diff --git a/src/main.js b/src/main.js
index d16c5f6..4c74c47 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,29 +1,18 @@
-import { startCamera, grabFrame } from './camera.js';
-import { decodeBarcodes } from './barcode.js';
+import { renderScanView } from './ui/scan-view.js';
+import { showResult } from './ui/result-overlay.js';
+import { startCamera } from './camera.js';
 
 const app = document.querySelector('#app');
-app.innerHTML = `
-  <video id="v" style="width:100%"></video>
-  <button id="b" style="min-height:56px;width:100%">Bild aufnehmen</button>
-  <pre id="out"></pre>
-`;
-
-const video = document.querySelector('#v');
-const out = document.querySelector('#out');
-
-startCamera(video)
-  .then(() => { out.textContent = 'Kamera laeuft'; })
-  .catch((error) => { out.textContent = `Kamera nicht verfuegbar: ${error.message}`; });
-
-document.querySelector('#b').addEventListener('click', async () => {
-  try {
-    // grabFrame wirft, wenn das Kamerabild noch nicht bereit ist (siehe
-    // camera.js) - dieser Fall wird hier abgefangen und sichtbar gemacht,
-    // statt unbehandelt zu verpuffen.
-    const frame = grabFrame(video);
-    const codes = await decodeBarcodes(frame);
-    out.textContent = codes.length ? codes.join('\n') : 'kein Barcode gefunden';
-  } catch (error) {
-    out.textContent = `Fehler: ${error.message}`;
-  }
+const view = renderScanView(app, {
+  onCapture: () =>
+    showResult(app, {
+      stackId: 'B',
+      spec: { capacityGb: 64, rank: '4DRx4', speed: 'PC4-2400', formFactor: 'LRDIMM', partNumber: 'M386A8K40BM1-CRC4Y' },
+      confidence: 'green',
+    }),
+  onUndo: () => view.setLast('zurueckgenommen'),
+  onOpenList: () => {},
+  onPickFile: () => {},
 });
+view.setStacks([{ id: 'A', count: 12 }, { id: 'B', count: 4 }]);
+startCamera(view.video).catch(() => view.setStatus('Kamera nicht verfuegbar', true));
diff --git a/src/styles.css b/src/styles.css
index f7bb793..5807a9d 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -1,2 +1,110 @@
-:root { color-scheme: dark; }
-body { margin: 0; font-family: system-ui, sans-serif; }
+:root {
+  color-scheme: dark;
+  --bg: #14161a;
+  --fg: #f2f4f7;
+  --muted: #9aa3af;
+  --green: #1f8a4c;
+  --yellow: #b8860b;
+  --red: #a02c2c;
+  --line: #2a2e36;
+}
+
+* { box-sizing: border-box; }
+
+body {
+  margin: 0;
+  background: var(--bg);
+  color: var(--fg);
+  font-family: system-ui, -apple-system, sans-serif;
+  overscroll-behavior: none;
+}
+
+#app { display: flex; flex-direction: column; height: 100dvh; }
+
+.camera { position: relative; flex: 1; overflow: hidden; background: #000; }
+.camera video { width: 100%; height: 100%; object-fit: cover; }
+
+.frame {
+  position: absolute;
+  inset: 20% 8%;
+  border: 3px solid rgba(255, 255, 255, 0.7);
+  border-radius: 8px;
+  pointer-events: none;
+}
+
+.stacks {
+  display: flex;
+  gap: 8px;
+  padding: 10px 12px;
+  overflow-x: auto;
+  border-top: 1px solid var(--line);
+  min-height: 56px;
+  align-items: center;
+}
+
+.stacks button {
+  flex: none;
+  min-height: 44px;
+  padding: 0 14px;
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  background: #1c2027;
+  color: var(--fg);
+  font-size: 17px;
+  font-weight: 600;
+}
+
+.last {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 10px 12px;
+  border-top: 1px solid var(--line);
+  min-height: 56px;
+  font-size: 15px;
+  color: var(--muted);
+}
+
+.last span { flex: 1; }
+
+.action {
+  min-height: 56px;
+  border: none;
+  border-radius: 10px;
+  background: #2b6cb0;
+  color: #fff;
+  font-size: 18px;
+  font-weight: 600;
+  padding: 0 18px;
+}
+
+.action.secondary { background: #2a2e36; }
+
+.capture { margin: 12px; }
+
+.overlay {
+  position: fixed;
+  inset: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 18px;
+  padding: 24px;
+  text-align: center;
+  z-index: 10;
+}
+
+.overlay.green { background: var(--green); }
+.overlay.yellow { background: var(--yellow); }
+.overlay.red { background: var(--red); }
+
+.overlay .stack-id { font-size: 68px; font-weight: 800; letter-spacing: 2px; }
+.overlay .detail { font-size: 20px; line-height: 1.5; }
+.overlay .pn { font-size: 15px; opacity: 0.85; word-break: break-all; }
+
+.choices { display: grid; gap: 12px; width: 100%; max-width: 420px; }
+.choices button { min-height: 64px; font-size: 20px; }
+
+.status { padding: 8px 12px; font-size: 14px; color: var(--muted); }
+.status.warn { color: #f0b429; }
diff --git a/src/ui/result-overlay.js b/src/ui/result-overlay.js
new file mode 100644
index 0000000..a58d167
--- /dev/null
+++ b/src/ui/result-overlay.js
@@ -0,0 +1,33 @@
+function beschreibung(spec) {
+  const teile = [
+    spec.capacityGb ? `${spec.capacityGb}GB` : null,
+    spec.rank,
+    spec.speed,
+    spec.formFactor,
+  ].filter(Boolean);
+  return teile.join(' ') || 'ohne Angaben';
+}
+
+/**
+ * Blendet die Treffer-Rueckmeldung ein und nach kurzer Zeit wieder aus.
+ * Gruen bei Barcode, gelb bei OCR. Keine Eingabe noetig.
+ */
+export function showResult(root, { stackId, spec, confidence }, dauerMs = 1200) {
+  const overlay = document.createElement('div');
+  overlay.className = `overlay ${confidence}`;
+  overlay.innerHTML = `
+    <div class="stack-id">STAPEL ${stackId}</div>
+    <div class="detail"></div>
+    <div class="pn"></div>
+  `;
+  overlay.querySelector('.detail').textContent = beschreibung(spec);
+  overlay.querySelector('.pn').textContent = spec.partNumber ?? '';
+  root.appendChild(overlay);
+
+  return new Promise((resolve) => {
+    setTimeout(() => {
+      overlay.remove();
+      resolve();
+    }, dauerMs);
+  });
+}
diff --git a/src/ui/scan-view.js b/src/ui/scan-view.js
new file mode 100644
index 0000000..5cb229f
--- /dev/null
+++ b/src/ui/scan-view.js
@@ -0,0 +1,66 @@
+/**
+ * Baut die Hauptansicht auf und liefert Aktualisierungsfunktionen zurueck.
+ * Kennt weder Kamera noch Erkennung - alles kommt ueber die Rueckrufe.
+ */
+export function renderScanView(root, { onCapture, onUndo, onOpenList, onPickFile }) {
+  root.innerHTML = `
+    <div class="camera">
+      <video id="preview" playsinline muted></video>
+      <div class="frame"></div>
+    </div>
+    <div class="status" id="status"></div>
+    <button class="action capture" id="capture">Modul scannen</button>
+    <div class="stacks" id="stacks"></div>
+    <div class="last">
+      <span id="last">Noch nichts erfasst</span>
+      <button class="action secondary" id="undo" style="min-width:64px">&#8630;</button>
+    </div>
+    <input type="file" id="file" accept="image/*" hidden />
+  `;
+
+  const stacksEl = root.querySelector('#stacks');
+  const lastEl = root.querySelector('#last');
+  const statusEl = root.querySelector('#status');
+  const fileEl = root.querySelector('#file');
+
+  root.querySelector('#capture').addEventListener('click', onCapture);
+  root.querySelector('#undo').addEventListener('click', onUndo);
+  fileEl.addEventListener('change', () => {
+    if (fileEl.files[0]) onPickFile(fileEl.files[0]);
+    fileEl.value = '';
+  });
+
+  return {
+    video: root.querySelector('#preview'),
+
+    /** @param {{id: string, count: number}[]} stacks */
+    setStacks(stacks) {
+      stacksEl.innerHTML = '';
+      if (stacks.length === 0) {
+        stacksEl.textContent = 'Noch keine Stapel';
+        return;
+      }
+      for (const stack of stacks) {
+        const button = document.createElement('button');
+        button.textContent = `${stack.id}: ${stack.count}`;
+        button.addEventListener('click', onOpenList);
+        stacksEl.appendChild(button);
+      }
+    },
+
+    setLast(text) {
+      lastEl.textContent = text;
+    },
+
+    /** @param {string} text @param {boolean} warn */
+    setStatus(text, warn = false) {
+      statusEl.textContent = text;
+      statusEl.classList.toggle('warn', warn);
+    },
+
+    openFilePicker() {
+      fileEl.hidden = false;
+      fileEl.click();
+    },
+  };
+}