feat(nav): add collapsible sidebar and nested navigation groups

Refactor sidebar to support nested navigation groups for related entities.
Implement collapsible desktop sidebar with icon tooltips.

DESIGN.md

@@ -5,8 +5,9 @@
 - Pokopia Wiki 是一个面向 Pokopia 游戏资料的社区 Wiki。
 - 所有人都可以浏览 Wiki 内容。
 - 已注册并完成邮箱验证且拥有对应权限的用户可以创建、编辑、删除 Wiki 内容。
-- 前台以 Home 首页、Pokemon、Event Pokemon、栖息地、Event Habitats、物品、Event Items、Ancient Artifacts、材料单、每日 CheckList、Life、Automation、Dish、Events、Actions、Dream Island、Clothes 为主要浏览入口。
+- 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。
 - 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

frontend/src/App.vue

@@ -18,7 +18,8 @@ import {
   iconItem,
   iconLife,
   iconPokemon,
-  iconRecipe
+  iconRecipe,
+  type AppIcon
 } from './icons';
 import { getCurrentLocale, loadSystemWordings, onLocaleChange, setCurrentLocale } from './i18n';
 import { api, getAuthToken, onAuthTokenChange, setAuthToken, type AuthUser, type Language } from './services/api';
@@ -34,24 +35,66 @@ const languages = ref<Language[]>([
 let removeAuthListener: (() => void) | null = null;
 let removeLocaleListener: (() => void) | null = null;
 
-function inDevBadge() {
+type NavBadge = {
-  return { label: t('common.inDev'), tone: 'info' as const };
+  label: string;
+  tone?: 'info' | 'success' | 'warning' | 'danger' | 'neutral';
+};
+
+type NavLinkItem = {
+  label: string;
+  to: string;
+  icon?: AppIcon;
+  badge?: NavBadge;
+};
+
+type NavGroupItem = {
+  key: string;
+  label: string;
+  icon?: AppIcon;
+  children: NavLinkItem[];
+};
+
+type NavItem = NavLinkItem | NavGroupItem;
+
+function inDevBadge(): NavBadge {
+  return { label: t('common.inDev'), tone: 'info' };
 }
 
 function can(permissionKey: string) {
   return currentUser.value?.permissions.includes(permissionKey) === true;
 }
 
-const navItems = computed(() => {
+const navItems = computed<NavItem[]>(() => {
-  const items = [
+  const items: NavItem[] = [
     { label: t('nav.home'), to: '/', icon: iconHome },
-    { label: t('nav.pokemon'), to: '/pokemon', icon: iconPokemon },
+    {
-    { label: t('nav.eventPokemon'), to: '/event-pokemon', icon: iconEvent },
+      key: 'pokedex',
-    { label: t('nav.habitats'), to: '/habitats', icon: iconHabitat },
+      label: t('nav.pokedex'),
-    { label: t('nav.eventHabitats'), to: '/event-habitats', icon: iconEvent },
+      icon: iconPokemon,
-    { label: t('nav.items'), to: '/items', icon: iconItem },
+      children: [
-    { label: t('nav.eventItems'), to: '/event-items', icon: iconEvent },
+        { label: t('nav.mainGame'), to: '/pokemon', icon: iconPokemon },
-    { label: t('nav.ancientArtifacts'), to: '/ancient-artifacts', icon: iconArtifact },
+        { label: t('nav.event'), to: '/event-pokemon', icon: iconEvent }
+      ]
+    },
+    {
+      key: 'habitat-dex',
+      label: t('nav.habitatDex'),
+      icon: iconHabitat,
+      children: [
+        { label: t('nav.mainGame'), to: '/habitats', icon: iconHabitat },
+        { label: t('nav.event'), to: '/event-habitats', icon: iconEvent }
+      ]
+    },
+    {
+      key: 'collections',
+      label: t('nav.collections'),
+      icon: iconItem,
+      children: [
+        { label: t('nav.mainGame'), to: '/items', icon: iconItem },
+        { label: t('nav.event'), to: '/event-items', icon: iconEvent },
+        { label: t('nav.ancientArtifacts'), to: '/ancient-artifacts', icon: iconArtifact }
+      ]
+    },
     { label: t('nav.recipes'), to: '/recipes', icon: iconRecipe },
     { label: t('nav.automation'), to: '/automation', icon: iconAutomation, badge: inDevBadge() },
     { label: t('nav.dish'), to: '/dish', icon: iconDish, badge: inDevBadge() },

frontend/src/components/AppShell.vue

@@ -3,24 +3,54 @@ import { Icon } from '@iconify/vue';
 import { onBeforeUnmount, onMounted, ref, watch } from 'vue';
 import { useI18n } from 'vue-i18n';
 import { useRoute } from 'vue-router';
-import { iconClose, iconLogin, iconLogout, iconMenu, iconProfile, iconRegister, iconTranslate, type AppIcon } from '../icons';
+import {
+  iconChevronDown,
+  iconChevronRight,
+  iconClose,
+  iconLogin,
+  iconLogout,
+  iconMenu,
+  iconProfile,
+  iconRegister,
+  iconTranslate,
+  type AppIcon
+} from '../icons';
 import type { AuthUser, Language } from '../services/api';
 import PokeBallMark from './PokeBallMark.vue';
 import StatusBadge from './StatusBadge.vue';
 
+type NavBadge = {
+  label: string;
+  tone?: 'info' | 'success' | 'warning' | 'danger' | 'neutral';
+};
+
+type NavLinkItem = {
+  label: string;
+  to: string;
+  icon?: AppIcon;
+  badge?: NavBadge;
+};
+
+type NavGroupItem = {
+  key: string;
+  label: string;
+  icon?: AppIcon;
+  children: NavLinkItem[];
+};
+
+type NavItem = NavLinkItem | NavGroupItem;
+
+type SidebarTooltip = {
+  label: string;
+  top: number;
+  left: number;
+};
+
 defineProps<{
   currentUser: AuthUser | null;
   languages: Language[];
   locale: string;
-  navItems: Array<{
+  navItems: NavItem[];
-    label: string;
-    to: string;
-    icon?: AppIcon;
-    badge?: {
-      label: string;
-      tone?: 'info' | 'success' | 'warning' | 'danger' | 'neutral';
-    };
-  }>;
 }>();
 
 const emit = defineEmits<{
@@ -33,25 +63,61 @@ const route = useRoute();
 const copyrightYear = new Date().getFullYear();
 const languageMenu = ref<HTMLElement | null>(null);
 const languageMenuButton = ref<HTMLButtonElement | null>(null);
+const sideNav = ref<HTMLElement | null>(null);
 const languageMenuOpen = ref(false);
 const sidebarOpen = ref(false);
+const sidebarCollapsed = ref(false);
+const expandedNavGroups = ref<Set<string>>(new Set());
+const sidebarTooltip = ref<SidebarTooltip | null>(null);
+const sidebarTooltipTarget = ref<HTMLElement | null>(null);
 
 function closeLanguageMenu() {
   languageMenuOpen.value = false;
 }
 
+function clearSidebarTooltipTarget() {
+  sidebarTooltipTarget.value?.removeAttribute('aria-describedby');
+}
+
+function hideSidebarTooltip() {
+  clearSidebarTooltipTarget();
+  sidebarTooltipTarget.value = null;
+  sidebarTooltip.value = null;
+}
+
 function closeSidebar() {
   sidebarOpen.value = false;
   closeLanguageMenu();
+  hideSidebarTooltip();
 }
 
 function toggleSidebar() {
   sidebarOpen.value = !sidebarOpen.value;
   closeLanguageMenu();
+  hideSidebarTooltip();
+}
+
+function toggleSidebarCollapsed() {
+  sidebarCollapsed.value = !sidebarCollapsed.value;
+  closeLanguageMenu();
+  hideSidebarTooltip();
+}
+
+function toggleNavGroup(key: string) {
+  const nextGroups = new Set(expandedNavGroups.value);
+  if (nextGroups.has(key)) {
+    nextGroups.delete(key);
+  } else {
+    nextGroups.add(key);
+  }
+  expandedNavGroups.value = nextGroups;
+  closeLanguageMenu();
+  hideSidebarTooltip();
 }
 
 function toggleLanguageMenu() {
   languageMenuOpen.value = !languageMenuOpen.value;
+  hideSidebarTooltip();
 }
 
 function selectLocale(value: string) {
@@ -79,26 +145,108 @@ function requestLogout() {
   emit('logout');
 }
 
+function isDesktopSidebar() {
+  return typeof window !== 'undefined' && window.matchMedia('(min-width: 901px)').matches;
+}
+
+function canShowSidebarTooltip(collapsedOnly = true) {
+  return isDesktopSidebar() && (!collapsedOnly || sidebarCollapsed.value);
+}
+
+function setSidebarTooltip(label: string, target: HTMLElement) {
+  const rect = target.getBoundingClientRect();
+  clearSidebarTooltipTarget();
+  sidebarTooltipTarget.value = target;
+  target.setAttribute('aria-describedby', 'sidebar-tooltip');
+  sidebarTooltip.value = {
+    label,
+    top: rect.top + rect.height / 2,
+    left: rect.right + 10
+  };
+}
+
+function showSidebarTooltip(label: string, event: MouseEvent | FocusEvent, collapsedOnly = true) {
+  if (!canShowSidebarTooltip(collapsedOnly) || languageMenuOpen.value) {
+    return;
+  }
+
+  const target = event.currentTarget;
+  if (target instanceof HTMLElement) {
+    setSidebarTooltip(label, target);
+  }
+}
+
+function updateSidebarTooltipPosition() {
+  const target = sidebarTooltipTarget.value;
+  const currentTooltip = sidebarTooltip.value;
+  if (!target || !currentTooltip || !canShowSidebarTooltip()) {
+    hideSidebarTooltip();
+    return;
+  }
+
+  if (sideNav.value?.contains(target)) {
+    const navRect = sideNav.value.getBoundingClientRect();
+    const targetRect = target.getBoundingClientRect();
+    if (targetRect.bottom < navRect.top || targetRect.top > navRect.bottom) {
+      hideSidebarTooltip();
+      return;
+    }
+  }
+
+  setSidebarTooltip(currentTooltip.label, target);
+}
+
 function isNavActive(path: string) {
   return route.path === path || route.path.startsWith(`${path}/`);
 }
 
+function isNavGroup(item: NavItem): item is NavGroupItem {
+  return 'children' in item;
+}
+
+function isNavGroupActive(item: NavGroupItem) {
+  return item.children.some((child) => isNavActive(child.to));
+}
+
+function isNavGroupExpanded(item: NavGroupItem) {
+  return expandedNavGroups.value.has(item.key) || isNavGroupActive(item);
+}
+
+function navItemKey(item: NavItem) {
+  return isNavGroup(item) ? item.key : item.to;
+}
+
 watch(sidebarOpen, (open) => {
   document.body.classList.toggle('lock-scroll', open);
 });
 
+watch(sidebarCollapsed, (collapsed) => {
+  if (!collapsed) {
+    hideSidebarTooltip();
+  }
+});
+
 onMounted(() => {
   document.addEventListener('pointerdown', onDocumentPointerDown);
+  window.addEventListener('resize', updateSidebarTooltipPosition);
 });
 
 onBeforeUnmount(() => {
   document.removeEventListener('pointerdown', onDocumentPointerDown);
+  window.removeEventListener('resize', updateSidebarTooltipPosition);
   document.body.classList.remove('lock-scroll');
+  hideSidebarTooltip();
 });
 </script>
 
 <template>
-  <div class="app-shell" :class="{ 'app-shell--sidebar-open': sidebarOpen }">
+  <div
+    class="app-shell"
+    :class="{
+      'app-shell--sidebar-open': sidebarOpen,
+      'app-shell--sidebar-collapsed': sidebarCollapsed
+    }"
+  >
     <header class="mobile-topbar">
       <button
         class="sidebar-toggle"
@@ -124,33 +272,110 @@ onBeforeUnmount(() => {
 
     <aside id="app-sidebar" class="site-sidebar" :aria-label="t('nav.main')">
       <div class="site-sidebar__inner">
-        <RouterLink class="brand-lockup" to="/" aria-label="Pokopia Wiki" @click="closeSidebar">
+        <div class="site-sidebar__header">
-          <PokeBallMark size="42px" />
+          <RouterLink class="brand-lockup" to="/" aria-label="Pokopia Wiki" @click="closeSidebar">
-          <span>
+            <PokeBallMark size="42px" />
-            <span class="pokemon-word">Pokopia</span>
+            <span>
-            <span class="brand-subtitle">Community Wiki</span>
+              <span class="pokemon-word">Pokopia</span>
-          </span>
+              <span class="brand-subtitle">Community Wiki</span>
-        </RouterLink>
+            </span>
-
-        <nav class="side-nav" :aria-label="t('nav.main')">
-          <RouterLink
-            v-for="item in navItems"
-            :key="item.to"
-            class="side-nav__link"
-            :class="{ 'router-link-active': isNavActive(item.to) }"
-            :to="item.to"
-            @click="closeSidebar"
-          >
-            <Icon v-if="item.icon" :icon="item.icon" class="ui-icon side-nav__icon" aria-hidden="true" />
-            <span class="side-nav__label">{{ item.label }}</span>
-            <StatusBadge
-              v-if="item.badge"
-              class="side-nav__badge"
-              :label="item.badge.label"
-              :tone="item.badge.tone"
-              compact
-            />
           </RouterLink>
+
+          <button
+            class="sidebar-collapse-toggle"
+            type="button"
+            :aria-label="sidebarCollapsed ? t('nav.expandSidebar') : t('nav.collapseSidebar')"
+            :aria-expanded="!sidebarCollapsed"
+            aria-controls="app-sidebar"
+            @focus="showSidebarTooltip(sidebarCollapsed ? t('nav.expandSidebar') : t('nav.collapseSidebar'), $event, false)"
+            @blur="hideSidebarTooltip"
+            @pointerenter="showSidebarTooltip(sidebarCollapsed ? t('nav.expandSidebar') : t('nav.collapseSidebar'), $event, false)"
+            @pointerleave="hideSidebarTooltip"
+            @click="toggleSidebarCollapsed"
+          >
+            <Icon
+              :icon="iconChevronRight"
+              class="ui-icon sidebar-collapse-toggle__icon"
+              :class="{ 'sidebar-collapse-toggle__icon--expanded': !sidebarCollapsed }"
+              aria-hidden="true"
+            />
+          </button>
+        </div>
+
+        <nav ref="sideNav" class="side-nav" :aria-label="t('nav.main')" @scroll="updateSidebarTooltipPosition">
+          <template v-for="item in navItems" :key="navItemKey(item)">
+            <div v-if="isNavGroup(item)" class="side-nav__group" :class="{ 'side-nav__group--active': isNavGroupActive(item) }">
+              <button
+                class="side-nav__link side-nav__group-trigger"
+                :class="{ 'router-link-active': isNavGroupActive(item) }"
+                type="button"
+                :aria-expanded="isNavGroupExpanded(item)"
+                :aria-controls="`side-nav-group-${item.key}`"
+                :aria-label="item.label"
+                @focus="showSidebarTooltip(item.label, $event)"
+                @blur="hideSidebarTooltip"
+                @pointerenter="showSidebarTooltip(item.label, $event)"
+                @pointerleave="hideSidebarTooltip"
+                @click="toggleNavGroup(item.key)"
+              >
+                <Icon v-if="item.icon" :icon="item.icon" class="ui-icon side-nav__icon" aria-hidden="true" />
+                <span class="side-nav__label">{{ item.label }}</span>
+                <Icon
+                  :icon="isNavGroupExpanded(item) ? iconChevronDown : iconChevronRight"
+                  class="ui-icon side-nav__chevron"
+                  aria-hidden="true"
+                />
+              </button>
+              <div v-if="isNavGroupExpanded(item)" :id="`side-nav-group-${item.key}`" class="side-nav__children">
+                <RouterLink
+                  v-for="child in item.children"
+                  :key="child.to"
+                  class="side-nav__link side-nav__link--child"
+                  :class="{ 'router-link-active': isNavActive(child.to) }"
+                  :to="child.to"
+                  :aria-label="child.label"
+                  @focus="showSidebarTooltip(child.label, $event)"
+                  @blur="hideSidebarTooltip"
+                  @pointerenter="showSidebarTooltip(child.label, $event)"
+                  @pointerleave="hideSidebarTooltip"
+                  @click="closeSidebar"
+                >
+                  <Icon v-if="child.icon" :icon="child.icon" class="ui-icon side-nav__icon" aria-hidden="true" />
+                  <span class="side-nav__label">{{ child.label }}</span>
+                  <StatusBadge
+                    v-if="child.badge"
+                    class="side-nav__badge"
+                    :label="child.badge.label"
+                    :tone="child.badge.tone"
+                    compact
+                  />
+                </RouterLink>
+              </div>
+            </div>
+
+            <RouterLink
+              v-else
+              class="side-nav__link"
+              :class="{ 'router-link-active': isNavActive(item.to) }"
+              :to="item.to"
+              :aria-label="item.label"
+              @focus="showSidebarTooltip(item.label, $event)"
+              @blur="hideSidebarTooltip"
+              @pointerenter="showSidebarTooltip(item.label, $event)"
+              @pointerleave="hideSidebarTooltip"
+              @click="closeSidebar"
+            >
+              <Icon v-if="item.icon" :icon="item.icon" class="ui-icon side-nav__icon" aria-hidden="true" />
+              <span class="side-nav__label">{{ item.label }}</span>
+              <StatusBadge
+                v-if="item.badge"
+                class="side-nav__badge"
+                :label="item.badge.label"
+                :tone="item.badge.tone"
+                compact
+              />
+            </RouterLink>
+          </template>
         </nav>
 
         <div class="auth-actions">
@@ -162,6 +387,10 @@ onBeforeUnmount(() => {
               :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" />
@@ -185,29 +414,75 @@ onBeforeUnmount(() => {
             </div>
           </div>
           <template v-if="currentUser">
-            <RouterLink class="auth-user" to="/profile" :aria-label="t('nav.profile')" @click="closeSidebar">
+            <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" @click="requestLogout">
+            <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" />
-              {{ t('nav.logout') }}
+              <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" @click="closeSidebar">
+            <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" />
-              {{ t('nav.login') }}
+              <span class="auth-actions__label">{{ t('nav.login') }}</span>
             </RouterLink>
-            <RouterLink class="ui-button ui-button--primary ui-button--small" to="/register" @click="closeSidebar">
+            <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" />
-              {{ t('nav.register') }}
+              <span class="auth-actions__label">{{ t('nav.register') }}</span>
             </RouterLink>
           </template>
         </div>
       </div>
     </aside>
 
+    <div
+      v-if="sidebarTooltip"
+      id="sidebar-tooltip"
+      class="sidebar-tooltip"
+      role="tooltip"
+      :style="{ top: `${sidebarTooltip.top}px`, left: `${sidebarTooltip.left}px` }"
+    >
+      {{ sidebarTooltip.label }}
+    </div>
+
     <main class="page">
       <slot></slot>
     </main>

frontend/src/styles/main.css

@@ -109,6 +109,7 @@ svg {
   min-height: 100vh;
   display: grid;
   grid-template-columns: 252px minmax(0, 1fr);
+  transition: grid-template-columns 0.18s ease;
 }
 
 .container {
@@ -141,6 +142,14 @@ svg {
   padding: 18px 14px;
 }
 
+.site-sidebar__header {
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+}
+
 .brand-lockup {
   min-width: 0;
   display: inline-flex;
@@ -149,6 +158,44 @@ svg {
   width: fit-content;
 }
 
+.site-sidebar__header .brand-lockup {
+  flex: 1 1 auto;
+}
+
+.sidebar-collapse-toggle {
+  width: 38px;
+  min-width: 38px;
+  min-height: 38px;
+  display: inline-grid;
+  place-items: center;
+  border: 2px solid var(--line);
+  border-radius: var(--radius-control);
+  background: var(--surface);
+  color: var(--ink-soft);
+  cursor: pointer;
+  transition:
+    background 0.14s ease,
+    border-color 0.14s ease,
+    color 0.14s ease,
+    transform 0.14s ease;
+}
+
+.sidebar-collapse-toggle:hover {
+  border-color: var(--pokemon-blue);
+  background: rgba(255, 203, 5, 0.22);
+  color: var(--pokemon-blue-deep);
+}
+
+.sidebar-collapse-toggle__icon {
+  width: 20px;
+  height: 20px;
+  transition: transform 0.14s ease;
+}
+
+.sidebar-collapse-toggle__icon--expanded {
+  transform: rotate(180deg);
+}
+
 .pokemon-word {
   display: inline-block;
   color: var(--pokemon-yellow);
@@ -175,7 +222,33 @@ svg {
   align-content: start;
   gap: 6px;
   overflow-y: auto;
+  overscroll-behavior: contain;
   padding: 2px 0;
+  scrollbar-color: rgba(104, 116, 135, 0.2) transparent;
+  scrollbar-width: thin;
+}
+
+.side-nav:hover,
+.side-nav:focus-within {
+  scrollbar-color: rgba(104, 116, 135, 0.42) transparent;
+}
+
+.side-nav::-webkit-scrollbar {
+  width: 6px;
+}
+
+.side-nav::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.side-nav::-webkit-scrollbar-thumb {
+  border-radius: 999px;
+  background: rgba(104, 116, 135, 0.18);
+}
+
+.side-nav:hover::-webkit-scrollbar-thumb,
+.side-nav:focus-within::-webkit-scrollbar-thumb {
+  background: rgba(104, 116, 135, 0.38);
 }
 
 .side-nav__link {
@@ -208,6 +281,46 @@ svg {
   box-shadow: 0 2px 0 var(--line-strong);
 }
 
+.side-nav__group {
+  display: grid;
+  gap: 4px;
+}
+
+.side-nav__group-trigger {
+  width: 100%;
+  border: 0;
+  background: transparent;
+  text-align: left;
+  cursor: pointer;
+}
+
+.side-nav__group-trigger.router-link-active {
+  background: rgba(42, 117, 187, 0.12);
+  color: var(--pokemon-blue-deep);
+  box-shadow: inset 0 0 0 1px rgba(42, 117, 187, 0.18);
+}
+
+.side-nav__chevron {
+  width: 18px;
+  height: 18px;
+  margin-left: auto;
+  transition: transform 0.14s ease;
+}
+
+.side-nav__children {
+  display: grid;
+  gap: 4px;
+  margin-left: 15px;
+  padding-left: 10px;
+  border-left: 2px solid var(--line);
+}
+
+.side-nav__link--child {
+  min-height: 38px;
+  padding: 8px 10px;
+  font-size: 14px;
+}
+
 .side-nav__label {
   min-width: 0;
   overflow: hidden;
@@ -246,6 +359,12 @@ svg {
   justify-content: flex-start;
 }
 
+.auth-actions__label {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
 .language-menu {
   position: relative;
 }
@@ -405,6 +524,110 @@ svg {
   white-space: nowrap;
 }
 
+.sidebar-tooltip {
+  position: fixed;
+  z-index: 95;
+  max-width: min(230px, calc(100vw - 96px));
+  padding: 7px 10px;
+  border-radius: var(--radius-small);
+  background: #172036;
+  color: #ffffff;
+  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
+  font-size: 13px;
+  font-weight: 850;
+  line-height: 1.25;
+  overflow-wrap: anywhere;
+  pointer-events: none;
+  transform: translateY(-50%);
+}
+
+.sidebar-tooltip::before {
+  content: "";
+  position: absolute;
+  top: 50%;
+  right: 100%;
+  width: 0;
+  height: 0;
+  transform: translateY(-50%);
+  border-top: 6px solid transparent;
+  border-right: 6px solid #172036;
+  border-bottom: 6px solid transparent;
+}
+
+@media (min-width: 901px) {
+  .app-shell--sidebar-collapsed {
+    grid-template-columns: 72px minmax(0, 1fr);
+  }
+
+  .app-shell--sidebar-collapsed .site-sidebar__inner {
+    gap: 14px;
+    padding: 14px 10px;
+  }
+
+  .app-shell--sidebar-collapsed .site-sidebar__header {
+    display: grid;
+    justify-items: center;
+  }
+
+  .app-shell--sidebar-collapsed .site-sidebar__header .brand-lockup {
+    width: 44px;
+    justify-content: center;
+    gap: 0;
+  }
+
+  .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 .language-menu__glyph {
+    width: 0;
+    min-width: 0;
+    max-width: 0;
+    overflow: hidden;
+    opacity: 0;
+  }
+
+  .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 .language-menu__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;
+    margin-left: 0;
+  }
+
+  .app-shell--sidebar-collapsed .side-nav__children {
+    margin-left: 0;
+    padding-left: 0;
+    border-left: 0;
+  }
+
+  .app-shell--sidebar-collapsed .side-nav__link--child {
+    min-height: 38px;
+    padding: 8px;
+  }
+
+  .app-shell--sidebar-collapsed .side-nav__badge {
+    display: none;
+  }
+
+  .app-shell--sidebar-collapsed .site-sidebar .language-menu__dropdown {
+    bottom: 0;
+    left: calc(100% + 8px);
+  }
+}
+
 .page {
   position: relative;
   --page-padding-x: 24px;
@@ -2990,6 +3213,12 @@ button:disabled,
   .life-reaction-option,
   .life-action-tooltip,
   .life-search-control__clear,
+  .app-shell,
+  .sidebar-collapse-toggle,
+  .sidebar-collapse-toggle__icon,
+  .sidebar-tooltip,
+  .side-nav__link,
+  .side-nav__chevron,
   .reorderable-row,
   .reorderable-list-move,
   .drag-handle {
@@ -6161,6 +6390,10 @@ button:disabled,
     font-size: 11px;
   }
 
+  .sidebar-collapse-toggle {
+    display: none;
+  }
+
   .site-sidebar {
     position: fixed;
     inset: 0 auto 0 0;

system-wordings.ts

@@ -43,6 +43,11 @@ export const systemWordingMessages = {
     },
     nav: {
       home: 'Home',
+      pokedex: 'Pokedex',
+      habitatDex: 'Habitat Dex',
+      collections: 'Collections',
+      mainGame: 'Main Game',
+      event: 'Event',
       pokemon: 'Pokemon',
       eventPokemon: 'Event Pokemon',
       habitats: 'Habitats',
@@ -63,6 +68,8 @@ export const systemWordingMessages = {
       main: 'Main navigation',
       openMenu: 'Open navigation',
       closeMenu: 'Close navigation',
+      collapseSidebar: 'Collapse sidebar',
+      expandSidebar: 'Expand sidebar',
       language: 'Language',
       profile: 'Profile',
       login: 'Log in',
@@ -1288,6 +1295,11 @@ export const systemWordingMessages = {
     },
     nav: {
       home: '首页',
+      pokedex: 'Pokedex',
+      habitatDex: 'Habitat Dex',
+      collections: 'Collections',
+      mainGame: 'Main Game',
+      event: 'Event',
       pokemon: 'Pokemon',
       eventPokemon: 'Event Pokemon',
       habitats: '栖息地',
@@ -1308,6 +1320,8 @@ export const systemWordingMessages = {
       main: '主导航',
       openMenu: '打开导航',
       closeMenu: '关闭导航',
+      collapseSidebar: '收起侧边栏',
+      expandSidebar: '展开侧边栏',
       language: '语言',
       profile: '个人资料',
       login: '登录',