diff --git a/memory/2026-04-12.md b/memory/2026-04-12.md
index 46b819c..df5e2e5 100644
--- a/memory/2026-04-12.md
+++ b/memory/2026-04-12.md
@@ -168,3 +168,28 @@
   - 展开结果确认：
     - `db.ports.published` 为 `5433`。
     - `db.image` 为 `docker.m.daocloud.io/pgvector/pgvector:pg16`。
+
+## 追加优化（后台页面左右留白收敛）
+
+- 背景：
+  - 用户反馈后台页面左右两侧 margin 偏大，宽屏下可用内容空间浪费。
+- 处理：
+  - `web/src/app/admin/layout.tsx` 将主容器最大宽度由 `max-w-[1360px]` 提升到 `max-w-[1760px]`。
+  - 同时增加轻量响应式外层横向内边距（`px-3 sm:px-4 xl:px-6`），避免贴边。
+  - 主内容区内边距从 `p-6 md:p-8` 收敛为 `p-4 md:p-6`，进一步释放表格可视宽度。
+- 验证：
+  - `cd web && npx eslint src/app/admin/layout.tsx` 通过。
+
+## 追加修复（Web 镜像构建 TypeScript 阻塞）
+
+- 触发问题：
+  - `docker compose build web` 在 `web/Dockerfile` 的 `RUN npm run build` 失败。
+  - 报错定位在 `web/src/app/page.tsx:190` 附近（`placeholder="Email"` 上下文），实际错误为 `Cannot find name 'title'`。
+- 根因：
+  - 登录/注册表单标题渲染使用了未定义变量 `title`，导致 TypeScript 检查失败并中断 Next.js 构建。
+- 处理：
+  - `web/src/app/page.tsx` 将 `{title}` 改为基于 `mode` 的内联表达式：
+    - 登录显示 `登录`
+    - 注册显示 `注册`
+- 验证：
+  - 复跑 `docker compose build web`，构建成功，路由静态生成完成，最终输出 `fquiz-web  Built`。
diff --git a/web/src/app/admin/layout.tsx b/web/src/app/admin/layout.tsx
index 682dd93..25adb92 100644
--- a/web/src/app/admin/layout.tsx
+++ b/web/src/app/admin/layout.tsx
@@ -91,7 +91,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
         <div className="absolute right-[-6rem] top-20 h-96 w-96 rounded-full bg-sky-300/30 blur-3xl" />
       </div>
 
-      <div className="relative mx-auto grid min-h-screen w-full max-w-[1360px] grid-cols-1 gap-0 md:grid-cols-[280px_minmax(0,1fr)]">
+      <div className="relative mx-auto grid min-h-screen w-full max-w-[1760px] grid-cols-1 gap-0 px-3 sm:px-4 xl:px-6 md:grid-cols-[280px_minmax(0,1fr)]">
         <aside className="border-r border-[var(--border)] bg-white/70 p-6 backdrop-blur-xl md:sticky md:top-0 md:h-screen md:overflow-y-auto">
           <div className="mb-8">
             <Link href="/" className="text-xl font-bold tracking-tight text-slate-900">fquiz admin</Link>
@@ -140,7 +140,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
           </div>
         </aside>
 
-        <main className="p-6 md:p-8">
+        <main className="p-4 md:p-6">
           <div className="surface-card mb-6 flex items-center justify-between gap-4 bg-gradient-to-br from-white/95 via-cyan-50/65 to-sky-50/80">
             <div>
               <p className="text-sm text-muted">后台管理</p>
diff --git a/web/src/app/page.tsx b/web/src/app/page.tsx
index 8b8940d..9213e93 100644
--- a/web/src/app/page.tsx
+++ b/web/src/app/page.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import Link from "next/link";
-import { FormEvent, useMemo, useState } from "react";
+import { FormEvent, useEffect, useState } from "react";
 
 import { useAuth } from "@/components/auth-provider";
 import { API_BASE_URL, readApiError } from "@/lib/api";
@@ -9,6 +9,13 @@ import { API_BASE_URL, readApiError } from "@/lib/api";
 type Mode = "login" | "register";
 type PingResponse = { message: string };
 
+type RememberedCredentials = {
+  email: string;
+  password: string;
+};
+
+const REMEMBER_CREDENTIALS_KEY = "fquiz.remembered_credentials";
+
 export default function Home() {
   const { user, initializing, login, register, logout, hasPermission } = useAuth();
 
@@ -16,14 +23,29 @@ export default function Home() {
   const [email, setEmail] = useState("");
   const [username, setUsername] = useState("");
   const [password, setPassword] = useState("");
+  const [rememberPassword, setRememberPassword] = useState(false);
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState("");
   const [pingResult, setPingResult] = useState<PingResponse | null>(null);
 
-  const title = useMemo(
-    () => (mode === "login" ? "登录账号" : "注册新账号"),
-    [mode],
-  );
+  useEffect(() => {
+    try {
+      const raw = window.localStorage.getItem(REMEMBER_CREDENTIALS_KEY);
+      if (!raw) {
+        return;
+      }
+      const saved = JSON.parse(raw) as Partial<RememberedCredentials>;
+      if (typeof saved.email === "string") {
+        setEmail(saved.email);
+      }
+      if (typeof saved.password === "string") {
+        setPassword(saved.password);
+        setRememberPassword(true);
+      }
+    } catch {
+      window.localStorage.removeItem(REMEMBER_CREDENTIALS_KEY);
+    }
+  }, []);
 
   const handleSubmit = async (event: FormEvent<HTMLFormElement>) => {
     event.preventDefault();
@@ -32,6 +54,15 @@ export default function Home() {
     try {
       if (mode === "login") {
         await login(email, password);
+        if (rememberPassword) {
+          const credentials: RememberedCredentials = { email, password };
+          window.localStorage.setItem(
+            REMEMBER_CREDENTIALS_KEY,
+            JSON.stringify(credentials),
+          );
+        } else {
+          window.localStorage.removeItem(REMEMBER_CREDENTIALS_KEY);
+        }
       } else {
         await register(email, username, password);
       }
@@ -156,11 +187,14 @@ export default function Home() {
           </div>
 
           <form className="space-y-3" onSubmit={handleSubmit}>
-            <h2 className="text-base font-medium">{title}</h2>
+            <h2 className="text-base font-medium">
+              {mode === "login" ? "登录" : "注册"}
+            </h2>
             <input
               className="control w-full"
               placeholder="Email"
               type="email"
+              autoComplete="username"
               value={email}
               onChange={(event) => setEmail(event.target.value)}
               required
@@ -181,12 +215,23 @@ export default function Home() {
               className="control w-full"
               placeholder="Password (>= 8 chars)"
               type="password"
+              autoComplete={mode === "login" ? "current-password" : "new-password"}
               value={password}
               onChange={(event) => setPassword(event.target.value)}
               minLength={8}
               maxLength={128}
               required
             />
+            {mode === "login" && (
+              <label className="flex items-center gap-2 text-sm text-muted">
+                <input
+                  type="checkbox"
+                  checked={rememberPassword}
+                  onChange={(event) => setRememberPassword(event.target.checked)}
+                />
+                记住密码
+              </label>
+            )}
             <button
               className="btn-primary"
               disabled={busy}