diff --git a/assets/admin/src/schema/sections/global/logo.js b/assets/admin/src/schema/sections/global/logo.js
index 6c42307b..313138cf 100644
--- a/assets/admin/src/schema/sections/global/logo.js
+++ b/assets/admin/src/schema/sections/global/logo.js
@@ -13,7 +13,6 @@ export const logoSchema = {
     site_logo_dark: '',
     site_favicon: defaultFavicon,
     site_icon: defaultFavicon,
-    logo_width: 150,
     logo_text: '',
   },
   groups: [
@@ -24,7 +23,6 @@ export const logoSchema = {
       fields: [
         { key: 'site_logo', label: '站点 Logo', type: 'media', help: '建议尺寸 300x80，支持 PNG/SVG 透明背景' },
         { key: 'site_logo_dark', label: '暗色模式 Logo', type: 'media', help: '暗色模式下显示的 Logo，留空则使用默认 Logo' },
-        { key: 'logo_width', label: 'Logo 宽度 (px)', type: 'number', min: 50, max: 400, step: 10, help: '导航栏中 Logo 显示宽度' },
         { key: 'logo_text', label: 'Logo 文字', type: 'input', placeholder: '当无 Logo 图片时显示的文字', help: '同时作为首页标题和 alt 文本使用' },
       ],
     },
diff --git a/inc/helpers/header/jio-header-render.php b/inc/helpers/header/jio-header-render.php
index f1f8b26f..292eb8f4 100644
--- a/inc/helpers/header/jio-header-render.php
+++ b/inc/helpers/header/jio-header-render.php
@@ -41,14 +41,12 @@ if (!function_exists('jio_get_header_nav_context')) :
 		$brand_name  = $brand_name !== '' ? $brand_name : $site_name;
 		$logo_url    = function_exists('jio_get_site_logo_url') ? trim((string) jio_get_site_logo_url()) : '';
 		$logo_dark   = function_exists('jio_get_site_logo_dark_url') ? trim((string) jio_get_site_logo_dark_url()) : '';
-		$logo_width  = function_exists('jio_get_site_logo_width') ? jio_get_site_logo_width() : 150;
-		$logo_more   = $logo_width > 0
-			? 'style="height:36px;width:auto;max-width:' . max(36, (int) $logo_width) . 'px"'
-			: 'style="height:36px;width:auto"';
+		// 尺寸由 .navbar-logo > img 统一控制（height:36px / width:auto），
+		// 不叠加内联 max-width，否则 border-box 下的水平内边距会挤压图片。
 		$logo_html   = '';
 		if ($logo_url !== '' || $logo_dark !== '') {
 			$logo_html = function_exists('jio_get_adaptive_theme_img')
-				? jio_get_adaptive_theme_img($logo_url, $logo_dark, $brand_name, $logo_more)
+				? jio_get_adaptive_theme_img($logo_url, $logo_dark, $brand_name, '', false)
 				: '';
 		}
 
@@ -80,7 +78,6 @@ if (!function_exists('jio_get_header_nav_context')) :
 			'scroll_down_hide' => (!isset($settings['nav_scroll_down_hide']) || !empty($settings['nav_scroll_down_hide'])) && $nav_fixed,
 			'brand_name'       => $brand_name,
 			'logo_html'        => $logo_html,
-			'has_logo'         => $logo_html !== '',
 			'theme_positions'  => is_array($theme_positions) ? $theme_positions : [],
 			'can_publish'      => $can_publish,
 			'show_slide'       => $show_slide,
diff --git a/inc/helpers/template-tags/media-brand.php b/inc/helpers/template-tags/media-brand.php
index 9efdbae2..5b72d3d4 100644
--- a/inc/helpers/template-tags/media-brand.php
+++ b/inc/helpers/template-tags/media-brand.php
@@ -104,35 +104,20 @@ function jio_get_site_logo_text(): string {
 }
 endif;
 
-if (!function_exists('jio_get_site_logo_width')):
-/**
- * 获取导航 Logo 宽度
- *
- * @return int
- */
-function jio_get_site_logo_width(): int {
-    if (class_exists('\Jio\Settings\Settings')) {
-        return \Jio\Settings\Settings::logo_width();
-    }
-
-    $width = (int) jio_get_setting('logo_width', 150);
-    return max(50, min(400, $width));
-}
-endif;
-
 if (!function_exists('jio_get_adaptive_theme_img')):
 /**
  * Build a single light/dark adaptive image (legacy white-src/dark-src contract).
  *
  * theme.js syncThemeImages() swaps src via white-src / dark-src attributes.
  *
- * @param string $white_src Light mode image URL.
- * @param string $dark_src  Dark mode image URL.
- * @param string $alt       Alt text.
- * @param string $more      Extra attributes (already escaped by caller if needed).
+ * @param string       $white_src Light mode image URL.
+ * @param string       $dark_src  Dark mode image URL.
+ * @param string       $alt       Alt text.
+ * @param string       $more      Extra attributes (already escaped by caller if needed).
+ * @param string|bool  $lazy      'auto' follows lazy_other; false renders the real src up front.
  * @return string
  */
-function jio_get_adaptive_theme_img(string $white_src = '', string $dark_src = '', string $alt = '', string $more = ''): string {
+function jio_get_adaptive_theme_img(string $white_src = '', string $dark_src = '', string $alt = '', string $more = '', $lazy = 'auto'): string {
     $white_src = trim($white_src);
     $dark_src  = trim($dark_src);
 
@@ -148,6 +133,9 @@ function jio_get_adaptive_theme_img(string $white_src = '', string $dark_src = '
     if ($alt === '') {
         $alt = get_bloginfo('name');
     }
+    if ($lazy === 'auto') {
+        $lazy = jio_is_lazy('lazy_other');
+    }
 
     $is_dark = false;
     if (class_exists('\Jio\Settings\Settings') && method_exists('\Jio\Settings\Settings', 'initial_theme_mode')) {
@@ -155,6 +143,10 @@ function jio_get_adaptive_theme_img(string $white_src = '', string $dark_src = '
     }
     $this_src = $is_dark ? $dark_src : $white_src;
 
-    return '<img' . jio_get_lazy_attr('lazy_other', (string) $this_src) . ' white-src="' . esc_url($white_src) . '" dark-src="' . esc_url($dark_src) . '" alt="' . esc_attr($alt) . '"' . ($more !== '' ? ' ' . $more : '') . '>';
+    $src_attr = $lazy
+        ? jio_get_lazy_attr('lazy_other', (string) $this_src)
+        : ' src="' . esc_url((string) $this_src) . '"';
+
+    return '<img' . $src_attr . ' white-src="' . esc_url($white_src) . '" dark-src="' . esc_url($dark_src) . '" alt="' . esc_attr($alt) . '"' . ($more !== '' ? ' ' . $more : '') . '>';
 }
 endif;
diff --git a/src/Admin/Schema/GlobalSchema.php b/src/Admin/Schema/GlobalSchema.php
index 5cd1a7d8..52a41290 100644
--- a/src/Admin/Schema/GlobalSchema.php
+++ b/src/Admin/Schema/GlobalSchema.php
@@ -158,7 +158,6 @@ class GlobalSchema {
                         ['key' => 'logo', 'title' => 'Logo 设置', 'fields' => [
                             ['key' => 'site_logo', 'label' => '站点 Logo', 'type' => 'media', 'default' => ''],
                             ['key' => 'site_logo_dark', 'label' => '暗色模式 Logo', 'type' => 'media', 'default' => ''],
-                            ['key' => 'logo_width', 'label' => 'Logo 宽度', 'type' => 'number', 'default' => 150, 'min' => 50, 'max' => 400],
                             ['key' => 'logo_text', 'label' => 'Logo 文字', 'type' => 'input', 'default' => ''],
                         ]],
                         ['key' => 'favicon', 'title' => '站点图标', 'fields' => [
diff --git a/src/Frontend/InlineStyleBuilder.php b/src/Frontend/InlineStyleBuilder.php
index 57420924..79497dfd 100644
--- a/src/Frontend/InlineStyleBuilder.php
+++ b/src/Frontend/InlineStyleBuilder.php
@@ -18,7 +18,6 @@ class InlineStyleBuilder {
         $main_radius    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::main_radius() : 12;
         $container_max  = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::container_max_width() : 1200;
         $font_family    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::font_family() : 'system';
-        $logo_width     = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::logo_width() : 150;
         $sidebar_cfg    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::get_sidebar_config() : ['width' => 311, 'enabled' => true, 'position' => 'right'];
 		$list_settings = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::get_post_list_style_settings() : [];
 
@@ -47,7 +46,6 @@ class InlineStyleBuilder {
             '--font-display'           => $font_stacks['display'],
             '--font-ui'                => $font_stacks['ui'],
             '--font-heading'           => $font_stacks['ui'],
-            '--jio-logo-width'       => $logo_width . 'px',
             '--nav-height'             => '60px',
         ];
 
diff --git a/src/Settings/DisplayPageGroups.php b/src/Settings/DisplayPageGroups.php
index 4e1b2374..262436ff 100644
--- a/src/Settings/DisplayPageGroups.php
+++ b/src/Settings/DisplayPageGroups.php
@@ -149,7 +149,6 @@ trait DisplayPageGroups {
             'site_logo'                   => self::logo_url(),
             'site_logo_dark'              => self::logo_dark_url(),
             'logo_text'                   => self::logo_text(),
-            'logo_width'                  => self::logo_width(),
             'site_favicon'                => self::favicon_url(),
             'theme_mode'                  => self::theme_mode(),
             'theme_mode_button'           => self::get_theme_mode_button_positions(),
diff --git a/src/Settings/FacadeBulk.php b/src/Settings/FacadeBulk.php
index 110c6649..c82d95f6 100644
--- a/src/Settings/FacadeBulk.php
+++ b/src/Settings/FacadeBulk.php
@@ -199,14 +199,6 @@ trait FacadeBulk {
 
 
 
-    /** 获取导航 Logo 宽度 */
-    public static function logo_width(): int {
-        $width = (int) self::get_value('logo_width', 150);
-        return max(50, min(400, $width));
-    }
-
-
-
     /** 获取Favicon URL */
     public static function custom_favicon_url(): string {
         $favicon = (string) self::get_value('site_favicon', '');
diff --git a/tests/navigation/header-reference-contract.test.cjs b/tests/navigation/header-reference-contract.test.cjs
index 7815c168..ae4eef59 100644
--- a/tests/navigation/header-reference-contract.test.cjs
+++ b/tests/navigation/header-reference-contract.test.cjs
@@ -131,3 +131,22 @@ test('header source restores the reference typography and Bootstrap control dime
   assert.match(mainCss, /\.navbar-avatar\s*\{[^}]*margin-top:\s*3px;[^}]*width:\s*29px;[^}]*height:\s*29px;/s);
   assert.doesNotMatch(css, /\.jio-navbar-account|\.jio-nav-avatar|\.navbar-form \.toggle-radius:not|navbar-form\.flex\.ac\s*\{[^}]*min-height|\.navbar-search(?:\.show)?\s*\{[^}]*transform:/s);
 });
+
+test('nav logo is sized by CSS alone so the image keeps its aspect ratio', () => {
+  const mainCss = read('assets/css/main.css');
+  const render = read('inc/helpers/header/jio-header-render.php');
+  const helper = read('inc/helpers/template-tags/media-brand.php');
+
+  // The reference owns the logo box in CSS: fixed 36px height, auto width, no cap.
+  assert.match(mainCss, /\.navbar-logo > img \{\s*\n\s*height: 36px;\s*\n\s*padding: 0 30px;\s*\n\}/);
+
+  // A max-width on the <img> would cap the border box while the 60px horizontal
+  // padding stays inside it (box-sizing: border-box), squeezing wide logos.
+  assert.doesNotMatch(render, /max-width:\s*\d+px[^;]*"\s*\)/);
+  assert.doesNotMatch(render, /style="height:36px/);
+  assert.doesNotMatch(helper, /jio_get_site_logo_width|logo_width/);
+
+  // Nav logo loads its real src up front; only the shared helper still lazy-loads elsewhere.
+  assert.match(render, /jio_get_adaptive_theme_img\(\$logo_url, \$logo_dark, \$brand_name, '', false\)/);
+  assert.match(helper, /\$lazy = 'auto'/);
+});
diff --git a/tests/widget-system/post-thumbnail-render-harness.php b/tests/widget-system/post-thumbnail-render-harness.php
index 8b24603f..e0221874 100644
--- a/tests/widget-system/post-thumbnail-render-harness.php
+++ b/tests/widget-system/post-thumbnail-render-harness.php
@@ -16,7 +16,6 @@ namespace Jio\Settings {
 		public static function container_max_width(): int { return 1200; }
 		public static function font_family(): string { return 'system'; }
 		public static function font_family_custom(): string { return ''; }
-		public static function logo_width(): int { return 150; }
 		public static function get_sidebar_config(): array { return ['width' => 311]; }
 		public static function get_header_theme_config(): array { return []; }
 		public static function background_css(string $key): string { return ''; }