diff --git a/npm_install.py b/npm_install.py
index 622f808..670d324 100644
--- a/npm_install.py
+++ b/npm_install.py
@@ -14,6 +14,13 @@ MIN_NODEJS_VERSION = 18
 # Maximum supported Node.js version 
 MAX_NODEJS_VERSION = 21
 
+# Theme.Park settings (for --dark-mode or --tp-theme)
+# Popular themes: organizr, dark, plex, nord, dracula, space-gray, hotline, aquamarine
+TP_DOMAIN = "theme-park.dev"
+TP_SCHEME = "https"
+TP_COMMUNITY_THEME = "false"
+TP_DEFAULT_THEME = "organizr"
+
 # ========== UI / Spinner ==========
 
 class Spinner:
@@ -1678,15 +1685,9 @@ def main():
     parser.add_argument("--update", action="store_true",
                         help="Update mode: upgrade packages + rebuild frontend/backend without reconfiguring Angie.")
     parser.add_argument("--dark-mode", action="store_true",
-                        help="Inject Theme.Park CSS into frontend (see TP_* vars).")
-    parser.add_argument("--tp-domain", default=os.environ.get("TP_DOMAIN", ""),
-                        help="Theme.Park domain (e.g. theme-park.dev or *.github.io).")
-    parser.add_argument("--tp-community-theme", default=os.environ.get("TP_COMMUNITY_THEME", "false"),
-                        help="true = community-theme-options; false = theme-options.")
-    parser.add_argument("--tp-scheme", default=os.environ.get("TP_SCHEME", "https"),
-                        help="URL scheme (http/https).")
-    parser.add_argument("--tp-theme", default=os.environ.get("TP_THEME", "organizr"),
-                        help="Theme.Park theme name (e.g. organizr, catppuccin).")
+                       help=f"Enable dark theme (default: {TP_DEFAULT_THEME} from theme-park.dev)")
+    parser.add_argument("--tp-theme", default=None,
+                       help="Enable dark theme with specific theme name (e.g. nord, dracula, plex). Implies --dark-mode.")
     parser.add_argument("--debug", action="store_true",
                         help="Show detailed logs and progress.")
 
@@ -1755,12 +1756,24 @@ def main():
     else:
         print("IPv6: leaving entries (skipped IPv6 cleanup).")
 
-    if args.dark_mode:
-        apply_dark_mode(APP_FILEPATH="/opt/npm/frontend",
-                        TP_DOMAIN=args.tp_domain,
-                        TP_COMMUNITY_THEME=args.tp_community_theme,
-                        TP_SCHEME=args.tp_scheme,
-                        TP_THEME=args.tp_theme)
+    if args.tp_theme:
+        dark_mode_enabled = True
+        selected_theme = args.tp_theme
+    elif args.dark_mode:
+        dark_mode_enabled = True
+        selected_theme = TP_DEFAULT_THEME
+    else:
+        dark_mode_enabled = False
+        selected_theme = None
+
+    if dark_mode_enabled:
+        apply_dark_mode(
+            APP_FILEPATH="/opt/npm/frontend",
+            TP_DOMAIN=TP_DOMAIN,
+            TP_COMMUNITY_THEME=TP_COMMUNITY_THEME,
+            TP_SCHEME=TP_SCHEME,
+            TP_THEME=selected_theme
+        )
 
     create_systemd_units(ipv6_enabled=args.enable_ipv6)