feat: add custom CodeMirror theme with purple accent colors

Replace oneDark theme with custom crispyEditorTheme featuring:
- Purple accent (#c9a6eb) for keywords and HTML tags
- Matching dark background (#262630)
- Applied consistently across editor and reference code blocks

🤖 Generated with [Claude Code](https://claude.com/claude-code)

src/app.js

@@ -1,5 +1,5 @@
 import { LessonEngine } from "./impl/LessonEngine.js";
-import { CodeEditor } from "./impl/CodeEditor.js";
+import { CodeEditor, crispyEditorTheme } from "./impl/CodeEditor.js";
 import { renderLesson, renderModuleList, renderLevelIndicator, updateActiveLessonInSidebar } from "./helpers/renderer.js";
 import { loadModules } from "./config/lessons.js";
 import { initI18n, t, getLanguage, setLanguage, applyTranslations } from "./i18n.js";
@@ -10,7 +10,6 @@ import { getRandomTemplate } from "./config/playground-templates.js";
 // CodeMirror imports for syntax highlighting
 import { EditorState } from "@codemirror/state";
 import { EditorView } from "@codemirror/view";
-import { oneDark } from "@codemirror/theme-one-dark";
 import { html } from "@codemirror/lang-html";
 import { css } from "@codemirror/lang-css";
 
@@ -79,7 +78,7 @@ function highlightSectionCodeBlocks() {
 		// Create read-only CodeMirror view
 		const state = EditorState.create({
 			doc: content,
-			extensions: [langExtension, oneDark, readOnlyTheme, EditorState.readOnly.of(true), EditorView.lineWrapping]
+			extensions: [langExtension, crispyEditorTheme, readOnlyTheme, EditorState.readOnly.of(true), EditorView.lineWrapping]
 		});
 
 		const view = new EditorView({
@@ -2153,7 +2152,7 @@ function highlightReferenceCodeBlocks() {
 		const view = new EditorView({
 			state: EditorState.create({
 				doc: code,
-				extensions: [isHtml ? html() : css(), oneDark, readOnlyTheme, EditorState.readOnly.of(true), EditorView.editable.of(false)]
+				extensions: [isHtml ? html() : css(), crispyEditorTheme, readOnlyTheme, EditorState.readOnly.of(true), EditorView.editable.of(false)]
 			}),
 			parent
 		});

src/i18n.js

@@ -253,7 +253,7 @@ const translations = {
 
 		// Landing page
 		landingHeroTitle: "Web Programmierung",
-		landingHeroHighlight: "Selbstständig Coden lernen",
+		landingHeroHighlight: "Selbstständig lernen",
 		landingHeroSubtitle: "Meistere HTML, CSS und Tailwind durch praktische Übungen mit sofortigem Feedback. Kostenlos und Open Source.",
 		landingCtaStart: "Jetzt starten",
 		landingWhyTitle: "Warum Code Crispies funktioniert",

src/impl/CodeEditor.js

@@ -5,13 +5,88 @@ import { EditorState, Prec } from "@codemirror/state";
 import { EditorView, keymap, placeholder } from "@codemirror/view";
 import { defaultKeymap, historyKeymap, indentMore, indentLess, undo, redo } from "@codemirror/commands";
 import { history } from "@codemirror/commands";
-import { oneDark } from "@codemirror/theme-one-dark";
 import { html } from "@codemirror/lang-html";
 import { css } from "@codemirror/lang-css";
 import { autocompletion } from "@codemirror/autocomplete";
 import { abbreviationTracker, expandAbbreviation } from "@emmetio/codemirror6-plugin";
+import { HighlightStyle, syntaxHighlighting } from "@codemirror/language";
+import { tags } from "@lezer/highlight";
 
-// Custom overrides for One Dark theme
+// Custom theme with purple accent colors (matching app completed state)
+const crispyTheme = EditorView.theme(
+	{
+		"&": {
+			backgroundColor: "#262630",
+			color: "#c8c8d0"
+		},
+		".cm-content": {
+			caretColor: "#9b6dd4"
+		},
+		".cm-cursor, .cm-dropCursor": {
+			borderLeftColor: "#9b6dd4"
+		},
+		"&.cm-focused > .cm-scroller > .cm-selectionLayer .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection": {
+			backgroundColor: "#3e3e4a"
+		},
+		".cm-panels": {
+			backgroundColor: "#262630",
+			color: "#c8c8d0"
+		},
+		".cm-searchMatch": {
+			backgroundColor: "#3e3e4a",
+			outline: "1px solid #9b6dd4"
+		},
+		".cm-searchMatch.cm-searchMatch-selected": {
+			backgroundColor: "rgba(155, 109, 212, 0.3)"
+		},
+		".cm-activeLine": {
+			backgroundColor: "#2e2e3a"
+		},
+		".cm-selectionMatch": {
+			backgroundColor: "#3e3e4a"
+		},
+		".cm-gutters": {
+			backgroundColor: "#262630",
+			color: "#808090",
+			border: "none"
+		},
+		".cm-activeLineGutter": {
+			backgroundColor: "#2e2e3a"
+		},
+		".cm-lineNumbers .cm-gutterElement": {
+			color: "#808090"
+		}
+	},
+	{ dark: true }
+);
+
+// Syntax highlighting with purple accent
+const crispyHighlight = HighlightStyle.define([
+	{ tag: tags.keyword, color: "#c9a6eb" },
+	{ tag: tags.operator, color: "#cdd6f4" },
+	{ tag: tags.variableName, color: "#89b4fa" },
+	{ tag: tags.propertyName, color: "#89b4fa" },
+	{ tag: tags.attributeName, color: "#89b4fa" },
+	{ tag: tags.className, color: "#89b4fa" },
+	{ tag: tags.tagName, color: "#c9a6eb" },
+	{ tag: tags.string, color: "#a6e3a1" },
+	{ tag: tags.number, color: "#fab387" },
+	{ tag: tags.bool, color: "#fab387" },
+	{ tag: tags.null, color: "#fab387" },
+	{ tag: tags.comment, color: "#6c7086", fontStyle: "italic" },
+	{ tag: tags.bracket, color: "#cdd6f4" },
+	{ tag: tags.punctuation, color: "#cdd6f4" },
+	{ tag: tags.definition(tags.variableName), color: "#89b4fa" },
+	{ tag: tags.function(tags.variableName), color: "#89b4fa" },
+	{ tag: tags.atom, color: "#c9a6eb" },
+	{ tag: tags.unit, color: "#a6e3a1" },
+	{ tag: tags.color, color: "#f9e2af" }
+]);
+
+// Combined theme export
+export const crispyEditorTheme = [crispyTheme, syntaxHighlighting(crispyHighlight)];
+
+// Custom overrides for editor styling
 const editorTheme = EditorView.theme(
 	{
 		"&": {
@@ -51,7 +126,7 @@ export class CodeEditor {
 		// Build extensions array
 		const extensions = [
 			langExtension,
-			oneDark,
+			crispyEditorTheme,
 			editorTheme,
 			// History for undo/redo
 			history(),