diff --git a/src/app/sidebar/components/guest-panel.tsx b/src/app/sidebar/components/guest-panel.tsx
new file mode 100644
index 00000000..917447c0
--- /dev/null
+++ b/src/app/sidebar/components/guest-panel.tsx
@@ -0,0 +1,39 @@
+"use client";
+
+import Link from "next/link";
+
+import { ROUTES } from "@/router/routes";
+
+import styles from "./sidebar-screen.module.css";
+
+/**
+ * 未登录态欢迎面板
+ *
+ * 显示欢迎语与 Sign in / Sign up 入口。
+ */
+export function GuestPanel() {
+  return (
+    <div className={styles.guestPanel}>
+      <h2 className={styles.guestTitle}>Welcome to CozSweet</h2>
+      <p className={styles.guestSubtitle}>
+        Sign in to sync your chats and unlock VIP.
+      </p>
+      <div className={styles.guestActions}>
+        <Link
+          href={ROUTES.auth}
+          className={styles.guestPrimaryLink}
+          aria-label="Sign up"
+        >
+          Sign up
+        </Link>
+        <Link
+          href={ROUTES.auth}
+          className={styles.guestSecondaryLink}
+          aria-label="Sign in"
+        >
+          Sign in
+        </Link>
+      </div>
+    </div>
+  );
+}
diff --git a/src/app/sidebar/components/index.ts b/src/app/sidebar/components/index.ts
index 16945812..49b73419 100644
--- a/src/app/sidebar/components/index.ts
+++ b/src/app/sidebar/components/index.ts
@@ -2,4 +2,7 @@
  * @file Automatically generated by barrelsby.
  */
 
+export * from "./guest-panel";
 export * from "./sidebar-screen";
+export * from "./user-info-card";
+export * from "./vip-cta";
diff --git a/src/app/sidebar/components/sidebar-screen.module.css b/src/app/sidebar/components/sidebar-screen.module.css
index 5a6b2540..008326cf 100644
--- a/src/app/sidebar/components/sidebar-screen.module.css
+++ b/src/app/sidebar/components/sidebar-screen.module.css
@@ -47,3 +47,229 @@
   align-items: flex-start;
   gap: var(--spacing-lg, 16px);
 }
+
+/* ============================================================
+ * 用户信息区
+ * ============================================================ */
+.profileArea {
+  padding: 0 var(--spacing-md, 12px);
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  gap: var(--spacing-lg, 16px);
+  width: 100%;
+}
+
+.userInfoCard {
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-md, 12px);
+  padding: var(--spacing-lg, 16px);
+  background: var(--color-settings-card-background, #ffffff);
+  border-radius: var(--radius-lg, 12px);
+  color: #000;
+  width: 100%;
+  box-sizing: border-box;
+}
+
+.userInfoAvatar {
+  border-radius: var(--radius-full, 999px);
+  object-fit: cover;
+  flex-shrink: 0;
+}
+
+.userInfoAvatarFallback {
+  width: 64px;
+  height: 64px;
+  border-radius: var(--radius-full, 999px);
+  background: var(--color-settings-row-background, #f2f2f2);
+  color: #000;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-size: var(--font-size-xl, 20px);
+  font-weight: 600;
+  flex-shrink: 0;
+}
+
+.userInfoText {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-xs, 4px);
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+.userInfoNameRow {
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-sm, 8px);
+  min-width: 0;
+}
+
+.userInfoName {
+  font-size: var(--font-size-lg, 16px);
+  font-weight: 600;
+  color: #000;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  min-width: 0;
+}
+
+.userInfoEmail {
+  font-size: var(--font-size-sm, 14px);
+  color: var(--color-text-secondary, #666);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.userInfoCoinRow {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--spacing-xs, 4px);
+  font-size: var(--font-size-sm, 14px);
+  color: var(--color-text-secondary, #666);
+}
+
+.vipBadge {
+  display: inline-flex;
+  align-items: center;
+  padding: 2px var(--spacing-sm, 8px);
+  border-radius: var(--radius-full, 999px);
+  background: var(--color-accent, #7c5cff);
+  color: var(--color-text-primary, #ffffff);
+  font-size: var(--font-size-xs, 12px);
+  font-weight: 600;
+  letter-spacing: 0.5px;
+  flex-shrink: 0;
+}
+
+.vipCta {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--spacing-md, 12px) var(--spacing-lg, 16px);
+  border-radius: var(--radius-full, 999px);
+  background: linear-gradient(
+    90deg,
+    var(--color-button-gradient-start, #7c5cff),
+    var(--color-button-gradient-end, #b48bff)
+  );
+  color: var(--color-text-primary, #ffffff);
+  font-size: var(--font-size-lg, 16px);
+  font-weight: 600;
+  border: 0;
+  cursor: pointer;
+  width: 100%;
+  text-decoration: none;
+}
+
+.vipCta:hover {
+  opacity: 0.9;
+}
+
+.vipCta:focus-visible {
+  outline: 2px solid var(--color-accent, #7c5cff);
+  outline-offset: 2px;
+}
+
+/* ============================================================
+ * 未登录态 GuestPanel
+ * ============================================================ */
+.guestPanel {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-md, 12px);
+  padding: var(--spacing-lg, 16px);
+  background: var(--color-settings-card-background, #ffffff);
+  border-radius: var(--radius-lg, 12px);
+  color: #000;
+  width: 100%;
+  box-sizing: border-box;
+}
+
+.guestTitle {
+  font-size: var(--font-size-xl, 20px);
+  font-weight: 600;
+  color: #000;
+  margin: 0;
+}
+
+.guestSubtitle {
+  font-size: var(--font-size-sm, 14px);
+  color: var(--color-text-secondary, #666);
+  margin: 0;
+}
+
+.guestActions {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-sm, 8px);
+  margin-top: var(--spacing-sm, 8px);
+}
+
+.guestPrimaryLink {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--spacing-md, 12px) var(--spacing-lg, 16px);
+  border-radius: var(--radius-full, 999px);
+  background: linear-gradient(
+    90deg,
+    var(--color-button-gradient-start, #7c5cff),
+    var(--color-button-gradient-end, #b48bff)
+  );
+  color: var(--color-text-primary, #ffffff);
+  font-size: var(--font-size-lg, 16px);
+  font-weight: 600;
+  text-decoration: none;
+  border: 0;
+}
+
+.guestPrimaryLink:hover {
+  opacity: 0.9;
+}
+
+.guestSecondaryLink {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--spacing-md, 12px) var(--spacing-lg, 16px);
+  border-radius: var(--radius-full, 999px);
+  background: transparent;
+  color: #000;
+  font-size: var(--font-size-lg, 16px);
+  font-weight: 600;
+  text-decoration: none;
+  border: 1px solid var(--color-auth-border, #d0d0d0);
+}
+
+.guestSecondaryLink:hover {
+  background: var(--color-settings-row-background, #f2f2f2);
+}
+
+/* ============================================================
+ * 骨架占位
+ * ============================================================ */
+.skeleton {
+  display: block;
+  background: var(--color-settings-row-background, #e5e5e5);
+  border-radius: var(--radius-md, 8px);
+}
+
+.skeletonMd {
+  width: 60%;
+  height: 18px;
+}
+
+.skeletonSm {
+  width: 80%;
+  height: 14px;
+}
+
+.skeletonXs {
+  width: 40%;
+  height: 14px;
+}
diff --git a/src/app/sidebar/components/sidebar-screen.tsx b/src/app/sidebar/components/sidebar-screen.tsx
index e689c446..af66deec 100644
--- a/src/app/sidebar/components/sidebar-screen.tsx
+++ b/src/app/sidebar/components/sidebar-screen.tsx
@@ -7,21 +7,33 @@ import { useRouter } from "next/navigation";
 import { MobileShell } from "@/app/_components/core/mobile-shell";
 import { SettingsSection } from "@/app/_components/core/settings-section";
 import { useUserDispatch, useUserState } from "@/stores/user/user-context";
-import { useAuthDispatch } from "@/stores/auth/auth-context";
+import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 import { ROUTES } from "@/router/routes";
 
 import type { UserView } from "@/models/user/user";
 
+import { GuestPanel } from "./guest-panel";
+import { UserInfoCard } from "./user-info-card";
+import { VipCta } from "./vip-cta";
+
 import styles from "./sidebar-screen.module.css";
 
 /**
  * 侧边栏主屏幕
  *
+ * 根据 `loginStatus + currentUser.isVip` 派生三种状态：
+ *   - guest：未登录，展示欢迎面板
+ *   - member：已登录未购买 VIP，展示用户信息 + Get VIP CTA
+ *   - vip：已登录且购买 VIP，展示用户信息（含 VIP 徽章） + Manage VIP CTA
+ *
  * 原始 Dart: lib/ui/sidebar/sidebar_screen.dart + profile_view.dart
  */
+type SidebarState = "guest" | "member" | "vip";
+
 export function SidebarScreen() {
   const user = useUserState();
   const userDispatch = useUserDispatch();
+  const auth = useAuthState();
   const authDispatch = useAuthDispatch();
   const router = useRouter();
 
@@ -45,6 +57,14 @@ export function SidebarScreen() {
     }
   }, [user.currentUser, authDispatch, router]);
 
+  // 状态派生：未登录 / 已登录未 VIP / 已登录 VIP
+  const sidebarState: SidebarState =
+    auth.loginStatus === "notLoggedIn"
+      ? "guest"
+      : user.currentUser?.isVip === true
+        ? "vip"
+        : "member";
+
   return (
     <MobileShell>
       <div className={styles.shell}>
@@ -71,25 +91,53 @@ export function SidebarScreen() {
           </Link>
         </div>
 
-        {/* 设置区域：与 Flutter SettingsSection 对齐 */}
-        <div className={styles.settingsArea}>
-          <SettingsSection
-            title="Other"
-            items={[
-              {
-                id: "membership",
-                title: "Membership",
-                onClick: () => router.push(ROUTES.subscription),
-              },
-              {
-                id: "logout",
-                title: "Log out",
-                destructive: true,
-                onClick: () => userDispatch({ type: "UserLogout" }),
-              },
-            ]}
-          />
+        {/* 用户信息区：三种状态 */}
+        <div className={styles.profileArea}>
+          {sidebarState === "guest" ? (
+            <GuestPanel />
+          ) : user.currentUser == null ? (
+            // 已登录但 currentUser 仍在初始化 → 骨架占位
+            <div className={styles.userInfoCard} aria-hidden="true">
+              <div className={styles.userInfoAvatarFallback} />
+              <div className={styles.userInfoText}>
+                <div className={`${styles.skeleton} ${styles.skeletonMd}`} />
+                <div className={`${styles.skeleton} ${styles.skeletonSm}`} />
+                <div className={`${styles.skeleton} ${styles.skeletonXs}`} />
+              </div>
+            </div>
+          ) : (
+            <>
+              <UserInfoCard
+                user={user.currentUser}
+                coinBalance={user.coinBalance}
+                isVip={sidebarState === "vip"}
+              />
+              <VipCta variant={sidebarState === "vip" ? "manage" : "get"} />
+            </>
+          )}
         </div>
+
+        {/* 设置区域：仅已登录态保留 Log out；与 Flutter SettingsSection 对齐 */}
+        {sidebarState !== "guest" ? (
+          <div className={styles.settingsArea}>
+            <SettingsSection
+              title="Other"
+              items={[
+                {
+                  id: "membership",
+                  title: "Membership",
+                  onClick: () => router.push(ROUTES.subscription),
+                },
+                {
+                  id: "logout",
+                  title: "Log out",
+                  destructive: true,
+                  onClick: () => userDispatch({ type: "UserLogout" }),
+                },
+              ]}
+            />
+          </div>
+        ) : null}
       </div>
     </MobileShell>
   );
diff --git a/src/app/sidebar/components/user-info-card.tsx b/src/app/sidebar/components/user-info-card.tsx
new file mode 100644
index 00000000..dbafb219
--- /dev/null
+++ b/src/app/sidebar/components/user-info-card.tsx
@@ -0,0 +1,81 @@
+"use client";
+
+import Image from "next/image";
+
+import type { UserView } from "@/models/user/user";
+
+import styles from "./sidebar-screen.module.css";
+
+export interface UserInfoCardProps {
+  user: UserView;
+  coinBalance: number;
+  isVip: boolean;
+}
+
+/**
+ * 已登录用户信息卡片
+ *
+ * 头像 + 用户名（+ VIP 徽章）+ 邮箱 + 金币余额。
+ */
+export function UserInfoCard({ user, coinBalance, isVip }: UserInfoCardProps) {
+  const initial = (user.username?.[0] ?? "?").toUpperCase();
+  const hasAvatar = user.avatarUrl && user.avatarUrl.length > 0;
+
+  return (
+    <div className={styles.userInfoCard}>
+      {hasAvatar ? (
+        <Image
+          src={user.avatarUrl}
+          alt=""
+          width={64}
+          height={64}
+          className={styles.userInfoAvatar}
+        />
+      ) : (
+        <div
+          className={styles.userInfoAvatarFallback}
+          aria-hidden="true"
+          role="img"
+          aria-label={user.username}
+        >
+          {initial}
+        </div>
+      )}
+      <div className={styles.userInfoText}>
+        <div className={styles.userInfoNameRow}>
+          <span className={styles.userInfoName} title={user.username}>
+            {user.username}
+          </span>
+          {isVip ? (
+            <span className={styles.vipBadge} aria-label="VIP">
+              VIP
+            </span>
+          ) : null}
+        </div>
+        {user.email ? (
+          <span className={styles.userInfoEmail} title={user.email}>
+            {user.email}
+          </span>
+        ) : null}
+        <div className={styles.userInfoCoinRow}>
+          <svg
+            width="14"
+            height="14"
+            viewBox="0 0 24 24"
+            fill="none"
+            aria-hidden="true"
+          >
+            <circle
+              cx="12"
+              cy="12"
+              r="9"
+              stroke="currentColor"
+              strokeWidth="2"
+            />
+          </svg>
+          <span>{coinBalance} coins</span>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/app/sidebar/components/vip-cta.tsx b/src/app/sidebar/components/vip-cta.tsx
new file mode 100644
index 00000000..d4c2bc60
--- /dev/null
+++ b/src/app/sidebar/components/vip-cta.tsx
@@ -0,0 +1,45 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+
+import { ROUTES } from "@/router/routes";
+
+import styles from "./sidebar-screen.module.css";
+
+export type VipCtaVariant = "get" | "manage";
+
+export interface VipCtaProps {
+  variant: VipCtaVariant;
+  onClick?: () => void;
+}
+
+/**
+ * VIP CTA 按钮
+ *
+ * - `get`：未购买 VIP 时显示 "Get VIP"
+ * - `manage`：已购买 VIP 时显示 "Manage VIP"
+ *
+ * 默认点击跳转 `/subscription`（订阅页）；调用方可传入 `onClick` 覆盖。
+ */
+export function VipCta({ variant, onClick }: VipCtaProps) {
+  const router = useRouter();
+  const label = variant === "get" ? "Get VIP" : "Manage VIP";
+  const handleClick = () => {
+    if (onClick) {
+      onClick();
+    } else {
+      router.push(ROUTES.subscription);
+    }
+  };
+
+  return (
+    <button
+      type="button"
+      className={styles.vipCta}
+      onClick={handleClick}
+      aria-label={label}
+    >
+      {label}
+    </button>
+  );
+}
diff --git a/src/data/storage/chat/chat_storage.ts b/src/data/storage/chat/chat_storage.ts
index 561c1027..eb7a242a 100644
--- a/src/data/storage/chat/chat_storage.ts
+++ b/src/data/storage/chat/chat_storage.ts
@@ -22,7 +22,7 @@ import { GuestChatQuota as GuestChatQuotaDto } from "@/data/dto/chat/guest_chat_
 import { z } from "zod";
 
 import { type Result as ResultT, Result } from "@/utils/result";
-import { formatDate } from "@/utils/date";
+import { todayString } from "@/utils/date";
 import { SpAsyncUtil } from "@/utils/storage";
 import { StorageKeys } from "../storage_keys";
 import type { IChatStorage } from "./ichat_storage";
@@ -51,7 +51,7 @@ export class ChatStorage implements IChatStorage {
       if (existing.success && existing.data != null) {
         return existing;
       }
-      const today = formatDate(new Date());
+      const today = todayString(new Date());
       const initResult = await this.setGuestDailyChatQuota(
         GuestChatQuotaDto.threshold,
         today,
diff --git a/src/models/user/user.ts b/src/models/user/user.ts
index 8c2c02ed..87585fb5 100644
--- a/src/models/user/user.ts
+++ b/src/models/user/user.ts
@@ -15,6 +15,7 @@ export const UserViewSchema = z.object({
   relationshipStage: z.string(),
   currentMood: z.string(),
   isGuest: z.boolean(),
+  isVip: z.boolean(),
 });
 
 export type UserView = z.infer<typeof UserViewSchema>;
diff --git a/src/stores/user/user-machine.ts b/src/stores/user/user-machine.ts
index e403eb78..cc72a661 100644
--- a/src/stores/user/user-machine.ts
+++ b/src/stores/user/user-machine.ts
@@ -49,6 +49,7 @@ function toView(u: {
   relationshipStage?: string;
   currentMood?: string;
   isGuest?: boolean;
+  isVip?: boolean;
 }): UserView {
   return {
     id: u.id,
@@ -60,6 +61,7 @@ function toView(u: {
     relationshipStage: u.relationshipStage ?? "",
     currentMood: u.currentMood ?? "",
     isGuest: u.isGuest ?? false,
+    isVip: u.isVip ?? false,
   };
 }