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# Rule: Astro
Binding for every `.astro` file.
## Zero JS is the default
A component ships no JavaScript unless it has a `client:*` directive. Seven of
this site's ten pages ship no JS today and must continue to.
- Never add `client:load` without justifying it in the PR description.
- Prefer, in order: no JS → `client:visible``client:idle``client:load`.
- An island is a **leaf**, not a wrapper. Hydrate the tab panel, not the page.
## Islands in this project
Only these need interactivity. Anything else claiming island status is wrong:
| Island | Why | Directive |
| --------------------------------- | ---------------------------------- | ---------------- |
| Guide phase/tab switchers | click-driven panel swap | `client:visible` |
| Review desk catalog + file viewer | search, filter, fetch source files | `client:load` |
| Vote widget | talks to `vote-service/` | `client:visible` |
| Language toggle | swaps EN/PT across the page | `client:idle` |
## Structure
```astro
---
// 1. imports
// 2. Props interface
// 3. destructure Astro.props
// 4. derived values — no side effects, no fetch in components
---
<!-- markup -->
<style>
/* component-scoped */
</style>
```
- Typed props always: `interface Props { … }`, then `const { … } = Astro.props`.
- Data loading belongs in `src/content/` collections or the page frontmatter,
not inside a component.
- No barrel files (`index.ts` re-export hubs). They cost tree-shaking and invite
cycles.
## Content collections
All copy lives in `src/content/`, typed with a Zod schema in
`src/content/config.ts`. The review desk's `catalog.js` maps onto a collection
almost one-to-one — do that rather than importing a 27 KB JS file.
## Styles
- Component styles go in the component's `<style>` block. Astro scopes them.
- Only tokens and true resets live in global CSS.
- Do not port `responsive.css` verbatim. It is an override layer whose reason
for existing disappears once layout is componentized. Port what a component
needs, prove the rest is dead, delete it.
## URLs and the base path
The site is served from `/ai-for-dummies/`. Set `base` in `astro.config.mjs` and
never hand-write an absolute internal path. Use `import.meta.env.BASE_URL`.
Existing routes are load-bearing and must not change, including trailing slashes
and the review desk's query params.
## Never
- No UI framework (React/Vue/Svelte) unless a task brief explicitly calls for
it. Astro components plus a little vanilla JS cover everything here.
- No CSS framework. This site has a hand-built visual identity — see
[`theming.md`](theming.md).
- No external runtime requests. Self-host. `audit-ui.mjs` enforces it.