From e35bcc0f24d5e3d09b14da251472b9623ab902f5 Mon Sep 17 00:00:00 2001
From: ZhenShuo Leo <98386542+ZhenShuo2021@users.noreply.github.com>
Date: Wed, 25 Feb 2026 19:57:08 +0800
Subject: [PATCH 1/2] chore: logo alt text

---
 layouts/partials/header/basic.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/layouts/partials/header/basic.html b/layouts/partials/header/basic.html
index 9c9c9f13..517faeea 100644
--- a/layouts/partials/header/basic.html
+++ b/layouts/partials/header/basic.html
@@ -15,7 +15,7 @@
               width="{{ div $logo.Width 2 }}"
               height="{{ div $logo.Height 2 }}"
               class="logo max-h-20 max-w-20 object-scale-down object-left nozoom"
-              alt="">
+              alt="Site logo">
           {{ end }}
         </a>
       </div>

From 02a73971192898b56c05f1616ef87dae9e5f4ca8 Mon Sep 17 00:00:00 2001
From: ZhenShuo Leo <98386542+ZhenShuo2021@users.noreply.github.com>
Date: Wed, 25 Feb 2026 22:31:09 +0800
Subject: [PATCH 2/2] refactor: use css for logo switcher

---
 .prettierignore                    |  2 -
 assets/js/appearance.js            | 28 -------------
 layouts/partials/header/basic.html | 65 ++++++++++++++++++++----------
 3 files changed, 44 insertions(+), 51 deletions(-)

diff --git a/.prettierignore b/.prettierignore
index d2d823c7..457e2eb5 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -30,5 +30,3 @@ layouts/_default/index.json
 layouts/shortcodes/screenshot.html
 layouts/shortcodes/figure.html
 layouts/partials/hugo-embedded/shortcodes/figure-default.html
-
-assets/js/appearance.js
diff --git a/assets/js/appearance.js b/assets/js/appearance.js
index 1af7f713..6cb43b14 100644
--- a/assets/js/appearance.js
+++ b/assets/js/appearance.js
@@ -96,7 +96,6 @@ window.addEventListener("DOMContentLoaded", (event) => {
   }
 });
 
-
 var updateMeta = () => {
   var elem, style;
   elem = document.querySelector('body');
@@ -104,33 +103,6 @@ var updateMeta = () => {
   document.querySelector('meta[name="theme-color"]').setAttribute('content', style.backgroundColor);
 }
 
-{{ if and (.Site.Params.Logo) (.Site.Params.SecondaryLogo) }}
-{{ $primaryLogo := resources.Get .Site.Params.Logo }}
-{{ $secondaryLogo := resources.Get .Site.Params.SecondaryLogo }}
-{{ if and ($primaryLogo) ($secondaryLogo) }}
-var updateLogo = (targetAppearance) => {
-  var imgElems = document.querySelectorAll("img.logo");
-  var logoContainers = document.querySelectorAll("span.logo");
-  
-  targetLogoPath = 
-    targetAppearance == "{{ .Site.Params.DefaultAppearance }}" ?
-    "{{ $primaryLogo.RelPermalink }}" : "{{ $secondaryLogo.RelPermalink }}"
-  for (const elem of imgElems) {
-    elem.setAttribute("src", targetLogoPath)
-  }
-
-  {{ if eq $primaryLogo.MediaType.SubType "svg" }}
-  targetContent = 
-    targetAppearance == "{{ .Site.Params.DefaultAppearance }}" ?
-    `{{ $primaryLogo.Content | safeHTML }}` : `{{ $secondaryLogo.Content | safeHTML }}`
-  for (const container of logoContainers) {
-    container.innerHTML = targetContent;
-  }
-  {{ end }}
-}
-{{ end }}
-{{- end }}
-
 var getTargetAppearance = () => {
   return document.documentElement.classList.contains("dark") ? "dark" : "light"
 }
diff --git a/layouts/partials/header/basic.html b/layouts/partials/header/basic.html
index 517faeea..ac776b87 100644
--- a/layouts/partials/header/basic.html
+++ b/layouts/partials/header/basic.html
@@ -1,26 +1,49 @@
 <div class="main-menu flex items-center w-full gap-2 p-1 pl-0">
-  {{ if .Site.Params.Logo }}
-    {{ $logo := resources.Get .Site.Params.Logo }}
-    {{ if $logo }}
-      <div>
-        <a href="{{ "" | relLangURL }}" class="flex">
-          <span class="sr-only">{{ .Site.Title | markdownify }}</span>
-          {{ if eq $logo.MediaType.SubType "svg" }}
-            <span class="logo object-scale-down object-left nozoom">
-              {{ $logo.Content | safeHTML }}
-            </span>
-          {{ else }}
-            <img
-              src="{{ $logo.RelPermalink }}"
-              width="{{ div $logo.Width 2 }}"
-              height="{{ div $logo.Height 2 }}"
-              class="logo max-h-20 max-w-20 object-scale-down object-left nozoom"
-              alt="Site logo">
-          {{ end }}
-        </a>
-      </div>
-    {{ end }}
+  {{ $primary := resources.Get .Site.Params.Logo }}
+  {{ $secondary := resources.Get .Site.Params.SecondaryLogo }}
+
+  {{ if or $primary $secondary }}
+    <div>
+      <a href="{{ "" | relLangURL }}" class="flex">
+        <span class="sr-only">{{ .Site.Title | markdownify }}</span>
+
+        {{ if $primary }}
+          <div class="{{ cond $secondary "block dark:hidden" "" }}">
+            {{- if eq $primary.MediaType.SubType "svg" -}}
+              <span class="logo object-scale-down object-left nozoom">
+                {{ $primary.Content | safeHTML }}
+              </span>
+            {{ else }}
+              <img
+                src="{{ $primary.RelPermalink }}"
+                width="{{ div $primary.Width 2 }}"
+                height="{{ div $primary.Height 2 }}"
+                class="logo max-h-20 max-w-20 object-scale-down object-left nozoom"
+                alt="Site logo">
+            {{ end }}
+          </div>
+        {{ end }}
+
+        {{ if $secondary }}
+          <div class="hidden dark:block">
+            {{ if eq $secondary.MediaType.SubType "svg" }}
+              <span class="logo object-scale-down object-left nozoom">
+                {{ $secondary.Content | safeHTML }}
+              </span>
+            {{ else }}
+              <img
+                src="{{ $secondary.RelPermalink }}"
+                width="{{ div $secondary.Width 2 }}"
+                height="{{ div $secondary.Height 2 }}"
+                class="logo max-h-20 max-w-20 object-scale-down object-left nozoom"
+                alt="Site logo (dark mode)">
+            {{ end }}
+          </div>
+        {{ end }}
+      </a>
+    </div>
   {{ end }}
+
   {{ if not .Site.Params.disableTextInHeader | default true }}
     <a href="{{ "" | relLangURL }}" class="text-base font-medium truncate min-w-0 shrink">
       {{ .Site.Title | markdownify }}