diff --git a/frontend/analysis.html b/frontend/analysis.html
index ad6f725..281c0d9 100644
--- a/frontend/analysis.html
+++ b/frontend/analysis.html
@@ -11,30 +11,28 @@
 *{margin:0;padding:0;box-sizing:border-box}
 body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;font-size:14px}
 .header{background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:40}
-.header-inner{max-width:1400px;margin:0 auto;padding:0 24px;height:56px;display:flex;align-items:center;gap:16px}
-.header-left{display:flex;align-items:center;gap:8px;flex-shrink:0}
-.header-logo{width:28px;height:28px;background:linear-gradient(135deg,#0071e3,#5ac8fa);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:700}
-.header h1{font-size:16px;font-weight:600;color:var(--text);letter-spacing:-.2px;white-space:nowrap;margin:0}
-.nav-tabs{display:flex;gap:2px;background:rgba(0,0,0,.04);border-radius:var(--radius-xs);padding:3px;flex-shrink:0}
-.nav-tab{padding:7px 20px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text2);text-decoration:none;transition:all .2s;cursor:pointer;white-space:nowrap}
-.nav-tab:hover{color:var(--text);background:rgba(255,255,255,.5)}
-.nav-tab.active{background:#fff;color:var(--text);box-shadow:0 1px 4px rgba(0,0,0,.08)}
-.header-right a,.hdr-btn{color:var(--text2);text-decoration:none;font-size:12px;padding:6px 14px;border-radius:var(--radius-xs);transition:all .2s;background:transparent;border:none;cursor:pointer;font-family:inherit}
+.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:52px;display:flex;align-items:center;justify-content:space-between}
+.header h1{font-size:17px;font-weight:600;color:var(--text);letter-spacing:-.2px}
+.nav-tabs{display:flex;gap:4px;background:rgba(0,0,0,.04);border-radius:var(--radius-xs);padding:3px}
+.nav-tab{padding:6px 16px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text2);text-decoration:none;transition:all .2s}
+.nav-tab:hover{color:var(--text)}
+.nav-tab.active{background:#fff;color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08)}
+.header-right{display:flex;align-items:center;gap:4px}
+.header-right a,.hdr-btn{color:var(--text2);text-decoration:none;font-size:12px;padding:6px 12px;border-radius:var(--radius-xs);transition:all .2s;background:transparent;border:none;cursor:pointer;font-family:inherit}
 .header-right a:hover,.hdr-btn:hover{background:rgba(0,0,0,.04);color:var(--text)}
-.header-right .admin-link{color:var(--blue);font-weight:500}
+.header-right .admin-link{color:var(--blue)}
 .header-right .logout-link{color:var(--red)}
-.user-info{color:var(--text);font-size:13px;font-weight:500;cursor:pointer;padding:6px 14px;border-radius:var(--radius-xs);transition:all .2s;background:rgba(0,0,0,.02)}
-.user-info:hover{background:rgba(0,0,0,.06)}
+.user-info{color:var(--text);font-size:13px;font-weight:500;cursor:pointer;padding:6px 12px;border-radius:var(--radius-xs);transition:all .2s}
+.user-info:hover{background:rgba(0,0,0,.04)}
 .notif-wrap{position:relative}
-.notif-bell{cursor:pointer;padding:6px 8px;border-radius:var(--radius-xs);transition:all .2s;color:var(--text2)}
+.notif-bell{cursor:pointer;padding:4px 8px;border-radius:var(--radius-xs);transition:all .2s;color:var(--text2)}
 .notif-bell:hover{background:rgba(0,0,0,.04);color:var(--text)}
-.notif-badge{position:absolute;top:2px;right:2px;min-width:16px;height:16px;background:var(--red);color:#fff;border-radius:8px;font-size:10px;font-weight:600;display:flex;align-items:center;justify-content:center;padding:0 4px}
+.notif-badge{position:absolute;top:2px;right:2px;min-width:14px;height:14px;background:var(--red);color:#fff;border-radius:7px;font-size:9px;font-weight:600;display:flex;align-items:center;justify-content:center;padding:0 3px}
 .notif-dropdown{display:none;position:absolute;right:0;top:calc(100% + 8px);background:rgba(255,255,255,.96);backdrop-filter:blur(24px);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 48px rgba(0,0,0,.15);width:360px;max-height:480px;overflow:hidden;z-index:60}
 .notif-dropdown.show{display:block}
 .notif-header{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
 .notif-header h4{font-size:14px;font-weight:600;color:var(--text)}
 .notif-header .mark-all{font-size:12px;color:var(--blue);cursor:pointer;background:none;border:none;font-family:inherit}
-.notif-header .mark-all:hover{text-decoration:underline}
 .notif-list{overflow-y:auto;max-height:380px}
 .notif-item{padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s;display:flex;gap:12px;align-items:flex-start}
 .notif-item:hover{background:rgba(0,0,0,.02)}
@@ -74,19 +72,17 @@ body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC"
 <body>
 <div class="header">
   <div class="header-inner">
-    <div class="header-left">
-      <div class="header-logo">D</div>
-      <h1>债务管理</h1>
-    </div>
-    <div class="nav-tabs">
-      <a href="/" class="nav-tab">首页</a>
-      <a href="/analysis.html" class="nav-tab active">分析</a>
+    <div style="display:flex;align-items:center;gap:16px">
+      <h1>债务统计</h1>
+      <div class="nav-tabs">
+        <a href="/" class="nav-tab">首页</a>
+        <a href="/analysis.html" class="nav-tab active">分析</a>
+      </div>
     </div>
     <div class="header-right">
-      <span class="user-info" id="userInfo"></span>
-      <div class="notif-wrap" style="position:relative">
+      <div class="notif-wrap">
         <div class="notif-bell" onclick="toggleNotifDropdown(event)">
-          <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor"><path d="M12 22c1.1 0 2-.9 2-2h-4c0 1.1.9 2 2 2zm6-6v-5c0-3.07-1.63-5.64-4.5-6.32V4c0-.83-.67-1.5-1.5-1.5s-1.5.67-1.5 1.5v.68C7.64 5.36 6 7.92 6 11v5l-2 2v1h16v-1l-2-2z"/></svg>
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><path d="M12 22c1.1 0 2-.9 2-2h-4c0 1.1.9 2 2 2zm6-6v-5c0-3.07-1.63-5.64-4.5-6.32V4c0-.83-.67-1.5-1.5-1.5s-1.5.67-1.5 1.5v.68C7.64 5.36 6 7.92 6 11v5l-2 2v1h16v-1l-2-2z"/></svg>
           <span class="notif-badge" id="notifBadge" style="display:none">0</span>
         </div>
         <div class="notif-dropdown" id="notifDropdown">
@@ -94,6 +90,28 @@ body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC"
           <div class="notif-list" id="notifList"><div class="notif-empty">暂无通知</div></div>
         </div>
       </div>
+      <span class="user-info" id="userInfo"></span>
+      <a href="/admin.html" class="admin-link" id="adminLink" style="display:none">管理</a>
+      <div class="export-wrap">
+        <button class="hdr-btn" onclick="toggleExport(event)">导出</button>
+        <div class="export-menu" id="exportMenu">
+          <a href="#" onclick="exportCSV(event)">导出 CSV</a>
+          <a href="#" onclick="exportJSON(event)">导出 JSON</a>
+          <a href="#" onclick="exportHTML(event)">导出 HTML</a>
+        </div>
+      </div>
+      <div class="export-wrap">
+        <button class="hdr-btn" onclick="toggleImport(event)">导入</button>
+        <div class="export-menu" id="importMenu">
+          <a href="#" onclick="downloadTemplate(event)">下载模板</a>
+          <a href="#" onclick="showImportModal(event)">导入 CSV</a>
+        </div>
+      </div>
+      <a href="#" class="logout-link" onclick="doLogout()">退出</a>
+    </div>
+  </div>
+</div>
+      </div>
       <div class="export-wrap">
         <button class="hdr-btn" onclick="toggleExport(event)">导出</button>
         <div class="export-menu" id="exportMenu">
diff --git a/frontend/index.html b/frontend/index.html
index ff9da6d..b63414f 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -28,30 +28,28 @@ body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text"
 
 /* HEADER */
 .header{background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:40}
-.header-inner{max-width:1400px;margin:0 auto;padding:0 24px;height:56px;display:flex;align-items:center;gap:16px}
-.header-left{display:flex;align-items:center;gap:8px;flex-shrink:0}
-.header-logo{width:28px;height:28px;background:linear-gradient(135deg,#0071e3,#5ac8fa);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:700}
-.header h1{font-size:16px;font-weight:600;color:var(--text);letter-spacing:-.2px;white-space:nowrap;margin:0}
-.nav-tabs{display:flex;gap:2px;background:rgba(0,0,0,.04);border-radius:var(--radius-xs);padding:3px;flex-shrink:0}
-.nav-tab{padding:7px 20px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text2);text-decoration:none;transition:all .2s;cursor:pointer;white-space:nowrap}
-.nav-tab:hover{color:var(--text);background:rgba(255,255,255,.5)}
-.nav-tab.active{background:#fff;color:var(--text);box-shadow:0 1px 4px rgba(0,0,0,.08)}
-.header-right a,.hdr-btn{color:var(--text2);text-decoration:none;font-size:12px;padding:6px 14px;border-radius:var(--radius-xs);transition:all .2s;background:transparent;border:none;cursor:pointer;font-family:inherit}
+.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:52px;display:flex;align-items:center;justify-content:space-between}
+.header h1{font-size:17px;font-weight:600;color:var(--text);letter-spacing:-.2px}
+.nav-tabs{display:flex;gap:4px;background:rgba(0,0,0,.04);border-radius:var(--radius-xs);padding:3px}
+.nav-tab{padding:6px 16px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text2);text-decoration:none;transition:all .2s}
+.nav-tab:hover{color:var(--text)}
+.nav-tab.active{background:#fff;color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08)}
+.header-right{display:flex;align-items:center;gap:4px}
+.header-right a,.hdr-btn{color:var(--text2);text-decoration:none;font-size:12px;padding:6px 12px;border-radius:var(--radius-xs);transition:all .2s;background:transparent;border:none;cursor:pointer;font-family:inherit}
 .header-right a:hover,.hdr-btn:hover{background:rgba(0,0,0,.04);color:var(--text)}
-.header-right .admin-link{color:var(--blue);font-weight:500}
+.header-right .admin-link{color:var(--blue)}
 .header-right .logout-link{color:var(--red)}
-.user-info{color:var(--text);font-size:13px;font-weight:500;cursor:pointer;padding:6px 14px;border-radius:var(--radius-xs);transition:all .2s;background:rgba(0,0,0,.02)}
-.user-info:hover{background:rgba(0,0,0,.06)}
+.user-info{color:var(--text);font-size:13px;font-weight:500;cursor:pointer;padding:6px 12px;border-radius:var(--radius-xs);transition:all .2s}
+.user-info:hover{background:rgba(0,0,0,.04)}
 .notif-wrap{position:relative}
-.notif-bell{cursor:pointer;padding:6px 8px;border-radius:var(--radius-xs);transition:all .2s;color:var(--text2)}
+.notif-bell{cursor:pointer;padding:4px 8px;border-radius:var(--radius-xs);transition:all .2s;color:var(--text2)}
 .notif-bell:hover{background:rgba(0,0,0,.04);color:var(--text)}
-.notif-badge{position:absolute;top:2px;right:2px;min-width:16px;height:16px;background:var(--red);color:#fff;border-radius:8px;font-size:10px;font-weight:600;display:flex;align-items:center;justify-content:center;padding:0 4px}
+.notif-badge{position:absolute;top:2px;right:2px;min-width:14px;height:14px;background:var(--red);color:#fff;border-radius:7px;font-size:9px;font-weight:600;display:flex;align-items:center;justify-content:center;padding:0 3px}
 .notif-dropdown{display:none;position:absolute;right:0;top:calc(100% + 8px);background:rgba(255,255,255,.96);backdrop-filter:blur(24px);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 48px rgba(0,0,0,.15);width:360px;max-height:480px;overflow:hidden;z-index:60}
 .notif-dropdown.show{display:block}
 .notif-header{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
 .notif-header h4{font-size:14px;font-weight:600;color:var(--text)}
 .notif-header .mark-all{font-size:12px;color:var(--blue);cursor:pointer;background:none;border:none;font-family:inherit}
-.notif-header .mark-all:hover{text-decoration:underline}
 .notif-list{overflow-y:auto;max-height:380px}
 .notif-item{padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s;display:flex;gap:12px;align-items:flex-start}
 .notif-item:hover{background:rgba(0,0,0,.02)}
@@ -357,19 +355,17 @@ body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text"
 <div id="appPage">
 <div class="header">
   <div class="header-inner">
-    <div class="header-left">
-      <div class="header-logo">D</div>
-      <h1>债务管理</h1>
-    </div>
-    <div class="nav-tabs">
-      <a href="/" class="nav-tab active">首页</a>
-      <a href="/analysis.html" class="nav-tab">分析</a>
+    <div style="display:flex;align-items:center;gap:16px">
+      <h1>债务统计</h1>
+      <div class="nav-tabs">
+        <a href="/" class="nav-tab active">首页</a>
+        <a href="/analysis.html" class="nav-tab">分析</a>
+      </div>
     </div>
     <div class="header-right">
-      <span class="user-info" id="userInfo"></span>
-      <div class="notif-wrap" style="position:relative">
+      <div class="notif-wrap">
         <div class="notif-bell" onclick="toggleNotifDropdown(event)">
-          <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor"><path d="M12 22c1.1 0 2-.9 2-2h-4c0 1.1.9 2 2 2zm6-6v-5c0-3.07-1.63-5.64-4.5-6.32V4c0-.83-.67-1.5-1.5-1.5s-1.5.67-1.5 1.5v.68C7.64 5.36 6 7.92 6 11v5l-2 2v1h16v-1l-2-2z"/></svg>
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><path d="M12 22c1.1 0 2-.9 2-2h-4c0 1.1.9 2 2 2zm6-6v-5c0-3.07-1.63-5.64-4.5-6.32V4c0-.83-.67-1.5-1.5-1.5s-1.5.67-1.5 1.5v.68C7.64 5.36 6 7.92 6 11v5l-2 2v1h16v-1l-2-2z"/></svg>
           <span class="notif-badge" id="notifBadge" style="display:none">0</span>
         </div>
         <div class="notif-dropdown" id="notifDropdown">
@@ -377,6 +373,28 @@ body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text"
           <div class="notif-list" id="notifList"><div class="notif-empty">暂无通知</div></div>
         </div>
       </div>
+      <span class="user-info" id="userInfo"></span>
+      <a href="/admin.html" class="admin-link" id="adminLink" style="display:none">管理</a>
+      <div class="export-wrap">
+        <button class="hdr-btn" onclick="toggleExport(event)">导出</button>
+        <div class="export-menu" id="exportMenu">
+          <a href="#" onclick="exportCSV(event)">导出 CSV</a>
+          <a href="#" onclick="exportJSON(event)">导出 JSON</a>
+          <a href="#" onclick="exportHTML(event)">导出 HTML</a>
+        </div>
+      </div>
+      <div class="export-wrap">
+        <button class="hdr-btn" onclick="toggleImport(event)">导入</button>
+        <div class="export-menu" id="importMenu">
+          <a href="#" onclick="downloadTemplate(event)">下载模板</a>
+          <a href="#" onclick="showImportModal(event)">导入 CSV</a>
+        </div>
+      </div>
+      <a href="#" class="logout-link" onclick="doLogout()">退出</a>
+    </div>
+  </div>
+</div>
+      </div>
       <div class="export-wrap">
         <button class="hdr-btn" onclick="toggleExport(event)">导出</button>
         <div class="export-menu" id="exportMenu">