레이아웃/스크롤바 개선

- Layout 배경 그라디언트를 body fixed 배경으로 이동 (스크롤 시 하단 배경 일관성)
- 해방 계산기 데스티니 탭 placeholder에 최소 높이 부여
- overlayscrollbars 도입: 메인 스크롤바가 콘텐츠를 밀지 않고 오버레이로 표시
- 내부 스크롤 영역은 얇은 커스텀 스크롤바 유지

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package-lock.json

@@ -14,6 +14,8 @@
         "@tanstack/react-query": "^5.91.0",
         "dayjs": "^1.11.20",
         "framer-motion": "^12.23.22",
+        "overlayscrollbars": "^2.15.1",
+        "overlayscrollbars-react": "^0.5.6",
         "react": "^19.2.4",
         "react-dom": "^19.2.4",
         "react-router-dom": "^7.14.0"
@@ -2552,6 +2554,22 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/overlayscrollbars": {
+      "version": "2.15.1",
+      "resolved": "https://registry.npmjs.org/overlayscrollbars/-/overlayscrollbars-2.15.1.tgz",
+      "integrity": "sha512-glX26JwjL+Tkzv0JNOWdW4VozP5dGXO+Wx8+TPrdTEJTSYT/8eJS8yXM+fewjU0nFq/JeCa+X+BqABNjC4YZSA==",
+      "license": "MIT"
+    },
+    "node_modules/overlayscrollbars-react": {
+      "version": "0.5.6",
+      "resolved": "https://registry.npmjs.org/overlayscrollbars-react/-/overlayscrollbars-react-0.5.6.tgz",
+      "integrity": "sha512-E5To04bL5brn9GVCZ36SnfGanxa2I2MDkWoa4Cjo5wol7l+diAgi4DBc983V7l2nOk/OLJ6Feg4kySspQEGDBw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "overlayscrollbars": "^2.0.0",
+        "react": ">=16.8.0"
+      }
+    },
     "node_modules/p-limit": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",

frontend/package.json

@@ -16,6 +16,8 @@
     "@tanstack/react-query": "^5.91.0",
     "dayjs": "^1.11.20",
     "framer-motion": "^12.23.22",
+    "overlayscrollbars": "^2.15.1",
+    "overlayscrollbars-react": "^0.5.6",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-router-dom": "^7.14.0"

frontend/src/components/Layout.jsx

@@ -57,7 +57,7 @@ export default function Layout() {
 
   return (
     <LayoutContext.Provider value={{ fullscreen, setFullscreen }}>
-      <div className={`min-w-[1280px] bg-gradient-to-br from-gray-950 via-gray-950 to-slate-900 text-white flex flex-col ${
+      <div className={`min-w-[1280px] text-white flex flex-col ${
         fullscreen ? 'h-dvh' : 'min-h-screen'
       }`}>
         <header className="sticky top-0 z-20 border-b border-white/5 bg-gray-950/80 backdrop-blur-md shrink-0">

frontend/src/features/liberation/Liberation.jsx

@@ -286,7 +286,7 @@ export default function Liberation() {
   const overallProgress = Math.min((totalCumulative / GENESIS_TOTAL) * 100, 100)
 
   return (
-    <div className="space-y-6">
+    <div className="space-y-6 pb-10">
       {/* 해방 종류 탭 */}
       <div className="max-w-2xl mx-auto flex gap-2">
         {[
@@ -310,7 +310,7 @@ export default function Liberation() {
       </div>
 
       {liberationType === 'destiny' ? (
-        <div className="max-w-2xl mx-auto rounded-2xl border border-white/10 bg-gray-900/60 p-16 text-center space-y-3">
+        <div className="max-w-2xl mx-auto rounded-2xl border border-white/10 bg-gray-900/60 p-16 text-center space-y-3 flex flex-col items-center justify-center" style={{ minHeight: 'calc(100vh - 220px)' }}>
           <div className="text-2xl font-bold text-gray-300">구현 예정</div>
           <div className="text-sm text-gray-500">데스티니 해방 계산기는 준비 중입니다.</div>
         </div>

frontend/src/index.css

@@ -1,4 +1,5 @@
 @import "tailwindcss";
+@import "overlayscrollbars/overlayscrollbars.css";
 
 @theme {
   --font-sans: "Maplestory", "Noto Sans KR", system-ui, -apple-system, sans-serif;
@@ -6,8 +7,19 @@
 }
 
 html, body, #root {
-  height: 100%;
-  background: #030712;
+  min-height: 100%;
+  background: linear-gradient(to bottom right, #030712, #030712, #0f172a);
+  background-attachment: fixed;
+}
+
+/* OverlayScrollbars body 오버레이 테마 */
+.os-theme-maple.os-theme-dark {
+  --os-handle-bg: rgba(255, 255, 255, 0.25);
+  --os-handle-bg-hover: rgba(255, 255, 255, 0.4);
+  --os-handle-bg-active: rgba(255, 255, 255, 0.5);
+  --os-size: 12px;
+  --os-padding-perpendicular: 2px;
+  --os-padding-axis: 2px;
 }
 
 html {
@@ -46,26 +58,27 @@ input[type="number"] {
   to { opacity: 1; transform: translateY(0); }
 }
 
-/* 커스텀 스크롤바 */
-* {
+
+/* 내부 스크롤 영역만 얇은 커스텀 스크롤바 (메인 페이지 스크롤은 기본) */
+*:not(html):not(body) {
   scrollbar-width: thin;
   scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
 }
-*::-webkit-scrollbar {
+*:not(html):not(body)::-webkit-scrollbar {
   width: 8px;
   height: 8px;
 }
-*::-webkit-scrollbar-track {
+*:not(html):not(body)::-webkit-scrollbar-track {
   background: transparent;
 }
-*::-webkit-scrollbar-thumb {
-  background: rgba(255, 255, 255, 0.08);
+*:not(html):not(body)::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.12);
   border-radius: 4px;
   transition: background 0.2s;
 }
-*::-webkit-scrollbar-thumb:hover {
-  background: rgba(255, 255, 255, 0.18);
+*:not(html):not(body)::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.22);
 }
-*::-webkit-scrollbar-corner {
+*:not(html):not(body)::-webkit-scrollbar-corner {
   background: transparent;
 }

frontend/src/main.jsx

@@ -2,9 +2,18 @@ import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { BrowserRouter } from 'react-router-dom'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { OverlayScrollbars } from 'overlayscrollbars'
 import './index.css'
 import App from './App.jsx'
 
+// body 전체에 오버레이 스크롤바 적용 (화면을 밀지 않음)
+OverlayScrollbars(
+  { target: document.body, cancel: { nativeScrollbarsOverlaid: true } },
+  {
+    scrollbars: { theme: 'os-theme-maple os-theme-dark', autoHide: 'leave', autoHideDelay: 800 },
+  }
+)
+
 const queryClient = new QueryClient({
   defaultOptions: {
     queries: {