gendering: fehlende person-substantive in beiden kursen

- Nutzer/User -> Nutzende
- Endnutzer -> Endnutzende
- Teilnehmer -> Teilnehmende
- Programmierer/Entwickler -> Programmierende/Entwickelnde
- Web-Entwickler -> Web-Entwickelnde
- Tastatur-Nutzer -> Tastatur-Nutzende
- Benutzer -> Nutzende
- Konsumenten -> KonsumentInnen
- Künstler -> KünstlerInnen
- Autor -> AutorIn
- Fotografen -> FotografInnen
- Kunde -> KundIn

ausgenommen: code-identifiers (User, type User, /users/),
Sender/Empfänger (network protocol), Sawyer (konkrete person),
Hersteller/Betreiber (organisations-rolle).

.gitignore

@@ -2,6 +2,7 @@
 build/
 *.pdf
 *.html
+!slides/*/assets/demos/**/*.html
 .dev-index/
 
 # Dependencies
@@ -32,3 +33,4 @@ hdm-internettechnik-slides/
 # Temporary files
 *.tmp
 *.bak
+.idea

AGENTS.md

@@ -0,0 +1,197 @@
+# AGENTS.md - Agent Guidelines for HdM Slides
+
+This file contains comprehensive guidelines for agentic coding agents working on the HdM Slides project.
+
+## Project Overview
+
+This project builds presentation decks for Marp, supporting multiple courses:
+- **223015b** - Dateiformate, Schnittstellen, Speichermedien (6 Kapitel)
+- **223015c** - Internettechnologien (3 Kapitel)
+
+## Development Workflow
+
+### Build Commands
+```bash
+# Development
+make dev              # Start single dev server on port 3000
+npm run dev           # Alternative command for development server
+
+# Build
+make build            # Build all courses (HTML + PDF)
+make build-b          # Build 223015b only
+make build-c          # Build 223015c only
+make html             # HTML only builds
+make pdf              # PDF only builds
+
+# Klausur Folien
+make klausur          # Extract klausurfolien for all courses
+make klausur-b        # Extract klausurfolien for 223015b
+make klausur-c        # Extract klausurfolien for 223015c
+
+# Deployment
+make deploy            # Deploy all courses (requires explicit permission)
+make deploy-b         # Deploy 223015b only
+make deploy-c         # Deploy 223015c only
+
+# Utilities
+make qr URL=...       # Generate QR code
+make optimize-images COURSE=223015b  # Resize images
+make clean            # Remove generated files
+```
+
+### Testing
+No specific test framework is used. To validate changes:
+1. Start dev server: `make dev`
+2. Open http://localhost:3000/223015b/ or /223015c/
+3. Verify slides render correctly
+4. Run `make build` to ensure no build errors
+5. Check generated files in `build/` directory
+
+## Code Style Guidelines
+
+### File Structure
+- Slides in `slides/<course>/` following naming pattern `NN-topic.md`
+- Assets in `slides/<course>/assets/`
+- Always reference images as `./assets/filename.png`
+- Scripts in `scripts/`
+- Themes in `themes/`
+- Generated output in `build/` (gitignored)
+
+### Naming Conventions
+- Slide files: `NN-topic.md` (e.g., `01-grundlagen.md`, `02-bilder.md`)
+- Images: `snake_case.jpg` or `kebab-case.jpg`
+- Klausur files: `klausurfolien.md` (auto-generated)
+- Function names in scripts: `snake_case`
+- Variable names in scripts: `snake_case`
+
+### Markdown Style
+- Use ATX-style headers (`# ## ###`)
+- YAML frontmatter for slide metadata at top of each file
+- Never include a final `---` (creates empty slide)
+- Use `<!-- _class: klausur -->` for exam-relevant slides
+- Use relative paths for assets: `./assets/image.png`
+
+### Script Style
+- Use `#!/usr/bin/env bash` shebang
+- Use `set -e` for error handling
+- Use `2>/dev/null || true` for optional operations
+- Define variables in UPPER_CASE at script top
+- Use colors for terminal output: `\033[0;32m` etc.
+
+### Git Workflow
+- Commit messages: ALWAYS lowercase
+- NEVER add co-authoring lines or generated footers
+- Follow semantic naming: "add-...", "fix-...", "update-..."
+- Commit changes to scripts, Makefile, documentation separately from slide content
+
+## Agent Restrictions
+
+### Security
+- NEVER run commands outside `/home/mwc/Coding/hdm` folder
+- NEVER run build/deploy commands without explicit user request
+- NEVER run deploy commands (make deploy, scp, etc.) without explicit permission
+
+### File Protection
+Slide files in `slides/*/*.md` are main content files:
+- **ALLOWED**: Adding slides, adjusting content, fixing typos, enhancing sections
+- **FORBIDDEN** (without permission): Deleting slides, removing sections, bulk deletions
+- Before ANY deletion: ALWAYS ask user for confirmation
+
+### Klausur Handling
+- Klausur files (`klausurfolien.md`) are auto-generated
+- NEVER edit klausurfolien.md files directly
+- To update klausurfolien: edit source slides with `<!-- _class: klausur -->` markers
+- Run `make klausur` to regenerate
+
+## Development Patterns
+
+### Adding New Slides
+1. Create new file following `NN-topic.md` pattern
+2. Copy frontmatter from existing slides in the same course
+3. Update Makefile `_KAPITEL` variable if needed
+4. Test with `make dev`
+
+### Modifying Existing Slides
+1. Edit the appropriate markdown file in `slides/<course>/`
+2. Maintain consistent styling with course theme
+3. Preserve image paths as `./assets/...`
+4. Test changes with dev server
+
+### Working with Assets
+1. Place images in `slides/<course>/assets/`
+2. Use descriptive names: `diagram-network.jpg`, `example-code.png`
+3. Optimize with `make optimize-images COURSE=223015b`
+4. Reference as `./assets/filename.ext`
+
+### Course-Specific Configuration
+Each course has specific settings in Makefile:
+- Course name and title
+- Kapitel list (slide files)
+- Deploy path
+- Theme colors (in generate-index.sh)
+
+## Common Tasks
+
+### Debugging Build Issues
+1. Check Makefile syntax: `make -n build`
+2. Verify Marp CLI installation: `npx @marp-team/marp-cli --version`
+3. Check file permissions: `ls -la slides/`
+4. Validate markdown syntax with dev server
+
+### Updating Course Structure
+1. Update `_KAPITEL` variables in Makefile
+2. Ensure slide files follow naming convention
+3. Update course-specific themes if needed
+4. Test both dev and build processes
+
+### Working with Themes
+- Custom theme in `themes/custom-theme.css`
+- Course themes defined in individual slide frontmatter
+- Use consistent color schemes per course
+- Test theme changes across all slides
+
+## Deployment Process
+
+Deployment to production server requires explicit permission:
+1. Build process: `make build` (HTML + PDF)
+2. Index generation: automatically handled
+3. Deploy to remote server via SCP
+4. Root index deployment
+
+**IMPORTANT**: Never run deployment commands without explicit user permission.
+
+## Tools and Dependencies
+
+### Core Dependencies
+- Marp CLI for slide rendering
+- Bash scripts for automation
+- Make for build orchestration
+- Git for version control
+
+### Optional Tools
+- qrencode for QR generation (via nix)
+- ImageMagick for image optimization
+- Python 3 for simple HTTP server (legacy)
+
+## Testing Strategy
+
+Since there's no formal test suite:
+1. Manual testing with dev server
+2. Build process validation
+3. Slide rendering checks
+4. Asset path verification
+5. Cross-browser compatibility checks (important)
+
+## Troubleshooting
+
+### Common Issues
+- **Port conflicts**: Use `make dev-kill` to clean up processes
+- **Build failures**: Check file permissions and Marp CLI installation
+- **Asset loading**: Verify relative paths and file existence
+- **Deploy issues**: Check SSH keys and remote permissions
+
+### Getting Help
+1. Check this AGENTS.md file first
+2. Review Makefile targets and scripts
+3. Test changes incrementally
+4. Maintain backup of working configurations

CLAUDE.md

@@ -4,18 +4,19 @@ This project builds presentation decks for Marp, supporting multiple courses.
 
 ## Courses
 
-- **223015b** - Dateiformate, Schnittstellen, Speichermedien (6 Termine)
-- **223015c** - Internettechnologien (3 Termine)
+- **223015b** - Dateiformate, Schnittstellen, Speichermedien (6 Kapitel)
+- **223015c** - Internettechnologien (3 Kapitel)
 
 ## Agent Restrictions
 
 - Agent NEVER runs commands outside this folder
 - Agent NEVER runs build/deploy commands without explicit user request
 - Agent NEVER runs deploy commands (make deploy, scp, etc.) without explicit user permission
+- Agent NEVER runs `git checkout --` or `git restore` on files with uncommitted work. To undo specific changes, use targeted Edit operations instead.
 
 ## Critical File Protection
 
-Slide files in `courses/*/slides/*.md` are main content files:
+Slide files in `slides/*/*.md` are main content files:
 - ALLOWED: Adding slides, adjusting content, fixing typos, enhancing sections
 - FORBIDDEN (without permission): Deleting slides, removing sections, bulk deletions
 - Before ANY deletion: ALWAYS ask user for confirmation
@@ -23,9 +24,9 @@ Slide files in `courses/*/slides/*.md` are main content files:
 ## Project Structure
 
 ```
-courses/
-├── 223015b/slides/     # Dateiformate course
-└── 223015c/slides/     # Internettechnik course
+slides/
+├── 223015b/            # Dateiformate course
+└── 223015c/            # Internettechnik course
 scripts/                # Shared scripts
 themes/                 # Custom Marp themes
 build/                  # Generated output (gitignored)
@@ -34,34 +35,33 @@ build/                  # Generated output (gitignored)
 ## Build Commands
 
 ```bash
-make dev-b          # Dev server 223015b (port 1312)
-make dev-c          # Dev server 223015c (port 1313)
+make dev            # Marp live server all courses (port 1312, HMR)
+make dev-b          # Marp live server 223015b (port 1313, HMR)
+make dev-c          # Marp live server 223015c (port 1314, HMR)
 make build          # Build all courses
 make build-b        # Build 223015b only
 make build-c        # Build 223015c only
 make html           # HTML only
 make pdf            # PDF only
+make klausur        # Extract klausur slides → slides/*/klausur.md
 make deploy         # Deploy all (ASK FIRST!)
 ```
 
 ## Nix Flake Commands
 
 ```bash
-nix develop                           # Dev shell with all tools
-nix run .#qr -- "https://example.com" # Generate QR code
-nix run .#qr-slides -- 223015b        # QR for course
-nix run .#optimize-img -- <path>      # Optimize images
+nix develop                           # Dev shell with all tools (node 22, npm, make)
 ```
 
 ## Code Style Guidelines
 
 ### File Structure
-- Slides in `courses/<course>/slides/`
-- Assets in `courses/<course>/slides/assets/`
+- Slides in `slides/<course>/`
+- Assets in `slides/<course>/assets/`
 - Always reference images as `./assets/filename.png`
 
 ### Naming Conventions
-- Slide files: `YYYY-MM-DD-termin-N-topic.md`
+- Slide files: `NN-topic.md` (e.g., `01-grundlagen.md`)
 - Images: `snake_case.jpg` or `kebab-case.jpg`
 
 ### Markdown Style

Makefile

@@ -1,25 +1,19 @@
 # HdM Slides - Unified Makefile
 # Supports multiple courses: 223015b (Dateiformate) and 223015c (Internettechnik)
 
-.PHONY: help dev dev-b dev-c build build-b build-c pdf html clean install deploy qr optimize-images
+.PHONY: help dev dev-b dev-c build build-b build-c pdf html klausur clean install deploy qr optimize-images
 
 # Course configuration
 COURSES = 223015b 223015c
-COURSE_DIR = courses
-
-# Port configuration (index starts at BASE_PORT, courses increment from there)
-BASE_PORT = 1310
-INDEX_PORT = $(BASE_PORT)
+SLIDES_DIR = slides
 
 # Course-specific settings
 223015b_NAME = Dateiformate, Schnittstellen, Speichermedien
-223015b_PORT = 1311
-223015b_TERMINS = 2025-12-19-termin-0-intro 2025-12-19-termin-1-grundlagen-text-audio 2026-01-09-termin-2-bild-audio-video 2026-01-23-termin-3-speichermedien-schnittstellen 2026-01-30-termin-4-distribution-apis-zukunft 2026-xx-xx-termin-5-vertiefung-offene-fragen
+223015b_KAPITEL = 00-intro 01-grundlagen-text-audio 02-bild-audio-video 03-speichermedien-schnittstellen 04-distribution-apis-zukunft 05-vertiefung-offene-fragen klausurfolien klausurfragen
 223015b_DEPLOY_PATH = /home/tengo/html/hdm/223015b
 
 223015c_NAME = Internettechnologien
-223015c_PORT = 1312
-223015c_TERMINS = 2025-12-20-termin-1-geschichte-grundlagen-html 2026-01-10-termin-2-netzwerke-protokolle-css 2026-01-24-termin-3-interaktivitaet-javascript
+223015c_KAPITEL = 01-geschichte-grundlagen-html 02-netzwerke-protokolle-css 03-interaktivitaet-javascript klausurfolien klausurfragen
 223015c_DEPLOY_PATH = /home/tengo/html/hdm/223015c
 
 DEPLOY_HOST = tengo@tuttle.uberspace.de
@@ -33,9 +27,9 @@ help:
 	@echo "  223015c - Internettechnologien"
 	@echo ""
 	@echo "Development:"
-	@echo "  make dev         - Both servers + index (ports 1311, 1312, 1313)"
-	@echo "  make dev-b       - Dev server for 223015b (port 1312)"
-	@echo "  make dev-c       - Dev server for 223015c (port 1313)"
+	@echo "  make dev         - Marp live server all courses (port 1312, HMR)"
+	@echo "  make dev-b       - Marp live server 223015b (port 1313, HMR)"
+	@echo "  make dev-c       - Marp live server 223015c (port 1314, HMR)"
 	@echo ""
 	@echo "Build:"
 	@echo "  make build       - Build all courses"
@@ -43,6 +37,7 @@ help:
 	@echo "  make build-c     - Build 223015c only"
 	@echo "  make pdf         - Export all to PDF"
 	@echo "  make html        - Export all to HTML"
+	@echo "  make klausur     - Extract klausurfolien slides"
 	@echo ""
 	@echo "Tools:"
 	@echo "  make qr URL=...  - Generate QR code for URL"
@@ -62,36 +57,32 @@ build/.exists:
 	@mkdir -p build/223015b build/223015c
 	@touch $@
 
-# Development servers
+# Development server (Marp live server with HMR)
 dev:
 	@./scripts/dev-server.sh
 
-dev-kill:
-	@-pkill -f "python3 -m http.server" 2>/dev/null || true
-	@-pkill -f "marp-cli.*--server" 2>/dev/null || true
-	@sleep 0.5
-
 dev-b:
-	@echo "Starting 223015b dev server on port $(223015b_PORT)..."
-	@echo "Open: http://localhost:$(223015b_PORT)"
-	PORT=$(223015b_PORT) npx @marp-team/marp-cli --server $(COURSE_DIR)/223015b/slides/
+	@./scripts/dev-server.sh 223015b 1313
 
 dev-c:
-	@echo "Starting 223015c dev server on port $(223015c_PORT)..."
-	@echo "Open: http://localhost:$(223015c_PORT)"
-	PORT=$(223015c_PORT) npx @marp-team/marp-cli --server $(COURSE_DIR)/223015c/slides/
+	@./scripts/dev-server.sh 223015c 1314
+
+dev-kill:
+	@-fuser -k 1312/tcp 2>/dev/null || true
+	@-fuser -k 1313/tcp 2>/dev/null || true
+	@-fuser -k 1314/tcp 2>/dev/null || true
 
 # Build functions
 define build_course
 	@echo "Building $(1)..."
 	@mkdir -p build/$(1)
-	@cp -r $(COURSE_DIR)/$(1)/slides/assets build/$(1)/ 2>/dev/null || true
-	@cp -r $(COURSE_DIR)/$(1)/slides/materials build/$(1)/ 2>/dev/null || true
-	@for f in $($(1)_TERMINS); do \
-		if [ -f "$(COURSE_DIR)/$(1)/slides/$$f.md" ]; then \
+	@cp -r $(SLIDES_DIR)/$(1)/assets build/$(1)/ 2>/dev/null || true
+	@cp -r $(SLIDES_DIR)/$(1)/materials build/$(1)/ 2>/dev/null || true
+	@for f in $($(1)_KAPITEL); do \
+		if [ -f "$(SLIDES_DIR)/$(1)/$$f.md" ]; then \
 			echo "  Building $$f..."; \
-			npx @marp-team/marp-cli $(COURSE_DIR)/$(1)/slides/$$f.md -o build/$(1)/$$f.html; \
-			npx @marp-team/marp-cli $(COURSE_DIR)/$(1)/slides/$$f.md --pdf --allow-local-files -o build/$(1)/$$f.pdf; \
+			npx @marp-team/marp-cli $(SLIDES_DIR)/$(1)/$$f.md -o build/$(1)/$$f.html; \
+			npx @marp-team/marp-cli $(SLIDES_DIR)/$(1)/$$f.md --pdf --allow-local-files -o build/$(1)/$$f.pdf; \
 		fi \
 	done
 	@./scripts/generate-index.sh $(1) build/$(1)
@@ -110,12 +101,12 @@ build: build-b build-c
 define html_course
 	@echo "Building HTML for $(1)..."
 	@mkdir -p build/$(1)
-	@cp -r $(COURSE_DIR)/$(1)/slides/assets build/$(1)/ 2>/dev/null || true
-	@cp -r $(COURSE_DIR)/$(1)/slides/materials build/$(1)/ 2>/dev/null || true
-	@for f in $($(1)_TERMINS); do \
-		if [ -f "$(COURSE_DIR)/$(1)/slides/$$f.md" ]; then \
+	@cp -r $(SLIDES_DIR)/$(1)/assets build/$(1)/ 2>/dev/null || true
+	@cp -r $(SLIDES_DIR)/$(1)/materials build/$(1)/ 2>/dev/null || true
+	@for f in $($(1)_KAPITEL); do \
+		if [ -f "$(SLIDES_DIR)/$(1)/$$f.md" ]; then \
 			echo "  $$f.html"; \
-			npx @marp-team/marp-cli $(COURSE_DIR)/$(1)/slides/$$f.md -o build/$(1)/$$f.html; \
+			npx @marp-team/marp-cli $(SLIDES_DIR)/$(1)/$$f.md -o build/$(1)/$$f.html; \
 		fi \
 	done
 	@./scripts/generate-index.sh $(1) build/$(1)
@@ -133,10 +124,10 @@ html: html-b html-c
 define pdf_course
 	@echo "Building PDFs for $(1)..."
 	@mkdir -p build/$(1)
-	@for f in $($(1)_TERMINS); do \
-		if [ -f "$(COURSE_DIR)/$(1)/slides/$$f.md" ]; then \
+	@for f in $($(1)_KAPITEL); do \
+		if [ -f "$(SLIDES_DIR)/$(1)/$$f.md" ]; then \
 			echo "  $$f.pdf"; \
-			npx @marp-team/marp-cli $(COURSE_DIR)/$(1)/slides/$$f.md --pdf --allow-local-files -o build/$(1)/$$f.pdf; \
+			npx @marp-team/marp-cli $(SLIDES_DIR)/$(1)/$$f.md --pdf --allow-local-files -o build/$(1)/$$f.pdf; \
 		fi \
 	done
 endef
@@ -149,6 +140,16 @@ pdf-c: build/.exists
 
 pdf: pdf-b pdf-c
 
+# Klausur slide extraction
+klausur-b:
+	@./scripts/extract-klausur.sh 223015b
+
+klausur-c:
+	@./scripts/extract-klausur.sh 223015c
+
+klausur: klausur-b klausur-c
+	@echo "Klausurfolien slides extracted for all courses!"
+
 # QR Code generation (uses nix-shell)
 qr:
 ifndef URL
@@ -174,9 +175,9 @@ ifndef COURSE
 	@echo "Usage: make optimize-images COURSE=223015b"
 else
 	@echo "Optimizing images for $(COURSE)..."
-	@mkdir -p $(COURSE_DIR)/$(COURSE)/slides/assets-original
-	@nix-shell -p imagemagick --run 'for img in $(COURSE_DIR)/$(COURSE)/slides/assets/*.png $(COURSE_DIR)/$(COURSE)/slides/assets/*.jpg 2>/dev/null; do \
-		[ -f "$$img" ] && cp "$$img" $(COURSE_DIR)/$(COURSE)/slides/assets-original/ && \
+	@mkdir -p $(SLIDES_DIR)/$(COURSE)/assets-original
+	@nix-shell -p imagemagick --run 'for img in $(SLIDES_DIR)/$(COURSE)/assets/*.png $(SLIDES_DIR)/$(COURSE)/assets/*.jpg 2>/dev/null; do \
+		[ -f "$$img" ] && cp "$$img" $(SLIDES_DIR)/$(COURSE)/assets-original/ && \
 		magick "$$img" -resize "1920x>" -quality 85 "$$img" && echo "  Optimized: $$(basename $$img)"; \
 	done || true'
 	@echo "Done! Originals in assets-original/"
@@ -187,13 +188,15 @@ HDM_DEPLOY_PATH = /home/tengo/html/hdm
 
 build-index: build/.exists
 	@echo "Building root index..."
-	@echo '<!DOCTYPE html><html lang="de"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>HdM Vorlesungen</title><style>*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,sans-serif;max-width:720px;margin:0 auto;padding:3rem 1.5rem;background:#fafafa;color:#1d1d1f;line-height:1.5}h1{font-size:2rem;font-weight:600;letter-spacing:-0.02em;margin-bottom:.5rem}.subtitle{color:#86868b;font-size:1rem}.courses{margin-top:2rem;display:flex;flex-direction:column;gap:.75rem}a.course{display:block;background:#fff;border-radius:12px;padding:1.5rem;text-decoration:none;color:inherit;box-shadow:0 1px 3px rgba(0,0,0,0.08);transition:all .2s ease;cursor:pointer}a.course:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.12)}.course-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.course-b .course-label{color:#5da9e9}.course-c .course-label{color:#d63384}.course-title{font-size:1.15rem;font-weight:500;color:#1d1d1f;margin:.25rem 0}.course-info{font-size:.85rem;color:#86868b}footer{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid #e5e5e7;color:#86868b;font-size:.85rem}footer a{color:#1d1d1f;text-decoration:none}footer a:hover{text-decoration:underline}</style></head><body><h1>HdM Vorlesungen</h1><p class="subtitle">Wintersemester 2025/26 · Michael Czechowski</p><div class="courses"><a class="course course-b" href="223015b/"><span class="course-label">223015b</span><div class="course-title">Dateiformate, Schnittstellen, Speichermedien & Distributionswege</div><span class="course-info">6 Termine · Modul "Technik 1"</span></a><a class="course course-c" href="223015c/"><span class="course-label">223015c</span><div class="course-title">Grundlagen IT- und Internettechnik</div><span class="course-info">3 Termine · Modul "Technik 1"</span></a></div><footer><a href="mailto:mail@librete.ch">Kontakt</a></footer></body></html>' > build/index.html
+	@mkdir -p build
+	@./scripts/generate-root-index.sh
 
 # Deploy
 define deploy_course
 	@echo "Deploying $(1)..."
 	scp build/$(1)/*.html $(DEPLOY_HOST):$($(1)_DEPLOY_PATH)/
 	scp build/$(1)/*.pdf $(DEPLOY_HOST):$($(1)_DEPLOY_PATH)/ 2>/dev/null || true
+	scp build/$(1)/*.svg $(DEPLOY_HOST):$($(1)_DEPLOY_PATH)/ 2>/dev/null || true
 	scp -r build/$(1)/assets/ $(DEPLOY_HOST):$($(1)_DEPLOY_PATH)/
 	scp -r build/$(1)/materials/ $(DEPLOY_HOST):$($(1)_DEPLOY_PATH)/ 2>/dev/null || true
 	@echo "$(1) deployed!"
@@ -208,6 +211,7 @@ deploy-c: build-c
 deploy-index: build-index
 	@echo "Deploying root index..."
 	scp build/index.html $(DEPLOY_HOST):$(HDM_DEPLOY_PATH)/
+	scp build/qr-root.svg $(DEPLOY_HOST):$(HDM_DEPLOY_PATH)/ 2>/dev/null || true
 	@echo "Root index deployed!"
 
 deploy: build-index deploy-b deploy-c deploy-index

README.md

@@ -1,182 +1,97 @@
 # HdM Slides
 
-**Modul "Technik 1"** - 1. Semester - Digital- und Medienwirtschaft
-Hochschule der Medien Stuttgart - Wintersemester 2025/26
+Presentation slides for HdM Stuttgart courses, built with [Marp](https://marp.app/).
 
----
+## Courses
 
-## Kurse
+| Code | Title | Kapitel |
+|------|-------|---------|
+| 223015b | Dateiformate, Schnittstellen, Speichermedien | 6 |
+| 223015c | Internettechnologien | 3 |
 
-### 223015b - Dateiformate, Schnittstellen, Speichermedien & Distributionswege
+## Project Structure
 
-| # | Datum | Thema |
-|---|-------|-------|
-| 0 | 19.12.2025 | Intro |
-| 1 | 19.12.2025 | Grundlagen, Text & Audio |
-| 2 | 09.01.2026 | Bild- & Videoformate |
-| 3 | 23.01.2026 | Speichermedien & Schnittstellen |
-| 4 | 30.01.2026 | Distribution, APIs & Zukunft |
-| 5 | TBA | Vertiefung & offene Fragen |
-
-### 223015c - Internettechnologien
-
-| # | Datum | Thema |
-|---|-------|-------|
-| 1 | 20.12.2025 | Geschichte, Grundlagen & HTML |
-| 2 | 10.01.2026 | Netzwerke, Protokolle & CSS |
-| 3 | 24.01.2026 | Interaktivitat & JavaScript |
-
-**Dozent:** Michael Czechowski - mail@librete.ch
-
----
-
-## Quick Start
-
-### Mit Nix (empfohlen)
-
-```bash
-# Development shell mit allen Tools
-nix develop
-
-# Oder direkt QR-Code generieren
-nix run .#qr -- "https://example.com"
-nix run .#qr-slides -- 223015b
 ```
-
-### Ohne Nix
-
-```bash
-npm install
-make dev-b   # 223015b auf Port 1312
-make dev-c   # 223015c auf Port 1313
+slides/
+├── 223015b/          # Dateiformate course
+│   ├── 00-intro.md
+│   ├── 01-grundlagen-text-audio.md
+│   └── ...
+└── 223015c/          # Internettechnik course
+    ├── 01-geschichte-grundlagen-html.md
+    └── ...
+scripts/              # Build scripts
+build/                # Generated output (gitignored)
 ```
 
----
-
 ## Development
 
-### Dev Server starten
-
 ```bash
-make dev-b   # 223015b (Dateiformate) - http://localhost:1312
-make dev-c   # 223015c (Internettechnik) - http://localhost:1313
+# Start development server (hot reload)
+make dev              # Single server for all courses (port 3000)
+
+# Access individual courses:
+# 223015b: http://localhost:3000/223015b/
+# 223015c: http://localhost:3000/223015c/
 ```
 
-### Build
+## Build
 
 ```bash
-make build      # Alle Kurse (HTML + PDF)
-make build-b    # Nur 223015b
-make build-c    # Nur 223015c
-make html       # Nur HTML
-make pdf        # Nur PDF
+make build            # Build all (HTML + PDF)
+make build-b          # Build 223015b only
+make build-c          # Build 223015c only
+make html             # HTML only
+make pdf              # PDF only
 ```
 
-### Deploy
+## Klausur Folien
+
+Extract exam-relevant slides (marked with `<!-- _class: klausur -->`) into a single file:
 
 ```bash
-make deploy     # Alle Kurse
-make deploy-b   # Nur 223015b
-make deploy-c   # Nur 223015c
+make klausur          # Extract all courses
+make klausur-b        # 223015b only
+make klausur-c        # 223015c only
 ```
 
----
+Output: `slides/<course>/klausurfolien.md`
+
+The generated file includes:
+- A title slide per kapitel for orientation
+- All slides marked with `<!-- _class: klausur -->`
 
 ## Tools
 
-### QR-Code Generator
+```bash
+make qr URL=https://example.com           # Generate QR code
+make qr-slides COURSE=223015b             # QR for course URL
+make optimize-images COURSE=223015b       # Resize images
+```
+
+## Deploy
 
 ```bash
-# Mit Nix
-nix run .#qr -- "https://librete.ch/hdm/223015b/"
-nix run .#qr -- "https://example.com" output.png
-
-# Mit Make
-make qr URL=https://example.com
-make qr URL=https://example.com OUTPUT=my-qr.png
-
-# Fur Kurse
-make qr-slides COURSE=223015b
+make deploy           # Deploy all courses
+make deploy-b         # Deploy 223015b only
+make deploy-c         # Deploy 223015c only
 ```
 
-### Bilder optimieren
+## Marking Slides as Klausur-Relevant
 
-```bash
-# Mit Nix
-nix run .#optimize-img -- courses/223015b/slides/assets/
-
-# Mit Make
-make optimize-images COURSE=223015b
-```
-
----
-
-## Projektstruktur
-
-```
-hdm/
-├── courses/
-│   ├── 223015b/
-│   │   └── slides/
-│   │       ├── 2025-12-19-termin-1-grundlagen-text-audio.md
-│   │       ├── assets/
-│   │       └── materials/
-│   └── 223015c/
-│       └── slides/
-│           ├── 2025-12-20-termin-1-geschichte-grundlagen-html.md
-│           └── assets/
-├── scripts/
-│   └── generate-index.sh
-├── themes/
-│   └── custom-theme.css
-├── build/           # Generated output
-├── flake.nix        # Nix flake with tools
-├── Makefile
-└── package.json
-```
-
----
-
-## Slides erstellen
-
-### Frontmatter
-
-```yaml
----
-marp: true
-theme: uncover
-paginate: true
-backgroundColor: #fff
----
-```
-
-### Slide-Trennung
+Add this comment block after the slide separator:
 
 ```markdown
-# Slide 1
-
-Content
-
 ---
 
-# Slide 2
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #e3f2fd -->
 
-More content
+# Your Slide Title
+
+Content here...
 ```
 
-### Bilder
-
-```markdown
-![Alt text](./assets/image.jpg)
-```
-
-### Themes
-
-Built-in: `default`, `gaia`, `uncover`
-Custom: in `themes/` Verzeichnis
-
----
-
-## License
-
-[CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
+The `klausur` class adds a visual indicator (diagonal stripes) during presentation.

courses/223015b/slides/2025-12-19-termin-0-intro.md

@@ -1,234 +0,0 @@
----
-marp: true
-theme: gaia
-paginate: true
-backgroundColor: #fff
-header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
-title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
----
-
-<style>
-:root {
-  --color-foreground: #1a1a2e;
-  --color-highlight: #5da9e9;
-  --color-dimmed: #4a4a6a;
-}
-section.invert {
-  --color-foreground: #fff;
-}
-section {
-  font-size: 1.7rem;
-}
-h2 {
-  color: var(--color-highlight);
-}
-pre {
-  background: #0f0f23;
-  color: #5da9e9;
-  border-radius: 8px;
-  border-left: 3px solid #5da9e9;
-}
-pre code {
-  background: transparent;
-  color: inherit;
-}
-code {
-  background: #1a1a2e;
-  color: #5da9e9;
-  padding: 0.15em 0.4em;
-  border-radius: 4px;
-}
-a {
-  color: var(--color-highlight);
-}
-section.klausur {
-  background: #e3f2fd !important;
-}
-section.klausur footer {
-  display: none;
-}
-</style>
-
-<!-- _class: invert -->
-<!-- _header: '' -->
-<!-- _backgroundColor: #000 -->
-
-![bg fit opacity:0.4](./assets/digital-landscape.png)
-
-# Dateiformate, Schnittstellen, Speichermedien & Distributionswege
-
-**223015b** · Modul "Technik 1" · 1. Semester
-Digital- und Medienwirtschaft
-Hochschule der Medien Stuttgart
-
-**Wintersemester 2025/26**
-
-[https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
-
----
-
-![bg fit](./assets/qrcode-0.svg)
-
----
-
-<!-- _class: lead -->
-
-# Willkommen!
-## Einführung
-
----
-
-# Über mich
-
-**Michael Czechowski**
-
-- Irgendwas mit IT, Cloud und AI
-- Schwerpunkte:
-  - Web-Technologien, Barriere-Armut, Systemarchitektur, Open Source
-- Hintergrund:
-  - Philosophie (Uni Stuttgart) -> NO degree
-  - Wirtschafts-Informatik (Leibniz-FH) -> B.Sc.
-- Kontakt: mail@librete.ch
-
-<!--
-Kurze Vorstellung
-Praxisbezug betonen
-Fragen jederzeit willkommen
--->
-
----
-
-<!-- _footer: '' -->
-
-![bg fit](./assets/jung-naiv.png)
-
----
-
-# AMA (Ask my anything)
-
-*Nur ein Vorschlag ...*
-
-* Hast du alle Bände von AoT daheim?
-* Hast du eine Studierenden-Kneipe mal geleitet?
-* Hast du wirklich 17 Semester Philosophie ohne Abschluss studiert?
-
----
-
-# Kurze Umfrage
-
-**Bitte Hand heben:**
-
-1) Wer hat schon mal ein Video komprimiert/konvertiert?
-2) Wer kennte die 3-2-1 Regel?
-3) Wer weiß, was der Unterschied zwischen JPEG und PNG ist?
-4) Wer hat schon mal mit APIs gearbeitet?
-5) Wer weiß, was UTF-8 bedeutet?
-6) Wer hat schon mal mit einem CLI gearbeitet?
-6) **Wer hat schon mal etwas mit HTML oder CSS gemacht?** (Hex-Farben wie `#FF0000`?)
-
-<!--
-Niveau der Gruppe einschätzen
-Keine falschen Antworten
-Zeigt, wo wir starten
-HTML/CSS-Frage: Viele kennen Hex-Codes aus Webdesign
-API = Application Programming Interface
--->
-
----
-
-# Warum dieses Modul?
-
-**Digitale Medien sind überall** – aber was steckt dahinter?
-
-* Warum ist ein JPEG kleiner als ein PNG?
-* Warum klingt MP3 anders als FLAC?
-* Warum zeigt meine 1 TB Festplatte nur 931 GB?
-* Warum ist USB-C so verwirrend?
-* Wie funktioniert eigentlich Streaming?
-* **→ Die Technik dahinter verstehen!**
-
-<!--
-Praxisnahe Fragen aus dem Alltag
-Nicht nur "was", sondern "warum"
-Verständnis für technische Entscheidungen
--->
-
----
-
-# Das Ziel
-
-**Technische Grundlagen verstehen**, um fundierte Entscheidungen treffen zu können.
-
-Als Digital- und Medienwirtschaftler:innen werdet ihr täglich mit technischen Fragen konfrontiert:
-* Welches Format für welchen Zweck?
-* Welche Schnittstelle für welches Gerät?
-* Wie funktioniert die Distribution digitaler Inhalte?
-* **→ Mitreden können – nicht (zwingend) programmieren!**
-
-<!--
-Nicht: Ihr sollt Programmierer werden
-Sondern: Ihr sollt technische Entscheidungen verstehen
-Praxisbezug: Medienproduktion, Marketing, Projektmanagement
--->
-
----
-
-# Was ihr lernt
-
-**In dieser Veranstaltung erwerbt ihr folgende Kompetenzen:**
-
-* Fundiertes Grundwissen über Daten und Informationen
-* Dateiformate analysieren und verstehen
-* Grundlagen von Kompression (Audio, Bild, Video)
-* Speichermedien unterscheiden
-* Programmier-Schnittstellen kennenlernen
-* APIs und Distributionswege verstehen
-
-<!--
-Fokus auf Verständnis, nicht auf Programmierung
-Hands-On jede Woche: Selbst ausprobieren
-Ziel: Einblick in die Denkweise von Software-Entwicklern
--->
-
----
-
-# Kursübersicht
-
-**5 Termine:**
-
-| # | Datum | Thema |
-|---|-------|-------|
-| 1 | 19.12.2025 | Bits, Bytes, Zeichenkodierung & Audio |
-| 2 | 09.01.2026 | Bild- & Video-Kompression |
-| 3 | 23.01.2026 | Speichermedien & Schnittstellen |
-| 4 | 30.01.2026 | Distribution, APIs & Zukunft |
-| 5 | TBA | Vertiefung & offene Fragen |
-
-**Format:** Theorie + Hands-On (30-40 Min pro Termin)
-
-<!--
-Nicht nur theoretische Inhalte
-Praktische Übungen jede Woche
-Medienwissenschaftler:innen, nicht Informatiker:innen
--->
-
----
-
-# Prüfungsleistung 18.02.
-
-**Nach aktuellem Kenntnisstand:**
-
-* 90 min (40% Grundlagen, 40% Dateiformate, 20% AV)
-* Schriftliche Klausur
-* Teils offene Fragen
-* Vermutlich digital
-* Kein Coding!
-* **Prüfungsrelevant:** Alles in den Folien/im Skript
-
-<!--
-Details können sich noch ändern
-Keine Programmieraufgaben
-Verständnisfragen, keine Auswendiglernerei
--->
-

courses/223015b/slides/2026-01-09-termin-2-bild-audio-video.md

@@ -1,880 +0,0 @@
----
-marp: true
-theme: gaia
-paginate: true
-backgroundColor: #fff
-header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
-title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
----
-
-<style>
-:root {
-  --color-foreground: #1a1a2e;
-  --color-highlight: #5da9e9;
-  --color-dimmed: #4a4a6a;
-}
-section.invert {
-  --color-foreground: #fff;
-}
-section {
-  font-size: 1.7rem;
-}
-h2 {
-  color: var(--color-highlight);
-}
-pre {
-  background: #0f0f23;
-  color: #5da9e9;
-  border-radius: 8px;
-  border-left: 3px solid #5da9e9;
-}
-pre code {
-  background: transparent;
-  color: inherit;
-}
-code {
-  background: #1a1a2e;
-  color: #5da9e9;
-  padding: 0.15em 0.4em;
-  border-radius: 4px;
-}
-a {
-  color: var(--color-highlight);
-}
-section.klausur {
-  background: #e3f2fd !important;
-}
-section.klausur footer {
-  display: none;
-}
-</style>
-
-<!-- _class: invert -->
-<!-- _header: '' -->
-<!-- _footer: '' -->
-<!-- _backgroundColor: #000 -->
-
-![bg fit opacity:0.4](./assets/digital-landscape.png)
-
-# Dateiformate, Schnittstellen, Speichermedien & Distributionswege
-
-**223015b** · Modul "Technik 1" · 1. Semester
-Digital- und Medienwirtschaft
-Hochschule der Medien Stuttgart
-
-**Wintersemester 2025/26**
-
-[https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg fit](./assets/qr/slides-223015b.png)
-
----
-
-<!-- _class: lead -->
-
-# Termin 2 – 09.01.2026
-## Bild-, Audio- & Videoformate
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/photo-comparison.png)
-
-<!--
-Links: Hochauflösend
-Rechts: Stark komprimiert (JPEG-Artefakte sichtbar)
-Instagram-Effekt
--->
-
----
-
-# Was ist ein Bild?
-
-**Digital = Pixelraster**
-
-**Beispiel: 1920×1080 (Full HD)**
-= 2.073.600 Pixel
-
-**Jedes Pixel = 3 Bytes (RGB)**
-2.073.600 × 3 = **6,2 MB**
-
-**Für EIN Foto!**
-
-<!--
-Zoom auf Pixel-Ebene zeigen
-Jedes Pixel = RGB-Tripel (3 Bytes)
-6 MB × 10.000 Fotos = 62 GB
-Smartphone-Speicher wäre schnell voll ohne Kompression
--->
-
----
-
-<!-- _class: klausur -->
-<!-- _footer: '' -->
-
-# Rastergrafiken (Bitmaps)
-
-**Aufbau:** 2D-Array von Pixeln mit Farbwerten
-
-**Speicherbedarf (unkomprimiert):**
-Breite × Höhe × Farbtiefe (in Bytes)
-→ 1920×1080 × 3 Byte (RGB) = **6,2 MB**
-
-**Farbtiefe:**
-- 1 Bit = 2 Farben (S/W)
-- 8 Bit = 256 Farben (Graustufen/Palette)
-- 24 Bit = 16,7 Mio. Farben (True Color)
-- 32 Bit = True Color + Alpha (Transparenz)
-
-**Skalierung:** Interpolation (Nearest Neighbor, Bilinear, Bicubic)
-
-<!--
-DEFINITION: Bitmap = Bit-mapped graphics, 2D-Matrix aus Pixeln
-BERECHNUNG SPEICHERBEDARF: Breite × Höhe × (Farbtiefe / 8)
-BEISPIEL: 1920×1080 × 24 Bit = 1920×1080×3 = 6.220.800 Bytes ≈ 6,2 MB
-FARBTIEFE erklärt:
-- 1 Bit: 2^1 = 2 Farben (Schwarz/Weiß, Fax)
-- 8 Bit: 2^8 = 256 Farben (GIF, Graustufen)
-- 24 Bit: 2^24 = 16.777.216 Farben (True Color, RGB je 8 Bit)
-- 32 Bit: 24 Bit + 8 Bit Alpha-Kanal (Transparenz)
-INTERPOLATION bei Skalierung:
-- Nearest Neighbor: Schnell, pixelig (Pixel-Art)
-- Bilinear: Mittelwert aus 4 Nachbarn (Standard)
-- Bicubic: 16 Nachbarn, glatter (Photoshop-Standard)
-- Lanczos: Beste Qualität, rechenintensiv
-PRÜFUNGSRELEVANT: Speicherberechnung, Farbtiefe-Tabelle, warum Vergrößern problematisch
--->
-
----
-
-<!-- _class: klausur -->
-<!-- _footer: '' -->
-
-# Vektorgrafiken
-
-**Speicherung als geometrische Primitive:**
-- Pfade (Bézierkurven mit Kontrollpunkten)
-- Grundformen (Rechteck, Ellipse, Polygon)
-- Text (Glyphen als Outlines)
-
-**SVG-Beispiel:**
-`<circle cx="50" cy="50" r="40" fill="#ff0000"/>`
-→ 3 Parameter statt 5.027 Pixel (r=40)
-
-**Rendering-Pipeline:**
-Vektordaten → Rasterisierung → Framebuffer → Display
-
-**Auflösungsunabhängig:** Gleiche Datei für Icon (32px) und Plakat (3m)
-
-<!--
-PRIMITIVE: Grundbausteine der Vektorgrafik
-- Pfade: Sequenz von Punkten, verbunden durch Linien/Kurven
-- Bézierkurven: Quadratisch (3 Kontrollpunkte), Kubisch (4 Kontrollpunkte)
-- Formen: Rechteck, Ellipse, Polygon (intern als Pfade)
-SVG-SYNTAX Beispiele:
-- <rect x="0" y="0" width="100" height="50"/>
-- <circle cx="50" cy="50" r="25"/>
-- <path d="M 0 0 L 100 100"/> (MoveTo, LineTo)
-BERECHNUNG: Kreis mit r=40 → Fläche = π×40² ≈ 5.027 Pixel vs. 3 Parameter
-RENDERING-PIPELINE: Vector → Tessellation → Rasterization → Framebuffer
-FORMATE:
-- SVG: XML-basiert, Web-Standard, editierbar
-- PDF: Seiten-Beschreibungssprache, Vektoren + Raster gemischt
-- AI/EPS: Adobe-proprietär, Druckvorstufe
-PRÜFUNGSRELEVANT: Warum Vektoren skalierbar, SVG-Grundsyntax, Rendering-Pipeline
--->
-
----
-
-<!-- _class: klausur -->
-<!-- _footer: '' -->
-
-# Raster vs. Vektor: Entscheidungskriterien
-
-| Kriterium | Raster | Vektor |
-|---|---|---|
-| **Speicherung** | Pixelmatrix | Geometrie + Attribute |
-| **Skalierung** | Qualitätsverlust | Verlustfrei |
-| **Komplexität** | O(Breite × Höhe) | O(Anzahl Objekte) |
-| **Bearbeitung** | Pixelbasiert | Objektbasiert |
-
-**Wann Raster?** Fotos, Texturen, komplexe Farbverläufe
-**Wann Vektor?** Logos, Icons, Typografie, technische Zeichnungen
-
-**Konvertierung:**
-- Raster → Vektor: Tracing (verlustbehaftet, approximiert)
-- Vektor → Raster: Rasterisierung (exakt, aber auflösungsgebunden)
-
-<!--
-KOMPLEXITÄT erklärt:
-- Raster O(w×h): Speicher wächst mit Pixelanzahl
-- Vektor O(n): Speicher wächst mit Objektanzahl
-BEISPIEL: Foto einer Wiese
-- Raster: 1920×1080 = 2 Mio. Pixel, komprimiert ~500 KB
-- Vektor: Jeder Grashalm ein Pfad → Millionen Objekte, unkomprimierbar
-KONVERTIERUNG:
-- Raster→Vektor (Tracing): Kantenerkennung, verlustbehaftet
-  - Tools: Potrace (Open Source), Adobe Live Trace, Inkscape
-  - Funktioniert gut: Logos, Zeichnungen, Text
-  - Funktioniert schlecht: Fotos, Farbverläufe
-- Vektor→Raster (Rasterisierung): Exakt, aber Auflösung fixiert
-  - Jeder Bildschirm macht das (GPU)
-  - Export: "Auflösung" wählen = Ziel-Pixelgröße
-ENTSCHEIDUNGSBAUM:
-- Foto/Screenshot? → Raster
-- Logo/Icon/Diagramm? → Vektor
-- Druckvorlage? → Vektor (Auflösungsunabhängig)
-- Web-Animation? → SVG (Vektor) oder Video (Raster)
-PRÜFUNGSRELEVANT: Wann welches Format, Konvertierungsrichtungen und deren Eigenschaften
--->
-
----
-
-# Lossless: PNG
-
-**PNG = Portable Network Graphics (1996)**
-
-**Funktionsweise:**
-- Vorhersage (Pixel ähneln Nachbarn)
-- Differenz-Encoding
-- DEFLATE-Algorithmus (wie ZIP)
-
-**Kompression:** 20-50% Ersparnis
-
-**Gut für:** Screenshots, Logos, Text
-**Schlecht für:** Fotos
-
-<!-- 
-PNG wurde entwickelt als GIF-Alternative (Patent-Probleme)
-Lossless: Originaldaten bleiben erhalten
-Transparenz: Alpha-Kanal (sanfte Übergänge)
-DEFLATE: Gleicher Algorithmus wie ZIP
--->
-
----
-
-# Lossy: JPEG
-
-**JPEG = Joint Photographic Experts Group (1992)**
-
-**Eigenschaften:**
-- Lossy Kompression
-- 90%+ Platzersparnis möglich
-- Artefakte bei hoher Kompression
-
-**6 MB → 500 KB** (typisch)
-
-<!-- 
-JPEG-Norm beschreibt nur Kompression, nicht Speicherformat
-JFIF = JPEG File Interchange Format (das eigentliche Dateiformat)
-Dateierweiterungen: .jpg, .jpeg, .jfif (alle gleich)
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/jpeg-artifacts.png)
-
-<!--
-Beispiel: Stark komprimiertes JPEG
-Blocking (8×8-Blöcke sichtbar)
-Ringing (Geister um Kanten)
-Color Banding (Verläufe "treppig")
--->
-
----
-
-# Wie funktioniert JPEG? (1/2)
-
-**Schritt 1: RGB → YCbCr**
-- Y = Helligkeit (Luminanz)
-- Cb/Cr = Farbe (Chrominanz)
-
-**Warum?** Menschen sehen Helligkeit besser als Farbe
-
-**Schritt 2: Chroma Subsampling**
-Farbauflösung reduzieren (4:2:0)
-→ 50% Datenmenge weg, kaum sichtbar
-
-<!-- 
-YCbCr = Farbraum-Konversion
-Y = Brightness, Cb = Blue-Yellow, Cr = Red-Green
-4:2:0 Subsampling: Farbe nur jedes 2. Pixel horizontal & vertikal
-Auge merkt's kaum, weil Helligkeitssehen dominiert
--->
-
----
-
-# Wie funktioniert JPEG? (2/2)
-
-**Schritt 3: DCT (Discrete Cosine Transform)**
-Bild in 8×8-Blöcke → Frequenzspektrum
-
-**Schritt 4: Quantisierung**
-Hohe Frequenzen (Details) stark reduzieren
-→ **Hier passiert Datenverlust!**
-
-**Schritt 5: Huffman-Coding**
-Lossless-Kompression der Restdaten
-
-<!-- 
-DCT: Ähnlich wie FFT bei Audio
-8×8 Blöcke: Warum JPEG "blocky" wird bei hoher Kompression
-Quantisierung: Quality-Schieberegler steuert genau das
-Huffman: Finale Effizienz (wie bei MP3)
--->
-
----
-
-# JPEG Quality
-
-| Quality | Dateigröße | Artefakte |
-|---------|------------|-----------|
-| **100** | ≈2-3 MB | Kaum |
-| **85-90** | ≈200-400 KB | Minimal |
-| **50** | ≈100 KB | Sichtbar |
-
-**Sweet Spot: 85-90**
-10x Kompression, für Menschen kaum unterscheidbar
-
-<!-- 
-Quality 100 = Minimum Compression (nicht lossless!)
-Quality 85-90 = Standard für Web
-Quality 50 = Sichtbare Artefakte (Blocking, Ringing)
-Photoshop "Save for Web": Standard ist 60
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/gif-animation.png)
-
-<!--
-GIF-Animation (z.B. Meme)
-256 Farben, aber Animationen möglich
--->
-
----
-
-# Die GIF-Geschichte
-
-**GIF = Graphics Interchange Format (1987)**
-CompuServe (US-Online-Dienst)
-
-**Features:**
-- 256 Farben max (8-bit Palette)
-- Lossless (für Palette)
-- Animationen!
-
-**1994 Twist:** Unisys hält Patent auf LZW-Kompression
-→ Fordert Lizenzgebühren
-
-→ **"Burn All GIFs!" Kampagne**
-
-<!-- 
-CompuServe: Früher Online-Dienst (1969-2009)
-LZW = Lempel-Ziv-Welch Compression
-Unisys Patent-Trolling: Erst Jahre nach GIF-Einführung
-Community-Reaktion: Boykott, Suche nach Alternative
-Ergebnis: PNG wurde entwickelt (1996)
--->
-
----
-
-# PNG vs. GIF
-
-**GIF:**
-✓ Animationen
-✓ Breite Unterstützung
-❌ Nur 256 Farben
-❌ Patent-Probleme (bis 2003)
-
-**PNG:**
-✓ Millionen Farben
-✓ Alpha-Transparenz
-✓ Patent-frei
-❌ Keine Animationen (bis APNG, 2004)
-
-**Ergebnis:** PNG für Grafiken, GIF für Memes!
-
-<!-- 
-APNG = Animated PNG (Firefox, Safari support)
-WebP (Google, 2010): Animationen + bessere Kompression
-GIF überlebte kulturell (Meme-Format)
-"GIF" Aussprache: "Jif" vs. "Gif" – ewiger Streit
--->
-
----
-
-# WebP & AVIF
-
-**WebP (Google, 2010):**
-- Lossy UND Lossless
-- Animationen
-- 25-35% kleiner als JPEG
-
-**AVIF (2019):**
-- Basiert auf AV1-Video-Codec
-- 50% kleiner als JPEG
-- HDR-Unterstützung
-- Patent-frei
-
-<!-- 
-WebP: Von Google entwickelt, deshalb Skepsis
-AVIF: Alliance for Open Media (Google, Netflix, Amazon, Mozilla...)
-Browser-Support 2024: WebP fast überall, AVIF wachsend
-JPEG bleibt dominant (Kompatibilität!)
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/instagram-quality-loss.png)
-
-<!--
-Vorher/Nachher: Hochauflösend vs. Instagram-Upload
-Sichtbare Qualitätsverluste
--->
-
----
-
-# Warum Instagram eure Fotos "ruiniert"
-
-**Upload-Pipeline:**
-1. Dein Foto: 12 MP, 8 MB
-2. Instagram skaliert: max. 1080px
-3. Re-Kompression: JPEG Quality ~75
-4. Endgröße: 200-400 KB
-
-**Warum?**
-- Speicherkosten (Milliarden Fotos!)
-- Ladezeiten (Mobile)
-- Bandbreite (günstiger)
-
-<!-- 
-Instagram ist keine Kunstgalerie
-Optimiert für Geschwindigkeit, nicht Qualität
-Facebook macht dasselbe
-Lösung: Portfolio-Websites (eigene Kontrolle)
--->
-
----
-
-![bg right:25%](./assets/qr/squoosh.png)
-
-# Hands-On: Kompression vergleichen
-
-**Aufgabe (40 Min):**
-
-1. Hochauflösendes Foto (eigenes oder CC)
-2. Exportiere:
-   - PNG
-   - JPEG Q100, Q85, Q50
-   - WebP (optional)
-3. Tool: **[Squoosh.app](https://squoosh.app)** (Google-Tool)
-4. Vergleiche: Dateigrößen, sichtbare Unterschiede
-5. Wo werden Artefakte sichtbar?
-
-<!-- 
-Squoosh.app: Browser-basiert, keine Installation
-Side-by-Side-Vergleich mit Zoom
-Verschiedene Codecs testen
-Studis sollen selbst "Sweet Spot" finden
--->
-
----
-
-<!-- _class: lead -->
-
-# Teil 2: Video
-## Kompression & Codecs
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/netflix-4k.png)
-
-<!-- 
-Netflix 4K-Streaming
-Unmöglich ohne moderne Codecs
--->
-
----
-
-# Das Problem: Videos sind RIIIIIIIESIG
-
-**1 Minute 4K-Video (3840×2160):**
-
-- 30 fps (Bilder/Sekunde)
-- Jedes Bild: 24,8 MB (unkomprimiert)
-
-**Rechnung:**
-30 × 24,8 MB = **744 MB/Sekunde**
-× 60 Sekunden = **44,6 GB/Minute**
-
-**2-Stunden-Film: 5,3 TB!**
-
-<!-- 
-4K = 3840×2160 Pixel = 8,3 Megapixel pro Frame
-30 fps = Standard, Kino = 24 fps, Gaming = 60+ fps
-Ohne Kompression: Unmöglich zu streamen oder speichern
--->
-
----
-
-# Container vs. Codec
-
-**Container = Die Box**
-Verpackt Video, Audio, Untertitel, Metadaten
-
-**Beispiele:** MP4, MKV, AVI, MOV
-
-**Codec = Kompressionsalgorithmus**
-Entscheidet, WIE Daten komprimiert werden
-
-**Video-Codecs:** H.264, H.265, VP9, AV1
-**Audio-Codecs:** AAC, MP3, Opus
-
-<!-- 
-Container ≠ Codec (häufiges Missverständnis!)
-MP4 ist KEIN Codec, sondern Container
-Schachtel-Analogie: Container = Karton, Codec = Inhalt
-Ein MP4 kann H.264, H.265 oder AV1 enthalten
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/container-codec-diagram.png)
-
-<!-- 
-Diagramm: Container mit verschiedenen Streams
-Video-Track (H.264)
-Audio-Track (AAC)
-Untertitel-Track (SRT)
-Metadaten (Titel, Künstler, etc.)
--->
-
----
-
-# Video-Kompression: Drei Prinzipien
-
-**1. Spatial Compression (Intra-Frame)**
-Jedes Bild einzeln (wie JPEG)
-→ I-Frames
-
-**2. Temporal Compression (Inter-Frame)**
-Nur Änderungen zwischen Bildern
-→ P-Frames, B-Frames
-
-**3. Motion Compensation**
-"Ball bewegt sich von A nach B"
-
-<!-- 
-Spatial: Innerhalb eines Bildes (JPEG-ähnlich)
-Temporal: Zwischen Bildern (zeitliche Redundanz)
-Motion Compensation: Intelligente Vorhersage
-→ 90%+ Effizienz durch temporale Kompression
--->
-
----
-
-# I-Frames, P-Frames, B-Frames
-
-**I-Frame (Intra):**
-Vollständiges Bild (wie JPEG)
-Groß, aber unabhängig
-
-**P-Frame (Predicted):**
-Referenziert vorherige Frames
-Viel kleiner
-
-**B-Frame (Bi-directional):**
-Referenziert vorherige UND zukünftige Frames
-Am effizientesten
-
-**GOP:** I - B - B - P - B - B - P - B - B - I
-
-<!-- 
-GOP = Group of Pictures (typisch 12-15 Frames)
-I-Frame: Alle 1-2 Sekunden nötig (für Seeking)
-P-Frame: "Pixel X bewegt sich 5px rechts"
-B-Frame: Komplex, aber beste Kompression
-Wenn du vorspulst: Sucht nach nächstem I-Frame
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg fit](./assets/ipb-compression-canon.jpg)
-
-<!--
-Visualisierung: I/P/B-Frame-Abhängigkeiten
-I-Frame = Vollbild (Keyframe), P/B-Frames speichern nur Unterschiede
-Quelle: https://www.canon.com.hk/cpx/en/technical/va_EOS_Movie_Compression_Options_All_I_and_IPB.html
--->
-
----
-
-# H.264: Der König
-
-**H.264 / AVC (2003)**
-
-**Warum dominant?**
-✓ Exzellente Kompression (100:1 möglich)
-✓ Hardware-Support (jedes Gerät seit ~2010)
-✓ YouTube, Netflix, Blu-ray – alles H.264
-
-**Features:**
-- Variable Block-Größen (16×16 bis 4×4)
-- Deblocking-Filter
-- CABAC-Coding
-
-<!-- 
-AVC = Advanced Video Coding
-MPEG-4 Part 10 = H.264 (gleicher Standard)
-Revolutionierte Video-Streaming
-Hardware-Decoder in CPUs/GPUs → Batterie-schonend
-CABAC = Context-Adaptive Binary Arithmetic Coding
--->
-
----
-
-# Das Patent-Problem
-
-**H.264 ist NICHT frei!**
-
-**MPEG-LA (Patent Pool):**
-- 2.000+ Patente von ~30 Unternehmen
-- Apple, Microsoft, Sony, Panasonic...
-
-**Lizenzgebühren:**
-- Hardware-Decoder: $0,20/Einheit
-- Content-Distribution: Kostenlos für "Internet Broadcast"
-
-**Problem:** Open-Source-Projekte in Grauzone
-
-<!-- 
-MPEG-LA = Licensing Authority
-Firefox weigerte sich lange, H.264 zu supporten (Patent-Gründe)
-Chromium musste extern linken
-Patent-Pool: Firmen teilen Patente, gemeinsame Lizenzierung
-"Free to View" Klausel: YouTube etc. kostenlos
--->
-
----
-
-# H.265 / HEVC
-
-**H.265 (2013):**
-50% bessere Kompression als H.264
-
-**ABER:** Patent-Desaster
-
-**Drei (!) konkurrierende Patent-Pools:**
-- MPEG-LA
-- HEVC Advance
-- Velos Media
-
-→ Viele bleiben bei H.264 oder suchen Alternativen
-
-<!-- 
-HEVC = High Efficiency Video Coding
-Technisch überlegen, aber juristisch Albtraum
-Apple nutzt HEVC (iPhone-Videos)
-Netflix zögert wegen Lizenzkosten
-Fragmentierung verzögert Adoption
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/youtube-vp9.png)
-
-<!-- 
-YouTube VP9-Logo
-Google's Patent-freie Alternative
--->
-
----
-
-# VP9: Googles Antwort
-
-**VP9 (2013):**
-Entwickelt von Google (On2-Akquisition)
-
-**Eigenschaften:**
-✓ Ähnlich H.265-Kompression
-✓ KOSTENLOS, patent-frei (laut Google)
-✓ YouTube nutzt VP9 für 4K
-
-**Nachteile:**
-❌ Hardware-Support langsam
-❌ Höherer CPU-Aufwand
-❌ Nicht universell wie H.264
-
-<!-- 
-On2 Technologies: Gekauft 2010 für $133M
-VP8 → VP9 → AV1 (Evolution)
-YouTube forciert VP9: 4K-Videos nur VP9/AV1
-Hardware-Decoder erst ab ~2016 (langsame Adoption)
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/av1-logo.png)
-
-<!-- 
-AV1-Logo
-Alliance for Open Media
--->
-
----
-
-# AV1: Die Open-Source-Revolution
-
-**AV1 (2018):**
-Alliance for Open Media: Google, Netflix, Amazon, Microsoft, Apple, Mozilla...
-
-**Ziel:** Patent-freier, moderner Codec
-
-**Features:**
-✓ 30% besser als H.265
-✓ Royalty-free, Open Source
-✓ 8K, HDR, hohe Frame-Rates
-
-**Stand 2025:**
-YouTube, Netflix nutzen AV1 für 4K/8K
-
-<!-- 
-AOM = Alliance for Open Media (2015 gegründet)
-Alle Big-Tech-Player vereint (historisch!)
-"Fuck you" an Patent-Mafia
-Problem: Encoding SEHR langsam (10-100x vs. H.264)
-Hardware-Encoder kommen (ab 2020er-GPUs)
--->
-
----
-
-# Adaptive Bitrate Streaming
-
-**Problem:** Internet-Geschwindigkeit variiert
-
-**Lösung:** Mehrere Qualitäten parallel
-
-**MPEG-DASH / HLS:**
-- 4K (20 Mbps)
-- 1080p (5 Mbps)
-- 720p (2,5 Mbps)
-- 480p (1 Mbps)
-- 240p (0,5 Mbps)
-
-Segmente: 2-10 Sekunden (Player wählt dynamisch)
-
-<!-- 
-DASH = Dynamic Adaptive Streaming over HTTP
-HLS = HTTP Live Streaming (Apple)
-Beide ähnlich, aber inkompatibel
-Manifest-Datei: Liste aller Qualitäten
-Player misst Bandbreite, wechselt live
-→ Warum Netflix plötzlich pixelig wird
--->
-
----
-
-<!-- _header: '' -->
-<!-- _footer: '' -->
-
-![bg](./assets/streaming-quality-switch.png)
-
-<!-- 
-Visualisierung: Qualitätswechsel während Playback
-Bandbreite schwankt → Player reagiert
--->
-
----
-
-# Container im Detail
-
-**MP4:** Standard für Web/Mobile, DRM-fähig (H.264, H.265, AV1)
-
-**MKV:** Open Source, beliebig viele Spuren (fast jeder Codec)
-
-**WebM:** Google/Web-optimiert (nur VP9/AV1 + Opus/Vorbis)
-
-<!-- 
-MP4 = MPEG-4 Part 14 (ISO-Standard)
-Matroska = Russisch: Matrjoschka (Puppen ineinander)
-WebM = Subset von Matroska (HTML5-Video)
-MKV vs. MP4: Offenheit vs. Kompatibilität
--->
-
----
-
-# Hands-On: Video analysieren
-
-**Aufgabe (40 Min):**
-
-**Tools:**
-- Desktop: FFmpeg, HandBrake, [MediaInfo](https://mediaarea.net/MediaInfoOnline)
-- Browser: [Squoosh.app](https://squoosh.app) (Bilder), [MediaInfo Online](https://mediaarea.net/MediaInfoOnline)
-- iOS/Android: MediaInfo App, VLC
-
-1. Download: CC-Video (Big Buck Bunny, ~1 Min)
-2. Analysiere: Container, Codec, Bitrate, Auflösung
-3. Konvertiere: H.264 vs. H.265 (gleiche Qualität)
-4. Vergleiche: Größen, Encoding-Zeit
-
-<!-- 
-Big Buck Bunny: Open-Source-Film (Blender Foundation)
-FFmpeg: Swiss Army Knife für Video
-HandBrake: GUI für FFmpeg (einfacher)
-MediaInfo: Detaillierte Datei-Analyse
-Encoding-Zeit: H.265 deutlich langsamer als H.264
--->
-
----
-
-<!-- _class: lead -->
-
-# Fragen & Diskussion
-
-**Kontakt:** mail@librete.ch
-**Folien:** Online verfügbar unter https://librete.ch/hdm/223015b
-
----
-
-# Lizenz & Attribution
-
-Diese Präsentation ist lizenziert unter **Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)**
-
-- Erlaubt Teilen & Anpassen mit Namensnennung
-- Adaptionen müssen unter gleicher Lizenz geteilt werden
-
-Vollständige Lizenz: https://creativecommons.org/licenses/by-sa/4.0/
-

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "HdM Slides - Marp presentation builder with tools";
+  description = "HdM Slides - Marp presentation builder";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -9,114 +9,19 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
-
-        # QR code generator script
-        qr-gen = pkgs.writeShellScriptBin "qr" ''
-          if [ -z "$1" ]; then
-            echo "Usage: qr <url> [output.png]"
-            echo ""
-            echo "Examples:"
-            echo "  qr https://example.com"
-            echo "  qr https://example.com my-qr.png"
-            echo "  qr 'https://librete.ch/hdm/223015b/' slides-qr.png"
-            exit 1
-          fi
-
-          URL="$1"
-          OUTPUT="''${2:-qr-code.png}"
-
-          ${pkgs.qrencode}/bin/qrencode -o "$OUTPUT" -s 10 -m 2 "$URL"
-          echo "Generated: $OUTPUT"
-        '';
-
-        # QR code for course slides
-        qr-slides = pkgs.writeShellScriptBin "qr-slides" ''
-          COURSE="''${1:-223015b}"
-          OUTPUT="''${2:-build/$COURSE/qr-$COURSE.png}"
-
-          mkdir -p "$(dirname "$OUTPUT")"
-          ${pkgs.qrencode}/bin/qrencode -o "$OUTPUT" -s 10 -m 2 "https://librete.ch/hdm/$COURSE/"
-          echo "Generated QR for $COURSE: $OUTPUT"
-        '';
-
-        # Image optimizer script
-        optimize-img = pkgs.writeShellScriptBin "optimize-img" ''
-          if [ -z "$1" ]; then
-            echo "Usage: optimize-img <image-or-directory> [max-width]"
-            echo ""
-            echo "Resizes images to max width (default: 1920px)"
-            exit 1
-          fi
-
-          TARGET="$1"
-          MAX_WIDTH="''${2:-1920}"
-
-          if [ -d "$TARGET" ]; then
-            for img in "$TARGET"/*.{png,jpg,jpeg,webp} 2>/dev/null; do
-              [ -f "$img" ] || continue
-              echo "Optimizing: $(basename "$img")"
-              ${pkgs.imagemagick}/bin/magick "$img" -resize "''${MAX_WIDTH}x>" -quality 85 "$img"
-            done
-          elif [ -f "$TARGET" ]; then
-            echo "Optimizing: $TARGET"
-            ${pkgs.imagemagick}/bin/magick "$TARGET" -resize "''${MAX_WIDTH}x>" -quality 85 "$TARGET"
-          else
-            echo "Error: $TARGET not found"
-            exit 1
-          fi
-          echo "Done!"
-        '';
-
+        pkgs = import nixpkgs { inherit system; };
       in {
-        # Development shell with all tools
         devShells.default = pkgs.mkShell {
           buildInputs = with pkgs; [
-            nodejs_20
+            nodejs_22
             nodePackages.npm
-            qrencode
-            imagemagick
             gnumake
           ];
 
           shellHook = ''
-            echo "HdM Slides Development Environment"
-            echo ""
-            echo "Available commands:"
-            echo "  make dev-b     - Start 223015b dev server (port 1312)"
-            echo "  make dev-c     - Start 223015c dev server (port 1313)"
-            echo "  make build     - Build all courses"
-            echo "  qr <url>       - Generate QR code"
-            echo "  qr-slides 223015b - Generate QR for course"
-            echo "  optimize-img <dir> - Optimize images"
-            echo ""
+            echo "HdM Slides - run 'make' for available commands"
           '';
         };
-
-        # Standalone apps
-        packages = {
-          qr = qr-gen;
-          qr-slides = qr-slides;
-          optimize-img = optimize-img;
-          default = qr-gen;
-        };
-
-        # Direct runnable apps
-        apps = {
-          qr = {
-            type = "app";
-            program = "${qr-gen}/bin/qr";
-          };
-          qr-slides = {
-            type = "app";
-            program = "${qr-slides}/bin/qr-slides";
-          };
-          optimize-img = {
-            type = "app";
-            program = "${optimize-img}/bin/optimize-img";
-          };
-          default = self.apps.${system}.qr;
-        };
       }
     );
 }

marp.config.js

@@ -0,0 +1,21 @@
+const { Marp } = require('@marp-team/marp-core');
+const hljs = require('highlight.js');
+
+module.exports = {
+  engine: (opts) => {
+    const marp = new Marp(opts);
+    const md = marp.markdown;
+    const defaultInline = md.renderer.rules.code_inline
+      || ((tokens, idx, options, env, self) => `<code>${md.utils.escapeHtml(tokens[idx].content)}</code>`);
+    md.renderer.rules.code_inline = (tokens, idx, options, env, self) => {
+      const content = tokens[idx].content;
+      try {
+        const highlighted = hljs.highlight(content, { language: 'html', ignoreIllegals: true }).value;
+        return `<code class="hljs language-html">${highlighted}</code>`;
+      } catch (e) {
+        return defaultInline(tokens, idx, options, env, self);
+      }
+    };
+    return marp;
+  }
+};

package.json

@@ -3,20 +3,28 @@
   "version": "1.0.0",
   "description": "HdM Stuttgart - Lecture Slides (Marp)",
   "scripts": {
-    "dev:b": "PORT=1312 marp --server --allow-local-files courses/223015b/slides/",
-    "dev:c": "PORT=1313 marp --server --allow-local-files courses/223015c/slides/",
+    "dev": "PORT=3000 marp --server --allow-local-files slides/",
     "build": "make build",
     "build:b": "make build-b",
     "build:c": "make build-c",
     "pdf": "make pdf",
     "html": "make html",
+    "klausur": "make klausur",
+    "deploy": "make deploy",
     "test": "echo \"No tests specified\" && exit 0"
   },
-  "keywords": ["marp", "slides", "hdm", "lectures"],
+  "keywords": [
+    "marp",
+    "slides",
+    "hdm",
+    "lectures"
+  ],
   "author": "Michael Czechowski <mail@librete.ch>",
   "license": "CC-BY-SA-4.0",
   "type": "commonjs",
   "devDependencies": {
-    "@marp-team/marp-cli": "^4.2.3"
+    "@marp-team/marp-cli": "^4.2.3",
+    "@marp-team/marp-core": "^4.3.0",
+    "highlight.js": "^11.11.1"
   }
 }

scripts/dev-server.sh

@@ -1,106 +1,44 @@
 #!/usr/bin/env bash
-# Development server script for HdM slides
-# Starts index server + marp servers for each course
+# Development server for HdM slides
+# Usage:
+#   ./dev-server.sh              - Marp live server for all courses (port 1312)
+#   ./dev-server.sh 223015b 1313 - Marp live server for single course
+#   ./dev-server.sh 223015c 1314 - Marp live server for single course
 
 set -e
 
 # Configuration
-INDEX_PORT=1310
-COURSE_B_PORT=1311
-COURSE_C_PORT=1312
-COURSE_DIR="courses"
-DEV_INDEX_DIR=".dev-index"
+SLIDES_DIR="slides"
+COURSE="${1:-}"
+DEV_PORT="${2:-1312}"
 
 # Colors
-RED='\033[0;31m'
 GREEN='\033[0;32m'
 BLUE='\033[0;34m'
+RED='\033[0;31m'
 NC='\033[0m' # No Color
 
-# Cleanup function
-cleanup() {
-    echo -e "\n${RED}Shutting down servers...${NC}"
-    kill $PID_INDEX $PID_B $PID_C 2>/dev/null || true
-    exit 0
-}
-
-# Kill existing processes on our ports
-kill_existing() {
-    echo -e "${BLUE}Cleaning up existing processes...${NC}"
-    # Kill marp processes first
-    pkill -9 -f "marp-cli" 2>/dev/null || true
-    pkill -f "python3 -m http.server" 2>/dev/null || true
-    # Kill ports including marp's WebSocket ports (37717-37720 range)
-    fuser -k $INDEX_PORT/tcp $COURSE_B_PORT/tcp $COURSE_C_PORT/tcp 2>/dev/null || true
-    fuser -k 37717/tcp 37718/tcp 37719/tcp 37720/tcp 2>/dev/null || true
-    sleep 2
-}
-
-# Generate dev index
-generate_index() {
-    mkdir -p "$DEV_INDEX_DIR"
-    cat > "$DEV_INDEX_DIR/index.html" << 'EOF'
-<!DOCTYPE html>
-<html lang="de">
-<head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width,initial-scale=1">
-  <title>HdM Slides - Dev</title>
-  <style>
-    *{box-sizing:border-box;margin:0;padding:0}
-    body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,sans-serif;max-width:720px;margin:0 auto;padding:3rem 1.5rem;background:#fafafa;color:#1d1d1f;line-height:1.5}
-    h1{font-size:2rem;font-weight:600;letter-spacing:-0.02em;margin-bottom:.5rem}
-    .subtitle{color:#86868b;font-size:1rem}
-    .courses{margin-top:2rem;display:flex;flex-direction:column;gap:.75rem}
-    a.course{display:block;background:#fff;border-radius:12px;padding:1.5rem;text-decoration:none;color:inherit;box-shadow:0 1px 3px rgba(0,0,0,0.08);transition:all .2s ease;cursor:pointer}
-    a.course:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.12)}
-    .course-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
-    .course-b .course-label{color:#5da9e9}
-    .course-c .course-label{color:#d63384}
-    .course-title{font-size:1.15rem;font-weight:500;color:#1d1d1f;margin:.25rem 0}
-    .course-info{font-size:.85rem;color:#86868b}
-  </style>
-</head>
-<body>
-  <h1>HdM Slides</h1>
-  <p class="subtitle">Development Server</p>
-  <div class="courses">
-EOF
-    echo "    <a class=\"course course-b\" href=\"http://localhost:$COURSE_B_PORT\"><span class=\"course-label\">223015b</span><div class=\"course-title\">Dateiformate, Schnittstellen, Speichermedien & Distributionswege</div><span class=\"course-info\">Port $COURSE_B_PORT</span></a>" >> "$DEV_INDEX_DIR/index.html"
-    echo "    <a class=\"course course-c\" href=\"http://localhost:$COURSE_C_PORT\"><span class=\"course-label\">223015c</span><div class=\"course-title\">Grundlagen IT- und Internettechnik</div><span class=\"course-info\">Port $COURSE_C_PORT</span></a>" >> "$DEV_INDEX_DIR/index.html"
-    cat >> "$DEV_INDEX_DIR/index.html" << 'EOF'
-  </div>
-</body>
-</html>
-EOF
+# Kill existing process on our port only
+kill_port() {
+    fuser -k "$DEV_PORT/tcp" 2>/dev/null || true
+    sleep 0.5
 }
 
 # Main
-trap cleanup SIGINT SIGTERM
+trap 'echo -e "\n${RED}Shutting down...${NC}"; kill 0; exit 0' SIGINT SIGTERM
 
-kill_existing
-generate_index
+kill_port
 
-echo -e "${GREEN}Starting development servers...${NC}"
-echo ""
-echo -e "  Index:    ${BLUE}http://localhost:$INDEX_PORT${NC}"
-echo -e "  223015b:  ${BLUE}http://localhost:$COURSE_B_PORT${NC}"
-echo -e "  223015c:  ${BLUE}http://localhost:$COURSE_C_PORT${NC}"
-echo ""
-echo -e "Press ${RED}Ctrl+C${NC} to stop all servers"
+if [ -n "$COURSE" ]; then
+    SERVE_DIR="$SLIDES_DIR/$COURSE"
+    echo -e "${GREEN}Marp dev server${NC} · ${BLUE}$COURSE${NC}"
+else
+    SERVE_DIR="$SLIDES_DIR"
+    echo -e "${GREEN}Marp dev server${NC} · ${BLUE}all courses${NC}"
+fi
+
+echo -e "  ${BLUE}http://localhost:$DEV_PORT${NC}"
+echo -e "  ${BLUE}$SERVE_DIR/${NC}"
 echo ""
 
-# Start servers
-python3 -m http.server $INDEX_PORT --directory "$DEV_INDEX_DIR" &
-PID_INDEX=$!
-
-PORT=$COURSE_B_PORT npx @marp-team/marp-cli --server "$COURSE_DIR/223015b/slides/" &
-PID_B=$!
-
-sleep 3  # Stagger starts to avoid WebSocket port collision
-
-PORT=$COURSE_C_PORT npx @marp-team/marp-cli --server "$COURSE_DIR/223015c/slides/" &
-PID_C=$!
-
-# Wait for any process to exit
-wait
+PORT=$DEV_PORT exec npx @marp-team/marp-cli -c marp.config.js --server "$SERVE_DIR/"

scripts/extract-klausur.sh

@@ -0,0 +1,112 @@
+#!/usr/bin/env bash
+# Extract klausur-relevant slides from all kapitel
+# Usage: ./extract-klausur.sh <course_id>
+# Output: slides/<course>/klausurfolien.md
+
+set -e
+
+COURSE="${1:-223015b}"
+SLIDES_DIR="slides/$COURSE"
+OUTPUT_FILE="$SLIDES_DIR/klausurfolien.md"
+
+# Find the first kapitel file (00-intro.md or 01-*.md) to copy styles from
+FIRST_KAPITEL=$(ls "$SLIDES_DIR"/00-intro.md "$SLIDES_DIR"/01-*.md 2>/dev/null | head -1)
+
+if [[ -z "$FIRST_KAPITEL" ]]; then
+  echo "Error: No 00-intro.md or 01-*.md file found in $SLIDES_DIR"
+  exit 1
+fi
+
+echo "Extracting klausur slides for $COURSE..."
+
+# Extract frontmatter and styles (everything up to first <!-- _class: line after style block)
+# This gets the YAML frontmatter + <style> block
+awk '
+  BEGIN { in_frontmatter = 0; in_style = 0; done = 0 }
+  /^---$/ && !in_frontmatter { in_frontmatter = 1; print; next }
+  /^---$/ && in_frontmatter && !in_style { in_frontmatter = 0; print; next }
+  in_frontmatter { print; next }
+  /<style>/ { in_style = 1; print; next }
+  /<\/style>/ { in_style = 0; print; print ""; done = 1; next }
+  in_style { print; next }
+  done { exit }
+' "$FIRST_KAPITEL" > "$OUTPUT_FILE"
+
+# Add warning comment
+cat >> "$OUTPUT_FILE" << 'EOF'
+<!--
+  ╔═══════════════════════════════════════════════════════════════════╗
+  ║  AUTO-GENERATED FILE - DO NOT EDIT MANUALLY                       ║
+  ║                                                                   ║
+  ║  This file is generated by: make klausur                          ║
+  ║  Source: scripts/extract-klausur.sh                               ║
+  ║                                                                   ║
+  ║  To update, edit the source slides and re-run make klausur        ║
+  ╚═══════════════════════════════════════════════════════════════════╝
+-->
+
+EOF
+
+# Extract and copy the cover slide (first slide after frontmatter/styles, up to first ---)
+awk '
+  BEGIN { past_style = 0; in_cover = 0; printed = 0 }
+  /<\/style>/ { past_style = 1; next }
+  past_style && !in_cover && /^[^[:space:]]/ { in_cover = 1 }
+  in_cover && /^---$/ { print "---\n"; exit }
+  in_cover { print }
+' "$FIRST_KAPITEL" >> "$OUTPUT_FILE"
+
+# Process each kapitel file in order - extract klausur slides only
+for md_file in $(ls "$SLIDES_DIR"/[0-9][0-9]-*.md 2>/dev/null | grep -v klausurfolien | sort); do
+  filename=$(basename "$md_file")
+  kapitel_num=$(echo "$filename" | grep -oE '^[0-9]+' | sed 's/^0*//')
+
+  # Skip intro (kapitel 0)
+  if [[ "$kapitel_num" == "0" ]] || [[ -z "$kapitel_num" ]]; then
+    continue
+  fi
+
+  # Check if file has any klausur slides
+  if ! grep -q '<!-- _class: klausur -->' "$md_file"; then
+    continue
+  fi
+
+  echo "  Processing Kapitel $kapitel_num..."
+
+  # Extract klausur slides, hide header/footer, convert * to - bullets
+  awk '
+    /<!-- _class: klausur -->/ {
+      in_klausur = 1
+      # Add header/footer hiding
+      print "<!-- _header: \"\" -->"
+      print "<!-- _footer: \"\" -->"
+      print ""
+      next
+    }
+    in_klausur && /^---$/ {
+      print "\n---\n"
+      in_klausur = 0
+      next
+    }
+    in_klausur {
+      # Skip marp directives (we add our own)
+      if (/<!-- _header:/ || /<!-- _footer:/ || /<!-- _backgroundColor:/) next
+      # Convert * bullets to - bullets (avoid fragments)
+      gsub(/^\* /, "- ")
+      gsub(/^  \* /, "  - ")
+      gsub(/^    \* /, "    - ")
+      print
+    }
+  ' "$md_file" >> "$OUTPUT_FILE"
+
+done
+
+# Remove trailing --- and empty lines
+perl -i -0777 -pe 's/\n*---\n*$/\n/' "$OUTPUT_FILE"
+
+# Count slides
+slide_count=$(grep -c '^---$' "$OUTPUT_FILE" 2>/dev/null || echo "0")
+
+echo ""
+echo "Generated: $OUTPUT_FILE"
+echo "Total slides: $slide_count"

scripts/generate-index.sh

@@ -11,7 +11,7 @@ case "$COURSE" in
     TITLE="Dateiformate, Schnittstellen, Speichermedien & Distributionswege"
     SUBTITLE="223015b · Modul \"Technik 1\" · 1. Semester"
     SLIDES_URL="https://librete.ch/hdm/223015b"
-    ACCENT_COLOR="#5da9e9"
+    ACCENT_COLOR="#1e5f8a"
     ACCENT_LIGHT="#e8f4fc"
     ;;
   223015c)
@@ -42,6 +42,15 @@ TOPIC_MAP["geschichte-grundlagen-html"]="Geschichte, Grundlagen & HTML"
 TOPIC_MAP["netzwerke-protokolle-css"]="Netzwerke, Protokolle & CSS"
 TOPIC_MAP["interaktivitaet-javascript"]="Interaktivität & JavaScript"
 
+# Configure which topics should appear disabled per course
+# Two modes: fully disabled (non-clickable card) and buttons-disabled (link remains clickable, buttons are disabled)
+declare -A DISABLED_FULL
+declare -A DISABLED_BUTTONS
+# For course B: chapters 3,4,5 should be fully disabled
+DISABLED_FULL["223015b"]="speichermedien-schnittstellen distribution-apis-zukunft vertiefung-offene-fragen"
+# For course C: chapter 3 should keep link clickable but buttons disabled
+DISABLED_BUTTONS["223015c"]="interaktivitaet-javascript"
+
 cat > "$BUILD_DIR/index.html" << HEADER
 <!DOCTYPE html>
 <html lang="de">
@@ -61,6 +70,15 @@ cat > "$BUILD_DIR/index.html" << HEADER
       line-height: 1.5;
     }
     header { margin-bottom: 2rem; }
+    .breadcrumb {
+      margin-bottom: 1rem;
+      font-size: 0.85rem;
+    }
+    .breadcrumb a {
+      color: #86868b;
+      text-decoration: none;
+    }
+    .breadcrumb a:hover { text-decoration: underline; }
     h1 {
       font-size: 1.75rem;
       font-weight: 600;
@@ -68,6 +86,12 @@ cat > "$BUILD_DIR/index.html" << HEADER
       margin-bottom: 0.5rem;
       color: $ACCENT_COLOR;
     }
+    .course-heading {
+      font-size: 1.25rem;
+      font-weight: 500;
+      color: #1d1d1f;
+      margin-bottom: 0.25rem;
+    }
     .subtitle {
       color: #86868b;
       font-size: 0.95rem;
@@ -77,13 +101,14 @@ cat > "$BUILD_DIR/index.html" << HEADER
       font-size: 0.875rem;
       margin-top: 0.25rem;
     }
+    /* Use the .termine wrapper and add a gap between cards */
     .termine {
       margin-top: 1.5rem;
       display: flex;
       flex-direction: column;
       gap: 0.75rem;
     }
-    .termin-card {
+    .kapitel-card {
       position: relative;
       background: #fff;
       border-radius: 12px;
@@ -93,32 +118,35 @@ cat > "$BUILD_DIR/index.html" << HEADER
       grid-template-columns: 1fr auto auto;
       align-items: center;
       gap: 1rem;
+      padding: 0; /* inner padding handled by kapitel-link */
     }
-    .termin-card:hover {
+    .kapitel-card:hover {
       transform: translateY(-2px);
       box-shadow: 0 4px 12px rgba(0,0,0,0.12);
     }
-    .termin-link {
+    .kapitel-link {
       display: block;
       padding: 1.25rem 1.5rem;
       text-decoration: none;
       color: inherit;
       grid-column: 1;
     }
-    .termin-label {
+    /* Disabled look: dim the entire card and prevent pointer events */
+    .kapitel-card.disabled { opacity: 0.6; pointer-events: none; }
+    .kapitel-label {
       font-size: 0.7rem;
       font-weight: 600;
       color: $ACCENT_COLOR;
       text-transform: uppercase;
       letter-spacing: 0.05em;
     }
-    .termin-title {
+    .kapitel-title {
       font-size: 1.05rem;
       font-weight: 500;
       color: #1d1d1f;
       margin: 0.15rem 0;
     }
-    .termin-date {
+    .kapitel-date {
       font-size: 0.8rem;
       color: #86868b;
     }
@@ -135,11 +163,11 @@ cat > "$BUILD_DIR/index.html" << HEADER
       white-space: nowrap;
       position: relative;
       z-index: 1;
+      margin-right: 0.5rem;
     }
     .btn-slides {
       background: $ACCENT_COLOR;
       color: #fff;
-      margin-right: 0.5rem;
     }
     .btn-slides:hover {
       filter: brightness(1.1);
@@ -147,11 +175,11 @@ cat > "$BUILD_DIR/index.html" << HEADER
     .btn-pdf {
       background: #f5f5f7;
       color: #1d1d1f;
-      margin-right: 1rem;
     }
     .btn-pdf:hover { background: #e8e8ed; }
+    .btn-disabled { opacity: 0.6; pointer-events: none; }
     /* Make entire card clickable via overlay */
-    .termin-link::after {
+    .kapitel-link::after {
       content: '';
       position: absolute;
       inset: 0;
@@ -166,11 +194,28 @@ cat > "$BUILD_DIR/index.html" << HEADER
     }
     footer a { color: $ACCENT_COLOR; text-decoration: none; }
     footer a:hover { text-decoration: underline; }
+    .qr-section {
+      margin-top: 2.5rem;
+      padding: 1.5rem;
+      background: #fff;
+      border-radius: 12px;
+      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
+      text-align: center;
+    }
+    .qr-code {
+      width: 100%;
+      height: auto;
+    }
+    .qr-url {
+      margin-top: 0.75rem;
+      font-size: 0.85rem;
+      color: #86868b;
+    }
     @media (max-width: 600px) {
-      .termin-card {
+      .kapitel-card {
         grid-template-columns: 1fr;
       }
-      .termin-link {
+      .kapitel-link {
         padding-bottom: 0.75rem;
       }
       .btn-slides, .btn-pdf {
@@ -181,68 +226,149 @@ cat > "$BUILD_DIR/index.html" << HEADER
 </head>
 <body>
   <header>
-    <h1>$TITLE</h1>
+    <p class="breadcrumb"><a href="../">← Kursübersicht</a></p>
+    <h1>HdM Vorlesungen</h1>
+    <h2 class="course-heading">$TITLE</h2>
     <p class="subtitle">$SUBTITLE</p>
-    <p class="meta">HdM Stuttgart · Wintersemester 2025/26 · Michael Czechowski</p>
+    <p class="meta">HdM Stuttgart · Sommersemester 2026 · Michael Czechowski</p>
   </header>
   <div class="termine">
 HEADER
 
-# Generate links for each termin (sorted)
-for html in $(ls "$BUILD_DIR"/2*.html 2>/dev/null | sort); do
+# Generate links for each kapitel (sorted)
+for html in $(ls "$BUILD_DIR"/[0-9][0-9]-*.html 2>/dev/null | sort); do
   filename=$(basename "$html")
 
-  # Extract components from filename
-  date=$(echo "$filename" | grep -oE '^[0-9]{4}-[0-9x]{2}-[0-9x]{2}')
-  termin_num=$(echo "$filename" | grep -oE 'termin-[0-9]+' | grep -oE '[0-9]+')
-  topic_raw=$(echo "$filename" | sed -E 's/^[0-9]{4}-[0-9x]{2}-[0-9x]{2}-termin-[0-9]+-//' | sed 's/\.html$//')
+  # Extract components from filename (format: NN-topic.html)
+  kapitel_num=$(echo "$filename" | grep -oE '^[0-9]+' | sed 's/^0*//')
+  topic_raw=$(echo "$filename" | sed -E 's/^[0-9]+-//' | sed 's/\.html$//')
 
   # Look up nice topic name or fallback
   topic="${TOPIC_MAP[$topic_raw]}"
   if [[ -z "$topic" ]]; then
-    topic=$(echo "$topic_raw" | sed 's/-/ /g' | sed 's/.*/\u&/')
+    topic=$(echo "$topic_raw" | sed 's/-/ /g' | sed 's/.*/\\u&/')
   fi
 
-  # Format date
-  if [[ "$date" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]] && [[ ! "$date" =~ xx ]]; then
-    formatted_date=$(date -d "$date" "+%d. %B %Y" 2>/dev/null || echo "$date")
+  # Handle kapitel number
+  if [[ "$kapitel_num" == "0" ]] || [[ -z "$kapitel_num" ]]; then
+    kapitel_label="Einführung"
   else
-    formatted_date="Termin folgt"
-  fi
-
-  # Handle termin number
-  if [[ "$termin_num" == "0" ]]; then
-    termin_label="Einführung"
-  else
-    termin_label="Termin $termin_num"
+    kapitel_label="Kapitel $kapitel_num"
   fi
 
   pdf_filename="${filename%.html}.pdf"
 
-  # Check if PDF exists
+  # Determine whether this topic is configured as disabled for this course
+  disabled_full=false
+  disabled_buttons=false
+  for t in ${DISABLED_FULL["$COURSE"]}; do
+    if [[ "$topic_raw" == "$t" ]]; then
+      disabled_full=true
+      break
+    fi
+  done
+  if [[ "$disabled_full" == false ]]; then
+    for t in ${DISABLED_BUTTONS["$COURSE"]}; do
+      if [[ "$topic_raw" == "$t" ]]; then
+        disabled_buttons=true
+        break
+      fi
+    done
+  fi
+
+  # Decide card class
+  card_class="kapitel-card"
+  if [[ "$disabled_full" == true ]] || [[ "$disabled_buttons" == true ]]; then
+    card_class="$card_class disabled"
+  fi
+
+  # Build link/button HTML depending on disabled state
+  if [[ "$disabled_full" == true ]]; then
+    # non-interactive card (visually dimmed and not clickable)
+    link_html="<div class=\"kapitel-link\"><div class=\"kapitel-label\">$kapitel_label</div><div class=\"kapitel-title\">$topic</div></div>"
+    slides_html="<span class=\"btn btn-slides btn-disabled\">Folien</span>"
+    pdf_html=""
+    if [[ -f "$BUILD_DIR/$pdf_filename" ]]; then
+      pdf_html="<span class=\"btn btn-pdf btn-disabled\">PDF</span>"
+    fi
+  elif [[ "$disabled_buttons" == true ]]; then
+    # link stays clickable, but buttons are disabled; card appears dimmed
+    link_html="<a href=\"$filename\" class=\"kapitel-link\"><div class=\"kapitel-label\">$kapitel_label</div><div class=\"kapitel-title\">$topic</div></a>"
+    slides_html="<span class=\"btn btn-slides btn-disabled\">Folien</span>"
+    pdf_html=""
+    if [[ -f "$BUILD_DIR/$pdf_filename" ]]; then
+      pdf_html="<span class=\"btn btn-pdf btn-disabled\">PDF</span>"
+    fi
+  else
+    # normal interactive card
     pdf_link=""
     if [[ -f "$BUILD_DIR/$pdf_filename" ]]; then
       pdf_link="<a href=\"$pdf_filename\" class=\"btn btn-pdf\">PDF</a>"
     fi
+    link_html="<a href=\"$filename\" class=\"kapitel-link\"><div class=\"kapitel-label\">$kapitel_label</div><div class=\"kapitel-title\">$topic</div></a>"
+    slides_html="<a href=\"$filename\" class=\"btn btn-slides\">Folien</a>"
+    pdf_html="$pdf_link"
+  fi
 
   cat >> "$BUILD_DIR/index.html" << LINK
-    <div class="termin-card">
-      <a href="$filename" class="termin-link">
-        <div class="termin-label">$termin_label</div>
-        <div class="termin-title">$topic</div>
-        <div class="termin-date">$formatted_date</div>
-      </a>
-      <a href="$filename" class="btn btn-slides">Folien</a>
-      $pdf_link
+    <div class="$card_class">
+      $link_html
+      $slides_html
+      $pdf_html
     </div>
 LINK
+
 done
 
+# Add klausurfolien entry if it exists (disabled — wird noch überarbeitet)
+if [[ -f "$BUILD_DIR/klausurfolien.html" ]]; then
+  pdf_disabled=""
+  if [[ -f "$BUILD_DIR/klausurfolien.pdf" ]]; then
+    pdf_disabled="<span class=\"btn btn-pdf btn-disabled\">PDF</span>"
+  fi
+  cat >> "$BUILD_DIR/index.html" << KLAUSUR
+    <div class="kapitel-card disabled" style="border-left: 3px solid $ACCENT_COLOR;">
+      <div class="kapitel-link">
+        <div class="kapitel-label">Prüfung</div>
+        <div class="kapitel-title">Klausurrelevante Folien</div>
+      </div>
+      <span class="btn btn-slides btn-disabled">Folien</span>
+      $pdf_disabled
+    </div>
+KLAUSUR
+fi
+
+# Add klausurfragen entry if it exists (disabled — wird noch überarbeitet)
+if [[ -f "$BUILD_DIR/klausurfragen.html" ]] || [[ -f "$BUILD_DIR/klausurfragen.pdf" ]]; then
+  pdf_disabled=""
+  if [[ -f "$BUILD_DIR/klausurfragen.pdf" ]]; then
+    pdf_disabled="<span class=\"btn btn-pdf btn-disabled\">PDF</span>"
+  fi
+  slides_disabled=""
+  if [[ -f "$BUILD_DIR/klausurfragen.html" ]]; then
+    slides_disabled="<span class=\"btn btn-slides btn-disabled\">Folien</span>"
+  fi
+  cat >> "$BUILD_DIR/index.html" << KLAUSURFRAGEN
+    <div class="kapitel-card disabled" style="border-left: 3px solid $ACCENT_COLOR;">
+      <div class="kapitel-link">
+        <div class="kapitel-label">Prüfung</div>
+        <div class="kapitel-title">Klausurfragen</div>
+      </div>
+      $slides_disabled
+      $pdf_disabled
+    </div>
+KLAUSURFRAGEN
+fi
+
 cat >> "$BUILD_DIR/index.html" << FOOTER
   </div>
+  <div class="qr-section">
+    <img src="qr-index.svg" alt="QR Code" class="qr-code">
+    <p class="qr-url">$SLIDES_URL</p>
+  </div>
   <footer>
     <a href="mailto:mail@librete.ch">Kontakt</a> ·
-    <a href="../">Alle Kurse</a>
+    <a href="../">Kursübersicht</a>
   </footer>
 </body>
 </html>

scripts/generate-root-index.sh

@@ -0,0 +1,158 @@
+#!/usr/bin/env bash
+# Generate root index.html for HdM slides overview
+# Usage: ./generate-root-index.sh
+
+BUILD_DIR="${1:-build}"
+
+cat > "$BUILD_DIR/index.html" << 'HEADER'
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>HdM Vorlesungen</title>
+  <style>
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
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+      font-weight: 600;
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+      font-weight: 600;
+      color: #86868b;
+      margin-top: 2.5rem;
+      margin-bottom: 0.75rem;
+    }
+    .references {
+      display: flex;
+      flex-direction: column;
+      gap: 0.75rem;
+    }
+    footer {
+      margin-top: 2.5rem;
+      padding-top: 1.5rem;
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+    }
+    footer a { color: #1d1d1f; text-decoration: none; }
+    footer a:hover { text-decoration: underline; }
+    .qr-section {
+      margin-top: 2.5rem;
+      padding: 1.5rem;
+      background: #fff;
+      border-radius: 12px;
+      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
+      text-align: center;
+    }
+    .qr-code { width: 100%; height: auto; }
+    .qr-url { margin-top: 0.75rem; font-size: 0.85rem; color: #86868b; }
+    @media (max-width: 600px) {
+      .course-card { grid-template-columns: 1fr; }
+      .course-link { padding-bottom: 0.75rem; }
+    }
+  </style>
+</head>
+<body>
+  <h1>HdM Vorlesungen</h1>
+  <p class="subtitle">Sommersemester 2026 · Michael Czechowski</p>
+  <div class="courses">
+    <div class="course-card course-b">
+      <a href="223015b/" class="course-link">
+        <span class="course-label">223015b</span>
+        <div class="course-title">Dateiformate, Schnittstellen, Speichermedien &amp; Distributionswege</div>
+        <span class="course-info">6 Kapitel · Modul &quot;Technik 1&quot;</span>
+      </a>
+    </div>
+    <div class="course-card course-c">
+      <a href="223015c/" class="course-link">
+        <span class="course-label">223015c</span>
+        <div class="course-title">Grundlagen IT- und Internettechnik</div>
+        <span class="course-info">3 Kapitel · Modul &quot;Technik 1&quot;</span>
+      </a>
+    </div>
+  </div>
+  <h2 class="section-title">Referenzen</h2>
+  <div class="references">
+    <div class="course-card">
+      <a href="https://codecrispi.es/" class="course-link">
+        <span class="course-label">Plattform</span>
+        <div class="course-title">Code Crispies</div>
+        <span class="course-info">Selbstlernplattform</span>
+      </a>
+    </div>
+  </div>
+  <div class="qr-section">
+    <img src="qr-root.svg" alt="QR Code" class="qr-code">
+    <p class="qr-url">https://librete.ch/hdm/</p>
+  </div>
+  <footer>
+    <a href="mailto:mail@librete.ch">Kontakt</a>
+  </footer>
+</body>
+</html>
+HEADER
+
+echo "Generated $BUILD_DIR/index.html"

slides/223015b/00-intro.md

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+header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
+title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
+---
+
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+
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+<!-- _header: '' -->
+<!-- _backgroundColor: #000 -->
+
+![bg cover opacity:0.2](./assets/radek-grzybowski-eBRTYyjwpRY-unsplash.jpg)
+
+# Dateiformate, Schnittstellen, Speichermedien & Distributionswege
+
+**223015b** · Modul "Technik 1" · 1. Semester
+Digital- und Medienwirtschaft
+Hochschule der Medien Stuttgart
+
+**Sommersemester 2026**
+
+[https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/qrcode-0.svg)
+
+---
+
+<!-- _class: lead -->
+
+# Herzlich willkommen!
+## Einführung
+
+---
+
+# Über mich
+
+**Michael Werner Czechowski**
+
+- Systems and Platform Engineer
+- Schwerpunkte:
+  - Web-Technologien, Barriere-Armut, Systemarchitektur, Open Source
+- Hintergrund:
+  - Philosophie (Uni Stuttgart)
+  - Wirtschaftsinformatik (Leibniz-FH Hannover)
+- Kontakt: lb-czechowski@hdm-stuttgart.de
+
+---
+
+# Warum dieses Modul?
+
+**Digitale Medien sind überall.**
+
+* Warum enthalten Fotos oft Informationen über den Aufnahmeort?
+* Warum lassen sich gelöschte Dateien wiederherstellen?
+* Warum benötigt eine Minute 4K-Video unkomprimiert 45 GB Speicher?
+* Warum zeigt eine "1 TB"-Festplatte nur 931 GB an?
+* Warum ist USB-C nicht gleich USB-C?
+* Ziel: **→ Mitreden können!**
+
+<!--
+1. EXIF (Exchangeable Image File Format)-Metadaten speichern GPS-Koordinaten, Kameramodell und Zeitstempel automatisch. Die meisten wissen nicht, dass diese Daten beim Versenden mitgeschickt werden. → Kapitel 4: Metadaten
+
+2. Beim Löschen wird nur der Verzeichniseintrag im Dateisystem entfernt, nicht die Daten selbst. Die Bits bleiben auf dem Datenträger, bis sie überschrieben werden. → Kapitel 3: Dateisysteme
+
+3. 3840 × 2160 Pixel × 3 Byte (RGB) × 30 Bilder/Sek × 60 Sek = ~45 GB. Codecs wie H.264/H.265 komprimieren um Faktor 100+. → Kapitel 1+2: Kompression
+
+4. Hersteller rechnen dezimal (1 TB = 10¹² Bytes), Betriebssysteme binär (1 TiB = 2⁴⁰ Bytes). Die Differenz beträgt bei Terabyte bereits ~10%. → Kapitel 1: Dateneinheiten
+
+5. USB-C ist nur die Steckerform. Dahinter können USB 2.0 (480 Mbit/s), USB 3.2 (20 Gbit/s) oder Thunderbolt 4 (40 Gbit/s) laufen — gleiches Kabel, völlig unterschiedliche Leistung. → Kapitel 3: Schnittstellen
+-->
+
+---
+
+# Kurze Umfrage
+
+**Bitte Hand heben:**
+
+* Wer kennt den Unterschied zwischen analog und digital?
+* Wer hat schon mal eine Datei von einem Format in ein anderes konvertiert?
+* Wer hat schon mal Metadaten aus einem Foto entfernt?
+* Wer hat schon mal ein Backup verloren?
+* Wer hat schon mal ein Backup wiederhergestellt?
+
+<!--
+Niveau der Gruppe einschätzen
+Keine falschen Antworten
+Zeigt, wo wir starten
+API = Application Programming Interface
+-->
+
+---
+
+# Kursübersicht
+
+**Kapitel:**
+
+* 1. **Grundlagen**, Text & Audio (Bits, Bytes, Zeichenkodierung, MP3)
+* 2. Bild- & Video-**Kompression** (JPEG, PNG, H.264/H.265)
+* 3. **Speichermedien** & **Schnittstellen** (HDD, SSD, USB, Thunderbolt)
+* 4. **Distribution** und Verteilung (Streaming, REST, Cloud)
+* Vertiefung & offene Fragen
+
+
+---
+
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #e3f2fd -->
+
+# Prüfungsleistung
+
+**Nach aktuellem Kenntnisstand:**
+
+* 90 min insg. (Technik 1)
+* Schriftliche Klausur (digital)
+* Teils offene Fragen
+* Kein Coding/Programmieren
+* **Prüfungsrelevante Folien:**
+  - Gestreift oder Vollton (PDF) markiert

slides/223015b/03-speichermedien-schnittstellen.md

@@ -0,0 +1,850 @@
+---
+marp: true
+theme: gaia
+paginate: true
+backgroundColor: #fff
+header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
+title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
+---
+
+<style>
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+</style>
+
+<!-- _class: invert -->
+<!-- _header: '' -->
+<!-- _backgroundColor: #000 -->
+
+![bg cover opacity:0.2](./assets/radek-grzybowski-eBRTYyjwpRY-unsplash.jpg)
+
+# Dateiformate, Schnittstellen, Speichermedien & Distributionswege
+
+**223015b** · Modul "Technik 1" · 1. Semester
+Digital- und Medienwirtschaft
+Hochschule der Medien Stuttgart
+
+**Sommersemester 2026**
+
+[https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/qr/slides-223015b.png)
+
+---
+
+<!-- _class: lead -->
+
+# Kapitel 3 – 23.01.2026
+## Speichermedien & Schnittstellen
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg](./assets/hdd-ssd-comparison.png)
+
+<!--
+HDD aufgeschraubt neben SSD-Platine
+Mechanisch vs. Elektronisch
+-->
+
+---
+
+# Speicherkapazität: KB vs. KiB
+
+**Das Problem:** Hersteller vs. Betriebssysteme
+
+| Dezimal (SI) | Binär (IEC) |
+|--------------|-------------|
+| 1 KB = 1.000 Bytes | 1 KiB = 1.024 Bytes |
+| 1 MB = 1.000 KB | 1 MiB = 1.024 KiB |
+| 1 GB = 1.000 MB | 1 GiB = 1.024 MiB |
+| 1 TB = 1.000 GB | 1 TiB = 1.024 GiB |
+
+**1 TB Festplatte → Windows zeigt ~931 GB!**
+
+<!--
+Hersteller: Dezimal (SI-Präfix) - klingt mehr!
+Betriebssysteme: Binär - aber zeigen "GB" statt "GiB"
+Diskrepanz bei 1 TB: 1.000.000.000.000 vs. 1.099.511.627.776 Bytes
+→ 10% Unterschied bei TB-Größen
+Verwirrung für KonsumentInnen seit Jahrzehnten
+ISO/IEC 80000-13: Definiert KiB, MiB, GiB, TiB (2008)
+-->
+
+---
+
+# HDD: Aufbau & Struktur
+
+**Komponenten:**
+- **Platter:** Magnetisch beschichtete Scheiben
+- **Spindel:** Dreht mit 5.400-7.200 RPM
+- **Schreib-Lese-Kopf:** Schwebt nm-dünn über Platter
+- **Aktuator:** Bewegt Kopf zur richtigen Spur
+
+**Logische Struktur:**
+- **Spuren:** Konzentrische Kreise auf Platter
+- **Sektoren:** Unterteilung der Spuren (512 Bytes)
+- **Zylinder:** Gleiche Spuren aller Platter
+
+<!--
+Aufbau seit 1956 (IBM) grundsätzlich gleich
+Platter: Aluminium oder Glas mit Magnetschicht
+Spindelgeschwindigkeit: Desktop 7.200, Laptop 5.400, Server 15.000 RPM
+Head Crash: Schreib-Lese-Kopf berührt Platter → Kratzer → Datenverlust
+Sektor: Kleinste adressierbare Einheit
+LBA (Logical Block Addressing): Abstraktion der physischen Struktur
+-->
+
+---
+
+# NVMe: Die SSD-Revolution
+
+**NVMe = Non-Volatile Memory Express (2011)**
+
+**Unterschied zu SATA-SSD:**
+- SATA: Max. ~550 MB/s (AHCI-Protokoll)
+- NVMe: Bis zu 7.000+ MB/s (PCIe direkt)
+
+**Form-Faktoren:**
+2,5" (SATA), M.2 (SATA oder NVMe), PCIe-Karte
+
+<!--
+NVMe = Non-Volatile Memory Express
+Protokoll speziell für Flash-Speicher entwickelt.
+
+SATA wurde für HDDs entwickelt.
+Für SSDs ein Flaschenhals.
+
+M.2 ist ein Formfaktor, kein Protokoll!
+M.2 kann SATA oder NVMe sein – prüfen!
+-->
+
+---
+
+# HDD vs. SSD: Vergleich
+
+| Aspekt | HDD | SSD (NVMe) |
+|--------|----:|----------:|
+| Sequentiell | ~150 MB/s | ~3.500 MB/s |
+| Random Read | ~1 MB/s | ~500 MB/s |
+| Latenz | ~10 ms | ~0,02 ms |
+| Preis/TB | ~15€ | ~60€ |
+| Max. Kapazität | 24 TB | 8 TB (Consumer) |
+| Haltbarkeit | 3-5 Jahre | 5-10 Jahre |
+
+<!--
+Der Random-Access-Unterschied ist dramatisch.
+500× schneller bei zufälligen Zugriffen.
+
+Das ist der Grund, warum SSDs Betriebssysteme
+so viel schneller starten lassen.
+-->
+
+---
+
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #e3f2fd -->
+
+# Wann HDD, wann SSD?
+
+| Anwendung | Empfehlung |
+|-----------|------------|
+| Betriebssystem | SSD (NVMe) |
+| Anwendungen, Spiele | SSD |
+| Video-Editing (Projekte) | SSD |
+| Foto-Archiv | HDD oder SSD |
+| Backup | HDD |
+| NAS / Server | HDD (oder Mix) |
+| Cold Storage | HDD oder Band |
+
+<!--
+Die Faustregel:
+- Oft genutzt, schnell gebraucht → SSD
+- Selten genutzt, viel Kapazität → HDD
+
+Viele setzen auf beides:
+Kleine SSD für System + große HDD für Archiv.
+-->
+
+---
+
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# HDD vs. SSD – Vertiefung
+
+**HDD (Hard Disk Drive):** Magnetplatten rotieren mit 5.400–7.200 RPM; ein Schreib-/Lesekopf schwebt nanometerweit über der Oberfläche. Die Zugriffszeit setzt sich zusammen aus Seek Time (Kopf bewegen) + Rotational Latency (warten auf Sektor).
+
+**SSD (Solid State Drive):** NAND-Flash-Zellen speichern Bits als elektrische Ladung. Kein mechanischer Zugriff → konstant schnelle Latenz. Aber: Zellen haben begrenzte Schreibzyklen (P/E Cycles).
+
+| Aspekt | HDD | SATA SSD | NVMe SSD |
+|--------|-----|----------|----------|
+| Latenz | 5–10 ms | 0,1 ms | 0,02 ms |
+| Seq. Lesen | 150 MB/s | 550 MB/s | 7.000 MB/s |
+| IOPS (4K random) | 100 | 90.000 | 1.000.000 |
+| TBW (1 TB Modell) | ∞ | 600 TBW | 600 TBW |
+
+**Wear Leveling:** SSD-Controller verteilen Schreibvorgänge gleichmäßig, um einzelne Zellen nicht vorzeitig zu erschöpfen. TRIM informiert den Controller über gelöschte Blöcke.
+
+**Praxis:** System-SSD für OS/Anwendungen (Geschwindigkeit), HDD für Medienarchiv (Kapazität/Preis). RAID schützt vor Einzelausfällen bei beiden.
+
+---
+
+<!-- _class: lead -->
+
+# Dateisysteme
+## Die Organisation der Daten
+
+---
+
+# Was macht ein Dateisystem?
+
+**Aufgaben:**
+- Dateien in Blöcke aufteilen
+- Speicherort verwalten (Allokation)
+- Verzeichnisstruktur pflegen
+- Metadaten speichern (Name, Datum, Rechte)
+- Integrität sichern (Journaling)
+
+**Ohne Dateisystem:**
+Nur eine Folge von Bytes ohne Struktur.
+
+<!--
+Das Dateisystem ist die Abstraktionsschicht
+zwischen Anwendungen und rohem Speicher.
+
+Es entscheidet:
+- Wie Dateien gefunden werden
+- Wie freier Speicher verwaltet wird
+- Was bei Abstürzen passiert
+-->
+
+---
+
+# FAT32: Der Kompatibilitätskönig
+
+**File Allocation Table, 32-bit (1996)**
+
+**Vorteile:**
+- Überall lesbar (Windows, Mac, Linux, Kameras, Fernseher...)
+- Einfach, robust
+
+**Nachteile:**
+- Max. 4 GB pro Datei
+- Max. 2 TB pro Volume
+- Keine Berechtigungen
+- Kein Journaling
+
+**Ideal für:** USB-Sticks, SD-Karten (Kompatibilität)
+
+<!--
+4 GB Limit ist das Hauptproblem.
+Ein 4K-Video oder ISO-Image passt oft nicht drauf.
+
+Trotzdem: FAT32 ist der kleinste gemeinsame Nenner.
+Wenn Kompatibilität wichtiger ist als Features → FAT32.
+-->
+
+---
+
+# exFAT: FAT32 ohne Limits
+
+**Extended FAT (2006, Microsoft)**
+
+**Vorteile:**
+- Keine praktischen Dateigrößen-Limits
+- Breite Unterstützung (seit 2019 auch Linux-Kernel)
+- Für Flash-Speicher optimiert
+
+**Nachteile:**
+- Kein Journaling
+- Weniger robust als NTFS/APFS/ext4
+
+**Ideal für:** Große Dateien auf portablen Medien
+
+<!--
+exFAT ist der Nachfolger von FAT32 für portable Medien.
+SD-Karten über 32 GB sind standardmäßig exFAT.
+
+Microsoft hat 2019 die Patente freigegeben.
+Seitdem native Linux-Unterstützung.
+-->
+
+---
+
+# NTFS: Windows-Standard
+
+**New Technology File System (1993)**
+
+**Features:**
+- Journaling (Crash-Sicherheit)
+- Dateirechte (ACLs)
+- Kompression, Verschlüsselung
+- Große Dateien und Volumes
+
+**Nachteile:**
+- Nur Windows schreibt nativ
+- macOS: Nur lesen
+- Linux: Über ntfs-3g (langsamer)
+
+<!--
+NTFS ist seit Windows NT der Standard.
+Alle modernen Windows-Versionen nutzen es.
+
+Für Windows-only-Systeme die beste Wahl.
+Für portable Medien: Kompatibilitätsprobleme.
+-->
+
+---
+
+# APFS: Apple-Modern
+
+**Apple File System (2017)**
+
+**Features:**
+- Snapshots (Zeitpunkt-Kopien)
+- Copy-on-Write (CoW)
+- Native Verschlüsselung
+- Optimiert für SSDs
+
+**Nachteile:**
+- Nur Apple-Geräte
+- Nicht abwärtskompatibel mit HFS+
+
+<!--
+APFS ersetzte HFS+ auf allen Apple-Geräten.
+Snapshots ermöglichen Time Machine und APFS-Klone.
+
+Copy-on-Write: Daten werden nicht überschrieben,
+sondern neue Versionen werden geschrieben.
+Gut für Integrität und Snapshots.
+-->
+
+---
+
+# ext4: Linux-Standard
+
+**Fourth Extended File System (2008)**
+
+**Features:**
+- Journaling
+- Extents (effiziente große Dateien)
+- Online-Defragmentierung
+- Bewährt und stabil
+
+**Nachteile:**
+- Windows/macOS können nicht nativ lesen
+- Weniger Features als btrfs/ZFS
+
+<!--
+ext4 ist der Standard für Linux-Systeme.
+Evolution: ext (1992) → ext2 → ext3 → ext4
+
+Alternativen: btrfs (Snapshots, CoW), XFS, ZFS
+Für Server oft XFS oder ZFS.
+-->
+
+---
+
+# Dateisysteme: Übersicht
+
+| FS | Max. Datei | Journaling | Ideal für |
+|----|----------:|:----------:|-----------|
+| FAT32 | 4 GB | ❌ | Kompatibilität |
+| exFAT | 16 EB | ❌ | Große portable Dateien |
+| NTFS | 16 EB | ✓ | Windows |
+| APFS | 8 EB | ✓ | macOS, iOS |
+| ext4 | 16 TB | ✓ | Linux |
+
+<!--
+Die Wahl hängt vom Kontext ab.
+
+Portable Medien: FAT32 oder exFAT
+Interne Laufwerke: NTFS, APFS, ext4 je nach OS
+-->
+
+---
+
+<!-- _class: lead -->
+
+# Backup & Archivierung
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg](./assets/backup-disaster.png)
+
+<!--
+Symbolbild: Kaputte Festplatte oder Ransomware
+Das Worst-Case-Szenario
+-->
+
+---
+
+# Warum Backup?
+
+**Realitäten:**
+- HDDs haben 1-2% jährliche Ausfallrate
+- SSDs können ohne Vorwarnung sterben
+- Ransomware verschlüsselt Daten
+- Versehentliches Löschen passiert
+- Diebstahl, Brand, Wasserschaden
+
+**Die Frage ist nicht ob, sondern wann.**
+
+<!--
+Backblaze veröffentlicht jährliche HDD-Statistiken.
+1-2% Ausfallrate klingt wenig, aber bei 100 Platten...
+
+Pixar verlor fast "Toy Story 2" (1998).
+Rettung: Eine Mitarbeiterin hatte ein Home-Backup.
+-->
+
+---
+
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #e3f2fd -->
+
+# Die 3-2-1-Regel
+
+**3** Kopien eurer Daten
+(Original + 2 Backups)
+
+**2** verschiedene Medientypen
+(z.B. SSD + HDD, oder lokal + Cloud)
+
+**1** Kopie an anderem Ort
+(Offsite: Cloud, anderes Gebäude)
+
+<!--
+Herkunft: Peter Krogh, "The DAM Book" (2005)
+
+Warum 3 Kopien?
+- Original kann kaputt gehen
+- Backup 1 auch
+- Backup 2 = Sicherheitspuffer
+
+Warum 2 Medientypen?
+- Gleiche Medien haben gleiche Schwachstellen
+- Batch-Fehler bei HDDs derselben Charge
+
+Warum 1 Offsite?
+- Brand/Wasserschaden zerstört alles vor Ort
+- Ransomware verschlüsselt angeschlossene Laufwerke
+-->
+
+---
+
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# 3-2-1-Backup-Regel – Vertiefung
+
+Peter Krogh formulierte die Regel 2005 in „The DAM Book" (Digital Asset Management). Sie schützt gegen unterschiedliche Verlustszenarien:
+
+| Bedrohung | Schutz durch | Beispiel |
+|-----------|--------------|----------|
+| Hardware-Defekt | 3 Kopien | SSD stirbt → HDD-Backup vorhanden |
+| Firmware-Bug/Ransomware | 2 Medientypen | Malware infiziert nur ein System |
+| Feuer/Diebstahl/Flut | 1 Offsite | Haus brennt → Cloud-Backup sicher |
+
+**Moderne Erweiterung 3-2-1-1-0:**
+- **+1** Air-Gapped (offline, nicht verbunden)
+- **+0** Verifizierte Backups (regelmäßig Restore testen)
+
+**Ransomware-Problem:** Vernetzte Backups werden oft mitverschlüsselt. Air-Gapped-Medien (externe HDD im Safe, LTO-Band) bleiben sicher, weil sie physisch getrennt sind.
+
+**Realitäts-Check:** Die meisten Datenverluste entstehen durch menschliche Fehler (versehentliches Löschen), nicht Hardware-Ausfälle. Versionierte Backups (Time Machine, Borg) schützen auch davor – die gelöschte Datei existiert noch in älteren Snapshots.
+
+---
+
+# Backup-Arten
+
+**Vollständig (Full):**
+Kompletter Datenbestand jedes Mal.
+Einfach, aber langsam und platzhungrig.
+
+**Inkrementell:**
+Nur Änderungen seit dem letzten Backup.
+Schnell, aber Wiederherstellung komplex (Kette).
+
+**Differenziell:**
+Änderungen seit dem letzten Voll-Backup.
+Mittelweg zwischen beiden.
+
+<!--
+Typisches Schema:
+- Sonntag: Voll-Backup
+- Mo-Sa: Inkrementell oder Differenziell
+
+Inkrementell: Schnellstes Backup, langsamste Wiederherstellung
+Differenziell: Kompromiss
+Voll: Langsamstes Backup, schnellste Wiederherstellung
+-->
+
+---
+
+# Backup in der Praxis
+
+**macOS:** Time Machine
+**Windows:** Veeam Agent (kostenlos), Windows Backup
+**Linux:** rsync, Borg, Restic
+**Cloud:** Backblaze, iCloud, Google Drive
+
+**Wichtig:**
+- Automatisieren (manuell wird vergessen)
+- Regelmäßig testen (Backup nützt nichts, wenn Restore nicht funktioniert)
+
+<!--
+Time Machine: Stündliche Snapshots, APFS-Integration
+Veeam: Enterprise-Level, kostenlose Privatversion
+rsync: Unix-Klassiker, extrem effizient
+Borg: Deduplizierung + Verschlüsselung
+-->
+
+---
+
+# Langzeitarchivierung
+
+**Probleme:**
+- Bit Rot (Daten degradieren)
+- Format-Obsoleszenz (wer öffnet .wpd?)
+- Hardware-Obsoleszenz (Diskettenlaufwerk?)
+
+**Lösungen:**
+- Migration alle 5-10 Jahre auf neue Medien
+- Offene Standards (PDF/A, TIFF, Plain Text)
+- Redundante Kopien
+
+<!--
+WordPerfect dominierte die 1980er/90er.
+Heute kann kaum jemand .wpd-Dateien öffnen.
+
+Flash-Dateien (.swf) sind seit 2020 praktisch tot.
+Millionen von Websites und Spielen verloren.
+-->
+
+---
+
+# Archivmedien
+
+**LTO-Tapes:**
+- 18 TB pro Band (LTO-9)
+- ~5€/TB
+- 30 Jahre Haltbarkeit
+- Für Cold Storage ideal
+
+**M-DISC:**
+- Spezielle DVD/Blu-ray
+- 1.000+ Jahre Haltbarkeit (Herstellerangabe)
+- Für kleine, wichtige Daten
+
+**Cloud:**
+- Glacier, Backblaze B2
+- Günstig für Langzeit
+
+<!--
+LTO = Linear Tape-Open
+AWS, Google, Netflix nutzen Tape für Archive.
+
+M-DISC nutzt anorganische Schicht statt Dye.
+Theoretisch sehr langlebig, praktisch ungetestet.
+
+Cloud-Archive haben laufende Kosten.
+Aber: Keine Hardware-Wartung.
+-->
+
+---
+
+<!-- _class: lead -->
+
+# Schnittstellen
+
+---
+
+# USB: Die Universal-Schnittstelle
+
+| Version | Jahr | Geschwindigkeit |
+|---------|------|----------------:|
+| USB 1.1 | 1998 | 12 Mbit/s |
+| USB 2.0 | 2000 | 480 Mbit/s (~60 MB/s) |
+| USB 3.0 | 2008 | 5 Gbit/s (~625 MB/s) |
+| USB 3.1 Gen 2 | 2013 | 10 Gbit/s |
+| USB 3.2 Gen 2×2 | 2017 | 20 Gbit/s |
+| USB4 | 2019 | 40 Gbit/s |
+
+<!--
+USB = Universal Serial Bus
+
+Die Namensgebung ist ein Chaos.
+USB 3.0 wurde nachträglich zu "USB 3.1 Gen 1" umbenannt.
+Dann zu "USB 3.2 Gen 1".
+
+Die Industrie verwirrt absichtlich.
+-->
+
+---
+
+# USB-C: Der Stecker, nicht die Geschwindigkeit
+
+**USB-C ist ein Steckertyp, kein Protokoll!**
+
+Ein USB-C-Kabel kann sein:
+- USB 2.0 (480 Mbit/s)
+- USB 3.2 (bis 20 Gbit/s)
+- USB4 (40 Gbit/s)
+- Thunderbolt 3/4 (40 Gbit/s)
+
+**Am Stecker nicht erkennbar.**
+→ Kabel-Spezifikation prüfen!
+
+<!--
+Das ist eine häufige Quelle für Frustration.
+
+"Ich habe ein USB-C-Kabel, warum ist es so langsam?"
+Weil es ein USB 2.0-Kabel mit USB-C-Stecker ist.
+
+Gute Kabel sind teurer, aber es lohnt sich.
+-->
+
+---
+
+# Thunderbolt
+
+**Thunderbolt 3/4 (2015/2020):**
+- 40 Gbit/s
+- PCIe über Kabel (externe GPUs möglich)
+- DisplayPort integriert
+- USB-C-Stecker
+
+**Vorteile:**
+- Sehr schnell
+- Vielseitig (Daten, Video, Strom)
+
+**Nachteile:**
+- Teure Kabel
+- Nicht alle USB-C-Ports sind Thunderbolt
+
+<!--
+Intel und Apple entwickelten Thunderbolt gemeinsam.
+Lizenzfrei seit 2019.
+
+Thunderbolt-Kabel haben oft ein Blitz-Symbol.
+Aber nicht immer.
+-->
+
+---
+
+# Video-Schnittstellen
+
+| Schnittstelle | Max. Auflösung | Features |
+|---------------|---------------:|----------|
+| HDMI 2.0 | 4K/60Hz | ARC, CEC |
+| HDMI 2.1 | 8K/60Hz, 4K/120Hz | VRR, eARC |
+| DisplayPort 1.4 | 8K/60Hz | Daisy-Chain |
+| DisplayPort 2.0 | 16K/60Hz | Mehr Bandbreite |
+
+**HDMI:** Consumer-Geräte (TV, Konsolen)
+**DisplayPort:** Computer, Monitore
+
+<!--
+HDMI hat Lizenzgebühren, DisplayPort nicht.
+Deshalb ist DP bei Monitoren beliebter.
+
+DisplayPort kann Daisy-Chaining:
+Laptop → Monitor 1 → Monitor 2 über ein Kabel.
+
+HDMI hat ARC (Audio Return Channel):
+TV schickt Audio an Soundbar über HDMI.
+-->
+
+---
+
+# Netzwerk
+
+**Ethernet:**
+| Standard | Geschwindigkeit |
+|----------|----------------:|
+| Fast Ethernet | 100 Mbit/s |
+| Gigabit | 1 Gbit/s |
+| 2.5 Gigabit | 2,5 Gbit/s |
+| 10 Gigabit | 10 Gbit/s |
+
+**WiFi:**
+| Generation | Standard | Geschwindigkeit |
+|------------|----------|----------------:|
+| WiFi 5 | 802.11ac | ~1,3 Gbit/s |
+| WiFi 6 | 802.11ax | ~9,6 Gbit/s |
+| WiFi 7 | 802.11be | ~46 Gbit/s |
+
+<!--
+Gigabit-Ethernet ist heute Standard.
+2,5G und 10G verbreiten sich für NAS und Poweruser.
+
+WiFi-Geschwindigkeiten sind theoretische Maxima.
+Real: Bruchteil davon, abhängig von Entfernung und Störungen.
+-->
+
+---
+
+# Welche Schnittstelle für was?
+
+| Anwendung | Empfehlung |
+|-----------|------------|
+| Externe SSD | USB 3.2 Gen 2 oder Thunderbolt |
+| USB-Stick | USB 3.0 reicht |
+| Monitor | DisplayPort oder HDMI 2.0+ |
+| NAS im Heimnetz | Gigabit Ethernet |
+| Backup-Platte | USB 3.0 |
+| Video-Editing extern | Thunderbolt |
+
+<!--
+Die Schnittstelle muss zum Gerät passen.
+
+Externe HDD über Thunderbolt?
+Bringt nichts, die HDD ist der Flaschenhals.
+
+NVMe-SSD über USB 2.0?
+Verschwendung, USB ist der Flaschenhals.
+-->
+
+---
+
+<!-- _class: aufgabe -->
+
+# Hands-On: Eigene Speicher analysieren
+
+**Aufgabe (30 Min):**
+
+1. Welche Laufwerke habt ihr? (SSD, HDD, extern)
+2. Welches Dateisystem nutzt ihr?
+3. Wie ist eure Backup-Situation?
+4. Welche Schnittstellen nutzt ihr?
+
+**Tools:**
+- Windows: Datenträgerverwaltung
+- macOS: Festplattendienstprogramm
+- Linux: `lsblk`, `df -h`
+
+<!--
+Ziel: Bewusstsein für eigene Infrastruktur.
+
+Die meisten wissen nicht, welches Dateisystem
+auf ihrem USB-Stick ist.
+-->
+
+---
+
+<!-- _class: lead -->
+
+# Fragen & Diskussion
+
+**Kontakt:** lb-czechowski@hdm-stuttgart.de
+**Folien:** [librete.ch/hdm/223015b](https://librete.ch/hdm/223015b/)
+
+---
+
+# Lizenz & Attribution
+
+Diese Präsentation ist lizenziert unter **Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)**
+
+- Erlaubt Teilen & Anpassen mit Namensnennung
+- Adaptionen müssen unter gleicher Lizenz geteilt werden
+
+Vollständige Lizenz: [creativecommons.org/licenses/by-sa/4.0/](https://creativecommons.org/licenses/by-sa/4.0/)
+

slides/223015b/04-distribution-apis-zukunft.md

@@ -3,15 +3,15 @@ marp: true
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 paginate: true
 backgroundColor: #fff
-header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
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@@ -55,7 +77,7 @@ section.klausur footer {
 <!-- _footer: '' -->
 <!-- _backgroundColor: #000 -->
 
-![bg fit opacity:0.4](./assets/digital-landscape.png)
+![bg cover opacity:0.2](./assets/radek-grzybowski-eBRTYyjwpRY-unsplash.jpg)
 
 # Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 
@@ -63,7 +85,7 @@ section.klausur footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
@@ -78,7 +100,7 @@ Hochschule der Medien Stuttgart
 
 <!-- _class: lead -->
 
-# Termin 4 – 30.01.2026
+# Kapitel 4 – 30.01.2026
 ## Distribution, APIs & Zukunft
 
 ---
@@ -138,7 +160,7 @@ AWS Snowmobile: 45-Fuß-Container auf LKW
 
 **Prozess:**
 1. AWS schickt verschlüsseltes Gerät
-2. Kunde kopiert Daten lokal (schnell!)
+2. KundIn kopiert Daten lokal (schnell!)
 3. Gerät zurück an AWS
 4. AWS lädt in S3 hoch
 
@@ -198,7 +220,7 @@ Server unter Last (symbolisch)
 **Klassisches Modell:** Ein Server, viele Clients
 
 **Problem:**
-1 Million User wollen 1 GB-Datei
+1 Million Nutzende wollen 1 GB-Datei
 → Server braucht **1 PB Bandbreite!**
 → Server überlastet → **"Hug of Death"**
 
@@ -230,7 +252,7 @@ Globale Verteilung
 **Funktionsweise:**
 1. **Origin Server** (Hauptquelle)
 2. **Edge Servers** (geografisch verteilt)
-3. User → nächster Edge Server
+3. Nutzende → nächster Edge Server
 4. Erste Anfrage: Edge holt von Origin, cached
 5. Weitere Anfragen: Direkt vom Edge (schnell!)
 
@@ -255,7 +277,7 @@ Große CDN-Anbieter: Cloudflare, Akamai, Amazon CloudFront, Fastly
 - Lange Cache-Zeit (TTL: Tage/Wochen)
 
 **Dynamic Content:**
-- User-spezifisch (Profil)
+- Nutzungs-spezifisch (Profil)
 - Kurze TTL oder nicht cachebar
 
 **Cache Invalidation:**
@@ -327,14 +349,14 @@ Dezentral, jeder ist Client & Server
 - IPFS (InterPlanetary File System)
 - Blockchain (Bitcoin, Ethereum)
 
-**Vorteil:** Skalierbar (mehr User = mehr Bandbreite!)
+**Vorteil:** Skalierbar (mehr Nutzende = mehr Bandbreite!)
 
 **Nachteil:** Langsam bei wenigen Peers, oft für Piraterie missbraucht
 
 <!-- 
 P2P vs. Client-Server: Kein zentraler Server
-Last verteilt sich auf alle Teilnehmer
-Je mehr User, desto schneller (umgekehrt zu Client-Server!)
+Last verteilt sich auf alle Teilnehmenden
+Je mehr Nutzende, desto schneller (umgekehrt zu Client-Server!)
 Zensur-resistent: Kein Single Point of Failure
 Rechtliche Grauzone: Technologie neutral, aber oft illegal genutzt
 -->
@@ -1001,8 +1023,8 @@ Privacy-Albtraum
 
 **Beispiele:**
 - **Foto:** Kamera, Datum, GPS, Belichtung
-- **MP3:** Künstler, Album, Jahr, Genre, Cover
-- **PDF:** Autor, Datum, Software
+- **MP3:** KünstlerInnen, Album, Jahr, Genre, Cover
+- **PDF:** AutorIn, Datum, Software
 - **E-Mail:** Absender, Empfänger, Zeitstempel
 
 **Warum wichtig?**
@@ -1158,7 +1180,7 @@ Wikipedia für Musik-Metadaten
 **Idee:** Wikipedia für Musik-Metadaten
 
 **Community-gepflegt:**
-- Künstler, Alben, Tracks
+- KünstlerInnen, Alben, Tracks
 - Relationships (Band-Mitglieder, Label...)
 - Releases (verschiedene Editionen, Länder)
 
@@ -1217,7 +1239,7 @@ Versteckte Informationen sichtbar
 **PDF-Metadaten (XMP):**
 
 **Gespeichert:**
-- Titel, Autor, Betreff, Keywords
+- Titel, AutorIn, Betreff, Keywords
 - Erstellungsdatum, Änderungsdatum
 - Software, **Company** (aus Office-Lizenz!)
 
@@ -1246,7 +1268,7 @@ Dangerzone: FOSS-Tool (Freedom of Press Foundation)
 **Offene Formate:**
 ✓ Spezifikation öffentlich
 ✓ Keine Lizenzgebühren
-✓ Viele Programme unterstützen
+✓ Viele Programme unterstützen1
 **Beispiele:** PNG, OGG, MKV, Markdown, SVG
 
 **Proprietäre Formate:**
@@ -1261,7 +1283,7 @@ Lock-in: "Gefangene Daten" (nur in Software X öffenbar)
 Firma geht pleite → Format stirbt (WordPerfect-Beispiel)
 Offene Standards: Überlebensfähiger (Community kann implementieren)
 -->
-
+111
 ---
 
 # Vendor Lock-in: Beispiele
@@ -1578,7 +1600,7 @@ QKD: Abhör-sichere Kommunikation (Quantenmechanik garantiert)
 
 **Filecoin (2017):**
 - Blockchain-basiert
-- User vermieten Festplatten-Platz
+- Nutzende vermieten Festplatten-Platz
 - Bezahlung in FIL (Kryptowährung)
 
 **Arweave (2018):**
@@ -1616,7 +1638,7 @@ Legitime Use-Cases: NFT-Storage, Zensur-resistente Archivierung
 - 5G + Edge Computing nötig
 
 **Cloud Gaming:**
-- Spiel im Rechenzentrum, Stream zu User
+- Spiel im Rechenzentrum, Stream zu Nutzenden
 - Input-Lag = Todfeind (<50ms)
 
 **Problem:** Physik (Lichtgeschwindigkeit!)
@@ -1625,7 +1647,7 @@ Legitime Use-Cases: NFT-Storage, Zensur-resistente Archivierung
 8K: YouTube unterstützt, aber wer hat 8K-Monitor?
 VR: Meta Quest, Apple Vision Pro
 Latenz: Lichtgeschwindigkeit ~300.000 km/s, aber Routing + Processing addiert sich
-Edge Computing: Server näher an User (5G-Masten)
+Edge Computing: Server näher an Nutzende (5G-Masten)
 Cloud Gaming: Stadia gescheitert (2023 †), GeForce Now, Xbox Cloud
 Input-Lag: Fiber ~5ms/1000km, aber Server-Processing + Encoding + Decoding
 -->
@@ -1833,7 +1855,7 @@ Evaluation: Feedback ernst nehmen, Kurs verbessern
 
 # Fragen & Diskussion
 
-**Kontakt:** mail@librete.ch
+**Kontakt:** lb-czechowski@hdm-stuttgart.de
 **Folien:** Online verfügbar unter https://librete.ch/hdm/223015b
 
 ---

slides/223015b/05-vertiefung-offene-fragen.md

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 paginate: true
 backgroundColor: #fff
-header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
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-  color: #5da9e9;
+  background: #0f0f23;
   padding: 0.15em 0.4em;
   border-radius: 4px;
+  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
 }
+section code:not(.hljs) { color: #5fb3e4 !important; }
+section code.hljs { color: #f8f8f8 !important; }
 a {
   color: var(--color-highlight);
 }
+section.klausur {
+  background: repeating-linear-gradient(
+    135deg,
+    #e3f2fd,
+    #e3f2fd 40px,
+    #fff 40px,
+    #fff 80px
+  ) !important;
+}
+@media print {
   section.klausur {
     background: #e3f2fd !important;
   }
-section.klausur footer {
+}
+section.aufgabe {
+  background: #e3f2fd !important;
+}
+section.aufgabe footer {
   display: none;
 }
 </style>
@@ -55,7 +77,7 @@ section.klausur footer {
 <!-- _footer: '' -->
 <!-- _backgroundColor: #000 -->
 
-![bg fit opacity:0.4](./assets/digital-landscape.png)
+![bg cover opacity:0.2](./assets/radek-grzybowski-eBRTYyjwpRY-unsplash.jpg)
 
 # Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 
@@ -63,7 +85,7 @@ section.klausur footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
@@ -78,7 +100,7 @@ Hochschule der Medien Stuttgart
 
 <!-- _class: lead -->
 
-# Termin 5 – TBA
+# Kapitel 5 – TBA
 ## Vertiefung & Offene Fragen
 
 ---
@@ -104,7 +126,7 @@ Themen nach Interesse der Studierenden
 
 # Fragen & Diskussion
 
-**Kontakt:** mail@librete.ch
+**Kontakt:** lb-czechowski@hdm-stuttgart.de
 **Folien:** Online verfügbar unter https://librete.ch/hdm/223015b
 
 ---

slides/223015b/assets/demos/ascii-table.html

@@ -0,0 +1,311 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>ASCII-Tabelle</title>
+<style>
+  :root {
+    --hl: #1e5f8a;
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --border: #cbd5e1;
+    --bg-soft: #f8fafc;
+    --c-ctrl: #e5e7eb;     /* control */
+    --c-ctrl-text: #4b5563;
+    --c-space: #fef3c7;    /* space */
+    --c-punct: #ddd6fe;    /* punctuation */
+    --c-digit: #bfdbfe;    /* digits */
+    --c-upper: #bbf7d0;    /* uppercase */
+    --c-lower: #fed7aa;    /* lowercase */
+    --c-del:   #fecaca;    /* DEL */
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 18px 24px; }
+  h1 { text-align: center; margin: 0 0 2px; font-size: 1.5rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 14px; font-size: 0.9rem; }
+  .sub strong { color: var(--dark); }
+
+  .table-wrap { display: flex; justify-content: center; }
+
+  table.ascii {
+    border-collapse: separate;
+    border-spacing: 3px;
+    font-family: ui-monospace, "SF Mono", Menlo, monospace;
+  }
+  table.ascii th, table.ascii td {
+    width: 68px;
+    height: 60px;
+    padding: 0;
+    text-align: center;
+    vertical-align: middle;
+    border-radius: 5px;
+  }
+  table.ascii th {
+    background: var(--dark); color: #fff;
+    font-size: 0.78rem;
+    letter-spacing: 0.05em;
+    font-weight: 700;
+    width: 56px;
+    height: 36px;
+  }
+  table.ascii th.row { width: 64px; }
+  table.ascii th .b { display: block; font-size: 0.68rem; opacity: 0.7; font-weight: 400; margin-top: 2px; letter-spacing: 0.04em; }
+
+  table.ascii td {
+    border: 1px solid var(--border);
+    position: relative;
+  }
+  td .hex { position: absolute; top: 3px; left: 5px; font-size: 0.62rem; color: var(--muted); font-weight: 700; }
+  td .dec { position: absolute; bottom: 3px; right: 5px; font-size: 0.62rem; color: var(--muted); font-weight: 400; }
+  td .ch { font-size: 1.45rem; font-weight: 700; line-height: 1; }
+  td.ctrl .ch { font-size: 0.82rem; font-weight: 700; }
+  td.ctrl .ch small { display: block; font-size: 0.6rem; font-weight: 400; color: var(--muted); margin-top: 2px; letter-spacing: 0; }
+
+  td.ctrl  { background: var(--c-ctrl); color: var(--c-ctrl-text); }
+  td.space { background: var(--c-space); }
+  td.punct { background: var(--c-punct); }
+  td.digit { background: var(--c-digit); }
+  td.upper { background: var(--c-upper); }
+  td.lower { background: var(--c-lower); }
+  td.del   { background: var(--c-del); color: var(--c-ctrl-text); }
+
+  .legend {
+    margin: 14px auto 0;
+    display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
+    font-size: 0.85rem;
+  }
+  .legend .item { display: flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 4px; border: 1px solid var(--border); }
+  .legend .swatch { width: 14px; height: 14px; border-radius: 3px; border: 1px solid var(--border); }
+  .legend .swatch.ctrl  { background: var(--c-ctrl); }
+  .legend .swatch.space { background: var(--c-space); }
+  .legend .swatch.punct { background: var(--c-punct); }
+  .legend .swatch.digit { background: var(--c-digit); }
+  .legend .swatch.upper { background: var(--c-upper); }
+  .legend .swatch.lower { background: var(--c-lower); }
+  .legend .swatch.del   { background: var(--c-del); }
+
+  .meta-row {
+    margin-top: 10px;
+    display: flex; gap: 18px; justify-content: center;
+    font-size: 0.85rem; color: var(--muted);
+  }
+  .meta-row strong { color: var(--dark); }
+  .meta-row code { background: var(--dark); color: #f8f8f8; padding: 1px 6px; border-radius: 3px; font-family: ui-monospace, monospace; }
+</style>
+</head>
+<body>
+  <h1>ASCII-Tabelle (1963) · 7 Bit · 128 Zeichen</h1>
+  <div class="sub">Spalte = High-Nibble (Hex 0–7) · Zeile = Low-Nibble (Hex 0–F) · <strong>Hex</strong> oben, <strong>Dezimal</strong> unten</div>
+
+  <div class="table-wrap">
+  <table class="ascii">
+    <thead>
+      <tr>
+        <th class="row">↓ Low<br>→ High</th>
+        <th>0<span class="b">0000</span></th>
+        <th>1<span class="b">0001</span></th>
+        <th>2<span class="b">0010</span></th>
+        <th>3<span class="b">0011</span></th>
+        <th>4<span class="b">0100</span></th>
+        <th>5<span class="b">0101</span></th>
+        <th>6<span class="b">0110</span></th>
+        <th>7<span class="b">0111</span></th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <th class="row">0<span class="b">0000</span></th>
+        <td class="ctrl"><span class="hex">00</span><span class="ch">NUL<small>null</small></span><span class="dec">0</span></td>
+        <td class="ctrl"><span class="hex">10</span><span class="ch">DLE<small>data link esc</small></span><span class="dec">16</span></td>
+        <td class="space"><span class="hex">20</span><span class="ch">SP<small>space</small></span><span class="dec">32</span></td>
+        <td class="digit"><span class="hex">30</span><span class="ch">0</span><span class="dec">48</span></td>
+        <td class="punct"><span class="hex">40</span><span class="ch">@</span><span class="dec">64</span></td>
+        <td class="upper"><span class="hex">50</span><span class="ch">P</span><span class="dec">80</span></td>
+        <td class="punct"><span class="hex">60</span><span class="ch">`</span><span class="dec">96</span></td>
+        <td class="lower"><span class="hex">70</span><span class="ch">p</span><span class="dec">112</span></td>
+      </tr>
+      <tr>
+        <th class="row">1<span class="b">0001</span></th>
+        <td class="ctrl"><span class="hex">01</span><span class="ch">SOH<small>start hdr</small></span><span class="dec">1</span></td>
+        <td class="ctrl"><span class="hex">11</span><span class="ch">DC1<small>XON</small></span><span class="dec">17</span></td>
+        <td class="punct"><span class="hex">21</span><span class="ch">!</span><span class="dec">33</span></td>
+        <td class="digit"><span class="hex">31</span><span class="ch">1</span><span class="dec">49</span></td>
+        <td class="upper"><span class="hex">41</span><span class="ch">A</span><span class="dec">65</span></td>
+        <td class="upper"><span class="hex">51</span><span class="ch">Q</span><span class="dec">81</span></td>
+        <td class="lower"><span class="hex">61</span><span class="ch">a</span><span class="dec">97</span></td>
+        <td class="lower"><span class="hex">71</span><span class="ch">q</span><span class="dec">113</span></td>
+      </tr>
+      <tr>
+        <th class="row">2<span class="b">0010</span></th>
+        <td class="ctrl"><span class="hex">02</span><span class="ch">STX<small>start txt</small></span><span class="dec">2</span></td>
+        <td class="ctrl"><span class="hex">12</span><span class="ch">DC2</span><span class="dec">18</span></td>
+        <td class="punct"><span class="hex">22</span><span class="ch">"</span><span class="dec">34</span></td>
+        <td class="digit"><span class="hex">32</span><span class="ch">2</span><span class="dec">50</span></td>
+        <td class="upper"><span class="hex">42</span><span class="ch">B</span><span class="dec">66</span></td>
+        <td class="upper"><span class="hex">52</span><span class="ch">R</span><span class="dec">82</span></td>
+        <td class="lower"><span class="hex">62</span><span class="ch">b</span><span class="dec">98</span></td>
+        <td class="lower"><span class="hex">72</span><span class="ch">r</span><span class="dec">114</span></td>
+      </tr>
+      <tr>
+        <th class="row">3<span class="b">0011</span></th>
+        <td class="ctrl"><span class="hex">03</span><span class="ch">ETX<small>end txt</small></span><span class="dec">3</span></td>
+        <td class="ctrl"><span class="hex">13</span><span class="ch">DC3<small>XOFF</small></span><span class="dec">19</span></td>
+        <td class="punct"><span class="hex">23</span><span class="ch">#</span><span class="dec">35</span></td>
+        <td class="digit"><span class="hex">33</span><span class="ch">3</span><span class="dec">51</span></td>
+        <td class="upper"><span class="hex">43</span><span class="ch">C</span><span class="dec">67</span></td>
+        <td class="upper"><span class="hex">53</span><span class="ch">S</span><span class="dec">83</span></td>
+        <td class="lower"><span class="hex">63</span><span class="ch">c</span><span class="dec">99</span></td>
+        <td class="lower"><span class="hex">73</span><span class="ch">s</span><span class="dec">115</span></td>
+      </tr>
+      <tr>
+        <th class="row">4<span class="b">0100</span></th>
+        <td class="ctrl"><span class="hex">04</span><span class="ch">EOT<small>end trans</small></span><span class="dec">4</span></td>
+        <td class="ctrl"><span class="hex">14</span><span class="ch">DC4</span><span class="dec">20</span></td>
+        <td class="punct"><span class="hex">24</span><span class="ch">$</span><span class="dec">36</span></td>
+        <td class="digit"><span class="hex">34</span><span class="ch">4</span><span class="dec">52</span></td>
+        <td class="upper"><span class="hex">44</span><span class="ch">D</span><span class="dec">68</span></td>
+        <td class="upper"><span class="hex">54</span><span class="ch">T</span><span class="dec">84</span></td>
+        <td class="lower"><span class="hex">64</span><span class="ch">d</span><span class="dec">100</span></td>
+        <td class="lower"><span class="hex">74</span><span class="ch">t</span><span class="dec">116</span></td>
+      </tr>
+      <tr>
+        <th class="row">5<span class="b">0101</span></th>
+        <td class="ctrl"><span class="hex">05</span><span class="ch">ENQ<small>enquiry</small></span><span class="dec">5</span></td>
+        <td class="ctrl"><span class="hex">15</span><span class="ch">NAK</span><span class="dec">21</span></td>
+        <td class="punct"><span class="hex">25</span><span class="ch">%</span><span class="dec">37</span></td>
+        <td class="digit"><span class="hex">35</span><span class="ch">5</span><span class="dec">53</span></td>
+        <td class="upper"><span class="hex">45</span><span class="ch">E</span><span class="dec">69</span></td>
+        <td class="upper"><span class="hex">55</span><span class="ch">U</span><span class="dec">85</span></td>
+        <td class="lower"><span class="hex">65</span><span class="ch">e</span><span class="dec">101</span></td>
+        <td class="lower"><span class="hex">75</span><span class="ch">u</span><span class="dec">117</span></td>
+      </tr>
+      <tr>
+        <th class="row">6<span class="b">0110</span></th>
+        <td class="ctrl"><span class="hex">06</span><span class="ch">ACK<small>ack</small></span><span class="dec">6</span></td>
+        <td class="ctrl"><span class="hex">16</span><span class="ch">SYN</span><span class="dec">22</span></td>
+        <td class="punct"><span class="hex">26</span><span class="ch">&amp;</span><span class="dec">38</span></td>
+        <td class="digit"><span class="hex">36</span><span class="ch">6</span><span class="dec">54</span></td>
+        <td class="upper"><span class="hex">46</span><span class="ch">F</span><span class="dec">70</span></td>
+        <td class="upper"><span class="hex">56</span><span class="ch">V</span><span class="dec">86</span></td>
+        <td class="lower"><span class="hex">66</span><span class="ch">f</span><span class="dec">102</span></td>
+        <td class="lower"><span class="hex">76</span><span class="ch">v</span><span class="dec">118</span></td>
+      </tr>
+      <tr>
+        <th class="row">7<span class="b">0111</span></th>
+        <td class="ctrl"><span class="hex">07</span><span class="ch">BEL<small>bell 🔔</small></span><span class="dec">7</span></td>
+        <td class="ctrl"><span class="hex">17</span><span class="ch">ETB</span><span class="dec">23</span></td>
+        <td class="punct"><span class="hex">27</span><span class="ch">'</span><span class="dec">39</span></td>
+        <td class="digit"><span class="hex">37</span><span class="ch">7</span><span class="dec">55</span></td>
+        <td class="upper"><span class="hex">47</span><span class="ch">G</span><span class="dec">71</span></td>
+        <td class="upper"><span class="hex">57</span><span class="ch">W</span><span class="dec">87</span></td>
+        <td class="lower"><span class="hex">67</span><span class="ch">g</span><span class="dec">103</span></td>
+        <td class="lower"><span class="hex">77</span><span class="ch">w</span><span class="dec">119</span></td>
+      </tr>
+      <tr>
+        <th class="row">8<span class="b">1000</span></th>
+        <td class="ctrl"><span class="hex">08</span><span class="ch">BS<small>backspace</small></span><span class="dec">8</span></td>
+        <td class="ctrl"><span class="hex">18</span><span class="ch">CAN</span><span class="dec">24</span></td>
+        <td class="punct"><span class="hex">28</span><span class="ch">(</span><span class="dec">40</span></td>
+        <td class="digit"><span class="hex">38</span><span class="ch">8</span><span class="dec">56</span></td>
+        <td class="upper"><span class="hex">48</span><span class="ch">H</span><span class="dec">72</span></td>
+        <td class="upper"><span class="hex">58</span><span class="ch">X</span><span class="dec">88</span></td>
+        <td class="lower"><span class="hex">68</span><span class="ch">h</span><span class="dec">104</span></td>
+        <td class="lower"><span class="hex">78</span><span class="ch">x</span><span class="dec">120</span></td>
+      </tr>
+      <tr>
+        <th class="row">9<span class="b">1001</span></th>
+        <td class="ctrl"><span class="hex">09</span><span class="ch">HT<small>tab ⇥</small></span><span class="dec">9</span></td>
+        <td class="ctrl"><span class="hex">19</span><span class="ch">EM</span><span class="dec">25</span></td>
+        <td class="punct"><span class="hex">29</span><span class="ch">)</span><span class="dec">41</span></td>
+        <td class="digit"><span class="hex">39</span><span class="ch">9</span><span class="dec">57</span></td>
+        <td class="upper"><span class="hex">49</span><span class="ch">I</span><span class="dec">73</span></td>
+        <td class="upper"><span class="hex">59</span><span class="ch">Y</span><span class="dec">89</span></td>
+        <td class="lower"><span class="hex">69</span><span class="ch">i</span><span class="dec">105</span></td>
+        <td class="lower"><span class="hex">79</span><span class="ch">y</span><span class="dec">121</span></td>
+      </tr>
+      <tr>
+        <th class="row">A<span class="b">1010</span></th>
+        <td class="ctrl"><span class="hex">0A</span><span class="ch">LF<small>↵ newline</small></span><span class="dec">10</span></td>
+        <td class="ctrl"><span class="hex">1A</span><span class="ch">SUB<small>EOF DOS</small></span><span class="dec">26</span></td>
+        <td class="punct"><span class="hex">2A</span><span class="ch">*</span><span class="dec">42</span></td>
+        <td class="punct"><span class="hex">3A</span><span class="ch">:</span><span class="dec">58</span></td>
+        <td class="upper"><span class="hex">4A</span><span class="ch">J</span><span class="dec">74</span></td>
+        <td class="upper"><span class="hex">5A</span><span class="ch">Z</span><span class="dec">90</span></td>
+        <td class="lower"><span class="hex">6A</span><span class="ch">j</span><span class="dec">106</span></td>
+        <td class="lower"><span class="hex">7A</span><span class="ch">z</span><span class="dec">122</span></td>
+      </tr>
+      <tr>
+        <th class="row">B<span class="b">1011</span></th>
+        <td class="ctrl"><span class="hex">0B</span><span class="ch">VT</span><span class="dec">11</span></td>
+        <td class="ctrl"><span class="hex">1B</span><span class="ch">ESC<small>escape</small></span><span class="dec">27</span></td>
+        <td class="punct"><span class="hex">2B</span><span class="ch">+</span><span class="dec">43</span></td>
+        <td class="punct"><span class="hex">3B</span><span class="ch">;</span><span class="dec">59</span></td>
+        <td class="upper"><span class="hex">4B</span><span class="ch">K</span><span class="dec">75</span></td>
+        <td class="punct"><span class="hex">5B</span><span class="ch">[</span><span class="dec">91</span></td>
+        <td class="lower"><span class="hex">6B</span><span class="ch">k</span><span class="dec">107</span></td>
+        <td class="punct"><span class="hex">7B</span><span class="ch">{</span><span class="dec">123</span></td>
+      </tr>
+      <tr>
+        <th class="row">C<span class="b">1100</span></th>
+        <td class="ctrl"><span class="hex">0C</span><span class="ch">FF<small>form feed</small></span><span class="dec">12</span></td>
+        <td class="ctrl"><span class="hex">1C</span><span class="ch">FS</span><span class="dec">28</span></td>
+        <td class="punct"><span class="hex">2C</span><span class="ch">,</span><span class="dec">44</span></td>
+        <td class="punct"><span class="hex">3C</span><span class="ch">&lt;</span><span class="dec">60</span></td>
+        <td class="upper"><span class="hex">4C</span><span class="ch">L</span><span class="dec">76</span></td>
+        <td class="punct"><span class="hex">5C</span><span class="ch">\</span><span class="dec">92</span></td>
+        <td class="lower"><span class="hex">6C</span><span class="ch">l</span><span class="dec">108</span></td>
+        <td class="punct"><span class="hex">7C</span><span class="ch">|</span><span class="dec">124</span></td>
+      </tr>
+      <tr>
+        <th class="row">D<span class="b">1101</span></th>
+        <td class="ctrl"><span class="hex">0D</span><span class="ch">CR<small>carriage</small></span><span class="dec">13</span></td>
+        <td class="ctrl"><span class="hex">1D</span><span class="ch">GS</span><span class="dec">29</span></td>
+        <td class="punct"><span class="hex">2D</span><span class="ch">-</span><span class="dec">45</span></td>
+        <td class="punct"><span class="hex">3D</span><span class="ch">=</span><span class="dec">61</span></td>
+        <td class="upper"><span class="hex">4D</span><span class="ch">M</span><span class="dec">77</span></td>
+        <td class="punct"><span class="hex">5D</span><span class="ch">]</span><span class="dec">93</span></td>
+        <td class="lower"><span class="hex">6D</span><span class="ch">m</span><span class="dec">109</span></td>
+        <td class="punct"><span class="hex">7D</span><span class="ch">}</span><span class="dec">125</span></td>
+      </tr>
+      <tr>
+        <th class="row">E<span class="b">1110</span></th>
+        <td class="ctrl"><span class="hex">0E</span><span class="ch">SO</span><span class="dec">14</span></td>
+        <td class="ctrl"><span class="hex">1E</span><span class="ch">RS</span><span class="dec">30</span></td>
+        <td class="punct"><span class="hex">2E</span><span class="ch">.</span><span class="dec">46</span></td>
+        <td class="punct"><span class="hex">3E</span><span class="ch">&gt;</span><span class="dec">62</span></td>
+        <td class="upper"><span class="hex">4E</span><span class="ch">N</span><span class="dec">78</span></td>
+        <td class="punct"><span class="hex">5E</span><span class="ch">^</span><span class="dec">94</span></td>
+        <td class="lower"><span class="hex">6E</span><span class="ch">n</span><span class="dec">110</span></td>
+        <td class="punct"><span class="hex">7E</span><span class="ch">~</span><span class="dec">126</span></td>
+      </tr>
+      <tr>
+        <th class="row">F<span class="b">1111</span></th>
+        <td class="ctrl"><span class="hex">0F</span><span class="ch">SI</span><span class="dec">15</span></td>
+        <td class="ctrl"><span class="hex">1F</span><span class="ch">US</span><span class="dec">31</span></td>
+        <td class="punct"><span class="hex">2F</span><span class="ch">/</span><span class="dec">47</span></td>
+        <td class="punct"><span class="hex">3F</span><span class="ch">?</span><span class="dec">63</span></td>
+        <td class="upper"><span class="hex">4F</span><span class="ch">O</span><span class="dec">79</span></td>
+        <td class="punct"><span class="hex">5F</span><span class="ch">_</span><span class="dec">95</span></td>
+        <td class="lower"><span class="hex">6F</span><span class="ch">o</span><span class="dec">111</span></td>
+        <td class="del"><span class="hex">7F</span><span class="ch">DEL</span><span class="dec">127</span></td>
+      </tr>
+    </tbody>
+  </table>
+  </div>
+
+  <div class="legend">
+    <div class="item"><span class="swatch ctrl"></span>Steuerzeichen (0–31)</div>
+    <div class="item"><span class="swatch space"></span>Leerzeichen (32)</div>
+    <div class="item"><span class="swatch punct"></span>Satzzeichen</div>
+    <div class="item"><span class="swatch digit"></span>Ziffern (48–57)</div>
+    <div class="item"><span class="swatch upper"></span>Großbuchstaben (65–90)</div>
+    <div class="item"><span class="swatch lower"></span>Kleinbuchstaben (97–122)</div>
+    <div class="item"><span class="swatch del"></span>DEL (127)</div>
+  </div>
+
+  <div class="meta-row">
+    <span><strong>Beispiel:</strong> <code>A</code> = Hex <code>41</code> = Dez <code>65</code> = Bin <code>0100&nbsp;0001</code></span>
+    <span><strong>Trick:</strong> Ziffern <code>0–9</code> liegen bei <code>30–39</code> · <code>'A'+1='B'</code> · Groß ↔ Klein: Bit 5 togglen</span>
+  </div>
+</body>
+</html>

slides/223015b/assets/demos/byte-flow.html

@@ -0,0 +1,180 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Byte-Fluss: Bit → Hex → ASCII</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --border: #cbd5e1;
+    --bg-soft: #f8fafc;
+    --byte-border: #94a3b8;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 22px 28px; }
+  h1 { text-align: center; margin: 0 0 4px; font-size: 1.55rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 18px; font-size: 0.95rem; }
+
+  .stage { display: flex; flex-direction: column; align-items: center; gap: 8px; max-width: 920px; margin: 0 auto; }
+
+  .file {
+    width: 100%; box-sizing: border-box;
+    border: 2px solid var(--dark);
+    border-radius: 10px;
+    background: var(--bg-soft);
+    overflow: hidden;
+    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
+  }
+  .file .head {
+    background: var(--dark); color: #fff; padding: 8px 14px;
+    font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700;
+    display: flex; justify-content: space-between; align-items: center;
+  }
+  .file .head .name { font-family: ui-monospace, monospace; }
+  .file .head .meta { font-weight: 400; opacity: 0.7; text-transform: none; letter-spacing: 0; font-size: 0.85em; }
+  .file .body { padding: 12px 14px; }
+
+  .row-bytes { display: flex; gap: 6px; margin-bottom: 6px; flex-wrap: nowrap; }
+  .row-bytes:last-child { margin-bottom: 0; }
+
+  .byte-bin {
+    border: 1px solid var(--byte-border);
+    border-radius: 4px;
+    padding: 4px 7px;
+    font-family: ui-monospace, "SF Mono", Menlo, monospace;
+    font-size: 0.92rem;
+    font-weight: 700;
+    background: #fff;
+    letter-spacing: 0.04em;
+  }
+  .byte-hex {
+    border: 1px solid var(--byte-border);
+    border-radius: 4px;
+    padding: 6px 0;
+    font-family: ui-monospace, monospace;
+    font-size: 1.1rem;
+    font-weight: 700;
+    background: #fff;
+    min-width: 88px;
+    text-align: center;
+  }
+  .byte-ascii {
+    border: 1px solid var(--byte-border);
+    border-radius: 4px;
+    padding: 6px 0;
+    font-family: ui-monospace, monospace;
+    font-size: 1.2rem;
+    font-weight: 700;
+    background: #fff;
+    min-width: 88px;
+    text-align: center;
+  }
+  .byte-ascii.np { color: var(--muted); font-style: italic; }
+
+  .truncate { color: var(--muted); font-family: ui-monospace, monospace; padding: 4px 6px; font-weight: 700; align-self: center; }
+
+  .arrow-stack { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 4px 0; }
+  .arrow {
+    width: 0; height: 0;
+    border-left: 11px solid transparent;
+    border-right: 11px solid transparent;
+    border-top: 14px solid var(--hl);
+  }
+  .arrow-label {
+    font-size: 0.78rem; color: var(--hl); font-weight: 700;
+    text-transform: uppercase; letter-spacing: 0.05em;
+  }
+
+  .legend {
+    margin-top: 12px;
+    display: flex; gap: 14px; flex-wrap: wrap; justify-content: center;
+    font-size: 0.85rem; color: var(--muted);
+  }
+  .legend strong { color: var(--dark); }
+  .legend code { background: var(--bg-soft); border: 1px solid var(--border); padding: 1px 6px; border-radius: 3px; font-family: ui-monospace, monospace; }
+</style>
+</head>
+<body>
+  <h1>1 Byte = 8 Bit = 2 Hex = 1 ASCII-Zeichen</h1>
+  <div class="sub">Dieselbe Datei — dieselben Byte, drei Schreibweisen. Jeder Rahmen = ein Byte.</div>
+
+  <div class="stage">
+
+    <!-- Stage 1: Bitstream -->
+    <div class="file">
+      <div class="head"><span class="name">datei.bin</span><span class="meta">Roh-Bit · 8 Bit pro Rahmen</span></div>
+      <div class="body">
+        <div class="row-bytes">
+          <span class="byte-bin">01001000</span><span class="byte-bin">01100101</span><span class="byte-bin">01101100</span><span class="byte-bin">01101100</span><span class="byte-bin">01101111</span><span class="byte-bin">00101100</span><span class="byte-bin">00100000</span><span class="byte-bin">01010111</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-bin">01101111</span><span class="byte-bin">01110010</span><span class="byte-bin">01101100</span><span class="byte-bin">01100100</span><span class="byte-bin">00100001</span><span class="byte-bin">00100000</span><span class="byte-bin">01001000</span><span class="byte-bin">01101111</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-bin">01110111</span><span class="byte-bin">00100000</span><span class="byte-bin">01100001</span><span class="byte-bin">01110010</span><span class="byte-bin">01100101</span><span class="byte-bin">00100000</span><span class="byte-bin">01111001</span><span class="byte-bin">01101111</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-bin">01110101</span><span class="byte-bin">00111111</span><span class="byte-bin">00001010</span><span class="truncate">… (weitere Byte)</span>
+        </div>
+      </div>
+    </div>
+
+    <div class="arrow-stack">
+      <div class="arrow-label">je 8 Bit → 2 Hex-Ziffern</div>
+      <div class="arrow"></div>
+    </div>
+
+    <!-- Stage 2: Hex -->
+    <div class="file">
+      <div class="head"><span class="name">datei.hex</span><span class="meta">Hex-Sicht · 2 Hex-Ziffern pro Rahmen</span></div>
+      <div class="body">
+        <div class="row-bytes">
+          <span class="byte-hex">48</span><span class="byte-hex">65</span><span class="byte-hex">6C</span><span class="byte-hex">6C</span><span class="byte-hex">6F</span><span class="byte-hex">2C</span><span class="byte-hex">20</span><span class="byte-hex">57</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-hex">6F</span><span class="byte-hex">72</span><span class="byte-hex">6C</span><span class="byte-hex">64</span><span class="byte-hex">21</span><span class="byte-hex">20</span><span class="byte-hex">48</span><span class="byte-hex">6F</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-hex">77</span><span class="byte-hex">20</span><span class="byte-hex">61</span><span class="byte-hex">72</span><span class="byte-hex">65</span><span class="byte-hex">20</span><span class="byte-hex">79</span><span class="byte-hex">6F</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-hex">75</span><span class="byte-hex">3F</span><span class="byte-hex">0A</span><span class="truncate">…</span>
+        </div>
+      </div>
+    </div>
+
+    <div class="arrow-stack">
+      <div class="arrow-label">je 1 Byte → 1 Zeichen</div>
+      <div class="arrow"></div>
+    </div>
+
+    <!-- Stage 3: ASCII -->
+    <div class="file">
+      <div class="head"><span class="name">datei.txt</span><span class="meta">Text-Sicht · 1 ASCII-Zeichen pro Rahmen</span></div>
+      <div class="body">
+        <div class="row-bytes">
+          <span class="byte-ascii">H</span><span class="byte-ascii">e</span><span class="byte-ascii">l</span><span class="byte-ascii">l</span><span class="byte-ascii">o</span><span class="byte-ascii">,</span><span class="byte-ascii np">␣</span><span class="byte-ascii">W</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-ascii">o</span><span class="byte-ascii">r</span><span class="byte-ascii">l</span><span class="byte-ascii">d</span><span class="byte-ascii">!</span><span class="byte-ascii np">␣</span><span class="byte-ascii">H</span><span class="byte-ascii">o</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-ascii">w</span><span class="byte-ascii np">␣</span><span class="byte-ascii">a</span><span class="byte-ascii">r</span><span class="byte-ascii">e</span><span class="byte-ascii np">␣</span><span class="byte-ascii">y</span><span class="byte-ascii">o</span>
+        </div>
+        <div class="row-bytes">
+          <span class="byte-ascii">u</span><span class="byte-ascii">?</span><span class="byte-ascii np">↵</span><span class="truncate">…</span>
+        </div>
+      </div>
+    </div>
+
+    <div class="legend">
+      <span><code>␣</code> = Leerzeichen (0x20)</span>
+      <span><code>↵</code> = Zeilenumbruch (0x0A, nicht druckbar)</span>
+      <span><strong>Byte ändern sich nicht.</strong> Nur die Anzeige.</span>
+    </div>
+
+  </div>
+</body>
+</html>

slides/223015b/assets/demos/byte-nibble-hex.html

@@ -0,0 +1,185 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Byte → Nibble → Hex</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --border: #cbd5e1;
+    --bg-soft: #f8fafc;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 28px 32px; }
+  h1 { text-align: center; margin: 0 0 4px; font-size: 1.55rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 22px; font-size: 0.95rem; }
+
+  .stage { display: flex; flex-direction: column; align-items: center; gap: 6px; }
+
+  .level { display: flex; flex-direction: column; align-items: center; }
+  .label { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; font-weight: 600; }
+
+  /* Level 1: whole byte */
+  .byte {
+    display: flex;
+    gap: 4px;
+    padding: 8px 14px;
+    border: 2px solid var(--dark);
+    border-radius: 8px;
+    background: var(--bg-soft);
+  }
+  .byte .bit { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 1.3rem; font-weight: 700; padding: 4px 8px; min-width: 22px; text-align: center; }
+  .byte .sep { width: 2px; background: var(--hl); margin: 2px 6px; border-radius: 2px; }
+
+  /* Split arrows */
+  .split { display: flex; justify-content: space-between; width: 360px; margin: 2px 0; }
+  .split .arrow {
+    width: 0; height: 0;
+    border-left: 9px solid transparent;
+    border-right: 9px solid transparent;
+    border-top: 12px solid var(--hl);
+  }
+
+  /* Level 2: two nibbles */
+  .nibbles { display: flex; gap: 80px; }
+  .nibble {
+    display: flex; flex-direction: column; align-items: center; gap: 6px;
+    padding: 10px 14px;
+    border: 2px solid var(--hl);
+    border-radius: 8px;
+    background: #fff;
+  }
+  .nibble .bits { display: flex; gap: 4px; font-family: ui-monospace, monospace; font-size: 1.15rem; font-weight: 700; }
+  .nibble .bits span { padding: 2px 6px; min-width: 20px; text-align: center; }
+  .nibble .meta { font-size: 0.78rem; color: var(--muted); }
+
+  .single-arrow {
+    width: 0; height: 0;
+    border-left: 9px solid transparent;
+    border-right: 9px solid transparent;
+    border-top: 12px solid var(--hl);
+    margin: 2px 0;
+  }
+
+  /* Level 3: hex digits */
+  .hex-digits { display: flex; gap: 80px; }
+  .hex-digit {
+    display: flex; flex-direction: column; align-items: center; gap: 4px;
+    padding: 8px 22px;
+    border: 2px solid var(--dark);
+    border-radius: 8px;
+    background: var(--dark);
+    color: var(--hl);
+  }
+  .hex-digit .digit { font-family: ui-monospace, monospace; font-size: 2rem; font-weight: 800; line-height: 1; }
+  .hex-digit .meta { font-size: 0.72rem; color: #f3f4f6; opacity: 0.7; }
+
+  /* Merge down to byte */
+  .merge {
+    display: flex; justify-content: center; margin-top: 2px;
+  }
+  .merge-v {
+    display: grid;
+    grid-template-columns: 60px 60px;
+    justify-content: center;
+    align-items: center;
+  }
+  .merge-v .line {
+    height: 20px;
+    border-right: 2px solid var(--hl);
+  }
+  .merge-v .line.l { border-right: none; border-left: 2px solid var(--hl); }
+  .bottom-bar { height: 2px; background: var(--hl); width: 120px; }
+
+  /* Final result */
+  .result {
+    margin-top: 14px;
+    padding: 14px 22px;
+    background: #fef3f8;
+    border-left: 4px solid var(--hl);
+    border-radius: 4px;
+    font-size: 1.05rem;
+    text-align: center;
+    max-width: 640px;
+  }
+  .result code { background: var(--dark); color: var(--hl); padding: 2px 8px; border-radius: 4px; font-family: ui-monospace, monospace; font-weight: 700; }
+  .result strong { color: var(--hl); }
+
+  .math {
+    margin-top: 10px;
+    font-size: 0.95rem;
+    color: var(--dark);
+    text-align: center;
+  }
+  .math .eq { font-family: ui-monospace, monospace; font-weight: 700; }
+</style>
+</head>
+<body>
+  <h1>1 Byte → 2 Nibble → 2 Hex-Ziffern</h1>
+  <div class="sub">Jedes Byte lässt sich sauber halbieren – und 4 Bit passen exakt auf eine Hex-Ziffer.</div>
+
+  <div class="stage">
+    <!-- Level 1 -->
+    <div class="level">
+      <div class="label">1 Byte · 8 Bit · 2⁸ = 256 Werte</div>
+      <div class="byte">
+        <span class="bit">0</span><span class="bit">1</span><span class="bit">0</span><span class="bit">0</span>
+        <span class="sep"></span>
+        <span class="bit">1</span><span class="bit">1</span><span class="bit">0</span><span class="bit">1</span>
+      </div>
+    </div>
+
+    <div class="split">
+      <div class="arrow"></div>
+      <div class="arrow"></div>
+    </div>
+
+    <!-- Level 2 -->
+    <div class="level">
+      <div class="label">2 Nibble · je 4 Bit · 2⁴ = 16 Werte</div>
+      <div class="nibbles">
+        <div class="nibble">
+          <div class="bits"><span>0</span><span>1</span><span>0</span><span>0</span></div>
+          <div class="meta">= 4 (dez)</div>
+        </div>
+        <div class="nibble">
+          <div class="bits"><span>1</span><span>1</span><span>0</span><span>1</span></div>
+          <div class="meta">= 13 (dez)</div>
+        </div>
+      </div>
+    </div>
+
+    <div class="split">
+      <div class="arrow"></div>
+      <div class="arrow"></div>
+    </div>
+
+    <!-- Level 3 -->
+    <div class="level">
+      <div class="label">2 Hex-Ziffern · Symbole 0–F</div>
+      <div class="hex-digits">
+        <div class="hex-digit">
+          <div class="digit">4</div>
+          <div class="meta">Nibble → 1 Ziffer</div>
+        </div>
+        <div class="hex-digit">
+          <div class="digit">D</div>
+          <div class="meta">13 → D</div>
+        </div>
+      </div>
+    </div>
+
+    <div class="result">
+      <code>01001101</code> (bin) &nbsp;=&nbsp; <code>4D</code> (hex) &nbsp;=&nbsp; <strong>77</strong> (dez) &nbsp;=&nbsp; <strong>"M"</strong> (ASCII)
+    </div>
+
+    <div class="math">
+      <span class="eq">16 × 16 = 256</span> &nbsp;·&nbsp; <span class="eq">2⁴ × 2⁴ = 2⁸</span> &nbsp;·&nbsp; Darum passt Hex so gut zu Bytes.
+    </div>
+  </div>
+</body>
+</html>
+</content>
+</invoke>

slides/223015b/assets/demos/hex-dec-table.html

@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Hex → Dezimal</title>
+<style>
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; }
+  body { padding: 28px; }
+  h1 { text-align: center; margin: 0 0 4px; font-size: 1.6rem; color: #1a1a2e; }
+  .sub { text-align: center; color: #6b7280; margin-bottom: 18px; font-size: 0.95rem; }
+  table { border-collapse: collapse; margin: 0 auto; font-variant-numeric: tabular-nums; }
+  th, td { border: 1px solid #cbd5e1; padding: 7px 10px; text-align: center; font-size: 0.95rem; }
+  thead th { background: #1a1a2e; color: #fff; }
+  tbody th { background: #334155; color: #fff; font-weight: 600; }
+  tbody td.ascii { background: #f3f4f6; }
+  tbody td.nonascii { background: #fff; color: #6b7280; }
+  .corner { background: #0f0f23; color: #d63384; }
+  .legend { display: flex; justify-content: center; gap: 24px; margin-top: 16px; font-size: 0.9rem; color: #374151; }
+  .sw { display: inline-block; width: 14px; height: 14px; border: 1px solid #cbd5e1; vertical-align: middle; margin-right: 6px; }
+  .example { margin: 20px auto 0; max-width: 720px; padding: 14px 18px; background: #fef3f8; border-left: 4px solid #d63384; border-radius: 4px; font-size: 1rem; color: #1a1a2e; }
+  code { background: #1a1a2e; color: #d63384; padding: 2px 6px; border-radius: 3px; font-family: ui-monospace, monospace; font-weight: 700; }
+</style>
+</head>
+<body>
+  <h1>Hex → Dezimal</h1>
+  <div class="sub">Dezimalwert = (Zeile × 16) + Spalte</div>
+  <table>
+    <thead>
+      <tr>
+        <th class="corner">×16 / +</th>
+        <th>0</th><th>1</th><th>2</th><th>3</th><th>4</th><th>5</th><th>6</th><th>7</th>
+        <th>8</th><th>9</th><th>A <small style="opacity:.7;font-weight:400">(10)</small></th><th>B <small style="opacity:.7;font-weight:400">(11)</small></th><th>C <small style="opacity:.7;font-weight:400">(12)</small></th><th>D <small style="opacity:.7;font-weight:400">(13)</small></th><th>E <small style="opacity:.7;font-weight:400">(14)</small></th><th>F <small style="opacity:.7;font-weight:400">(15)</small></th>
+      </tr>
+    </thead>
+    <tbody>
+    </tbody>
+  </table>
+
+  <div class="legend">
+    <span><span class="sw" style="background:#f3f4f6"></span>ASCII (0–127)</span>
+    <span><span class="sw" style="background:#fff"></span>Non-ASCII (128–255)</span>
+  </div>
+
+  <div class="example">
+    <strong>Beispiel:</strong> <code>4D</code> → Zeile <code>4</code> × 16 + Spalte <code>D</code> = 64 + 13 = <strong>77</strong> (= "M" in ASCII)
+  </div>
+
+<script>
+  const rows = '0123456789ABCDEF';
+  const tb = document.querySelector('tbody');
+  for (let r = 0; r < 16; r++) {
+    const tr = document.createElement('tr');
+    const th = document.createElement('th');
+    th.innerHTML = r >= 10 ? rows[r] + ' <small style="opacity:.7;font-weight:400">('+r+')</small>' : rows[r];
+    tr.appendChild(th);
+    for (let c = 0; c < 16; c++) {
+      const td = document.createElement('td');
+      const v = r*16 + c;
+      td.textContent = v;
+      td.className = v <= 127 ? 'ascii' : 'nonascii';
+      tr.appendChild(td);
+    }
+    tb.appendChild(tr);
+  }
+</script>
+</body>
+</html>

slides/223015b/assets/demos/three-views.html

@@ -0,0 +1,120 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Dieselben Byte — drei Perspektiven</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --border: #cbd5e1;
+    --bg-soft: #f8fafc;
+    --magic: #ef4444;
+    --format: #2563eb;
+    --transport: #16a34a;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 24px 28px; }
+  h1 { text-align: center; margin: 0 0 4px; font-size: 1.55rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 18px; font-size: 0.95rem; }
+
+  .stage { display: flex; flex-direction: column; gap: 14px; align-items: stretch; max-width: 1080px; margin: 0 auto; }
+
+  .row { display: grid; grid-template-columns: 200px 1fr; gap: 14px; align-items: center; }
+  .label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; text-align: right; white-space: nowrap; }
+  .label small { display: block; font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--muted); margin-top: 2px; font-size: 0.8em; white-space: nowrap; }
+
+  .panel { padding: 14px 16px; border: 2px solid var(--border); border-radius: 8px; background: var(--bg-soft); }
+  .panel.bin { background: #0f0f23; color: #fff; border-color: var(--dark); }
+  .panel.bin code { color: #e5e7eb; }
+  .mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 1.1rem; font-weight: 700; letter-spacing: 0.02em; word-break: break-all; line-height: 1.5; }
+
+  .hex-bytes { display: flex; flex-wrap: wrap; gap: 8px; }
+  .hex-byte { background: #fff; border: 1px solid var(--border); border-radius: 4px; padding: 4px 10px; font-family: ui-monospace, monospace; font-size: 1.15rem; font-weight: 700; }
+
+  .semantic { display: flex; gap: 6px; flex-wrap: wrap; align-items: stretch; }
+  .group { display: flex; flex-direction: column; gap: 4px; padding: 8px 10px; border-radius: 6px; min-width: 70px; }
+  .group .bytes { display: flex; gap: 4px; }
+  .group .b { background: #fff; border: 1px solid currentColor; border-radius: 3px; padding: 3px 7px; font-family: ui-monospace, monospace; font-size: 1rem; font-weight: 700; color: var(--dark); }
+  .group .tag { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
+  .group .meaning { font-size: 0.78rem; line-height: 1.3; color: var(--dark); }
+  .group.magic { background: #fee2e2; color: var(--magic); }
+  .group.format { background: #dbeafe; color: var(--format); }
+  .group.transport { background: #dcfce7; color: var(--transport); }
+
+  .arrow-row { display: flex; justify-content: center; }
+  .arrow {
+    width: 0; height: 0;
+    border-left: 11px solid transparent;
+    border-right: 11px solid transparent;
+    border-top: 14px solid var(--hl);
+  }
+
+  .footnote { margin-top: 16px; font-size: 0.88rem; color: var(--muted); text-align: center; max-width: 800px; margin-left: auto; margin-right: auto; }
+  .footnote strong { color: var(--dark); }
+</style>
+</head>
+<body>
+  <h1>Dieselben 8 Byte — drei Perspektiven</h1>
+  <div class="sub">PNG-Datei-Anfang: <code style="font-family:ui-monospace,monospace">89 50 4E 47 0D 0A 1A 0A</code></div>
+
+  <div class="stage">
+
+    <div class="row">
+      <div class="label">1 · Bitstream<small>was wirklich gespeichert wird</small></div>
+      <div class="panel bin">
+        <code class="mono">10001001&nbsp;01010000&nbsp;01001110&nbsp;01000111&nbsp;00001101&nbsp;00001010&nbsp;00011010&nbsp;00001010</code>
+      </div>
+    </div>
+
+    <div class="arrow-row"><div class="arrow"></div></div>
+
+    <div class="row">
+      <div class="label">2 · Hex<small>gruppiert in 8-Bit-Häppchen</small></div>
+      <div class="panel">
+        <div class="hex-bytes">
+          <span class="hex-byte">89</span>
+          <span class="hex-byte">50</span>
+          <span class="hex-byte">4E</span>
+          <span class="hex-byte">47</span>
+          <span class="hex-byte">0D</span>
+          <span class="hex-byte">0A</span>
+          <span class="hex-byte">1A</span>
+          <span class="hex-byte">0A</span>
+        </div>
+      </div>
+    </div>
+
+    <div class="arrow-row"><div class="arrow"></div></div>
+
+    <div class="row">
+      <div class="label">3 · Bedeutung<small>was die Byte sagen</small></div>
+      <div class="panel">
+        <div class="semantic">
+          <div class="group magic">
+            <div class="bytes"><span class="b">89</span></div>
+            <div class="tag">Magic Byte</div>
+            <div class="meaning">&gt; 127 → "Ich bin Binär, kein Text"</div>
+          </div>
+          <div class="group format">
+            <div class="bytes"><span class="b">50</span><span class="b">4E</span><span class="b">47</span></div>
+            <div class="tag">Format-Kürzel</div>
+            <div class="meaning">P · N · G (ASCII) → "PNG-Datei"</div>
+          </div>
+          <div class="group transport">
+            <div class="bytes"><span class="b">0D</span><span class="b">0A</span><span class="b">1A</span><span class="b">0A</span></div>
+            <div class="tag">Transport-Schutz</div>
+            <div class="meaning">CR · LF · EOF · LF → erkennt kaputte Übertragung</div>
+          </div>
+        </div>
+      </div>
+    </div>
+
+  </div>
+
+  <div class="footnote">
+    Byte ändern sich nicht — nur unsere <strong>Brille</strong>. Bitstream zeigt das <em>was</em>, Hex das <em>wie kompakt</em>, Bedeutung das <em>warum</em>.
+  </div>
+</body>
+</html>

slides/223015b/assets/demos/why-8-bit.html

@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Warum 8 Bit? Adressierung im Speicher</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --border: #cbd5e1;
+    --bg-soft: #f8fafc;
+    --bad: #ef4444;
+    --good: #16a34a;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 24px 28px; }
+  h1 { text-align: center; margin: 0 0 4px; font-size: 1.55rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 22px; font-size: 0.95rem; }
+
+  .stage { display: flex; flex-direction: column; align-items: center; gap: 18px; max-width: 1100px; margin: 0 auto; }
+
+  .ram-wrap { display: flex; gap: 18px; align-items: stretch; }
+
+  .ram {
+    display: grid;
+    grid-template-columns: 90px 90px 230px;
+    border: 2px solid var(--dark);
+    border-radius: 8px;
+    overflow: hidden;
+    background: var(--bg-soft);
+  }
+  .ram .head {
+    background: var(--dark); color: #fff; padding: 8px 10px;
+    font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; text-align: center;
+  }
+  .ram .cell {
+    border-top: 1px solid var(--border); padding: 10px 12px;
+    font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 1.05rem; font-weight: 700;
+    text-align: center; background: #fff;
+  }
+  .ram .cell.addr { color: var(--muted); background: var(--bg-soft); }
+  .ram .cell.bin  { font-size: 0.95rem; letter-spacing: 0.05em; }
+  .ram .row.cur .cell { background: #fef3f8; color: var(--hl); }
+
+  .pointer-side { display: flex; flex-direction: column; gap: 12px; padding-top: 36px; }
+  .ptr-block { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 6px; font-family: ui-monospace, monospace; font-weight: 700; font-size: 0.95rem; }
+  .ptr-block.ok  { background: #dcfce7; color: var(--good); border: 2px solid var(--good); }
+  .ptr-block.bad { background: #fee2e2; color: var(--bad); border: 2px dashed var(--bad); }
+  .ptr-block.between {
+    background: #fff; color: var(--bad); border: 2px dashed var(--bad);
+    margin: -12px 0 -12px 0;
+    transform: translateX(-10px);
+  }
+  .ptr-block .ico { font-size: 1.3rem; line-height: 1; }
+
+  .legend {
+    display: flex; gap: 22px; padding: 12px 16px; border-top: 1px solid var(--border);
+    font-size: 0.9rem; color: var(--dark);
+  }
+  .legend .row { display: flex; align-items: center; gap: 6px; }
+  .legend .swatch { width: 14px; height: 14px; border-radius: 3px; }
+
+  .conclusion {
+    margin-top: 6px;
+    padding: 14px 22px;
+    background: #fef3f8;
+    border-left: 4px solid var(--hl);
+    border-radius: 4px;
+    font-size: 1rem;
+    text-align: center;
+    max-width: 760px;
+  }
+  .conclusion strong { color: var(--hl); }
+  .conclusion code { background: var(--dark); color: #f8f8f8; padding: 1px 6px; border-radius: 3px; font-family: ui-monospace, monospace; }
+</style>
+</head>
+<body>
+  <h1>Warum 8 Bit? Speicher-Adressierung</h1>
+  <div class="sub">CPU adressiert <strong>byteweise</strong> — halbe Byte existieren nicht.</div>
+
+  <div class="stage">
+
+    <div class="ram-wrap">
+
+      <div class="ram">
+        <div class="head">Adresse</div>
+        <div class="head">Hex</div>
+        <div class="head">Bit (was im Speicher steht)</div>
+
+        <div class="cell addr">0x0000</div>
+        <div class="cell">48</div>
+        <div class="cell bin">01001000</div>
+
+        <div class="cell addr">0x0001</div>
+        <div class="cell">65</div>
+        <div class="cell bin">01100101</div>
+
+        <div class="cell addr">0x0002</div>
+        <div class="cell">6C</div>
+        <div class="cell bin">01101100</div>
+
+        <div class="cell addr">0x0003</div>
+        <div class="cell">6C</div>
+        <div class="cell bin">01101100</div>
+
+        <div class="cell addr">0x0004</div>
+        <div class="cell">6F</div>
+        <div class="cell bin">01101111</div>
+
+        <div class="cell addr">0x0005</div>
+        <div class="cell">21</div>
+        <div class="cell bin">00100001</div>
+      </div>
+
+      <div class="pointer-side">
+        <div class="ptr-block ok"><span class="ico">→</span><span>read 0x0000 ✓</span></div>
+        <div class="ptr-block bad"><span class="ico">✗</span><span>read 0x0000.5 — gibt's nicht</span></div>
+        <div class="ptr-block ok"><span class="ico">→</span><span>read 0x0001 ✓</span></div>
+        <div class="ptr-block bad"><span class="ico">✗</span><span>read 0x0001.5 — gibt's nicht</span></div>
+        <div class="ptr-block ok"><span class="ico">→</span><span>read 0x0002 ✓</span></div>
+        <div class="ptr-block ok" style="opacity:0.4"><span class="ico">→</span><span>...</span></div>
+      </div>
+
+    </div>
+
+    <div class="conclusion">
+      <strong>Byte = kleinste adressierbare Einheit.</strong><br>
+      Speichercontroller, Bus und CPU sind alle auf 8-Bit-Häppchen ausgelegt.<br>
+      Einzelne Bit lesen → muss erst <code>byte = mem[addr]</code>, dann mit <code>byte &amp; 0b1000_0000</code> Bit isolieren.
+    </div>
+
+  </div>
+</body>
+</html>

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