diff --git a/src/app/(auth)/layout.tsx b/src/app/(auth)/layout.tsx
index 9143d65..a0ace31 100644
--- a/src/app/(auth)/layout.tsx
+++ b/src/app/(auth)/layout.tsx
@@ -1,3 +1,11 @@
+import { makePageMetadata } from "@/seo/metadata";
+
+export const metadata = makePageMetadata({
+  title: "PlanMate — 로그인/회원가입",
+  description: "PlanMate 계정으로 로그인하거나 회원가입하세요.",
+  canonical: "/login",
+});
+
 export default function AuthLayout({ children }: { children: React.ReactNode }) {
   return <>{children}</>;
 }
diff --git a/src/app/(marketing)/layout.tsx b/src/app/(marketing)/layout.tsx
index 9c9b387..cc3fb32 100644
--- a/src/app/(marketing)/layout.tsx
+++ b/src/app/(marketing)/layout.tsx
@@ -1,3 +1,11 @@
+import { makePageMetadata } from "@/seo/metadata";
+
+export const metadata = makePageMetadata({
+  title: "PlanMate — 맞춤형 데일리 플래너",
+  description: "원하는 모듈을 조합해 나만의 플래너를 만드는 PlanMate 랜딩 페이지",
+  canonical: "/",
+});
+
 export default function MarketingLayout({ children }: { children: React.ReactNode }) {
   return <>{children}</>;
 }
diff --git a/src/app/(marketing)/page.tsx b/src/app/(marketing)/page.tsx
index 8ea7063..3b4885c 100644
--- a/src/app/(marketing)/page.tsx
+++ b/src/app/(marketing)/page.tsx
@@ -1,16 +1,17 @@
-import { makePageMetadata } from "@/seo/metadata";
+"use client";
+
 import { Button } from "@/shared/button";
 import { FeatureGroupButton } from "@/shared/feature-group-button";
+import { Input } from "@/shared/input";
 import { SpecialFeatureCard } from "@/shared/SpecialFeatureCard";
+import { InputStatus } from "@/types/input";
 import { Calendar, Laptop, Monitor, Smartphone } from "lucide-react";
-
-export const metadata = makePageMetadata({
-  title: "PlanMate — 맞춤형 데일리 플래너",
-  description: "원하는 모듈을 조합해 나만의 플래너를 만드는 PlanMate 랜딩 페이지",
-  canonical: "/",
-});
+import { useState } from "react";
 
 export default function Home() {
+  const [email, setEmail] = useState("");
+  const [status, setStatus] = useState<InputStatus>("default");
+
   return (
     <div className="flex flex-col justify-center items-center gap-8">
       {/* Hero CTA */}
@@ -50,6 +51,53 @@ export default function Home() {
       <Button preset="auth" color="black">
         로그인 하기
       </Button>
+
+      <section className="space-y-2">
+        <h2 className="t-18-b">에러 상태</h2>
+        <div className="space-y-1">
+          <label htmlFor="email" className="t-14-m text-muted-foreground">
+            이메일
+          </label>
+
+          {/** status: "default" | "error" */}
+          <Input
+            id="email"
+            type="email"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            status={status} // ✅ cva와 1:1
+            placeholder="이메일을 입력하세요"
+            aria-describedby={status === "error" ? "email-error" : undefined}
+            onFocus={() => setStatus("default")}
+          />
+
+          {status === "error" && (
+            <p id="email-error" className="t-12-m text-destructive">
+              이메일 형식을 확인하세요.
+            </p>
+          )}
+
+          <div className="flex gap-2 pt-2">
+            <button
+              type="button"
+              onClick={() => setStatus((v: InputStatus) => (v === "error" ? "default" : "error"))}
+              className="rounded-md border px-3 py-1 text-sm"
+            >
+              에러 토글
+            </button>
+            <button
+              type="button"
+              onClick={() => {
+                setEmail("");
+                setStatus("default");
+              }}
+              className="rounded-md border px-3 py-1 text-sm"
+            >
+              값 초기화
+            </button>
+          </div>
+        </div>
+      </section>
     </div>
   );
 }
diff --git a/src/app/(setup)/layout.tsx b/src/app/(setup)/layout.tsx
index e15c360..8eb0fcd 100644
--- a/src/app/(setup)/layout.tsx
+++ b/src/app/(setup)/layout.tsx
@@ -1,3 +1,11 @@
+import { makePageMetadata } from "@/seo/metadata";
+
+export const metadata = makePageMetadata({
+  title: "초기 설정 — MyPlanMate",
+  description: "모듈을 선택하고 배치해 나만의 플래너를 시작하세요.",
+  canonical: "/setup",
+});
+
 export default function SetupLayout({ children }: { children: React.ReactNode }) {
   return <>{children}</>;
 }
diff --git a/src/app/planner/layout.tsx b/src/app/planner/layout.tsx
index b15beaf..6d35fae 100644
--- a/src/app/planner/layout.tsx
+++ b/src/app/planner/layout.tsx
@@ -1,3 +1,14 @@
+import { makePageMetadata } from "@/seo/metadata";
+
+export const metadata = {
+  ...makePageMetadata({
+    title: "플래너",
+    description: "PlanMate 플래너 대시보드",
+    canonical: "/planner",
+  }),
+  robots: { index: false, follow: false }, // 보호 구역은 검색 제외
+};
+
 export default function PlannerLayout({ children }: { children: React.ReactNode }) {
   return <>{children}</>;
 }
diff --git a/src/app/planner/page.tsx b/src/app/planner/page.tsx
index 36904ea..897bf32 100644
--- a/src/app/planner/page.tsx
+++ b/src/app/planner/page.tsx
@@ -1,14 +1,3 @@
-import { makePageMetadata } from "@/seo/metadata";
-
-export const metadata = {
-  ...makePageMetadata({
-    title: "플래너",
-    description: "PlanMate 플래너 대시보드",
-    canonical: "/planner",
-  }),
-  robots: { index: false, follow: false }, // 보호 구역은 검색 제외
-};
-
 export default function PlannerPage() {
   return <div>플래너 대시보드</div>;
 }
diff --git a/src/lib/variants/input.auth.ts b/src/lib/variants/input.auth.ts
new file mode 100644
index 0000000..11dd7c0
--- /dev/null
+++ b/src/lib/variants/input.auth.ts
@@ -0,0 +1,47 @@
+// src/lib/variants/input.auth.ts
+import { cva, type VariantProps } from "class-variance-authority";
+
+/**
+ * 로그인 인풋 컴포넌트의 스타일 variant
+ * - 기본: 1px + gray-300
+ * - 포커스: 1.5px + gray-900
+ * - 에러: 1.5px + danger-600
+ * - 에러 상태에서 포커스 시: 포커스 규칙(gray-900)로 복귀
+ */
+export const authInputVariants = cva(
+  [
+    // === 기본 레이아웃 ===
+    "w-[36.6rem] h-[4.6rem] px-6 rounded-lg bg-white t-14-m outline-none",
+
+    // === 플레이스홀더 ===
+    "placeholder:text-[var(--color-gray-500)]",
+
+    // === 기본 테두리 (1px + gray-300) ===
+    "border-[1.5px] border-[color:var(--color-gray-300)]",
+
+    // === 포커스 (1.5px + gray-900) ===
+    "focus:border-[2px] focus:border-[color:var(--color-gray-900)]",
+
+    // === 전환 효과 ===
+    "transition-colors duration-150",
+  ].join(" "),
+  {
+    variants: {
+      status: {
+        default: "",
+
+        error: [
+          "border-[2px]",
+          "border-[color:var(--color-danger-600)]",
+          "focus:border-[2px]",
+          "focus:border-[color:var(--color-gray-900)]",
+        ].join(" "),
+      },
+    },
+    defaultVariants: {
+      status: "default",
+    },
+  },
+);
+
+export type AuthInputVariants = VariantProps<typeof authInputVariants>;
diff --git a/src/shared/input.tsx b/src/shared/input.tsx
index 5816d96..ae9ea45 100644
--- a/src/shared/input.tsx
+++ b/src/shared/input.tsx
@@ -1,33 +1,47 @@
+"use client";
+
 import { cn } from "@/lib/utils";
+import { authInputVariants } from "@/lib/variants/input.auth";
+import type { InputProps } from "@/types/input";
 import * as React from "react";
 
-function Input({ className, type, ...props }: React.ComponentProps<"input">) {
+/**
+ * AuthInput — 기본/포커스/에러 상태
+ * - status: "default" | "error"
+ * - 에러 상태에서 포커스 시 자동으로 기본 상태로 복귀
+ */
+export const Input = React.forwardRef<
+  HTMLInputElement,
+  React.ComponentPropsWithoutRef<"input"> & InputProps
+>(({ className, status = "default", ...rest }, ref) => {
+  const [currentStatus, setCurrentStatus] = React.useState<InputProps["status"]>(status);
+
+  // 외부에서 status가 바뀌면 동기화
+  React.useEffect(() => {
+    setCurrentStatus(status);
+  }, [status]);
+
+  // 포커스 시 에러 상태면 기본으로 복귀
+  const handleFocus = (e: React.FocusEvent<HTMLInputElement>) => {
+    if (currentStatus === "error") setCurrentStatus("default");
+    rest.onFocus?.(e);
+  };
+
+  const handleBlur = (e: React.FocusEvent<HTMLInputElement>) => {
+    rest.onBlur?.(e);
+  };
+
   return (
     <input
-      type={type}
-      data-slot="input"
-      className={cn(
-        // 크기/레이아웃
-        "h-12 w-full min-w-0 rounded-md px-3 py-2 text-sm outline-none transition-colors",
-        // 기본 텍스트/배경
-        "bg-white text-[#111827]",
-        // 기본 테두리(1px, 회색)
-        "border border-[var(--color-gray-300)]",
-        // 플레이스홀더
-        "placeholder:text-[#737373]",
-        // ✅ 포커스(활성화): 테두리 두께↑(2px) + 색상 #111827
-        "focus-visible:border-2 focus-visible:border-[#111827]",
-        // 에러(접근성): aria-invalid=true → 테두리 #dc2626
-        "aria-invalid:border-[#dc2626]",
-        // 비활성
-        "disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
-        // file input 기본값(필요 시)
-        "file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground",
-        className,
-      )}
-      {...props}
+      ref={ref}
+      onFocus={handleFocus}
+      onBlur={handleBlur}
+      className={cn(authInputVariants({ status: currentStatus }), className)}
+      aria-invalid={currentStatus === "error" ? "true" : "false"}
+      data-invalid={currentStatus === "error" ? "true" : "false"}
+      {...rest}
     />
   );
-}
+});
 
-export { Input };
+Input.displayName = "Input";
diff --git a/src/types/input.ts b/src/types/input.ts
new file mode 100644
index 0000000..33f4c22
--- /dev/null
+++ b/src/types/input.ts
@@ -0,0 +1,10 @@
+export type InputStatus = "default" | "error";
+
+/** 스타일 상태 Props */
+export interface InputStateProps {
+  /** 인풋 상태 — 기본(default) 또는 에러(error) */
+  status?: InputStatus;
+}
+
+/** 최종 컴포넌트 Props */
+export type InputProps = InputStateProps;