Sub-step 이전/다음 navigation + EULA popup flow

- Each 3-x and 4-x sub-step now has its own [이전][다음] action row at the bottom; 이전 returns to the previous sub-step (or previous main step on the first one) so users can move freely both directions
- 3-3 EULA: replace the inline checkbox with a modal popup. After server zip downloads, the renderer reads eula.txt via server:readEula; if absent, falls back to the live minecraft.net/en-us/eula HTML via server:fetchMinecraftEula and shows it in a sandboxed iframe
- Popup buttons: 동의 → server:acceptEula and proceed to RAM check; 비동의 / X / overlay click → "EULA 동의 실패. 다운로드를 취소합니다." and re-enable 다운로드 시작 for retry
- main.ts: stop auto-deleting eula.txt after server zip extraction so the popup can read whatever the zip provided
- 4-2 install completion now keeps a state.client.clientInstalled flag so backing into 4-2 doesn't force a re-install

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

installer/renderer.js

@@ -160,19 +160,17 @@ function renderStep3() {
   section.className = 'page'
   section.innerHTML =
     '<h2>3단계. 서버 관련 설정</h2>' +
-    '<div class="subStep" id="subHost"></div>' +
-    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><span></span></div>'
+    '<div class="subStep" id="subHost"></div>'
   pageHost.appendChild(section)
   var subHost = section.querySelector('#subHost')
-  section.querySelector('#back').addEventListener('click', renderStep2)
 
-  function show31() { subHost.innerHTML = ''; renderSubStep31(subHost, show32) }
-  function show32() { subHost.innerHTML = ''; renderSubStep32(subHost, show33) }
-  function show33() { subHost.innerHTML = ''; renderSubStep33(subHost, show34) }
-  function show34() { subHost.innerHTML = ''; renderSubStep34(subHost, show35) }
+  function show31() { subHost.innerHTML = ''; renderSubStep31(subHost, renderStep2, show32) }
+  function show32() { subHost.innerHTML = ''; renderSubStep32(subHost, show31, show33) }
+  function show33() { subHost.innerHTML = ''; renderSubStep33(subHost, show32, show34) }
+  function show34() { subHost.innerHTML = ''; renderSubStep34(subHost, show33, show35) }
   function show35() {
     subHost.innerHTML = ''
-    renderSubStep35(subHost, function () {
+    renderSubStep35(subHost, show34, function () {
       state.stepDone[3] = true
       renderStep4()
     })
@@ -180,21 +178,22 @@ function renderStep3() {
   show31()
 }
 
-function renderSubStep31(host, done) {
+function renderSubStep31(host, back, done) {
   host.innerHTML =
     '<h3>3-1. 서버 설치 경로</h3>' +
     '<p class="formMessage">서버를 생성할 폴더를 선택하세요. 경로에 한글이 포함되면 안 됩니다.</p>' +
     '<div class="fieldset"><label><input id="installPath" type="text" placeholder="C:\\MusicQuizServer" value="' + (state.serverInstall.path || '') + '" /></label>' +
     '<button class="secondaryBtn" id="pickFolder">폴더 선택</button></div>' +
     '<div class="formMessage" id="msg"></div>' +
-    '<button class="primaryBtn" id="confirm">확인</button>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next">다음</button></div>'
   var input = host.querySelector('#installPath')
   var msg = host.querySelector('#msg')
   host.querySelector('#pickFolder').addEventListener('click', async function () {
     var picked = await installerApi.pickFolder()
     if (picked) input.value = picked
   })
-  host.querySelector('#confirm').addEventListener('click', async function () {
+  host.querySelector('#back').addEventListener('click', back)
+  host.querySelector('#next').addEventListener('click', async function () {
     var result = await installerApi.validateInstallPath(input.value.trim())
     if (!result.ok) {
       msg.textContent = result.message || '경로가 유효하지 않습니다.'
@@ -209,7 +208,7 @@ function renderSubStep31(host, done) {
   })
 }
 
-function renderSubStep32(host, done) {
+function renderSubStep32(host, back, done) {
   host.innerHTML =
     '<h3>3-2. JDK 확인</h3>' +
     '<p class="formMessage">JAVA_HOME 또는 C:\\Program Files\\Java 에서 자동 탐색합니다. 직접 폴더를 선택해도 됩니다.</p>' +
@@ -217,7 +216,7 @@ function renderSubStep32(host, done) {
     '<button class="secondaryBtn" id="pickJdk">폴더 선택</button>' +
     '<button class="secondaryBtn" id="auto">자동 탐색</button></div>' +
     '<div class="formMessage" id="msg"></div>' +
-    '<button class="primaryBtn" id="confirm">확인</button>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next">다음</button></div>'
   var input = host.querySelector('#jdkPath')
   var msg = host.querySelector('#msg')
   host.querySelector('#auto').addEventListener('click', async function () {
@@ -236,7 +235,8 @@ function renderSubStep32(host, done) {
     var picked = await installerApi.pickFolder()
     if (picked) input.value = picked
   })
-  host.querySelector('#confirm').addEventListener('click', function () {
+  host.querySelector('#back').addEventListener('click', back)
+  host.querySelector('#next').addEventListener('click', function () {
     if (!input.value.trim()) {
       msg.textContent = 'JDK 경로를 입력해 주세요.'
       msg.classList.add('error')
@@ -255,35 +255,39 @@ function renderSubStep32(host, done) {
   })()
 }
 
-function renderSubStep33(host, done) {
+function renderSubStep33(host, back, done) {
   host.innerHTML =
     '<h3>3-3. 서버 다운로드 및 설치</h3>' +
     '<p class="formMessage">선택한 음악퀴즈의 서버 파일을 다운로드합니다. 진행 상황은 하단 로그 뷰어에 표시됩니다.</p>' +
     '<div class="formMessage" id="downloadStatus">대기 중</div>' +
     '<button class="primaryBtn" id="startDownload">다운로드 시작</button>' +
-    '<div id="eulaSection" hidden style="margin-top:14px;">' +
-    '<h3>3-3-3. EULA 동의</h3>' +
-    '<div class="eulaBox">Minecraft EULA: 본 설치는 Minecraft End User License Agreement (https://www.minecraft.net/ko-kr/eula) 동의가 필요합니다. 동의 시 eula.txt가 새로 작성됩니다.</div>' +
-    '<label class="toggleRow"><input id="eulaCheck" type="checkbox" /> Minecraft EULA에 동의합니다.</label>' +
-    '<div class="formMessage" id="eulaMsg"></div>' +
-    '</div>' +
     '<div id="ramSection" hidden style="margin-top:14px;">' +
-    '<h3>3-3-4. 램 검사</h3>' +
+    '<h4>램 검사</h4>' +
     '<div class="formMessage" id="ramMsg">검사 중...</div>' +
     '</div>' +
-    '<div class="actionRow"><span></span><button class="primaryBtn" id="confirm" hidden>다음</button></div>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next" disabled>다음</button></div>'
 
   var startBtn = host.querySelector('#startDownload')
   var statusEl = host.querySelector('#downloadStatus')
-  var eulaSection = host.querySelector('#eulaSection')
   var ramSection = host.querySelector('#ramSection')
   var ramMsg = host.querySelector('#ramMsg')
-  var confirmBtn = host.querySelector('#confirm')
-  var eulaCheck = host.querySelector('#eulaCheck')
-  var eulaMsg = host.querySelector('#eulaMsg')
+  var nextBtn = host.querySelector('#next')
+
+  host.querySelector('#back').addEventListener('click', back)
+
+  // 이미 통과했던 상태 복원: 사용자가 다음→이전으로 돌아왔을 때 재다운로드 강요하지 않는다.
+  if (state.serverInstall.eulaAccepted && state.serverInstall.ram) {
+    statusEl.textContent = '다운로드 및 EULA 동의 완료.'
+    statusEl.classList.add('success')
+    showRamResult(state.serverInstall.ram)
+    nextBtn.disabled = false
+  }
 
   startBtn.addEventListener('click', async function () {
     startBtn.disabled = true
+    state.serverInstall.eulaAccepted = false
+    nextBtn.disabled = true
+    statusEl.classList.remove('success', 'error')
     statusEl.textContent = '다운로드 중...'
     try {
       await installerApi.startServerInstall({
@@ -291,55 +295,123 @@ function renderSubStep33(host, done) {
         installPath: state.serverInstall.path,
         jdkPath: state.serverInstall.jdk
       })
-      statusEl.textContent = '다운로드 완료. EULA 동의가 필요합니다.'
-      eulaSection.hidden = false
+      statusEl.textContent = 'EULA 동의가 필요합니다. 팝업을 확인해 주세요.'
+      var accepted = await openEulaPopup(state.serverInstall.path)
+      if (!accepted) {
+        statusEl.textContent = 'EULA 동의 실패. 다운로드를 취소합니다. "다운로드 시작"으로 다시 시도하세요.'
+        statusEl.classList.add('error')
+        startBtn.disabled = false
+        return
+      }
+      try {
+        await installerApi.acceptEula(state.serverInstall.path)
+      } catch (err) {
+        statusEl.textContent = 'EULA 저장 실패: ' + err.message
+        statusEl.classList.add('error')
+        startBtn.disabled = false
+        return
+      }
+      state.serverInstall.eulaAccepted = true
+      statusEl.textContent = '다운로드 및 EULA 동의 완료.'
+      statusEl.classList.add('success')
+      var ram = await installerApi.checkRam(state.selectedPackKey)
+      state.serverInstall.ram = ram
+      showRamResult(ram)
+      if (ram.decision === 'tooLow') return
+      nextBtn.disabled = false
     } catch (err) {
       statusEl.textContent = '다운로드 실패: ' + err.message
+      statusEl.classList.add('error')
       startBtn.disabled = false
     }
   })
 
-  eulaCheck.addEventListener('change', async function () {
-    if (!eulaCheck.checked) return
-    try {
-      await installerApi.acceptEula(state.serverInstall.path)
-      eulaMsg.textContent = 'EULA 동의 저장됨.'
-      eulaMsg.classList.add('success')
-      ramSection.hidden = false
-      var result = await installerApi.checkRam(state.selectedPackKey)
-      state.serverInstall.ram = result
-      if (result.decision === 'tooLow') {
-        ramMsg.innerHTML = '시스템 램(' + result.systemRamMb + 'MB)이 음악퀴즈 최소 요구치(' + (state.packs.find(function (p) { return p.key === state.selectedPackKey }).pack.serverMinRam) + 'MB)에 미치지 못합니다. 설치를 중단합니다.'
-        ramMsg.classList.add('error')
-        return
-      }
-      if (result.decision === 'minOk') {
-        ramMsg.innerHTML = '시스템 램(' + result.systemRamMb + 'MB)이 권장치보다 부족합니다. 최소치(' + result.appliedRamMb + 'MB)로 진행합니다.'
-        ramMsg.classList.add('warn')
-      } else {
-        ramMsg.textContent = '시스템 램(' + result.systemRamMb + 'MB) 충분. ' + result.appliedRamMb + 'MB로 설정.'
-        ramMsg.classList.add('success')
-      }
-      confirmBtn.hidden = false
-    } catch (err) {
-      eulaMsg.textContent = 'EULA 저장 실패: ' + err.message
-      eulaMsg.classList.add('error')
-    }
+  nextBtn.addEventListener('click', function () {
+    if (!state.serverInstall.eulaAccepted) return
+    done()
   })
 
-  confirmBtn.addEventListener('click', function () {
-    state.serverInstall.eulaAccepted = true
-    done()
+  function showRamResult(result) {
+    ramSection.hidden = false
+    ramMsg.classList.remove('error', 'warn', 'success')
+    if (result.decision === 'tooLow') {
+      var pack = state.packs.find(function (p) { return p.key === state.selectedPackKey })
+      var minRam = pack ? pack.pack.serverMinRam : 0
+      ramMsg.innerHTML = '시스템 램(' + result.systemRamMb + 'MB)이 음악퀴즈 최소 요구치(' + minRam + 'MB)에 미치지 못합니다. 설치를 중단합니다.'
+      ramMsg.classList.add('error')
+    } else if (result.decision === 'minOk') {
+      ramMsg.innerHTML = '시스템 램(' + result.systemRamMb + 'MB)이 권장치보다 부족합니다. 최소치(' + result.appliedRamMb + 'MB)로 진행합니다.'
+      ramMsg.classList.add('warn')
+    } else {
+      ramMsg.textContent = '시스템 램(' + result.systemRamMb + 'MB) 충분. ' + result.appliedRamMb + 'MB로 설정.'
+      ramMsg.classList.add('success')
+    }
+  }
+}
+
+// EULA 동의 팝업. resolve(true) = 동의, resolve(false) = 비동의/창 닫힘.
+async function openEulaPopup(installPath) {
+  var read = await installerApi.readEula(installPath)
+  var bodyHtml = ''
+  if (read.exists) {
+    bodyHtml = '<p class="formMessage">서버 파일에 포함된 eula.txt 내용입니다.</p>' +
+      '<pre class="eulaPre">' + escapeHtml(read.content) + '</pre>'
+  } else {
+    var fetched = await installerApi.fetchMinecraftEula()
+    if (fetched.html) {
+      bodyHtml = '<p class="formMessage">서버 파일에 eula.txt가 없어 minecraft.net의 EULA를 표시합니다 (<a href="' + fetched.url + '" target="_blank">' + fetched.url + '</a>).</p>' +
+        '<iframe class="eulaFrame" sandbox srcdoc="' + escapeAttr(fetched.html) + '"></iframe>'
+    } else {
+      bodyHtml = '<p class="formMessage error">EULA 페이지를 불러올 수 없습니다. 직접 확인해 주세요: <a href="https://www.minecraft.net/en-us/eula" target="_blank">https://www.minecraft.net/en-us/eula</a></p>'
+    }
+  }
+  return new Promise(function (resolve) {
+    var overlay = document.createElement('div')
+    overlay.className = 'modalOverlay'
+    overlay.innerHTML =
+      '<div class="modalCard" role="dialog" aria-modal="true">' +
+      '<header><h3>Minecraft EULA 동의</h3><button type="button" class="modalClose" aria-label="닫기">×</button></header>' +
+      '<div class="modalBody">' + bodyHtml + '</div>' +
+      '<footer class="actionRow">' +
+      '<button type="button" class="secondaryBtn" data-action="reject">비동의</button>' +
+      '<button type="button" class="primaryBtn" data-action="accept">동의</button>' +
+      '</footer>' +
+      '</div>'
+    document.body.appendChild(overlay)
+
+    var settled = false
+    function close(result) {
+      if (settled) return
+      settled = true
+      overlay.remove()
+      resolve(result)
+    }
+    overlay.querySelector('[data-action="accept"]').addEventListener('click', function () { close(true) })
+    overlay.querySelector('[data-action="reject"]').addEventListener('click', function () { close(false) })
+    overlay.querySelector('.modalClose').addEventListener('click', function () { close(false) })
+    overlay.addEventListener('click', function (event) {
+      if (event.target === overlay) close(false)
+    })
   })
 }
 
-function renderSubStep34(host, done) {
+function escapeHtml(text) {
+  return String(text).replace(/[&<>"']/g, function (ch) {
+    return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[ch]
+  })
+}
+
+function escapeAttr(text) {
+  return String(text).replace(/&/g, '&amp;').replace(/"/g, '&quot;')
+}
+
+function renderSubStep34(host, back, done) {
   host.innerHTML =
     '<h3>3-4. 서버 설정 편집</h3>' +
     '<p class="formMessage">로컬 웹서버를 띄워 server.properties / bukkit.yml 등을 GUI로 편집합니다.</p>' +
     '<button class="secondaryBtn" id="open">편집기 열기</button>' +
     '<div class="formMessage" id="editorMsg"></div>' +
-    '<button class="primaryBtn" id="confirm">확인</button>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next">다음</button></div>'
   host.querySelector('#open').addEventListener('click', async function () {
     var msg = host.querySelector('#editorMsg')
     try {
@@ -350,19 +422,22 @@ function renderSubStep34(host, done) {
       msg.classList.add('error')
     }
   })
-  host.querySelector('#confirm').addEventListener('click', done)
+  host.querySelector('#back').addEventListener('click', back)
+  host.querySelector('#next').addEventListener('click', done)
 }
 
-function renderSubStep35(host, done) {
+function renderSubStep35(host, back, done) {
   host.innerHTML =
     '<h3>3-5. 포트포워딩 점검</h3>' +
     '<p class="formMessage">서버의 외부 접근 가능 여부를 확인합니다. UPnP를 시도해도 안 되면 직접 포트포워딩을 안내합니다.</p>' +
     '<div class="fieldset"><label>포트 <input id="port" type="text" value="25565" /></label></div>' +
     '<button class="secondaryBtn" id="run">검사 시작</button>' +
     '<div class="formMessage" id="resultMsg"></div>' +
-    '<button class="primaryBtn" id="confirm" hidden>확인</button>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next" disabled>다음</button></div>'
   var resultMsg = host.querySelector('#resultMsg')
-  var confirmBtn = host.querySelector('#confirm')
+  var nextBtn = host.querySelector('#next')
+  if (state.serverInstall.portStatus) nextBtn.disabled = false
+  host.querySelector('#back').addEventListener('click', back)
   host.querySelector('#run').addEventListener('click', async function () {
     var port = Number(host.querySelector('#port').value) || 25565
     resultMsg.textContent = '확인 중...'
@@ -379,9 +454,9 @@ function renderSubStep35(host, done) {
         '<br><small>외부 IP: ' + (result.externalIp || '확인 불가') + ', 포트: ' + result.port + '</small>'
       resultMsg.classList.add('warn')
     }
-    confirmBtn.hidden = false
+    nextBtn.disabled = false
   })
-  confirmBtn.addEventListener('click', done)
+  nextBtn.addEventListener('click', done)
 }
 
 function renderStep4() {
@@ -392,25 +467,16 @@ function renderStep4() {
   section.className = 'page'
   section.innerHTML =
     '<h2>4단계. 유저 클라이언트 설정</h2>' +
-    '<div class="subStep" id="subHost"></div>' +
-    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><span></span></div>'
+    '<div class="subStep" id="subHost"></div>'
   pageHost.appendChild(section)
   var subHost = section.querySelector('#subHost')
-  section.querySelector('#back').addEventListener('click', function () {
-    if (state.mode === 'multi') renderStep3(); else renderStep2()
-  })
+  function backToPrevStep() { if (state.mode === 'multi') renderStep3(); else renderStep2() }
 
-  function show41() {
-    subHost.innerHTML = ''
-    renderSubStep41(subHost, pack, show42)
-  }
-  function show42() {
-    subHost.innerHTML = ''
-    renderSubStep42(subHost, show43)
-  }
+  function show41() { subHost.innerHTML = ''; renderSubStep41(subHost, pack, backToPrevStep, show42) }
+  function show42() { subHost.innerHTML = ''; renderSubStep42(subHost, show41, show43) }
   function show43() {
     subHost.innerHTML = ''
-    renderSubStep43(subHost, function () {
+    renderSubStep43(subHost, show42, function () {
       state.stepDone[4] = true
       renderStep5()
     })
@@ -418,7 +484,7 @@ function renderStep4() {
   show41()
 }
 
-function renderSubStep41(host, pack, done) {
+function renderSubStep41(host, pack, back, done) {
   var platformType = pack ? pack.pack.platform.type : 'vanilla'
   if (platformType === 'vanilla') {
     state.client.installPlatform = false
@@ -426,7 +492,8 @@ function renderSubStep41(host, pack, done) {
       '<h3>4-1. 모드 플랫폼</h3>' +
       '<p class="formMessage">선택한 음악퀴즈의 플랫폼: <strong>vanilla</strong></p>' +
       '<p class="formMessage">바닐라이므로 별도 설치는 필요 없습니다.</p>' +
-      '<div class="actionRow"><span></span><button class="primaryBtn" id="next">다음</button></div>'
+      '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next">다음</button></div>'
+    host.querySelector('#back').addEventListener('click', back)
     host.querySelector('#next').addEventListener('click', done)
     return
   }
@@ -438,7 +505,7 @@ function renderSubStep41(host, pack, done) {
     '<button type="button" data-choice="install"><strong>권장 플랫폼 설치</strong><br><small>' + platformType + ' 설치파일을 함께 다운로드해 4-2 설치 시작 시 함께 설치됩니다.</small></button>' +
     '<button type="button" data-choice="skip"><strong>기본 마인크래프트로 설치</strong><br><small>플랫폼은 설치하지 않고 바닐라로 진행합니다.</small></button>' +
     '</div>' +
-    '<div class="actionRow"><span></span><button class="primaryBtn" id="next" disabled>다음</button></div>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next" disabled>다음</button></div>'
 
   var nextBtn = host.querySelector('#next')
   var choiceButtons = host.querySelectorAll('[data-choice]')
@@ -462,19 +529,22 @@ function renderSubStep41(host, pack, done) {
     applyChoice(state.client.installPlatform ? 'install' : 'skip')
   }
 
+  host.querySelector('#back').addEventListener('click', back)
   nextBtn.addEventListener('click', done)
 }
 
-function renderSubStep42(host, done) {
+function renderSubStep42(host, back, done) {
   host.innerHTML =
     '<h3>4-2. 모드/리소스팩 다운로드 및 launcher_profiles 갱신</h3>' +
     '<p class="formMessage">%appdata%\\.mc_custom 에 모드와 리소스팩을 설치하고, launcher_profiles.json에 프로필을 등록합니다.</p>' +
     '<button class="primaryBtn" id="run">설치 시작</button>' +
     '<div class="formMessage" id="msg"></div>' +
-    '<div class="actionRow"><span></span><button class="primaryBtn" id="next" hidden>다음</button></div>'
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next" disabled>다음</button></div>'
   var runBtn = host.querySelector('#run')
   var msg = host.querySelector('#msg')
   var nextBtn = host.querySelector('#next')
+  if (state.client.clientInstalled) nextBtn.disabled = false
+  host.querySelector('#back').addEventListener('click', back)
   runBtn.addEventListener('click', async function () {
     runBtn.disabled = true
     msg.textContent = '설치 중...'
@@ -486,7 +556,8 @@ function renderSubStep42(host, done) {
       })
       msg.textContent = '클라이언트 설치 완료.'
       msg.classList.add('success')
-      nextBtn.hidden = false
+      state.client.clientInstalled = true
+      nextBtn.disabled = false
     } catch (err) {
       msg.textContent = '설치 실패: ' + err.message
       msg.classList.add('error')
@@ -496,9 +567,13 @@ function renderSubStep42(host, done) {
   nextBtn.addEventListener('click', done)
 }
 
-function renderSubStep43(host, done) {
-  host.innerHTML = '<h3>4-3. 완료 확인</h3><p class="formMessage">모드와 리소스팩이 .mc_custom에 설치되어 있고, launcher_profiles.json도 갱신되었습니다.</p><button class="primaryBtn" id="confirm">5단계로</button>'
-  host.querySelector('#confirm').addEventListener('click', done)
+function renderSubStep43(host, back, done) {
+  host.innerHTML =
+    '<h3>4-3. 완료 확인</h3>' +
+    '<p class="formMessage">모드와 리소스팩이 .mc_custom에 설치되어 있고, launcher_profiles.json도 갱신되었습니다.</p>' +
+    '<div class="actionRow"><button class="secondaryBtn" id="back">이전</button><button class="primaryBtn" id="next">5단계로</button></div>'
+  host.querySelector('#back').addEventListener('click', back)
+  host.querySelector('#next').addEventListener('click', done)
 }
 
 function renderStep5() {

installer/styles.css

@@ -155,6 +155,67 @@ main {
 
 .toggleRow { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
 
+.modalOverlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.6);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.modalCard {
+  background: var(--bg-alt);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  width: min(720px, 92vw);
+  max-height: 86vh;
+  display: grid;
+  grid-template-rows: auto 1fr auto;
+  overflow: hidden;
+}
+
+.modalCard > header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border);
+}
+
+.modalCard > header h3 { margin: 0; font-size: 16px; }
+.modalClose { background: transparent; border: none; color: var(--text-muted); font-size: 22px; cursor: pointer; }
+.modalClose:hover { color: var(--text); }
+
+.modalBody {
+  padding: 16px;
+  overflow-y: auto;
+}
+
+.modalCard > footer { padding: 12px 16px; border-top: 1px solid var(--border); margin: 0; }
+
+.eulaPre {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 12px;
+  font-family: 'Consolas', monospace;
+  font-size: 12px;
+  white-space: pre-wrap;
+  word-break: break-word;
+  max-height: 50vh;
+  overflow-y: auto;
+}
+
+.eulaFrame {
+  width: 100%;
+  height: 50vh;
+  background: white;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+}
+
 .statusBadge { display: inline-flex; padding: 3px 10px; border-radius: 999px; font-size: 12px; }
 .statusBadge.pending { background: #2c3849; color: var(--text-muted); }
 .statusBadge.ok { background: rgba(63, 185, 80, 0.2); color: var(--success); }

src/installer/main.ts

@@ -295,11 +295,30 @@ ipcMain.handle('server:install', async (_event, payload: ServerInstallPayload) =
   sendLog(`서버 설치 경로: ${installPath}`)
 
   await downloadServerZip(pack.pack, installPath)
+  // 다운로드한 zip에 들어있을 수 있는 eula.txt를 그대로 보존한다.
+  // 동의 흐름은 renderer가 별도 IPC로 읽고 동의 시 덮어쓴다.
+})
 
-  const eulaPath = path.join(installPath, 'eula.txt')
-  if (fs.existsSync(eulaPath)) {
-    await fsp.unlink(eulaPath)
-    sendLog('기존 eula.txt 삭제, 사용자 동의를 다시 받습니다.')
+ipcMain.handle('server:readEula', async (_event, installPath: string): Promise<{ exists: boolean; content: string }> => {
+  if (!installPath) return { exists: false, content: '' }
+  const target = path.join(path.resolve(installPath), 'eula.txt')
+  try {
+    const content = await fsp.readFile(target, 'utf8')
+    return { exists: true, content }
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code === 'ENOENT') return { exists: false, content: '' }
+    throw error
+  }
+})
+
+ipcMain.handle('server:fetchMinecraftEula', async (): Promise<{ url: string; html: string }> => {
+  const url = 'https://www.minecraft.net/en-us/eula'
+  try {
+    const buffer = await fetchBuffer(url)
+    return { url, html: buffer.toString('utf8') }
+  } catch (error) {
+    sendLog(`Minecraft EULA 페이지 조회 실패: ${(error as Error).message}`)
+    return { url, html: '' }
   }
 })
 

src/installer/preload.ts

@@ -19,6 +19,10 @@ const api = {
   // 3-3
   startServerInstall: (payload: ServerInstallPayload): Promise<void> =>
     ipcRenderer.invoke('server:install', payload),
+  readEula: (installPath: string): Promise<{ exists: boolean; content: string }> =>
+    ipcRenderer.invoke('server:readEula', installPath),
+  fetchMinecraftEula: (): Promise<{ url: string; html: string }> =>
+    ipcRenderer.invoke('server:fetchMinecraftEula'),
   acceptEula: (installPath: string): Promise<void> =>
     ipcRenderer.invoke('server:acceptEula', installPath),
   checkRam: (packKey: string): Promise<RamCheckResult> =>