diff --git a/misc/core.func b/misc/core.func
index f029821..768c7b9 100644
--- a/misc/core.func
+++ b/misc/core.func
@@ -223,12 +223,13 @@ __curl_err_handler() {
   [[ -n "$curl_msg" ]] && printf "%s\n" "$curl_msg" >&2
   exit 1
 }
-detect_os_type() {
-  if [[ -n "${var_os:-}" ]]; then
-    CORE_OS="$var_os"
-  else
-    CORE_OS="debian"
-  fi
+
+detect_os() {
+  case "$var_os" in
+  alpine) CORE_OS="alpine" ;;
+  debian | ubuntu) CORE_OS="debian" ;;
+  *) CORE_OS="unknown" ;;
+  esac
 }
 
 ### dev spinner ###
@@ -240,7 +241,6 @@ spinner_frames=('⠋' '⠙' '⠹' '⠸' '⠼' '⠴' '⠦' '⠧' '⠇' '⠏')
 # Ensure POSIX compatibility across Alpine and Debian/Ubuntu
 # === Spinner Start ===
 start_spinner() {
-  detect_os_type
   local msg="$1"
   local spin_i=0
   local interval=0.1