diff --git a/scripts/transform.sh b/scripts/transform.sh
index 355b3d2..5f0ff67 100755
--- a/scripts/transform.sh
+++ b/scripts/transform.sh
@@ -6,6 +6,13 @@ set -euo pipefail
 
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/lib.sh"
 
+# --- Parse arguments ---
+
+DRY_RUN=false
+if [[ "${1:-}" == "--dry-run" ]]; then
+    DRY_RUN=true
+fi
+
 # ============================================================
 # Phase 1: Prerequisites & Detection
 # ============================================================
@@ -38,9 +45,15 @@ fi
 # ============================================================
 
 echo ""
-log "============================================"
-log "  Moonarch Transform — Pre-flight Summary"
-log "============================================"
+if $DRY_RUN; then
+    log "============================================"
+    log "  Moonarch Transform — Dry Run"
+    log "============================================"
+else
+    log "============================================"
+    log "  Moonarch Transform — Pre-flight Summary"
+    log "============================================"
+fi
 echo ""
 
 log "Wayland session:    detected"
@@ -65,10 +78,62 @@ log "  3. Disable conflicting DMs, enable greetd"
 log "  4. Overwrite ALL system configs (/etc/xdg/, /etc/greetd/, ...)"
 log "  5. Overwrite ALL user configs (~/.config/)"
 log "  6. Configure zsh, GTK themes, firewall, services"
+echo ""
+
+# Show package diff
+MISSING_OFFICIAL=$(comm -23 <(read_packages "$OFFICIAL_PACKAGES" | sort) <(pacman -Qqe | sort) 2>/dev/null || true)
+MISSING_AUR=""
+if [[ -f "$AUR_PACKAGES" ]]; then
+    MISSING_AUR=$(comm -23 <(read_packages "$AUR_PACKAGES" | sort) <(pacman -Qqe | sort) 2>/dev/null || true)
+fi
+
+if [[ -n "$MISSING_OFFICIAL" ]] || [[ -n "$MISSING_AUR" ]]; then
+    log "Packages to install:"
+    if [[ -n "$MISSING_OFFICIAL" ]]; then
+        OFFICIAL_COUNT=$(echo "$MISSING_OFFICIAL" | wc -l)
+        log "  Official ($OFFICIAL_COUNT):"
+        echo "$MISSING_OFFICIAL" | sed 's/^/    /'
+    fi
+    if [[ -n "$MISSING_AUR" ]]; then
+        AUR_COUNT=$(echo "$MISSING_AUR" | wc -l)
+        log "  AUR ($AUR_COUNT):"
+        echo "$MISSING_AUR" | sed 's/^/    /'
+    fi
+else
+    log "Packages:           all already installed"
+fi
+
+# Show config diff summary
+CHANGED_XDG=0
+CHANGED_BIN=0
+for src_dir in "$DEFAULTS_DIR/xdg/"*/; do
+    app_name="$(basename "$src_dir")"
+    dest_dir="$HOME/.config/$app_name"
+    if [[ -d "$dest_dir" ]]; then
+        if ! diff -rq "$src_dir" "$dest_dir" &>/dev/null 2>&1; then
+            ((CHANGED_XDG++)) || true
+        fi
+    else
+        ((CHANGED_XDG++)) || true
+    fi
+done
+for bin in "$DEFAULTS_DIR/bin/moonarch-"*; do
+    name=$(basename "$bin")
+    if ! cmp -s "$bin" "/usr/local/bin/$name" 2>/dev/null; then
+        ((CHANGED_BIN++)) || true
+    fi
+done
+log "Config changes:     $CHANGED_XDG XDG app(s), $CHANGED_BIN helper script(s)"
+
 echo ""
 err "This will REPLACE your current desktop configuration."
 echo ""
 
+if $DRY_RUN; then
+    log "Dry run complete — no changes were made."
+    exit 0
+fi
+
 if ! confirm "Proceed?"; then
     log "Transform cancelled."
     exit 0