feat: 랜딩페이지 완성 및 에디터 홈 버튼 기능 구현

주요 변경사항:
- 🎨 가격 섹션을 CTA 섹션과 동일한 그라디언트 스타일로 변경
- 🗑️ 중복된 CTA 섹션 제거 및 페이지 구성 최적화
- 🏠 에디터 상단 로고 클릭 시 홈 이동 기능 추가 (저장 경고 포함)
- 📱 인증 페이지 컴포넌트 추가 (SignIn/SignUp)
- 💰 가격 정보 섹션 및 FAQ 섹션 추가
- 🔧 TopBar 컴포넌트에 로고 클릭 핸들러 추가

UI/UX 개선:
- 가격 섹션: 파란색-보라색 그라디언트 배경 적용
- 카드 스타일: 반투명 배경 및 backdrop-blur 효과
- 텍스트 색상: 그라디언트 배경에 맞는 흰색/파란색 톤 적용
- 버튼 스타일: 인기 플랜 노란색 강조, 일반 플랜 반투명 스타일

기능 추가:
- 에디터에서 로고 클릭 시 작업 손실 경고 및 홈 이동
- 완전한 인증 플로우 UI 구성
- 반응형 가격 정보 표시

src/App.tsx

@@ -1,71 +1,335 @@
 import { useState } from "react";
 import { Button } from "./components/ui/button";
-import HomeButton from "./components/ui/homeButton";
+import { TopBar } from "./components/ui/topbar";
 import { lazy, Suspense } from "react";
 import LandingPage from "./components/LandingPage";
+import { SignUpPage } from "./components/auth/SignUpPage";
+import { SignInPage } from "./components/auth/SignInPage";
+import { useAppStore } from "./stores/useAppStore";
 
 // 동적 import로 EditSheetViewer 로드 (필요할 때만)
 const EditSheetViewer = lazy(
   () => import("./components/sheet/EditSheetViewer"),
 );
 
+// 앱 상태 타입 정의
+type AppView = "landing" | "signUp" | "signIn" | "editor" | "account";
+
 function App() {
-  const [showTestViewer, setShowTestViewer] = useState(false);
+  const [currentView, setCurrentView] = useState<AppView>("landing");
+  const { isAuthenticated, setAuthenticated, setUser, user, currentFile } =
+    useAppStore();
 
+  // CTA 버튼 클릭 핸들러 - 인증 상태에 따른 분기 처리
   const handleGetStarted = () => {
-    setShowTestViewer(true);
-  };
-
-  const handleDownloadClick = () => {
-    // TODO: 다운로드 기능 구현
-    console.log("Download clicked");
-  };
-
-  const handleAccountClick = () => {
-    // TODO: 계정 페이지 이동 기능 구현
-    console.log("Account clicked");
-  };
-
-  return (
-    <div className="min-h-screen">
-      {showTestViewer ? (
-        // 에디트 뷰어 모드
-        <div className="min-h-screen bg-gray-50">
-          {/* 헤더 */}
-          <header className="bg-white shadow-sm border-b">
-            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
-              <div className="flex justify-between items-center h-16">
-                <div className="flex items-center">
-                  <HomeButton
-                    className="ml-0"
-                    style={{ position: "absolute", left: "1%" }}
-                    onClick={() => {
-                      if (window.confirm("랜딩페이지로 돌아가시겠습니까?")) {
-                        setShowTestViewer(false);
+    if (isAuthenticated) {
+      // 이미 로그인된 사용자는 바로 에디터로 이동
+      setCurrentView("editor");
+    } else {
+      // 미인증 사용자는 가입 페이지로 이동
+      setCurrentView("signUp");
     }
-                    }}
-                  >
-                    sheetEasy AI
-                  </HomeButton>
-                </div>
-                <div className="flex items-center space-x-4">
-                  <Button
-                    variant="outline"
-                    size="sm"
-                    onClick={() => setShowTestViewer(false)}
-                    className="bg-green-500 hover:bg-green-600 text-white border-green-500"
-                  >
-                    🏠 홈으로
-                  </Button>
-                  <span className="text-sm text-gray-600">
-                    Univer CE 에디트 모드
-                  </span>
-                </div>
-              </div>
-            </div>
-          </header>
+  };
 
-          {/* 메인 콘텐츠 */}
+  // 다운로드 클릭 핸들러
+  const handleDownloadClick = () => {
+    if (currentFile?.xlsxBuffer) {
+      // XLSX ArrayBuffer를 Blob으로 변환하여 다운로드
+      const blob = new Blob([currentFile.xlsxBuffer], {
+        type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+      });
+      const url = URL.createObjectURL(blob);
+      const link = document.createElement("a");
+      link.href = url;
+      link.download = currentFile.name || "sheet.xlsx";
+      document.body.appendChild(link);
+      link.click();
+      document.body.removeChild(link);
+      URL.revokeObjectURL(url);
+    } else {
+      alert("다운로드할 파일이 없습니다. 파일을 먼저 업로드해주세요.");
+    }
+  };
+
+  // 계정 클릭 핸들러
+  const handleAccountClick = () => {
+    if (isAuthenticated) {
+      setCurrentView("account");
+    } else {
+      setCurrentView("signIn");
+    }
+  };
+
+  // 데모보기 버튼 클릭 핸들러 - 에디터로 바로 이동
+  const handleDemoClick = () => {
+    setCurrentView("editor");
+  };
+
+  // 가입 처리 핸들러
+  const handleSignUp = (email: string, password: string) => {
+    // TODO: 실제 API 연동
+    console.log("가입 요청:", { email, password });
+
+    // 임시로 자동 로그인 처리
+    setUser({
+      id: "temp-user-id",
+      email,
+      name: email.split("@")[0],
+      createdAt: new Date(),
+      lastLoginAt: new Date(),
+      subscription: {
+        plan: "free",
+        status: "active",
+        currentPeriodStart: new Date(),
+        currentPeriodEnd: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000), // 30일 후
+        usage: {
+          aiQueries: 0,
+          cellCount: 0,
+          resetDate: new Date(),
+        },
+      },
+      preferences: {
+        language: "ko",
+        historyPanelPosition: "right",
+        autoSave: true,
+        showAnimations: true,
+      },
+    });
+    setAuthenticated(true);
+    setCurrentView("editor");
+  };
+
+  // 로그인 처리 핸들러
+  const handleSignIn = (email: string, password: string) => {
+    // TODO: 실제 API 연동
+    console.log("로그인 요청:", { email, password });
+
+    // 임시로 자동 로그인 처리
+    setUser({
+      id: "temp-user-id",
+      email,
+      name: email.split("@")[0],
+      createdAt: new Date(),
+      lastLoginAt: new Date(),
+      subscription: {
+        plan: "lite",
+        status: "active",
+        currentPeriodStart: new Date(),
+        currentPeriodEnd: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000), // 30일 후
+        usage: {
+          aiQueries: 15,
+          cellCount: 234,
+          resetDate: new Date(),
+        },
+      },
+      preferences: {
+        language: "ko",
+        historyPanelPosition: "right",
+        autoSave: true,
+        showAnimations: true,
+      },
+    });
+    setAuthenticated(true);
+    setCurrentView("editor");
+  };
+
+  // 로그아웃 핸들러
+  const handleLogout = () => {
+    setUser(null);
+    setAuthenticated(false);
+    setCurrentView("landing");
+  };
+
+  // 뷰 전환 핸들러들
+  const handleBackToLanding = () => setCurrentView("landing");
+  const handleGoToSignIn = () => setCurrentView("signIn");
+  const handleGoToSignUp = () => setCurrentView("signUp");
+  const handleGoToEditor = () => setCurrentView("editor");
+
+  // 에디터에서 홈으로 돌아가기 핸들러 (워닝 포함)
+  const handleEditorLogoClick = () => {
+    const confirmed = window.confirm(
+      "편집 중인 작업이 있습니다. 홈으로 돌아가면 저장되지 않은 작업이 손실될 수 있습니다.\n\n정말로 홈으로 돌아가시겠습니까?",
+    );
+
+    if (confirmed) {
+      setCurrentView("landing");
+    }
+  };
+
+  // 현재 뷰에 따른 렌더링
+  const renderCurrentView = () => {
+    switch (currentView) {
+      case "signUp":
+        return (
+          <div className="min-h-screen bg-gray-50">
+            <TopBar
+              showDownload={false}
+              showAccount={false}
+              showNavigation={false}
+              showAuthButtons={false}
+              onAccountClick={handleAccountClick}
+            />
+            <main className="container mx-auto py-8">
+              <SignUpPage
+                onSignUp={handleSignUp}
+                onSignInClick={handleGoToSignIn}
+                onBack={handleBackToLanding}
+              />
+            </main>
+          </div>
+        );
+
+      case "signIn":
+        return (
+          <div className="min-h-screen bg-gray-50">
+            <TopBar
+              showDownload={false}
+              showAccount={false}
+              showNavigation={false}
+              showAuthButtons={false}
+              onAccountClick={handleAccountClick}
+            />
+            <main className="container mx-auto py-8">
+              <SignInPage
+                onSignIn={handleSignIn}
+                onSignUpClick={handleGoToSignUp}
+                onBack={handleBackToLanding}
+              />
+            </main>
+          </div>
+        );
+
+      case "account":
+        return (
+          <div className="min-h-screen bg-gray-50">
+            <TopBar
+              showDownload={false}
+              showAccount={true}
+              showNavigation={false}
+              showAuthButtons={false}
+              onAccountClick={handleAccountClick}
+            />
+            <main className="container mx-auto py-8">
+              <div className="max-w-2xl mx-auto bg-white rounded-lg shadow-md p-6">
+                <h1 className="text-2xl font-bold mb-6">계정 정보</h1>
+
+                {/* 사용자 정보 */}
+                <div className="mb-6">
+                  <h2 className="text-lg font-semibold mb-3">사용자 정보</h2>
+                  <div className="space-y-2">
+                    <p>
+                      <strong>이메일:</strong> {user?.email}
+                    </p>
+                    <p>
+                      <strong>이름:</strong> {user?.name}
+                    </p>
+                    <p>
+                      <strong>가입일:</strong>{" "}
+                      {user?.createdAt?.toLocaleDateString()}
+                    </p>
+                    <p>
+                      <strong>최근 로그인:</strong>{" "}
+                      {user?.lastLoginAt?.toLocaleDateString()}
+                    </p>
+                  </div>
+                </div>
+
+                {/* 구독 정보 */}
+                <div className="mb-6">
+                  <h2 className="text-lg font-semibold mb-3">구독 정보</h2>
+                  <div className="space-y-2">
+                    <p>
+                      <strong>플랜:</strong>{" "}
+                      {user?.subscription?.plan?.toUpperCase()}
+                    </p>
+                    <p>
+                      <strong>상태:</strong> {user?.subscription?.status}
+                    </p>
+                    <p>
+                      <strong>다음 결제일:</strong>{" "}
+                      {user?.subscription?.currentPeriodEnd?.toLocaleDateString()}
+                    </p>
+                  </div>
+                </div>
+
+                {/* 사용량 */}
+                <div className="mb-6">
+                  <h2 className="text-lg font-semibold mb-3">사용량</h2>
+                  <div className="space-y-2">
+                    <p>
+                      <strong>AI 쿼리:</strong>{" "}
+                      {user?.subscription?.usage?.aiQueries} /{" "}
+                      {user?.subscription?.plan === "free"
+                        ? "30"
+                        : user?.subscription?.plan === "lite"
+                          ? "100"
+                          : "500"}
+                    </p>
+                    <p>
+                      <strong>셀 카운트:</strong>{" "}
+                      {user?.subscription?.usage?.cellCount} /{" "}
+                      {user?.subscription?.plan === "free"
+                        ? "300"
+                        : user?.subscription?.plan === "lite"
+                          ? "1000"
+                          : "5000"}
+                    </p>
+                  </div>
+                </div>
+
+                {/* 설정 */}
+                <div className="mb-6">
+                  <h2 className="text-lg font-semibold mb-3">설정</h2>
+                  <div className="space-y-2">
+                    <p>
+                      <strong>언어:</strong>{" "}
+                      {user?.preferences?.language === "ko"
+                        ? "한국어"
+                        : "English"}
+                    </p>
+                    <p>
+                      <strong>히스토리 패널 위치:</strong>{" "}
+                      {user?.preferences?.historyPanelPosition === "right"
+                        ? "우측"
+                        : "좌측"}
+                    </p>
+                  </div>
+                </div>
+
+                {/* 액션 버튼들 */}
+                <div className="flex space-x-4">
+                  <Button
+                    onClick={handleGoToEditor}
+                    className="bg-blue-600 hover:bg-blue-700 text-white"
+                  >
+                    에디터로 이동
+                  </Button>
+                  <Button
+                    onClick={handleLogout}
+                    variant="outline"
+                    className="border-red-500 text-red-500 hover:bg-red-50"
+                  >
+                    로그아웃
+                  </Button>
+                </div>
+              </div>
+            </main>
+          </div>
+        );
+
+      case "editor":
+        return (
+          <div className="min-h-screen bg-gray-50">
+            <TopBar
+              showDownload={true}
+              showAccount={true}
+              showNavigation={false}
+              showAuthButtons={false}
+              onDownloadClick={handleDownloadClick}
+              onAccountClick={handleAccountClick}
+              onLogoClick={handleEditorLogoClick}
+            />
             <main className="h-[calc(100vh-4rem)]">
               <div className="h-full">
                 <Suspense
@@ -83,16 +347,33 @@ function App() {
               </div>
             </main>
           </div>
-      ) : (
-        // 랜딩페이지 모드
+        );
+
+      case "landing":
+      default:
+        return (
+          <div className="min-h-screen">
+            <TopBar
+              showDownload={false}
+              showAccount={false}
+              showNavigation={true}
+              showAuthButtons={true}
+              onSignInClick={handleGoToSignIn}
+              onGetStartedClick={handleGetStarted}
+              onAccountClick={handleAccountClick}
+            />
             <LandingPage
               onGetStarted={handleGetStarted}
               onDownloadClick={handleDownloadClick}
               onAccountClick={handleAccountClick}
+              onDemoClick={handleDemoClick}
             />
-      )}
           </div>
         );
     }
+  };
+
+  return <div className="min-h-screen">{renderCurrentView()}</div>;
+}
 
 export default App;

src/components/LandingPage.tsx

@@ -1,14 +1,15 @@
 import * as React from "react";
-import { TopBar } from "./ui/topbar";
 import { HeroSection } from "./ui/hero-section";
 import { FeaturesSection } from "./ui/features-section";
-import { CTASection } from "./ui/cta-section";
+import { FAQSection } from "./ui/faq-section";
+import { PricingSection } from "./ui/pricing-section";
 import { Footer } from "./ui/footer";
 
 interface LandingPageProps {
   onGetStarted?: () => void;
   onDownloadClick?: () => void;
   onAccountClick?: () => void;
+  onDemoClick?: () => void;
 }
 
 /**
@@ -22,25 +23,23 @@ const LandingPage: React.FC<LandingPageProps> = ({
   onGetStarted,
   onDownloadClick,
   onAccountClick,
+  onDemoClick,
 }) => {
   return (
     <div className="min-h-screen bg-white">
-      {/* TopBar - 상단 고정 네비게이션 */}
-      <TopBar
-        onDownloadClick={onDownloadClick}
-        onAccountClick={onAccountClick}
-      />
-
       {/* Main Content */}
       <main role="main">
         {/* Hero Section - 메인 소개 및 CTA */}
-        <HeroSection onGetStarted={onGetStarted} />
+        <HeroSection onGetStarted={onGetStarted} onDemoClick={onDemoClick} />
 
         {/* Features Section - 주요 기능 소개 */}
         <FeaturesSection />
 
-        {/* CTA Section - 최종 행동 유도 */}
-        <CTASection onGetStarted={onGetStarted} />
+        {/* FAQ Section - 자주 묻는 질문 */}
+        <FAQSection />
+
+        {/* Pricing Section - 가격 정보 */}
+        <PricingSection onGetStarted={onGetStarted} />
       </main>
 
       {/* Footer - 푸터 정보 */}

src/components/auth/SignInPage.tsx

@@ -0,0 +1,269 @@
+import * as React from "react";
+import { useState } from "react";
+import { Button } from "../ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "../ui/card";
+import { cn } from "../../lib/utils";
+
+interface SignInPageProps {
+  className?: string;
+  onSignIn?: (email: string, password: string) => void;
+  onSignUpClick?: () => void;
+  onBack?: () => void;
+}
+
+/**
+ * 로그인 화면 컴포넌트
+ * Vooster.ai 스타일의 세련된 디자인
+ * 실제 API 연동은 나중에 구현
+ */
+const SignInPage = React.forwardRef<HTMLDivElement, SignInPageProps>(
+  ({ className, onSignIn, onSignUpClick, onBack, ...props }, ref) => {
+    const [email, setEmail] = useState("");
+    const [password, setPassword] = useState("");
+    const [isLoading, setIsLoading] = useState(false);
+    const [errors, setErrors] = useState<{
+      email?: string;
+      password?: string;
+      general?: string;
+    }>({});
+
+    // 이메일 유효성 검사
+    const validateEmail = (email: string) => {
+      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+      return emailRegex.test(email);
+    };
+
+    // 폼 제출 핸들러
+    const handleSubmit = async (e: React.FormEvent) => {
+      e.preventDefault();
+
+      // 유효성 검사
+      const newErrors: typeof errors = {};
+
+      if (!email) {
+        newErrors.email = "이메일을 입력해주세요.";
+      } else if (!validateEmail(email)) {
+        newErrors.email = "올바른 이메일 형식을 입력해주세요.";
+      }
+
+      if (!password) {
+        newErrors.password = "비밀번호를 입력해주세요.";
+      }
+
+      setErrors(newErrors);
+
+      if (Object.keys(newErrors).length > 0) {
+        return;
+      }
+
+      setIsLoading(true);
+
+      try {
+        // 로그인 처리 (실제 API 호출은 나중에)
+        await new Promise((resolve) => setTimeout(resolve, 1500)); // 시뮬레이션
+        onSignIn?.(email, password);
+      } catch (error) {
+        console.error("로그인 실패:", error);
+        setErrors({
+          general: "로그인에 실패했습니다. 이메일과 비밀번호를 확인해주세요.",
+        });
+      } finally {
+        setIsLoading(false);
+      }
+    };
+
+    return (
+      <div
+        ref={ref}
+        className={cn(
+          "min-h-screen bg-gradient-to-br from-slate-50 to-blue-50 flex items-center justify-center p-4",
+          className,
+        )}
+        {...props}
+      >
+        {/* Background decoration */}
+        <div className="absolute inset-0 bg-grid-slate-100 [mask-image:linear-gradient(0deg,transparent,black)]" />
+
+        <div className="relative w-full max-w-md">
+          {/* 로고 및 헤더 */}
+          <div className="text-center mb-8">
+            <h1 className="text-3xl font-bold text-gray-900 mb-2">
+              sheetEasy AI
+            </h1>
+            <p className="text-gray-600">
+              계정에 로그인하여 AI 편집을 계속하세요
+            </p>
+          </div>
+
+          {/* 로그인 폼 */}
+          <Card className="shadow-xl border-0 bg-white/95 backdrop-blur-sm">
+            <CardHeader className="text-center pb-6">
+              <CardTitle className="text-2xl font-semibold text-gray-900">
+                로그인
+              </CardTitle>
+              <p className="text-sm text-gray-600 mt-2">
+                계정에 다시 오신 것을 환영합니다
+              </p>
+            </CardHeader>
+
+            <CardContent className="space-y-6">
+              {/* 일반 오류 메시지 */}
+              {errors.general && (
+                <div className="p-3 bg-red-50 border border-red-200 rounded-lg">
+                  <p className="text-sm text-red-600">{errors.general}</p>
+                </div>
+              )}
+
+              <form onSubmit={handleSubmit} className="space-y-4">
+                {/* 이메일 입력 */}
+                <div className="space-y-2">
+                  <label
+                    htmlFor="email"
+                    className="text-sm font-medium text-gray-700"
+                  >
+                    이메일 주소
+                  </label>
+                  <input
+                    id="email"
+                    type="email"
+                    value={email}
+                    onChange={(e) => setEmail(e.target.value)}
+                    className={cn(
+                      "w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors",
+                      errors.email ? "border-red-500" : "border-gray-300",
+                    )}
+                    placeholder="your@email.com"
+                    disabled={isLoading}
+                  />
+                  {errors.email && (
+                    <p className="text-sm text-red-600">{errors.email}</p>
+                  )}
+                </div>
+
+                {/* 비밀번호 입력 */}
+                <div className="space-y-2">
+                  <label
+                    htmlFor="password"
+                    className="text-sm font-medium text-gray-700"
+                  >
+                    비밀번호
+                  </label>
+                  <input
+                    id="password"
+                    type="password"
+                    value={password}
+                    onChange={(e) => setPassword(e.target.value)}
+                    className={cn(
+                      "w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors",
+                      errors.password ? "border-red-500" : "border-gray-300",
+                    )}
+                    placeholder="비밀번호를 입력해주세요"
+                    disabled={isLoading}
+                  />
+                  {errors.password && (
+                    <p className="text-sm text-red-600">{errors.password}</p>
+                  )}
+                </div>
+
+                {/* 비밀번호 찾기 링크 */}
+                <div className="flex justify-end">
+                  <button
+                    type="button"
+                    className="text-sm text-blue-600 hover:text-blue-700 hover:underline"
+                    disabled={true} // 나중에 구현
+                  >
+                    비밀번호를 잊으셨나요? (준비중)
+                  </button>
+                </div>
+
+                {/* 로그인 버튼 */}
+                <Button
+                  type="submit"
+                  className="w-full bg-gradient-to-r from-green-500 to-blue-600 hover:from-green-600 hover:to-blue-700 text-white py-3 text-lg font-semibold shadow-lg hover:shadow-xl transition-all duration-300"
+                  disabled={isLoading}
+                >
+                  {isLoading ? (
+                    <div className="flex items-center justify-center">
+                      <div className="animate-spin rounded-full h-5 w-5 border-b-2 border-white mr-2"></div>
+                      로그인 중...
+                    </div>
+                  ) : (
+                    "로그인"
+                  )}
+                </Button>
+              </form>
+
+              {/* 소셜 로그인 (나중에 구현) */}
+              <div className="relative">
+                <div className="absolute inset-0 flex items-center">
+                  <div className="w-full border-t border-gray-300" />
+                </div>
+                <div className="relative flex justify-center text-sm">
+                  <span className="px-2 bg-white text-gray-500">또는</span>
+                </div>
+              </div>
+
+              <div className="space-y-3">
+                <Button
+                  type="button"
+                  variant="outline"
+                  className="w-full py-3 text-gray-700 border-gray-300 hover:bg-gray-50"
+                  disabled={true} // 나중에 구현
+                >
+                  <svg className="w-5 h-5 mr-2" viewBox="0 0 24 24">
+                    <path
+                      fill="currentColor"
+                      d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
+                    />
+                  </svg>
+                  Google로 로그인 (준비중)
+                </Button>
+              </div>
+
+              {/* 가입 링크 */}
+              <div className="text-center">
+                <p className="text-sm text-gray-600">
+                  아직 계정이 없으신가요?{" "}
+                  <button
+                    type="button"
+                    onClick={onSignUpClick}
+                    className="text-blue-600 hover:text-blue-700 font-medium hover:underline"
+                  >
+                    무료로 가입하기
+                  </button>
+                </p>
+              </div>
+            </CardContent>
+          </Card>
+
+          {/* 뒤로가기 버튼 */}
+          <div className="text-center mt-6">
+            <button
+              type="button"
+              onClick={onBack}
+              className="text-gray-600 hover:text-gray-700 text-sm hover:underline"
+            >
+              ← 메인화면으로 돌아가기
+            </button>
+          </div>
+        </div>
+      </div>
+    );
+  },
+);
+
+SignInPage.displayName = "SignInPage";
+
+export { SignInPage };

src/components/auth/SignUpPage.tsx

@@ -0,0 +1,291 @@
+import * as React from "react";
+import { useState } from "react";
+import { Button } from "../ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "../ui/card";
+import { cn } from "../../lib/utils";
+
+interface SignUpPageProps {
+  className?: string;
+  onSignUp?: (email: string, password: string) => void;
+  onSignInClick?: () => void;
+  onBack?: () => void;
+}
+
+/**
+ * 가입화면 컴포넌트
+ * Vooster.ai 스타일의 세련된 디자인
+ * 실제 API 연동은 나중에 구현
+ */
+const SignUpPage = React.forwardRef<HTMLDivElement, SignUpPageProps>(
+  ({ className, onSignUp, onSignInClick, onBack, ...props }, ref) => {
+    const [email, setEmail] = useState("");
+    const [password, setPassword] = useState("");
+    const [confirmPassword, setConfirmPassword] = useState("");
+    const [isLoading, setIsLoading] = useState(false);
+    const [errors, setErrors] = useState<{
+      email?: string;
+      password?: string;
+      confirmPassword?: string;
+    }>({});
+
+    // 이메일 유효성 검사
+    const validateEmail = (email: string) => {
+      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+      return emailRegex.test(email);
+    };
+
+    // 비밀번호 유효성 검사
+    const validatePassword = (password: string) => {
+      return password.length >= 8;
+    };
+
+    // 폼 제출 핸들러
+    const handleSubmit = async (e: React.FormEvent) => {
+      e.preventDefault();
+
+      // 유효성 검사
+      const newErrors: typeof errors = {};
+
+      if (!email) {
+        newErrors.email = "이메일을 입력해주세요.";
+      } else if (!validateEmail(email)) {
+        newErrors.email = "올바른 이메일 형식을 입력해주세요.";
+      }
+
+      if (!password) {
+        newErrors.password = "비밀번호를 입력해주세요.";
+      } else if (!validatePassword(password)) {
+        newErrors.password = "비밀번호는 8자 이상이어야 합니다.";
+      }
+
+      if (!confirmPassword) {
+        newErrors.confirmPassword = "비밀번호 확인을 입력해주세요.";
+      } else if (password !== confirmPassword) {
+        newErrors.confirmPassword = "비밀번호가 일치하지 않습니다.";
+      }
+
+      setErrors(newErrors);
+
+      if (Object.keys(newErrors).length > 0) {
+        return;
+      }
+
+      setIsLoading(true);
+
+      try {
+        // 가입 처리 (실제 API 호출은 나중에)
+        await new Promise((resolve) => setTimeout(resolve, 1500)); // 시뮬레이션
+        onSignUp?.(email, password);
+      } catch (error) {
+        console.error("가입 실패:", error);
+      } finally {
+        setIsLoading(false);
+      }
+    };
+
+    return (
+      <div
+        ref={ref}
+        className={cn(
+          "min-h-screen bg-gradient-to-br from-slate-50 to-blue-50 flex items-center justify-center p-4",
+          className,
+        )}
+        {...props}
+      >
+        {/* Background decoration */}
+        <div className="absolute inset-0 bg-grid-slate-100 [mask-image:linear-gradient(0deg,transparent,black)]" />
+
+        <div className="relative w-full max-w-md">
+          {/* 로고 및 헤더 */}
+          <div className="text-center mb-8">
+            <h1 className="text-3xl font-bold text-gray-900 mb-2">
+              sheetEasy AI
+            </h1>
+            <p className="text-gray-600">
+              AI 기반 Excel 편집 도구에 오신 것을 환영합니다
+            </p>
+          </div>
+
+          {/* 가입 폼 */}
+          <Card className="shadow-xl border-0 bg-white/95 backdrop-blur-sm">
+            <CardHeader className="text-center pb-6">
+              <CardTitle className="text-2xl font-semibold text-gray-900">
+                계정 만들기
+              </CardTitle>
+              <p className="text-sm text-gray-600 mt-2">
+                무료로 시작하고 AI의 힘을 경험해보세요
+              </p>
+            </CardHeader>
+
+            <CardContent className="space-y-6">
+              <form onSubmit={handleSubmit} className="space-y-4">
+                {/* 이메일 입력 */}
+                <div className="space-y-2">
+                  <label
+                    htmlFor="email"
+                    className="text-sm font-medium text-gray-700"
+                  >
+                    이메일 주소
+                  </label>
+                  <input
+                    id="email"
+                    type="email"
+                    value={email}
+                    onChange={(e) => setEmail(e.target.value)}
+                    className={cn(
+                      "w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors",
+                      errors.email ? "border-red-500" : "border-gray-300",
+                    )}
+                    placeholder="your@email.com"
+                    disabled={isLoading}
+                  />
+                  {errors.email && (
+                    <p className="text-sm text-red-600">{errors.email}</p>
+                  )}
+                </div>
+
+                {/* 비밀번호 입력 */}
+                <div className="space-y-2">
+                  <label
+                    htmlFor="password"
+                    className="text-sm font-medium text-gray-700"
+                  >
+                    비밀번호
+                  </label>
+                  <input
+                    id="password"
+                    type="password"
+                    value={password}
+                    onChange={(e) => setPassword(e.target.value)}
+                    className={cn(
+                      "w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors",
+                      errors.password ? "border-red-500" : "border-gray-300",
+                    )}
+                    placeholder="8자 이상 입력해주세요"
+                    disabled={isLoading}
+                  />
+                  {errors.password && (
+                    <p className="text-sm text-red-600">{errors.password}</p>
+                  )}
+                </div>
+
+                {/* 비밀번호 확인 */}
+                <div className="space-y-2">
+                  <label
+                    htmlFor="confirmPassword"
+                    className="text-sm font-medium text-gray-700"
+                  >
+                    비밀번호 확인
+                  </label>
+                  <input
+                    id="confirmPassword"
+                    type="password"
+                    value={confirmPassword}
+                    onChange={(e) => setConfirmPassword(e.target.value)}
+                    className={cn(
+                      "w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors",
+                      errors.confirmPassword
+                        ? "border-red-500"
+                        : "border-gray-300",
+                    )}
+                    placeholder="비밀번호를 다시 입력해주세요"
+                    disabled={isLoading}
+                  />
+                  {errors.confirmPassword && (
+                    <p className="text-sm text-red-600">
+                      {errors.confirmPassword}
+                    </p>
+                  )}
+                </div>
+
+                {/* 가입 버튼 */}
+                <Button
+                  type="submit"
+                  className="w-full bg-gradient-to-r from-green-500 to-blue-600 hover:from-green-600 hover:to-blue-700 text-white py-3 text-lg font-semibold shadow-lg hover:shadow-xl transition-all duration-300"
+                  disabled={isLoading}
+                >
+                  {isLoading ? (
+                    <div className="flex items-center justify-center">
+                      <div className="animate-spin rounded-full h-5 w-5 border-b-2 border-white mr-2"></div>
+                      계정 생성 중...
+                    </div>
+                  ) : (
+                    "무료로 시작하기"
+                  )}
+                </Button>
+              </form>
+
+              {/* 소셜 로그인 (나중에 구현) */}
+              <div className="relative">
+                <div className="absolute inset-0 flex items-center">
+                  <div className="w-full border-t border-gray-300" />
+                </div>
+                <div className="relative flex justify-center text-sm">
+                  <span className="px-2 bg-white text-gray-500">또는</span>
+                </div>
+              </div>
+
+              <div className="space-y-3">
+                <Button
+                  type="button"
+                  variant="outline"
+                  className="w-full py-3 text-gray-700 border-gray-300 hover:bg-gray-50"
+                  disabled={true} // 나중에 구현
+                >
+                  <svg className="w-5 h-5 mr-2" viewBox="0 0 24 24">
+                    <path
+                      fill="currentColor"
+                      d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
+                    />
+                    <path
+                      fill="currentColor"
+                      d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
+                    />
+                  </svg>
+                  Google로 계속하기 (준비중)
+                </Button>
+              </div>
+
+              {/* 로그인 링크 */}
+              <div className="text-center">
+                <p className="text-sm text-gray-600">
+                  이미 계정이 있으신가요?{" "}
+                  <button
+                    type="button"
+                    onClick={onSignInClick}
+                    className="text-blue-600 hover:text-blue-700 font-medium hover:underline"
+                  >
+                    로그인
+                  </button>
+                </p>
+              </div>
+            </CardContent>
+          </Card>
+
+          {/* 뒤로가기 버튼 */}
+          <div className="text-center mt-6">
+            <button
+              type="button"
+              onClick={onBack}
+              className="text-gray-600 hover:text-gray-700 text-sm hover:underline"
+            >
+              ← 메인화면으로 돌아가기
+            </button>
+          </div>
+        </div>
+      </div>
+    );
+  },
+);
+
+SignUpPage.displayName = "SignUpPage";
+
+export { SignUpPage };

src/components/sheet/EditSheetViewer.tsx

@@ -914,41 +914,28 @@ const TestSheetViewer: React.FC = () => {
 
           {/* 파일 업로드 오버레이 - 레이어 분리 */}
           {showUploadOverlay && (
-            <>
-              {/* 1. Univer CE 영역만 흐리게 하는 반투명 레이어 */}
             <div
               style={{
                 position: "absolute",
-                  top: "0px", // 헤더 높이만큼 아래로 (헤더는 약 80px)
+                top: 0,
                 left: 0,
                 right: 0,
                 bottom: 0,
                 zIndex: 40,
                 backgroundColor: "rgba(255, 255, 255, 0.01)",
                 backdropFilter: "blur(8px)",
-                  WebkitBackdropFilter: "blur(8px)", // Safari 지원
-                  pointerEvents: "auto",
-                }}
-              />
-
-              {/* 2. Univer 영역 중앙의 업로드 UI */}
-              <div
-                style={{
-                  position: "absolute",
-                  top: "-100px", // 헤더 높이만큼 아래로
-                  left: 0,
-                  right: 0,
-                  bottom: 0,
+                WebkitBackdropFilter: "blur(8px)",
                 display: "flex",
                 alignItems: "center",
                 justifyContent: "center",
-                  padding: "1rem",
-                  zIndex: 50,
+                pointerEvents: "auto",
               }}
+              onClick={() => setShowUploadOverlay(false)}
             >
               <div
                 className="max-w-2xl w-full"
                 style={{ transform: "scale(0.8)" }}
+                onClick={(e) => e.stopPropagation()}
               >
                 <div
                   className="bg-white rounded-lg shadow-xl border p-8 md:p-12"
@@ -1082,7 +1069,6 @@ const TestSheetViewer: React.FC = () => {
                 </div>
               </div>
             </div>
-            </>
           )}
 
           {/* 프롬프트 입력창 - Univer 위 오버레이 */}

src/components/ui/cta-section.tsx

@@ -1,160 +0,0 @@
-import * as React from "react";
-import { Button } from "./button";
-import { Card, CardContent } from "./card";
-import { cn } from "../../lib/utils";
-
-interface CTASectionProps {
-  className?: string;
-  onGetStarted?: () => void;
-}
-
-const CTASection = React.forwardRef<HTMLElement, CTASectionProps>(
-  ({ className, onGetStarted, ...props }, ref) => {
-    return (
-      <section
-        ref={ref}
-        className={cn(
-          "relative py-20 sm:py-32 bg-gradient-to-br from-blue-600 to-purple-700 overflow-hidden",
-          className,
-        )}
-        {...props}
-      >
-        {/* Background decoration */}
-        <div className="absolute inset-0 bg-grid-white/[0.05] [mask-image:linear-gradient(0deg,transparent,black)]" />
-
-        <div className="container relative">
-          <div className="mx-auto max-w-4xl text-center">
-            <h2 className="mb-6 text-3xl font-bold tracking-tight text-white sm:text-4xl">
-              지금 바로 시작하세요
-            </h2>
-            <p className="mx-auto mb-10 max-w-2xl text-lg leading-8 text-blue-100">
-              복잡한 Excel 작업을 AI로 간단하게. <br />
-              무료로 체험해보고 생산성을 혁신하세요.
-            </p>
-
-            {/* Pricing preview */}
-            <div className="grid grid-cols-1 md:grid-cols-3 gap-6 mb-12">
-              <Card className="border-0 bg-white/10 backdrop-blur-sm text-white">
-                <CardContent className="p-6 text-center">
-                  <h3 className="mb-2 text-xl font-semibold">Free</h3>
-                  <div className="mb-4">
-                    <span className="text-3xl font-bold">₩0</span>
-                    <span className="text-blue-200">/월</span>
-                  </div>
-                  <ul className="space-y-2 text-sm text-blue-100">
-                    <li>• AI 쿼리 30회</li>
-                    <li>• 셀 카운트 300개</li>
-                    <li>• 10MB 파일 업로드</li>
-                    <li>• 뷰어 모드만</li>
-                  </ul>
-                </CardContent>
-              </Card>
-
-              <Card className="border-2 border-yellow-400 bg-white/15 backdrop-blur-sm text-white scale-105 shadow-2xl">
-                <CardContent className="p-6 text-center relative">
-                  <div className="absolute -top-3 left-1/2 transform -translate-x-1/2 bg-yellow-400 text-gray-900 px-3 py-1 rounded-full text-xs font-semibold">
-                    추천
-                  </div>
-                  <h3 className="mb-2 text-xl font-semibold">Lite</h3>
-                  <div className="mb-4">
-                    <span className="text-3xl font-bold">₩5,900</span>
-                    <span className="text-blue-200">/월</span>
-                  </div>
-                  <ul className="space-y-2 text-sm text-blue-100">
-                    <li>• AI 쿼리 100회</li>
-                    <li>• 셀 카운트 1,000개</li>
-                    <li>• 10MB 파일 업로드</li>
-                    <li>• 다운로드/복사 가능</li>
-                  </ul>
-                </CardContent>
-              </Card>
-
-              <Card className="border-0 bg-white/10 backdrop-blur-sm text-white">
-                <CardContent className="p-6 text-center">
-                  <h3 className="mb-2 text-xl font-semibold">Pro</h3>
-                  <div className="mb-4">
-                    <span className="text-3xl font-bold">₩14,900</span>
-                    <span className="text-blue-200">/월</span>
-                  </div>
-                  <ul className="space-y-2 text-sm text-blue-100">
-                    <li>• AI 쿼리 500회</li>
-                    <li>• 셀 카운트 5,000개</li>
-                    <li>• 50MB 파일 업로드</li>
-                    <li>• 모든 기능 포함</li>
-                  </ul>
-                </CardContent>
-              </Card>
-            </div>
-
-            {/* CTA buttons */}
-            <div className="flex flex-col sm:flex-row items-center justify-center gap-4">
-              <Button
-                size="lg"
-                onClick={onGetStarted}
-                className="bg-white text-blue-600 hover:bg-gray-50 px-8 py-3 text-lg font-semibold shadow-lg hover:shadow-xl transition-all duration-300"
-                aria-label="무료로 시작하기"
-              >
-                무료로 시작하기 →
-              </Button>
-
-              <Button
-                variant="outline"
-                size="lg"
-                className="border-white text-white hover:bg-white hover:text-blue-600 px-8 py-3 text-lg font-semibold"
-                aria-label="데모 보기"
-              >
-                데모 보기
-              </Button>
-            </div>
-
-            {/* Trust indicators */}
-            <div className="mt-12 flex flex-col sm:flex-row items-center justify-center gap-8 text-blue-200">
-              <div className="flex items-center gap-2">
-                <svg
-                  className="w-5 h-5 text-yellow-400"
-                  fill="currentColor"
-                  viewBox="0 0 20 20"
-                >
-                  <path d="M9.049 2.927c.3-.921 1.603-.921 1.902 0l1.07 3.292a1 1 0 00.95.69h3.462c.969 0 1.371 1.24.588 1.81l-2.8 2.034a1 1 0 00-.364 1.118l1.07 3.292c.3.921-.755 1.688-1.54 1.118l-2.8-2.034a1 1 0 00-1.175 0l-2.8 2.034c-.784.57-1.838-.197-1.539-1.118l1.07-3.292a1 1 0 00-.364-1.118L2.98 8.72c-.783-.57-.38-1.81.588-1.81h3.461a1 1 0 00.951-.69l1.07-3.292z" />
-                </svg>
-                <span>완전 무료 시작</span>
-              </div>
-              <div className="flex items-center gap-2">
-                <svg
-                  className="w-5 h-5 text-green-400"
-                  fill="currentColor"
-                  viewBox="0 0 20 20"
-                >
-                  <path
-                    fillRule="evenodd"
-                    d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z"
-                    clipRule="evenodd"
-                  />
-                </svg>
-                <span>설치 불필요</span>
-              </div>
-              <div className="flex items-center gap-2">
-                <svg
-                  className="w-5 h-5 text-blue-400"
-                  fill="currentColor"
-                  viewBox="0 0 20 20"
-                >
-                  <path
-                    fillRule="evenodd"
-                    d="M5 9V7a5 5 0 0110 0v2a2 2 0 012 2v5a2 2 0 01-2 2H5a2 2 0 01-2-2v-5a2 2 0 012-2zm8-2v2H7V7a3 3 0 016 0z"
-                    clipRule="evenodd"
-                  />
-                </svg>
-                <span>완전 프라이버시</span>
-              </div>
-            </div>
-          </div>
-        </div>
-      </section>
-    );
-  },
-);
-
-CTASection.displayName = "CTASection";
-
-export { CTASection };

src/components/ui/faq-section.tsx

@@ -0,0 +1,122 @@
+import * as React from "react";
+import { Card, CardContent } from "./card";
+import { cn } from "../../lib/utils";
+
+interface FAQSectionProps {
+  className?: string;
+}
+
+const FAQSection = React.forwardRef<HTMLElement, FAQSectionProps>(
+  ({ className, ...props }, ref) => {
+    const [openIndex, setOpenIndex] = React.useState<number | null>(null);
+
+    const faqs = [
+      {
+        question: "sheetEasy AI는 어떤 서비스인가요?",
+        answer:
+          "AI 기반 Excel 편집 도구로, 자연어 명령으로 수식, 차트, 데이터 분석을 자동 생성합니다. 모든 처리는 브라우저에서 안전하게 이루어집니다.",
+      },
+      {
+        question: "파일이 서버로 전송되나요?",
+        answer:
+          "아니요! 모든 파일 처리는 브라우저에서 로컬로 이루어집니다. 귀하의 데이터는 외부로 전송되지 않아 완전한 프라이버시를 보장합니다.",
+      },
+      {
+        question: "어떤 파일 형식을 지원하나요?",
+        answer:
+          "Excel(.xlsx, .xls)과 CSV 파일을 지원합니다. 업로드된 파일은 자동으로 최적화되어 처리됩니다.",
+      },
+      {
+        question: "AI 기능은 어떻게 작동하나요?",
+        answer:
+          "GPT-4, Claude 등 최신 AI 모델을 활용하여 자연어 명령을 Excel 수식과 차트로 변환합니다. '매출 상위 10개 항목 강조해줘' 같은 명령으로 쉽게 사용할 수 있습니다.",
+      },
+      {
+        question: "무료 플랜의 제한사항은 무엇인가요?",
+        answer:
+          "무료 플랜은 월 30회 AI 쿼리, 300개 셀 편집, 10MB 파일 크기 제한이 있습니다. 다운로드와 복사는 제한됩니다.",
+      },
+      {
+        question: "데이터는 안전하게 보호되나요?",
+        answer:
+          "네! 모든 데이터는 브라우저에서만 처리되며, 서버 전송 없이 완전한 로컬 처리로 최고 수준의 보안을 제공합니다.",
+      },
+    ];
+
+    const toggleFAQ = (index: number) => {
+      setOpenIndex(openIndex === index ? null : index);
+    };
+
+    return (
+      <section
+        ref={ref}
+        id="faq"
+        className={cn("py-20 sm:py-32 bg-gray-50", className)}
+        {...props}
+      >
+        <div className="container">
+          <div className="mx-auto max-w-4xl">
+            {/* Section Header */}
+            <div className="text-center mb-16">
+              <h2 className="text-3xl font-bold tracking-tight text-gray-900 sm:text-4xl mb-4">
+                자주 묻는 질문
+              </h2>
+              <p className="text-lg text-gray-600">
+                sheetEasy AI에 대해 궁금한 점을 해결해 드립니다
+              </p>
+            </div>
+
+            {/* FAQ Items */}
+            <div className="space-y-4">
+              {faqs.map((faq, index) => (
+                <Card key={index} className="border border-gray-200 shadow-sm">
+                  <CardContent className="p-0">
+                    <button
+                      onClick={() => toggleFAQ(index)}
+                      className="w-full text-left p-6 focus:outline-none focus:ring-2 focus:ring-green-500 focus:ring-inset"
+                    >
+                      <div className="flex items-center justify-between">
+                        <h3 className="text-lg font-semibold text-gray-900">
+                          {faq.question}
+                        </h3>
+                        <div className="ml-6 flex-shrink-0">
+                          <svg
+                            className={cn(
+                              "h-5 w-5 text-gray-500 transition-transform duration-200",
+                              openIndex === index ? "rotate-180" : "",
+                            )}
+                            fill="none"
+                            stroke="currentColor"
+                            viewBox="0 0 24 24"
+                          >
+                            <path
+                              strokeLinecap="round"
+                              strokeLinejoin="round"
+                              strokeWidth={2}
+                              d="M19 9l-7 7-7-7"
+                            />
+                          </svg>
+                        </div>
+                      </div>
+                    </button>
+                    {openIndex === index && (
+                      <div className="px-6 pb-6">
+                        <p className="text-gray-600 leading-relaxed">
+                          {faq.answer}
+                        </p>
+                      </div>
+                    )}
+                  </CardContent>
+                </Card>
+              ))}
+            </div>
+          </div>
+        </div>
+      </section>
+    );
+  },
+);
+
+FAQSection.displayName = "FAQSection";
+
+export { FAQSection };

src/components/ui/features-section.tsx

@@ -74,6 +74,7 @@ const FeaturesSection = React.forwardRef<HTMLElement, FeaturesSectionProps>(
     return (
       <section
         ref={ref}
+        id="features"
         className={cn("py-20 sm:py-32 bg-white", className)}
         {...props}
       >
@@ -92,28 +93,36 @@ const FeaturesSection = React.forwardRef<HTMLElement, FeaturesSectionProps>(
             {features.map((feature, index) => (
               <Card
                 key={index}
-                className="border-0 shadow-lg hover:shadow-xl transition-all duration-300 hover:-translate-y-1 bg-gradient-to-br from-white to-gray-50"
+                className="group border-0 shadow-lg hover:shadow-2xl transition-all duration-500 hover:-translate-y-2 bg-gradient-to-br from-white to-gray-50 hover:from-blue-50 hover:to-purple-50 cursor-pointer overflow-hidden relative"
               >
-                <CardHeader className="pb-4">
-                  <div className="mb-4 inline-flex h-12 w-12 items-center justify-center rounded-xl bg-gradient-to-r from-blue-500 to-purple-600">
-                    <span className="text-2xl">{feature.icon}</span>
+                {/* Hover 효과를 위한 배경 그라데이션 */}
+                <div className="absolute inset-0 bg-gradient-to-r from-blue-500/5 to-purple-500/5 opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+
+                <CardHeader className="pb-4 relative z-10">
+                  <div className="mb-4 inline-flex h-12 w-12 items-center justify-center rounded-xl bg-gradient-to-r from-blue-500 to-purple-600 group-hover:scale-110 group-hover:from-blue-600 group-hover:to-purple-700 transition-all duration-300 shadow-md group-hover:shadow-lg">
+                    <span className="text-2xl group-hover:scale-110 transition-transform duration-300">
+                      {feature.icon}
+                    </span>
                   </div>
-                  <CardTitle className="text-xl font-semibold text-gray-900">
+                  <CardTitle className="text-xl font-semibold text-gray-900 group-hover:text-blue-700 transition-colors duration-300">
                     {feature.title}
                   </CardTitle>
                 </CardHeader>
-                <CardContent className="pt-0">
-                  <p className="text-gray-600 mb-4 leading-relaxed">
+                <CardContent className="pt-0 relative z-10">
+                  <p className="text-gray-600 group-hover:text-gray-700 mb-4 leading-relaxed transition-colors duration-300">
                     {feature.description}
                   </p>
                   <ul className="space-y-2">
                     {feature.highlights.map((highlight, highlightIndex) => (
                       <li
                         key={highlightIndex}
-                        className="flex items-start text-sm text-gray-700"
+                        className="flex items-start text-sm text-gray-700 group-hover:text-gray-800 transition-colors duration-300"
+                        style={{
+                          animationDelay: `${highlightIndex * 100}ms`,
+                        }}
                       >
                         <svg
-                          className="mr-2 mt-0.5 h-4 w-4 text-green-500 flex-shrink-0"
+                          className="mr-2 mt-0.5 h-4 w-4 text-green-500 group-hover:text-green-600 flex-shrink-0 transition-colors duration-300 group-hover:scale-110"
                           fill="currentColor"
                           viewBox="0 0 20 20"
                         >
@@ -123,7 +132,9 @@ const FeaturesSection = React.forwardRef<HTMLElement, FeaturesSectionProps>(
                             clipRule="evenodd"
                           />
                         </svg>
+                        <span className="group-hover:translate-x-1 transition-transform duration-300">
                           {highlight}
+                        </span>
                       </li>
                     ))}
                   </ul>

src/components/ui/hero-section.tsx

@@ -6,13 +6,15 @@ import { cn } from "../../lib/utils";
 interface HeroSectionProps {
   className?: string;
   onGetStarted?: () => void;
+  onDemoClick?: () => void;
 }
 
 const HeroSection = React.forwardRef<HTMLElement, HeroSectionProps>(
-  ({ className, onGetStarted, ...props }, ref) => {
+  ({ className, onGetStarted, onDemoClick, ...props }, ref) => {
     return (
       <section
         ref={ref}
+        id="home"
         className={cn(
           "relative overflow-hidden bg-gradient-to-br from-slate-50 to-blue-50 py-20 sm:py-32",
           className,
@@ -61,10 +63,11 @@ const HeroSection = React.forwardRef<HTMLElement, HeroSectionProps>(
               <Button
                 variant="outline"
                 size="lg"
+                onClick={onDemoClick}
                 className="px-8 py-3 text-lg font-semibold"
-                aria-label="기능 둘러보기"
+                aria-label="데모보기"
               >
-                기능 둘러보기
+                데모보기
               </Button>
             </div>
 

src/components/ui/historyPanel.tsx

@@ -120,9 +120,9 @@ const HistoryPanel: React.FC<HistoryPanelProps> = ({
         )}
         style={{
           position: "fixed",
-          top: 65,
+          top: 64, // App.tsx 헤더와 일치 (h-16 = 64px)
           right: 0,
-          height: "100vh",
+          height: "calc(100vh - 64px)", // 헤더 높이만큼 조정
           width: "384px", // w-96 = 384px
           backgroundColor: "#ffffff",
           zIndex: 50,

src/components/ui/pricing-section.tsx

@@ -0,0 +1,207 @@
+import * as React from "react";
+import { Button } from "./button";
+import { Card, CardContent } from "./card";
+import { cn } from "../../lib/utils";
+
+interface PricingSectionProps {
+  className?: string;
+  onGetStarted?: () => void;
+}
+
+const PricingSection = React.forwardRef<HTMLElement, PricingSectionProps>(
+  ({ className, onGetStarted, ...props }, ref) => {
+    const plans = [
+      {
+        name: "Free",
+        price: "0원",
+        period: "월",
+        description: "개인 사용자를 위한 무료 플랜",
+        features: [
+          "월 30회 AI 쿼리",
+          "300개 셀 편집",
+          "10MB 파일 크기 제한",
+          "다운로드 불가",
+          "복사 불가",
+        ],
+        buttonText: "무료로 시작하기",
+        buttonVariant: "outline" as const,
+        popular: false,
+      },
+      {
+        name: "Lite",
+        price: "5,900원",
+        period: "월",
+        description: "소규모 팀을 위한 기본 플랜",
+        features: [
+          "월 100회 AI 쿼리",
+          "1,000개 셀 편집",
+          "10MB 파일 크기 제한",
+          "다운로드 가능",
+          "복사 가능",
+        ],
+        buttonText: "Lite 시작하기",
+        buttonVariant: "default" as const,
+        popular: true,
+      },
+      {
+        name: "Pro",
+        price: "14,900원",
+        period: "월",
+        description: "전문가를 위한 고급 플랜",
+        features: [
+          "월 500회 AI 쿼리",
+          "5,000개 셀 편집",
+          "50MB 파일 크기 제한",
+          "다운로드 가능",
+          "복사 가능",
+        ],
+        buttonText: "Pro 시작하기",
+        buttonVariant: "outline" as const,
+        popular: false,
+      },
+      {
+        name: "Enterprise",
+        price: "협의",
+        period: "",
+        description: "대기업을 위한 맞춤형 플랜",
+        features: [
+          "무제한 AI 쿼리",
+          "무제한 셀 편집",
+          "무제한 파일 크기",
+          "다운로드 가능",
+          "복사 가능",
+        ],
+        buttonText: "문의하기",
+        buttonVariant: "outline" as const,
+        popular: false,
+      },
+    ];
+
+    return (
+      <section
+        ref={ref}
+        id="pricing"
+        className={cn(
+          "relative py-20 sm:py-32 bg-gradient-to-br from-blue-600 to-purple-700 overflow-hidden",
+          className,
+        )}
+        {...props}
+      >
+        {/* Background decoration */}
+        <div className="absolute inset-0 bg-grid-white/[0.05] [mask-image:linear-gradient(0deg,transparent,black)]" />
+
+        <div className="container relative">
+          <div className="mx-auto max-w-6xl">
+            {/* Section Header */}
+            <div className="text-center mb-16">
+              <h2 className="text-3xl font-bold tracking-tight text-white sm:text-4xl mb-4">
+                심플하고 투명한 가격
+              </h2>
+              <p className="text-lg text-blue-100">
+                모든 기능을 제한 없이 사용하세요
+              </p>
+            </div>
+
+            {/* Pricing Cards */}
+            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-8">
+              {plans.map((plan, index) => (
+                <Card
+                  key={index}
+                  className={cn(
+                    "relative shadow-lg hover:shadow-xl transition-all duration-300 bg-white/10 backdrop-blur-sm text-white",
+                    plan.popular
+                      ? "border-2 border-yellow-400 scale-105 shadow-2xl bg-white/15"
+                      : "border-0",
+                  )}
+                >
+                  {plan.popular && (
+                    <div className="absolute -top-3 left-1/2 transform -translate-x-1/2">
+                      <span className="bg-yellow-400 text-gray-900 px-4 py-1 rounded-full text-sm font-medium">
+                        인기
+                      </span>
+                    </div>
+                  )}
+
+                  <CardContent className="p-6">
+                    {/* Plan Header */}
+                    <div className="text-center mb-6">
+                      <h3 className="text-xl font-bold text-white mb-2">
+                        {plan.name}
+                      </h3>
+                      <div className="mb-2">
+                        <span className="text-3xl font-bold text-white">
+                          {plan.price}
+                        </span>
+                        {plan.period && (
+                          <span className="text-blue-200">/{plan.period}</span>
+                        )}
+                      </div>
+                      <p className="text-sm text-blue-100">
+                        {plan.description}
+                      </p>
+                    </div>
+
+                    {/* Features */}
+                    <div className="mb-8">
+                      <ul className="space-y-3">
+                        {plan.features.map((feature, featureIndex) => (
+                          <li key={featureIndex} className="flex items-start">
+                            <div className="flex-shrink-0 mr-3 mt-1">
+                              <svg
+                                className="h-4 w-4 text-yellow-400"
+                                fill="none"
+                                stroke="currentColor"
+                                viewBox="0 0 24 24"
+                              >
+                                <path
+                                  strokeLinecap="round"
+                                  strokeLinejoin="round"
+                                  strokeWidth={2}
+                                  d="M5 13l4 4L19 7"
+                                />
+                              </svg>
+                            </div>
+                            <span className="text-sm text-blue-100">
+                              {feature}
+                            </span>
+                          </li>
+                        ))}
+                      </ul>
+                    </div>
+
+                    {/* CTA Button */}
+                    <Button
+                      variant={plan.buttonVariant}
+                      className={cn(
+                        "w-full",
+                        plan.popular
+                          ? "bg-yellow-400 hover:bg-yellow-500 text-gray-900 font-semibold"
+                          : "bg-white/20 hover:bg-white/30 text-white border-white/30",
+                      )}
+                      onClick={onGetStarted}
+                    >
+                      {plan.buttonText}
+                    </Button>
+                  </CardContent>
+                </Card>
+              ))}
+            </div>
+
+            {/* Additional Info */}
+            <div className="mt-12 text-center">
+              <p className="text-sm text-blue-200">
+                • 모든 플랜은 언제든지 취소 가능합니다 • AI 쿼리 또는 셀 카운트
+                중 하나라도 도달하면 제한됩니다 • 결제는 한국 원화(KRW)로
+                진행됩니다
+              </p>
+            </div>
+          </div>
+        </div>
+      </section>
+    );
+  },
+);
+
+PricingSection.displayName = "PricingSection";
+
+export { PricingSection };

src/components/ui/topbar.tsx

@@ -1,15 +1,81 @@
 import * as React from "react";
 import { Button } from "./button";
 import { cn } from "../../lib/utils";
+import { useAppStore } from "../../stores/useAppStore";
 
 interface TopBarProps {
   className?: string;
   onDownloadClick?: () => void;
   onAccountClick?: () => void;
+  onSignInClick?: () => void;
+  onGetStartedClick?: () => void;
+  onLogoClick?: () => void;
+  showDownload?: boolean;
+  showAccount?: boolean;
+  showNavigation?: boolean;
+  showAuthButtons?: boolean;
 }
 
 const TopBar = React.forwardRef<HTMLElement, TopBarProps>(
-  ({ className, onDownloadClick, onAccountClick, ...props }, ref) => {
+  (
+    {
+      className,
+      onDownloadClick,
+      onAccountClick,
+      onSignInClick,
+      onGetStartedClick,
+      onLogoClick,
+      showDownload = true,
+      showAccount = true,
+      showNavigation = false,
+      showAuthButtons = false,
+      ...props
+    },
+    ref,
+  ) => {
+    const { currentFile, user, isAuthenticated } = useAppStore();
+
+    // 기본 다운로드 핸들러 - 현재 파일을 XLSX로 다운로드
+    const handleDownload = () => {
+      if (onDownloadClick) {
+        onDownloadClick();
+      } else if (currentFile?.xlsxBuffer) {
+        // XLSX ArrayBuffer를 Blob으로 변환하여 다운로드
+        const blob = new Blob([currentFile.xlsxBuffer], {
+          type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        });
+        const url = URL.createObjectURL(blob);
+        const link = document.createElement("a");
+        link.href = url;
+        link.download = currentFile.name || "sheet.xlsx";
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+        URL.revokeObjectURL(url);
+      } else {
+        alert("다운로드할 파일이 없습니다. 파일을 먼저 업로드해주세요.");
+      }
+    };
+
+    // 기본 계정 핸들러
+    const handleAccount = () => {
+      if (onAccountClick) {
+        onAccountClick();
+      } else {
+        // 기본 동작 - 계정 페이지로 이동 (추후 구현)
+        console.log("계정 페이지로 이동");
+      }
+    };
+
+    // 네비게이션 메뉴 핸들러들
+    const handleNavigation = (section: string) => {
+      // 랜딩 페이지의 해당 섹션으로 스크롤
+      const element = document.getElementById(section);
+      if (element) {
+        element.scrollIntoView({ behavior: "smooth" });
+      }
+    };
+
     return (
       <header
         ref={ref}
@@ -22,24 +88,82 @@ const TopBar = React.forwardRef<HTMLElement, TopBarProps>(
         <div className="container flex h-16 items-center justify-between">
           {/* Logo */}
           <div className="flex items-center">
-            <div className="flex items-center space-x-2">
+            <button
+              className="flex items-center space-x-2 hover:opacity-80 transition-opacity"
+              onClick={onLogoClick}
+              aria-label="홈으로 이동"
+            >
               <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-gradient-to-r from-green-500 to-blue-600">
                 <span className="text-sm font-bold text-white">📊</span>
               </div>
               <span className="text-xl font-bold bg-gradient-to-r from-green-600 to-blue-600 bg-clip-text text-transparent">
                 sheetEasy AI
               </span>
+            </button>
           </div>
-          </div>
+
+          {/* Navigation Menu - Vooster.ai 스타일 */}
+          {showNavigation && (
+            <nav className="hidden md:flex items-center space-x-8">
+              <button
+                onClick={() => handleNavigation("home")}
+                className="text-sm font-medium text-gray-700 hover:text-green-600 transition-colors"
+              >
+                홈
+              </button>
+              <button
+                onClick={() => handleNavigation("features")}
+                className="text-sm font-medium text-gray-700 hover:text-green-600 transition-colors"
+              >
+                기능소개
+              </button>
+              <button
+                onClick={() => handleNavigation("faq")}
+                className="text-sm font-medium text-gray-700 hover:text-green-600 transition-colors"
+              >
+                FAQ
+              </button>
+              <button
+                onClick={() => handleNavigation("pricing")}
+                className="text-sm font-medium text-gray-700 hover:text-green-600 transition-colors"
+              >
+                가격
+              </button>
+            </nav>
+          )}
 
           {/* Actions */}
           <div className="flex items-center space-x-4">
+            {/* Auth Buttons - 랜딩 페이지용 */}
+            {showAuthButtons && (
+              <>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={onSignInClick}
+                  className="hidden sm:inline-flex text-gray-700 hover:text-green-600"
+                >
+                  로그인
+                </Button>
+                <Button
+                  size="sm"
+                  onClick={onGetStartedClick}
+                  className="bg-green-600 hover:bg-green-700 text-white"
+                >
+                  무료로 시작하기
+                </Button>
+              </>
+            )}
+
+            {/* Download 버튼 - 에디터용 */}
+            {showDownload && (
               <Button
                 variant="outline"
                 size="sm"
-              onClick={onDownloadClick}
-              className="hidden sm:inline-flex"
+                onClick={handleDownload}
+                className="hidden sm:inline-flex hover:bg-green-50 hover:border-green-300"
                 aria-label="파일 다운로드"
+                disabled={!currentFile?.xlsxBuffer}
               >
                 <svg
                   className="mr-2 h-4 w-4"
@@ -55,23 +179,53 @@ const TopBar = React.forwardRef<HTMLElement, TopBarProps>(
                     d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"
                   />
                 </svg>
-              Download
+                다운로드
               </Button>
+            )}
 
+            {/* Account 버튼 - 로그인 시 */}
+            {showAccount && isAuthenticated && (
               <Button
                 variant="ghost"
                 size="sm"
-              onClick={onAccountClick}
-              className="flex items-center space-x-2"
+                onClick={handleAccount}
+                className="flex items-center space-x-2 hover:bg-purple-50"
                 aria-label="계정 설정"
               >
                 <div className="h-8 w-8 rounded-full bg-gradient-to-r from-purple-500 to-pink-500 flex items-center justify-center">
-                <span className="text-xs font-medium text-white">User</span>
+                  <span className="text-xs font-medium text-white">
+                    {user?.name?.charAt(0).toUpperCase() || "U"}
+                  </span>
                 </div>
                 <span className="hidden sm:inline-block text-sm font-medium">
-                Account
+                  {user?.name || "계정"}
                 </span>
               </Button>
+            )}
+
+            {/* Mobile Menu Button - 모바일용 */}
+            {showNavigation && (
+              <Button
+                variant="ghost"
+                size="sm"
+                className="md:hidden"
+                aria-label="메뉴 열기"
+              >
+                <svg
+                  className="h-5 w-5"
+                  fill="none"
+                  stroke="currentColor"
+                  viewBox="0 0 24 24"
+                >
+                  <path
+                    strokeLinecap="round"
+                    strokeLinejoin="round"
+                    strokeWidth={2}
+                    d="M4 6h16M4 12h16M4 18h16"
+                  />
+                </svg>
+              </Button>
+            )}
           </div>
         </div>
       </header>