Add initial rules and docs

.gitattributes

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+* text eol=lf

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 22
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - run: bun install
+      - run: bunx playwright install --with-deps chromium
+      - run: bun run check
+      - run: bun run test

.gitignore

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+# build output
+dist/
+
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# test output
+test-results/
+playwright-report/
+
+# macOS-specific files
+.DS_Store

CODE_OF_CONDUCT.md

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+# Code of conduct
+
+You should adhere to GitHub's [Acceptable Use](https://help.github.com/articles/github-terms-of-service/#c-acceptable-use) policy.
+
+You can use GitHub's [grievance process](https://github.com/contact/report-abuse) to report breaches of this policy.

CONTRIBUTING.md

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+# Contributing
+
+Thank you for wanting to contribute!
+
+Use [Bun](https://bun.sh):
+
+```sh
+bun install
+```
+
+## Commands
+
+| Command           | Description              |
+| ----------------- | ------------------------ |
+| `bun run dev`     | Start dev server         |
+| `bun run check`   | Linting and formatting   |
+| `bun run test`    | Playwright tests         |
+| `bun run preview` | Preview production build |
+| `bun run build`   | Production build         |

LICENSE

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+MIT License
+
+Copyright (c) 2026 - present Richard Hallows
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-# dotai
+# moderncss.ai
+
+Rules for modern CSS.
+
+The rules are a living document. If you've spotted a rule that's missing:
+
+- [Open an issue](https://github.com/moderncss/skills/issues)
+- [Contribute it](CONTRIBUTING.md)
+
+## [License](LICENSE)

astro.config.mjs

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+// @ts-check
+import { defineConfig } from "astro/config";
+
+// https://astro.build/config
+export default defineConfig({
+  markdown: {
+    shikiConfig: {
+      themes: {
+        light: "one-light",
+        dark: "github-dark-default",
+      },
+      defaultColor: "light-dark()",
+    },
+  },
+});

package.json

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+{
+  "name": "modern-css-skills",
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro",
+    "check": "bun run --sequential \"check:*\"",
+    "check:css": "stylelint \"src/**/*.css\" \"src/components/**/*.js\"",
+    "check:format": "oxfmt --check .",
+    "check:js": "oxlint",
+    "check:types": "astro check",
+    "format": "oxfmt --write .",
+    "test": "playwright test"
+  },
+  "dependencies": {
+    "astro": "6.0.4"
+  },
+  "devDependencies": {
+    "@astrojs/check": "0.9.7",
+    "@playwright/test": "^1.58.2",
+    "oxfmt": "^0.40.0",
+    "oxlint": "^1.55.0",
+    "postcss-lit": "^1.4.1",
+    "stylelint": "^17.4.0",
+    "stylelint-config-alphabetical-order": "^2.0.0",
+    "stylelint-config-standard": "^40.0.0"
+  }
+}

playwright.config.ts

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+import { defineConfig } from "@playwright/test";
+
+export default defineConfig({
+  testDir: ".",
+  testMatch: "**/*.spec.ts",
+  fullyParallel: true,
+  use: {
+    baseURL: "http://localhost:4321",
+  },
+  webServer: {
+    command: "bun run build && bun run preview",
+    url: "http://localhost:4321",
+    reuseExistingServer: true,
+  },
+  projects: [
+    {
+      name: "chromium",
+      use: { browserName: "chromium" },
+    },
+  ],
+});