diff --git a/docs/STATUS.md b/docs/STATUS.md
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+# Refactor-Status · `refactor/didaktik-rewrite-2026`
+
+Letzter Stand: 2026-05-14
+
+## Was steht
+
+### Foundation (Phasen 0–1)
+- [x] `CLAUDE.md` · `README.md` · `AGENTS.md` mit didaktischem Fundament (auf `main`)
+- [x] `docs/klausur-themen-2026.md` — 9 Klausur-Blöcke für 223015b gelockt (D1–D4 entschieden)
+- [x] `docs/223015b-lernziele.md` — 33 operative Lernziele im Fließsatz-Eichmaß
+- [x] `docs/223015b/01-…-bogen.md` bis `05-…-bogen.md` — 5 Kapitel-Skelette mit Folien-Plan, Streichungs-Liste, Demo-TODO
+
+### Demos (Phase 3)
+- [x] `kap02-eroeffner.png` — Lossless vs Lossy Wellenform-Vergleich (FLAC vs MP3 128)
+- [x] `kap03-eroeffner.png` — Drei Modalitäten Datei-Größen-Tabelle (Bild/Audio/Video)
+- [ ] **Kap 4 Eröffner** — Datei-Reise-Pfad (SSD → SATA → USB-C → HDMI → Display mit Datenraten)
+- [ ] **Kap 5 Eröffner** — Foto mit EXIF-Overlay (Privacy-Reveal)
+- [ ] Übrige ~40 unterstützende Demos pro Kapitel (siehe Visualisierungs-Listen in den Bogen-Docs)
+
+### Erste 5 Eröffner-Versuche (verworfen)
+Frühere Advance Organizer (`kap01-advance-organizer`, `kap02-bogen`, `kap03-modalitäten-bogen`, `kap04-bogen`, `kap05-bogen`) waren plump, gleichförmig und nicht erkenntnisgewinnend. Per Commit `1c8185b` gelöscht. Begründung: Topic-Boxen mit Pfeilen statt konkrete Daten in Transformation. Neue Strategie: pro Kapitel eigene Konkret-Komposition.
+
+### Slides selbst (Phase 4)
+- [ ] Komplett offen — die Bogen-Docs sind das Skelett, daraus werden in Phase 4 die Marp-Markdown-Files erzeugt
+- Reihenfolge laut Plan: 01-fundamentale → 02-kompression → 03-inhalte → 04-speicher → 05-distribution
+- Aktuelle Slide-Files (`01-grundlagen-text-audio.md` etc.) bleiben unangetastet bis die neuen Files stehen — kein „halb migriert"-Zustand
+- Make-Pattern erlaubt es, die alten Files weiterzulaufen während neue gebaut werden (gleicher Build-Befehl)
+
+## Wo weitermachen
+
+**Empfohlene nächste Schritte (in dieser Reihenfolge):**
+
+1. Kap 4 Eröffner-Demo bauen — Datei-Reise-Pfad
+2. Kap 5 Eröffner-Demo bauen — EXIF-Overlay
+3. Pro Kapitel die 3–4 wichtigsten neuen Demos (z.B. JPEG-Pipeline-Stationen, USB-C-drei-Achsen, CDN-Schema)
+4. Phase 4 starten: Slide-MD-Files pro Kapitel schreiben, dabei existierende + neue Demos einbinden
+5. Build-Test (`make build-223015b`), Render-Spot-Check
+6. Erste Dozenten-Lesart durch Kapitel 1+2, justieren
+7. Iterativ Kap 3–5
+8. PR auf `main`, Review, Merge, Deploy
+
+## Wichtige Konventionen
+
+- **Keine Emojis** — auch nicht als Icons in HTML-Demos
+- **„Bit"/„Byte" sind Maßwörter** — kein s-Plural („Bits"/„Bytes")
+- **„Selbstlernen"**, nicht „Hands-On"
+- **Klausur-Folien bleiben verstreut** — kein Sammelblock am Kapitel-Ende
+- **Lernziele = Vorschläge** an den Dozenten, nicht gesetzte Anforderungen; Default Bloom-Level Verstehen
+- **Render vor Layout-Aussage** — chromium-headless, dann PNG mit Read-Tool inspizieren
+- **Advance Organizer = Erkenntnisgewinn**, nicht Topic-Boxen mit Pfeilen
+
+## Branch-Operationen
+
+```bash
+# Stand sehen
+git log --oneline refactor/didaktik-rewrite-2026
+
+# Auf neuesten Stand bringen
+git switch refactor/didaktik-rewrite-2026
+git pull origin refactor/didaktik-rewrite-2026
+
+# Plan-Datei
+cat ~/.claude/plans/1-infinity-2-neue-wild-ember.md
+```
diff --git a/slides/223015b/assets/demos/kap02-eroeffner.html b/slides/223015b/assets/demos/kap02-eroeffner.html
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+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Dieselbe Aufnahme, zwei Formate</title>
+<style>
+  :root {
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --soft: #f8fafc;
+    --border: #cbd5e1;
+    --hl: #d63384;
+    --lossless: #16a34a;
+    --lossy: #ef4444;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 36px 48px; }
+  h1 { text-align: center; margin: 0 0 6px; font-size: 1.85rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 28px; font-size: 1.05rem; }
+
+  .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; max-width: 1200px; margin: 0 auto; }
+  .panel { border: 2px solid var(--border); border-radius: 12px; padding: 22px 24px; display: flex; flex-direction: column; gap: 14px; background: #fff; }
+  .panel.left  { border-color: var(--lossless); }
+  .panel.right { border-color: var(--lossy); }
+
+  .panel-head { display: flex; justify-content: space-between; align-items: baseline; }
+  .panel-tag {
+    font-size: 0.74rem;
+    font-weight: 700;
+    letter-spacing: 0.12em;
+    text-transform: uppercase;
+    color: var(--muted);
+  }
+  .panel-name { font-size: 1.5rem; font-weight: 700; }
+  .panel.left .panel-name { color: var(--lossless); }
+  .panel.right .panel-name { color: var(--lossy); }
+  .panel-format {
+    font-family: ui-monospace, "SF Mono", Menlo, monospace;
+    font-size: 0.85rem;
+    color: var(--muted);
+  }
+
+  .waveform {
+    background: #0f0f23;
+    border-radius: 8px;
+    padding: 6px;
+    display: block;
+  }
+
+  .stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
+  .stat { background: var(--soft); border: 1px solid var(--border); border-radius: 7px; padding: 8px 12px; }
+  .stat .label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-weight: 700; }
+  .stat .value { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 1rem; font-weight: 700; color: var(--dark); margin-top: 2px; }
+
+  .verdict {
+    margin-top: 26px;
+    border: 2px solid var(--hl);
+    background: #fff;
+    border-radius: 12px;
+    padding: 16px 22px;
+    text-align: center;
+    max-width: 1200px;
+    margin-left: auto;
+    margin-right: auto;
+  }
+  .verdict-q { font-size: 1.2rem; font-weight: 700; color: var(--hl); }
+  .verdict-a { font-size: 1rem; color: var(--dark); margin-top: 6px; }
+  .verdict-a strong { color: var(--hl); }
+</style>
+</head>
+<body>
+  <h1>Dieselbe Aufnahme, zwei Formate</h1>
+  <div class="sub">3 Sekunden Snare-Hit mit Cymbal-Tail · 44,1 kHz Sample-Rate · Stereo</div>
+
+  <div class="grid">
+
+    <div class="panel left">
+      <div class="panel-head">
+        <span class="panel-name">Lossless</span>
+        <span class="panel-tag">FLAC</span>
+      </div>
+      <div class="panel-format">verlustfrei · alle Frequenzen 0–22 kHz erhalten</div>
+
+      <svg class="waveform" viewBox="0 0 800 160" preserveAspectRatio="none">
+        <defs>
+          <linearGradient id="green-grad" x1="0" y1="0" x2="0" y2="1">
+            <stop offset="0%" stop-color="#34d399"/>
+            <stop offset="100%" stop-color="#16a34a"/>
+          </linearGradient>
+        </defs>
+        <line x1="0" y1="80" x2="800" y2="80" stroke="#374151" stroke-width="1"/>
+        <!-- detailed waveform: transient peak + cymbal decay with high-freq noise -->
+        <path d="M0,80
+          L40,80 L42,78 L44,82 L46,74 L48,88
+          L60,30 L62,135 L64,18 L66,142 L68,28 L70,128 L72,38 L74,118 L76,48 L78,108
+          L90,55 L92,108 L94,52 L96,112 L98,58 L100,105 L102,62 L104,98 L106,68 L108,92
+          L130,72 L132,92 L134,68 L136,94 L138,72 L140,90 L142,74 L144,88
+          L170,76 L172,86 L174,74 L176,87 L178,76 L180,85
+          L220,77 L222,84 L224,76 L226,85 L228,77 L230,83
+          L280,78 L282,83 L284,77 L286,84 L288,78 L290,82
+          L340,79 L342,82 L344,78 L346,82 L348,79 L350,81
+          L400,79 L402,81 L404,79 L406,81 L408,79 L410,81
+          L460,80 L462,81 L464,79 L466,81 L468,80 L470,80
+          L520,80 L522,81 L524,79 L526,80
+          L580,80 L582,80 L584,80
+          L640,80 L700,80 L800,80 Z"
+          fill="url(#green-grad)" stroke="#16a34a" stroke-width="1" opacity="0.95"/>
+      </svg>
+
+      <div class="stats">
+        <div class="stat"><div class="label">Dateigröße</div><div class="value">5,3 MB</div></div>
+        <div class="stat"><div class="label">Bitrate</div><div class="value">1.411 kbit/s</div></div>
+      </div>
+    </div>
+
+    <div class="panel right">
+      <div class="panel-head">
+        <span class="panel-name">Lossy</span>
+        <span class="panel-tag">MP3 128 kbit/s</span>
+      </div>
+      <div class="panel-format">verlustbehaftet · hohe Frequenzen weggeworfen, Transienten geglättet</div>
+
+      <svg class="waveform" viewBox="0 0 800 160" preserveAspectRatio="none">
+        <defs>
+          <linearGradient id="red-grad" x1="0" y1="0" x2="0" y2="1">
+            <stop offset="0%" stop-color="#fca5a5"/>
+            <stop offset="100%" stop-color="#ef4444"/>
+          </linearGradient>
+        </defs>
+        <line x1="0" y1="80" x2="800" y2="80" stroke="#374151" stroke-width="1"/>
+        <!-- smoothed waveform: same overall shape, no fine detail in transient peak -->
+        <path d="M0,80
+          L40,80 L48,80
+          L60,48 L65,120 L70,52 L75,115 L80,58 L85,108
+          L100,68 L108,92 L114,70 L120,90
+          L150,75 L160,86 L168,76 L174,85
+          L200,77 L210,84 L220,77 L230,83
+          L260,78 L280,82 L300,78 L320,82
+          L360,79 L380,81 L400,79 L420,81
+          L460,80 L480,80 L520,80
+          L580,80 L640,80 L700,80 L800,80 Z"
+          fill="url(#red-grad)" stroke="#ef4444" stroke-width="1" opacity="0.95"/>
+      </svg>
+
+      <div class="stats">
+        <div class="stat"><div class="label">Dateigröße</div><div class="value">0,48 MB</div></div>
+        <div class="stat"><div class="label">Bitrate</div><div class="value">128 kbit/s</div></div>
+      </div>
+    </div>
+
+  </div>
+
+  <div class="verdict">
+    <div class="verdict-q">Hört man den Unterschied?</div>
+    <div class="verdict-a">Auf dem Smartphone-Lautsprecher: meist nicht. Im Studio-Monitor mit Kopfhörer: oft schon. — MP3 wirft <strong>91 % der Daten weg</strong>, die der Mensch im Alltag nicht vermisst.</div>
+  </div>
+</body>
+</html>
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diff --git a/slides/223015b/assets/demos/kap03-eroeffner.html b/slides/223015b/assets/demos/kap03-eroeffner.html
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+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Drei Modalitäten, ein Hebel</title>
+<style>
+  :root {
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --soft: #f8fafc;
+    --border: #cbd5e1;
+    --hl: #d63384;
+    --bild: #2563eb;
+    --audio: #ea580c;
+    --video: #7c3aed;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 32px 48px; }
+  h1 { text-align: center; margin: 0 0 6px; font-size: 1.85rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 26px; font-size: 1.05rem; }
+
+  .table { display: grid; grid-template-columns: 140px 1fr 1fr 1fr; gap: 12px; max-width: 1180px; margin: 0 auto; align-items: stretch; }
+  .col-head { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; font-weight: 700; color: var(--muted); padding: 0 8px 4px; }
+
+  .row-label { font-size: 1.15rem; font-weight: 700; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; justify-content: center; border-radius: 10px; }
+  .row-label.bild { background: #dbeafe; color: var(--bild); }
+  .row-label.audio { background: #ffedd5; color: var(--audio); }
+  .row-label.video { background: #ede9fe; color: var(--video); }
+  .row-label small { font-size: 0.78rem; font-weight: 400; color: var(--muted); text-transform: none; letter-spacing: 0; }
+
+  .cell { border: 1.5px solid var(--border); border-radius: 10px; padding: 12px 14px; background: #fff; display: flex; flex-direction: column; gap: 8px; }
+  .cell-format { font-family: ui-monospace, monospace; font-size: 0.85rem; color: var(--muted); }
+  .cell-size { font-size: 1.7rem; font-weight: 700; color: var(--dark); font-family: ui-monospace, monospace; }
+  .cell-bar { height: 8px; border-radius: 4px; background: var(--soft); position: relative; overflow: hidden; }
+  .cell-bar .fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 4px; }
+
+  .verdict {
+    margin-top: 22px;
+    max-width: 1180px;
+    margin-left: auto;
+    margin-right: auto;
+    border: 2px solid var(--hl);
+    border-radius: 12px;
+    padding: 14px 22px;
+    text-align: center;
+  }
+  .verdict-q { font-size: 1.05rem; font-weight: 700; color: var(--hl); }
+  .verdict-a { font-size: 0.95rem; color: var(--dark); margin-top: 4px; }
+  .verdict-a strong { color: var(--hl); }
+</style>
+</head>
+<body>
+  <h1>Drei Modalitäten — derselbe Hebel</h1>
+  <div class="sub">Bild, Audio, Video schrumpfen alle dramatisch. Warum? Weil Wahrnehmung Lücken hat.</div>
+
+  <div class="table">
+    <div></div>
+    <div class="col-head">Roh</div>
+    <div class="col-head">Lossy (modern)</div>
+    <div class="col-head">Lossy (aggressiv)</div>
+
+    <div class="row-label bild">Bild<small>12-MP-Foto</small></div>
+    <div class="cell">
+      <div class="cell-format">RAW</div>
+      <div class="cell-size">36 MB</div>
+      <div class="cell-bar"><div class="fill" style="width:100%;background:#2563eb"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">JPEG · Q 90</div>
+      <div class="cell-size">4 MB</div>
+      <div class="cell-bar"><div class="fill" style="width:11%;background:#2563eb"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">JPEG · Q 50</div>
+      <div class="cell-size">800 KB</div>
+      <div class="cell-bar"><div class="fill" style="width:2.2%;background:#2563eb"></div></div>
+    </div>
+
+    <div class="row-label audio">Audio<small>30 s Stereo</small></div>
+    <div class="cell">
+      <div class="cell-format">WAV · 44,1 kHz · 16 bit</div>
+      <div class="cell-size">5,3 MB</div>
+      <div class="cell-bar"><div class="fill" style="width:100%;background:#ea580c"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">MP3 · 192 kbit/s</div>
+      <div class="cell-size">720 KB</div>
+      <div class="cell-bar"><div class="fill" style="width:14%;background:#ea580c"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">MP3 · 64 kbit/s</div>
+      <div class="cell-size">240 KB</div>
+      <div class="cell-bar"><div class="fill" style="width:4.5%;background:#ea580c"></div></div>
+    </div>
+
+    <div class="row-label video">Video<small>30 s · 4K · 30 fps</small></div>
+    <div class="cell">
+      <div class="cell-format">Roh · 8 bit</div>
+      <div class="cell-size">12 GB</div>
+      <div class="cell-bar"><div class="fill" style="width:100%;background:#7c3aed"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">H.264 · 25 Mbit/s</div>
+      <div class="cell-size">94 MB</div>
+      <div class="cell-bar"><div class="fill" style="width:0.8%;background:#7c3aed"></div></div>
+    </div>
+    <div class="cell">
+      <div class="cell-format">H.265 · 12 Mbit/s</div>
+      <div class="cell-size">45 MB</div>
+      <div class="cell-bar"><div class="fill" style="width:0.4%;background:#7c3aed"></div></div>
+    </div>
+  </div>
+
+  <div class="verdict">
+    <div class="verdict-q">Bilder schrumpfen ×45. Audio ×22. Video ×270.</div>
+    <div class="verdict-a">Jede Reduktion nutzt eine andere Wahrnehmungs-Lücke: <strong>Bild</strong> die geringere Farbschärfe, <strong>Audio</strong> die Maskierung, <strong>Video</strong> die Frame-zu-Frame-Ähnlichkeit.</div>
+  </div>
+</body>
+</html>
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