diff --git "a/docs/architecture-guidelines \353\263\265\354\202\254\353\263\270.md" "b/docs/architecture-guidelines \353\263\265\354\202\254\353\263\270.md"
new file mode 100644
index 0000000..5393360
--- /dev/null
+++ "b/docs/architecture-guidelines \353\263\265\354\202\254\353\263\270.md"	
@@ -0,0 +1,48 @@
+# Architecture Guidelines
+
+This project uses three layers with fixed responsibilities.
+
+## Layer Rules
+
+- `src/components`: small, reusable UI building blocks only.
+- `src/features`: domain logic, state, data access, and feature-level UI composition.
+- `src/app`: routing, page entry, and feature composition only.
+
+## Allowed Imports
+
+- `src/app` -> `src/features`, `src/components`, `src/lib`
+- `src/features` -> `src/components`, `src/lib`, same feature internals
+- `src/components` -> `src/components/ui`, `src/lib`
+
+## Disallowed Imports
+
+- `src/components` -> `src/features`
+- `src/components` -> `src/app`
+- `src/lib` -> `src/app`, `src/features`, `src/components`
+
+## Import Pattern Examples
+
+Allowed:
+
+```ts
+// src/app/page.tsx
+import { ChatShell } from "@/features/shell/ui/chat-shell";
+```
+
+```ts
+// src/features/chat/ui/chat-thread.tsx
+import { MessageBubble } from "@/features/chat/ui/message-bubble";
+import { cn } from "@/lib/utils";
+```
+
+Disallowed:
+
+```ts
+// src/components/ui/card.tsx
+import { useChatStore } from "@/features/chat/model/store";
+```
+
+```ts
+// src/lib/date.ts
+import { ChatShell } from "@/features/shell/ui/chat-shell";
+```
diff --git a/src/features/auth/ui/login-panel.tsx b/src/features/auth/ui/login-panel.tsx
index 2413591..fa1aec9 100644
--- a/src/features/auth/ui/login-panel.tsx
+++ b/src/features/auth/ui/login-panel.tsx
@@ -8,6 +8,14 @@ import { useEffect, useState } from "react";
 import { toast } from "sonner";
 
 import { Button } from "@/components/ui/button";
+import {
+  Drawer,
+  DrawerClose,
+  DrawerContent,
+  DrawerHeader,
+  DrawerTitle,
+  DrawerTrigger,
+} from "@/components/ui/drawer";
 import { useAuthSession } from "@/features/auth/model/use-auth-session";
 import { cn } from "@/lib/utils";
 
@@ -107,6 +115,65 @@ export function LoginPanel() {
           >
             이용약관
           </Link>
+          <span>·</span>
+          <Drawer>
+            <DrawerTrigger asChild>
+              <button
+                type="button"
+                className="underline underline-offset-4 hover:text-foreground"
+              >
+                사업자 정보
+              </button>
+            </DrawerTrigger>
+            <DrawerContent>
+              <DrawerHeader>
+                <DrawerTitle>사업자 정보</DrawerTitle>
+              </DrawerHeader>
+              <div className="space-y-1.5 px-4 pb-2 text-[13px] leading-relaxed text-muted-foreground">
+                <p className="font-semibold text-foreground">
+                  좋은공간 미디어 | 대표 : 윤성현
+                </p>
+                <p>
+                  부산광역시 북구 낙동북로 772번가길 28, 지하 1층(구포동)
+                </p>
+                <p>
+                  사업자 등록번호 : 621-14-25692{" "}
+                  <a
+                    href="https://www.ftc.go.kr/bizCommPop.do?wrkr_no=6211425692"
+                    target="_blank"
+                    rel="noreferrer noopener"
+                    className="text-primary underline underline-offset-4"
+                  >
+                    [사업자 번호 조회]
+                  </a>
+                </p>
+                <p>통신판매번호 : 2018-부산북구-0094</p>
+                <p>
+                  이메일 문의 :{" "}
+                  <a
+                    href="mailto:ccc9020@hanmail.net"
+                    className="text-primary underline underline-offset-4"
+                  >
+                    ccc9020@hanmail.net
+                  </a>
+                </p>
+              </div>
+              <div className="px-4 pb-6 pt-2">
+                <p className="text-center text-[11px] text-muted-foreground/60">
+                  &copy; {new Date().getFullYear()} 좋은공간 미디어. All rights
+                  reserved.
+                </p>
+                <DrawerClose asChild>
+                  <button
+                    type="button"
+                    className="mt-3 w-full rounded-xl bg-muted py-3 text-sm font-medium text-foreground"
+                  >
+                    닫기
+                  </button>
+                </DrawerClose>
+              </div>
+            </DrawerContent>
+          </Drawer>
         </div>
       </div>
     </div>