diff --git a/DESIGN.md b/DESIGN.md
index 4d76bb8..aef5824 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -8,6 +8,7 @@
 - 前台以 Home 首页、Pokedex（Main Game / Event）、Habitat Dex（Main Game / Event）、Collections（Main Game / Event / Ancient Artifacts）、材料单、每日 CheckList、Life、Automation、Dish、Events、Actions、Dream Island、Clothes 为主要浏览入口。
 - Home 首页路径为 `/`，用于聚合公开 Wiki 入口；Logo 导航回到 Home，用户可从 Home 进入核心资料、每日 CheckList、Life 和正在准备中的分区。
 - 桌面端使用侧边栏导航，侧边栏可折叠为图标栏；移动端继续使用抽屉式侧边栏。
+- 全局顶部导航栏承载语言切换、通知、User Profile 和登录 / 退出等账号操作；除 User Profile 可展示用户名外，顶部操作以图标按钮呈现。
 - 管理入口用于维护全局配置、语言、系统文案、列表排序和每日 CheckList。
 
 ## 技术栈
diff --git a/frontend/src/components/AppShell.vue b/frontend/src/components/AppShell.vue
index a34920a..006195f 100644
--- a/frontend/src/components/AppShell.vue
+++ b/frontend/src/components/AppShell.vue
@@ -248,25 +248,98 @@ onBeforeUnmount(() => {
       'app-shell--sidebar-collapsed': sidebarCollapsed
     }"
   >
-    <header class="mobile-topbar">
-      <button
-        class="sidebar-toggle"
-        type="button"
-        :aria-label="sidebarOpen ? t('nav.closeMenu') : t('nav.openMenu')"
-        :aria-expanded="sidebarOpen"
-        aria-controls="app-sidebar"
-        @click="toggleSidebar"
-      >
-        <Icon :icon="sidebarOpen ? iconClose : iconMenu" class="ui-icon" aria-hidden="true" />
-      </button>
+    <header class="site-topbar">
+      <div class="site-topbar__inner">
+        <div class="site-topbar__brand">
+          <button
+            class="sidebar-toggle"
+            type="button"
+            :aria-label="sidebarOpen ? t('nav.closeMenu') : t('nav.openMenu')"
+            :aria-expanded="sidebarOpen"
+            aria-controls="app-sidebar"
+            @click="toggleSidebar"
+          >
+            <Icon :icon="sidebarOpen ? iconClose : iconMenu" class="ui-icon" aria-hidden="true" />
+          </button>
 
-      <RouterLink class="brand-lockup brand-lockup--mobile" to="/" aria-label="Pokopia Wiki" @click="closeSidebar">
-        <PokeBallMark size="34px" />
-        <span>
-          <span class="pokemon-word">Pokopia</span>
-          <span class="brand-subtitle">Community Wiki</span>
-        </span>
-      </RouterLink>
+          <RouterLink class="brand-lockup brand-lockup--topbar" to="/" aria-label="Pokopia Wiki" @click="closeSidebar">
+            <PokeBallMark size="34px" />
+            <span>
+              <span class="pokemon-word">Pokopia</span>
+              <span class="brand-subtitle">Community Wiki</span>
+            </span>
+          </RouterLink>
+        </div>
+
+        <div class="site-topbar__spacer" aria-hidden="true"></div>
+
+        <div class="topbar-actions">
+          <div ref="languageMenu" class="language-menu" @keydown="onLanguageMenuKeydown">
+            <button
+              ref="languageMenuButton"
+              class="language-menu__trigger"
+              type="button"
+              :aria-label="t('nav.language')"
+              :aria-expanded="languageMenuOpen"
+              aria-haspopup="menu"
+              @click="toggleLanguageMenu"
+            >
+              <Icon :icon="iconTranslate" class="language-menu__icon" aria-hidden="true" />
+            </button>
+
+            <div v-if="languageMenuOpen" class="language-menu__dropdown" role="menu">
+              <button
+                v-for="language in languages"
+                :key="language.code"
+                class="language-menu__item"
+                :class="{ active: language.code === locale }"
+                type="button"
+                role="menuitemradio"
+                :aria-checked="language.code === locale"
+                @click="selectLocale(language.code)"
+              >
+                <span>{{ language.name }}</span>
+                <span class="language-menu__code">{{ language.code }}</span>
+              </button>
+            </div>
+          </div>
+
+          <template v-if="currentUser">
+            <NotificationBell :current-user="currentUser" />
+            <RouterLink class="auth-user" to="/profile" :aria-label="t('nav.profile')" @click="closeSidebar">
+              <Icon :icon="iconProfile" class="ui-icon auth-user__icon" aria-hidden="true" />
+              <span class="auth-user__name">{{ currentUser.displayName || currentUser.email }}</span>
+            </RouterLink>
+            <button
+              class="ui-button ui-button--ghost ui-button--small topbar-actions__icon-button"
+              type="button"
+              :aria-label="t('nav.logout')"
+              @click="requestLogout"
+            >
+              <Icon :icon="iconLogout" class="ui-icon" aria-hidden="true" />
+            </button>
+          </template>
+
+          <template v-else>
+            <RouterLink
+              class="ui-button ui-button--ghost ui-button--small topbar-actions__icon-button"
+              to="/login"
+              :aria-label="t('nav.login')"
+              @click="closeSidebar"
+            >
+              <Icon :icon="iconLogin" class="ui-icon" aria-hidden="true" />
+            </RouterLink>
+            <RouterLink
+              class="ui-button ui-button--primary ui-button--small topbar-actions__icon-button"
+              to="/register"
+              :aria-label="t('nav.register')"
+              @click="closeSidebar"
+            >
+              <Icon :icon="iconRegister" class="ui-icon" aria-hidden="true" />
+            </RouterLink>
+          </template>
+        </div>
+      </div>
     </header>
 
     <button class="site-sidebar-scrim" type="button" :aria-label="t('nav.closeMenu')" @click="closeSidebar"></button>
@@ -378,100 +451,6 @@ onBeforeUnmount(() => {
             </RouterLink>
           </template>
         </nav>
-
-        <div class="auth-actions">
-          <div ref="languageMenu" class="language-menu" @keydown="onLanguageMenuKeydown">
-            <button
-              ref="languageMenuButton"
-              class="language-menu__trigger"
-              type="button"
-              :aria-label="t('nav.language')"
-              :aria-expanded="languageMenuOpen"
-              aria-haspopup="menu"
-              @focus="showSidebarTooltip(t('nav.language'), $event)"
-              @blur="hideSidebarTooltip"
-              @pointerenter="showSidebarTooltip(t('nav.language'), $event)"
-              @pointerleave="hideSidebarTooltip"
-              @click="toggleLanguageMenu"
-            >
-              <Icon :icon="iconTranslate" class="language-menu__icon" aria-hidden="true" />
-              <span class="language-menu__glyph" aria-hidden="true">文/A</span>
-            </button>
-
-            <div v-if="languageMenuOpen" class="language-menu__dropdown" role="menu">
-              <button
-                v-for="language in languages"
-                :key="language.code"
-                class="language-menu__item"
-                :class="{ active: language.code === locale }"
-                type="button"
-                role="menuitemradio"
-                :aria-checked="language.code === locale"
-                @click="selectLocale(language.code)"
-              >
-                <span>{{ language.name }}</span>
-                <span class="language-menu__code">{{ language.code }}</span>
-              </button>
-            </div>
-          </div>
-          <template v-if="currentUser">
-            <NotificationBell :current-user="currentUser" />
-            <RouterLink
-              class="auth-user"
-              to="/profile"
-              :aria-label="t('nav.profile')"
-              @focus="showSidebarTooltip(t('nav.profile'), $event)"
-              @blur="hideSidebarTooltip"
-              @pointerenter="showSidebarTooltip(t('nav.profile'), $event)"
-              @pointerleave="hideSidebarTooltip"
-              @click="closeSidebar"
-            >
-              <Icon :icon="iconProfile" class="ui-icon auth-user__icon" aria-hidden="true" />
-              <span class="auth-user__name">{{ currentUser.displayName || currentUser.email }}</span>
-            </RouterLink>
-            <button
-              class="ui-button ui-button--ghost ui-button--small"
-              type="button"
-              :aria-label="t('nav.logout')"
-              @focus="showSidebarTooltip(t('nav.logout'), $event)"
-              @blur="hideSidebarTooltip"
-              @pointerenter="showSidebarTooltip(t('nav.logout'), $event)"
-              @pointerleave="hideSidebarTooltip"
-              @click="requestLogout"
-            >
-              <Icon :icon="iconLogout" class="ui-icon" aria-hidden="true" />
-              <span class="auth-actions__label">{{ t('nav.logout') }}</span>
-            </button>
-          </template>
-          <template v-else>
-            <RouterLink
-              class="ui-button ui-button--ghost ui-button--small"
-              to="/login"
-              :aria-label="t('nav.login')"
-              @focus="showSidebarTooltip(t('nav.login'), $event)"
-              @blur="hideSidebarTooltip"
-              @pointerenter="showSidebarTooltip(t('nav.login'), $event)"
-              @pointerleave="hideSidebarTooltip"
-              @click="closeSidebar"
-            >
-              <Icon :icon="iconLogin" class="ui-icon" aria-hidden="true" />
-              <span class="auth-actions__label">{{ t('nav.login') }}</span>
-            </RouterLink>
-            <RouterLink
-              class="ui-button ui-button--primary ui-button--small"
-              to="/register"
-              :aria-label="t('nav.register')"
-              @focus="showSidebarTooltip(t('nav.register'), $event)"
-              @blur="hideSidebarTooltip"
-              @pointerenter="showSidebarTooltip(t('nav.register'), $event)"
-              @pointerleave="hideSidebarTooltip"
-              @click="closeSidebar"
-            >
-              <Icon :icon="iconRegister" class="ui-icon" aria-hidden="true" />
-              <span class="auth-actions__label">{{ t('nav.register') }}</span>
-            </RouterLink>
-          </template>
-        </div>
       </div>
     </aside>
 
diff --git a/frontend/src/styles/main.css b/frontend/src/styles/main.css
index 81dde2a..9fc45a3 100644
--- a/frontend/src/styles/main.css
+++ b/frontend/src/styles/main.css
@@ -109,6 +109,7 @@ svg {
   min-height: 100vh;
   display: grid;
   grid-template-columns: 252px minmax(0, 1fr);
+  grid-template-rows: auto minmax(0, 1fr) auto;
   transition: grid-template-columns 0.18s ease;
 }
 
@@ -118,15 +119,67 @@ svg {
   padding: 0 24px;
 }
 
-.mobile-topbar,
 .site-sidebar-scrim {
   display: none;
 }
 
+.site-topbar {
+  position: sticky;
+  top: 0;
+  z-index: 45;
+  grid-column: 2;
+  border-bottom: 1px solid rgba(31, 42, 59, 0.12);
+  background: color-mix(in srgb, var(--surface) 90%, transparent);
+  backdrop-filter: blur(18px);
+}
+
+.site-topbar__inner {
+  width: min(100%, var(--container));
+  min-height: 64px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 14px;
+  margin: 0 auto;
+  padding: 10px 24px;
+}
+
+.site-topbar__brand {
+  min-width: 0;
+  display: none;
+  align-items: center;
+  gap: 10px;
+}
+
+.sidebar-toggle {
+  display: none;
+}
+
+.site-topbar__spacer {
+  flex: 1 1 auto;
+}
+
+.topbar-actions {
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 8px;
+}
+
+.topbar-actions__icon-button {
+  width: 44px;
+  min-width: 44px;
+  min-height: 44px;
+  padding: 0;
+}
+
 .site-sidebar {
   position: sticky;
   top: 0;
   z-index: 50;
+  grid-column: 1;
+  grid-row: 1 / span 3;
   align-self: start;
   height: 100dvh;
   border-right: 1px solid rgba(31, 42, 59, 0.12);
@@ -137,7 +190,7 @@ svg {
 .site-sidebar__inner {
   height: 100%;
   display: grid;
-  grid-template-rows: auto minmax(0, 1fr) auto;
+  grid-template-rows: auto minmax(0, 1fr);
   gap: 18px;
   padding: 18px 14px;
 }
@@ -347,24 +400,6 @@ svg {
   background: var(--pokemon-yellow);
 }
 
-.auth-actions {
-  display: grid;
-  align-content: end;
-  gap: 8px;
-  min-width: 0;
-}
-
-.auth-actions .ui-button {
-  width: 100%;
-  justify-content: flex-start;
-}
-
-.auth-actions__label {
-  min-width: 0;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
 .language-menu {
   position: relative;
 }
@@ -373,19 +408,14 @@ svg {
   position: relative;
 }
 
-.site-sidebar .notification-menu__trigger {
-  width: 100%;
-  min-height: 44px;
-  justify-content: flex-start;
-}
-
 .notification-menu__trigger {
-  min-height: 38px;
+  width: 44px;
+  min-width: 44px;
+  min-height: 44px;
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  gap: 8px;
-  padding: 7px 10px;
+  padding: 0;
   border: 2px solid var(--line);
   border-radius: var(--radius-control);
   background: var(--surface);
@@ -426,10 +456,15 @@ svg {
 }
 
 .notification-menu__label {
-  min-width: 0;
+  position: absolute !important;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
   overflow: hidden;
-  text-overflow: ellipsis;
+  clip: rect(0, 0, 0, 0);
   white-space: nowrap;
+  border: 0;
 }
 
 .notification-menu__badge {
@@ -467,13 +502,6 @@ svg {
   box-shadow: var(--shadow-raised);
 }
 
-.site-sidebar .notification-menu__dropdown {
-  top: auto;
-  right: auto;
-  bottom: calc(100% + 6px);
-  left: 0;
-}
-
 .notification-menu__header {
   display: flex;
   align-items: center;
@@ -658,19 +686,14 @@ svg {
   border-radius: 0;
 }
 
-.site-sidebar .language-menu__trigger {
-  width: 100%;
-  min-height: 44px;
-  justify-content: flex-start;
-}
-
 .language-menu__trigger {
-  min-height: 38px;
+  width: 44px;
+  min-width: 44px;
+  min-height: 44px;
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  gap: 6px;
-  padding: 7px 10px;
+  padding: 0;
   border: 2px solid var(--line);
   border-radius: var(--radius-control);
   background: var(--surface);
@@ -704,10 +727,6 @@ svg {
   height: 18px;
 }
 
-.language-menu__glyph {
-  white-space: nowrap;
-}
-
 .language-menu__dropdown {
   position: absolute;
   top: calc(100% + 6px);
@@ -723,14 +742,6 @@ svg {
   box-shadow: var(--shadow-raised);
 }
 
-.site-sidebar .language-menu__dropdown {
-  top: auto;
-  bottom: calc(100% + 6px);
-  right: auto;
-  left: 0;
-  width: min(220px, calc(100vw - 40px));
-}
-
 .language-menu__item {
   display: flex;
   align-items: center;
@@ -773,7 +784,7 @@ svg {
 
 .auth-user {
   min-height: 44px;
-  max-width: 100%;
+  max-width: min(220px, 32vw);
   display: inline-flex;
   align-items: center;
   gap: 8px;
@@ -853,6 +864,11 @@ svg {
     padding: 14px 10px;
   }
 
+  .app-shell--sidebar-collapsed .site-topbar__brand {
+    flex: 0 1 auto;
+    display: flex;
+  }
+
   .app-shell--sidebar-collapsed .site-sidebar__header {
     display: grid;
     justify-items: center;
@@ -865,11 +881,7 @@ svg {
   }
 
   .app-shell--sidebar-collapsed .site-sidebar__header .brand-lockup > span,
-  .app-shell--sidebar-collapsed .side-nav__label,
-  .app-shell--sidebar-collapsed .auth-user__name,
-  .app-shell--sidebar-collapsed .auth-actions__label,
-  .app-shell--sidebar-collapsed .notification-menu__label,
-  .app-shell--sidebar-collapsed .language-menu__glyph {
+  .app-shell--sidebar-collapsed .side-nav__label {
     width: 0;
     min-width: 0;
     max-width: 0;
@@ -878,20 +890,13 @@ svg {
   }
 
   .app-shell--sidebar-collapsed .side-nav__link,
-  .app-shell--sidebar-collapsed .auth-actions .ui-button,
-  .app-shell--sidebar-collapsed .auth-user,
-  .app-shell--sidebar-collapsed .site-sidebar .notification-menu__trigger,
-  .app-shell--sidebar-collapsed .site-sidebar .language-menu__trigger {
+  .app-shell--sidebar-collapsed .side-nav__group-trigger {
     justify-content: center;
     gap: 0;
     padding-right: 8px;
     padding-left: 8px;
   }
 
-  .app-shell--sidebar-collapsed .side-nav__group-trigger {
-    gap: 4px;
-  }
-
   .app-shell--sidebar-collapsed .side-nav__chevron {
     width: 14px;
     height: 14px;
@@ -913,19 +918,11 @@ svg {
     display: none;
   }
 
-  .app-shell--sidebar-collapsed .site-sidebar .language-menu__dropdown {
-    bottom: 0;
-    left: calc(100% + 8px);
-  }
-
-  .app-shell--sidebar-collapsed .site-sidebar .notification-menu__dropdown {
-    bottom: 0;
-    left: calc(100% + 8px);
-  }
 }
 
 .page {
   position: relative;
+  grid-column: 2;
   --page-padding-x: 24px;
   width: min(100%, var(--container));
   margin: 0 auto;
@@ -6843,27 +6840,39 @@ button:disabled,
 
   .app-shell {
     display: block;
-    padding-top: 58px;
+    padding-top: 60px;
   }
 
-  .mobile-topbar {
+  .site-topbar {
     position: fixed;
     inset: 0 0 auto;
     z-index: 55;
-    min-height: 58px;
-    display: flex;
-    align-items: center;
+  }
+
+  .site-topbar__inner {
+    min-height: 60px;
     gap: 10px;
     padding: 8px 12px;
-    border-bottom: 1px solid rgba(31, 42, 59, 0.12);
-    background: color-mix(in srgb, var(--surface) 90%, transparent);
-    backdrop-filter: blur(18px);
+  }
+
+  .site-topbar__brand {
+    flex: 1 1 auto;
+    display: flex;
+  }
+
+  .site-topbar__spacer {
+    display: none;
+  }
+
+  .topbar-actions {
+    flex: 0 0 auto;
+    gap: 6px;
   }
 
   .sidebar-toggle {
-    width: 40px;
-    min-width: 40px;
-    min-height: 40px;
+    width: 44px;
+    min-width: 44px;
+    min-height: 44px;
     display: inline-grid;
     place-items: center;
     border: 2px solid var(--line);
@@ -6878,14 +6887,22 @@ button:disabled,
     color: var(--pokemon-blue-deep);
   }
 
-  .brand-lockup--mobile .pokemon-word {
+  .brand-lockup--topbar {
+    min-width: 0;
+  }
+
+  .brand-lockup--topbar .pokemon-word {
     font-size: 22px;
   }
 
-  .brand-lockup--mobile .brand-subtitle {
+  .brand-lockup--topbar .brand-subtitle {
     font-size: 10px;
   }
 
+  .site-topbar .auth-user {
+    max-width: 130px;
+  }
+
   .sidebar-collapse-toggle {
     display: none;
   }
@@ -6929,11 +6946,6 @@ button:disabled,
     padding: 7px 8px 7px 34px;
   }
 
-  .auth-actions {
-    gap: 6px;
-    padding-top: 10px;
-  }
-
   .app-shell--sidebar-open .site-sidebar {
     transform: translateX(0);
   }
@@ -8137,40 +8149,54 @@ button:disabled,
 
 @media (max-width: 430px) {
   .app-shell {
-    padding-top: 52px;
+    padding-top: 56px;
   }
 
-  .mobile-topbar {
-    min-height: 52px;
+  .site-topbar__inner {
+    min-height: 56px;
     gap: 8px;
     padding: 6px 10px;
   }
 
   .sidebar-toggle {
-    width: 36px;
-    min-width: 36px;
-    min-height: 36px;
+    width: 44px;
+    min-width: 44px;
+    min-height: 44px;
   }
 
   .brand-lockup,
-  .brand-lockup--mobile {
+  .brand-lockup--topbar {
     gap: 8px;
   }
 
-  .brand-lockup--mobile .pokeball-mark {
+  .brand-lockup--topbar .pokeball-mark {
     --ball-size: 28px !important;
   }
 
-  .brand-lockup--mobile .pokemon-word {
+  .brand-lockup--topbar .pokemon-word {
     font-size: 19px;
     -webkit-text-stroke-width: 1.5px;
     text-shadow: 1px 2px 0 var(--pokemon-blue);
   }
 
-  .brand-lockup--mobile .brand-subtitle {
+  .brand-lockup--topbar .brand-subtitle,
+  .site-topbar .auth-user__name {
     display: none;
   }
 
+  .site-topbar .auth-user {
+    width: 44px;
+    min-width: 44px;
+    min-height: 44px;
+    justify-content: center;
+    gap: 0;
+    padding: 0;
+  }
+
+  .topbar-actions {
+    gap: 4px;
+  }
+
   .site-sidebar {
     width: min(84vw, 264px);
     max-width: calc(100vw - 28px);
@@ -8497,4 +8523,20 @@ button:disabled,
     border-left: 0;
     border-radius: 0;
   }
+
+  .site-topbar .topbar-actions__icon-button,
+  .site-topbar .auth-user,
+  .site-topbar .notification-menu__trigger,
+  .site-topbar .language-menu__trigger {
+    width: 44px;
+    min-width: 44px;
+    min-height: 44px;
+    padding: 0;
+  }
+}
+
+@media (max-width: 360px) {
+  .brand-lockup--topbar > span {
+    display: none;
+  }
 }