Add React + Vite port of the logo generator

Full React port sharing src/logo.js core (shadow geometry, CSS
output, defaults, font list). App.jsx holds the entire state in a
single useState object; controlled inputs drive the live render and
generated CSS. Keeps the accessibility markup (labels, aria,
<details>/<summary>, focus rings) from the html/vanilla versions;
reset restores defaults via the form's onReset.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

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+node_modules
+dist
+*.log
+.DS_Store

index.html

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+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Logo-Generator</title>
+  <link href="https://fonts.googleapis.com/css2?family=Anton&family=Bowlby+One&family=Bebas+Neue&family=Bungee&family=Passion+One:wght@900&family=Ultra&display=swap" rel="stylesheet">
+</head>
+<body>
+  <div id="root"></div>
+  <script type="module" src="/src/main.jsx"></script>
+</body>
+</html>

package.json

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+{
+  "name": "demo-ecmascript-react",
+  "version": "1.0.0",
+  "description": "LIBRETECH logo generator — React + Vite",
+  "repository": {
+    "type": "git",
+    "url": "ssh://tengo@git.librete.ch:41240/public/demo-ecmascript.git"
+  },
+  "license": "WTFPL",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-react": "^4.3.4",
+    "vite": "^6.0.0"
+  }
+}

src/App.jsx

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+import { useEffect, useState } from 'react';
+import { defaults, fonts, logoStyle, cssOutput } from './logo.js';
+
+const FONT_LABELS = { Impact: 'Impact (System)' };
+
+export default function App() {
+  const [s, setS] = useState(defaults);
+  const [copied, setCopied] = useState(false);
+
+  const set = (key) => (value) => setS((prev) => ({ ...prev, [key]: value }));
+  const num = (key) => (e) => set(key)(+e.target.value);
+  const str = (key) => (e) => set(key)(e.target.value);
+
+  useEffect(() => {
+    document.body.style.background = s.bg;
+  }, [s.bg]);
+
+  const css = cssOutput(s);
+
+  const copy = async () => {
+    try {
+      await navigator.clipboard.writeText(css);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
+    } catch {
+      alert('Kopieren fehlgeschlagen — bitte manuell aus dem Code-Feld kopieren.');
+    }
+  };
+
+  // Controlled inputs are not reset by the browser, so restore defaults here.
+  const reset = (e) => {
+    e.preventDefault();
+    setS(defaults);
+  };
+
+  return (
+    <>
+      <div className="logo" style={logoStyle(s)}>{s.text || ' '}</div>
+
+      <details className="disclosure" id="panel" open>
+        <summary className="toggle-panel">Panel ein/aus</summary>
+
+        <div className="panel">
+          <h1>Logo-Generator</h1>
+
+          <form id="logoForm" onSubmit={(e) => e.preventDefault()} onReset={reset}>
+            <h2>Inhalt</h2>
+            <p className="hint" id="hint-text">Mehrere Zeilen mit Enter trennen.</p>
+            <textarea
+              id="text"
+              rows={2}
+              aria-label="Logo-Text"
+              aria-describedby="hint-text"
+              value={s.text}
+              onChange={str('text')}
+            />
+
+            <h2>Schrift</h2>
+            <select id="font" aria-label="Schriftart" value={s.font} onChange={str('font')}>
+              {fonts.map((f) => (
+                <option key={f} value={f}>{FONT_LABELS[f] || f}</option>
+              ))}
+            </select>
+
+            <div className="row-2col">
+              <div>
+                <label htmlFor="fs">Größe: <span className="val">{s.fs}</span>vw</label>
+                <input type="range" id="fs" min="6" max="30" step="0.5" value={s.fs} onChange={num('fs')} />
+              </div>
+              <div>
+                <label htmlFor="lh">Zeilenabstand: <span className="val">{s.lh.toFixed(2)}</span></label>
+                <input type="range" id="lh" min="0.5" max="2" step="0.05" value={s.lh} onChange={num('lh')} />
+              </div>
+            </div>
+            <label htmlFor="ls">Buchstabenabstand: <span className="val">{s.ls.toFixed(3)}</span>em</label>
+            <input type="range" id="ls" min="-0.15" max="0.3" step="0.005" value={s.ls} onChange={num('ls')} />
+
+            <h2>Farben</h2>
+            <ColorRow id="bg" label="Hintergrund" value={s.bg} onChange={str('bg')} />
+            <ColorRow id="face" label="Face" value={s.face} onChange={str('face')} />
+            <ColorRow id="depth" label="Tiefe" value={s.depth} onChange={str('depth')} />
+            <ColorRow id="shadow" label="Schatten & Kontur" value={s.shadow} onChange={str('shadow')} />
+
+            <h2>Lichtrichtung</h2>
+            <p className="hint">Steuert alle Versätze gleichzeitig — Schatten geht in Lichtrichtung, Tiefe entgegen.</p>
+            <label htmlFor="angle">Winkel: <span className="val">{s.angle}</span>° (0=oben, 90=rechts, 180=unten)</label>
+            <input type="range" id="angle" min="0" max="359" value={s.angle} onChange={num('angle')} />
+
+            <h2>Schichten</h2>
+            <p className="hint">Hinten nach vorn: Schatten · Tiefe · Kontur · Face</p>
+            <label htmlFor="shadow-len">Schatten-Länge: <span className="val">{s.shadowLen}</span>px</label>
+            <input type="range" id="shadow-len" min="0" max="80" value={s.shadowLen} onChange={num('shadowLen')} />
+            <label htmlFor="depth-len">Tiefe (in Gegenrichtung): <span className="val">{s.depthLen}</span>px</label>
+            <input type="range" id="depth-len" min="0" max="30" value={s.depthLen} onChange={num('depthLen')} />
+            <label htmlFor="contour-len">Kontur (vor der Tiefe): <span className="val">{s.contourLen}</span>px</label>
+            <input type="range" id="contour-len" min="0" max="20" value={s.contourLen} onChange={num('contourLen')} />
+
+            <h2>Komposition</h2>
+            <div className="row-2col">
+              <div>
+                <label htmlFor="rot">Drehung: <span className="val">{s.rot}</span>°</label>
+                <input type="range" id="rot" min="-25" max="25" value={s.rot} onChange={num('rot')} />
+              </div>
+              <div>
+                <label htmlFor="skew">Schräge: <span className="val">{s.skew}</span>°</label>
+                <input type="range" id="skew" min="-20" max="20" value={s.skew} onChange={num('skew')} />
+              </div>
+            </div>
+
+            <h2>Generiertes CSS</h2>
+            <code id="cssout">{css}</code>
+            <button
+              type="button"
+              className={'copy-btn' + (copied ? ' copied' : '')}
+              onClick={copy}
+            >
+              {copied ? 'Kopiert!' : 'CSS kopieren'}
+            </button>
+            <button type="reset" className="reset-btn">Zurücksetzen</button>
+          </form>
+        </div>
+      </details>
+    </>
+  );
+}
+
+function ColorRow({ id, label, value, onChange }) {
+  return (
+    <div className="color-row">
+      <input type="color" id={`c-${id}`} value={value} onChange={onChange} aria-labelledby={`lbl-${id}`} />
+      <span className="swatch-label" id={`lbl-${id}`}>{label}</span>
+      <span className="hex">{value}</span>
+    </div>
+  );
+}

src/logo.js

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+// Framework-agnostic core for the logo generator.
+// State shape (see `defaults`) is shared by every port.
+
+export const defaults = {
+  text: 'LIBRE\nTECH',
+  font: 'Anton',
+  fs: 18,
+  lh: 1.05,
+  ls: 0.01,
+  bg: '#362582',
+  face: '#f6d939',
+  depth: '#ea741e',
+  shadow: '#221953',
+  angle: 133,
+  shadowLen: 30,
+  depthLen: 15,
+  contourLen: 11,
+  rot: -10,
+  skew: -8,
+};
+
+export const fonts = [
+  'Anton',
+  'Bowlby One',
+  'Bebas Neue',
+  'Bungee',
+  'Passion One',
+  'Ultra',
+  'Impact',
+];
+
+const round = (n) => Math.round(n * 100) / 100;
+
+// Layered text-shadow offsets. `depthColor`/`shadowColor` are substituted
+// so the same geometry serves both the live render (literal hex) and the
+// generated snippet (CSS var()).
+export function shadowLayers(s, depthColor, shadowColor) {
+  const rad = (s.angle * Math.PI) / 180;
+  const dx = Math.sin(rad);
+  const dy = -Math.cos(rad);
+  const parts = [];
+  // Kontur (front): steps along the light direction, shadow colour.
+  for (let i = 1; i <= s.contourLen; i++) {
+    parts.push(`${round(dx * i)}px ${round(dy * i)}px 0 ${shadowColor}`);
+  }
+  // Tiefe (middle): opposite direction.
+  for (let i = 1; i <= s.depthLen; i++) {
+    parts.push(`${round(-dx * i)}px ${round(-dy * i)}px 0 ${depthColor}`);
+  }
+  // Schatten (back): long, same direction as Kontur; continue past
+  // contourLen so steps do not overlap.
+  for (let i = s.contourLen + 1; i <= s.contourLen + s.shadowLen; i++) {
+    parts.push(`${round(dx * i)}px ${round(dy * i)}px 0 ${shadowColor}`);
+  }
+  return parts;
+}
+
+export function inlineTextShadow(s) {
+  const parts = shadowLayers(s, s.depth, s.shadow);
+  return parts.length ? parts.join(', ') : 'none';
+}
+
+export function logoStyle(s) {
+  return {
+    fontFamily: `'${s.font}', 'Bebas Neue', Impact, sans-serif`,
+    fontSize: `${s.fs}vw`,
+    lineHeight: String(s.lh),
+    letterSpacing: `${s.ls}em`,
+    color: s.face,
+    transform: `rotate(${s.rot}deg) skewX(${s.skew}deg)`,
+    textShadow: inlineTextShadow(s),
+  };
+}
+
+export function cssOutput(s) {
+  const lines = shadowLayers(s, 'var(--depth)', 'var(--shadow)').map((l) => '    ' + l);
+  return `:root {
+  --bg:     ${s.bg};
+  --face:   ${s.face};
+  --depth:  ${s.depth};
+  --shadow: ${s.shadow};
+}
+
+body {
+  background: var(--bg);
+}
+
+.logo {
+  font-family: '${s.font}', sans-serif;
+  font-size: ${s.fs}vw;
+  line-height: ${s.lh};
+  letter-spacing: ${s.ls}em;
+  color: var(--face);
+  transform: rotate(${s.rot}deg) skewX(${s.skew}deg);
+  white-space: pre-line;
+  text-shadow:
+${lines.join(',\n')};
+}`;
+}

src/main.jsx

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+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import App from './App.jsx';
+import './style.css';
+
+createRoot(document.getElementById('root')).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);

src/style.css

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+* { box-sizing: border-box; }
+html, body { height: 100%; margin: 0; }
+body {
+  background: #362582;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-family: 'Anton', 'Bebas Neue', Impact, sans-serif;
+  overflow: hidden;
+  transition: background 0.15s;
+}
+#root { display: contents; }
+.logo {
+  font-size: 18vw;
+  font-weight: 400;
+  color: #f6d939;
+  line-height: 1.05;
+  letter-spacing: 0.01em;
+  transform: rotate(-10deg) skewX(-8deg);
+  transform-origin: center;
+  text-align: center;
+  user-select: none;
+  transition: color 0.15s;
+  white-space: pre-line;
+}
+
+.panel {
+  position: fixed;
+  top: 12px;
+  right: 12px;
+  background: rgba(0,0,0,0.72);
+  color: #eee;
+  padding: 14px 18px;
+  border-radius: 10px;
+  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
+  font-size: 12px;
+  width: 320px;
+  backdrop-filter: blur(10px);
+  max-height: 96vh;
+  overflow-y: auto;
+  box-shadow: 0 6px 30px rgba(0,0,0,0.4);
+}
+.panel h1 { margin: 0 0 10px; font-size: 14px; color: #fff; }
+.panel h2 {
+  margin: 14px 0 6px;
+  font-size: 11px;
+  color: #f6d939;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  border-bottom: 1px solid rgba(255,255,255,0.1);
+  padding-bottom: 4px;
+}
+.panel .hint {
+  font-size: 10px;
+  color: #aaa;
+  margin: 0 0 8px;
+  font-style: italic;
+}
+.panel label {
+  display: block;
+  margin: 6px 0 3px;
+  font-size: 11px;
+  color: #ccc;
+}
+.panel input[type=range] { width: 100%; margin: 0; }
+.panel input[type=text],
+.panel textarea,
+.panel select {
+  width: 100%;
+  padding: 5px 8px;
+  background: rgba(255,255,255,0.08);
+  color: white;
+  border: 1px solid rgba(255,255,255,0.2);
+  border-radius: 4px;
+  font-family: inherit;
+  font-size: 12px;
+}
+.panel textarea {
+  resize: vertical;
+  min-height: 60px;
+}
+.panel input:focus, .panel textarea:focus, .panel select:focus {
+  outline: 2px solid #f6d939;
+  outline-offset: 1px;
+  border-color: rgba(246,217,57,0.6);
+}
+.toggle-panel:focus-visible,
+.copy-btn:focus-visible,
+.reset-btn:focus-visible {
+  outline: 2px solid #f6d939;
+  outline-offset: 2px;
+}
+.color-row {
+  display: grid;
+  grid-template-columns: auto 1fr auto;
+  gap: 8px;
+  align-items: center;
+  margin: 4px 0;
+}
+.color-row input[type=color] {
+  width: 36px;
+  height: 28px;
+  border: 1px solid rgba(255,255,255,0.2);
+  border-radius: 4px;
+  background: transparent;
+  cursor: pointer;
+  padding: 2px;
+}
+.color-row .swatch-label { font-size: 11px; color: #ccc; }
+.color-row .hex { font-size: 10px; color: #aaa; text-align: right; width: 60px; }
+.val { color: #f6d939; font-weight: bold; }
+.row-2col {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 8px;
+}
+.panel code {
+  display: block;
+  background: rgba(0,0,0,0.5);
+  padding: 8px;
+  margin-top: 10px;
+  border-radius: 4px;
+  font-size: 10px;
+  max-height: 220px;
+  overflow-y: auto;
+  white-space: pre;
+  color: #aaa;
+  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
+}
+.copy-btn, .reset-btn {
+  width: 100%;
+  padding: 6px;
+  margin-top: 6px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 11px;
+}
+.copy-btn {
+  background: rgba(246,217,57,0.15);
+  color: #f6d939;
+  border: 1px solid rgba(246,217,57,0.4);
+}
+.copy-btn:hover { background: rgba(246,217,57,0.25); }
+.copy-btn.copied { background: rgba(120,200,120,0.25); color: #cfc; border-color: rgba(120,200,120,0.5); }
+.reset-btn {
+  background: rgba(255,255,255,0.05);
+  color: #ccc;
+  border: 1px solid rgba(255,255,255,0.15);
+}
+.reset-btn:hover { background: rgba(255,255,255,0.1); }
+
+.toggle-panel {
+  position: fixed;
+  top: 12px;
+  left: 12px;
+  background: rgba(0,0,0,0.6);
+  color: white;
+  border: 1px solid rgba(255,255,255,0.2);
+  padding: 6px 10px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-family: inherit;
+  font-size: 11px;
+  z-index: 10;
+}
+summary.toggle-panel { list-style: none; }
+summary.toggle-panel::-webkit-details-marker { display: none; }
+.disclosure { position: static; }

vite.config.js

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+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+export default defineConfig({
+  plugins: [react()],
+});