diff --git a/src/api/auth.js b/src/api/auth.js
index be8a0df..a50c564 100644
--- a/src/api/auth.js
+++ b/src/api/auth.js
@@ -18,3 +18,25 @@ export async function logout() {
   return apiFetch('/api/auth/logout', { method: 'POST' });
 }
 
+// 토큰을 리프레시하고 새 access token을 반환
+export async function refreshToken() {
+  const rt = localStorage.getItem('refreshToken');
+  if (!rt) throw new Error('no_refresh_token');
+
+  const res = await fetch(
+    (import.meta.env.VITE_API_BASE_URL || '') + '/api/auth/refresh',
+    {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ refreshToken: rt }),
+    }
+  );
+
+  if (!res.ok) throw new Error('refresh_failed');
+
+  const data = await res.json();
+  localStorage.setItem('token', data.token);
+  localStorage.setItem('refreshToken', data.refreshToken);
+  return data.token;
+}
+
diff --git a/src/components/DownloadSection.css b/src/components/DownloadSection.css
index 887f654..c7713ea 100644
--- a/src/components/DownloadSection.css
+++ b/src/components/DownloadSection.css
@@ -70,6 +70,10 @@
   margin: 16px 0 0;
 }
 
+.launch-hint-active {
+  color: #BACDB0;
+}
+
 .download-preparing {
   font-size: 0.9rem;
   color: rgba(255, 255, 255, 0.4);
diff --git a/src/components/DownloadSection.jsx b/src/components/DownloadSection.jsx
index 592fdc2..b6f87cc 100644
--- a/src/components/DownloadSection.jsx
+++ b/src/components/DownloadSection.jsx
@@ -1,31 +1,56 @@
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useCallback } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useAuth } from '../context/useAuth';
 import { getDownloadInfo } from '../api/download';
+import { refreshToken } from '../api/auth';
 import './DownloadSection.css';
 
 export default function DownloadSection() {
   const [info, setInfo] = useState(null);
   const [ready, setReady] = useState(false);
+  const [loadError, setLoadError] = useState(false);
+  const [launched, setLaunched] = useState(false);
+  const [launching, setLaunching] = useState(false);
   const { user } = useAuth();
   const navigate = useNavigate();
 
-  useEffect(() => {
+  const loadInfo = useCallback(() => {
+    setReady(false);
+    setLoadError(false);
     getDownloadInfo()
       .then((data) => { setInfo(data); setReady(true); })
-      .catch(() => setReady(true));
+      .catch(() => { setLoadError(true); setReady(true); });
   }, []);
 
-  const handlePlay = () => {
+  useEffect(() => { loadInfo(); }, [loadInfo]);
+
+  const handlePlay = async () => {
     if (!user) {
       navigate('/login');
       return;
     }
 
-    // user.token은 로그인 시점 값으로 만료됐을 수 있으므로
-    // tryRefresh가 갱신한 최신 토큰을 localStorage에서 직접 읽음
-    const token = localStorage.getItem('token');
-    window.location.href = 'a301://launch?token=' + token;
+    // 토큰이 없으면 (다른 탭에서 로그아웃 등) 로그인 유도
+    let token = localStorage.getItem('token');
+    if (!token) {
+      navigate('/login');
+      return;
+    }
+
+    setLaunching(true);
+
+    // 토큰 만료 대비: 런처에 전달하기 전에 리프레시 시도
+    try {
+      token = await refreshToken();
+    } catch {
+      // 리프레시 실패해도 기존 토큰으로 시도 (아직 유효할 수 있음)
+    }
+
+    window.location.href = 'a301://launch?token=' + encodeURIComponent(token);
+
+    // 런처가 실행되지 않았을 수 있으므로 안내 표시
+    setLaunched(true);
+    setLaunching(false);
   };
 
   const handleDownloadLauncher = () => {
@@ -48,20 +73,37 @@ export default function DownloadSection() {
             <p className="download-meta">
               {info.version} &middot; {info.fileSize}
             </p>
-            <button onClick={handlePlay} className="btn-play">
-              게임 시작
+            <button onClick={handlePlay} className="btn-play" disabled={launching}>
+              {launching ? '준비 중...' : '게임 시작'}
             </button>
             {info?.launcherUrl && (
               <button onClick={handleDownloadLauncher} className="btn-launcher-download">
                 런처 다운로드
               </button>
             )}
-            <p className="launch-hint">
-              처음이거나 게임이 실행되지 않으면 런처를 다운로드해주세요.
-            </p>
+            {launched ? (
+              <p className="launch-hint launch-hint-active">
+                게임이 실행되지 않나요? 런처를 다운로드한 뒤 한 번 실행해주세요.
+              </p>
+            ) : (
+              <p className="launch-hint">
+                처음이거나 게임이 실행되지 않으면 런처를 다운로드해주세요.
+              </p>
+            )}
           </>
         ) : (
-          <p className="download-preparing">런처 준비 중입니다. 잠시 후 다시 확인해주세요.</p>
+          <>
+            <p className="download-preparing">
+              {loadError
+                ? '서버에 연결할 수 없습니다.'
+                : '런처 준비 중입니다. 잠시 후 다시 확인해주세요.'}
+            </p>
+            {loadError && (
+              <button onClick={loadInfo} className="btn-launcher-download">
+                다시 시도
+              </button>
+            )}
+          </>
         )}
       </div>
     </section>
diff --git a/src/pages/LoginPage.css b/src/pages/LoginPage.css
index 636b394..1a00ba8 100644
--- a/src/pages/LoginPage.css
+++ b/src/pages/LoginPage.css
@@ -164,3 +164,13 @@
 .login-back:hover {
   color: rgba(255, 255, 255, 0.7);
 }
+
+.password-strength {
+  font-size: 0.8rem;
+  color: rgba(186, 205, 176, 0.7);
+  margin: -12px 0 0;
+}
+
+.password-strength.strength-weak {
+  color: #e57373;
+}
diff --git a/src/pages/RegisterPage.jsx b/src/pages/RegisterPage.jsx
index 6cc901c..4710050 100644
--- a/src/pages/RegisterPage.jsx
+++ b/src/pages/RegisterPage.jsx
@@ -11,6 +11,22 @@ export default function RegisterPage() {
   const [loading, setLoading] = useState(false);
   const navigate = useNavigate();
 
+  const getPasswordStrength = (pw) => {
+    if (pw.length === 0) return '';
+    if (pw.length < 6) return '비밀번호는 6자 이상이어야 합니다.';
+    let strength = 0;
+    if (/[a-z]/.test(pw)) strength++;
+    if (/[A-Z]/.test(pw)) strength++;
+    if (/[0-9]/.test(pw)) strength++;
+    if (/[^a-zA-Z0-9]/.test(pw)) strength++;
+    if (strength <= 1) return '약함';
+    if (strength <= 2) return '보통';
+    return '강함';
+  };
+
+  const passwordStrength = getPasswordStrength(password);
+  const isPasswordWeak = password.length > 0 && password.length < 6;
+
   const handleSubmit = async (e) => {
     e.preventDefault();
     setError('');
@@ -68,6 +84,12 @@ export default function RegisterPage() {
             />
           </div>
 
+          {passwordStrength && (
+            <p className={`password-strength ${isPasswordWeak ? 'strength-weak' : ''}`}>
+              강도: {passwordStrength}
+            </p>
+          )}
+
           <div className="input-group">
             <label htmlFor="confirm">비밀번호 확인</label>
             <input