diff --git a/UI/429d8ccd-3c00-40e1-9460-07b5f84a99c8.png b/UI/429d8ccd-3c00-40e1-9460-07b5f84a99c8.png
new file mode 100644
index 0000000..421395c
Binary files /dev/null and b/UI/429d8ccd-3c00-40e1-9460-07b5f84a99c8.png differ
diff --git a/UI/AI助手.png b/UI/AI助手.png
new file mode 100644
index 0000000..f1e224e
Binary files /dev/null and b/UI/AI助手.png differ
diff --git a/UI/background.png b/UI/background.png
new file mode 100644
index 0000000..9074cbe
Binary files /dev/null and b/UI/background.png differ
diff --git a/UI/background_2560x1440.png b/UI/background_2560x1440.png
new file mode 100644
index 0000000..d1a1612
Binary files /dev/null and b/UI/background_2560x1440.png differ
diff --git a/UI/c781e06b-a874-47a0-9c40-b679dd8f958c.png b/UI/c781e06b-a874-47a0-9c40-b679dd8f958c.png
new file mode 100644
index 0000000..933db3a
Binary files /dev/null and b/UI/c781e06b-a874-47a0-9c40-b679dd8f958c.png differ
diff --git a/UI/login.png b/UI/login.png
new file mode 100644
index 0000000..7d9b07b
Binary files /dev/null and b/UI/login.png differ
diff --git a/UI/main_page.png b/UI/main_page.png
new file mode 100644
index 0000000..a78f50a
Binary files /dev/null and b/UI/main_page.png differ
diff --git a/UI/发起请求.png b/UI/发起请求.png
new file mode 100644
index 0000000..4b8f0f3
Binary files /dev/null and b/UI/发起请求.png differ
diff --git a/UI/报销.png b/UI/报销.png
new file mode 100644
index 0000000..0ff7fbe
Binary files /dev/null and b/UI/报销.png differ
diff --git a/src/App.vue b/src/App.vue
index 08109f2..262293a 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,29 +1,46 @@
 <template>
   <!-- Login Page -->
-  <LoginView v-if="!loggedIn" @login="handleLogin" />
+  <LoginView
+    v-if="!loggedIn"
+    @login="handleLogin"
+    @recover-password="handleRecoverPassword"
+    @sso-login="handleSsoLogin"
+  />
 
   <!-- Main App -->
   <div v-else class="app">
     <SidebarRail
       :nav-items="navItems"
       :active-view="activeView"
-      @navigate="setView"
-      @open-chat="openChat"
+      @navigate="handleNavigate"
+      @open-chat="handleOpenChat"
     />
 
-    <main class="main">
+    <main
+      class="main"
+      :class="{
+        'chat-main': activeView === 'chat',
+        'overview-main': activeView === 'overview',
+        'requests-main': activeView === 'requests'
+      }"
+    >
       <TopBar
-        :current-view="currentView"
+        :current-view="topBarView"
         :search="search"
         :active-view="activeView"
+        :ranges="ranges"
+        :active-range="activeRange"
+        :custom-range="customRange"
         @update:search="search = $event"
+        @update:active-range="activeRange = $event"
+        @update:custom-range="customRange = $event"
         @batch-approve="toast('已筛出 23 个低风险单据，可进入批量通过确认。')"
-        @open-chat="openChat"
-        @new-application="openNewChat"
+        @open-chat="handleOpenChat"
+        @new-application="openTravelCreate"
       />
 
       <FilterBar
-        v-if="activeView !== 'chat'"
+        v-if="activeView !== 'chat' && activeView !== 'overview' && activeView !== 'requests'"
         :compact="activeView === 'overview'"
         :filters="filters"
         :ranges="ranges"
@@ -31,23 +48,26 @@
         @update:active-range="activeRange = $event"
       />
 
-      <DocFilterBar
-        v-if="activeView === 'chat'"
-        :doc-filters="docFilters"
-        :doc-months="docMonths"
-        :doc-types="docTypes"
-        :doc-statuses="docStatuses"
-      />
-
-      <section class="workarea">
+      <section
+        class="workarea"
+        :class="{
+          'chat-workarea': activeView === 'chat',
+          'requests-workarea': activeView === 'requests'
+        }"
+      >
         <OverviewView
           v-if="activeView === 'overview'"
           :filtered-requests="filteredRequests"
-          @ask="openChat"
+          @ask="handleOpenChat"
           @approve="handleApprove"
           @reject="handleReject"
         />
 
+        <TravelReimbursementCreateView
+          v-else-if="activeView === 'chat' && travelCreateMode"
+          @back-to-requests="backToRequests"
+        />
+
         <ChatView
           v-else-if="activeView === 'chat'"
           :documents="filteredDocuments"
@@ -61,7 +81,7 @@
           @send="sendMessage"
           @upload="handleUpload"
           @draft="draft = $event"
-          @select-case="openChat"
+          @select-case="handleOpenChat"
           @approve-case="toast(`${activeCase?.id} 已生成通过意见。`)"
           @reject-case="toast(`${activeCase?.id} 已转人工复核。`)"
         />
@@ -69,9 +89,10 @@
         <RequestsView
           v-else-if="activeView === 'requests'"
           :filtered-requests="filteredRequests"
-          @ask="openChat"
+          @ask="handleOpenChat"
           @approve="handleApprove"
           @reject="handleReject"
+          @create-request="openTravelCreate"
         />
 
         <PoliciesView v-else-if="activeView === 'policies'" />
@@ -80,8 +101,9 @@
       </section>
     </main>
 
-    <ToastNotification :toast-text="toastText" />
   </div>
+
+  <ToastNotification :toast-text="toastText" />
 </template>
 
 <script setup>
@@ -90,26 +112,37 @@ import './assets/styles/global.css'
 import SidebarRail from './components/layout/SidebarRail.vue'
 import TopBar from './components/layout/TopBar.vue'
 import FilterBar from './components/layout/FilterBar.vue'
-import DocFilterBar from './components/layout/DocFilterBar.vue'
 import ToastNotification from './components/shared/ToastNotification.vue'
 import LoginView from './views/LoginView.vue'
 import OverviewView from './views/OverviewView.vue'
 import ChatView from './views/ChatView.vue'
+import TravelReimbursementCreateView from './views/TravelReimbursementCreateView.vue'
 import RequestsView from './views/RequestsView.vue'
 import PoliciesView from './views/PoliciesView.vue'
 import AuditView from './views/AuditView.vue'
 
-import { ref, computed, reactive } from 'vue'
+import { ref, computed } from 'vue'
 import { useNavigation, navItems } from './composables/useNavigation.js'
 import { useRequests } from './composables/useRequests.js'
 import { useChat } from './composables/useChat.js'
 import { useToast } from './composables/useToast.js'
-import { documents, docTypes, docStatuses, docMonths } from './data/requests.js'
+import { documents } from './data/requests.js'
 
 const loggedIn = ref(false)
+const travelCreateMode = ref(false)
 
-function handleLogin() {
-  loggedIn.value = true
+function handleLogin(credentials) {
+  if (credentials.username && credentials.password) {
+    loggedIn.value = true
+  }
+}
+
+function handleRecoverPassword() {
+  toast('请联系系统管理员重置密码。')
+}
+
+function handleSsoLogin() {
+  toast('SSO 登录通道建设中。')
 }
 
 const { activeView, currentView, setView } = useNavigation()
@@ -117,19 +150,25 @@ const { requests, search, filters, ranges, activeRange, filteredRequests, approv
 const { messages, draft, uploadedFiles, messageList, activeCase, prompts, sendMessage, handleUpload, openChat, openNewChat } = useChat(activeView)
 const { toastText, toast } = useToast()
 
-/* ── Document management state ── */
 const docSearch = ref('')
-const docFilters = reactive({ month: '2026-04', type: '全部类型', status: '全部状态' })
+const customRange = ref({ start: '2024-07-06', end: '2024-07-12' })
 const travelPrompts = ['帮我提交出差申请', '预订机票', '预订酒店', '预订火车票', '查询差旅政策']
 
+const topBarView = computed(() => {
+  if (travelCreateMode.value) {
+    return {
+      title: '差旅报销助手',
+      desc: '帮你填写报销、检查材料、跟踪进度'
+    }
+  }
+  return currentView.value
+})
+
 const filteredDocuments = computed(() => {
   const key = docSearch.value.trim().toLowerCase()
   return documents.filter((doc) => {
     const matchesSearch = !key || `${doc.id}${doc.applicant}${doc.destination}${doc.type}`.toLowerCase().includes(key)
-    const matchesType = docFilters.type === '全部类型' || doc.type === docFilters.type
-    const matchesStatus = docFilters.status === '全部状态' || doc.status === docFilters.status
-    const matchesMonth = doc.date.startsWith(docFilters.month)
-    return matchesSearch && matchesType && matchesStatus && matchesMonth
+    return matchesSearch
   })
 })
 
@@ -142,20 +181,62 @@ function handleReject(request) {
   const msg = rejectRequest(request)
   toast(msg)
 }
+
+function handleNavigate(view) {
+  travelCreateMode.value = false
+  setView(view)
+}
+
+function handleOpenChat(request) {
+  travelCreateMode.value = false
+  openChat(request)
+}
+
+function openTravelCreate() {
+  travelCreateMode.value = true
+  activeView.value = 'chat'
+}
+
+function backToRequests() {
+  travelCreateMode.value = false
+  activeView.value = 'requests'
+}
 </script>
 
 <style scoped>
 .app {
   min-height: 100dvh;
   display: grid;
-  grid-template-columns: 256px minmax(0, 1fr);
+  grid-template-columns: 220px minmax(0, 1fr);
   background: var(--bg);
 }
 .main { min-width: 0; display: grid; grid-template-rows: auto auto minmax(0, 1fr); }
+.main.overview-main {
+  grid-template-rows: auto minmax(0, 1fr);
+}
+.main.chat-main {
+  height: 100dvh;
+  grid-template-rows: auto minmax(0, 1fr);
+  overflow: hidden;
+}
+.main.requests-main {
+  height: 100dvh;
+  grid-template-rows: auto minmax(0, 1fr);
+  overflow: hidden;
+}
 .workarea { overflow: auto; padding: 24px; }
+.workarea.chat-workarea {
+  min-height: 0;
+  overflow: hidden;
+}
+.workarea.requests-workarea {
+  min-height: 0;
+  overflow: hidden;
+  padding: 20px 24px;
+}
 
 @media (max-width: 1180px) {
-  .app { grid-template-columns: 236px minmax(0, 1fr); }
+  .app { grid-template-columns: 220px minmax(0, 1fr); }
 }
 @media (max-width: 760px) {
   .app { display: block; }
diff --git a/src/assets/background.png b/src/assets/background.png
new file mode 100644
index 0000000..d1a1612
Binary files /dev/null and b/src/assets/background.png differ
diff --git a/src/components/layout/FilterBar.vue b/src/components/layout/FilterBar.vue
index 214704d..e708ada 100644
--- a/src/components/layout/FilterBar.vue
+++ b/src/components/layout/FilterBar.vue
@@ -71,7 +71,7 @@ const emit = defineEmits(['update:activeRange'])
 .filters.compact {
   display: flex;
   justify-content: flex-end;
-  padding: 0 16px 12px;
+  padding: 8px 16px;
 }
 
 .filters label,
@@ -98,32 +98,39 @@ const emit = defineEmits(['update:activeRange'])
 
 .segmented {
   align-self: end;
-  display: inline-grid;
-  grid-auto-flow: column;
-  gap: 8px;
-  min-height: 30px;
-  padding: 0;
-  border: 0;
-  border-radius: 0;
-  background: transparent;
+  display: inline-flex;
+  gap: 0;
+  min-height: 40px;
+  padding: 3px;
+  border-radius: 10px;
+  background: #f1f5f9;
 }
 
 .segmented button {
-  min-height: 30px;
-  padding: 0 12px;
-  border: 1px solid #cbd5e1;
-  border-radius: 6px;
-  background: #fff;
-  color: #334155;
+  position: relative;
+  min-height: 34px;
+  padding: 0 20px;
+  border: none;
+  border-radius: 8px;
+  background: transparent;
+  color: #64748b;
   font-size: 14px;
-  font-weight: 400;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  white-space: nowrap;
+}
+
+.segmented button:hover:not(.active) {
+  color: #334155;
+  background: rgba(255, 255, 255, 0.5);
 }
 
 .segmented button.active {
-  background: #f1f5f9;
+  background: #fff;
   color: #1e293b;
-  font-weight: 500;
-  box-shadow: none;
+  font-weight: 600;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
 }
 
 @media (max-width: 980px) {
diff --git a/src/components/layout/SidebarRail.vue b/src/components/layout/SidebarRail.vue
index 22f20ab..315929c 100644
--- a/src/components/layout/SidebarRail.vue
+++ b/src/components/layout/SidebarRail.vue
@@ -1,18 +1,21 @@
 <template>
   <aside class="rail" aria-label="主导航">
     <div class="rail-brand">
-      <div class="brand-mark">星</div>
-      <div class="brand-copy">
-        <strong>星海科技</strong>
+      <div class="brand-mark" aria-hidden="true">
+        <svg viewBox="0 0 36 36">
+          <path d="M19.8 4.5c5.7 1.1 9.9 5.7 10.5 11.6-2.8-.9-5.5-.7-7.9.6-2.8 1.5-4.5 4.3-5.2 8.2-4.4-2.8-6.5-6.5-6.3-11.1.2-4.2 3.5-7.8 8.9-9.3Z" />
+          <path d="M9 7.6c-3 3.5-4 7.3-2.9 11.2 1.2 4.2 4.6 7 10.1 8.5-2 1.8-4.6 2.6-7.6 2.3C5.1 26.7 3.5 23.1 3.7 19 4 14.4 5.7 10.6 9 7.6Z" />
+        </svg>
       </div>
-      <button class="brand-toggle" type="button" aria-label="打开合规对话" @click="emit('openChat')">
-        <i class="pi pi-angle-left"></i>
+      <strong class="brand-name">星海科技</strong>
+      <button class="brand-toggle" type="button" aria-label="打开 AI 助手" @click="emit('openChat')">
+        <i class="pi pi-angle-double-left"></i>
       </button>
     </div>
 
-    <nav class="rail-nav">
+    <nav class="rail-nav" aria-label="功能导航">
       <button
-        v-for="item in navItems"
+        v-for="item in decoratedNavItems"
         :key="item.id"
         class="nav-btn"
         :class="{ active: activeView === item.id }"
@@ -20,30 +23,47 @@
         @click="emit('navigate', item.id)"
       >
         <span class="nav-icon" v-html="item.icon"></span>
-        <span class="nav-copy">
-          <strong>{{ item.label }}</strong>
-        </span>
+        <span class="nav-label">{{ item.displayLabel }}</span>
+        <span v-if="item.badge" class="nav-badge">{{ item.badge }}</span>
       </button>
     </nav>
 
-    <div class="rail-user">
-      <div class="user-avatar">张</div>
-      <div class="user-copy">
+    <button class="rail-user" type="button" aria-label="打开用户菜单">
+      <span class="user-avatar">张</span>
+      <span class="user-copy">
         <strong>张晓明</strong>
         <span>财务管理员</span>
-      </div>
+      </span>
       <i class="pi pi-angle-down"></i>
-    </div>
+    </button>
   </aside>
 </template>
 
 <script setup>
-defineProps({
+import { computed } from 'vue'
+
+const props = defineProps({
   navItems: { type: Array, required: true },
   activeView: { type: String, required: true }
 })
 
 const emit = defineEmits(['navigate', 'openChat'])
+
+const sidebarMeta = {
+  overview: { label: '总览' },
+  requests: { label: '差旅申请/报销' },
+  chat: { label: 'AI助手' },
+  policies: { label: '政策规则' },
+  audit: { label: '审计追踪' }
+}
+
+const decoratedNavItems = computed(() =>
+  props.navItems.map((item) => ({
+    ...item,
+    displayLabel: sidebarMeta[item.id]?.label ?? item.label,
+    badge: sidebarMeta[item.id]?.badge
+  }))
+)
 </script>
 
 <style scoped>
@@ -53,120 +73,117 @@ const emit = defineEmits(['navigate', 'openChat'])
   height: 100dvh;
   display: grid;
   grid-template-rows: auto 1fr auto;
-  gap: 0;
-  padding: 0;
-  background: #fff;
-  border-right: 1px solid var(--line);
+  background:
+    linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,251,250,.96)),
+    #fff;
+  border-right: 1px solid #dbe4ee;
+  box-shadow: 1px 0 0 rgba(15,23,42,.02);
   z-index: 20;
 }
 
-.rail-brand,
-.rail-user {
-  display: grid;
-  grid-template-columns: auto 1fr auto;
-  align-items: center;
-  gap: 8px;
-}
-
 .rail-brand {
-  padding: 16px;
-  border-bottom: 1px solid var(--line);
+  min-height: 86px;
+  display: grid;
+  grid-template-columns: 32px minmax(0, 1fr) 28px;
+  align-items: center;
+  gap: 10px;
+  padding: 22px 20px 18px;
 }
 
-.brand-mark,
-.user-avatar {
-  width: 42px;
-  height: 42px;
+.brand-mark {
+  width: 30px;
+  height: 30px;
   display: grid;
   place-items: center;
-  border-radius: 6px;
-  background: var(--primary);
-  color: #fff;
-  font-size: 16px;
-  font-weight: 700;
+  color: #07936f;
 }
 
-.user-avatar {
-  width: 32px;
-  height: 32px;
-  border-radius: 999px;
-  background: #e2f6ef;
-  color: #047857;
+.brand-mark svg {
+  width: 30px;
+  height: 30px;
+  fill: currentColor;
 }
 
-.brand-copy,
-.user-copy,
-.nav-copy {
+.brand-name {
   min-width: 0;
-  display: grid;
-}
-
-.brand-copy strong,
-.user-copy strong,
-.nav-copy strong {
-  color: var(--ink);
-  font-size: 14px;
-}
-
-.user-copy span,
-.nav-copy small {
-  margin-top: 2px;
-  color: var(--muted);
-  font-size: 12px;
-  line-height: 1.3;
+  color: #0f172a;
+  font-size: 16px;
+  font-weight: 800;
+  letter-spacing: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .brand-toggle {
   width: 28px;
-  min-height: 28px;
+  height: 28px;
   display: grid;
   place-items: center;
   border: 0;
-  border-radius: 6px;
+  border-radius: 7px;
   background: transparent;
-  color: #94a3b8;
+  color: #718096;
+  transition: background 180ms var(--ease), color 180ms var(--ease);
+}
+
+.brand-toggle:hover {
+  background: #eef7f4;
+  color: #07936f;
 }
 
 .rail-nav {
   display: grid;
-  gap: 4px;
   align-content: start;
-  padding: 16px 12px;
+  gap: 14px;
+  padding: 16px 20px;
   overflow-y: auto;
 }
 
 .nav-btn {
   width: 100%;
-  min-height: 42px;
+  min-height: 48px;
   display: grid;
-  grid-template-columns: auto 1fr;
+  grid-template-columns: 28px minmax(0, 1fr) auto;
   align-items: center;
   gap: 12px;
   padding: 0 12px;
   border: 1px solid transparent;
-  border-radius: 6px;
+  border-radius: 8px;
   background: transparent;
-  color: #475569;
+  color: #64748b;
   text-align: left;
-  transition: background 160ms var(--ease), color 160ms var(--ease);
+  transition:
+    background 180ms var(--ease),
+    border-color 180ms var(--ease),
+    color 180ms var(--ease),
+    box-shadow 180ms var(--ease);
+}
+
+.nav-btn:hover {
+  background: rgba(16,185,129,.07);
+  color: #0f9f78;
 }
 
-.nav-btn:hover,
 .nav-btn.active {
-  background: rgba(16,185,129,.10);
-  color: var(--primary);
+  background: linear-gradient(90deg, rgba(16,185,129,.16), rgba(16,185,129,.08));
+  border-color: rgba(16,185,129,.10);
+  color: #059669;
+  box-shadow: inset 3px 0 0 #10b981;
 }
 
 .nav-icon {
-  width: 20px;
-  height: 20px;
+  width: 28px;
+  height: 28px;
   display: grid;
   place-items: center;
+  border-radius: 7px;
+  color: currentColor;
 }
 
 .nav-btn :deep(svg) {
-  width: 16px;
-  height: 16px;
+  width: 19px;
+  height: 19px;
   stroke: currentColor;
   stroke-width: 2;
   fill: none;
@@ -174,43 +191,130 @@ const emit = defineEmits(['navigate', 'openChat'])
   stroke-linejoin: round;
 }
 
+.nav-label {
+  min-width: 0;
+  color: currentColor;
+  font-size: 14px;
+  font-weight: 750;
+  line-height: 1.2;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.nav-badge {
+  min-width: 34px;
+  height: 22px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0 8px;
+  border-radius: 999px;
+  background: #ff5b67;
+  color: #fff;
+  font-size: 12px;
+  font-weight: 800;
+  line-height: 1;
+}
+
 .rail-user {
-  padding: 16px;
-  border-top: 1px solid var(--line);
-  background: #fff;
+  min-width: 0;
+  min-height: 74px;
+  display: grid;
+  grid-template-columns: 38px minmax(0, 1fr) 22px;
+  align-items: center;
+  gap: 10px;
+  margin: 0;
+  padding: 16px 20px 18px;
+  border: 0;
+  border-top: 1px solid transparent;
+  background: transparent;
+  color: #64748b;
+  text-align: left;
+  transition: background 180ms var(--ease), border-color 180ms var(--ease);
+}
+
+.rail-user:hover {
+  border-top-color: #e2e8f0;
+  background: rgba(255,255,255,.72);
+}
+
+.user-avatar {
+  width: 36px;
+  height: 36px;
+  display: grid;
+  place-items: center;
+  border: 2px solid #fff;
+  border-radius: 999px;
+  background: linear-gradient(135deg, #0f9f78, #65d6b4);
+  box-shadow: 0 6px 14px rgba(15,159,120,.18);
+  color: #fff;
+  font-size: 14px;
+  font-weight: 800;
+}
+
+.user-copy {
+  min-width: 0;
+  display: grid;
+  gap: 2px;
+}
+
+.user-copy strong {
+  color: #334155;
+  font-size: 14px;
+  font-weight: 750;
+  line-height: 1.2;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.user-copy span {
+  color: #64748b;
+  font-size: 12px;
+  line-height: 1.2;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .rail-user .pi {
-  color: var(--muted);
+  justify-self: end;
+  color: #718096;
+  font-size: 13px;
 }
 
 @media (max-width: 980px) {
   .rail {
     position: relative;
     height: auto;
-    gap: 14px;
-  }
-
-  .rail-nav {
-    grid-auto-flow: row;
   }
 }
 
 @media (max-width: 760px) {
   .rail {
     border-right: 0;
-    border-bottom: 1px solid var(--line);
-    padding: 14px;
+    border-bottom: 1px solid #dbe4ee;
+  }
+
+  .rail-brand {
+    min-height: 68px;
+    padding: 16px;
   }
 
   .rail-nav {
     display: flex;
+    gap: 10px;
+    padding: 8px 16px 16px;
     overflow-x: auto;
-    padding-bottom: 2px;
   }
 
   .nav-btn {
-    min-width: 190px;
+    min-width: 148px;
+  }
+
+  .rail-user {
+    display: none;
   }
 }
 </style>
diff --git a/src/components/layout/TopBar.vue b/src/components/layout/TopBar.vue
index dbb9ef4..41f5a95 100644
--- a/src/components/layout/TopBar.vue
+++ b/src/components/layout/TopBar.vue
@@ -1,5 +1,5 @@
 <template>
-  <header class="topbar">
+  <header class="topbar" :class="{ 'chat-mode': isChat }">
     <div class="title-group">
       <div class="eyebrow">Smart Expense Operations</div>
       <h1>{{ currentView.title }}</h1>
@@ -7,24 +7,128 @@
     </div>
 
     <div class="top-actions">
-      <span class="search-wrap">
+      <span v-if="isChat || !isOverview" class="search-wrap" :class="{ wide: isChat }">
         <i class="pi pi-search search-icon"></i>
-        <input :value="search" type="search" :placeholder="isChat ? '搜索单号、申请人、目的地' : '搜索申请人、单号、费用类型'" @input="emit('update:search', $event.target.value)" />
+        <input
+          :value="search"
+          type="search"
+          :placeholder="isChat ? '搜索报销单、发票、单号、部门...' : '搜索申请人、单号、费用类型...'"
+          @input="emit('update:search', $event.target.value)"
+        />
       </span>
 
-      <div v-if="!isChat" class="date-chip">
-        <i class="pi pi-calendar"></i>
-        <span>2024-07-06 ~ 2024-07-12</span>
-      </div>
-
       <template v-if="isChat">
-        <button class="top-btn primary" type="button" @click="emit('newApplication')">
-          <i class="pi pi-plus"></i>
-          <span>新建出差申请</span>
+        <button class="icon-btn notification" type="button" aria-label="查看通知">
+          <i class="pi pi-bell"></i>
+          <span>1</span>
+        </button>
+        <button class="profile-btn" type="button" aria-label="打开用户菜单">
+          <span class="profile-avatar">张</span>
+          <span class="profile-copy">
+            <strong>张晓明</strong>
+            <small>财务管理员</small>
+          </span>
+          <i class="pi pi-angle-down"></i>
         </button>
       </template>
+
       <template v-else>
-        <button class="top-btn primary" type="button" @click="emit('openChat')">
+        <div v-if="isOverview" class="range-combo" aria-label="首页时间范围">
+          <div class="range-shell">
+            <span class="range-meta">
+              <i class="pi pi-calendar"></i>
+              <span>{{ activeDateLabel }}</span>
+            </span>
+
+            <div class="range-tabs" role="tablist" aria-label="时间范围">
+              <button
+                v-for="option in rangeOptions"
+                :key="option.value"
+                type="button"
+                role="tab"
+                :aria-selected="activeRange === option.value"
+                :class="{ active: activeRange === option.value }"
+                @click="setRange(option.value)"
+              >
+                {{ option.label }}
+              </button>
+            </div>
+          </div>
+
+          <div class="custom-range-wrap">
+            <button
+              class="custom-range-btn"
+              type="button"
+              :class="{ active: isCustomRange }"
+              :aria-expanded="calendarOpen"
+              aria-haspopup="dialog"
+              @click="calendarOpen = !calendarOpen"
+            >
+              <i class="pi pi-calendar-plus"></i>
+              <span>选择时间段</span>
+            </button>
+
+            <div v-if="calendarOpen" class="calendar-popover" role="dialog" aria-label="选择看板时间段">
+              <header>
+                <strong>选择看板时间段</strong>
+                <button type="button" aria-label="关闭日期选择" @click="calendarOpen = false">
+                  <i class="pi pi-times"></i>
+                </button>
+              </header>
+
+              <div class="date-fields">
+                <label>
+                  <span>开始日期</span>
+                  <input v-model="draftStart" type="date" />
+                </label>
+                <label>
+                  <span>结束日期</span>
+                  <input v-model="draftEnd" type="date" />
+                </label>
+              </div>
+
+              <div class="quick-presets" aria-label="快捷时间段">
+                <button type="button" @click="applyDraft('2024-07-12', '2024-07-12')">今日</button>
+                <button type="button" @click="applyDraft('2024-07-06', '2024-07-12')">本周</button>
+                <button type="button" @click="applyDraft('2024-07-01', '2024-07-31')">本月</button>
+              </div>
+
+              <footer>
+                <button class="ghost-btn" type="button" @click="calendarOpen = false">取消</button>
+                <button class="apply-btn" type="button" :disabled="!canApplyCustomRange" @click="applyCustomRange">
+                  应用
+                </button>
+              </footer>
+            </div>
+          </div>
+        </div>
+
+        <template v-else-if="isRequests">
+          <button class="month-chip" type="button" aria-label="选择报销月份">
+            <i class="pi pi-calendar"></i>
+            <span>2024-07</span>
+            <i class="pi pi-angle-down"></i>
+          </button>
+          <button class="icon-btn notification" type="button" aria-label="查看通知">
+            <i class="pi pi-bell"></i>
+            <span>3</span>
+          </button>
+          <button class="profile-btn" type="button" aria-label="打开用户菜单">
+            <span class="profile-avatar">张</span>
+            <span class="profile-copy">
+              <strong>张晓明</strong>
+              <small>财务管理员</small>
+            </span>
+            <i class="pi pi-angle-down"></i>
+          </button>
+        </template>
+
+        <div v-else class="date-chip">
+          <i class="pi pi-calendar"></i>
+          <span>2024-07-06 ~ 2024-07-12</span>
+        </div>
+
+        <button v-if="!isRequests" class="top-btn primary" type="button" @click="emit('openChat')">
           <i class="pi pi-sparkles"></i>
           <span>AI 助手</span>
         </button>
@@ -34,46 +138,151 @@
 </template>
 
 <script setup>
-import { computed } from 'vue'
+import { computed, ref, watch } from 'vue'
 
 const props = defineProps({
   currentView: { type: Object, required: true },
   search: { type: String, default: '' },
-  activeView: { type: String, default: '' }
+  activeView: { type: String, default: '' },
+  ranges: { type: Array, default: () => [] },
+  activeRange: { type: String, default: '' },
+  customRange: {
+    type: Object,
+    default: () => ({ start: '2024-07-06', end: '2024-07-12' })
+  }
 })
 
-const emit = defineEmits(['update:search', 'batchApprove', 'openChat', 'newApplication'])
+const emit = defineEmits([
+  'update:search',
+  'update:activeRange',
+  'update:customRange',
+  'batchApprove',
+  'openChat',
+  'newApplication'
+])
 
 const isChat = computed(() => props.activeView === 'chat')
+const isOverview = computed(() => props.activeView === 'overview')
+const isRequests = computed(() => props.activeView === 'requests')
+const calendarOpen = ref(false)
+const draftStart = ref(props.customRange.start)
+const draftEnd = ref(props.customRange.end)
+
+const fallbackRangeLabels = ['今日', '本周', '本月']
+const dateLabels = {
+  '今日': '2024-07-12',
+  '本周': '2024-07-06 ~ 2024-07-12',
+  '本月': '2024-07'
+}
+
+const rangeOptions = computed(() =>
+  props.ranges.map((range, index) => ({
+    value: range,
+    label: fallbackRangeLabels[index] ?? String(range)
+  }))
+)
+
+const activeOption = computed(() =>
+  rangeOptions.value.find((option) => option.value === props.activeRange) ?? rangeOptions.value[0]
+)
+
+const isCustomRange = computed(() => props.activeRange === 'custom')
+
+const activeDateLabel = computed(() => {
+  if (isCustomRange.value) return formatRangeLabel(props.customRange.start, props.customRange.end)
+  return dateLabels[activeOption.value?.label] ?? '2024-07-06 ~ 2024-07-12'
+})
+
+const canApplyCustomRange = computed(() =>
+  Boolean(draftStart.value && draftEnd.value && draftStart.value <= draftEnd.value)
+)
+
+watch(
+  () => props.customRange,
+  (range) => {
+    draftStart.value = range.start
+    draftEnd.value = range.end
+  },
+  { deep: true }
+)
+
+function setRange(range) {
+  emit('update:activeRange', range)
+  calendarOpen.value = false
+}
+
+function applyDraft(start, end) {
+  draftStart.value = start
+  draftEnd.value = end
+}
+
+function applyCustomRange() {
+  if (!canApplyCustomRange.value) return
+  emit('update:customRange', { start: draftStart.value, end: draftEnd.value })
+  emit('update:activeRange', 'custom')
+  calendarOpen.value = false
+}
+
+function formatRangeLabel(start, end) {
+  if (!start || !end) return '选择时间段'
+  if (start === end) return start
+  return `${start} ~ ${end}`
+}
 </script>
 
 <style scoped>
 .topbar {
   display: flex;
-  align-items: flex-start;
+  align-items: center;
   justify-content: space-between;
   gap: 24px;
-  padding: 16px;
+  padding: 18px 24px 20px;
   background: #fff;
 }
 
+.topbar.chat-mode {
+  padding-bottom: 16px;
+  border-bottom: 1px solid #eef2f7;
+}
+
 .title-group {
   min-width: 0;
 }
 
+.eyebrow {
+  display: inline-block;
+  margin-bottom: 8px;
+  padding: 3px 10px;
+  border-radius: 6px;
+  background: linear-gradient(135deg, rgba(16, 185, 129, 0.10), rgba(59, 130, 246, 0.10));
+  color: #0d9668;
+  font-size: 11px;
+  font-weight: 800;
+  letter-spacing: 1.2px;
+  text-transform: uppercase;
+}
+
+.topbar h1 {
+  color: #0f172a;
+  font-size: 26px;
+  font-weight: 800;
+  letter-spacing: 0;
+  line-height: 1.2;
+}
+
 .topbar p {
-  margin-top: 4px;
+  margin-top: 6px;
   max-width: 720px;
-  color: var(--muted);
+  color: #64748b;
   font-size: 14px;
-  line-height: 1.45;
+  line-height: 1.5;
 }
 
 .top-actions {
   display: flex;
   align-items: center;
   justify-content: flex-end;
-  gap: 16px;
+  gap: 14px;
   flex-wrap: wrap;
 }
 
@@ -82,31 +291,277 @@ const isChat = computed(() => props.activeView === 'chat')
   width: 256px;
 }
 
+.search-wrap.wide {
+  width: min(340px, 28vw);
+}
+
 .search-icon {
   position: absolute;
-  left: 13px;
+  left: 14px;
   top: 50%;
   transform: translateY(-50%);
-  color: var(--muted);
-  font-size: 14px;
+  color: #64748b;
+  font-size: 15px;
 }
 
 .search-wrap input {
   width: 100%;
-  height: 40px;
-  padding: 0 14px 0 38px;
-  border: 1px solid #cbd5e1;
-  border-radius: 6px;
+  height: 42px;
+  padding: 0 14px 0 40px;
+  border: 1px solid #d7e0ea;
+  border-radius: 8px;
+  background: #fff;
+  color: #0f172a;
   font-size: 14px;
   transition: border-color 160ms ease, box-shadow 160ms ease;
 }
 
+.search-wrap input::placeholder {
+  color: #8da0b4;
+}
+
 .search-wrap input:focus {
   border-color: #10b981;
-  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.16);
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.14);
   outline: none;
 }
 
+.range-combo {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.range-shell {
+  height: 42px;
+  display: inline-flex;
+  align-items: center;
+  padding: 3px;
+  border: 1px solid #d7e0ea;
+  border-radius: 10px;
+  background: #fff;
+  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
+}
+
+.range-meta {
+  height: 34px;
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  padding: 0 12px;
+  border-right: 1px solid #e2e8f0;
+  color: #334155;
+  font-size: 13px;
+  font-weight: 650;
+  white-space: nowrap;
+}
+
+.range-meta .pi {
+  color: #10b981;
+}
+
+.range-tabs {
+  display: inline-flex;
+  align-items: center;
+  gap: 2px;
+  padding-left: 3px;
+}
+
+.range-tabs button {
+  height: 34px;
+  min-width: 54px;
+  padding: 0 14px;
+  border: 0;
+  border-radius: 8px;
+  background: transparent;
+  color: #64748b;
+  font-size: 13px;
+  font-weight: 700;
+  white-space: nowrap;
+  transition: background 160ms ease, color 160ms ease, box-shadow 160ms ease;
+}
+
+.range-tabs button:hover:not(.active) {
+  background: #f1f5f9;
+  color: #334155;
+}
+
+.range-tabs button.active {
+  background: #10b981;
+  color: #fff;
+  box-shadow: 0 6px 14px rgba(16, 185, 129, .18);
+}
+
+.custom-range-wrap {
+  position: relative;
+}
+
+.custom-range-btn {
+  height: 42px;
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  padding: 0 13px;
+  border: 1px solid #d7e0ea;
+  border-radius: 10px;
+  background: #fff;
+  color: #334155;
+  font-size: 13px;
+  font-weight: 750;
+  white-space: nowrap;
+  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, box-shadow 160ms ease;
+}
+
+.custom-range-btn:hover,
+.custom-range-btn.active {
+  border-color: rgba(16, 185, 129, .34);
+  background: #f6fffb;
+  color: #0f9f78;
+}
+
+.custom-range-btn.active {
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, .10);
+}
+
+.calendar-popover {
+  position: absolute;
+  top: calc(100% + 10px);
+  right: 0;
+  width: 336px;
+  z-index: 40;
+  display: grid;
+  gap: 14px;
+  padding: 16px;
+  border: 1px solid #d7e0ea;
+  border-radius: 12px;
+  background: #fff;
+  box-shadow: 0 18px 42px rgba(15, 23, 42, .16);
+}
+
+.calendar-popover::before {
+  content: "";
+  position: absolute;
+  top: -6px;
+  right: 30px;
+  width: 12px;
+  height: 12px;
+  border-top: 1px solid #d7e0ea;
+  border-left: 1px solid #d7e0ea;
+  background: #fff;
+  transform: rotate(45deg);
+}
+
+.calendar-popover header,
+.calendar-popover footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.calendar-popover header strong {
+  color: #0f172a;
+  font-size: 15px;
+}
+
+.calendar-popover header button {
+  width: 30px;
+  height: 30px;
+  display: grid;
+  place-items: center;
+  border: 0;
+  border-radius: 8px;
+  background: transparent;
+  color: #64748b;
+}
+
+.calendar-popover header button:hover {
+  background: #f1f5f9;
+  color: #0f172a;
+}
+
+.date-fields {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 10px;
+}
+
+.date-fields label {
+  display: grid;
+  gap: 6px;
+}
+
+.date-fields span {
+  color: #64748b;
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.date-fields input {
+  width: 100%;
+  height: 38px;
+  padding: 0 9px;
+  border: 1px solid #d7e0ea;
+  border-radius: 8px;
+  color: #0f172a;
+  font-size: 13px;
+}
+
+.date-fields input:focus {
+  border-color: #10b981;
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, .12);
+  outline: none;
+}
+
+.quick-presets {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 8px;
+}
+
+.quick-presets button {
+  height: 34px;
+  border: 1px solid #e2e8f0;
+  border-radius: 8px;
+  background: #f8fafc;
+  color: #334155;
+  font-size: 13px;
+  font-weight: 700;
+}
+
+.quick-presets button:hover {
+  border-color: rgba(16, 185, 129, .28);
+  background: #ecfdf5;
+  color: #0f9f78;
+}
+
+.ghost-btn,
+.apply-btn {
+  height: 36px;
+  padding: 0 14px;
+  border-radius: 8px;
+  font-size: 13px;
+  font-weight: 750;
+}
+
+.ghost-btn {
+  border: 1px solid #d7e0ea;
+  background: #fff;
+  color: #334155;
+}
+
+.apply-btn {
+  border: 0;
+  background: #10b981;
+  color: #fff;
+}
+
+.apply-btn:disabled {
+  cursor: not-allowed;
+  background: #cbd5e1;
+}
+
 .date-chip {
   height: 40px;
   display: inline-flex;
@@ -121,6 +576,29 @@ const isChat = computed(() => props.activeView === 'chat')
   font-weight: 400;
 }
 
+.month-chip {
+  height: 42px;
+  display: inline-flex;
+  align-items: center;
+  gap: 9px;
+  padding: 0 14px;
+  border: 1px solid #d7e0ea;
+  border-radius: 8px;
+  background: #fff;
+  color: #334155;
+  font-size: 14px;
+  font-weight: 750;
+}
+
+.month-chip .pi:first-child {
+  color: #64748b;
+}
+
+.month-chip:hover {
+  border-color: rgba(16, 185, 129, .32);
+  color: #0f9f78;
+}
+
 .date-chip .pi {
   color: #94a3b8;
 }
@@ -134,7 +612,7 @@ const isChat = computed(() => props.activeView === 'chat')
   border: 0;
   border-radius: 6px;
   font-size: 14px;
-  font-weight: 500;
+  font-weight: 650;
   transition: background 160ms ease;
 }
 
@@ -147,17 +625,174 @@ const isChat = computed(() => props.activeView === 'chat')
   background: #0ea672;
 }
 
-@media (max-width: 760px) {
+.icon-btn,
+.profile-btn {
+  border: 0;
+  background: transparent;
+}
+
+.icon-btn {
+  position: relative;
+  width: 42px;
+  height: 42px;
+  display: grid;
+  place-items: center;
+  border-radius: 999px;
+  color: #334155;
+  font-size: 20px;
+}
+
+.icon-btn:hover,
+.profile-btn:hover {
+  background: #f3f7fa;
+}
+
+.notification span {
+  position: absolute;
+  top: 4px;
+  right: 5px;
+  min-width: 18px;
+  height: 18px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: 2px solid #fff;
+  border-radius: 999px;
+  background: #ff3b45;
+  color: #fff;
+  font-size: 11px;
+  font-weight: 800;
+  line-height: 1;
+}
+
+.profile-btn {
+  min-height: 46px;
+  display: inline-grid;
+  grid-template-columns: 38px minmax(0, 1fr) 18px;
+  align-items: center;
+  gap: 10px;
+  padding: 4px 6px;
+  border-radius: 10px;
+  color: #334155;
+  text-align: left;
+}
+
+.profile-avatar {
+  width: 38px;
+  height: 38px;
+  display: grid;
+  place-items: center;
+  border-radius: 999px;
+  background: linear-gradient(135deg, #203047, #60758a);
+  color: #fff;
+  font-size: 14px;
+  font-weight: 800;
+}
+
+.profile-copy {
+  display: grid;
+  gap: 2px;
+}
+
+.profile-copy strong {
+  color: #172033;
+  font-size: 14px;
+  font-weight: 800;
+}
+
+.profile-copy small {
+  color: #64748b;
+  font-size: 12px;
+}
+
+.profile-btn .pi {
+  color: #64748b;
+}
+
+@media (max-width: 1120px) {
+  .range-combo {
+    width: 100%;
+    justify-content: flex-end;
+  }
+}
+
+@media (max-width: 960px) {
   .topbar {
     flex-direction: column;
     align-items: stretch;
-    padding: 18px 16px;
   }
 
   .top-actions,
   .search-wrap,
-  .date-chip {
+  .search-wrap.wide,
+  .date-chip,
+  .month-chip,
+  .top-btn {
     width: 100%;
   }
+
+  .range-combo {
+    justify-content: stretch;
+  }
+
+  .range-shell {
+    flex: 1;
+  }
+
+  .range-meta {
+    flex: 1;
+  }
+
+  .custom-range-btn {
+    width: 100%;
+    justify-content: center;
+  }
+
+  .calendar-popover {
+    right: auto;
+    left: 0;
+  }
+
+  .profile-btn {
+    justify-content: start;
+  }
+}
+
+@media (max-width: 640px) {
+  .range-combo {
+    display: grid;
+    gap: 8px;
+  }
+
+  .range-shell {
+    height: auto;
+    display: grid;
+    gap: 4px;
+  }
+
+  .range-meta {
+    width: 100%;
+    border-right: 0;
+    border-bottom: 1px solid #e2e8f0;
+    justify-content: center;
+  }
+
+  .range-tabs {
+    width: 100%;
+    padding-left: 0;
+  }
+
+  .range-tabs button {
+    flex: 1;
+    padding: 0 8px;
+  }
+
+  .calendar-popover {
+    width: min(336px, calc(100vw - 32px));
+  }
+
+  .date-fields {
+    grid-template-columns: 1fr;
+  }
 }
 </style>
diff --git a/src/composables/useNavigation.js b/src/composables/useNavigation.js
index 1d6148b..74d7528 100644
--- a/src/composables/useNavigation.js
+++ b/src/composables/useNavigation.js
@@ -11,20 +11,20 @@ export const navItems = [
     desc: '面向财务共享中心的审批、风控、SLA与自动化运营看板'
   },
   {
-    id: 'chat',
-    label: '审批中心',
-    navHint: 'AI 助手与单据处理',
-    icon: icons.message,
-    title: '单据管理中心',
-    desc: '管理出差申请、报销单据，AI 辅助发起申请与智能审核。'
+    id: 'requests',
+    label: '差旅申请/报销',
+    navHint: '差旅单据与发起申请',
+    icon: icons.list,
+    title: '差旅申请/报销',
+    desc: '查看员工差旅报销单据、跟踪进度、发起新申请'
   },
   {
-    id: 'requests',
-    label: '报销单',
-    navHint: '待审队列与风险处理',
-    icon: icons.list,
-    title: '报销申请队列',
-    desc: '按风险、补件状态和 AI 建议处理待审单据。'
+    id: 'chat',
+    label: 'AI助手',
+    navHint: '指标、趋势与行动建议',
+    icon: icons.message,
+    title: 'AI 财务助手',
+    desc: '问指标、看趋势、拿建议，辅助你处理当前报销运营工作'
   },
   {
     id: 'policies',
diff --git a/src/composables/useRequests.js b/src/composables/useRequests.js
index 7219069..23e2b93 100644
--- a/src/composables/useRequests.js
+++ b/src/composables/useRequests.js
@@ -23,9 +23,10 @@ export function useRequests() {
         || (filters.risk === '高风险' && item.status === 'danger')
         || (filters.risk === '需解释' && item.status === 'warning')
         || (filters.risk === '低风险' && item.status === 'success')
-      const matchesRange = activeRange.value === '本月'
-        || (activeRange.value === '本周' && item.range !== '本月')
-        || (activeRange.value === '今日' && item.range === '今日')
+  const matchesRange = activeRange.value === 'custom'
+    || activeRange.value === '本月'
+    || (activeRange.value === '本周' && item.range !== '本月')
+    || (activeRange.value === '今日' && item.range === '今日')
       return matchesSearch && matchesEntity && matchesCategory && matchesRisk && matchesRange
     })
   })