add consistent dark theme styling across all slides

- add CSS variables for colors (foreground, highlight, dimmed)
- style code blocks with dark background and blue accent
- improve inline code appearance
- update link colors
- add deploy restriction to CLAUDE.md

CLAUDE.md

@@ -5,6 +5,7 @@ This project builds a presentation deck for Marp based on Markdown files.
 ## Agent Restrictions
 - Agent NEVER runs commands on its own except changing files INSIDE THIS FOLDER, never any other then this
 - Agent NEVER runs build commands or any automated processes without explicit user request, as the user is working in dev mode
+- Agent NEVER runs deploy commands (make deploy, scp, etc.) without explicit user permission - always ask first
 
 ## Critical File Protection: index.md
 - `index.md` is the MAIN CONTENT FILE for the entire lecture series - treat with extreme care

slides/2025-12-19-termin-0-intro.md

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>
 

slides/2025-12-19-termin-1-grundlagen-text-audio.md

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>
 
@@ -472,8 +499,7 @@ Tool: HxD (Windows), Hex Fiend (Mac), xxd (Linux)
 | PDF | `25 50 44 46` | % P D F ✓ |
 | ZIP | `50 4B 03 04` | P K ✗ ✗ |
 
-**Wichtig:** ASCII = nur 0-127! Werte darüber (z.B. `89` = 137) sind **nicht druckbar** (non-printable).
+**Wichtig:** ASCII = nur 0-127! Werte darüber (z.B. `89` = 137) sind **nicht druckbar** (non-printable). *Hex-Editoren zeigen dafür `.` oder `ÿ` als Platzhalter.*
-Hex-Editoren zeigen dafür `.` oder `ÿ` als Platzhalter.
 
 <!--
 "Warum findet ihr 89 nicht in der ASCII-Tabelle?"

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

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>
 

slides/2026-01-23-termin-3-speichermedien-schnittstellen.md

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>
 

slides/2026-01-30-termin-4-distribution-apis-zukunft.md

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>
 

slides/2026-xx-xx-termin-5-vertiefung-offene-fragen.md

@@ -9,11 +9,38 @@ title: Dateiformate, Schnittstellen, Speichermedien & Distributionswege
 ---
 
 <style>
+:root {
+  --color-foreground: #1a1a2e;
+  --color-highlight: #5da9e9;
+  --color-dimmed: #4a4a6a;
+}
+section.invert {
+  --color-foreground: #fff;
+}
 section {
   font-size: 1.7rem;
 }
 h2 {
-  color: var(--color-dimmed);
+  color: var(--color-highlight);
+}
+pre {
+  background: #0f0f23;
+  color: #5da9e9;
+  border-radius: 8px;
+  border-left: 3px solid #5da9e9;
+}
+pre code {
+  background: transparent;
+  color: inherit;
+}
+code {
+  background: #1a1a2e;
+  color: #5da9e9;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+}
+a {
+  color: var(--color-highlight);
 }
 </style>