diff --git a/src/config.sh b/src/config.sh
index 22c5065..ea804b7 100644
--- a/src/config.sh
+++ b/src/config.sh
@@ -53,6 +53,14 @@ export ESP_MOUNT="/mnt/boot/efi"
 export ROOT_LABEL="void-root"
 export EFI_LABEL="EFI"
 
+# Locale and user configuration
+export LOCALE="en_US.UTF-8"
+export TIMEZONE="UTC"
+export KEYBOARD="us"
+export USERNAME=""
+export USER_SHELL="/bin/bash"
+export USER_GROUPS="wheel,audio,video,storage,network"
+
 validate_size() {
   local size="$1"
   # Allow sizes like: 1GiB, 100MB, 50%, 100%
@@ -134,6 +142,12 @@ config_prompt_interactive() {
   prompt_with_default ESP_SIZE "ESP size (e.g. 1GiB)" "${ESP_SIZE}"
   prompt_with_default ROOT_END "Root partition end (e.g. 100% or 200GiB)" "${ROOT_END}"
   prompt_with_default SWAP_SIZE "Swap size (e.g. 4GiB, 0 to disable)" "${SWAP_SIZE}"
+
+  # Locale and user configuration
+  prompt_with_default LOCALE "Locale (e.g. en_US.UTF-8, de_DE.UTF-8)" "${LOCALE}"
+  prompt_with_default TIMEZONE "Timezone (e.g. UTC, Europe/Berlin, America/New_York)" "${TIMEZONE}"
+  prompt_with_default KEYBOARD "Keyboard layout (e.g. us, de-latin1, fr)" "${KEYBOARD}"
+  prompt_required USERNAME "Username for standard user" "${USERNAME}"
 }
 
 config_validate() {
@@ -143,6 +157,9 @@ config_validate() {
   if [[ -z "$HOSTNAME" ]]; then
     die "Hostname is required."
   fi
+  if [[ -z "$USERNAME" ]]; then
+    die "Username is required."
+  fi
 
   case "$FS_TYPE" in
     btrfs|ext4) ;;
@@ -169,6 +186,16 @@ config_validate() {
   if [[ "$SWAP_SIZE" != "0" ]] && ! validate_size "$SWAP_SIZE"; then
     die "Invalid swap size format: $SWAP_SIZE (expected: 4GiB, 8GB, 0 to disable)"
   fi
+
+  # Validate locale format (basic check)
+  if [[ ! "$LOCALE" =~ ^[a-z]{2}_[A-Z]{2}\.(UTF-8|utf8)$ ]]; then
+    log_warn "Locale format may be invalid: $LOCALE (expected: en_US.UTF-8)"
+  fi
+
+  # Validate username (alphanumeric, underscore, hyphen)
+  if [[ ! "$USERNAME" =~ ^[a-z_][a-z0-9_-]*$ ]]; then
+    die "Invalid username: $USERNAME (must start with lowercase letter or underscore, contain only lowercase alphanumeric, underscore, hyphen)"
+  fi
 }
 
 config_print_summary() {
@@ -178,6 +205,7 @@ config_print_summary() {
   : "${LUKS_VERSION:?LUKS version is required}"
   : "${MOUNT_ROOT:?Mount root is required}"
   : "${ESP_MOUNT:?ESP mount path is required}"
+  : "${USERNAME:?Username is required}"
   log_info "Configuration summary:"
   log_info "  Disk: $DISK"
   log_info "  Hostname: $HOSTNAME"
@@ -188,6 +216,10 @@ config_print_summary() {
   log_info "  Swap size: ${SWAP_SIZE}"
   log_info "  Mount root: $MOUNT_ROOT"
   log_info "  ESP mount: $ESP_MOUNT"
+  log_info "  Locale: $LOCALE"
+  log_info "  Timezone: $TIMEZONE"
+  log_info "  Keyboard: $KEYBOARD"
+  log_info "  Username: $USERNAME"
 }
 
 config_confirm_destructive() {