diff --git a/CLAUDE.md b/CLAUDE.md
index 03b17edc..524d2860 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -5,57 +5,240 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ## Commands
 
 ```bash
-yarn develop        # Start development server
-yarn build          # Production build
-yarn serve          # Serve built site locally
-yarn clean          # Clear Gatsby cache (use when builds behave unexpectedly)
+yarn develop        # Start development server (hot reload)
+yarn build          # Production build (required before playwright tests)
+yarn serve          # Serve production build locally on :9000
+yarn clean          # Clear Gatsby cache — run this when builds behave unexpectedly
 yarn type-check     # TypeScript type checking without emitting
-yarn format         # Format code with Prettier
+yarn format         # Format all files with Prettier
 ```
 
 ### Testing (Playwright visual regression)
 
+Tests run against a served production build — always `yarn build && yarn serve` before running locally.
+
+```bash
+yarn playwright test                                        # Run all 30 tests
+yarn playwright test visual-regression-dark-theme.spec.ts  # Run single spec
+yarn playwright test --grep "Home Page"                     # Run by name
+yarn playwright test --update-snapshots                     # Regenerate baselines
+yarn playwright test --debug                                # Debug mode
+```
+
+The local base URL is set via `.env.local`:
+```
+PLAYWRIGHT_TEST_BASE_URL=http://localhost:9000/
+```
+
+In CI, `PLAYWRIGHT_TEST_BASE_URL` is set to the Netlify preview URL for the PR.
+
+### Snapshot baselines
+
+30 tests total: 5 pages × 2 themes (light/dark) × 3 viewports (mobile/tablet/desktop).
+
+Snapshots are stored under `tests/__screenshots__/{platform}/` where platform is auto-detected via `process.platform` in `playwright.config.ts`. No env var needed — macOS and Linux CI each use their own folder automatically.
+
+- **Local (macOS):** `tests/__screenshots__/darwin/`
+- **CI (Linux):** `tests/__screenshots__/linux/`
+
+**Updating baselines locally** (after a deliberate visual change):
 ```bash
-yarn playwright test                              # Run all tests
-yarn playwright test visual-regression.spec.ts   # Run single test file
-yarn playwright test --debug                      # Debug mode
+yarn build && yarn serve
+yarn playwright test --update-snapshots
+git add tests/__screenshots__/darwin/
 ```
 
-Tests run against a live URL. Locally defaults to `https://ajeetchaulagain.com`; override with `PLAYWRIGHT_TEST_BASE_URL`. In CI, they run against the Netlify preview deployment on PRs to master.
+**Updating CI baselines:** Trigger a CI run with `--update-snapshots` and commit the updated `tests/__screenshots__/linux/` files. The darwin and linux folders are independent — updating one doesn't affect the other.
+
+**If Gatsby caching causes a webpack error** after switching branches or reverting packages, run `yarn clean` before `yarn build`.
 
 ## Architecture
 
-**Gatsby static site** — personal portfolio/blog. Content is authored in MDX files and Gatsby dynamically generates pages from them.
+**Gatsby 5 static site** — personal portfolio/blog. Content is MDX files; Gatsby generates pages from them at build time.
 
 ### Content flow
 
-- `src/posts/` — Blog posts as MDX files → rendered via `src/templates/BlogPage/`
-- `src/projects/` — Project entries as MDX files → rendered via `src/templates/ProjectPage/`
-- `gatsby-node.ts` — Queries GraphQL for all posts/projects and programmatically creates pages
-- `gatsby-config.ts` — Plugin setup: MDX processing, Prism syntax highlighting, image optimization, sitemap, analytics
+- `src/posts/` — Blog posts as MDX → rendered via `src/templates/BlogPage/`
+- `src/projects/` — Project entries as MDX → rendered via `src/templates/ProjectPage/`
+- `gatsby-node.ts` — GraphQL queries all posts/projects and programmatically creates pages
+- `gatsby-config.ts` — Plugin setup: MDX, Prism syntax highlighting, image optimization, sitemap, analytics
 
 ### Key patterns
 
-- **Markdown decorators** (`src/markdown-decorators/`) — Custom React components injected into MDX rendering (e.g., `ProjectCardDecorator`, `BlogPostCardDecorator`, `ButtonLinkDecorator`). These are passed as components to the MDX provider so MDX authors can use them directly.
-- **Global context** (`src/contexts/GlobalContextProvider.tsx`) — App-wide state (e.g., dark/light theme). Wrapped in `gatsby-browser.js` and `gatsby-ssr.js` to apply to all pages.
-- **Styled components** throughout — use `styled-components-breakpoint` for responsive styles and `styled-components-spacing` for spacing utilities.
-- **TypeScript path alias** — `baseUrl: ./src/` in `tsconfig.json`, so imports can use `components/...`, `hooks/...`, etc. directly.
+- **Markdown decorators** (`src/markdown-decorators/`) — Custom React components injected into MDX (e.g. `BlogPostCardDecorator`, `ButtonLinkDecorator`). Registered in the MDX provider so MDX authors can use them as JSX tags directly in content.
+- **MarkdownRenderer** (`src/components/markdown-renderer/`) — Wraps `MDXProvider`, maps HTML elements (h1–h4, ul, ol, a, p, etc.) to styled components. Add new MDX-injectable components here.
+- **Global context** (`src/contexts/GlobalContextProvider.tsx`) — App-wide state (dark/light theme toggle). Wrapped in both `gatsby-browser.js` and `gatsby-ssr.js`.
+- **Theme system** — `src/components/theme/colors.ts` defines light/dark color tokens; `src/components/theme/brand.ts` defines brand colors (primary, accent). Theme is injected via `ThemeProvider` from styled-components.
+- **TypeScript path alias** — `baseUrl: ./src/` in `tsconfig.json`. Pages and templates import from `components/...`, `hooks/...` etc. (absolute). Components import siblings with relative paths (`../heading/Heading`).
+
+### Import conventions
+
+- `src/pages/` and `src/templates/` — use absolute barrel imports: `import { Foo } from 'components/foo/Foo'`
+- `src/components/` — use relative imports for siblings: `import { Bar } from '../bar/Bar'`
+- Do not re-export internal styled components from `src/components/index.ts` — only export public-facing React components
 
 ### Styling
 
-Global styles live in `src/styles/` (CSS reset, base styles, Prism themes for light/dark mode). Component styles are co-located with components using styled-components.
+Component styles are co-located in a `styles.tsx` file next to each component. Global styles live in `src/styles/` and are composed in `GlobalStyle` (CSS reset, base styles, Prism themes, scrollbar, code titles).
+
+#### Styled-components utilities
+
+```ts
+import { mt, mb, p, mr } from 'styled-components-spacing'; // spacing scale 0–12
+import breakpoint from 'styled-components-breakpoint';      // responsive helpers
+
+const Card = styled.div`
+  ${p(5)};                              // padding: 1.5rem
+  ${breakpoint('xs', 'lg')`            // applies between xs and lg
+    ${p(4)};
+  `}
+`;
+```
+
+#### Accessing theme tokens
+
+```ts
+const El = styled.div`
+  color: ${({ theme }) => theme.colors.primaryText};
+  font-size: ${({ theme }) => theme.fontSizes.medium};
+  font-family: ${({ theme }) => theme.fonts.body};
+  border-radius: ${({ theme }) => theme.borderRadius.base};
+  font-weight: ${({ theme }) => theme.fontWeights[5]};  // 500
+`;
+```
+
+## Design system
+
+### Breakpoints
+
+| Name | px | Viewport |
+|------|----|---------|
+| `xs` | 0 | mobile |
+| `xsm` | 370 | small mobile |
+| `sm` | 480 | |
+| `md` | 640 | tablet |
+| `lg` | 800 | |
+| `xl` | 992 | desktop |
+| `xxl` | 1120 | |
+| `xxxl` | 1200 | large desktop |
+
+### Spacing scale
+
+`styled-components-spacing` utilities (`mt`, `mb`, `p`, `mr`, etc.) take a scale key 0–12:
+
+| Key | Value |
+|-----|-------|
+| 0 | 0 |
+| 1 | 0.25rem |
+| 2 | 0.5rem |
+| 3 | 0.75rem |
+| 4 | 1rem |
+| 5 | 1.5rem |
+| 6 | 2rem |
+| 7 | 2.5rem |
+| 8 | 3rem |
+| 9 | 4rem |
+| 10 | 5rem |
+
+### Typography
+
+**Fonts** (`theme.fonts`):
+| Key | Family |
+|-----|--------|
+| `body` | Source Sans Pro, system fallbacks |
+| `primaryHeading` | Domine (serif) |
+| `secondaryHeading` | Roboto |
+
+**Font sizes** (`theme.fontSizes`):
+| Key | Value |
+|-----|-------|
+| `xsmall` | 0.975rem |
+| `small` | 1.05rem |
+| `xmedium` | 1.125rem |
+| `medium` | 1.2rem |
+| `large` | 1.3rem |
+| `xlarge` | 1.4rem |
+
+**Heading sizes** (`theme.headingFontSizes`): `small` 1.2rem → `medium` 1.5rem → `large` 1.8rem → `xlarge` 2.1rem
+
+**Font weights** (`theme.fontWeights[n]`): index 0–9 maps to 0, 100, 200 … 900 — e.g. `fontWeights[4]` = 400, `fontWeights[7]` = 700
+
+**Line heights** (`theme.lineHeights`): `regular` 1.8 · `condensed` 1.5 · `extraCondensed` 1.4
+
+### Theming (light / dark)
+
+Source of truth is `src/components/theme/brand.ts` — edit brand values there to shift the whole theme:
+
+```ts
+// light
+lightBrand = { base: '#81A6C6', accent: '#3B6E9A', heroText: '#0f2035', heroParagraph: '#2a4a68' }
+// dark
+darkBrand  = { base: '#1f1f1f', accent: '#81A6C6', heroText: '#e7e7e7', heroParagraph: '#C8C8C8' }
+```
+
+Color tokens (`theme.colors`) derived from brand values:
+
+| Token | Purpose |
+|-------|---------|
+| `primaryBackground` | Page background |
+| `secondaryBackground` | Section / card background |
+| `tertiaryBackground` | Code title bar, subtle fills |
+| `quaternaryBackground` | Hover states |
+| `primaryText` | Body text |
+| `brandPrimary` | Links, accents, primary CTA — equals `accent` |
+| `heroBackground` | Header / hero area background |
+| `heroText` / `heroParagraph` | Text rendered on brand background |
+| `cardBorder` | Card / code block borders |
+| `codeHighlightBackground` | Highlighted line fill |
+| `codeHighlightBorderColor` | Highlighted line left-border accent |
+
+Theme is toggled via `useThemeToggle` hook → `GlobalContextProvider` → `GlobalStateContext`. Default is `lightTheme`. Wrapped in `gatsby-browser.js` and `gatsby-ssr.js` so it applies to all pages including SSR.
+
+### Code syntax highlighting
+
+Two Prism themes co-located in `src/styles/`:
+- **Dark:** Laserwave — colourful on dark background
+- **Light:** One Light (Atom) — subtle on white background
+
+Theme is applied conditionally in `CodeBlockStyles.tsx`:
+```ts
+${({ theme }) => theme.name === 'lightTheme' ? PrismOneLightTheme : PrismDarkTheme}
+```
+
+Highlighted lines use `theme.colors.codeHighlightBackground` + `codeHighlightBorderColor` for the left accent border.
+
+## Deployment
+
+- **Host:** Netlify
+- **Branch deploys:** Every PR to `master` gets a Netlify preview URL; CI runs Playwright against it
+- **Production:** Merges to `master` auto-deploy to `https://ajeetchaulagain.com`
+
+## Package upgrade constraints
+
+These packages must **not** be upgraded to the next major version without careful testing:
+
+| Package | Current | Reason to hold |
+|---------|---------|----------------|
+| `styled-components` | 5 | v6 may change CSS output and break visual regression baselines |
+| `react` / `react-dom` | 18 | React 19 has breaking changes; Gatsby 5 compatibility unverified |
+| `@mdx-js/react` | 2 | v3 breaks MDXProvider API used in MarkdownRenderer |
+| `react-icons` | 4 | v5 restructured FA packages; some icons renamed/moved |
+| `prism-react-renderer` | 1 | v2 has breaking API changes; used for code block rendering |
+| `eslint` | 7 | v9 requires flat config migration |
+| `@fontsource/*` | 4 | v5 changes font metrics causing pixel-level visual regression failures |
 
 ## yarn resolutions
 
-The `resolutions` field in `package.json` pins specific transitive dependency versions. Do not remove these without understanding why they were added:
+The `resolutions` field in `package.json` pins transitive dependency versions. Do not remove without understanding why:
 
 | Package | Reason |
 |---------|--------|
-| `@types/react` | `@reach/router` (used internally by Gatsby) bundles its own older `@types/react`, causing duplicate React type conflicts. Pinned to force a single version. |
-| `webpack` | CVE-2025-68458 and CVE-2025-68157 (SSRF, LOW) introduced via `gatsby@5`. Fixed in `webpack@5.104.1`. |
-| `sharp` | Gatsby image plugins (gatsby-plugin-sharp, gatsby-transformer-sharp, gatsby-plugin-manifest, gatsby-sharp) each install their own nested copy of `sharp`, causing libvips integrity check failures on Netlify's Linux CI environment. Pinned to force a single hoisted installation. |
+| `@types/react` | `@reach/router` (Gatsby internal) ships its own older `@types/react`, causing duplicate type conflicts. Pinned to force a single version. |
+| `webpack` | CVE-2025-68458 and CVE-2025-68157 (SSRF) via `gatsby@5`. Fixed in `webpack@5.104.1`. |
+| `sharp` | Gatsby image plugins each install their own nested `sharp`, causing libvips integrity failures on Netlify CI. Pinned to force a single hoisted copy. |
 
 ## Code style
 
-- ESLint with Airbnb config + TypeScript; Prettier with single quotes, 2-space indent, 80-char line width, trailing commas (es5)
-- Strict TypeScript — no unused locals/parameters
+- ESLint with Airbnb config + TypeScript; Prettier: single quotes, 2-space indent, 80-char line width, trailing commas (es5)
+- Strict TypeScript — no unused locals/parameters (`strict: true` in tsconfig)
+- No default exports — use named exports throughout
diff --git a/playwright.config.ts b/playwright.config.ts
index 85811027..c8275417 100644
--- a/playwright.config.ts
+++ b/playwright.config.ts
@@ -37,13 +37,13 @@ export default defineConfig({
     trace: 'on-first-retry',
   },
 
-  // Single template for all assertions
-  snapshotPathTemplate:
-    '{testDir}/__screenshots__/{projectName}/{testFilePath}/{arg}{ext}',
+  // Platform-aware snapshot paths: darwin/ for macOS, linux/ for CI
+  // This prevents cross-platform font rendering differences from breaking tests
+  snapshotPathTemplate: `{testDir}/__screenshots__/${process.platform}/{projectName}/{testFilePath}/{arg}{ext}`,
 
   expect: {
     toHaveScreenshot: {
-      maxDiffPixelRatio: 0.01, // Allow 1% pixels diff ratio
+      maxDiffPixelRatio: 0.02, // Allow 2% pixels diff ratio
     },
   },
 
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