diff --git a/frontend/app/(auth)/login/page.tsx b/frontend/app/(auth)/login/page.tsx
index 2910951e..62e48e08 100644
--- a/frontend/app/(auth)/login/page.tsx
+++ b/frontend/app/(auth)/login/page.tsx
@@ -5,23 +5,13 @@ import { LoginHeader } from "@/components/auth/LoginHeader";
 import { LoginForm } from "@/components/auth/LoginForm";
 import { LoginFooter } from "@/components/auth/LoginFooter";
 
-/**
- * 로그인 페이지 컴포넌트
- * 비즈니스 로직은 useLogin 훅에서 처리하고, UI 컴포넌트들을 조합하여 구성
- */
 export default function LoginPage() {
   const { formData, isLoading, error, showPassword, handleInputChange, handleLogin, togglePasswordVisibility } =
     useLogin();
 
   return (
-    <div className="relative flex min-h-screen items-center justify-center bg-gradient-to-br from-background to-muted p-4">
-      {/* 배경 장식 원 */}
-      <div className="absolute inset-0 overflow-hidden">
-        <div className="absolute -top-40 -right-40 h-80 w-80 rounded-full bg-primary/5" />
-        <div className="absolute -bottom-40 -left-40 h-80 w-80 rounded-full bg-primary/5" />
-      </div>
-
-      <div className="relative w-full max-w-md space-y-8">
+    <div className="flex min-h-screen flex-col items-center justify-center bg-muted/40 p-4">
+      <div className="w-full max-w-md space-y-6">
         <LoginHeader />
 
         <LoginForm
diff --git a/frontend/app/(main)/page.tsx b/frontend/app/(main)/page.tsx
index befdf90e..906d74b9 100644
--- a/frontend/app/(main)/page.tsx
+++ b/frontend/app/(main)/page.tsx
@@ -2,15 +2,15 @@
 
 import { useRouter } from "next/navigation";
 import { useAuth } from "@/hooks/useAuth";
-import { FileCheck, Menu, Users, Bell, FileText, Layout, Server, Shield, Calendar } from "lucide-react";
+import { FileCheck, Menu, Users, Bell, FileText, Layout, Server, Shield, Calendar, ArrowRight } from "lucide-react";
 
 const quickAccessItems = [
-  { label: "결재함", icon: FileCheck, href: "/admin/approvalBox" },
-  { label: "메뉴 관리", icon: Menu, href: "/admin/menu" },
-  { label: "사용자 관리", icon: Users, href: "/admin/userMng" },
-  { label: "공지사항", icon: Bell, href: "/admin/system-notices" },
-  { label: "감사 로그", icon: FileText, href: "/admin/audit-log" },
-  { label: "화면 관리", icon: Layout, href: "/admin/screenMng" },
+  { label: "결재함", icon: FileCheck, href: "/admin/approvalBox", color: "text-blue-600 bg-blue-50" },
+  { label: "메뉴 관리", icon: Menu, href: "/admin/menu", color: "text-violet-600 bg-violet-50" },
+  { label: "사용자 관리", icon: Users, href: "/admin/userMng", color: "text-emerald-600 bg-emerald-50" },
+  { label: "공지사항", icon: Bell, href: "/admin/system-notices", color: "text-amber-600 bg-amber-50" },
+  { label: "감사 로그", icon: FileText, href: "/admin/audit-log", color: "text-rose-600 bg-rose-50" },
+  { label: "화면 관리", icon: Layout, href: "/admin/screenMng", color: "text-cyan-600 bg-cyan-50" },
 ];
 
 export default function MainHomePage() {
@@ -18,35 +18,35 @@ export default function MainHomePage() {
   const { user } = useAuth();
 
   const userName = user?.userName || "사용자";
+  const today = new Date();
+  const dateStr = today.toLocaleDateString("ko-KR", { year: "numeric", month: "long", day: "numeric", weekday: "long" });
 
   return (
-    <div className="space-y-6 p-4 sm:p-6">
-      {/* 환영 영역 */}
-      <div className="rounded-xl bg-gradient-to-r from-primary/10 via-primary/5 to-transparent p-6 sm:p-8">
-        <h1 className="text-xl font-bold sm:text-2xl">
-          안녕하세요, {userName}님
+    <div className="space-y-6 p-4 sm:p-6 lg:p-8">
+      {/* 헤더 영역 */}
+      <div className="flex flex-col gap-1">
+        <h1 className="text-2xl font-bold tracking-tight sm:text-3xl">
+          {userName}님, 좋은 하루 되세요
         </h1>
-        <p className="mt-2 text-sm text-muted-foreground">
-          오늘도 효율적인 업무를 시작하세요.
-        </p>
+        <p className="text-sm text-muted-foreground">{dateStr}</p>
       </div>
 
-      {/* 퀵 액세스 카드 */}
+      {/* 바로가기 */}
       <div>
-        <h2 className="mb-4 text-lg font-semibold">바로가기</h2>
-        <div className="grid grid-cols-2 gap-3 sm:grid-cols-3 lg:grid-cols-4">
+        <h2 className="mb-3 text-base font-semibold text-foreground">바로가기</h2>
+        <div className="grid grid-cols-2 gap-3 sm:grid-cols-3 lg:grid-cols-6">
           {quickAccessItems.map((item) => {
             const Icon = item.icon;
             return (
               <button
                 key={item.href}
                 onClick={() => router.push(item.href)}
-                className="group flex flex-col items-center gap-3 rounded-xl border bg-card p-4 shadow-sm transition-all hover:border-primary/30 hover:shadow-md sm:p-6"
+                className="group flex flex-col items-center gap-2.5 rounded-lg border bg-card p-4 transition-all hover:shadow-md"
               >
-                <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-primary/10 text-primary transition-colors group-hover:bg-primary/20 sm:h-12 sm:w-12">
-                  <Icon className="h-5 w-5 sm:h-6 sm:w-6" />
+                <div className={`flex h-10 w-10 items-center justify-center rounded-lg ${item.color} transition-transform group-hover:scale-105`}>
+                  <Icon className="h-5 w-5" />
                 </div>
-                <span className="text-xs font-medium sm:text-sm">{item.label}</span>
+                <span className="text-xs font-medium text-foreground">{item.label}</span>
               </button>
             );
           })}
@@ -54,11 +54,11 @@ export default function MainHomePage() {
       </div>
 
       {/* 시스템 정보 */}
-      <div className="rounded-xl border bg-card p-4 shadow-sm sm:p-6">
-        <h2 className="mb-3 text-lg font-semibold">시스템 정보</h2>
+      <div className="rounded-lg border bg-card p-4 sm:p-5">
+        <h2 className="mb-3 text-base font-semibold text-foreground">시스템 정보</h2>
         <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
           <div className="flex items-center gap-3">
-            <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-muted">
+            <div className="flex h-9 w-9 items-center justify-center rounded-md bg-muted">
               <Server className="h-4 w-4 text-muted-foreground" />
             </div>
             <div>
@@ -67,7 +67,7 @@ export default function MainHomePage() {
             </div>
           </div>
           <div className="flex items-center gap-3">
-            <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-muted">
+            <div className="flex h-9 w-9 items-center justify-center rounded-md bg-muted">
               <Shield className="h-4 w-4 text-muted-foreground" />
             </div>
             <div>
@@ -76,13 +76,13 @@ export default function MainHomePage() {
             </div>
           </div>
           <div className="flex items-center gap-3">
-            <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-muted">
+            <div className="flex h-9 w-9 items-center justify-center rounded-md bg-muted">
               <Calendar className="h-4 w-4 text-muted-foreground" />
             </div>
             <div>
               <p className="text-xs text-muted-foreground">오늘 날짜</p>
               <p className="text-sm font-medium">
-                {new Date().toLocaleDateString("ko-KR", { year: "numeric", month: "long", day: "numeric" })}
+                {today.toLocaleDateString("ko-KR", { year: "numeric", month: "long", day: "numeric" })}
               </p>
             </div>
           </div>
diff --git a/frontend/app/globals.css b/frontend/app/globals.css
index 7276f5b0..8c056ad1 100644
--- a/frontend/app/globals.css
+++ b/frontend/app/globals.css
@@ -65,28 +65,28 @@
   --radius-xl: calc(var(--radius) + 4px);
 }
 
-/* ===== CSS Variables (shadcn/ui Official) ===== */
+/* ===== CSS Variables (Vivid Blue Theme) ===== */
 :root {
   /* Light Theme Colors - HSL Format */
   --background: 0 0% 100%;
-  --foreground: 222.2 84% 4.9%;
+  --foreground: 224 71% 4%;
   --card: 0 0% 100%;
-  --card-foreground: 222.2 84% 4.9%;
+  --card-foreground: 224 71% 4%;
   --popover: 0 0% 100%;
-  --popover-foreground: 222.2 84% 4.9%;
-  --primary: 222.2 47.4% 11.2%;
-  --primary-foreground: 210 40% 98%;
-  --secondary: 210 40% 96.1%;
-  --secondary-foreground: 222.2 47.4% 11.2%;
-  --muted: 210 40% 96.1%;
-  --muted-foreground: 215.4 16.3% 46.9%;
-  --accent: 210 40% 96.1%;
-  --accent-foreground: 222.2 47.4% 11.2%;
+  --popover-foreground: 224 71% 4%;
+  --primary: 217.2 91.2% 59.8%;
+  --primary-foreground: 0 0% 100%;
+  --secondary: 220 14.3% 95.9%;
+  --secondary-foreground: 220.9 39.3% 11%;
+  --muted: 220 14.3% 95.9%;
+  --muted-foreground: 220 8.9% 46.1%;
+  --accent: 220 14.3% 95.9%;
+  --accent-foreground: 220.9 39.3% 11%;
   --destructive: 0 84.2% 60.2%;
-  --destructive-foreground: 210 40% 98%;
-  --border: 214.3 31.8% 91.4%;
-  --input: 214.3 31.8% 91.4%;
-  --ring: 222.2 84% 4.9%;
+  --destructive-foreground: 0 0% 100%;
+  --border: 220 13% 91%;
+  --input: 220 13% 91%;
+  --ring: 217.2 91.2% 59.8%;
 
   /* Success Colors (Emerald) */
   --success: 142 76% 36%;
@@ -111,37 +111,37 @@
   --radius: 0.5rem;
 
   /* Sidebar Colors */
-  --sidebar-background: 0 0% 98%;
-  --sidebar-foreground: 240 5.3% 26.1%;
-  --sidebar-primary: 240 5.9% 10%;
-  --sidebar-primary-foreground: 0 0% 98%;
-  --sidebar-accent: 240 4.8% 95.9%;
-  --sidebar-accent-foreground: 240 5.9% 10%;
+  --sidebar-background: 220 20% 97%;
+  --sidebar-foreground: 224 71% 4%;
+  --sidebar-primary: 217.2 91.2% 59.8%;
+  --sidebar-primary-foreground: 0 0% 100%;
+  --sidebar-accent: 220 14.3% 95.9%;
+  --sidebar-accent-foreground: 220.9 39.3% 11%;
   --sidebar-border: 220 13% 91%;
   --sidebar-ring: 217.2 91.2% 59.8%;
 }
 
 /* ===== Dark Theme ===== */
 .dark {
-  --background: 222.2 84% 4.9%;
-  --foreground: 210 40% 98%;
-  --card: 222.2 84% 4.9%;
-  --card-foreground: 210 40% 98%;
-  --popover: 222.2 84% 4.9%;
-  --popover-foreground: 210 40% 98%;
-  --primary: 210 40% 98%;
-  --primary-foreground: 222.2 47.4% 11.2%;
-  --secondary: 217.2 32.6% 17.5%;
-  --secondary-foreground: 210 40% 98%;
-  --muted: 217.2 32.6% 17.5%;
-  --muted-foreground: 215 20.2% 65.1%;
-  --accent: 217.2 32.6% 17.5%;
-  --accent-foreground: 210 40% 98%;
+  --background: 224 71% 4%;
+  --foreground: 210 20% 98%;
+  --card: 224 71% 4%;
+  --card-foreground: 210 20% 98%;
+  --popover: 224 71% 4%;
+  --popover-foreground: 210 20% 98%;
+  --primary: 217.2 91.2% 59.8%;
+  --primary-foreground: 0 0% 100%;
+  --secondary: 215 27.9% 16.9%;
+  --secondary-foreground: 210 20% 98%;
+  --muted: 215 27.9% 16.9%;
+  --muted-foreground: 217.9 10.6% 64.9%;
+  --accent: 215 27.9% 16.9%;
+  --accent-foreground: 210 20% 98%;
   --destructive: 0 62.8% 30.6%;
-  --destructive-foreground: 210 40% 98%;
-  --border: 217.2 32.6% 17.5%;
-  --input: 217.2 32.6% 17.5%;
-  --ring: 212.7 26.8% 83.9%;
+  --destructive-foreground: 210 20% 98%;
+  --border: 215 27.9% 16.9%;
+  --input: 215 27.9% 16.9%;
+  --ring: 217.2 91.2% 59.8%;
 
   /* Success Colors (Emerald) - Dark */
   --success: 142 76% 36%;
@@ -163,13 +163,13 @@
   --chart-5: 340 75% 55%;
 
   /* Sidebar Colors - Dark */
-  --sidebar-background: 222.2 84% 4.9%;
-  --sidebar-foreground: 210 40% 98%;
+  --sidebar-background: 224 71% 4%;
+  --sidebar-foreground: 210 20% 98%;
   --sidebar-primary: 217.2 91.2% 59.8%;
-  --sidebar-primary-foreground: 222.2 47.4% 11.2%;
-  --sidebar-accent: 217.2 32.6% 17.5%;
-  --sidebar-accent-foreground: 210 40% 98%;
-  --sidebar-border: 217.2 32.6% 17.5%;
+  --sidebar-primary-foreground: 0 0% 100%;
+  --sidebar-accent: 215 27.9% 16.9%;
+  --sidebar-accent-foreground: 210 20% 98%;
+  --sidebar-border: 215 27.9% 16.9%;
   --sidebar-ring: 217.2 91.2% 59.8%;
 }
 
diff --git a/frontend/components/auth/LoginForm.tsx b/frontend/components/auth/LoginForm.tsx
index 80d2a8fa..d0ddd1a5 100644
--- a/frontend/components/auth/LoginForm.tsx
+++ b/frontend/components/auth/LoginForm.tsx
@@ -29,7 +29,7 @@ export function LoginForm({
   onTogglePassword,
 }: LoginFormProps) {
   return (
-    <Card className="border-0 shadow-xl bg-card/80 backdrop-blur-sm">
+    <Card className="border shadow-lg">
       <CardHeader className="space-y-1">
         <CardTitle className="text-center text-2xl">로그인</CardTitle>
         <CardDescription className="text-center">계정 정보를 입력해주세요</CardDescription>
diff --git a/frontend/components/layout/AppLayout.tsx b/frontend/components/layout/AppLayout.tsx
index 24b02a4f..d62c5a95 100644
--- a/frontend/components/layout/AppLayout.tsx
+++ b/frontend/components/layout/AppLayout.tsx
@@ -407,11 +407,11 @@ function AppLayoutInner({ children }: AppLayoutProps) {
     return (
       <div key={menu.id}>
         <div
-          className={`group flex min-h-[44px] sm:min-h-[40px] cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm font-medium transition-colors duration-150 ease-in-out ${
+          className={`group flex min-h-[44px] sm:min-h-[40px] cursor-pointer items-center justify-between rounded-md px-3 py-2 text-sm font-medium transition-colors duration-150 ease-in-out ${
             pathname === menu.url
-              ? "bg-primary/10 text-primary font-semibold"
+              ? "border-l-3 border-primary bg-primary/8 text-primary font-semibold"
               : isExpanded
-                ? "bg-accent text-foreground"
+                ? "bg-accent/60 text-foreground"
                 : "text-muted-foreground hover:bg-accent hover:text-foreground"
           } ${level > 0 ? "ml-6" : ""}`}
           onClick={() => handleMenuClick(menu)}
@@ -435,9 +435,9 @@ function AppLayoutInner({ children }: AppLayoutProps) {
             {menu.children?.map((child: any) => (
               <div
                 key={child.id}
-                className={`flex min-h-[44px] sm:min-h-[40px] cursor-pointer items-center rounded-lg px-3 py-2 text-sm transition-colors duration-150 hover:cursor-pointer ${
+                className={`flex min-h-[44px] sm:min-h-[40px] cursor-pointer items-center rounded-md px-3 py-2 text-sm transition-colors duration-150 hover:cursor-pointer ${
                   pathname === child.url
-                    ? "bg-primary/10 text-primary font-semibold"
+                    ? "border-l-3 border-primary bg-primary/8 text-primary font-semibold"
                     : "text-muted-foreground hover:bg-accent hover:text-foreground"
                 }`}
                 onClick={() => handleMenuClick(child)}
@@ -552,7 +552,7 @@ function AppLayoutInner({ children }: AppLayoutProps) {
             isMobile
               ? (sidebarOpen ? "translate-x-0" : "-translate-x-full") + " fixed top-14 left-0 z-40 h-[calc(100vh-56px)]"
               : "relative z-auto h-screen translate-x-0"
-          } flex w-[260px] sm:w-[220px] lg:w-[240px] flex-col border-r border-border bg-background transition-transform duration-300`}
+          } flex w-[260px] sm:w-[220px] lg:w-[240px] flex-col border-r border-sidebar-border bg-sidebar transition-transform duration-300`}
         >
           {/* 사이드바 최상단 - 로고 (데스크톱에서만 표시) */}
           {!isMobile && (
@@ -563,7 +563,7 @@ function AppLayoutInner({ children }: AppLayoutProps) {
 
           {/* WACE 관리자: 현재 관리 회사 표시 */}
           {(user as ExtendedUserInfo)?.userType === "SUPER_ADMIN" && (
-            <div className="mx-3 mt-3 rounded-lg border bg-gradient-to-r from-primary/10 to-primary/5 p-3">
+            <div className="mx-3 mt-3 rounded-md border border-border bg-muted/50 p-3">
               <div className="flex items-center gap-2">
                 <Building2 className="h-4 w-4 shrink-0 text-primary" />
                 <div className="min-w-0 flex-1">
@@ -584,10 +584,10 @@ function AppLayoutInner({ children }: AppLayoutProps) {
             {/* 관리자/사용자 메뉴 전환 */}
             <Button
               onClick={handleModeSwitch}
-              className={`flex w-full items-center justify-center gap-2 rounded-lg px-3 py-2 text-sm font-medium transition-colors duration-150 hover:cursor-pointer ${
+              className={`flex w-full items-center justify-center gap-2 rounded-md px-3 py-2 text-sm font-medium transition-colors duration-150 hover:cursor-pointer ${
                 isAdminMode
-                  ? "border border-warning/20 bg-warning/10 text-warning hover:bg-warning/20"
-                  : "border border-primary/20 bg-primary/10 text-primary hover:bg-primary/20"
+                  ? "border border-amber-200 bg-amber-50 text-amber-700 hover:bg-amber-100 dark:border-amber-800 dark:bg-amber-950 dark:text-amber-400"
+                  : "border border-primary/20 bg-primary/5 text-primary hover:bg-primary/10"
               }`}
             >
               {isAdminMode ? (
@@ -607,7 +607,7 @@ function AppLayoutInner({ children }: AppLayoutProps) {
             {(user as ExtendedUserInfo)?.userType === "SUPER_ADMIN" && (
               <Button
                 onClick={() => { console.log("🔴 회사 선택 버튼 클릭!"); setShowCompanySwitcher(true); }}
-                className="flex w-full items-center justify-center gap-2 rounded-lg border border-primary/20 bg-primary/10 px-3 py-2 text-sm font-medium text-primary transition-colors duration-150 hover:cursor-pointer hover:bg-primary/20"
+                className="flex w-full items-center justify-center gap-2 rounded-md border border-primary/20 bg-primary/5 px-3 py-2 text-sm font-medium text-primary transition-colors duration-150 hover:cursor-pointer hover:bg-primary/10"
               >
                 <Building2 className="h-4 w-4" />
                 회사 선택
diff --git a/frontend/components/ui/button.tsx b/frontend/components/ui/button.tsx
index 9a7847f7..36cbf4ad 100644
--- a/frontend/components/ui/button.tsx
+++ b/frontend/components/ui/button.tsx
@@ -9,11 +9,11 @@ const buttonVariants = cva(
   {
     variants: {
       variant: {
-        default: "bg-background border border-foreground text-foreground shadow-xs hover:bg-muted/50",
+        default: "bg-primary text-primary-foreground shadow-xs hover:bg-primary/90",
         destructive:
           "bg-destructive text-white shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
         outline:
-          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
+          "border border-input bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
         secondary: "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80",
         ghost: "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
         link: "text-primary underline-offset-4 hover:underline",