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

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

@@ -12,6 +12,7 @@ This project builds presentation decks for Marp, supporting multiple courses.
 - 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
 
@@ -34,8 +35,9 @@ build/                  # Generated output (gitignored)
 ## Build Commands
 
 ```bash
-make dev-b          # Dev server 223015b (port 1311)
+make dev            # Marp live server all courses (port 1312, HMR)
-make dev-c          # Dev server 223015c (port 1312)
+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
@@ -48,10 +50,7 @@ make deploy         # Deploy all (ASK FIRST!)
 ## Nix Flake Commands
 
 ```bash
-nix develop                           # Dev shell with all tools
+nix develop                           # Dev shell with all tools (node 22, npm, make)
-nix run .#qr -- "https://example.com" # Generate QR code
-nix run .#qr-slides -- 223015b        # QR for course
-nix run .#optimize-img -- <path>      # Optimize images
 ```
 
 ## Code Style Guidelines

Makefile

@@ -7,19 +7,13 @@
 COURSES = 223015b 223015c
 SLIDES_DIR = slides
 
-# Port configuration (index starts at BASE_PORT, courses increment from there)
-BASE_PORT = 1310
-INDEX_PORT = $(BASE_PORT)
-
 # Course-specific settings
 223015b_NAME = Dateiformate, Schnittstellen, Speichermedien
-223015b_PORT = 1311
+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_KAPITEL = 00-intro 01-grundlagen-text-audio 02-bild-audio-video 03-speichermedien-schnittstellen 04-distribution-apis-zukunft 05-vertiefung-offene-fragen klausur
 223015b_DEPLOY_PATH = /home/tengo/html/hdm/223015b
 
 223015c_NAME = Internettechnologien
-223015c_PORT = 1312
+223015c_KAPITEL = 01-geschichte-grundlagen-html 02-netzwerke-protokolle-css 03-interaktivitaet-javascript klausurfolien klausurfragen
-223015c_KAPITEL = 01-geschichte-grundlagen-html 02-netzwerke-protokolle-css 03-interaktivitaet-javascript klausur
 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         - Marp live server all courses (port 1312, HMR)"
-	@echo "  make dev-b       - Dev server for 223015b (port 1312)"
+	@echo "  make dev-b       - Marp live server 223015b (port 1313, HMR)"
-	@echo "  make dev-c       - Dev server for 223015c (port 1313)"
+	@echo "  make dev-c       - Marp live server 223015c (port 1314, HMR)"
 	@echo ""
 	@echo "Build:"
 	@echo "  make build       - Build all courses"
@@ -43,7 +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 klausur slides"
+	@echo "  make klausur     - Extract klausurfolien slides"
 	@echo ""
 	@echo "Tools:"
 	@echo "  make qr URL=...  - Generate QR code for URL"
@@ -63,24 +57,20 @@ 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 $(223015b_PORT)..."
+	@./scripts/dev-server.sh 223015b 1313
-	@echo "Open: http://localhost:$(223015b_PORT)"
-	PORT=$(223015b_PORT) npx @marp-team/marp-cli --server $(SLIDES_DIR)/223015b/
 
 dev-c:
-	@echo "Starting 223015c dev server on port $(223015c_PORT)..."
+	@./scripts/dev-server.sh 223015c 1314
-	@echo "Open: http://localhost:$(223015c_PORT)"
+
-	PORT=$(223015c_PORT) npx @marp-team/marp-cli --server $(SLIDES_DIR)/223015c/
+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
@@ -158,7 +148,7 @@ klausur-c:
 	@./scripts/extract-klausur.sh 223015c
 
 klausur: klausur-b klausur-c
-	@echo "Klausur slides extracted for all courses!"
+	@echo "Klausurfolien slides extracted for all courses!"
 
 # QR Code generation (uses nix-shell)
 qr:
@@ -198,7 +188,8 @@ 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:#1e5f8a}.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}.section-title{font-size:1rem;font-weight:600;color:#86868b;margin-top:2.5rem;margin-bottom:.75rem}.references{display:flex;flex-direction:column;gap:.75rem}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}.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:.75rem;font-size:.85rem;color:#86868b}</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 Kapitel · 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 Kapitel · Modul "Technik 1"</span></a></div><h2 class="section-title">Referenzen</h2><div class="references"><a class="course" href="https://codecrispi.es/"><span class="course-label">Plattform</span><div class="course-title">Code Crispies</div><span class="course-info">Selbstlernplattform</span></a></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>' > build/index.html
+	@mkdir -p build
+	@./scripts/generate-root-index.sh
 
 # Deploy
 define deploy_course

README.md

@@ -27,10 +27,12 @@ build/                # Generated output (gitignored)
 ## Development
 
 ```bash
-# Start dev servers (hot reload)
+# Start development server (hot reload)
-make dev              # All courses + index
+make dev              # Single server for all courses (port 3000)
-make dev-b            # 223015b only (port 1311)
+
-make dev-c            # 223015c only (port 1312)
+# Access individual courses:
+# 223015b: http://localhost:3000/223015b/
+# 223015c: http://localhost:3000/223015c/
 ```
 
 ## Build
@@ -43,7 +45,7 @@ make html             # HTML only
 make pdf              # PDF only
 ```
 
-## Klausur Slides
+## Klausur Folien
 
 Extract exam-relevant slides (marked with `<!-- _class: klausur -->`) into a single file:
 
@@ -53,7 +55,7 @@ make klausur-b        # 223015b only
 make klausur-c        # 223015c only
 ```
 
-Output: `slides/<course>/klausur.md`
+Output: `slides/<course>/klausurfolien.md`
 
 The generated file includes:
 - A title slide per kapitel for orientation

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};
+        pkgs = import nixpkgs { inherit 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!"
-        '';
-
       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 "HdM Slides - run 'make' for available commands"
-            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 ""
           '';
         };
-
-        # 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": "PORT=3000 marp --server --allow-local-files slides/",
-    "dev:c": "PORT=1313 marp --server --allow-local-files courses/223015c/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
+# Development server for HdM slides
-# Starts index server + marp servers for each course
+# 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
 SLIDES_DIR="slides"
-DEV_INDEX_DIR=".dev-index"
+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
+# Kill existing process on our port only
-cleanup() {
+kill_port() {
-    echo -e "\n${RED}Shutting down servers...${NC}"
+    fuser -k "$DEV_PORT/tcp" 2>/dev/null || true
-    kill $PID_INDEX $PID_B $PID_C 2>/dev/null || true
+    sleep 0.5
-    exit 0
-}
-
-# Kill existing processes on our ports
-kill_existing() {
-    echo -e "${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 > "$DEV_INDEX_DIR/index.html" << 'EOF'
-<!DOCTYPE html>
-<html lang="de">
-<head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width,initial-scale=1">
-  <title>HdM Slides - Dev</title>
-  <style>
-    *{box-sizing:border-box;margin:0;padding:0}
-    body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,sans-serif;max-width:720px;margin:0 auto;padding:3rem 1.5rem;background:#fafafa;color:#1d1d1f;line-height:1.5}
-    h1{font-size:2rem;font-weight:600;letter-spacing:-0.02em;margin-bottom:.5rem}
-    .subtitle{color:#86868b;font-size:1rem}
-    .courses{margin-top:2rem;display:flex;flex-direction:column;gap:.75rem}
-    a.course{display:block;background:#fff;border-radius:12px;padding:1.5rem;text-decoration:none;color:inherit;box-shadow:0 1px 3px rgba(0,0,0,0.08);transition:all .2s ease;cursor:pointer}
-    a.course:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.12)}
-    .course-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
-    .course-b .course-label{color:#1e5f8a}
-    .course-c .course-label{color:#d63384}
-    .course-title{font-size:1.15rem;font-weight:500;color:#1d1d1f;margin:.25rem 0}
-    .course-info{font-size:.85rem;color:#86868b}
-  </style>
-</head>
-<body>
-  <h1>HdM Slides</h1>
-  <p class="subtitle">Development Server</p>
-  <div class="courses">
-EOF
-    echo "    <a class=\"course course-b\" href=\"http://localhost:$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
 }
 
 # Main
-trap cleanup SIGINT SIGTERM
+trap 'echo -e "\n${RED}Shutting down...${NC}"; kill 0; exit 0' SIGINT SIGTERM
 
-kill_existing
+kill_port
-generate_index
 
-echo -e "${GREEN}Starting development servers...${NC}"
+if [ -n "$COURSE" ]; then
-echo ""
+    SERVE_DIR="$SLIDES_DIR/$COURSE"
-echo -e "  Index:    ${BLUE}http://localhost:$INDEX_PORT${NC}"
+    echo -e "${GREEN}Marp dev server${NC} · ${BLUE}$COURSE${NC}"
-echo -e "  223015b:  ${BLUE}http://localhost:$COURSE_B_PORT${NC}"
+else
-echo -e "  223015c:  ${BLUE}http://localhost:$COURSE_C_PORT${NC}"
+    SERVE_DIR="$SLIDES_DIR"
-echo ""
+    echo -e "${GREEN}Marp dev server${NC} · ${BLUE}all courses${NC}"
-echo -e "Press ${RED}Ctrl+C${NC} to stop all servers"
+fi
+
+echo -e "  ${BLUE}http://localhost:$DEV_PORT${NC}"
+echo -e "  ${BLUE}$SERVE_DIR/${NC}"
 echo ""
 
-# Start servers
+PORT=$DEV_PORT exec npx @marp-team/marp-cli -c marp.config.js --server "$SERVE_DIR/"
-python3 -m http.server $INDEX_PORT --directory "$DEV_INDEX_DIR" &
-PID_INDEX=$!
-
-PORT=$COURSE_B_PORT npx @marp-team/marp-cli --server "$SLIDES_DIR/223015b/" &
-PID_B=$!
-
-sleep 3  # Stagger starts to avoid WebSocket port collision
-
-PORT=$COURSE_C_PORT npx @marp-team/marp-cli --server "$SLIDES_DIR/223015c/" &
-PID_C=$!
-
-# Wait for any process to exit
-wait

scripts/extract-klausur.sh

@@ -1,19 +1,19 @@
 #!/usr/bin/env bash
 # Extract klausur-relevant slides from all kapitel
 # Usage: ./extract-klausur.sh <course_id>
-# Output: slides/<course>/klausur.md
+# Output: slides/<course>/klausurfolien.md
 
 set -e
 
 COURSE="${1:-223015b}"
 SLIDES_DIR="slides/$COURSE"
-OUTPUT_FILE="$SLIDES_DIR/klausur.md"
+OUTPUT_FILE="$SLIDES_DIR/klausurfolien.md"
 
-# Find the first kapitel file (01-*.md) to copy styles from
+# Find the first kapitel file (00-intro.md or 01-*.md) to copy styles from
-FIRST_KAPITEL=$(ls "$SLIDES_DIR"/01-*.md 2>/dev/null | head -1)
+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 01-*.md file found in $SLIDES_DIR"
+  echo "Error: No 00-intro.md or 01-*.md file found in $SLIDES_DIR"
   exit 1
 fi
 
@@ -57,7 +57,7 @@ awk '
 ' "$FIRST_KAPITEL" >> "$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 klausur | sort); do
+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*//')
 

scripts/generate-index.sh

@@ -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: $ACCENT_COLOR;
     }
+    .course-heading {
+      font-size: 1.25rem;
+      font-weight: 500;
+      color: #1d1d1f;
+      margin-bottom: 0.25rem;
+    }
     .subtitle {
       color: #86868b;
       font-size: 0.95rem;
@@ -77,7 +101,8 @@ cat > "$BUILD_DIR/index.html" << HEADER
       font-size: 0.875rem;
       margin-top: 0.25rem;
     }
-    .kapitel {
+    /* Use the .termine wrapper and add a gap between cards */
+    .termine {
       margin-top: 1.5rem;
       display: flex;
       flex-direction: column;
@@ -93,6 +118,7 @@ cat > "$BUILD_DIR/index.html" << HEADER
       grid-template-columns: 1fr auto auto;
       align-items: center;
       gap: 1rem;
+      padding: 0; /* inner padding handled by kapitel-link */
     }
     .kapitel-card:hover {
       transform: translateY(-2px);
@@ -105,6 +131,8 @@ cat > "$BUILD_DIR/index.html" << HEADER
       color: inherit;
       grid-column: 1;
     }
+    /* 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;
@@ -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: $ACCENT_COLOR;
       color: #fff;
-      margin-right: 0.5rem;
     }
     .btn-slides:hover {
       filter: brightness(1.1);
@@ -147,9 +175,9 @@ cat > "$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 */
     .kapitel-link::after {
       content: '';
@@ -198,9 +226,11 @@ 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
@@ -216,7 +246,7 @@ for html in $(ls "$BUILD_DIR"/[0-9][0-9]-*.html 2>/dev/null | sort); do
   # 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
 
   # Handle kapitel number
@@ -228,42 +258,108 @@ for html in $(ls "$BUILD_DIR"/[0-9][0-9]-*.html 2>/dev/null | sort); do
 
   pdf_filename="${filename%.html}.pdf"
 
-  # Check if PDF exists
+  # Determine whether this topic is configured as disabled for this course
-  pdf_link=""
+  disabled_full=false
-  if [[ -f "$BUILD_DIR/$pdf_filename" ]]; then
+  disabled_buttons=false
-    pdf_link="<a href=\"$pdf_filename\" class=\"btn btn-pdf\">PDF</a>"
+  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 >> "$BUILD_DIR/index.html" << LINK
-    <div class="kapitel-card">
+    <div class="$card_class">
-      <a href="$filename" class="kapitel-link">
+      $link_html
-        <div class="kapitel-label">$kapitel_label</div>
+      $slides_html
-        <div class="kapitel-title">$topic</div>
+      $pdf_html
-      </a>
-      <a href="$filename" class="btn btn-slides">Folien</a>
-      $pdf_link
     </div>
 LINK
+
 done
 
-# Add klausur entry if it exists
+# Add klausurfolien entry if it exists (disabled — wird noch überarbeitet)
-if [[ -f "$BUILD_DIR/klausur.html" ]]; then
+if [[ -f "$BUILD_DIR/klausurfolien.html" ]]; then
-  pdf_link=""
+  pdf_disabled=""
-  if [[ -f "$BUILD_DIR/klausur.pdf" ]]; then
+  if [[ -f "$BUILD_DIR/klausurfolien.pdf" ]]; then
-    pdf_link="<a href=\"klausur.pdf\" class=\"btn btn-pdf\">PDF</a>"
+    pdf_disabled="<span class=\"btn btn-pdf btn-disabled\">PDF</span>"
   fi
   cat >> "$BUILD_DIR/index.html" << KLAUSUR
-    <div class="kapitel-card" style="border-left: 3px solid $ACCENT_COLOR;">
+    <div class="kapitel-card disabled" style="border-left: 3px solid $ACCENT_COLOR;">
-      <a href="klausur.html" class="kapitel-link">
+      <div class="kapitel-link">
         <div class="kapitel-label">Prüfung</div>
         <div class="kapitel-title">Klausurrelevante Folien</div>
-      </a>
+      </div>
-      <a href="klausur.html" class="btn btn-slides">Folien</a>
+      <span class="btn btn-slides btn-disabled">Folien</span>
-      $pdf_link
+      $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">
@@ -272,7 +368,7 @@ cat >> "$BUILD_DIR/index.html" << FOOTER
   </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;
+      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: 0.5rem;
+    }
+    .subtitle { color: #86868b; font-size: 1rem; }
+    .courses {
+      margin-top: 2rem;
+      display: flex;
+      flex-direction: column;
+      gap: 0.75rem;
+    }
+    .course-card {
+      position: relative;
+      background: #fff;
+      border-radius: 12px;
+      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
+      transition: all 0.2s ease;
+      display: grid;
+      grid-template-columns: 1fr auto auto;
+      align-items: center;
+      gap: 1rem;
+    }
+    .course-card:hover {
+      transform: translateY(-2px);
+      box-shadow: 0 4px 12px rgba(0,0,0,0.12);
+    }
+    .course-link {
+      display: block;
+      padding: 1.25rem 1.5rem;
+      text-decoration: none;
+      color: inherit;
+      grid-column: 1;
+    }
+    .course-link::after {
+      content: '';
+      position: absolute;
+      inset: 0;
+      border-radius: 12px;
+    }
+    .course-label {
+      font-size: 0.7rem;
+      font-weight: 600;
+      text-transform: uppercase;
+      letter-spacing: 0.05em;
+    }
+    .course-b .course-label { color: #1e5f8a; }
+    .course-c .course-label { color: #d63384; }
+    .course-title {
+      font-size: 1.15rem;
+      font-weight: 500;
+      color: #1d1d1f;
+      margin: 0.25rem 0;
+    }
+    .course-info { font-size: 0.85rem; color: #86868b; }
+    .section-title {
+      font-size: 1rem;
+      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;
+      border-top: 1px solid #e5e5e7;
+      color: #86868b;
+      font-size: 0.85rem;
+    }
+    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

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
@@ -40,11 +40,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -82,173 +84,109 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
 ---
 
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
 ![bg fit](./assets/qrcode-0.svg)
 
 ---
 
 <!-- _class: lead -->
 
-# Willkommen!
+# Herzlich willkommen!
 ## Einführung
 
 ---
 
 # Über mich
 
-**Michael Czechowski**
+**Michael Werner Czechowski**
 
-- Irgendwas mit IT, Cloud und AI
+- Systems and Platform Engineer
 - Schwerpunkte:
   - Web-Technologien, Barriere-Armut, Systemarchitektur, Open Source
 - Hintergrund:
-  - Philosophie (Uni Stuttgart) -> NO degree
+  - Philosophie (Uni Stuttgart)
-  - Wirtschafts-Informatik (Leibniz-FH) -> B.Sc.
+  - 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!**
+
 <!--
-Kurze Vorstellung
+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
-Praxisbezug betonen
+
-Fragen jederzeit willkommen
+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
 -->
 
 ---
 
-<!-- _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?
+* Wer kennt den Unterschied zwischen analog und digital?
-2) Wer kennte die 3-2-1 Regel?
+* Wer hat schon mal eine Datei von einem Format in ein anderes konvertiert?
-3) Wer weiß, was der Unterschied zwischen JPEG und PNG ist?
+* Wer hat schon mal Metadaten aus einem Foto entfernt?
-4) Wer hat schon mal mit APIs gearbeitet?
+* Wer hat schon mal ein Backup verloren?
-5) Wer weiß, was UTF-8 bedeutet?
+* Wer hat schon mal ein Backup wiederhergestellt?
-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:**
+**Kapitel:**
 
-| # | Datum | Thema |
+* 1. **Grundlagen**, Text & Audio (Bits, Bytes, Zeichenkodierung, MP3)
-|---|-------|-------|
+* 2. Bild- & Video-**Kompression** (JPEG, PNG, H.264/H.265)
-| 1 | 19.12.2025 | Bits, Bytes, Zeichenkodierung & Audio |
+* 3. **Speichermedien** & **Schnittstellen** (HDD, SSD, USB, Thunderbolt)
-| 2 | 09.01.2026 | Bild- & Video-Kompression |
+* 4. **Distribution** und Verteilung (Streaming, REST, Cloud)
-| 3 | 23.01.2026 | Speichermedien & Schnittstellen |
+* Vertiefung & offene Fragen
-| 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.
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #e3f2fd -->
+
+# Prüfungsleistung
 
 **Nach aktuellem Kenntnisstand:**
 
-* 90 min (40% Grundlagen, 40% Dateiformate, 20% AV)
+* 90 min insg. (Technik 1)
-* Schriftliche Klausur
+* Schriftliche Klausur (digital)
 * Teils offene Fragen
-* Vermutlich digital
+* Kein Coding/Programmieren
-* Kein Coding!
+* **Prüfungsrelevante Folien:**
-* **Prüfungsrelevant:** Alles in den Folien/im Skript
+  - Gestreift oder Vollton (PDF) markiert
-
-<!--
-Details können sich noch ändern
-Keine Programmieraufgaben
-Verständnisfragen, keine Auswendiglernerei
--->
-

slides/223015b/02-bild-audio-video.md

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
@@ -40,11 +40,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -68,6 +70,26 @@ section.aufgabe {
 section.aufgabe footer {
   display: none;
 }
+section.erklaerung {
+  font-size: 1.1rem;
+}
+section.erklaerung h1 {
+  font-size: 1.5rem;
+  color: #1e5f8a;
+  margin-bottom: 0.3rem;
+}
+section.erklaerung ul,
+section.erklaerung ol {
+  font-size: 1.0rem;
+  line-height: 1.4;
+}
+section.erklaerung p {
+  font-size: 1.0rem;
+  line-height: 1.4;
+}
+section.erklaerung table {
+  font-size: 0.9rem;
+}
 </style>
 
 <!-- _class: invert -->
@@ -220,6 +242,26 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# Rastergrafik – Vertiefung
+
+Ein Pixel ist die kleinste adressierbare Einheit. Bei 24-Bit-Farbtiefe speichert jeder Pixel drei 8-Bit-Werte (0–255) für Rot, Grün und Blau. Diese additive Farbmischung erzeugt 256³ = 16,7 Millionen mögliche Farbtöne.
+
+**Speicherberechnung:** `Breite × Höhe × Bytes pro Pixel`
+
+| Auflösung | Farbtiefe | Berechnung | Größe |
+|-----------|-----------|------------|-------|
+| 1920×1080 | 24 Bit (3 B) | 2.073.600 × 3 | 6,2 MB |
+| 4K (3840×2160) | 24 Bit | 8.294.400 × 3 | 24,9 MB |
+| 4K | 32 Bit (4 B) | 8.294.400 × 4 | 33,2 MB |
+
+Der Alpha-Kanal (32 Bit) speichert Transparenz als Wert von 0 (unsichtbar) bis 255 (vollständig sichtbar). PNG nutzt dies für weiche Kanten; JPEG unterstützt keinen Alpha-Kanal.
+
+---
+
 # Das Problem der Skalierung
 
 **Vergrößern:**
@@ -274,6 +316,30 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# Vektorgrafik – Vertiefung
+
+Vektorgrafiken speichern keine Pixel, sondern mathematische Beschreibungen: Koordinaten, Kurvenparameter (Bézier-Kontrollpunkte), Füllfarben, Strichstärken. Der Renderer berechnet die Pixel erst bei der Ausgabe – daher beliebig skalierbar.
+
+**Bézier-Kurven** (Pierre Bézier, 1962, für Renault-Karosserien entwickelt):
+- Definiert durch Ankerpunkte und Kontrollpunkte
+- Kubische Bézier: 2 Anker + 2 Kontrollpunkte
+- Mathematisch exakt reproduzierbar
+
+| Aspekt | Raster | Vektor |
+|--------|--------|--------|
+| Skalierung 10× | Pixel sichtbar | Perfekt scharf |
+| Foto-Realismus | Gut geeignet | Unpraktikabel |
+| Dateigröße Logo | Wächst mit Auflösung | Konstant (~5 KB) |
+| Editierbarkeit | Destruktiv | Nicht-destruktiv |
+
+**Rasterisierung:** GPU wandelt Vektordaten in Pixel um. Geschieht bei jeder Darstellung neu – deshalb ist ein 4K-Monitor schärfer als ein 1080p-Monitor bei gleichem SVG.
+
+---
+
 # Raster- und Vektorgrafiken
 
 | | Raster | Vektor |
@@ -338,6 +404,28 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# Psychovisuelle Wahrnehmung – Vertiefung
+
+Die Netzhaut enthält ~120 Mio. Stäbchen (Helligkeitswahrnehmung) aber nur ~6 Mio. Zapfen (Farbwahrnehmung). Dieses 20:1-Verhältnis erklärt, warum JPEG Farbinformationen stärker reduzieren kann als Helligkeitsinformationen.
+
+**Räumliche Frequenz** beschreibt, wie schnell sich die Helligkeit über eine Bildfläche ändert:
+- **Niedrig:** Himmel, Wand – große einheitliche Flächen
+- **Hoch:** Haare, Texturen, Schrift – schnelle Wechsel
+
+Das Auge ist ein Tiefpassfilter: Hohe Frequenzen (feine Details) werden schwächer wahrgenommen. JPEG verwirft daher zuerst die hohen Frequenzen – der Qualitätsverlust bleibt meist unsichtbar.
+
+| Biologisches Limit | Ausnutzung in JPEG |
+|-------------------|-------------------|
+| Farbauflösung ~20× geringer | Chroma Subsampling (4:2:0) |
+| Hohe Frequenzen unscharf | DCT + Quantisierung |
+| Kontrast-Maskierung | Artefakte in Texturen versteckt |
+
+---
+
 <!-- _header: '' -->
 <!-- _footer: '' -->
 
@@ -442,6 +530,34 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# Farbraumkonversion – Vertiefung
+
+RGB→YCbCr nutzt die Biologie des menschlichen Auges: 120 Mio. Stäbchen (Helligkeit) vs. nur 6 Mio. Zapfen (Farbe) – ein 20:1-Verhältnis. Die Transformation erfolgt über eine lineare Matrix:
+
+```
+Y  =  0.299·R + 0.587·G + 0.114·B
+Cb = −0.169·R − 0.331·G + 0.500·B + 128
+Cr =  0.500·R − 0.419·G − 0.081·B + 128
+```
+
+Die Gewichtung (G dominiert mit 59%) entspricht der spektralen Empfindlichkeit des Auges bei Tageslicht. Y enthält alle Schärfeinformation; Cb/Cr können reduziert werden.
+
+**Chroma Subsampling – Notation J:a:b** (bezogen auf 4×2 Pixel):
+
+| Schema | Farbdaten | Einsatz |
+|--------|-----------|---------|
+| 4:4:4 | 100% | Postproduktion, Grafik |
+| 4:2:2 | 50% | Broadcast, Pro-Video |
+| 4:2:0 | 25% | JPEG, H.264, Streaming |
+
+Bei 4:2:0 teilen sich 4 Pixel einen Farbwert, behalten aber individuelle Helligkeit → 50% Dateneinsparung bei kaum sichtbarem Unterschied.
+
+---
+
 # JPEG Schritt 2: Chroma Subsampling
 
 **Notation `J:a:b`** (bezogen auf 4×2 Pixel-Block):
@@ -623,12 +739,36 @@ KLAUSURRELEVANT:
 - Präfix-frei: Kein Code ist Anfang eines anderen
 - Häufigstes Zeichen = kürzester Code
 - Auch in ZIP, PNG, MP3 verwendet
+-->
 
 ---
 
--->
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
 
+# Huffman-Coding – Vertiefung
 
+David Huffman entwickelte 1952 als Student am MIT einen optimalen Algorithmus für präfixfreie Codes – ursprünglich als Hausaufgabe, die zur Veröffentlichung führte.
+
+**Algorithmus (Bottom-Up-Baumkonstruktion):**
+1. Alle Symbole nach Häufigkeit sortieren
+2. Die zwei seltensten Symbole zu einem Knoten kombinieren
+3. Wiederholen bis nur noch die Wurzel übrig ist
+4. Codes ablesen: links = 0, rechts = 1
+
+**Präfixfreiheit:** Kein Code ist Anfang eines anderen → sofort dekodierbar ohne Trennzeichen.
+
+| Eigenschaft | Huffman | Arithmetisch |
+|-------------|---------|--------------|
+| Einheit | Ganze Bits | Fraktionale Bits |
+| Optimalität | Optimal für ganze Bits | Näher an Entropie |
+| Geschwindigkeit | Schneller | Langsamer |
+| JPEG-Einsatz | Standard (Baseline) | Optional (selten) |
+
+JPEG verwendet zwei Huffman-Tabellen: eine für DC-Koeffizienten (Durchschnittswerte), eine für AC-Koeffizienten (Frequenzen). Die Tabellen sind im JPEG-Header gespeichert.
+
+---
 
 <!-- _class: klausur -->
 <!-- _header: '' -->
@@ -772,6 +912,28 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# WebP & AVIF – Vertiefung
+
+**WebP** entstand 2010 aus Googles VP8-Videocodec (On2 Technologies, für $133M gekauft). Statt I-Frames für Video werden sie als Einzelbilder verwendet. WebP nutzt Intra-Frame-Prediction, die benachbarte Blöcke zur Vorhersage verwendet – effizienter als JPEGs blockweise DCT.
+
+**AVIF** basiert auf dem AV1-Videocodec, entwickelt 2015–2018 von der Alliance for Open Media (Google, Apple, Netflix, Amazon, Microsoft, Mozilla). Nach dem Patent-Chaos von H.265/HEVC vereinten sich die Konkurrenten für einen lizenzfreien Standard.
+
+| Aspekt | WebP | AVIF |
+|--------|------|------|
+| Basis-Codec | VP8/VP9 | AV1 |
+| Kompression vs. JPEG | 25–35% besser | 50% besser |
+| HDR/Wide Gamut | Nein | Ja (10/12 Bit) |
+| Encoding-Geschwindigkeit | Schnell | Sehr langsam |
+| Browser-Support 2025 | 97%+ | 93%+ |
+
+**Warum JPEG dominiert:** Kameras, Bildbearbeitungssoftware und Content-Management-Systeme sind auf JPEG optimiert. Der Wechsel erfordert Infrastruktur-Updates über die gesamte Pipeline.
+
+---
+
 # Formatwahl in der Praxis
 
 | Anwendung | Format |
@@ -786,7 +948,7 @@ KLAUSURRELEVANT:
 <!--
 - Kompatibilität schlägt oft Effizienz
 - TIFF für Archivierung: Unkomprimiert oder verlustfrei
-- RAW für Fotografen: Maximale Bearbeitungsfreiheit
+- RAW für FotografInnen: Maximale Bearbeitungsfreiheit
 - Frage: "Was passiert, wenn ihr ein PNG auf Instagram hochladet?"
 -->
 
@@ -822,8 +984,8 @@ KLAUSURRELEVANT:
 - Instagram ist keine Kunstgalerie, sondern Massenplattform
 - Optimiert für Geschwindigkeit, nicht Qualität
 - Facebook, Twitter, TikTok – alle machen das
-- Tipp für Fotografen: Portfolio auf eigener Website
+- Tipp für FotografInnen: Portfolio auf eigener Website
-- Diskussion: Ist das fair? Trade-off Nutzer vs. Plattform
+- Diskussion: Ist das fair? Trade-off Nutzende vs. Plattform
 -->
 
 ---
@@ -890,6 +1052,33 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# Container vs. Codec – Vertiefung
+
+**Container** (Multiplexer-Format) organisiert mehrere Datenströme mit Timing-Informationen. Er enthält keine Kompressionslogik, sondern synchronisiert Video, Audio, Untertitel und Metadaten.
+
+**Codec** (Coder-Decoder) definiert den Kompressionsalgorithmus. Derselbe Container kann verschiedene Codecs enthalten – die Dateiendung verrät den Codec nicht.
+
+| Container | Entwicklung | Typische Codecs | Besonderheit |
+|-----------|------------|-----------------|--------------|
+| MP4 | ISO/MPEG | H.264, H.265, AAC | Web-Standard, DRM-fähig |
+| MKV | Matroska | Alle | Beliebig viele Streams, Kapitel |
+| WebM | Google | VP9, AV1, Opus | HTML5-optimiert, lizenzfrei |
+| MOV | Apple | ProRes, H.264 | Professionelle Produktion |
+
+**Metadaten im Container:**
+- Timecodes für Frame-genaue Synchronisation
+- Kapitelmarken, Thumbnails
+- Sprach-Tags für Audio/Untertitel
+- HDR-Metadaten (MaxCLL, MaxFALL)
+
+**Praktisches Problem:** Eine `.mp4`-Datei mit AV1-Codec spielt auf älteren Geräten nicht ab, obwohl sie MP4 „unterstützen" – der Hardware-Decoder fehlt für AV1.
+
+---
+
 # Gängige Container
 
 | Container | Verwendung |
@@ -1115,6 +1304,32 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# H.264/AVC – Vertiefung
+
+H.264 (2003) ermöglichte erst YouTube (2005), Netflix-Streaming (2007) und Blu-ray. Vor H.264 war MPEG-2 Standard – H.264 erreichte bei gleicher Qualität die halbe Bitrate.
+
+**Technische Innovationen:**
+- **Variable Blockgrößen:** 16×16 bis 4×4 Macroblocks (MPEG-2: nur 16×16)
+- **Intra-Prediction:** Blöcke werden aus Nachbarn vorhergesagt
+- **In-Loop Deblocking:** Filter reduziert Blockartefakte vor der Referenzierung
+- **CABAC:** Arithmetic Coding ersetzt Huffman (10–15% effizienter)
+
+| Profile | Anwendung | Max. Auflösung |
+|---------|-----------|----------------|
+| Baseline | Videotelefonie, ältere Geräte | 480p |
+| Main | Broadcast, Streaming | 1080p |
+| High | Blu-ray, professionell | 4K |
+
+**Hardware-Ubiquität:** Seit 2010 hat jedes Smartphone, jede GPU, jeder Smart-TV einen H.264-Hardware-Decoder. Encoding in Echtzeit braucht keine CPU – das ermöglichte erst mobiles Video-Streaming und Videotelefonie.
+
+**Patent-Pool (MPEG-LA):** ~2.000 Patente von 30+ Unternehmen. Endnutzungs-Streaming ist lizenzfrei; Hardware-Hersteller zahlen ~$0,20/Gerät.
+
+---
+
 # Das Patent-Problem
 
 **H.264 ist nicht frei**
@@ -1132,7 +1347,7 @@ KLAUSURRELEVANT:
 <!--
 - MPEG-LA = Licensing Authority
 - Firefox weigerte sich lange, H.264 zu unterstützen
-- "Free to View" gilt nur für Endnutzer-Streaming
+- "Free to View" gilt nur für Endnutzungs-Streaming
 - Diskussion: Sollten Standards patent-frei sein?
 -->
 
@@ -1221,6 +1436,29 @@ KLAUSURRELEVANT:
 
 ---
 
+<!-- _class: erklaerung -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+# AV1 – Vertiefung
+
+Die **Alliance for Open Media** (2015) vereinte Konkurrenten nach dem Patent-Chaos von H.265/HEVC. Drei separate Patent-Pools (MPEG-LA, HEVC Advance, Velos Media) machten H.265-Lizenzierung unberechenbar – die Industrie wollte einen garantiert lizenzfreien Standard.
+
+**Gründungsmitglieder:** Google, Mozilla, Cisco, Netflix, Amazon, Microsoft. Apple trat 2018 bei – historisch, da Apple sonst eigene Standards bevorzugt.
+
+| Technische Innovation | Beschreibung |
+|----------------------|--------------|
+| Superblocks | Bis 128×128 Pixel (H.264: max 16×16) |
+| Prediction Modes | 56 Intra-Modi (H.264: 9) |
+| Transform | 10 verschiedene Transformtypen |
+| Film Grain Synthesis | Filmkorn wird als Parameter übertragen |
+
+**Encoding-Performance:** Software-Encoding ist 50–200× langsamer als H.264. Erst Hardware-Encoder (Intel ab Gen 12, NVIDIA RTX 40, Apple M3) machen Echtzeit-Encoding praktikabel.
+
+**Adoption 2025:** YouTube und Netflix nutzen AV1 für 4K/8K-Streams. 2024 gewann AV1 einen Emmy für technische Innovation – offene Standards können Industriestandard werden.
+
+---
+
 <!-- _header: '' -->
 <!-- _footer: 'https://blog.mozilla.org/en/mozilla/av1-video-codec-wins-emmy/' -->
 

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

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
@@ -40,11 +40,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -68,6 +70,26 @@ section.aufgabe {
 section.aufgabe footer {
   display: none;
 }
+section.erklaerung {
+  font-size: 1.1rem;
+}
+section.erklaerung h1 {
+  font-size: 1.5rem;
+  color: #1e5f8a;
+  margin-bottom: 0.3rem;
+}
+section.erklaerung ul,
+section.erklaerung ol {
+  font-size: 1.0rem;
+  line-height: 1.4;
+}
+section.erklaerung p {
+  font-size: 1.0rem;
+  line-height: 1.4;
+}
+section.erklaerung table {
+  font-size: 0.9rem;
+}
 </style>
 
 <!-- _class: invert -->
@@ -82,7 +104,7 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
@@ -132,7 +154,7 @@ 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 Konsumenten seit Jahrzehnten
+Verwirrung für KonsumentInnen seit Jahrzehnten
 ISO/IEC 80000-13: Definiert KiB, MiB, GiB, TiB (2008)
 -->
 
@@ -235,6 +257,29 @@ 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
@@ -484,6 +529,30 @@ Warum 1 Offsite?
 
 ---
 
+<!-- _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):**
@@ -523,7 +592,7 @@ Voll: Langsamstes Backup, schnellste Wiederherstellung
 
 <!--
 Time Machine: Stündliche Snapshots, APFS-Integration
-Veeam: Enterprise-Level, kostenlose Endnutzer-Version
+Veeam: Enterprise-Level, kostenlose Privatversion
 rsync: Unix-Klassiker, extrem effizient
 Borg: Deduplizierung + Verschlüsselung
 -->

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

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
@@ -40,11 +40,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -83,7 +85,7 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
@@ -158,7 +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
 
@@ -218,7 +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"**
 
@@ -250,7 +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!)
 
@@ -275,7 +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:**
@@ -347,14 +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
+Last verteilt sich auf alle Teilnehmenden
-Je mehr User, desto schneller (umgekehrt zu Client-Server!)
+Je mehr Nutzende, desto schneller (umgekehrt zu Client-Server!)
 Zensur-resistent: Kein Single Point of Failure
 Rechtliche Grauzone: Technologie neutral, aber oft illegal genutzt
 -->
@@ -1021,8 +1023,8 @@ Privacy-Albtraum
 
 **Beispiele:**
 - **Foto:** Kamera, Datum, GPS, Belichtung
-- **MP3:** Künstler, Album, Jahr, Genre, Cover
+- **MP3:** KünstlerInnen, Album, Jahr, Genre, Cover
-- **PDF:** Autor, Datum, Software
+- **PDF:** AutorIn, Datum, Software
 - **E-Mail:** Absender, Empfänger, Zeitstempel
 
 **Warum wichtig?**
@@ -1178,7 +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)
 
@@ -1237,7 +1239,7 @@ Versteckte Informationen sichtbar
 **PDF-Metadaten (XMP):**
 
 **Gespeichert:**
-- Titel, Autor, Betreff, Keywords
+- Titel, AutorIn, Betreff, Keywords
 - Erstellungsdatum, Änderungsdatum
 - Software, **Company** (aus Office-Lizenz!)
 
@@ -1598,7 +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):**
@@ -1636,7 +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!)
@@ -1645,7 +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
 -->

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

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
@@ -40,11 +40,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -83,7 +85,7 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015b/](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>

slides/223015b/assets/grayscale-gradient.svg

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+<rect x="2540" y="0" width="10" height="1440" fill="rgb(1,1,1)"/>
+<rect x="2550" y="0" width="10" height="1440" fill="rgb(0,0,0)"/>
+</svg>

slides/223015b/assets/grayscale-zoom.svg

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+<rect width="1920" height="1080" fill="#ffffff"/>
+<text x="960.0" y="100" text-anchor="middle" font-family="sans-serif" font-size="54" fill="#1a1a2e" font-weight="bold">Zoom: die 16 hellsten Abstufungen</text>
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+<text x="960.0" y="1020" text-anchor="middle" font-family="sans-serif" font-size="28" fill="#4a4a6a" font-style="italic">jede Stufe = Unterschied von 1/255 ≈ 0,4% Helligkeit</text>
+</svg>

slides/223015b/klausurfolien.md

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Dateiformate, Schnittstellen, Speichermedien & Distributionswege (223015b)"
-footer: "Michael Czechowski – HdM Stuttgart"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 <style>
@@ -39,11 +39,13 @@ pre code {
   color: inherit;
 }
 code {
-  background: #1a1a2e;
+  background: #0f0f23;
-  color: #5fb3e4;
   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);
 }
@@ -92,6 +94,8 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
+**Sommersemester 2026**
+
 [https://librete.ch/hdm/223015b/](https://librete.ch/hdm/223015b/)
 
 ---
@@ -110,7 +114,7 @@ Hochschule der Medien Stuttgart
 | **Formate** | ZIP, PNG, FLAC, GIF | JPEG, MP3, H.264/H.265 |
 
 **Faustregel:**
-- Medien für Endnutzer → Lossy oft akzeptabel
+- Medien für EndnutzerInnen → Lossy oft akzeptabel
 - Quellmaterial, Code, Archive → Lossless nötig
 
 <!--
@@ -208,13 +212,13 @@ VERGLEICH: SSD ~$50/TB, HDD ~$15/TB, LTO ~$5/TB
 ### Distribution: physisch (Kauf, Verleih, Kopie)
 
 - **Text**
-  - Bücher, Zeitungen, Zeitschriften, Lochkarten
+    - Bücher, Zeitungen, Zeitschriften, Lochkarten
 - **Bild**
-  - Fotografie (Negativ, Dia, Polaroid), Mikrofilm
+    - Fotografie (Negativ, Dia, Polaroid), Mikrofilm
 - **Audio:**
-  - Schallplatte (Vinyl, Schellack), Tonband, Musikkassette
+    - Schallplatte (Vinyl, Schellack), Tonband, Musikkassette
 - **Video:**
-  - Film (35mm, Super 8), VHS, Betamax
+    - Film (35mm, Super 8), VHS, Betamax
 
 
 ---
@@ -227,13 +231,13 @@ VERGLEICH: SSD ~$50/TB, HDD ~$15/TB, LTO ~$5/TB
 ### Distribution: Datenträger (CD, USB), Download, Streaming, P2P
 
 - **Text**
-  - E-Book (PDF, EPUB), Dokumente (TXT, DOCX)
+    - E-Book (PDF, EPUB), Dokumente (TXT, DOCX)
 - **Bild**
-  - Digitalfoto (JPEG, PNG, RAW, WebP, GIF)
+    - Digitalfoto (JPEG, PNG, RAW, WebP, GIF)
 - **Audio**
-  - Audiodatei (MP3, FLAC, WAV, AAC, OGG)
+    - Audiodatei (MP3, FLAC, WAV, AAC, OGG)
 - **Video**
-  - Videodatei (MP4, MKV, AVI, WebM)
+    - Videodatei (MP4, MKV, AVI, WebM)
 
 
 ---
@@ -245,13 +249,13 @@ VERGLEICH: SSD ~$50/TB, HDD ~$15/TB, LTO ~$5/TB
 # Digitale Speichermedien
 
 - **Optische Speicher**
-  - CD, DVD, Blu-ray
+    - CD, DVD, Blu-ray
 - **Magnetische Speicher**
-  - Festplatte (HDD), Magnetband (LTO)
+    - Festplatte (HDD), Magnetband (LTO)
 - **Flash-Speicher**
-  - SSD, USB-Stick, SD-Karte
+    - SSD, USB-Stick, SD-Karte
 - **Cloud-Speicher**
-  - Dropbox, Google Drive, iCloud, AWS S3
+    - Dropbox, Google Drive, iCloud, AWS S3
 
 
 ---
@@ -277,14 +281,12 @@ Breite × Höhe × Farbtiefe (in Bytes)
 | 32 | 16,7 Mio. + Alpha | Transparenz |
 
 <!--
-BERECHNUNG: Breite × Höhe × (Farbtiefe / 8)
+KLAUSURRELEVANT:
-BEISPIEL: 1920×1080 × 24 Bit = 1920×1080×3 = 6.220.800 Bytes ≈ 6,2 MB
+- Formel: Breite × Höhe × (Farbtiefe / 8) = Bytes
-
+- Beispielrechnung: 1920 × 1080 × 3 = 6.220.800 Bytes ≈ 6,2 MB
-Farbtiefe erklärt:
+- Farbtiefe: 2^n Farben bei n Bit
-- 1 Bit: 2^1 = 2 Farben
+- 24 Bit = 8 Bit pro Kanal (R, G, B)
-- 8 Bit: 2^8 = 256 Farben
+- 32 Bit = 24 Bit + 8 Bit Alpha (Transparenz)
-- 24 Bit: 2^24 = 16.777.216 Farben (je 8 Bit für R, G, B)
-- 32 Bit: 24 Bit + 8 Bit Alpha-Kanal
 -->
 
 
@@ -306,17 +308,15 @@ Farbtiefe erklärt:
 <circle cx="50" cy="50" r="40" fill="#ff0000"/>
 ```
 
-<small>SVG beschreibt nicht jeden einzelnen Pixel im Raster, sondern deklariert wie Farben und Formen gesetzt werden.</small>
+<small>SVG beschreibt WAS gezeichnet werden soll, nicht WIE jeder Pixel aussieht.</small>
 
 <!--
-Vektorgrafiken beschreiben WAS gezeichnet werden soll.
+KLAUSURRELEVANT:
-Rastergrafiken beschreiben WIE jeder Pixel aussieht.
+- Vektor = Beschreibung (deklarativ)
-
+- Raster = Pixel für Pixel (imperativ)
-Rendering-Pipeline:
+- Rendering-Pipeline: Vektordaten → Rasterisierung → Display
-Vektordaten → Rasterisierung → Framebuffer → Display
+- Skalierung = Koordinaten multiplizieren → keine Information geht verloren
-
+- SVG = Scalable Vector Graphics (Web-Standard)
-Beim Skalieren werden einfach die Koordinaten multipliziert.
-Keine Information geht verloren.
 -->
 
 
@@ -334,18 +334,17 @@ Keine Information geht verloren.
 - Niedrige Frequenzen besser als hohe
 
 **JPEG nutzt das aus:**
-- Farbauflösung reduzieren (aber Helligkeit behalten)
+- Farbauflösung reduzieren (Helligkeit behalten)
 - Glatte Flächen effizient speichern
-- Hohe Frequenzen (Details) verwerfen
+- Hohe Frequenzen (feine Details) verwerfen
 
 <!--
-Das ist die visuelle Entsprechung zur Psychoakustik.
+KLAUSURRELEVANT:
-
+- Mehr Stäbchen (Helligkeit) als Zapfen (Farbe) im Auge
-Das Auge hat mehr Rezeptoren für Helligkeit (Stäbchen)
+- "Frequenz" = räumliche Frequenz = wie schnell ändert sich Helligkeit?
-als für Farbe (Zapfen).
+- Niedrig = langsame Änderung = große gleichmäßige Fläche
-
+- Hoch = schnelle Änderung = feine Details, Kanten
-Hohe Frequenzen = schnelle Wechsel = feine Details
+- Analogie zur Psychoakustik bei MP3 (letztes Mal)
-Niedrige Frequenzen = langsame Wechsel = große Flächen
 -->
 
 
@@ -357,24 +356,25 @@ Niedrige Frequenzen = langsame Wechsel = große Flächen
 
 ![bg right:20%](./assets/Barn-yuv.png)
 
-# JPEG: Schritt 1 – Farbraumkonversion
+# JPEG Schritt 1: Farbraumkonversion
 
-**RGB → Y'CbCr** (seltener Y'UV)
+**RGB → Y'CbCr**
 
-- **Y** = Helligkeit (Luminanz) – Was das Auge am besten sieht
+- **Y** = Helligkeit (Luminanz)
 - **Cb** = Blau-Gelb-Anteil (Chrominanz)
 - **Cr** = Rot-Grün-Anteil (Chrominanz)
 
-**Warum diese Trennung?**
+**Warum?**
-Y (Helligkeit) behält volle Auflösung.
+Y (Helligkeit) behält volle Auflösung
-Cb/Cr (Farbe) kann reduziert werden – Auge merkt es kaum.
+Cb/Cr (Farbe) kann reduziert werden
 
 <!--
-YCbCr ist wie RGB ein Tripel aus 3 Werten pro Pixel.
+KLAUSURRELEVANT:
-Der Unterschied: Statt Rot-Grün-Blau speichern wir Helligkeit + 2 Farbdifferenzen.
+- YCbCr = auch 3 Werte pro Pixel, aber anders organisiert
-
+- Statt R-G-B: Helligkeit + 2 Farbdifferenzen
-Die Umrechnung ist reversibel (mathematische Transformation).
+- Umrechnung ist reversibel (mathematische Transformation)
-Der Clou: Jetzt können wir Helligkeit und Farbe getrennt behandeln.
+- Vorteil: Helligkeit und Farbe getrennt behandelbar
+- Bild zeigt: Y (oben), Cb (Mitte), Cr (unten)
 -->
 
 
@@ -384,14 +384,14 @@ Der Clou: Jetzt können wir Helligkeit und Farbe getrennt behandeln.
 <!-- _footer: "" -->
 
 
-# JPEG: Schritt 6 – Huffman-Coding
+# JPEG Schritt 6: Huffman-Coding
 
 **Verlustfreie Kompression der Restwerte**
 
-**Idee:** Statt fester 8 Bit pro Wert → variable Bitlänge
+**Idee:** Variable Bitlänge statt fester 8 Bit
-Häufige Werte bekommen kurze Bit-Sequenzen.
+Häufige Werte → kurze Codes
 
-| Zeichen | Häufigkeit | Code (Bit-Sequenz) |
+| Zeichen | Häufigkeit | Code |
 |---------|------------|------|
 | e | 40% | `0` (1 Bit) |
 | a | 25% | `10` (2 Bit) |
@@ -400,9 +400,74 @@ Häufige Werte bekommen kurze Bit-Sequenzen.
 | u | 5% | `1111` (4 Bit) |
 
 <!--
-Huffman-Coding ist verlustfrei.
+KLAUSURRELEVANT:
-Der "Code" ist eine Bit-Sequenz, die das Zeichen eindeutig identifiziert.
+- Huffman = verlustfrei, optimal für bekannte Häufigkeiten
-Weil "e" am häufigsten vorkommt, bekommt es den kürzesten Code.
+- Präfix-frei: Kein Code ist Anfang eines anderen
+- Häufigstes Zeichen = kürzester Code
+- Auch in ZIP, PNG, MP3 verwendet
+-->
+
+
+---
+
+<!-- _header: "" -->
+<!-- _footer: "" -->
+
+<!--
+# Huffman-Coding: Beispiel
+
+**Originaltext:** `ABRACADABRA` (11 Zeichen × 8 Bit = 88 Bit)
+
+**Häufigkeitsanalyse:**
+A=5, B=2, R=2, C=1, D=1
+
+**Huffman-Baum → Codes:**
+| Zeichen | Häufigkeit | Code |
+|---------|------------|------|
+| A | 5 | `0` |
+| B | 2 | `10` |
+| R | 2 | `110` |
+| C | 1 | `1110` |
+| D | 1 | `1111` |
+
+**Codiert:** `0 10 110 0 1110 0 1111 0 10 110 0` = **23 Bit**
+**Kompression:** 88 → 23 Bit = **74% gespart**
+
+
+- Beispiel Schritt für Schritt durchrechnen
+- Warum funktioniert's? A kommt 5× vor, bekommt kürzesten Code
+- Präfix-Eigenschaft: Kein Code ist Anfang eines anderen → eindeutig dekodierbar
+- Frage: "Was passiert, wenn alle Zeichen gleich häufig sind?" → Keine Ersparnis
+- In JPEG: Nicht Buchstaben, sondern DCT-Koeffizienten werden so codiert
+-->
+
+
+---
+
+<!-- _header: "" -->
+<!-- _footer: "" -->
+
+
+# WebP & AVIF: Moderne Alternativen
+
+**WebP (Google, 2010):**
+- Lossy und Lossless
+- Transparenz und Animationen
+- 25–35% kleiner als JPEG
+
+**AVIF (2019):**
+- Basiert auf AV1-Video-Codec
+- 50% kleiner als JPEG
+- HDR-Unterstützung, patent-frei
+
+**Browser-Support 2025:** WebP universell, AVIF wächst
+
+<!--
+KLAUSURRELEVANT:
+- WebP: VP8-Kompression (Google Video-Codec)
+- AVIF: Alliance for Open Media (Google, Netflix, Amazon, Apple, Mozilla)
+- Beide besser als JPEG, aber Kompatibilität bleibt Problem
+- JPEG bleibt dominant: alte Kameras, Software, Workflows
 -->
 
 
@@ -414,28 +479,22 @@ Weil "e" am häufigsten vorkommt, bekommt es den kürzesten Code.
 
 # Container und Codec
 
-**Container = Das Dateiformat (Beispiel: MP4)**
+**Container = Dateiformat (z.B. MP4)**
 Die "Box", die verschiedene Streams zusammenpackt:
 - Video-Stream
 - Audio-Stream(s)
 - Untertitel
 - Metadaten
 
-**Codec = Der Kompressionsalgorithmus (Beispiel: AV1)**
+**Codec = Kompressionsalgorithmus (z.B. H.264)**
-Entscheidet, WIE komprimiert wird.
+Bestimmt, WIE komprimiert wird
-
 
 <!--
-Container ≠ Codec
+KLAUSURRELEVANT:
-Das ist ein häufiges Missverständnis.
+- Container ≠ Codec (häufiges Missverständnis!)
-
+- MP4 kann H.264, H.265 oder AV1 enthalten
-MP4 ist ein Container, nicht ein Codec.
+- Gleiche Endung, unterschiedlicher Inhalt
-Ein MP4 kann H.264, H.265 oder AV1 enthalten.
+- Tool-Tipp: MediaInfo zeigt beides an
-
-Übrigens: JPEG ist ein Codec (für Bilder), kein Container.
-Bei Bildern fallen Container und Codec oft zusammen.
-
-Tools wie MediaInfo zeigen beide Informationen.
 -->
 
 
@@ -451,19 +510,19 @@ Tools wie MediaInfo zeigen beide Informationen.
 
 **Warum dominant?**
 - Exzellente Kompression (~100:1 möglich)
-- Hardware-Support in jedem Gerät seit ~2010
+- Hardware-Decoder in jedem Gerät seit ~2010
 - YouTube, Netflix, Blu-ray – alles H.264
 
 **Features:**
 - Variable Block-Größen (16×16 bis 4×4)
-- Deblocking-Filter (reduziert Block-Artefakte)
+- Deblocking-Filter (reduziert Artefakte)
 
 <!--
-H.264 revolutionierte Video-Streaming.
+KLAUSURRELEVANT:
-Ohne H.264 kein Netflix, kein YouTube in HD.
+- H.264 revolutionierte Video-Streaming
-
+- Ohne H.264 kein Netflix, kein YouTube HD
-Hardware-Decoder bedeutet: Kein CPU-Aufwand, kein Akku-Drain.
+- Hardware-Decoder = kein CPU-Aufwand, kein Akku-Drain
-Selbst billige Smartphones können H.264 abspielen.
+- Selbst billigste Smartphones können H.264 abspielen
 -->
 
 
@@ -486,17 +545,16 @@ Google, Netflix, Amazon, Microsoft, Apple, Mozilla...
 - 8K, HDR, hohe Frame-Rates
 
 **Stand 2025:**
-YouTube und Netflix nutzen AV1 für 4K/8K
+YouTube, Netflix nutzen AV1 für 4K/8K
 Hardware-Encoder in aktuellen GPUs
 
 <!--
-AOM = Alliance for Open Media, gegründet 2015.
+KLAUSURRELEVANT:
-Historisch: Konkurrierende Tech-Giganten vereint.
+- AOM gegründet 2015 – historisch: Konkurrenten vereint
-
+- Ziel: Nie wieder Patent-Chaos wie bei H.265
-Das Ziel: Nie wieder Patent-Chaos wie bei H.265.
+- Problem: Encoding sehr langsam (10–100× vs. H.264)
-
+- Hardware-Encoder lösen das zunehmend
-Problem: Encoding ist sehr langsam (10-100× vs. H.264).
+- AV1 gewann 2024 einen Emmy für technische Innovation
-Hardware-Encoder lösen das zunehmend.
 -->
 
 

slides/223015c/00-intro.md

@@ -0,0 +1,228 @@
+---
+marp: true
+theme: gaia
+paginate: true
+backgroundColor: #fff
+header: "Grundlagen IT- und Internettechnik (223015c)"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
+title: Grundlagen IT- und Internettechnik
+---
+
+<style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #d63384;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
+section {
+  font-size: 1.7rem;
+}
+h1 {
+  color: #a02060;
+}
+section.invert h1 {
+  color: #fff;
+}
+h2 {
+  color: #1f2937;
+}
+pre {
+  background: #0f0f23;
+  color: #d63384;
+  border-radius: 8px;
+  border-left: 3px solid #d63384;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #d63384;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
+}
+section.klausur {
+  background: repeating-linear-gradient(
+    135deg,
+    #fce4ec,
+    #fce4ec 40px,
+    #fff 40px,
+    #fff 80px
+  ) !important;
+}
+@media print {
+  section.klausur {
+    background: #fce4ec !important;
+  }
+}
+section.aufgabe {
+  background: #fce4ec !important;
+}
+section.aufgabe footer {
+  display: none;
+}
+</style>
+
+<!-- _class: invert -->
+<!-- _header: '' -->
+<!-- _backgroundColor: #000 -->
+
+![bg cover opacity:0.2](./assets/background-termin-1.png)
+
+# Grundlagen IT- und Internettechnik
+
+**223015c** · Modul "Technik 1" · 1. Semester
+Digital- und Medienwirtschaft
+Hochschule der Medien Stuttgart
+
+**Sommersemester 2026**
+
+[https://librete.ch/hdm/223015c/](https://librete.ch/hdm/223015c/)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/qr/slides-223015c.png)
+
+---
+
+<!-- _class: lead -->
+
+# Herzlich willkommen!
+## Einführung
+
+---
+
+# Über mich
+
+**Michael Werner Czechowski**
+
+- Systems and Platform Engineer
+- Schwerpunkte:
+  - Web-Technologien, Barriere-Armut, Open Source
+- Hintergrund:
+  - Philosophie (Uni Stuttgart)
+  - Wirtschaftsinformatik (Leibniz-FH Hannover)
+- Kontakt: lb-czechowski@hdm-stuttgart.de
+
+---
+
+# Warum dieses Modul?
+
+**Das Internet ist überall** – aber was steckt dahinter?
+
+* Warum sehen Webseiten auf dem Handy anders aus?
+* Wie funktioniert eigentlich das Internet?
+* Wie erkennen Sie, ob eine Werbeagentur gute Arbeit leistet?
+* Was hat ein Unterseekabel mit meiner E-Mail zu tun?
+* **→ Die Technik dahinter verstehen und fundierte Entscheidungen treffen**
+
+---
+
+# Das Ziel
+
+**Technische Grundlagen verstehen**, um fundierte Entscheidungen treffen zu können.
+
+Als Digital- und MedienwirtschaftlerInnen werdet ihr täglich mit technischen Fragen konfrontiert:
+* Wie baue ich eine barrierearme Webseite?
+* Welches Protokoll für welchen Zweck?
+* Wie funktioniert das Web hinter den Kulissen?
+* **→ Mitreden können – und selbst Webseiten bauen!**
+
+---
+
+# Was Sie hier lernen werden
+
+**In dieser Veranstaltung erwerben Sie folgende Kompetenzen:**
+
+* Geschichte des Computers und Internets
+* HTML-Grundlagen und semantisches Markup
+* CSS für Layout und Gestaltung
+* Netzwerke und Protokolle (TCP/IP, DNS, HTTP(S))
+* "Barrierefreiheit" im Web
+* Grundlagen von JavaScript und Interaktivität
+
+---
+
+# Kurze Umfrage
+
+**Bitte Hand heben:**
+* Wer hat schon mal eine Webseite gebaut?
+* Wer weiß, was HTML ist?
+* Wer hat schon mal CSS geschrieben? 
+* Wer kennt den Unterschied zwischen Internet und WWW? 
+* Wer hat schon mal mit JavaScript gearbeitet?
+
+---
+
+# Kursübersicht
+
+**Kapitel:**
+
+1. Geschichte, Grundlagen & **HTML**
+2. Netzwerke, Protokolle, **semantisches HTML** & **CSS**
+3. Interaktivität, Animationen & **JavaScript**
+
+**Ziel:** "Gelernte Hilflosigkeit" ablegen
+
+---
+
+<!-- _class: klausur -->
+<!-- _header: '' -->
+<!-- _footer: '' -->
+<!-- _backgroundColor: #fce4ec -->
+
+# Prüfungsleistung
+
+**Nach aktuellem Kenntnisstand:**
+
+* 90 min insg. (Technik 1)
+* Schriftliche Klausur (digital)
+* Teils offene Fragen
+* So gut wie kein Coding/Programmieren
+* **Prüfungsrelevant:** Folien sind markiert mit anderem Hintergrund
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/klausur-01.png)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/klausur-02.png)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/klausur-03.png)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/splan.png)
+
+---
+
+<!-- _header: '' -->
+<!-- _footer: '' -->
+
+![bg fit](./assets/asta.png)
+

slides/223015c/03-interaktivitaet-javascript.md

@@ -4,7 +4,7 @@ theme: gaia
 paginate: true
 backgroundColor: #fff
 header: "Grundlagen IT- und Internettechnik (223015c)"
-footer: "Michael Czechowski – HdM Stuttgart – WS 2025/26"
+footer: "Michael Czechowski – HdM Stuttgart – SoSe 2026"
 title: "Kapitel 3: Interaktivität & JavaScript"
 ---
 
@@ -83,7 +83,7 @@ section.aufgabe footer {
 Digital- und Medienwirtschaft
 Hochschule der Medien Stuttgart
 
-**Wintersemester 2025/26**
+**Sommersemester 2026**
 
 [https://librete.ch/hdm/223015c/](https://librete.ch/hdm/223015c/)
 
@@ -208,6 +208,8 @@ Fehler werden hier auch angezeigt
 
 # Variablen: Daten speichern
 
+![bg right:35%](./assets/demos/js-console.png)
+
 ```javascript
 // Modern (empfohlen)
 let age = 25;              // Kann geändert werden
@@ -260,6 +262,8 @@ Template Literals mit Backticks!
 
 # Arrays: Listen
 
+![bg right:35%](./assets/demos/js-arrays.png)
+
 ```javascript
 const colors = ["red", "green", "blue"];
 
@@ -284,6 +288,8 @@ Arrays sind veränderbar auch bei const
 
 # Objects: Strukturierte Daten
 
+![bg right:35%](./assets/demos/js-objects.png)
+
 ```javascript
 const person = {
     firstName: "Max",
@@ -342,7 +348,7 @@ true || false  // true (ODER)
 
 **In der Browser-Konsole:**
 
-1. Erstelle Variablen für dich:
+1. Erstellen Sie Variablen für sich:
    ```javascript
    const name = "Your Name";
    let age = 20;
@@ -413,6 +419,8 @@ Code-Block in geschweiften Klammern
 
 # Schleifen: Wiederholen
 
+![bg right:35%](./assets/demos/js-loops.png)
+
 ```javascript
 // for-Schleife
 for (let i = 0; i < 5; i++) {
@@ -491,15 +499,7 @@ Funktionale Programmierung, Original-Array bleibt unverändert
 - JavaScript kann diesen Baum **lesen und ändern**
 - Jedes HTML-Element = ein "Node"
 
-```
+![bg right:45% fit](./assets/demos/dom-tree.png)
-document
-└── html
-    ├── head
-    │   └── title
-    └── body
-        ├── h1
-        └── p
-```
 
 <!--
 DOM = Programmierschnittstelle für HTML
@@ -536,6 +536,8 @@ querySelectorAll = alle Treffer
 
 # Elemente manipulieren
 
+![bg right:35%](./assets/demos/js-manipulate.png)
+
 ```javascript
 const element = document.querySelector("#meinElement");
 
@@ -564,6 +566,8 @@ style = Inline-Styles (camelCase!)
 
 # Klassen manipulieren
 
+![bg right:35%](./assets/demos/js-classlist.png)
+
 ```javascript
 const element = document.querySelector(".box");
 
@@ -592,6 +596,8 @@ toggle schaltet hin und her
 
 # Elemente erstellen
 
+![bg right:35%](./assets/demos/js-create.png)
+
 ```javascript
 // Neues Element erstellen
 const neuerAbsatz = document.createElement("p");
@@ -660,6 +666,8 @@ Interaktive Webseiten durch Events
 
 # Event Listener
 
+![bg right:35%](./assets/demos/js-event-listener.png)
+
 ```javascript
 const button = document.querySelector("#meinButton");
 
@@ -737,6 +745,8 @@ target = auslösendes Element
 
 # Event.preventDefault()
 
+![bg right:35%](./assets/demos/js-preventdefault.png)
+
 ```javascript
 // Link ohne Navigation
 const link = document.querySelector("a");
@@ -763,6 +773,8 @@ Formular-Validierung ohne Reload
 
 # Beispiel: Toggle Dark Mode
 
+![bg right:35%](./assets/demos/js-darkmode.png)
+
 ```javascript
 const toggleButton = document.querySelector("#darkModeToggle");
 const body = document.body;
@@ -851,6 +863,8 @@ HTML (Struktur) + CSS (Design) + JavaScript (Interaktivität)
 
 # Beispiel: Todo-Liste
 
+![bg right:35%](./assets/demos/js-todo.png)
+
 ```javascript
 const form = document.querySelector("#todoForm");
 const input = document.querySelector("#todoInput");
@@ -893,6 +907,8 @@ Node.js für Backend
 
 # Fetch: Daten laden
 
+![bg right:35%](./assets/demos/js-fetch.png)
+
 ```javascript
 // Mit async/await (modern)
 async function loadData() {
@@ -914,6 +930,8 @@ APIs = Schnittstellen zu Daten, JSON = JavaScript Object Notation
 
 # LocalStorage: Daten speichern
 
+![bg right:35%](./assets/demos/js-localstorage.png)
+
 ```javascript
 // Speichern
 localStorage.setItem("name", "Max");

slides/223015c/assets/demos/_frame-template.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: __TITLE__</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">__URL__</span>
+    </div>
+    <iframe src="__SRC__"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/a11y-error-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: a11y-error</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/email-form.html</span>
+    </div>
+    <iframe src="./a11y-error.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/a11y-error.html

@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Fehlermeldung</title>
+  <style>
+    body { font-family: system-ui, sans-serif; padding: 1.2rem; }
+    label { display: block; margin-bottom: 4px; font-weight: 600; }
+    input {
+      font: inherit;
+      padding: 6px 10px;
+      width: 100%;
+      box-sizing: border-box;
+      border: 2px solid #d63384;
+      border-radius: 4px;
+    }
+    #email-error {
+      color: #d63384;
+      font-size: 0.9em;
+      margin-top: 6px;
+    }
+  </style>
+</head>
+<body>
+  <label for="email">E-Mail-Adresse</label>
+  <input id="email" type="email" aria-describedby="email-error" value="michael@">
+  <p id="email-error" role="alert">
+    Bitte geben Sie eine gültige E-Mail-Adresse ein.
+  </p>
+</body>
+</html>

slides/223015c/assets/demos/a11y-focus-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: a11y-focus</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/focus.html</span>
+    </div>
+    <iframe src="./a11y-focus.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/a11y-focus.html

@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Fokus-Indikator</title>
+  <style>
+    body { font-family: system-ui, sans-serif; padding: 1.4rem; font-size: 1rem; }
+    button { font: inherit; padding: 10px 18px; margin: 8px 0; display: block; border: 1.5px solid #d1d5db; background: #fff; border-radius: 4px; cursor: pointer; }
+    button:focus-visible, button.is-focused {
+      outline: 3px solid #d63384;
+      outline-offset: 3px;
+      border-radius: 4px;
+    }
+  </style>
+</head>
+<body>
+  <p><strong>Tab-Taste drücken:</strong></p>
+  <button class="is-focused">Erster Button</button>
+  <button>Zweiter Button</button>
+  <button>Dritter Button</button>
+</body>
+</html>

slides/223015c/assets/demos/a11y-semantic-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: a11y-semantic</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/klick.html</span>
+    </div>
+    <iframe src="./a11y-semantic.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/a11y-semantic.html

@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>div vs button</title>
+  <style>
+    body { font-family: system-ui, sans-serif; padding: 1.2rem; }
+    h3 { margin: 0.8rem 0 0.4rem; font-size: 1rem; }
+    .bad { color: #b91c1c; }
+    .good { color: #15803d; }
+    .button {
+      display: inline-block;
+      background: #e5e7eb;
+      border: 1px solid #9ca3af;
+      padding: 6px 14px;
+      cursor: pointer;
+      border-radius: 4px;
+    }
+    button { font: inherit; padding: 6px 14px; }
+  </style>
+</head>
+<body>
+  <h3 class="bad">Schlecht (div)</h3>
+  <div class="button" onclick="alert('!')">Klick mich</div>
+  <p><small>❌ Tab überspringt, kein Enter, kein Screenreader</small></p>
+
+  <h3 class="good">Gut (button)</h3>
+  <button type="button">Klick mich</button>
+  <p><small>✅ Tastatur + Screenreader eingebaut</small></p>
+</body>
+</html>

slides/223015c/assets/demos/arp-lookup.html

@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>ARP</title>
+  <style>
+    html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, sans-serif; }
+    body { padding: 30px; display: inline-block; }
+    .row { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
+    .actor {
+      background: #1a1a2e;
+      color: #fff;
+      padding: 10px 16px;
+      border-radius: 6px;
+      font-weight: 700;
+      min-width: 160px;
+      text-align: center;
+      font-size: 0.9rem;
+    }
+    .laptop { background: #1e40af; }
+    .router { background: #c2410c; }
+    .arrow-right, .arrow-left {
+      width: 0; height: 0;
+      border-top: 10px solid transparent;
+      border-bottom: 10px solid transparent;
+    }
+    .arrow-right { border-left: 14px solid #d63384; }
+    .arrow-left { border-right: 14px solid #15803d; }
+    .bubble {
+      padding: 10px 14px;
+      border-radius: 8px;
+      font-size: 0.95rem;
+      max-width: 460px;
+    }
+    .ask { background: #fce7f3; border: 2px solid #d63384; color: #7c2d12; }
+    .reply { background: #dcfce7; border: 2px solid #15803d; color: #14532d; }
+    .meta {
+      font-size: 0.7rem;
+      font-weight: 700;
+      text-transform: uppercase;
+      letter-spacing: 0.05em;
+      opacity: 0.7;
+      margin-bottom: 3px;
+    }
+  </style>
+</head>
+<body>
+  <div class="row">
+    <div class="actor laptop">Laptop</div>
+    <div class="arrow-right"></div>
+    <div class="bubble ask">
+      <div class="meta">Broadcast</div>
+      "Wer hat die IP 192.168.1.1? Sag mir deine MAC!"
+    </div>
+  </div>
+  <div class="row">
+    <div class="bubble reply">
+      <div class="meta">Antwort</div>
+      "Das bin ich! Meine MAC ist 11:22:33:44:55:66"
+    </div>
+    <div class="arrow-left"></div>
+    <div class="actor router">Router</div>
+  </div>
+</body>
+</html>

slides/223015c/assets/demos/box-model-diagram.html

@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Box-Modell Diagramm</title>
+  <style>
+    html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, sans-serif; }
+    body { padding: 40px; display: inline-block; box-sizing: border-box; }
+    .layer {
+      padding-top: 38px;
+      padding-bottom: 30px;
+      padding-left: 30px;
+      padding-right: 30px;
+      position: relative;
+      border-radius: 4px;
+    }
+    .layer::before {
+      position: absolute;
+      top: 8px; left: 14px;
+      font-size: 0.95rem;
+      font-weight: 700;
+      letter-spacing: 0.02em;
+    }
+    .margin { background: #fde68a; }
+    .margin::before { content: "margin"; color: #92400e; }
+    .border { background: #fca5a5; }
+    .border::before { content: "border"; color: #991b1b; }
+    .padding { background: #86efac; }
+    .padding::before { content: "padding"; color: #166534; }
+    .content {
+      background: #93c5fd;
+      width: 260px;
+      height: 110px;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      color: #1e3a8a;
+      font-weight: 700;
+      font-size: 1.2rem;
+      border-radius: 4px;
+    }
+  </style>
+</head>
+<body>
+  <div class="layer margin">
+    <div class="layer border">
+      <div class="layer padding">
+        <div class="content">content</div>
+      </div>
+    </div>
+  </div>
+</body>
+</html>

slides/223015c/assets/demos/button-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: button</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/button.html</span>
+    </div>
+    <iframe src="./button.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/button.html

@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Button</title>
+</head>
+<body>
+  <button>Add to favorites</button>
+</body>
+</html>

slides/223015c/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/223015c/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/223015c/assets/demos/client-server-ports.html

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Client/Server Ports</title>
+  <style>
+    html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, sans-serif; }
+    body { padding: 30px; display: inline-block; }
+    .endpoint {
+      border: 2px solid #4a4a6a;
+      border-radius: 6px;
+      padding: 18px 24px;
+      margin-bottom: 24px;
+      min-width: 380px;
+      background: #f3f4f6;
+    }
+    .endpoint.client { background: #dbeafe; border-color: #1e40af; }
+    .endpoint.server { background: #fed7aa; border-color: #c2410c; }
+    .role {
+      font-weight: 700;
+      font-size: 1rem;
+      margin-bottom: 6px;
+    }
+    .client .role { color: #1e3a8a; }
+    .server .role { color: #7c2d12; }
+    .addr {
+      font-family: ui-monospace, monospace;
+      font-size: 1.4rem;
+      color: #0f172a;
+    }
+    .port {
+      background: #fde68a;
+      color: #7c2d12;
+      padding: 1px 8px;
+      border-radius: 4px;
+      font-weight: 700;
+    }
+    .label {
+      margin-top: 6px;
+      font-size: 0.85rem;
+      color: #4a4a6a;
+      font-style: italic;
+    }
+  </style>
+</head>
+<body>
+  <div class="endpoint client">
+    <div class="role">Client</div>
+    <div class="addr">141.62.xxx.xxx:<span class="port">52431</span></div>
+    <div class="label">↳ zufälliger Port vom OS</div>
+  </div>
+  <div class="endpoint server">
+    <div class="role">Server</div>
+    <div class="addr">212.132.79.37:<span class="port">443</span></div>
+    <div class="label">↳ HTTPS-Standardport</div>
+  </div>
+</body>
+</html>

slides/223015c/assets/demos/contrast-levels-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: Kontrast</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/contrast.html</span>
+    </div>
+    <iframe src="./contrast-levels.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/contrast-levels.html

@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Kontrast-Stufen</title>
+  <style>
+    body { font-family: system-ui, sans-serif; padding: 1.6rem; margin: 0; }
+    .row {
+      background: #fff;
+      padding: 22px 20px;
+      margin-bottom: 14px;
+      border-radius: 6px;
+      border: 1px solid #e5e7eb;
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      gap: 14px;
+    }
+    .sample {
+      font-size: 1.5rem;
+      font-weight: 600;
+      flex: 1;
+    }
+    .meta {
+      text-align: right;
+      font-size: 0.85rem;
+      white-space: nowrap;
+    }
+    .ratio {
+      font-family: ui-monospace, monospace;
+      font-weight: 700;
+      font-size: 0.95rem;
+      color: #1a1a2e;
+    }
+    .badge {
+      display: inline-block;
+      padding: 2px 8px;
+      border-radius: 3px;
+      font-size: 0.7rem;
+      font-weight: 700;
+      text-transform: uppercase;
+      letter-spacing: 0.05em;
+      margin-top: 4px;
+    }
+    .fail { background: #fee2e2; color: #991b1b; }
+    .aa-large { background: #fed7aa; color: #7c2d12; }
+    .aa { background: #dcfce7; color: #166534; }
+    .aaa { background: #bbf7d0; color: #14532d; }
+    .hint {
+      margin-top: 14px;
+      font-size: 0.78rem;
+      color: #6b7280;
+      font-style: italic;
+      text-align: right;
+    }
+    .hint a { color: #d63384; }
+  </style>
+</head>
+<body>
+  <div class="row" style="background: #fff;">
+    <div class="sample" style="color: #aaaaaa;">Barrierefrei lesen</div>
+    <div class="meta">
+      <div class="ratio">2.3:1</div>
+      <span class="badge fail">✗ Fail</span>
+    </div>
+  </div>
+  <div class="row" style="background: #fff;">
+    <div class="sample" style="color: #949494;">Barrierefrei lesen</div>
+    <div class="meta">
+      <div class="ratio">3:1</div>
+      <span class="badge aa-large">AA Large</span>
+    </div>
+  </div>
+  <div class="row" style="background: #fff;">
+    <div class="sample" style="color: #767676;">Barrierefrei lesen</div>
+    <div class="meta">
+      <div class="ratio">4.5:1</div>
+      <span class="badge aa">✓ AA</span>
+    </div>
+  </div>
+  <div class="row" style="background: #fff;">
+    <div class="sample" style="color: #595959;">Barrierefrei lesen</div>
+    <div class="meta">
+      <div class="ratio">7:1</div>
+      <span class="badge aaa">✓ AAA</span>
+    </div>
+  </div>
+  <div class="row" style="background: #fff;">
+    <div class="sample" style="color: #1a1a1a;">Barrierefrei lesen</div>
+    <div class="meta">
+      <div class="ratio">16:1</div>
+      <span class="badge aaa">✓ AAA+</span>
+    </div>
+  </div>
+  <div class="hint">Check: webaim.org/resources/contrastchecker</div>
+</body>
+</html>

slides/223015c/assets/demos/css-anatomie-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-anatomie</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/anatomie.html</span>
+    </div>
+    <iframe src="./css-anatomie.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-anatomie.html

@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>CSS Anatomie</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; }
+    p { color: blue; font-size: 16px; }
+  </style>
+</head>
+<body>
+  <p>Dieser Absatz ist blau und 16 Pixel groß.</p>
+  <p>Alle p-Elemente werden gleich gestylt.</p>
+</body>
+</html>

slides/223015c/assets/demos/css-box-model-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-box-model</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/box-model.html</span>
+    </div>
+    <iframe src="./css-box-model.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-box-model.html

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Box-Modell</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; background: #fff; }
+    .box { display: inline-block; }
+    .layer {
+      padding-top: 22px;
+      padding-bottom: 18px;
+      padding-left: 18px;
+      padding-right: 18px;
+      position: relative;
+    }
+    .layer::before {
+      position: absolute;
+      top: 4px; left: 8px;
+      font-size: 0.75em;
+      font-weight: 600;
+    }
+    .margin { background: #fde68a; }
+    .margin::before { content: "margin"; color: #92400e; }
+    .border { background: #fca5a5; }
+    .border::before { content: "border"; color: #991b1b; }
+    .padding { background: #86efac; }
+    .padding::before { content: "padding"; color: #166534; }
+    .content {
+      background: #93c5fd;
+      width: 140px;
+      height: 56px;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      color: #1e3a8a;
+      font-weight: 600;
+    }
+    pre { background: #f3f4f6; padding: 10px; border-radius: 4px; font-size: 0.85em; margin-top: 1rem; font-family: ui-monospace, monospace; }
+  </style>
+</head>
+<body>
+  <div class="box">
+    <div class="layer margin">
+      <div class="layer border">
+        <div class="layer padding">
+          <div class="content">content</div>
+        </div>
+      </div>
+    </div>
+  </div>
+  <pre>.box {
+  width: 140px;
+  padding: 18px;
+  border: 18px solid;
+  margin: 18px;
+}</pre>
+</body>
+</html>

slides/223015c/assets/demos/css-colors-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-colors</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/colors.html</span>
+    </div>
+    <iframe src="./css-colors.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-colors.html

@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Farben</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; font-size: 14px; }
+    .swatch { display: flex; align-items: center; margin-bottom: 8px; }
+    .chip { width: 40px; height: 40px; border-radius: 4px; margin-right: 12px; border: 1px solid #e5e7eb; }
+    code { background: #f3f4f6; padding: 2px 6px; border-radius: 3px; font-family: ui-monospace, monospace; font-size: 0.85em; }
+  </style>
+</head>
+<body>
+  <div class="swatch"><div class="chip" style="background: red;"></div><code>color: red;</code></div>
+  <div class="swatch"><div class="chip" style="background: rebeccapurple;"></div><code>color: rebeccapurple;</code></div>
+  <div class="swatch"><div class="chip" style="background: #FF0000;"></div><code>#FF0000</code></div>
+  <div class="swatch"><div class="chip" style="background: rgb(255, 0, 0);"></div><code>rgb(255, 0, 0)</code></div>
+  <div class="swatch"><div class="chip" style="background: rgba(255, 0, 0, 0.5);"></div><code>rgba(255, 0, 0, 0.5)</code></div>
+  <div class="swatch"><div class="chip" style="background: hsl(0, 100%, 50%);"></div><code>hsl(0, 100%, 50%)</code></div>
+</body>
+</html>

slides/223015c/assets/demos/css-combinators-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-combinators</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/combinators.html</span>
+    </div>
+    <iframe src="./css-combinators.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-combinators.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Kombinatoren</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; font-size: 14px; }
+    article p { line-height: 1.6; background: #fef3c7; padding: 4px; }
+    nav > a { text-decoration: none; color: #d63384; margin-right: 10px; font-weight: 600; }
+    h2 + p { font-size: 1.2em; color: #065f46; }
+    p.wichtig { color: red; }
+  </style>
+</head>
+<body>
+  <nav>
+    <a href="#">Link</a><a href="#">Link</a>
+  </nav>
+  <article>
+    <h2>Artikel-Überschrift</h2>
+    <p>Direkt nach h2 (größer, grün).</p>
+    <p>Normaler Absatz im article (gelb).</p>
+    <p class="wichtig">Wichtig (rot).</p>
+  </article>
+</body>
+</html>

slides/223015c/assets/demos/css-pseudo-classes-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-pseudo-classes</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/pseudo-classes.html</span>
+    </div>
+    <iframe src="./css-pseudo-classes.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-pseudo-classes.html

@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Pseudo-Klassen</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; font-size: 14px; }
+    a { color: #2563eb; }
+    a:hover, a.is-hovered { color: red; text-decoration: underline; }
+    a:visited, a.is-visited { color: purple; }
+    input:focus, input.is-focused { border-color: blue; outline: 2px solid blue; }
+    input { padding: 4px 8px; border: 1px solid #9ca3af; border-radius: 3px; }
+    ul { list-style: none; padding: 0; }
+    li { padding: 6px 10px; }
+    li:first-child, li.is-first { font-weight: bold; }
+    li:nth-child(odd), li.is-odd { background: #eee; }
+    h3 { margin: 0.6rem 0 0.3rem; font-size: 0.95rem; }
+  </style>
+</head>
+<body>
+  <h3>:hover / :visited</h3>
+  <a href="#" class="is-hovered">Link mit Hover</a> &middot;
+  <a href="#" class="is-visited">Besuchter Link</a>
+
+  <h3>:focus</h3>
+  <input class="is-focused" value="fokussiert">
+
+  <h3>:first-child, :nth-child(odd)</h3>
+  <ul>
+    <li class="is-first is-odd">Erster (bold, zebra)</li>
+    <li>Zweiter</li>
+    <li class="is-odd">Dritter (zebra)</li>
+    <li>Vierter</li>
+    <li class="is-odd">Fünfter (zebra)</li>
+  </ul>
+</body>
+</html>

slides/223015c/assets/demos/css-pseudo-elements-frame.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Preview: css-pseudo-elements</title>
+<style>
+  :root {
+    --hl: #d63384;
+    --dark: #0f0f23;
+    --chrome: #1a1a2e;
+    --muted: #4a4a6a;
+  }
+  html, body { margin: 0; padding: 0; background: var(--dark); font-family: system-ui, -apple-system, sans-serif; }
+  .browser { box-sizing: border-box; width: 100vw; min-height: 100vh; padding: 18px; }
+  .window { background: #fff; border-radius: 10px; box-shadow: 0 12px 32px rgba(0,0,0,.35); overflow: hidden; border: 2px solid var(--hl); }
+  .chrome { background: var(--chrome); border-bottom: 2px solid var(--hl); padding: 10px 14px; display: flex; align-items: center; gap: 7px; }
+  .dot { width: 11px; height: 11px; border-radius: 50%; opacity: 0.9; }
+  .r { background: #ff5f56; } .y { background: #ffbd2e; } .g { background: #27c93f; }
+  .url { flex: 1; margin-left: 12px; background: var(--dark); border: 1px solid var(--hl); border-radius: 6px; padding: 5px 10px; font: 12px/1.3 ui-monospace, "SF Mono", Menlo, monospace; color: var(--hl); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  iframe { display: block; width: 100%; height: 700px; border: 0; background: #fff; }
+</style>
+</head>
+<body>
+<div class="browser">
+  <div class="window">
+    <div class="chrome">
+      <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+      <span class="url">file:///beispiel/pseudo-elements.html</span>
+    </div>
+    <iframe src="./css-pseudo-elements.html"></iframe>
+  </div>
+</div>
+</body>
+</html>

slides/223015c/assets/demos/css-pseudo-elements.html

@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <title>Pseudo-Elemente</title>
+  <style>
+    body { padding: 1.2rem; font-family: system-ui, sans-serif; font-size: 14px; }
+    .required::before {
+      content: "* ";
+      color: red;
+    }
+    p.drop { line-height: 1.5; }
+    p.drop::first-letter {
+      font-size: 3em;
+      font-weight: bold;
+      color: #d63384;
+      float: left;
+      line-height: 0.9;
+      padding-right: 6px;
+      padding-top: 2px;
+    }
+    label { display: block; margin-top: 10px; }
+    input { padding: 4px 8px; border: 1px solid #9ca3af; border-radius: 3px; margin-top: 3px; }
+    h3 { margin: 0.6rem 0 0.3rem; font-size: 0.95rem; }
+  </style>
+</head>
+<body>
+  <h3>::before (Pflichtfeld-Sternchen)</h3>
+  <label class="required">E-Mail-Adresse</label>
+  <input type="email">
+
+  <h3>::first-letter (Initial-Buchstabe)</h3>
+  <p class="drop">Lorem ipsum dolor sit amet. Der erste Buchstabe wird per CSS hervorgehoben – kein extra HTML nötig.</p>
+</body>
+</html>