React + Vite + TanStack + Tailwind rules for AI coding agents

# AGENTS.md - this project

Instructions for AI coding agents working in this repository.

## Project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## Project structure

- Features live in `src/features/<name>/` with their components, hooks and tests together.
- Shared UI in `src/components/`, hooks in `src/hooks/`.

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

## React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

## Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

## TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

## Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

## Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

## Avoid

- Do not reach for global state for data that only one component tree uses.

## Reference docs

- [React docs](https://react.dev)
- [Vite docs](https://vite.dev/guide/)
- [Tailwind CSS docs](https://tailwindcss.com/docs)
- [TanStack Query docs](https://tanstack.com/query/latest)
- [Vitest docs](https://vitest.dev)
- [Zod docs](https://zod.dev)

# CLAUDE.md - this project

Project instructions for Claude Code.

## Project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## Project structure

- Features live in `src/features/<name>/` with their components, hooks and tests together.
- Shared UI in `src/components/`, hooks in `src/hooks/`.

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

## React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

## Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

## TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

## Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

## Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

## Avoid

- Do not reach for global state for data that only one component tree uses.

## Reference docs

- [React docs](https://react.dev)
- [Vite docs](https://vite.dev/guide/)
- [Tailwind CSS docs](https://tailwindcss.com/docs)
- [TanStack Query docs](https://tanstack.com/query/latest)
- [Vitest docs](https://vitest.dev)
- [Zod docs](https://zod.dev)

---
description: "Core rules for this project"
alwaysApply: true
---

# this project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

---
description: "React + Vite conventions: Single-page React app built with Vite and TypeScript."
globs: src/**/*.tsx, src/**/*.ts
alwaysApply: false
---

# React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

## Avoid

- Do not reach for global state for data that only one component tree uses.

Docs: https://react.dev, https://vite.dev/guide/

---
description: "Tailwind CSS v4 conventions: Utility-first styling with Tailwind CSS v4."
globs: **/*.css, **/*.tsx, **/*.vue, **/*.svelte, **/*.astro, **/*.html, **/*.blade.php, **/*.erb
alwaysApply: false
---

# Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

Docs: https://tailwindcss.com/docs

---
description: "TanStack Query conventions: Server-state caching with TanStack Query."
globs: **/*.tsx, **/hooks/**/*.ts
alwaysApply: false
---

# TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

Docs: https://tanstack.com/query/latest

---
description: "Vitest conventions: Unit and component tests with Vitest."
globs: **/*.test.ts, **/*.test.tsx, **/*.spec.ts
alwaysApply: false
---

# Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

Docs: https://vitest.dev

---
description: "Zod validation conventions: Runtime schema validation with Zod."
globs: **/*.ts, **/*.tsx
alwaysApply: false
---

# Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

Docs: https://zod.dev

# Cursor rules - this project

You are an expert React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation engineer working on this codebase. Follow these rules.

## Project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## Project structure

- Features live in `src/features/<name>/` with their components, hooks and tests together.
- Shared UI in `src/components/`, hooks in `src/hooks/`.

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

## React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

## Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

## TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

## Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

## Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

## Avoid

- Do not reach for global state for data that only one component tree uses.

## Reference docs

- [React docs](https://react.dev)
- [Vite docs](https://vite.dev/guide/)
- [Tailwind CSS docs](https://tailwindcss.com/docs)
- [TanStack Query docs](https://tanstack.com/query/latest)
- [Vitest docs](https://vitest.dev)
- [Zod docs](https://zod.dev)

# Copilot instructions - this project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

---
applyTo: "src/**/*.tsx,src/**/*.ts"
---

# React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

---
applyTo: "**/*.css,**/*.tsx,**/*.vue,**/*.svelte,**/*.astro,**/*.html,**/*.blade.php,**/*.erb"
---

# Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

---
applyTo: "**/*.tsx,**/hooks/**/*.ts"
---

# TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

---
applyTo: "**/*.test.ts,**/*.test.tsx,**/*.spec.ts"
---

# Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

---
applyTo: "**/*.ts,**/*.tsx"
---

# Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

---
trigger: always_on
---

# this project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

---
trigger: glob
globs: src/**/*.tsx, src/**/*.ts
---

# React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

---
trigger: glob
globs: **/*.css, **/*.tsx, **/*.vue, **/*.svelte, **/*.astro, **/*.html, **/*.blade.php, **/*.erb
---

# Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

---
trigger: glob
globs: **/*.tsx, **/hooks/**/*.ts
---

# TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

---
trigger: glob
globs: **/*.test.ts, **/*.test.tsx, **/*.spec.ts
---

# Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

---
trigger: glob
globs: **/*.ts, **/*.tsx
---

# Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

# GEMINI.md - this project

Project context for Gemini CLI.

## Project

A React + Vite + Tailwind CSS v4 + TanStack Query + Vitest + Zod validation project.

Stack: React + Vite, Tailwind CSS v4, TanStack Query, Vitest, Zod validation.

## Commands

- Dev server: `npm run dev`
- Build: `npm run build`
- Type-check: `npx tsc --noEmit`
- Lint: `npm run lint`
- Unit tests: `npx vitest run`

## Project structure

- Features live in `src/features/<name>/` with their components, hooks and tests together.
- Shared UI in `src/components/`, hooks in `src/hooks/`.

## How to work in this repo

- Read the relevant files before editing. Follow the patterns already in the codebase over these generic rules.
- Make the smallest change that solves the task. Do not refactor or reformat unrelated code.
- Before saying a task is done, run the type-check, lint and tests listed under Commands and fix what you broke.
- If requirements are ambiguous, ask one clear question instead of guessing.
- Never commit secrets, API keys or `.env` files. Use env vars and keep `.env.example` up to date.
- Do not add a new dependency when the standard library or an existing dependency already covers it.
- Ask before adding, removing or upgrading any dependency.
- Ask before changing database schemas, auth, payments or CI configuration.
- Never delete files, drop data or run destructive commands (`rm -rf`, `git push --force`, `DROP TABLE`) without explicit approval.
- Keep each change under ~200 changed lines where possible; split larger work into steps.

## React + Vite

- Function components and hooks only. No class components.
- Follow the Rules of Hooks: call hooks at the top level, never inside conditions or loops.
- Derive values during render instead of syncing them into state with `useEffect`.
- Every list item needs a stable `key` from the data, never the array index if the list can change order.
- Type component props with an exported `Props` type or interface. No `any`.
- Env vars must start with `VITE_` to reach the client, which also means they are public. Never put secrets in them.
- Lazy-load heavy routes with `React.lazy` and `Suspense`.

## Tailwind CSS v4

- Tailwind v4 is configured in CSS: `@import "tailwindcss";` plus `@theme { ... }` for design tokens. Do not create a `tailwind.config.js` unless the project already has one.
- Use theme tokens (colors, spacing) instead of arbitrary values like `w-[37px]`.
- Build responsive layouts mobile-first with `sm:`, `md:`, `lg:` prefixes.
- Extract repeated class lists into components, not `@apply` chains.
- Support dark mode with the `dark:` variant when the project uses it.

## TanStack Query

- All server data goes through `useQuery` / `useMutation`; do not copy query results into `useState`.
- Use array query keys built by a small key factory (e.g. `todoKeys.detail(id)`).
- Invalidate or update affected queries in `onSuccess` of every mutation.
- Wrap queries in custom hooks (`useTodos()`) instead of calling `useQuery` inline everywhere.

## Vitest

- Co-locate tests next to the code as `*.test.ts(x)`.
- Test behaviour through public APIs; for components use Testing Library queries by role/label.
- Mock network calls at the boundary (e.g. MSW) rather than mocking internal modules.
- Every bug fix adds a test that fails without the fix.

## Zod validation

- Validate all untrusted input (request bodies, form data, env vars, third-party API responses) with a Zod schema at the boundary.
- Derive TypeScript types from schemas with `z.infer<typeof schema>`; do not hand-write duplicate types.
- Use `safeParse` where you need to return validation errors to the user.

## Avoid

- Do not reach for global state for data that only one component tree uses.

## Reference docs

- [React docs](https://react.dev)
- [Vite docs](https://vite.dev/guide/)
- [Tailwind CSS docs](https://tailwindcss.com/docs)
- [TanStack Query docs](https://tanstack.com/query/latest)
- [Vitest docs](https://vitest.dev)
- [Zod docs](https://zod.dev)