diff --git a/src/main/apis/app/theme/index.ts b/src/main/apis/app/theme/index.ts
index 0dd2f908..faddd217 100644
--- a/src/main/apis/app/theme/index.ts
+++ b/src/main/apis/app/theme/index.ts
@@ -11,8 +11,6 @@ import { IWindowList } from '~/utils/enum'
 
 import windowManager from '../window/windowManager'
 
-let insertedCSSKeyMain: string | undefined
-
 export async function resolveThemes(): Promise<{ key: string; label: string }[]> {
   const files = fsWalk.walkSync(themesDir(), {
     followSymbolicLinks: true,
@@ -74,13 +72,9 @@ export async function readTheme(theme: string): Promise<string> {
 }
 
 export async function applyTheme(theme: string): Promise<void> {
-  theme = path.basename(theme)
-  const css = await readTheme(theme)
-  try {
-    const window = windowManager.get(IWindowList.SETTING_WINDOW)
-    await window?.webContents.removeInsertedCSS(insertedCSSKeyMain || '')
-    insertedCSSKeyMain = await window?.webContents.insertCSS(css)
-  } catch (e) {
-    console.error(e)
-  }
+  const basePath = path.basename(theme)
+  const css = await readTheme(basePath)
+  windowManager.get(IWindowList.SETTING_WINDOW)?.webContents.send('THEME_UPDATE', css)
+  windowManager.get(IWindowList.UPDATE_WINDOW)?.webContents.send('THEME_UPDATE', css)
+  windowManager.get(IWindowList.TRAY_WINDOW)?.webContents.send('THEME_UPDATE', css)
 }
diff --git a/src/main/lifeCycle/autoUpdater.ts b/src/main/lifeCycle/autoUpdater.ts
index a783f5b4..fcf477f5 100644
--- a/src/main/lifeCycle/autoUpdater.ts
+++ b/src/main/lifeCycle/autoUpdater.ts
@@ -47,9 +47,9 @@ const updateAvailableHandler = async (info: updater.UpdateInfo) => {
   }
 
   windowManager.create(IWindowList.UPDATE_WINDOW)
-  const updateWindow = windowManager.get(IWindowList.UPDATE_WINDOW)!
+  const updateWindow = windowManager.get(IWindowList.UPDATE_WINDOW)
 
-  updateWindow.webContents.once('did-finish-load', () => {
+  updateWindow?.webContents.once('did-finish-load', () => {
     updateWindow.webContents.send('SHOW_UPDATE_INFO', {
       type: 'update-available',
       title: lang === II18nLanguage.ZH_CN ? '发现新版本' : 'New Update Available',
@@ -58,7 +58,7 @@ const updateAvailableHandler = async (info: updater.UpdateInfo) => {
     })
   })
 
-  updateWindow.show()
+  updateWindow?.show()
 }
 
 const progressHandler = (progressObj: updater.ProgressInfo) => {
diff --git a/src/preload/index.ts b/src/preload/index.ts
index f8440c91..0a0b7f90 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -116,6 +116,16 @@ try {
     showFilePath(file: File) {
       return webUtils.getPathForFile(file)
     },
+    onThemeUpdate: (callback: (css: string) => void) => {
+      const subscription = (_: any, css: string) => {
+        injectCSS(css)
+        callback(css)
+      }
+      ipcRenderer.on('THEME_UPDATE', subscription)
+      return () => {
+        ipcRenderer.removeListener('THEME_UPDATE', subscription)
+      }
+    },
   })
 
   contextBridge.exposeInMainWorld('node', {
diff --git a/src/renderer/App.vue b/src/renderer/App.vue
index f1949a61..34a7c851 100644
--- a/src/renderer/App.vue
+++ b/src/renderer/App.vue
@@ -1,5 +1,5 @@
 <template>
-  <div id="layout" :key="pageReloadCount" class="h-full select-none">
+  <div id="layout" :key="pageReloadCount" class="h-full min-h-screen w-full select-none">
     <router-view />
     <UIServiceProvider />
   </div>
diff --git a/src/renderer/index.css b/src/renderer/index.css
index 4c005808..d1d4b4df 100644
--- a/src/renderer/index.css
+++ b/src/renderer/index.css
@@ -4,11 +4,15 @@
 
 @layer base {
   body {
-    @apply m-0 h-full overflow-hidden bg-bg p-0 font-[inherit] text-main;
+    @apply m-0 h-full w-full overflow-hidden bg-bg p-0 font-[inherit] text-main;
   }
 
   html {
-    @apply m-0 h-full p-0;
+    @apply m-0 h-full p-0 w-full;
+  }
+
+  #app {
+    @apply h-full w-full;
   }
 
   :focus {
diff --git a/src/renderer/pages/PicGoSetting.vue b/src/renderer/pages/PicGoSetting.vue
index cfb7ebd4..3ab6192b 100644
--- a/src/renderer/pages/PicGoSetting.vue
+++ b/src/renderer/pages/PicGoSetting.vue
@@ -1862,7 +1862,7 @@ import {
 import { marked } from 'marked'
 import type { IConfig } from 'piclist'
 import pkg from 'root/package.json'
-import { computed, onBeforeMount, reactive, ref, toRaw, watch } from 'vue'
+import { computed, onBeforeMount, onBeforeUnmount, onMounted, reactive, ref, toRaw, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useRouter } from 'vue-router'
 
@@ -2190,6 +2190,19 @@ onBeforeMount(() => {
   initData()
 })
 
+let unbindTheme: () => void
+onMounted(() => {
+  unbindTheme = window.electron.onThemeUpdate((_: string) => {
+    console.log('Applying theme CSS update:')
+  })
+})
+
+onBeforeUnmount(() => {
+  if (unbindTheme) {
+    unbindTheme()
+  }
+})
+
 async function loadThemes() {
   try {
     const themes = await window.electron.triggerRPC<{ key: string; label: string }[]>(
diff --git a/src/renderer/pages/UpdatePage.vue b/src/renderer/pages/UpdatePage.vue
index 4619951b..9bcbcb58 100644
--- a/src/renderer/pages/UpdatePage.vue
+++ b/src/renderer/pages/UpdatePage.vue
@@ -1,42 +1,49 @@
 <template>
-  <div class="update-page">
-    <div class="update-dialog">
+  <div class="flex h-full w-full items-center justify-center bg-bg-tertiary">
+    <div
+      class="relative h-11/12 w-11/12 shrink-0 overflow-auto rounded-md border border-border bg-surface-elevated shadow-lg"
+    >
       <!-- Header -->
-      <header class="dialog-header">
-        <h1 class="dialog-title">{{ updateInfo.title }}</h1>
-        <p v-if="updateInfo.version" class="dialog-version">
-          <span class="version-label">Version</span>
-          <span class="version-number">v{{ updateInfo.version }}</span>
+      <header class="p-5">
+        <h1 class="mb-3 text-3xl leading-tight font-bold tracking-wide text-main">{{ updateInfo.title }}</h1>
+        <p v-if="updateInfo.version" class="flex items-center gap-2 text-sm">
+          <span class="font-semibold text-secondary">Version</span>
+          <span class="rounded-sm bg-accent/30 px-2 py-0.5 font-bold text-main">v{{ updateInfo.version }}</span>
         </p>
       </header>
 
-      <div v-if="updateInfo.type !== 'downloading' && downloadProgress !== null" class="progress-section">
-        <div class="progress-info">
-          <span class="progress-label">{{ $t('pages.update.downloading') }}</span>
-          <span class="progress-percentage">{{ Math.round(downloadProgress) }}%</span>
+      <div v-if="updateInfo.type !== 'downloading' && downloadProgress !== null" class="bg-accent-hover/5 p-6">
+        <div class="mb-3 flex items-center justify-between">
+          <span class="text-sm font-semibold text-main">{{ $t('pages.update.downloading') }}</span>
+          <span class="text-sm font-semibold text-main tabular-nums">{{ Math.round(downloadProgress) }}%</span>
         </div>
-        <div class="progress-track">
-          <div class="progress-fill" :style="{ width: `${downloadProgress}%` }"></div>
+        <div class="relative h-2 w-full overflow-hidden rounded-full bg-white">
+          <div
+            class="absolute top-0 left-0 h-full rounded-full bg-[linear-gradient(90deg,var(--color-accent)_0%,var(--color-primary)_50%)] transition-all duration-300 ease-in-out"
+            :style="{ width: `${downloadProgress}%` }"
+          ></div>
         </div>
       </div>
 
-      <div class="dialog-content">
-        <div v-if="updateInfo.releaseNotes" class="release-notes">
-          <h2 class="content-title">{{ $t('pages.update.releaseNotes') }}</h2>
+      <div class="p-6">
+        <div v-if="updateInfo.releaseNotes" class="mb-5">
+          <h2 class="mb-2 text-base font-bold tracking-wide text-main">{{ $t('pages.update.releaseNotes') }}</h2>
           <div class="notes-body" v-html="renderMarkdown(updateInfo.releaseNotes)"></div>
         </div>
 
-        <div v-else-if="updateInfo.message" class="update-message">
-          <p>{{ updateInfo.message }}</p>
+        <div v-else-if="updateInfo.message" class="mb-6">
+          <p class="text-base leading-[1.7] text-main">{{ updateInfo.message }}</p>
         </div>
 
         <!-- Checkbox (only for update-available) -->
-        <div v-if="updateInfo.type === 'update-available'" class="settings-section">
-          <label class="checkbox-wrapper">
-            <input v-model="dontShowAgain" type="checkbox" class="checkbox-input" />
-            <span class="checkbox-box">
+        <div v-if="updateInfo.type === 'update-available'" class="pt-4">
+          <label class="group flex cursor-pointer items-center gap-3 select-none">
+            <input v-model="dontShowAgain" type="checkbox" class="peer sr-only" />
+            <span
+              class="relative flex h-[18px] w-[18px] shrink-0 items-center justify-center rounded-sm border-2 border-border bg-white transition-all duration-fast ease-apple group-hover:border-accent peer-checked:border-accent-hover"
+            >
               <svg
-                class="checkbox-icon"
+                class="scale-75 text-accent opacity-0 group-has-checked:scale-100 group-has-checked:opacity-100"
                 xmlns="http://www.w3.org/2000/svg"
                 width="14"
                 height="14"
@@ -50,34 +57,34 @@
                 <polyline points="20 6 9 17 4 12" />
               </svg>
             </span>
-            <span class="checkbox-label">{{ $t('pages.update.noMoreNotice') }}</span>
+            <span class="text-sm font-normal text-main">{{ $t('pages.update.noMoreNotice') }}</span>
           </label>
         </div>
       </div>
 
       <!-- Actions -->
-      <footer class="dialog-footer">
+      <footer class="flex justify-end gap-3 border-t border-border bg-surface p-5">
         <template v-if="updateInfo.type === 'update-available'">
-          <button class="btn btn-ghost" @click="goToDownloadPage">
+          <button class="btn-ghost" @click="goToDownloadPage">
             <Link2Icon class="btn-icon" />
             {{ $t('pages.update.goToDownloadPage') }}
           </button>
-          <button class="btn btn-primary" @click="downloadUpdate">
+          <button class="btn-primary" @click="downloadUpdate">
             <DownloadIcon class="btn-icon" />
             {{ $t('pages.update.download') }}
           </button>
         </template>
         <template v-else-if="updateInfo.type === 'downloading'">
-          <button class="btn btn-ghost" @click="closeWindow">
+          <button class="btn-ghost" @click="closeWindow">
             <XIcon class="btn-icon" />
             {{ $t('common.cancel') }}
           </button>
         </template>
         <template v-else-if="updateInfo.type === 'update-downloaded'">
-          <button class="btn btn-ghost" @click="closeWindow">
+          <button class="btn-ghost" @click="closeWindow">
             {{ $t('pages.update.later') }}
           </button>
-          <button class="btn btn-primary" @click="installUpdate">
+          <button class="btn-primary" @click="installUpdate">
             <DownloadIcon class="btn-icon" />
             {{ $t('pages.update.installNow') }}
           </button>
@@ -154,14 +161,19 @@ const closeWindow = () => {
   window.electron.sendRPC(IRPCActionType.CLOSE_CURRENT_WINDOW)
 }
 
+let unbindThemeListener: (() => void) | null = null
 onMounted(() => {
   window.electron.ipcRendererOn(SHOW_UPDATE_INFO, handleUpdateInfo)
   window.electron.ipcRendererOn(UPDATE_PROGRESS, handleUpdateProgress)
+  unbindThemeListener = window.electron.onThemeUpdate(_ => {
+    console.log('UpdatePage received THEME_UPDATE')
+  })
 })
 
 onBeforeUnmount(() => {
   window.electron.ipcRendererRemoveAllListeners(SHOW_UPDATE_INFO)
   window.electron.ipcRendererRemoveAllListeners(UPDATE_PROGRESS)
+  unbindThemeListener?.()
 })
 </script>
 
diff --git a/src/renderer/pages/css/UpdatePage.css b/src/renderer/pages/css/UpdatePage.css
index c8b4accc..a33fcd4f 100644
--- a/src/renderer/pages/css/UpdatePage.css
+++ b/src/renderer/pages/css/UpdatePage.css
@@ -1,546 +1,58 @@
-/* stylelint-disable property-no-deprecated */
 /* stylelint-disable selector-pseudo-class-no-unknown */
-
-/* Reset & Base */
-*,
-*::before,
-*::after {
-  box-sizing: border-box;
-  margin: 0;
-  padding: 0;
-}
-
-/* Page Container */
-.update-page {
-  display: flex;
-  justify-content: center;
-  align-items: center;
-  width: 100%;
-  height: 100%;
-  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
-}
-
-/* Dialog Card */
-.update-dialog {
-  position: relative;
-  overflow: auto;
-  border: 1px solid #e2e8f0;
-  border-radius: var(--radius-xl);
-  width: 90%;
-  height: 90%;
-  flex-shrink: 0;
-  background: white;
-  box-shadow:
-    0 4px 6px -1px rgb(0 0 0 / 10%),
-    0 2px 4px -1px rgb(0 0 0 / 6%);
-  animation: slide-up var(--transition-bounce-md);
-}
-
-@keyframes slide-up {
-  from {
-    opacity: 0;
-    transform: translateY(20px);
-  }
-
-  to {
-    opacity: 1;
-    transform: translateY(0);
-  }
-}
-
-.status-icon {
-  flex-shrink: 0;
-}
-
-.status-icon-spin {
-  animation: spin 1s linear infinite;
-}
-
-@keyframes spin {
-  to {
-    transform: rotate(360deg);
-  }
-}
-
-.status-text {
-  line-height: 1;
-}
-
-/* Header */
-.dialog-header {
-  padding: 1.25rem 1.5rem 1rem;
-}
-
-.dialog-title {
-  margin-bottom: 0.625rem;
-  font-size: 1.875rem;
-  font-weight: 700;
-  line-height: 1.2;
-  color: #1e293b;
-  letter-spacing: -0.025em;
-}
-
-.dialog-version {
-  display: flex;
-  align-items: center;
-  font-size: 0.9375rem;
-  gap: 0.5rem;
-}
-
-.version-label {
-  color: #64748b;
-}
-
-.version-number {
-  border-radius: var(--radius-sm);
-  padding: 0.125rem 0.5rem;
-  font-weight: 600;
-  background: #f1f5f9;
-  color: #475569;
-}
-
-/* Progress Section */
-.progress-section {
-  padding: 1.5rem;
-  background: #f8fafc;
-}
-
-.progress-info {
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  margin-bottom: 0.75rem;
-}
-
-.progress-label {
-  font-size: 0.875rem;
-  font-weight: 600;
-  color: #475569;
-}
-
-.progress-percentage {
-  font-size: 0.875rem;
-  font-weight: 700;
-  color: #1e293b;
-  font-feature-settings: "tnum";
-  font-variant-numeric: tabular-nums;
-}
-
-.progress-track {
-  position: relative;
-  overflow: hidden;
-  border-radius: 9999px;
-  width: 100%;
-  height: 6px;
-  background: #e2e8f0;
-}
-
-.progress-fill {
-  position: absolute;
-  top: 0;
-  left: 0;
-  border-radius: 9999px;
-  height: 100%;
-  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
-  transition: width var(--transition-bounce-md);
-}
-
-/* Content */
-.dialog-content {
-  padding: 1.5rem;
-}
-
-/* Release Notes */
-.release-notes {
-  margin-bottom: 1.5rem;
-}
-
-.content-title {
-  margin-bottom: 1rem;
-  font-size: 1rem;
-  font-weight: 700;
-  color: #1e293b;
-  letter-spacing: -0.01em;
-}
+@import "tailwindcss" reference;
+@import "../../assets/css/theme.css" reference;
+@import "../../assets/css/utilities.css" reference;
 
 .notes-body {
-  overflow-y: auto;
-  border-radius: var(--radius-lg);
-  padding: 1.25rem;
-  max-height: 195px;
-  font-size: 0.9375rem;
-  line-height: 1.5;
-  background: var(--color-background-tertiary);
-  color: var(--color-text-secondary);
+  @apply overflow-y-auto rounded-lg p-5 max-h-[200px] text-base leading-[1.5] bg-bg-tertiary text-secondary;
 }
 
 .notes-body :deep(h1),
 .notes-body :deep(h2),
 .notes-body :deep(h3) {
-  margin-top: 1.25rem;
-  margin-bottom: 0.5rem;
-  font-weight: 700;
-  color: #1e293b;
+  @apply font-bold text-main mt-5 mb-2;
 }
 
 .notes-body :deep(h1:first-child),
 .notes-body :deep(h2:first-child),
 .notes-body :deep(h3:first-child) {
-  margin-top: 0;
+  @apply mt-0;
 }
 
 .notes-body :deep(p) {
-  margin-bottom: 0.875rem;
+  @apply mb-2;
 }
 
 .notes-body :deep(ul),
 .notes-body :deep(ol) {
-  padding-left: 1.5rem;
-  margin: 0.875rem 0;
+  @apply list-inside my-3.5 pl-6;
 }
 
 .notes-body :deep(li) {
-  margin-bottom: 0.375rem;
+  @apply mb-1.5;
 }
 
-.notes-body :deep(code) {
-  border-radius: 4px;
-  padding: 0.125rem 0.375rem;
-  font-size: 0.875em;
-  background: #e2e8f0;
-  color: #334155;
+.notes-body :deep(a) {
+  @apply text-accent underline;
 }
 
-.notes-body :deep(pre) {
-  overflow-x: auto;
-  border-radius: var(--radius-md);
-  padding: 1rem;
-  margin: 0.875rem 0;
-  background: #e2e8f0;
+.notes-body :deep(a:hover) {
+  @apply text-accent-hover;
 }
 
-.notes-body :deep(pre code) {
-  padding: 0;
-  background: transparent;
-}
-
-/* Update Message */
-.update-message {
-  margin-bottom: 1.5rem;
-}
-
-.update-message p {
-  font-size: 0.9375rem;
-  line-height: 1.7;
-  color: #475569;
-}
-
-/* Settings Section */
-.settings-section {
-  border-top: 1px solid #e2e8f0;
-  padding-top: 1.25rem;
-}
-
-/* Custom Checkbox */
-.checkbox-wrapper {
-  display: flex;
-  align-items: center;
-  cursor: pointer;
-  gap: 0.75rem;
-  user-select: none;
-}
-
-.checkbox-input {
-  position: absolute;
-  width: 1px;
-  height: 1px;
-  overflow: hidden;
-  clip: rect(0, 0, 0, 0);
-  white-space: nowrap;
-  border: 0;
-}
-
-.checkbox-box {
-  position: relative;
-  display: flex;
-  justify-content: center;
-  align-items: center;
-  border: 2px solid #cbd5e1;
-  border-radius: var(--radius-sm);
-  width: 20px;
-  height: 20px;
-  background: white;
-  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
-  flex-shrink: 0;
-}
-
-.checkbox-icon {
-  opacity: 0;
-  transform: scale(0.8);
-  color: white;
-  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
-}
-
-.checkbox-input:checked + .checkbox-box {
-  border-color: #2563eb;
-  background: #2563eb;
-}
-
-.checkbox-input:checked + .checkbox-box .checkbox-icon {
-  opacity: 1;
-  transform: scale(1);
-}
-
-.checkbox-wrapper:hover .checkbox-box {
-  border-color: #2563eb;
-}
-
-.checkbox-input:focus-visible + .checkbox-box {
-  outline: 2px solid #2563eb;
-  outline-offset: 2px;
-}
-
-.checkbox-label {
-  font-size: 0.9375rem;
-  color: #475569;
-}
-
-/* Footer */
-.dialog-footer {
-  display: flex;
-  justify-content: flex-end;
-  border-top: 1px solid #e2e8f0;
-  padding: 1.25rem 1.5rem;
-  background: #f8fafc;
-  gap: 0.75rem;
+.notes-body :deep(img) {
+  @apply max-w-full rounded-md;
 }
 
 /* Buttons */
-.btn {
-  display: inline-flex;
-  justify-content: center;
-  align-items: center;
-  border: none;
-  border-radius: var(--radius-lg);
-  padding: 0.625rem 1.25rem;
-  font-size: 0.9375rem;
-  font-family: inherit;
-  font-weight: 600;
-  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
-  cursor: pointer;
-  gap: 0.5rem;
-  letter-spacing: -0.01em;
+.btn-ghost {
+  @apply  inline-flex justify-center items-center border-none rounded-lg px-5 py-2.5 text-sm font-[inherit] font-semibold transition-all duration-fast ease-standard cursor-pointer gap-2 disabled:opacity-50 disabled:cursor-not-allowed text-secondary bg-bg-secondary shadow-md hover:-translate-y-px hover:shadow-lg focus-visible:focus-ring;
 }
 
-.btn:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
+.btn-primary {
+  @apply  inline-flex justify-center items-center border-none rounded-lg px-5 py-2.5 text-sm font-[inherit] font-semibold transition-all duration-fast ease-standard cursor-pointer gap-2 disabled:opacity-50 disabled:cursor-not-allowed text-white bg-accent shadow-md hover:-translate-y-px hover:shadow-lg focus-visible:focus-ring;
 }
 
 .btn-icon {
-  flex-shrink: 0;
-}
-
-/* Primary Button */
-.btn-primary {
-  color: white;
-  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
-  box-shadow: 0 1px 3px 0 rgb(249 115 22 / 30%);
-}
-
-.btn-primary:hover:not(:disabled) {
-  transform: translateY(-1px);
-  box-shadow: 0 4px 12px 0 rgb(249 115 22 / 40%);
-}
-
-.btn-primary:active:not(:disabled) {
-  transform: translateY(0);
-}
-
-.btn-primary:focus-visible {
-  outline: 2px solid #f97316;
-  outline-offset: 2px;
-}
-
-/* Ghost Button */
-.btn-ghost {
-  border: 1px solid #e2e8f0;
-  background: white;
-  color: #475569;
-}
-
-.btn-ghost:hover:not(:disabled) {
-  border-color: #cbd5e1;
-  background: #f8fafc;
-  color: #1e293b;
-}
-
-.btn-ghost:focus-visible {
-  outline: 2px solid #2563eb;
-  outline-offset: 2px;
-}
-
-/* Responsive Design */
-@media (width <= 640px) {
-  .update-page {
-    padding: 1rem;
-  }
-
-  .update-dialog {
-    max-width: 100%;
-  }
-
-  .dialog-title {
-    font-size: 1.5rem;
-  }
-
-  .dialog-footer {
-    flex-direction: column-reverse;
-  }
-
-  .btn {
-    width: 100%;
-  }
-}
-
-@media (width <= 480px) {
-  .dialog-header {
-    padding: 1rem 1rem 0.75rem;
-  }
-
-  .dialog-title {
-    font-size: 1.375rem;
-  }
-
-  .dialog-content {
-    padding: 1.25rem 1rem;
-  }
-
-  .dialog-footer {
-    padding: 1rem;
-  }
-
-  .notes-body {
-    max-height: 240px;
-    font-size: 0.875rem;
-  }
-}
-
-/* Accessibility - Reduced Motion */
-@media (prefers-reduced-motion: reduce) {
-  *,
-  *::before,
-  *::after {
-    animation-duration: 0.01ms !important;
-    animation-iteration-count: 1 !important;
-    transition-duration: 0.01ms !important;
-  }
-
-  .status-icon-spin {
-    animation: none;
-  }
-}
-
-/* Dark Mode Support (if needed) */
-@media (prefers-color-scheme: dark) {
-  .update-page {
-    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
-  }
-
-  .update-dialog {
-    border-color: #334155;
-    background: #1e293b;
-  }
-
-  .dialog-title {
-    color: #f8fafc;
-  }
-
-  .version-label {
-    color: #94a3b8;
-  }
-
-  .version-number {
-    background: #334155;
-    color: #cbd5e1;
-  }
-
-  .progress-section,
-  .dialog-footer {
-    background: #0f172a;
-  }
-
-  .progress-label {
-    color: #cbd5e1;
-  }
-
-  .progress-percentage {
-    color: #f8fafc;
-  }
-
-  .progress-track {
-    background: #334155;
-  }
-
-  .content-title {
-    color: #f8fafc;
-  }
-
-  .notes-body {
-    background: #0f172a;
-    color: #cbd5e1;
-  }
-
-  .notes-body :deep(h1),
-  .notes-body :deep(h2),
-  .notes-body :deep(h3) {
-    color: #f8fafc;
-  }
-
-  .notes-body :deep(code) {
-    background: #334155;
-    color: #e2e8f0;
-  }
-
-  .notes-body :deep(pre) {
-    background: #334155;
-  }
-
-  .update-message p {
-    color: #cbd5e1;
-  }
-
-  .settings-section {
-    border-top-color: #334155;
-  }
-
-  .checkbox-box {
-    border-color: #475569;
-    background: #0f172a;
-  }
-
-  .checkbox-wrapper:hover .checkbox-box {
-    border-color: #3b82f6;
-  }
-
-  .checkbox-label {
-    color: #cbd5e1;
-  }
-
-  .dialog-footer {
-    border-top-color: #334155;
-  }
-
-  .btn-ghost {
-    border-color: #334155;
-    background: #0f172a;
-    color: #cbd5e1;
-  }
-
-  .btn-ghost:hover:not(:disabled) {
-    border-color: #475569;
-    background: #334155;
-    color: #f8fafc;
-  }
+  @apply shrink-0 w-6 h-6;
 }
diff --git a/src/universal/types/shims-tsx.d.ts b/src/universal/types/shims-tsx.d.ts
index b4421751..a1023b05 100644
--- a/src/universal/types/shims-tsx.d.ts
+++ b/src/universal/types/shims-tsx.d.ts
@@ -29,6 +29,7 @@ declare global {
         writeText: typeof clipboard.writeText
       }
       showFilePath: (file: File) => string
+      onThemeUpdate: (callback: (css: string) => void) => () => void
     }
     node: {
       path: {