ember-learn
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@@ -1,5 +1,4 @@
 # compiled output
-/dist/
 /tmp/
 
 # misc
@@ -20,6 +19,8 @@
 /CONTRIBUTING.md
 /ember-cli-build.js
 /eslint.config.mjs
+/rollup.config.mjs
+/postcss.config.cjs
 /testem.js
 /tests/
 /tsconfig.declarations.json
 
@@ -9,9 +9,28 @@ This addon is intended to provide basic components for easier style coordination
 
 ## Compatibility
 
-* Ember.js v3.24 or above
-* Ember CLI v3.24 or above
-* Node.js v18 or above
+* Ember.js v4.12 or above
+* Node.js v20 or above
+
+## Installation
+
+```bash
+pnpm add ember-styleguide
+```
+
+## Usage
+
+### CSS
+
+Import the addon's styles in your app's CSS (e.g., `app/styles/app.css`):
+
+```css
+@import 'ember-styleguide/styles.css';
+```
+
+### Components
+
+The addon provides components like `<EsHeader>`, `<EsFooter>`, `<EsCard>`, `<EsNote>`, etc. See the demo app for usage examples.
 
 ## Contributing
 
 
@@ -0,0 +1,5 @@
+'use strict';
+
+const { addonV1Shim } = require('@embroider/addon-shim');
+
+module.exports = addonV1Shim(__dirname);
@@ -0,0 +1,32 @@
+import EmberApp from 'ember-strict-application-resolver';
+import EmberRouter from '@ember/routing/router';
+import { properLinks } from 'ember-primitives/proper-links';
+import { addRoutes } from 'kolay';
+import PageTitleService from 'ember-page-title/services/page-title';
+import legacyInspectorSupport from '@embroider/legacy-inspector-support/ember-source-4.12';
+
+// Addon services (resolved via vite alias to ./dist/)
+import NavbarService from '#src/services/navbar';
+import ProgressService from '#src/services/progress';
+
+@properLinks
+class Router extends EmberRouter {
+  location = 'history';
+  rootURL = '/';
+}
+
+export class App extends EmberApp {
+  inspector = legacyInspectorSupport(this);
+  modules = {
+    './router': Router,
+    './services/page-title': PageTitleService,
+    './services/navbar': NavbarService,
+    './services/progress': ProgressService,
+    ...import.meta.glob('./templates/**/*.{gts,gjs,hbs}', { eager: true }),
+    ...import.meta.glob('./routes/**/*', { eager: true }),
+  };
+}
+
+Router.map(function () {
+  addRoutes(this);
+});
@@ -0,0 +1,118 @@
+import Component from '@glimmer/component';
+
+function luminance(hex) {
+  const r = parseInt(hex.slice(1, 3), 16) / 255;
+  const g = parseInt(hex.slice(3, 5), 16) / 255;
+  const b = parseInt(hex.slice(5, 7), 16) / 255;
+  const [rs, gs, bs] = [r, g, b].map((c) =>
+    c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4)
+  );
+  return 0.2126 * rs + 0.7152 * gs + 0.0722 * bs;
+}
+
+function contrastRatio(hex1, hex2) {
+  const l1 = luminance(hex1);
+  const l2 = luminance(hex2);
+  const lighter = Math.max(l1, l2);
+  const darker = Math.min(l1, l2);
+  return (lighter + 0.05) / (darker + 0.05);
+}
+
+function hexToRgb(hex) {
+  const r = parseInt(hex.slice(1, 3), 16);
+  const g = parseInt(hex.slice(3, 5), 16);
+  const b = parseInt(hex.slice(5, 7), 16);
+  return `${r}, ${g}, ${b}`;
+}
+
+function score(ratio, isLarge) {
+  const aaThreshold = isLarge ? 3 : 4.5;
+  const aaaThreshold = isLarge ? 4.5 : 7;
+  if (ratio >= aaaThreshold) return 'AAA✓';
+  if (ratio >= aaThreshold) return 'AA✓';
+  return 'FAIL';
+}
+
+// Default dark text color used by ember-styleguide
+// Match the actual ember-styleguide CSS: body color is --color-gray-700, .text-light is --color-gray-100
+const DARK_TEXT = '#42474F';
+const LIGHT_TEXT = '#F4F6F8';
+
+const SIZES = [
+  { cls: 'text-sm', large: false },
+  { cls: 'text-base', large: false },
+  { cls: 'text-md', large: false },
+  { cls: 'text-lg', large: true },
+  { cls: 'text-xl', large: true },
+];
+
+export default class ColorPallet extends Component {
+  get rgb() {
+    return hexToRgb(this.args.color);
+  }
+
+  get darkRow() {
+    const bg = this.args.color;
+    const ratio = contrastRatio(bg, DARK_TEXT);
+    return SIZES.map((s) => ({
+      cls: s.cls,
+      score: score(ratio, s.large),
+    }));
+  }
+
+  get lightRow() {
+    const bg = this.args.color;
+    const ratio = contrastRatio(bg, LIGHT_TEXT);
+    return SIZES.map((s) => ({
+      cls: s.cls,
+      score: score(ratio, s.large),
+    }));
+  }
+
+  <template>
+    <div class="field-guide-color-pallet" ...attributes>
+      <div class="color-pallet__example" style="background-color: {{@color}}">
+        <div class="color-pallet__example-text-row">
+          {{#each this.darkRow as |item|}}
+            <div class="color-pallet__example-text-result">
+              <span class="{{item.cls}} color-pallet__example-text">A</span>
+              <span class="score">{{item.score}}</span>
+            </div>
+          {{/each}}
+        </div>
+        <div class="color-pallet__example-text-row">
+          {{#each this.lightRow as |item|}}
+            <div class="color-pallet__example-text-result text-light">
+              <span class="{{item.cls}} color-pallet__example-text text-light">A</span>
+              <span class="score">{{item.score}}</span>
+            </div>
+          {{/each}}
+        </div>
+      </div>
+      <div class="color-pallet__details">
+        <dl>
+          <dt class="color-pallet__details-title">Name</dt>
+          <dd>{{@name}}</dd>
+        </dl>
+        <dl>
+          <dt class="color-pallet__details-title">Variable</dt>
+          <dd>{{@variable}}</dd>
+        </dl>
+        {{#if @className}}
+          <dl>
+            <dt class="color-pallet__details-title">Class Name</dt>
+            <dd>{{@className}}</dd>
+          </dl>
+        {{/if}}
+        <dl>
+          <dt class="color-pallet__details-title">RGB</dt>
+          <dd>{{this.rgb}}</dd>
+        </dl>
+        <dl>
+          <dt class="color-pallet__details-title">HEX</dt>
+          <dd>{{@color}}</dd>
+        </dl>
+      </div>
+    </div>
+  </template>
+}