+    if (Math.random() < p) {
+      const isRedundant = svc.redundant
+      const reason = CRASH_REASONS[Math.floor(Math.random() * CRASH_REASONS.length)]
+      if (isRedundant && state.upgrades.includes('redundancy')) {
+        log(state, `${svcDef(svc.defId).name} instance failed (${reason}). The other one picked up the slack.`)
+        svc.redundant = false
+        continue
+      }
+      svc.status = 'crashed'
+      svc.crashReason = reason
+      log(state, `${svcDef(svc.defId).name} crashed. ${svcDef(svc.defId).flavourCrash}`)
+      if (state.upgrades.includes('backups3') && Math.random() < 0.35) {
+        svc.status = 'running'
+        svc.age = 0
+        log(state, `${svcDef(svc.defId).name} auto-recovered (Backups III).`)
+      }
+    }
+  }
+
+  poissonAccumulator += dtSeconds
+  const eventInterval = Math.max(25, 90 - state.gameTime / 120)
+  if (poissonAccumulator > eventInterval) {
+    poissonAccumulator = 0
+    rollRandomEvent(state)
+  }
+}
+
+function rollRandomEvent(state: GameState) {
+  const running = state.services.filter((s) => s.status === 'running')
+  const roll = Math.random()
+
+  if (roll < 0.18 && running.length > 0) {
+    const svc = running[Math.floor(Math.random() * running.length)]
+    svc.status = 'crashed'
+    svc.crashReason = 'disk full'
+    log(state, `Disk full on ${svcDef(svc.defId).name}. ${svcDef(svc.defId).flavourCrash}`)
+    return
+  }
+
+  if (roll < 0.32) {
+    const hasUps = state.upgrades.includes('ups')
+    const seconds = hasUps ? 4 : 12
+    state.outageUntil = Date.now() + seconds * 1000
+    log(state, `Power outage. Everything is dark for ${seconds}s.${hasUps ? ' UPS softened the blow.' : ''}`)
+    return
+  }
+
+  if (roll < 0.45 && running.length > 0) {
+    const svc = running[Math.floor(Math.random() * running.length)]
+    svc.age = Math.max(0, svc.age - 300)
+    log(state, `Kernel panic. ${svcDef(svc.defId).name}'s host rebooted, some progress lost.`)
+    return
+  }
+
+  if (roll < 0.6) {
+    log(state, FAN_NOISE_LINES[Math.floor(Math.random() * FAN_NOISE_LINES.length)])
+    return
+  }
+
+  if (roll < 0.8) {
+    log(state, UPDATE_AVAILABLE_LINES[Math.floor(Math.random() * UPDATE_AVAILABLE_LINES.length)])
+    return
+  }
+
+  if (running.length > 0 && !state.upgrades.includes('backups1')) {
+    const idx = Math.floor(Math.random() * state.services.length)
+    const removed = state.services.splice(idx, 1)[0]
+    log(state, `${RM_RF_LINES[Math.floor(Math.random() * RM_RF_LINES.length)]} ${svcDef(removed.defId).name} is gone.`)
+    return
+  }
+
+  log(state, 'Nothing happened. Suspicious.')
+}
+
+export function canPrestige(state: GameState): boolean {
+  return state.totalEarned >= 50000
+}
+
+export function prestige(state: GameState): GameState {
+  const bonus = 1 + Math.floor(state.totalEarned / 50000) * 0.15
+  const fresh: GameState = {
+    points: 15,
+    totalEarned: 0,
+    hardware: [{ id: 'hw-1', defId: 'pi4', nickname: pickHostname(new Set()) }],
+    services: [],
+    upgrades: [],
+    log: [
+      { t: Date.now(), text: `Rack decommissioned. Multiplier now ${(state.prestigeMultiplier * bonus).toFixed(2)}x.` },
+      { t: Date.now(), text: 'A new Raspberry Pi sits on the desk. This feels familiar.' },
+    ],
+    gameTime: 0,
+    lastTick: Date.now(),
+    outageUntil: 0,
+    prestigeMultiplier: state.prestigeMultiplier * bonus,
+    prestigeCount: state.prestigeCount + 1,
+    seq: 1,
+  }
+  return fresh
+}
diff --git a/src/help.ts b/src/help.ts
new file mode 100644
index 0000000..8963bfa
--- /dev/null
+++ b/src/help.ts
@@ -0,0 +1,64 @@
+import { CHANGELOG, VERSION } from './data/version'
+
+const CONTROLS_HTML = `
+  <ul class="help-list">
+    <li>Click a <strong>hardware</strong> entry to select it as the deploy target for new services.</li>
+    <li><strong>+ deploy service</strong> installs the selected service onto the selected host, if it has RAM/power to spare.</li>
+    <li>A crashed service shows <strong>fix</strong> - each service has its own 20s cooldown after being fixed, so one crash never blocks fixing another.</li>
+    <li><strong>rm</strong> uninstalls a service (running or crashed), frees its host capacity, and refunds 25% of its deploy cost.</li>
+    <li>Services only produce points/sec - there are no secondary bonuses tied to which ones you run, beyond the odd random <em>quirk</em> rolled on deploy.</li>
+    <li>Upgrades are permanent. Some require an earlier upgrade first (shown locked with 🔒).</li>
+    <li>Crossing 50,000 lifetime points unlocks <strong>prestige</strong>: wipe your rack for a permanent production multiplier.</li>
+  </ul>
+`
+
+let modal: HTMLDivElement | null = null
+
+function close() {
+  modal?.remove()
+  modal = null
+  document.removeEventListener('keydown', onKeydown)
+}
+
+function onKeydown(e: KeyboardEvent) {
+  if (e.key === 'Escape') close()
+}
+
+export function toggleHelp() {
+  if (modal) {
+    close()
+    return
+  }
+
+  const changelogHtml = CHANGELOG.map(
+    (entry) => `
+      <div class="cl-entry">
+        <div class="cl-head"><span class="cl-version">v${entry.version}</span><span class="dim">${entry.date}</span></div>
+        <ul>${entry.changes.map((c) => `<li>${c}</li>`).join('')}</ul>
+      </div>
+    `,
+  ).join('')
+
+  modal = document.createElement('div')
+  modal.id = 'help-modal'
+  modal.innerHTML = `
+    <div class="help-box">
+      <div class="help-head">
+        <span>rack <span class="dim">v${VERSION}</span></span>
+        <button class="help-close" aria-label="Close">×</button>
+      </div>
+      <div class="help-body">
+        <h3>HOW THIS WORKS</h3>
+        ${CONTROLS_HTML}
+        <h3>CHANGELOG</h3>
+        ${changelogHtml}
+      </div>
+    </div>
+  `
+  modal.addEventListener('click', (e) => {
+    if (e.target === modal) close()
+  })
+  modal.querySelector('.help-close')!.addEventListener('click', close)
+  document.body.appendChild(modal)
+  document.addEventListener('keydown', onKeydown)
+}
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..6715fee
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,50 @@
+import './style.css'
+import { load, newGame, save } from './state'
+import { tick } from './engine'
+import { render } from './ui'
+import { toggleHelp } from './help'
+
+const app = document.querySelector<HTMLDivElement>('#app')!
+const state = load() ?? newGame()
+
+function scheduleRender() {
+  render(app, state, scheduleRender)
+}
+
+let last = performance.now()
+// Passive UI refresh - user actions call scheduleRender() directly for
+// instant feedback, so this only needs to be fast enough to reflect the
+// tick loop's background crashes/events/points ticking up.
+const RENDER_MS = 1000
+
+function loop(now: number) {
+  const dt = (now - last) / 1000
+  last = now
+  if (dt > 0) tick(state, Math.min(dt, 5))
+  requestAnimationFrame(loop)
+}
+
+function renderLoop() {
+  // Skip the rebuild while a <select> is focused - recreating it mid-render
+  // forces any open native dropdown to close immediately.
+  const active = document.activeElement
+  if (!(active instanceof HTMLSelectElement)) {
+    scheduleRender()
+  }
+  setTimeout(renderLoop, RENDER_MS)
+}
+
+requestAnimationFrame(loop)
+renderLoop()
+
+window.addEventListener('beforeunload', () => save(state))
+window.addEventListener('visibilitychange', () => {
+  if (document.hidden) save(state)
+})
+
+window.addEventListener('keydown', (e) => {
+  if (e.key !== '?') return
+  const active = document.activeElement
+  if (active instanceof HTMLSelectElement || active instanceof HTMLInputElement) return
+  toggleHelp()
+})
diff --git a/src/state.ts b/src/state.ts
new file mode 100644
index 0000000..c34577d
--- /dev/null
+++ b/src/state.ts
@@ -0,0 +1,54 @@
+import type { GameState } from './types'
+import { pickHostname } from './data/hostnames'
+
+const SAVE_KEY = 'rack-save-v1'
+
+export function newGame(): GameState {
+  return {
+    points: 15,
+    totalEarned: 0,
+    hardware: [{ id: 'hw-1', defId: 'pi4', nickname: pickHostname(new Set()) }],
+    services: [],
+    upgrades: [],
+    log: [{ t: Date.now(), text: 'A Raspberry Pi sits on the desk. It boots. That is the whole plan so far.' }],
+    gameTime: 0,
+    lastTick: Date.now(),
+    outageUntil: 0,
+    prestigeMultiplier: 1,
+    prestigeCount: 0,
+    seq: 1,
+  }
+}
+
+export function save(state: GameState) {
+  localStorage.setItem(SAVE_KEY, JSON.stringify(state))
+}
+
+export function load(): GameState | null {
+  const raw = localStorage.getItem(SAVE_KEY)
+  if (!raw) return null
+  try {
+    const parsed = JSON.parse(raw) as GameState
+    if (typeof parsed.points !== 'number' || !Array.isArray(parsed.hardware)) return null
+    // Migrate saves from before hosts had nicknames.
+    const taken = new Set(parsed.hardware.map((h) => h.nickname).filter(Boolean))
+    for (const hw of parsed.hardware) {
+      if (!hw.nickname) {
+        hw.nickname = pickHostname(taken)
+        taken.add(hw.nickname)
+      }
+    }
+    return parsed
+  } catch {
+    return null
+  }
+}
+
+export function wipe() {
+  localStorage.removeItem(SAVE_KEY)
+}
+
+export function nextId(state: GameState, prefix: string): string {
+  state.seq += 1
+  return `${prefix}-${state.seq}`
+}
diff --git a/src/style.css b/src/style.css
new file mode 100644
index 0000000..8f0e021
--- /dev/null
+++ b/src/style.css
@@ -0,0 +1,494 @@
+@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&display=swap');
+
+:root {
+  --bg: #080808;
+  --panel: #0f0f0f;
+  --border: #1e1e1e;
+  --accent: #00e87a;
+  --accent-dim: #00e87a66;
+  --text: #d6d6d6;
+  --text-dim: #6b6b6b;
+  --danger: #ff5c5c;
+  --warn: #e8c400;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body {
+  margin: 0;
+  padding: 0;
+  background: var(--bg);
+  color: var(--text);
+  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
+  font-size: 14px;
+}
+
+#app {
+  max-width: 1100px;
+  margin: 0 auto;
+  padding: 16px;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.topbar {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  border-bottom: 1px solid var(--border);
+  padding-bottom: 12px;
+}
+
+.brand {
+  font-weight: 700;
+  font-size: 20px;
+  letter-spacing: 0.5px;
+  color: var(--accent);
+}
+
+.cursor {
+  animation: blink 1s steps(1) infinite;
+}
+
+@keyframes blink {
+  50% {
+    opacity: 0;
+  }
+}
+
+.stat {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  font-size: 14px;
+}
+
+.arrow {
+  color: var(--accent);
+}
+
+.rate {
+  color: var(--accent);
+}
+
+.points {
+  color: var(--text);
+  font-weight: 700;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: 260px 1fr;
+  gap: 12px;
+}
+
+.col {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  min-width: 0;
+}
+
+.panel {
+  border: 1px solid var(--border);
+  background: var(--panel);
+  padding: 10px 12px;
+  border-radius: 4px;
+}
+
+.panel h2 {
+  font-size: 11px;
+  letter-spacing: 1px;
+  color: var(--text-dim);
+  margin: 0 0 8px 0;
+  font-weight: 500;
+  display: flex;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 4px 8px;
+  border-bottom: 1px dashed var(--border);
+  padding-bottom: 6px;
+}
+
+.dim {
+  color: var(--text-dim);
+  font-weight: 400;
+}
+
+.tiny {
+  font-size: 10px;
+}
+
+.list {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 6px 8px;
+  border: 1px solid transparent;
+  border-radius: 3px;
+  cursor: default;
+  font-size: 13px;
+}
+
+.item.selected {
+  border-color: var(--accent-dim);
+  background: #0d1a13;
+}
+
+.item .name {
+  flex: 1;
+}
+
+.item.hardware {
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 2px;
+}
+
+.item.upgrade {
+  cursor: pointer;
+  justify-content: space-between;
+}
+
+.item.upgrade.owned {
+  color: var(--text-dim);
+}
+
+.item.upgrade.locked {
+  opacity: 0.35;
+  cursor: not-allowed;
+}
+
+.item.upgrade.affordable .upgrade-status {
+  color: var(--accent);
+}
+
+.item.upgrade:not(.locked):not(.owned):hover {
+  background: #131313;
+}
+
+.item.service {
+  cursor: default;
+  border-bottom: 1px solid var(--border);
+  border-radius: 0;
+}
+
+.item.service.crashed {
+  color: var(--danger);
+}
+
+.status-icon {
+  width: 14px;
+}
+
+.service.running .status-icon {
+  color: var(--accent);
+}
+
+.service.crashed .status-icon {
+  color: var(--danger);
+}
+
+.value {
+  min-width: 70px;
+  text-align: right;
+}
+
+.redundant-badge {
+  color: var(--accent);
+  font-size: 10px;
+}
+
+.fix-btn {
+  background: var(--danger);
+  color: #080808;
+  border: none;
+  font-weight: 700;
+  padding: 3px 8px;
+  border-radius: 3px;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 11px;
+}
+
+.uninstall-btn {
+  background: transparent;
+  color: var(--text-dim);
+  border: 1px solid var(--border);
+  font-weight: 700;
+  padding: 3px 8px;
+  border-radius: 3px;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 11px;
+}
+
+.uninstall-btn:hover {
+  color: var(--danger);
+  border-color: var(--danger);
+}
+
+.fix-btn:disabled {
+  opacity: 0.4;
+  cursor: default;
+}
+
+.buy-btn {
+  margin-top: 8px;
+  width: 100%;
+  background: transparent;
+  border: 1px dashed var(--accent-dim);
+  color: var(--accent);
+  padding: 6px;
+  border-radius: 3px;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 12px;
+}
+
+.buy-btn:disabled {
+  opacity: 0.3;
+  cursor: not-allowed;
+  border-color: var(--border);
+  color: var(--text-dim);
+}
+
+.buy-btn:not(:disabled):hover {
+  background: #0d1a13;
+}
+
+.deploy-row {
+  display: flex;
+  gap: 6px;
+  margin-top: 8px;
+}
+
+.svc-select {
+  flex: 1;
+  background: var(--bg);
+  color: var(--text);
+  border: 1px solid var(--border);
+  font-family: inherit;
+  font-size: 12px;
+  padding: 4px;
+  border-radius: 3px;
+}
+
+.deploy-row .buy-btn {
+  width: auto;
+  margin-top: 0;
+  white-space: nowrap;
+}
+
+.log-panel {
+  flex: 1;
+  min-height: 200px;
+  display: flex;
+  flex-direction: column;
+}
+
+.log-list {
+  overflow-y: auto;
+  max-height: 320px;
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  font-size: 12px;
+}
+
+.log-line {
+  color: var(--text-dim);
+  line-height: 1.5;
+}
+
+.log-time {
+  color: #3d3d3d;
+  margin-right: 6px;
+}
+
+.prestige-banner {
+  border: 1px solid var(--accent-dim);
+  background: #0d1a13;
+  padding: 10px 14px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  border-radius: 4px;
+  font-size: 12px;
+}
+
+.prestige-btn {
+  width: auto;
+  margin-top: 0;
+  white-space: nowrap;
+  padding: 6px 14px;
+}
+
+.help-btn {
+  background: transparent;
+  color: var(--text-dim);
+  border: 1px solid var(--border);
+  border-radius: 50%;
+  width: 22px;
+  height: 22px;
+  line-height: 1;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.help-btn:hover {
+  color: var(--accent);
+  border-color: var(--accent-dim);
+}
+
+.quirk-badge {
+  color: var(--warn);
+  font-size: 10px;
+  border: 1px solid #4a3f00;
+  border-radius: 3px;
+  padding: 1px 4px;
+}
+
+.rack-art-panel {
+  overflow-x: auto;
+}
+
+.rack-art {
+  margin: 0;
+  font-family: inherit;
+  font-size: 12px;
+  line-height: 1.8;
+}
+
+.rack-art-line {
+  white-space: pre;
+}
+
+.rack-host-name {
+  color: var(--text-dim);
+}
+
+.slot-running {
+  color: var(--accent);
+}
+
+.slot-crashed {
+  color: var(--danger);
+}
+
+#help-modal {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.75);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 100;
+  padding: 20px;
+}
+
+.help-box {
+  background: var(--panel);
+  border: 1px solid var(--accent-dim);
+  border-radius: 4px;
+  width: 100%;
+  max-width: 620px;
+  max-height: 80vh;
+  display: flex;
+  flex-direction: column;
+  font-family: inherit;
+}
+
+.help-head {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border);
+  color: var(--accent);
+  font-weight: 700;
+}
+
+.help-close {
+  background: transparent;
+  border: none;
+  color: var(--text-dim);
+  font-size: 20px;
+  cursor: pointer;
+  line-height: 1;
+}
+
+.help-close:hover {
+  color: var(--danger);
+}
+
+.help-body {
+  padding: 14px 16px;
+  overflow-y: auto;
+  font-size: 12px;
+}
+
+.help-body h3 {
+  color: var(--text-dim);
+  font-size: 11px;
+  letter-spacing: 1px;
+  margin: 16px 0 8px 0;
+}
+
+.help-body h3:first-child {
+  margin-top: 0;
+}
+
+.help-list {
+  margin: 0;
+  padding-left: 18px;
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  line-height: 1.5;
+}
+
+.cl-entry {
+  margin-bottom: 12px;
+}
+
+.cl-head {
+  display: flex;
+  gap: 8px;
+  align-items: baseline;
+  margin-bottom: 4px;
+}
+
+.cl-version {
+  color: var(--accent);
+  font-weight: 700;
+}
+
+.cl-entry ul {
+  margin: 0;
+  padding-left: 18px;
+  color: var(--text-dim);
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  line-height: 1.5;
+}
+
+@media (max-width: 720px) {
+  .grid {
+    grid-template-columns: 1fr;
+  }
+}
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..1c19de6
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,75 @@
+export interface HardwareDef {
+  id: string
+  name: string
+  flavour: string
+  cost: number
+  ramSlots: number
+  powerBudget: number
+}
+
+export interface ServiceDef {
+  id: string
+  name: string
+  category: string
+  deployCost: number
+  ram: number
+  power: number
+  baseRate: number
+  baseCrashPerSec: number
+  flavourDeploy: string
+  flavourCrash: string
+}
+
+export interface UpgradeDef {
+  id: string
+  name: string
+  cost: number
+  flavour: string
+  requires?: string
+}
+
+export interface QuirkDef {
+  id: string
+  name: string
+  flavour: string
+  rateMult: number
+  crashMult: number
+}
+
+export interface OwnedHardware {
+  id: string
+  defId: string
+  nickname: string
+}
+
+export interface DeployedService {
+  id: string
+  defId: string
+  hardwareId: string
+  status: 'running' | 'crashed'
+  crashReason: string
+  age: number
+  redundant: boolean
+  fixCooldownUntil: number
+  quirkId: string | null
+}
+
+export interface LogEntry {
+  t: number
+  text: string
+}
+
+export interface GameState {
+  points: number
+  totalEarned: number
+  hardware: OwnedHardware[]
+  services: DeployedService[]
+  upgrades: string[]
+  log: LogEntry[]
+  gameTime: number
+  lastTick: number
+  outageUntil: number
+  prestigeMultiplier: number
+  prestigeCount: number
+  seq: number
+}
diff --git a/src/ui.ts b/src/ui.ts
new file mode 100644
index 0000000..659ec10
--- /dev/null
+++ b/src/ui.ts
@@ -0,0 +1,352 @@
+import { HARDWARE } from './data/hardware'
+import { SERVICES } from './data/services'
+import { UPGRADES } from './data/upgrades'
+import type { GameState } from './types'
+import {
+  buyHardware,
+  buyUpgrade,
+  canFix,
+  canPrestige,
+  capacity,
+  deployService,
+  fixService,
+  hardwareCost,
+  hostCapacity,
+  prestige,
+  quirkDef,
+  ratePerSec,
+  totalRate,
+  uninstallService,
+} from './engine'
+import { save } from './state'
+import { toggleHelp } from './help'
+
+// Short codes for the ASCII rack view - kept distinct from data/services.ts
+// since they're purely a display concern, not part of a service's identity.
+const SERVICE_ABBR: Record<string, string> = {
+  nginx: 'NG',
+  homepage: 'HP',
+  pihole: 'PH',
+  wireguard: 'WG',
+  gitea: 'GT',
+  nextcloud: 'NC',
+  vaultwarden: 'VW',
+  jellyfin: 'JF',
+  uptimekuma: 'UK',
+  grafana: 'GF',
+  giteaactions: 'GA',
+  immich: 'IM',
+  synapse: 'MX',
+  wastego: 'W8',
+}
+
+function fmt(n: number): string {
+  if (n < 1000) return n.toFixed(1)
+  const units = ['k', 'M', 'B', 'T', 'Q']
+  let u = -1
+  let v = n
+  while (v >= 1000 && u < units.length - 1) {
+    v /= 1000
+    u++
+  }
+  return `${v.toFixed(2)}${units[u]}`
+}
+
+function timeAgo(t: number): string {
+  const d = new Date(t)
+  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' })
+}
+
+let selectedHardwareId: string | null = null
+
+// Every host gets a random nickname on purchase (src/data/hostnames.ts),
+// which doubles as disambiguation now that multiple hosts can share a tier
+// (e.g. two Old Desktops) - no need to number them.
+function hostLabel(state: GameState, hardwareId: string): string {
+  const hw = state.hardware.find((h) => h.id === hardwareId)
+  if (!hw) return 'unknown host'
+  const def = HARDWARE.find((h) => h.id === hw.defId)!
+  return `${hw.nickname} (${def.name})`
+}
+
+export function render(root: HTMLElement, state: GameState, onChange: () => void) {
+  const cap = capacity(state)
+  const rate = totalRate(state)
+  const inOutage = Date.now() < state.outageUntil
+
+  if (!selectedHardwareId || !state.hardware.find((h) => h.id === selectedHardwareId)) {
+    selectedHardwareId = state.hardware[0]?.id ?? null
+  }
+
+  const prevLogScroll = root.querySelector('.log-list')?.scrollTop
+
+  root.innerHTML = ''
+  root.appendChild(buildHeader(state, rate, inOutage))
+  root.appendChild(buildRackArt(state))
+
+  const grid = document.createElement('div')
+  grid.className = 'grid'
+  grid.appendChild(buildLeftColumn(state, cap, onChange))
+  grid.appendChild(buildRightColumn(state, onChange))
+  root.appendChild(grid)
+
+  if (prevLogScroll !== undefined) {
+    const logList = root.querySelector('.log-list')
+    if (logList) logList.scrollTop = prevLogScroll
+  }
+
+  if (canPrestige(state)) {
+    root.appendChild(buildPrestigeBanner(state, onChange))
+  }
+
+  save(state)
+}
+
+function buildHeader(state: GameState, rate: number, inOutage: boolean): HTMLElement {
+  const header = document.createElement('header')
+  header.className = 'topbar'
+  header.innerHTML = `
+    <div class="brand">rack<span class="cursor">_</span></div>
+    <div class="stat">
+      <span class="arrow">${inOutage ? '✗' : '▲'}</span>
+      <span class="rate">${inOutage ? 'OUTAGE' : `${fmt(rate)} pts/sec`}</span>
+      <span class="points">${fmt(state.points)} pts</span>
+      <button class="help-btn" title="Help & changelog (?)">?</button>
+    </div>
+  `
+  header.querySelector('.help-btn')!.addEventListener('click', () => toggleHelp())
+  return header
+}
+
+function buildRackArt(state: GameState): HTMLElement {
+  const section = document.createElement('section')
+  section.className = 'panel rack-art-panel'
+  section.innerHTML = `<h2>RACK</h2>`
+  const pre = document.createElement('pre')
+  pre.className = 'rack-art'
+
+  for (const hw of state.hardware) {
+    const hostCap = hostCapacity(state, hw.id)
+    const line = document.createElement('div')
+    line.className = 'rack-art-line'
+
+    const badges = state.services
+      .filter((s) => s.hardwareId === hw.id)
+      .map((s) => {
+        const abbr = SERVICE_ABBR[s.defId] ?? '??'
+        const quirk = quirkDef(s.quirkId)
+        const cls = s.status === 'running' ? 'slot-running' : 'slot-crashed'
+        return `<span class="${cls}" title="${SERVICES.find((d) => d.id === s.defId)!.name}${quirk ? ` — ${quirk.name}` : ''}">[${abbr}]</span>`
+      })
+      .join('')
+
+    const freeSlots = Math.max(0, hostCap.ram - hostCap.ramUsed)
+    const dots = '·'.repeat(Math.min(freeSlots, 20))
+
+    line.innerHTML = `<span class="rack-host-name">${hw.nickname.padEnd(16, ' ')}</span>${badges}<span class="dim">${dots}</span>`
+    pre.appendChild(line)
+  }
+  section.appendChild(pre)
+  return section
+}
+
+function buildLeftColumn(state: GameState, cap: ReturnType<typeof capacity>, onChange: () => void): HTMLElement {
+  const col = document.createElement('div')
+  col.className = 'col left'
+
+  const hwSection = document.createElement('section')
+  hwSection.className = 'panel'
+  hwSection.innerHTML = `<h2>HARDWARE <span class="dim">Σ ram ${cap.ramUsed}/${cap.ram} · pwr ${cap.powerUsed}/${cap.power}</span></h2>`
+  const hwList = document.createElement('div')
+  hwList.className = 'list'
+  for (const hw of state.hardware) {
+    const def = HARDWARE.find((h) => h.id === hw.defId)!
+    const hostCap = hostCapacity(state, hw.id)
+    const item = document.createElement('div')
+    item.className = 'item hardware' + (hw.id === selectedHardwareId ? ' selected' : '')
+    item.innerHTML = `<span class="name">${hostLabel(state, hw.id)}</span><span class="dim tiny">ram ${hostCap.ramUsed}/${hostCap.ram} · pwr ${hostCap.powerUsed}/${hostCap.power}</span>`
+    item.title = `${def.flavour} (click to select as the deploy target)`
+    item.onclick = () => {
+      selectedHardwareId = hw.id
+      onChange()
+    }
+    hwList.appendChild(item)
+  }
+  hwSection.appendChild(hwList)
+
+  // Highest-tier hardware the player already owns - buying another unit of
+  // it is a horizontal bridge (more capacity now, at a rising price) for
+  // the often-long grind between one tier's cost and the next tier's.
+  const topOwnedHw = [...state.hardware]
+    .map((h) => HARDWARE.find((d) => d.id === h.defId)!)
+    .sort((a, b) => HARDWARE.indexOf(b) - HARDWARE.indexOf(a))[0]
+  if (topOwnedHw && topOwnedHw.cost > 0) {
+    const repeatCost = hardwareCost(state, topOwnedHw.id)
+    const repeatBtn = document.createElement('button')
+    repeatBtn.className = 'buy-btn'
+    repeatBtn.textContent = `+ buy another ${topOwnedHw.name} (${fmt(repeatCost)})`
+    repeatBtn.disabled = state.points < repeatCost
+    repeatBtn.title = `Add a second ${topOwnedHw.name} as its own host, at a rising price per extra unit.`
+    repeatBtn.onclick = () => {
+      if (buyHardware(state, topOwnedHw.id)) onChange()
+    }
+    hwSection.appendChild(repeatBtn)
+  }
+
+  const nextHw = HARDWARE.find((h) => !state.hardware.some((owned) => owned.defId === h.id))
+  if (nextHw) {
+    const buyBtn = document.createElement('button')
+    buyBtn.className = 'buy-btn'
+    buyBtn.textContent = `+ buy ${nextHw.name} (${fmt(nextHw.cost)})`
+    buyBtn.disabled = state.points < nextHw.cost
+    buyBtn.title = nextHw.flavour
+    buyBtn.onclick = () => {
+      if (buyHardware(state, nextHw.id)) onChange()
+    }
+    hwSection.appendChild(buyBtn)
+  }
+  col.appendChild(hwSection)
+
+  const upSection = document.createElement('section')
+  upSection.className = 'panel'
+  upSection.innerHTML = `<h2>UPGRADES</h2>`
+  const upList = document.createElement('div')
+  upList.className = 'list'
+  for (const up of UPGRADES) {
+    const owned = state.upgrades.includes(up.id)
+    const lockedByReq = up.requires ? !state.upgrades.includes(up.requires) : false
+    const row = document.createElement('div')
+    row.className = 'item upgrade' + (owned ? ' owned' : '') + (lockedByReq ? ' locked' : '')
+    row.title = up.flavour
+    row.innerHTML = `<span class="name">${up.name}</span><span class="upgrade-status">${
+      owned ? '✓' : lockedByReq ? '🔒' : fmt(up.cost)
+    }</span>`
+    if (!owned && !lockedByReq) {
+      row.onclick = () => {
+        if (buyUpgrade(state, up.id)) onChange()
+      }
+      row.classList.toggle('affordable', state.points >= up.cost)
+    }
+    upList.appendChild(row)
+  }
+  upSection.appendChild(upList)
+  col.appendChild(upSection)
+
+  return col
+}
+
+function buildRightColumn(state: GameState, onChange: () => void): HTMLElement {
+  const col = document.createElement('div')
+  col.className = 'col right'
+
+  const svcSection = document.createElement('section')
+  svcSection.className = 'panel'
+  svcSection.innerHTML = `<h2>SERVICES</h2>`
+  const svcList = document.createElement('div')
+  svcList.className = 'list'
+
+  const showRates = state.upgrades.includes('monitoring')
+
+  for (const svc of state.services) {
+    const def = SERVICES.find((s) => s.id === svc.defId)!
+    const row = document.createElement('div')
+    row.className = 'item service ' + svc.status
+    const rate = ratePerSec(state, svc)
+    const badge = svc.redundant ? ' <span class="redundant-badge">×2</span>' : ''
+    const quirk = quirkDef(svc.quirkId)
+    const quirkBadge = quirk ? ` <span class="quirk-badge" title="${quirk.flavour}">${quirk.name}</span>` : ''
+    row.innerHTML = `
+      <span class="status-icon">${svc.status === 'running' ? '✓' : '✗'}</span>
+      <span class="name">${def.name}${badge}${quirkBadge}</span>
+      <span class="dim tiny">${hostLabel(state, svc.hardwareId)}</span>
+      <span class="dim">${def.category}</span>
+      <span class="value">${svc.status === 'running' ? `${rate.toFixed(1)}/s` : 'CRASHED'}</span>
+      ${showRates && svc.status === 'running' ? `<span class="dim tiny">risk ${(def.baseCrashPerSec * 3600).toFixed(2)}/hr</span>` : ''}
+    `
+    if (svc.status === 'crashed') {
+      const fixBtn = document.createElement('button')
+      fixBtn.className = 'fix-btn'
+      fixBtn.textContent = canFix(svc) ? 'fix' : '...'
+      fixBtn.disabled = !canFix(svc)
+      fixBtn.onclick = (e) => {
+        e.stopPropagation()
+        fixService(state, svc.id)
+        onChange()
+      }
+      row.appendChild(fixBtn)
+    }
+    const uninstallBtn = document.createElement('button')
+    uninstallBtn.className = 'uninstall-btn'
+    uninstallBtn.textContent = 'rm'
+    uninstallBtn.title = `Uninstall ${def.name} (salvage ${Math.round(def.deployCost * 0.25) * (svc.redundant ? 2 : 1)} pts)`
+    uninstallBtn.onclick = (e) => {
+      e.stopPropagation()
+      uninstallService(state, svc.id)
+      onChange()
+    }
+    row.appendChild(uninstallBtn)
+    svcList.appendChild(row)
+  }
+  svcSection.appendChild(svcList)
+
+  const deploySection = document.createElement('div')
+  deploySection.className = 'deploy-row'
+  const select = document.createElement('select')
+  select.className = 'svc-select'
+  const targetCap = selectedHardwareId ? hostCapacity(state, selectedHardwareId) : null
+  for (const def of SERVICES) {
+    const opt = document.createElement('option')
+    opt.value = def.id
+    opt.textContent = `${def.name} — ${fmt(def.deployCost)}pts · ram ${def.ram} · pwr ${def.power}`
+    if (targetCap && (targetCap.ramUsed + def.ram > targetCap.ram || targetCap.powerUsed + def.power > targetCap.power)) {
+      opt.textContent += ' (no room on selected host)'
+      opt.disabled = true
+    }
+    select.appendChild(opt)
+  }
+  const deployBtn = document.createElement('button')
+  deployBtn.className = 'buy-btn'
+  deployBtn.textContent = '+ deploy service'
+  deployBtn.onclick = () => {
+    if (!selectedHardwareId) return
+    if (deployService(state, select.value, selectedHardwareId)) onChange()
+  }
+  deploySection.appendChild(select)
+  deploySection.appendChild(deployBtn)
+  svcSection.appendChild(deploySection)
+
+  col.appendChild(svcSection)
+
+  const logSection = document.createElement('section')
+  logSection.className = 'panel log-panel'
+  logSection.innerHTML = `<h2>LOG</h2>`
+  const logList = document.createElement('div')
+  logList.className = 'log-list'
+  for (const entry of state.log) {
+    const line = document.createElement('div')
+    line.className = 'log-line'
+    line.innerHTML = `<span class="log-time">${timeAgo(entry.t)}</span> ${entry.text}`
+    logList.appendChild(line)
+  }
+  logSection.appendChild(logList)
+  col.appendChild(logSection)
+
+  return col
+}
+
+function buildPrestigeBanner(state: GameState, onChange: () => void): HTMLElement {
+  const banner = document.createElement('div')
+  banner.className = 'prestige-banner'
+  banner.innerHTML = `<span>The rack has served its purpose. Decommission it for a permanent multiplier?</span>`
+  const btn = document.createElement('button')
+  btn.className = 'buy-btn prestige-btn'
+  btn.textContent = 'nuke it and start over'
+  btn.onclick = () => {
+    if (!confirm('This wipes your current hardware and services. The multiplier stays. Proceed?')) return
+    const fresh = prestige(state)
+    Object.assign(state, fresh)
+    onChange()
+  }
+  banner.appendChild(btn)
+  return banner
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..206b5e0
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "target": "es2023",
+    "module": "esnext",
+    "lib": ["ES2023", "DOM"],
+    "types": ["vite/client"],
+    "allowArbitraryExtensions": true,
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"]
+}
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..f499e15
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,12 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from 'vite'
+
+// Avoid the usual 5173/4173 defaults - those ports are claimed by sibling
+// projects on this machine.
+export default defineConfig({
+  server: { port: 5677, strictPort: true },
+  preview: { port: 4587, strictPort: true },
+  test: {
+    environment: 'node',
+  },
+})