diff --git a/inc/helpers/header/jio-header-mobile.php b/inc/helpers/header/jio-header-mobile.php
index cc6c8cb5..05a22c57 100644
--- a/inc/helpers/header/jio-header-mobile.php
+++ b/inc/helpers/header/jio-header-mobile.php
@@ -63,7 +63,8 @@ if (!function_exists('jio_nav_mobile_content')) :
 		if (in_array('m_menu', (array) ($ctx['theme_positions'] ?? []), true)) {
 			$top_btns .= '<a href="javascript:;" class="toggle-theme toggle-radius" id="theme-toggle-mobile" title="'
 				. esc_attr__('切换亮暗色', 'jio') . '">';
-			$top_btns .= '<i class="fa fa-toggle-theme" aria-hidden="true"></i>';
+			// 与桌面端一致：Regular 面才是参考主题的空心太阳/月亮。
+			$top_btns .= '<i class="fa far fa-toggle-theme" aria-hidden="true"></i>';
 			$top_btns .= '</a>';
 		}
 		if ('center' !== ($ctx['mobile_layout'] ?? 'center')) {
diff --git a/inc/helpers/header/jio-header-navbar.php b/inc/helpers/header/jio-header-navbar.php
index 53b71354..84bcca44 100644
--- a/inc/helpers/header/jio-header-navbar.php
+++ b/inc/helpers/header/jio-header-navbar.php
@@ -324,7 +324,9 @@ if (!function_exists('jio_menu_button')) :
 		if (in_array('pc_nav', (array) ($ctx['theme_positions'] ?? []), true)) {
 			$utility_buttons .= '<a href="javascript:;" class="toggle-theme toggle-radius" id="theme-toggle-desktop" title="'
 				. esc_attr__('切换亮暗色', 'jio') . '">';
-			$utility_buttons .= '<i class="fa fa-toggle-theme" aria-hidden="true"></i>';
+			// 参考主题的太阳/月亮是空心字形；FA5 对应 Regular 面（far），
+			// 用 Solid（fa）会变成实心并显得更大更粗。
+			$utility_buttons .= '<i class="fa far fa-toggle-theme" aria-hidden="true"></i>';
 			$utility_buttons .= '</a>';
 		}
 		if (function_exists('jio_get_translate_language_btn')) {
diff --git a/inc/helpers/jio-float-buttons.php b/inc/helpers/jio-float-buttons.php
index 619c36f2..8f6ab561 100644
--- a/inc/helpers/jio-float-buttons.php
+++ b/inc/helpers/jio-float-buttons.php
@@ -168,7 +168,7 @@ if (!function_exists('jio_float_right')) :
 
 			switch ($type) {
 				case 'theme_mode':
-					$btn .= '<a' . $style . ' class="float-btn toggle-theme hover-show"' . jio_float_btn_tooltip_attr(__('切换主题', 'jio'), $is_mobile) . ' href="javascript:;"><i class="fa fa-toggle-theme"></i></a>';
+					$btn .= '<a' . $style . ' class="float-btn toggle-theme hover-show"' . jio_float_btn_tooltip_attr(__('切换主题', 'jio'), $is_mobile) . ' href="javascript:;"><i class="fa far fa-toggle-theme"></i></a>';
 					break;
 
 				case 'back_top':