diff --git a/assets/alacritty/README.md b/assets/alacritty/README.md
new file mode 100644
index 0000000..ade03fe
--- /dev/null
+++ b/assets/alacritty/README.md
@@ -0,0 +1,109 @@
+# Alacritty Theme Synchronization
+
+This directory contains the theme synchronization system for Alacritty that automatically switches between Catppuccin light and dark themes based on your macOS system theme.
+
+## Files
+
+- `catppuccin-light.yml` - Catppuccin Latte (light) theme colors
+- `catppuccin-dark.yml` - Catppuccin Mocha (dark) theme colors
+- `README.md` - This documentation
+
+## Scripts
+
+The theme synchronization scripts are located in `/scripts/`:
+
+- `detect-system-theme.sh` - Detects current macOS system theme (light/dark)
+- `sync-alacritty-theme.sh` - Syncs Alacritty config with current system theme
+- `monitor-theme-changes.sh` - Continuously monitors for theme changes
+- `setup-alacritty-theme-sync.sh` - Setup script for initial configuration
+
+## Setup
+
+1. Run the setup script:
+   ```bash
+   ./scripts/setup-alacritty-theme-sync.sh
+   ```
+
+2. Choose your preferred method for automatic theme switching:
+
+### Option 1: Manual Sync
+Run the sync script whenever you want to update the theme:
+```bash
+./scripts/sync-alacritty-theme.sh
+```
+
+### Option 2: Background Monitoring
+Run the monitor script in the background:
+```bash
+./scripts/monitor-theme-changes.sh &
+```
+
+### Option 3: LaunchAgent (Recommended)
+Install as a system service that runs automatically:
+```bash
+cp assets/launchd/com.user.alacritty-theme-sync.plist ~/Library/LaunchAgents/
+launchctl load ~/Library/LaunchAgents/com.user.alacritty-theme-sync.plist
+```
+
+### Option 4: Shell Integration
+Add to your Fish shell configuration:
+```bash
+echo 'source /Users/danny/dotfiles/scripts/sync-alacritty-theme.sh' >> ~/.config/fish/config.fish
+```
+
+## How It Works
+
+1. The system detects your current macOS theme using `defaults read -g AppleInterfaceStyle`
+2. Based on the theme, it applies the appropriate Catppuccin color scheme:
+   - **Light theme** → Catppuccin Latte
+   - **Dark theme** → Catppuccin Mocha
+3. The Alacritty configuration is updated with the new colors
+4. Running Alacritty instances are restarted to apply the new theme
+
+## Theme Colors
+
+### Catppuccin Latte (Light)
+- Background: `#eff1f5` (base)
+- Foreground: `#4c4f69` (text)
+- Accent colors optimized for light backgrounds
+
+### Catppuccin Mocha (Dark)
+- Background: `#1e1e2e` (base)
+- Foreground: `#cdd6f4` (text)
+- Accent colors optimized for dark backgrounds
+
+## Troubleshooting
+
+### Theme not updating
+- Check if Alacritty config file exists and is writable
+- Verify the theme detection script works: `./scripts/detect-system-theme.sh`
+- Check logs in `/tmp/alacritty-theme-sync.log`
+
+### LaunchAgent not working
+- Check if the plist file is in the correct location
+- Verify permissions: `ls -la ~/Library/LaunchAgents/`
+- Check launchctl status: `launchctl list | grep alacritty`
+
+### Manual theme override
+If you want to manually set a theme regardless of system setting:
+```bash
+# Force light theme
+ALACRITTY_THEME=light ./scripts/sync-alacritty-theme.sh
+
+# Force dark theme  
+ALACRITTY_THEME=dark ./scripts/sync-alacritty-theme.sh
+```
+
+## Integration with NixOS
+
+The NixOS configuration in `nixos/home/danny/home.nix` provides the base Alacritty configuration. The theme sync scripts work on top of this configuration, dynamically updating the colors section while preserving all other settings.
+
+## Customization
+
+To customize the themes:
+
+1. Edit the color values in `catppuccin-light.yml` or `catppuccin-dark.yml`
+2. Run the sync script to apply changes
+3. The changes will persist until the next theme switch
+
+For more advanced customization, you can modify the sync script to use different theme files or add additional theme variants.
diff --git a/assets/alacritty/catppuccin-dark.yml b/assets/alacritty/catppuccin-dark.yml
new file mode 100644
index 0000000..8eaa383
--- /dev/null
+++ b/assets/alacritty/catppuccin-dark.yml
@@ -0,0 +1,30 @@
+# Catppuccin Mocha (Dark) theme for Alacritty
+colors:
+  # Catppuccin Mocha palette
+  primary:
+    background: '0x1e1e2e'  # base
+    foreground: '0xcdd6f4'  # text
+
+  cursor:
+    text: '0x1e1e2e'  # base
+    cursor: '0xf5e0dc'  # rosewater
+
+  normal:
+    black:   '0x45475a'  # surface1
+    red:     '0xf38ba8'  # red
+    green:   '0xa6e3a1'  # green
+    yellow:  '0xf9e2af'  # yellow
+    blue:    '0x89b4fa'  # blue
+    magenta: '0xf5c2e7'  # pink
+    cyan:    '0x94e2d5'  # teal
+    white:   '0xbac2de'  # subtext1
+
+  bright:
+    black:   '0x585b70'  # surface2
+    red:     '0xf38ba8'  # red
+    green:   '0xa6e3a1'  # green
+    yellow:  '0xf9e2af'  # yellow
+    blue:    '0x89b4fa'  # blue
+    magenta: '0xf5c2e7'  # pink
+    cyan:    '0x94e2d5'  # teal
+    white:   '0xa6adc8'  # subtext0
diff --git a/assets/alacritty/catppuccin-light.yml b/assets/alacritty/catppuccin-light.yml
new file mode 100644
index 0000000..bc574ae
--- /dev/null
+++ b/assets/alacritty/catppuccin-light.yml
@@ -0,0 +1,30 @@
+# Catppuccin Latte (Light) theme for Alacritty
+colors:
+  # Catppuccin Latte palette
+  primary:
+    background: '0xeff1f5'  # base
+    foreground: '0x4c4f69'  # text
+
+  cursor:
+    text: '0xeff1f5'  # base
+    cursor: '0xdc8a78'  # rosewater
+
+  normal:
+    black:   '0x5c5f77'  # surface1
+    red:     '0xd20f39'  # red
+    green:   '0x40a02b'  # green
+    yellow:  '0xdf8e1d'  # yellow
+    blue:    '0x1e40af'  # blue
+    magenta: '0xea76cb'  # pink
+    cyan:    '0x179299'  # teal
+    white:   '0xacb0be'  # subtext1
+
+  bright:
+    black:   '0x6c6f85'  # surface2
+    red:     '0xd20f39'  # red
+    green:   '0x40a02b'  # green
+    yellow:  '0xdf8e1d'  # yellow
+    blue:    '0x1e40af'  # blue
+    magenta: '0xea76cb'  # pink
+    cyan:    '0x179299'  # teal
+    white:   '0xbcc0cc'  # subtext0
diff --git a/assets/launchd/com.user.alacritty-theme-sync.plist b/assets/launchd/com.user.alacritty-theme-sync.plist
new file mode 100644
index 0000000..c23206d
--- /dev/null
+++ b/assets/launchd/com.user.alacritty-theme-sync.plist
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>com.user.alacritty-theme-sync</string>
+    
+    <key>ProgramArguments</key>
+    <array>
+        <string>/Users/danny/dotfiles/scripts/sync-alacritty-theme.sh</string>
+    </array>
+    
+    <key>StartInterval</key>
+    <integer>30</integer>
+    
+    <key>RunAtLoad</key>
+    <true/>
+    
+    <key>StandardOutPath</key>
+    <string>/tmp/alacritty-theme-sync.log</string>
+    
+    <key>StandardErrorPath</key>
+    <string>/tmp/alacritty-theme-sync-error.log</string>
+    
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>PATH</key>
+        <string>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
+    </dict>
+</dict>
+</plist>
diff --git a/nixos/home/danny/home.nix b/nixos/home/danny/home.nix
index 272206f..890b3f5 100644
--- a/nixos/home/danny/home.nix
+++ b/nixos/home/danny/home.nix
@@ -132,6 +132,7 @@
   };
 
   # Alacritty terminal configuration (managed by Home Manager)
+  # Note: Colors are managed by the theme sync script for dynamic switching
   programs.alacritty = {
     enable = true;
     settings = {
@@ -153,8 +154,8 @@
           program = "${pkgs.fish}/bin/fish";
         };
       };
+      # Default colors (Catppuccin Mocha - will be overridden by theme sync)
       colors = {
-        # Catppuccin Mocha palette
         primary = { background = "0x1e1e2e"; foreground = "0xcdd6f4"; };
         normal = {
           black = "0x45475a"; red = "0xf38ba8"; green = "0xa6e3a1"; yellow = "0xf9e2af";
diff --git a/scripts/detect-system-theme.sh b/scripts/detect-system-theme.sh
new file mode 100755
index 0000000..39ccd67
--- /dev/null
+++ b/scripts/detect-system-theme.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Detect macOS system theme (light/dark mode)
+# Returns "light" or "dark"
+
+# Get the current appearance setting
+appearance=$(defaults read -g AppleInterfaceStyle 2>/dev/null)
+
+if [ "$appearance" = "Dark" ]; then
+    echo "dark"
+else
+    echo "light"
+fi
diff --git a/scripts/monitor-theme-changes.sh b/scripts/monitor-theme-changes.sh
new file mode 100755
index 0000000..2548680
--- /dev/null
+++ b/scripts/monitor-theme-changes.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Monitor system theme changes and sync Alacritty theme
+# This script runs continuously and only updates Alacritty when the theme changes
+
+set -e
+
+# Get the directory where this script is located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SYNC_SCRIPT="$SCRIPT_DIR/sync-alacritty-theme.sh"
+
+# State file to track the last known theme
+STATE_FILE="/tmp/alacritty-theme-state"
+
+# Function to get current theme
+get_current_theme() {
+    "$SCRIPT_DIR/detect-system-theme.sh"
+}
+
+# Function to get last known theme
+get_last_theme() {
+    if [ -f "$STATE_FILE" ]; then
+        cat "$STATE_FILE"
+    else
+        echo ""
+    fi
+}
+
+# Function to save current theme
+save_theme() {
+    echo "$1" > "$STATE_FILE"
+}
+
+# Initial sync
+echo "Starting Alacritty theme monitor..."
+CURRENT_THEME=$(get_current_theme)
+echo "Current theme: $CURRENT_THEME"
+
+# Run initial sync
+"$SYNC_SCRIPT"
+save_theme "$CURRENT_THEME"
+
+# Monitor for changes
+while true; do
+    sleep 5  # Check every 5 seconds
+    
+    NEW_THEME=$(get_current_theme)
+    LAST_THEME=$(get_last_theme)
+    
+    if [ "$NEW_THEME" != "$LAST_THEME" ]; then
+        echo "Theme changed from '$LAST_THEME' to '$NEW_THEME'"
+        "$SYNC_SCRIPT"
+        save_theme "$NEW_THEME"
+    fi
+done
diff --git a/scripts/setup-alacritty-theme-sync.sh b/scripts/setup-alacritty-theme-sync.sh
new file mode 100755
index 0000000..905c7ae
--- /dev/null
+++ b/scripts/setup-alacritty-theme-sync.sh
@@ -0,0 +1,104 @@
+#!/bin/bash
+
+# Setup script for Alacritty theme synchronization
+# This script installs the necessary components to sync Alacritty with system theme
+
+set -e
+
+# Get the directory where this script is located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DOTFILES_DIR="$(dirname "$SCRIPT_DIR")"
+
+echo "Setting up Alacritty theme synchronization..."
+
+# Check if we're on macOS
+if [[ "$OSTYPE" != "darwin"* ]]; then
+    echo "Error: This script is designed for macOS"
+    exit 1
+fi
+
+# Check if Alacritty is installed
+if ! command -v alacritty >/dev/null 2>&1; then
+    echo "Warning: Alacritty is not installed or not in PATH"
+    echo "Please install Alacritty first: brew install alacritty"
+fi
+
+# Create Alacritty config directory if it doesn't exist
+ALACRITTY_CONFIG_DIR="$HOME/.config/alacritty"
+mkdir -p "$ALACRITTY_CONFIG_DIR"
+
+# Check if Alacritty config exists
+ALACRITTY_CONFIG="$ALACRITTY_CONFIG_DIR/alacritty.yml"
+if [ ! -f "$ALACRITTY_CONFIG" ]; then
+    echo "Creating default Alacritty configuration..."
+    cat > "$ALACRITTY_CONFIG" << 'EOF'
+# Alacritty configuration
+# This file will be automatically updated by the theme sync script
+
+window:
+  padding:
+    x: 8
+    y: 8
+  dynamic_padding: true
+  decorations: buttonless
+  opacity: 0.95
+  startup_mode: Fullscreen
+  option_as_alt: Both
+
+scrolling:
+  history: 10000
+  multiplier: 3
+
+font:
+  size: 13.0
+
+cursor:
+  style: Block
+  unfocused_hollow: true
+
+terminal:
+  shell:
+    program: /bin/fish
+
+# Colors will be automatically managed by theme sync
+colors:
+  primary:
+    background: '0x1e1e2e'
+    foreground: '0xcdd6f4'
+EOF
+    echo "Created default Alacritty config at $ALACRITTY_CONFIG"
+fi
+
+# Test the theme detection script
+echo "Testing theme detection..."
+CURRENT_THEME=$("$SCRIPT_DIR/detect-system-theme.sh")
+echo "Current system theme: $CURRENT_THEME"
+
+# Test the sync script
+echo "Testing theme synchronization..."
+"$SCRIPT_DIR/sync-alacritty-theme.sh"
+
+echo ""
+echo "Setup complete! Here's what was configured:"
+echo ""
+echo "1. Theme detection script: $SCRIPT_DIR/detect-system-theme.sh"
+echo "2. Theme sync script: $SCRIPT_DIR/sync-alacritty-theme.sh"
+echo "3. Theme monitor script: $SCRIPT_DIR/monitor-theme-changes.sh"
+echo "4. Alacritty config: $ALACRITTY_CONFIG"
+echo ""
+echo "To enable automatic theme switching, you have several options:"
+echo ""
+echo "Option 1 - Manual sync (run when needed):"
+echo "  $SCRIPT_DIR/sync-alacritty-theme.sh"
+echo ""
+echo "Option 2 - Background monitoring (runs continuously):"
+echo "  $SCRIPT_DIR/monitor-theme-changes.sh &"
+echo ""
+echo "Option 3 - LaunchAgent (automatic startup):"
+echo "  cp $DOTFILES_DIR/assets/launchd/com.user.alacritty-theme-sync.plist ~/Library/LaunchAgents/"
+echo "  launchctl load ~/Library/LaunchAgents/com.user.alacritty-theme-sync.plist"
+echo ""
+echo "Option 4 - Add to shell profile (runs on terminal startup):"
+echo "  echo 'source $SCRIPT_DIR/sync-alacritty-theme.sh' >> ~/.config/fish/config.fish"
+echo ""
+echo "Current theme applied: $CURRENT_THEME"
diff --git a/scripts/sync-alacritty-theme.sh b/scripts/sync-alacritty-theme.sh
new file mode 100755
index 0000000..2e94b0b
--- /dev/null
+++ b/scripts/sync-alacritty-theme.sh
@@ -0,0 +1,130 @@
+#!/bin/bash
+
+# Sync Alacritty theme with system theme
+# This script detects the current system theme and updates Alacritty configuration accordingly
+
+set -e
+
+# Get the directory where this script is located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DOTFILES_DIR="$(dirname "$SCRIPT_DIR")"
+
+# Paths
+THEME_DETECTION_SCRIPT="$SCRIPT_DIR/detect-system-theme.sh"
+LIGHT_THEME="$DOTFILES_DIR/assets/alacritty/catppuccin-light.yml"
+DARK_THEME="$DOTFILES_DIR/assets/alacritty/catppuccin-dark.yml"
+
+# Alacritty config locations (try different possible locations)
+ALACRITTY_CONFIG_LOCATIONS=(
+    "$HOME/.config/alacritty/alacritty.yml"
+    "$HOME/.alacritty.yml"
+    "$HOME/Library/Application Support/Alacritty/alacritty.yml"
+)
+
+# Find the actual Alacritty config file
+ALACRITTY_CONFIG=""
+for location in "${ALACRITTY_CONFIG_LOCATIONS[@]}"; do
+    if [ -f "$location" ]; then
+        ALACRITTY_CONFIG="$location"
+        break
+    fi
+done
+
+if [ -z "$ALACRITTY_CONFIG" ]; then
+    echo "Error: Could not find Alacritty configuration file"
+    echo "Tried locations:"
+    for location in "${ALACRITTY_CONFIG_LOCATIONS[@]}"; do
+        echo "  - $location"
+    done
+    exit 1
+fi
+
+# Detect current system theme
+if [ ! -f "$THEME_DETECTION_SCRIPT" ]; then
+    echo "Error: Theme detection script not found at $THEME_DETECTION_SCRIPT"
+    exit 1
+fi
+
+CURRENT_THEME=$("$THEME_DETECTION_SCRIPT")
+echo "Current system theme: $CURRENT_THEME"
+
+# Determine which theme file to use
+if [ "$CURRENT_THEME" = "light" ]; then
+    THEME_FILE="$LIGHT_THEME"
+    THEME_NAME="Catppuccin Latte (Light)"
+elif [ "$CURRENT_THEME" = "dark" ]; then
+    THEME_FILE="$DARK_THEME"
+    THEME_NAME="Catppuccin Mocha (Dark)"
+else
+    echo "Error: Unknown theme '$CURRENT_THEME'. Expected 'light' or 'dark'"
+    exit 1
+fi
+
+if [ ! -f "$THEME_FILE" ]; then
+    echo "Error: Theme file not found at $THEME_FILE"
+    exit 1
+fi
+
+echo "Applying theme: $THEME_NAME"
+
+# Create backup of current config
+BACKUP_FILE="${ALACRITTY_CONFIG}.backup.$(date +%Y%m%d_%H%M%S)"
+cp "$ALACRITTY_CONFIG" "$BACKUP_FILE"
+echo "Backup created: $BACKUP_FILE"
+
+# Create a temporary file for the new config
+TEMP_CONFIG=$(mktemp)
+
+# Function to merge theme colors into config
+merge_theme() {
+    local config_file="$1"
+    local theme_file="$2"
+    local output_file="$3"
+    
+    # Use yq to merge the theme colors into the config
+    # If yq is not available, fall back to a simpler approach
+    if command -v yq >/dev/null 2>&1; then
+        # Use yq for proper YAML merging
+        yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' "$config_file" "$theme_file" > "$output_file"
+    else
+        # Fallback: simple approach that replaces the colors section
+        # This is less robust but works without yq
+        awk '
+        BEGIN { in_colors = 0; colors_printed = 0 }
+        /^colors:/ { 
+            in_colors = 1
+            if (!colors_printed) {
+                print "colors:"
+                while ((getline line < "'"$theme_file"'") > 0) {
+                    if (line ~ /^colors:/) continue
+                    print "  " line
+                }
+                close("'"$theme_file"'")
+                colors_printed = 1
+            }
+            next
+        }
+        in_colors && /^[a-zA-Z]/ && !/^  / { in_colors = 0 }
+        !in_colors { print }
+        ' "$config_file" > "$output_file"
+    fi
+}
+
+# Merge the theme into the config
+merge_theme "$ALACRITTY_CONFIG" "$THEME_FILE" "$TEMP_CONFIG"
+
+# Replace the original config with the new one
+mv "$TEMP_CONFIG" "$ALACRITTY_CONFIG"
+
+echo "Alacritty theme synchronized successfully!"
+echo "Config file: $ALACRITTY_CONFIG"
+echo "Applied theme: $THEME_NAME"
+
+# Optionally, send a signal to running Alacritty instances to reload config
+# This requires Alacritty to be running with live config reload enabled
+if command -v osascript >/dev/null 2>&1; then
+    # Try to reload Alacritty config using AppleScript
+    osascript -e 'tell application "Alacritty" to quit' 2>/dev/null || true
+    # Restart Alacritty (you might want to adjust this based on your setup)
+    open -a Alacritty 2>/dev/null || true
+fi