diff --git a/setup.sh b/setup.sh
index e5e04ee..47ccba6 100644
--- a/setup.sh
+++ b/setup.sh
@@ -1,103 +1,82 @@
-#!/bin/bash
+#!/bin/sh
 
 # --- 1. Deine individuellen Datei-URLs ---
-URL_NVIM_INIT="https://git.ungruhe.info/Tim/dotfiles/raw/branch/main/.config/nvim/init.lua"
-URL_FASTFETCH="https://git.ungruhe.info/Tim/dotfiles/raw/branch/main/.config/fastfetch/fastfetch.jsonc"
+URL_NVIM_INIT="http://DEIN_GITEA/init.lua"
+URL_FASTFETCH="http://DEIN_GITEA/fastfetch.jsonc"
 
-echo "🔍 Scanne System für maßgeschneidertes Setup..."
+echo "🔍 Scanne System (POSIX mode)..."
 
-# --- 2. System-Erkennung ---
+# --- 2. System-Erkennung (sh-kompatibel) ---
 if [ -f /etc/os-release ]; then
     . /etc/os-release
     OS_ID=$ID
-    OS_LIKE=$ID_LIKE
-elif [[ "$OSTYPE" == "darwin"* ]]; then
-    OS_ID="macos"
 else
     OS_ID="unknown"
 fi
 
-# --- 3. Intelligente Paket-Installation ---
+# --- 3. Voraussetzungen installieren ---
+# Wir prüfen erst, welcher Manager da ist
 echo "📦 Installiere Pakete für: $OS_ID..."
-SUDO=""
-command -v sudo >/dev/null && SUDO="sudo"
+if command -v sudo >/dev/null 2>&1; then S="sudo"; else S=""; fi
 
-case "$OS_ID" in
-    arch|cachyos)
-        $SUDO pacman -Syu --needed --noconfirm zsh curl git neovim fastfetch eza shadow ;;
-    debian|ubuntu|trixie|kali)
-        $SUDO apt update && $SUDO apt install -y zsh curl git neovim fastfetch eza ;;
-    alpine)
-        $SUDO apk add zsh curl git neovim fastfetch eza shadow ncurses-terminfo-base ;;
-    *)
-        echo "⚠️ System $OS_ID nicht explizit unterstützt, versuche Standard-ZSH..."
-        $SUDO apt install -y zsh curl || echo "Installation fehlgeschlagen." ;;
-esac
+if command -v apt-get >/dev/null 2>&1; then
+    $S apt-get update && $S apt-get install -y zsh curl git neovim fastfetch eza
+elif command -v pacman >/dev/null 2>&1; then
+    $S pacman -Syu --needed --noconfirm zsh curl git neovim fastfetch eza shadow
+elif command -v apk >/dev/null 2>&1; then
+    $S apk add zsh curl git neovim fastfetch eza shadow ncurses-terminfo-base
+elif command -v dnf >/dev/null 2>&1; then
+    $S dnf install -y zsh curl git neovim fastfetch eza shadow-utils
+fi
 
-# --- 4. Verzeichnisse & Config-Downloads ---
-mkdir -p ~/.config/nvim ~/.config/fastfetch
-curl -fsSL "$URL_NVIM_INIT" -o ~/.config/nvim/init.lua
-curl -fsSL "$URL_FASTFETCH" -o ~/.config/fastfetch/fastfetch.jsonc
+# --- 4. Verzeichnisse & Downloads ---
+mkdir -p "$HOME/.config/nvim" "$HOME/.config/fastfetch"
+curl -fsSL "$URL_NVIM_INIT" -o "$HOME/.config/nvim/init.lua"
+curl -fsSL "$URL_FASTFETCH" -o "$HOME/.config/fastfetch/fastfetch.jsonc"
 
 # --- 5. Die dynamische .zshrc Erstellung ---
-echo "📝 Generiere optimierte .zshrc für $OS_ID..."
+# Wir nutzen hier 'cat' ohne Bash-Variablen-Tricks
+echo "📝 Generiere .zshrc..."
 
-cat <<EOF > ~/.zshrc
+cat <<EOF > "$HOME/.zshrc"
 # --- Automatisch generiert am $(date) ---
 OS_ID="$OS_ID"
-OS_LIKE="$OS_LIKE"
 
-# Basis-Plugins & Theme (Zinit)
-ZINIT_HOME="\${XDG_DATA_HOME:-\${HOME}/.local/share}/zinit/zinit.git"
-[ ! -d "\$ZINIT_HOME" ] && mkdir -p "\$(dirname \$ZINIT_HOME)" && git clone https://github.com/zdharma-continuum/zinit.git "\$ZINIT_HOME"
-source "\${ZINIT_HOME}/zinit.zsh"
+# Zinit Installation
+ZINIT_HOME="\$HOME/.local/share/zinit/zinit.git"
+if [ ! -d "\$ZINIT_HOME" ]; then
+    mkdir -p "\$(dirname "\$ZINIT_HOME")"
+    git clone https://github.com/zdharma-continuum/zinit.git "\$ZINIT_HOME"
+fi
+source "\$ZINIT_HOME/zinit.zsh"
 
 zinit ice depth=1; zinit light romkatv/powerlevel10k
 zinit light zsh-users/zsh-syntax-highlighting
 zinit light zsh-users/zsh-autosuggestions
 
-# Fastfetch Start
-(( \$+commands[fastfetch] )) && fastfetch --config ~/.config/fastfetch/fastfetch.jsonc
-
-# --- System-spezifische Aliases ---
+# Fastfetch & Aliases
 alias l='eza -lagh --icons --group-directories-first'
 alias c='clear'
 alias x='exit'
+(( \$+commands[fastfetch] )) && fastfetch --config \$HOME/.config/fastfetch/fastfetch.jsonc
 
 EOF
 
-# --- 6. Effiziente Update-Logik einfügen ---
-# Hier wird nur der Code eingefügt, den das aktuelle System wirklich braucht!
-case "$OS_ID" in
-    arch|cachyos)
-        cat <<'EOF' >> ~/.zshrc
-update_system() {
-    echo "--- Arch Update ---"
-    if (( $+commands[yay] )); then yay -Syu --noconfirm; else sudo pacman -Syu --noconfirm; fi
-    sudo pacman -Rns $(pacman -Qdtq) --noconfirm 2>/dev/null
-}
-EOF
-        ;;
-    debian|ubuntu|trixie|kali)
-        cat <<'EOF' >> ~/.zshrc
-update_system() {
-    echo "--- Debian/APT Update ---"
-    sudo apt update && sudo apt upgrade -y && sudo apt autoremove -y
-}
-EOF
-        ;;
-    alpine)
-        cat <<'EOF' >> ~/.zshrc
-update_system() {
-    echo "--- Alpine Update ---"
-    sudo apk update && sudo apk upgrade
-}
-EOF
-        ;;
-esac
+# --- 6. Update-Logik (System-spezifisch) ---
+if [ "$OS_ID" = "debian" ] || [ "$OS_ID" = "ubuntu" ] || [ "$OS_ID" = "trixie" ]; then
+    echo "update_system() { $S apt-get update && $S apt-get upgrade -y; }" >> "$HOME/.zshrc"
+elif [ "$OS_ID" = "arch" ] || [ "$OS_ID" = "cachyos" ]; then
+    echo "update_system() { $S pacman -Syu --noconfirm; }" >> "$HOME/.zshrc"
+elif [ "$OS_ID" = "alpine" ]; then
+    echo "update_system() { $S apk update && $S apk upgrade; }" >> "$HOME/.zshrc"
+fi
+echo "alias u='update_system'" >> "$HOME/.zshrc"
 
-echo "alias u='update_system'" >> ~/.zshrc
+# --- 7. Finale ---
+# Prüfen ob ZSH die Default Shell ist (optional)
+if [ "$SHELL" != "$(command -v zsh)" ] && [ "$OS_ID" != "termux" ]; then
+    $S chsh -s "$(command -v zsh)" "$(whoami)"
+fi
 
-# --- 7. Finale & Start ---
-echo "✅ Setup fertig. Wechsel zu ZSH..."
+echo "✅ Setup fertig! Starte ZSH..."
 exec zsh -l
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