diff --git a/api/src/index.js b/api/src/index.js
index 0e0519b..f8cb7ea 100644
--- a/api/src/index.js
+++ b/api/src/index.js
@@ -26,7 +26,7 @@ const corsOrigins = process.env.CORS_ORIGINS
     : true;
 
 app.use(cors({ origin: corsOrigins, credentials: true }));
-app.use(express.json({ limit: '15mb' }));
+app.use(express.json({ limit: '20mb' }));
 
 app.get('/api/v1/health', (_req, res) => {
     res.json({ ok: true, version: '4.0.0' });
@@ -37,6 +37,11 @@ app.use('/api/v1/decks', createDecksRouter(db));
 app.use('/api/v1/admin', createAdminRouter(db));
 
 app.use((err, _req, res, _next) => {
+    if (err.type === 'entity.too.large') {
+        return res.status(413).json({
+            error: '요청 크기가 너무 큽니다. 고화질 옵션을 끄고 다시 저장해 주세요.',
+        });
+    }
     console.error(err);
     res.status(500).json({ error: '서버 오류가 발생했습니다.' });
 });
diff --git a/cardList.html b/cardList.html
index 617c214..b8661a4 100644
--- a/cardList.html
+++ b/cardList.html
@@ -83,7 +83,7 @@
             </div>
 
             <div class="sticky top-0 z-50 h-16 bg-white/80 backdrop-blur-md border-b px-4 py-3 flex justify-between items-center">
-                <button type="button" onclick="goToHome()" class="font-bold text-slate-600 hover:text-blue-600 cursor-pointer">← 홈</button>
+                <button type="button" id="i18n-home" onclick="goToHome()" class="font-bold text-slate-600 hover:text-blue-600 cursor-pointer">← 홈</button>
                 <div class="font-bold text-slate-800">
                     <span id="i18n-searchResults">검색결과</span>
                     :
@@ -478,6 +478,7 @@
                             };
 
                             safeSet('i18n-back', 'back');
+                            safeSet('i18n-home', 'homeNav');
                             safeSet('i18n-searchResults', 'searchResults');
                             safeSet('i18n-resetBtn', 'resetSelection');
                             safeSet('i18n-labelSearch', 'search');
@@ -505,58 +506,89 @@
                             window.location.href = lang && lang !== 'ko' ? `/?lang=${lang}` : '/';
                         };
 
+                        /**
+                         * 동일 카드 번호 그룹 합계
+                         * @param {string} cardNumber
+                         * @returns {number}
+                         */
+                        function getNumberGroupTotal(cardNumber) {
+                            return cardList
+                                .filter((c) => c.Number === cardNumber)
+                                .reduce((sum, c) => sum + c.count, 0);
+                        }
+
+                        /**
+                         * 동일 카드 번호 그룹 최대 수량
+                         * @param {string} cardNumber
+                         * @returns {number}
+                         */
+                        function getGroupMaxCount(cardNumber) {
+                            const cards = cardList.filter((c) => c.Number === cardNumber);
+                            if (!cards.length) return 4;
+                            return Math.max(...cards.map((c) => c.maxCount || 4));
+                        }
+
+                        /**
+                         * 카드 컨테이너 조회
+                         * @param {string} imgSrc
+                         * @returns {HTMLElement|null}
+                         */
+                        function getCardContainer(imgSrc) {
+                            return document.querySelector(`.cardContainer[data-imgsrc="${CSS.escape(imgSrc)}"]`);
+                        }
+
+                        /**
+                         * 동일 번호 카드들의 +/- UI 동기화
+                         * @param {string} cardNumber
+                         */
+                        function updateCountControlsForNumber(cardNumber) {
+                            const groupTotal = getNumberGroupTotal(cardNumber);
+                            const groupAtMax = groupTotal >= getGroupMaxCount(cardNumber);
+
+                            cardList
+                                .filter((c) => c.Number === cardNumber)
+                                .forEach((sibling) => {
+                                    const container = getCardContainer(sibling.imgSrc);
+                                    if (!container) return;
+
+                                    const minusBtn = container.querySelector('.minusBtn');
+                                    const plusBtn = container.querySelector('.plusBtn');
+                                    const countSpan = container.querySelector('.countText');
+                                    const keyBtn = container.querySelector('.keyBtn');
+
+                                    if (countSpan) countSpan.textContent = sibling.count;
+
+                                    if (minusBtn) {
+                                        minusBtn.classList.toggle('invisible', sibling.count === 0);
+                                        minusBtn.classList.toggle('visible', sibling.count > 0);
+                                    }
+
+                                    if (plusBtn) {
+                                        plusBtn.classList.toggle('invisible', groupAtMax);
+                                        plusBtn.classList.toggle('visible', !groupAtMax);
+                                    }
+
+                                    if (keyBtn) {
+                                        keyBtn.className = `keyBtn w-full py-1 rounded text-[9px] lg:text-[10px] font-bold border transition-all ${sibling.key && sibling.count > 0 ? 'bg-indigo-600 border-indigo-600 text-white shadow-md' : 'bg-white border-slate-200 text-slate-400'}`;
+                                    }
+                                });
+                        }
+
                         window.handleCount = function (imgSrc, delta, event) {
                             event.stopPropagation();
                             const card = cardList.find((c) => c.imgSrc === imgSrc);
                             if (!card) return;
 
-                            // 1. 데이터 업데이트
-                            const currentTotal = cardList.filter((c) => c.Number === card.Number).reduce((s, c) => s + c.count, 0);
-                            if (delta > 0 && currentTotal < (card.maxCount || 4)) {
+                            const maxCount = getGroupMaxCount(card.Number);
+                            const currentTotal = getNumberGroupTotal(card.Number);
+                            if (delta > 0 && currentTotal < maxCount) {
                                 card.count++;
                             } else if (delta < 0 && card.count > 0) {
                                 card.count--;
                                 if (card.count === 0) card.key = false;
                             }
 
-                            // 2. UI 업데이트
-                            const container = document.querySelector(`.cardContainer[data-imgsrc="${imgSrc}"]`);
-                            if (container) {
-                                const minusBtn = container.querySelector('.minusBtn');
-                                const plusBtn = container.querySelector('.plusBtn');
-                                const countSpan = container.querySelector('.countText');
-                                const keyBtn = container.querySelector('.keyBtn'); // 클래스로 직접 참조
-
-                                if (countSpan) countSpan.textContent = card.count;
-
-                                // 마이너스 버튼 제어
-                                if (minusBtn) {
-                                    if (card.count > 0) {
-                                        minusBtn.classList.remove('invisible');
-                                        minusBtn.classList.add('visible');
-                                    } else {
-                                        minusBtn.classList.remove('visible');
-                                        minusBtn.classList.add('invisible');
-                                    }
-                                }
-
-                                // 플러스 버튼 제어 (isMax 결과에 따라 즉시 반영)
-                                if (plusBtn) {
-                                    if (isMax(card)) {
-                                        plusBtn.classList.remove('visible');
-                                        plusBtn.classList.add('invisible');
-                                    } else {
-                                        plusBtn.classList.remove('invisible');
-                                        plusBtn.classList.add('visible');
-                                    }
-                                }
-
-                                // 키 버튼 상태 업데이트
-                                if (keyBtn) {
-                                    keyBtn.className = `keyBtn w-full py-1 rounded text-[9px] lg:text-[10px] font-bold border transition-all ${card.key && card.count > 0 ? 'bg-indigo-600 border-indigo-600 text-white shadow-md' : 'bg-white border-slate-200 text-slate-400'}`;
-                                }
-                            }
-
+                            updateCountControlsForNumber(card.Number);
                             syncToStorageAndCounters();
                         };
 
@@ -585,7 +617,7 @@
                         };
 
                         function isMax(card) {
-                            return cardList.filter((c) => c.Number === card.Number).reduce((s, c) => s + c.count, 0) >= (card.maxCount || 4);
+                            return getNumberGroupTotal(card.Number) >= getGroupMaxCount(card.Number);
                         }
 
                         function updateCardList() {
diff --git a/deckHistory.html b/deckHistory.html
index 49c38d8..5e1112a 100644
--- a/deckHistory.html
+++ b/deckHistory.html
@@ -26,41 +26,95 @@
             <div class="app-body-layout">
                 <main class="app-main deck-history-main">
             <header class="deck-history-header">
-                <h1>내 덱 관리</h1>
-                <p>저장한 덱 목록입니다. 공개 전환 시「공개 덱」목록에 표시됩니다.</p>
+                <div class="page-title-row">
+                    <h1 data-i18n="deckHistoryTitle">내 덱 관리</h1>
+                    <button type="button" class="page-help-btn" data-i18n-tooltip="deckHistoryDesc" aria-expanded="false">?</button>
+                </div>
             </header>
 
             <div id="deck-toolbar" class="deck-history-toolbar hidden">
-                <input
-                    type="search"
-                    id="deck-search"
-                    class="deck-search-input"
-                    placeholder="덱 이름 또는 시리즈 검색..."
-                    autocomplete="off"
-                />
-                <select id="deck-series-filter" class="deck-series-select" aria-label="시리즈 필터">
-                    <option value="">모든 시리즈</option>
-                </select>
-                <span id="deck-count" class="deck-count-label"></span>
+                <div class="deck-toolbar-fav-row">
+                    <button type="button" id="deck-favorite-filter" class="deck-favorite-filter" aria-pressed="false">
+                        <span class="deck-favorite-filter-icon deck-star-icon" aria-hidden="true"></span>
+                        <span data-i18n="deckFavoriteFilterOnly">즐겨찾기만 보기</span>
+                        <span id="deck-fav-count" class="deck-fav-count"></span>
+                    </button>
+                </div>
+                <div class="deck-toolbar-main-row">
+                    <input
+                        type="search"
+                        id="deck-search"
+                        class="deck-search-input"
+                        data-i18n-placeholder="deckSearchPlaceholder"
+                        placeholder="덱 이름 또는 시리즈 검색..."
+                        autocomplete="off"
+                    />
+                    <select id="deck-series-filter" class="deck-series-select" aria-label="시리즈 필터">
+                        <option value="">모든 시리즈</option>
+                    </select>
+                    <span id="deck-count" class="deck-count-label"></span>
+                </div>
             </div>
 
             <div id="deck-list">
-                <div class="deck-status-message">불러오는 중...</div>
+                <div class="deck-status-message" data-i18n="deckLoading">불러오는 중...</div>
             </div>
                 </main>
 
                 <aside class="app-ad-rail" aria-label="광고">
-                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar"></div>
+                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar">
+                        <ins
+                            class="adsbygoogle"
+                            style="display: block"
+                            data-ad-client="ca-pub-4516420168710424"
+                            data-ad-slot="4260332296"
+                            data-ad-format="auto"
+                            data-full-width-responsive="true"
+                        ></ins>
+                    </div>
                 </aside>
             </div>
         </div>
 
         <script src="/script/api.js"></script>
+        <script src="/script/ads.js"></script>
+        <script src="/script/deck-favorites.js"></script>
+        <script src="/script/deck-preview-hold.js"></script>
+        <script src="/script/page-i18n.js"></script>
+        <script src="/script/page-help.js"></script>
         <script src="/script/auth-header.js"></script>
         <script>
             /** @type {Array<object>} */
             let allDecks = [];
 
+            /**
+             * @param {string} key
+             * @param {string} fallback
+             * @returns {string}
+             */
+            function t(key, fallback) {
+                return window.UaPageI18n?.t(key, fallback) || fallback;
+            }
+
+            /**
+             * @param {number} filtered
+             * @param {number} total
+             * @returns {string}
+             */
+            function formatDeckCount(filtered, total) {
+                return t('deckCountFormat', '{filtered} / {total}개')
+                    .replace('{filtered}', String(filtered))
+                    .replace('{total}', String(total));
+            }
+
+            /**
+             * 미리보기 없음 플레이스홀더 HTML
+             * @returns {string}
+             */
+            function noPreviewHtml() {
+                return `<div class="deck-card-preview-placeholder">${escapeHtml(t('deckNoPreview', '미리보기 없음'))}<br><span>${escapeHtml(t('deckResaveHint', 'Preview에서 다시 저장'))}</span></div>`;
+            }
+
             /**
              * HTML 이스케이프
              * @param {string} str
@@ -80,7 +134,7 @@
              * @returns {string}
              */
             function getDeckTitle(deck) {
-                return deck.name || deck.series_name || deck.series || '이름 없음';
+                return deck.name || deck.series_name || deck.series || t('deckUntitled', '이름 없음');
             }
 
             /**
@@ -103,7 +157,7 @@
                 );
 
                 select.innerHTML =
-                    '<option value="">모든 시리즈</option>' +
+                    `<option value="">${escapeHtml(t('deckAllSeries', '모든 시리즈'))}</option>` +
                     sorted
                         .map(
                             ([key, label]) =>
@@ -123,8 +177,11 @@
             function getFilteredDecks() {
                 const query = document.getElementById('deck-search').value.trim().toLowerCase();
                 const series = document.getElementById('deck-series-filter').value;
+                const favOnly =
+                    document.getElementById('deck-favorite-filter')?.getAttribute('aria-pressed') === 'true';
 
                 return allDecks.filter((d) => {
+                    if (favOnly && !UaDeckFavorites.isFavorite(d.share_code)) return false;
                     if (series && d.series !== series) return false;
                     if (!query) return true;
 
@@ -142,6 +199,43 @@
                 });
             }
 
+            /**
+             * 즐겨찾기 개수
+             * @returns {number}
+             */
+            function countFavorites() {
+                return allDecks.filter((d) => UaDeckFavorites.isFavorite(d.share_code)).length;
+            }
+
+            /**
+             * 즐겨찾기 개수 라벨 갱신
+             */
+            function updateFavCount() {
+                const el = document.getElementById('deck-fav-count');
+                if (!el) return;
+                const n = countFavorites();
+                el.textContent = n > 0 ? String(n) : '';
+            }
+
+            /**
+             * 즐겨찾기 버튼 HTML
+             * @param {string} shareCode
+             * @returns {string}
+             */
+            function favoriteButtonHtml(shareCode) {
+                const on = UaDeckFavorites.isFavorite(shareCode);
+                const cls = on ? 'deck-card-btn-favorite is-on' : 'deck-card-btn-favorite';
+                const starCls = on ? 'deck-star-icon is-on' : 'deck-star-icon';
+                return `<button type="button" class="deck-card-btn ${cls}" data-favorite="${escapeHtml(shareCode)}" aria-pressed="${on ? 'true' : 'false'}" aria-label="${escapeHtml(t('deckFavorite', '즐겨찾기'))}"><span class="${starCls}" aria-hidden="true"></span>${escapeHtml(t('deckFavorite', '즐겨찾기'))}</button>`;
+            }
+
+            function getPreviewSrc(d) {
+                if (!d.preview_url) return null;
+                const src = UaDeckApi.resolveMediaUrl(d.preview_url);
+                const version = d.updated_at ? `?v=${encodeURIComponent(d.updated_at)}` : '';
+                return src + version;
+            }
+
             /**
              * 미리보기 HTML
              * @param {object} d
@@ -149,12 +243,12 @@
              * @returns {string}
              */
             function renderPreviewHtml(d, title) {
-                if (!d.preview_url) {
-                    return '<div class="deck-card-preview-placeholder">미리보기 없음<br><span>Preview에서 다시 저장</span></div>';
+                const previewSrc = getPreviewSrc(d);
+                if (!previewSrc) {
+                    return `<div class="deck-card-preview"><div class="deck-card-preview-placeholder">${escapeHtml(t('deckNoPreview', '미리보기 없음'))}<br><span>${escapeHtml(t('deckResaveHint', 'Preview에서 다시 저장'))}</span></div></div>`;
                 }
-                const src = UaDeckApi.resolveMediaUrl(d.preview_url);
-                const version = d.updated_at ? `?v=${encodeURIComponent(d.updated_at)}` : '';
-                return `<img src="${escapeHtml(src + version)}" alt="${title} 미리보기" loading="lazy" class="deck-card-preview-img" />`;
+                const holdAttrs = `data-hold-preview data-preview-src="${escapeHtml(previewSrc)}"`;
+                return `<div class="deck-card-preview deck-card-preview--holdable" ${holdAttrs}><img src="${escapeHtml(previewSrc)}" alt="${escapeHtml(title)} 미리보기" loading="lazy" class="deck-card-preview-img" draggable="false" /></div>`;
             }
 
             /**
@@ -166,36 +260,55 @@
                 const title = escapeHtml(getDeckTitle(d));
                 const seriesLabel = escapeHtml(d.series_name || d.series);
                 const date = new Date(d.updated_at).toLocaleDateString('ko-KR');
-                const preview = renderPreviewHtml(d, title);
                 const isPublic = Boolean(d.is_public);
                 const visibilityBadge = isPublic
-                    ? '<span class="deck-card-badge-public">공개</span>'
-                    : '<span class="deck-card-badge-private">비공개</span>';
-                const toggleLabel = isPublic ? '비공개 전환' : '공개 전환';
-                const toggleClass = isPublic ? 'deck-card-btn-toggle is-public' : 'deck-card-btn-toggle';
+                    ? `<span class="deck-card-badge-public">${escapeHtml(t('deckBadgePublic', '공개'))}</span>`
+                    : `<span class="deck-card-badge-private">${escapeHtml(t('deckBadgePrivate', '비공개'))}</span>`;
+                const toggleLabel = isPublic
+                    ? t('deckMakePrivate', '비공개 전환')
+                    : t('deckMakePublic', '공개 전환');
+                const favClass = UaDeckFavorites.isFavorite(d.share_code) ? 'deck-card is-favorite' : 'deck-card';
 
                 return `
-                    <article class="deck-card" data-code="${escapeHtml(d.share_code)}">
-                        <div class="deck-card-preview">${preview}</div>
+                    <article class="${favClass}" data-code="${escapeHtml(d.share_code)}">
+                        ${renderPreviewHtml(d, title)}
                         <div class="deck-card-body">
                             <div class="deck-card-visibility">
                                 <span class="deck-card-series">${seriesLabel}</span>
                                 ${visibilityBadge}
                             </div>
                             <h2 class="deck-card-title">${title}</h2>
-                            <div class="deck-card-meta">조회 ${d.view_count} · ${date}</div>
-                            <div class="deck-card-actions">
-                                <button type="button" class="deck-card-btn deck-card-btn-load" data-load="${escapeHtml(d.share_code)}" data-series="${escapeHtml(d.series)}" data-name="${escapeHtml(d.series_name || '')}">불러오기</button>
-                                <button type="button" class="deck-card-btn ${toggleClass}" data-toggle="${escapeHtml(d.share_code)}" data-public="${isPublic ? '1' : '0'}">${toggleLabel}</button>
-                            </div>
-                            <div class="deck-card-actions">
-                                <button type="button" class="deck-card-btn deck-card-btn-copy" data-copy="${escapeHtml(d.share_code)}">링크 복사</button>
-                                <button type="button" class="deck-card-btn deck-card-btn-delete" data-delete="${escapeHtml(d.share_code)}" title="삭제" aria-label="삭제">삭제</button>
+                            <div class="deck-card-meta">${escapeHtml(t('deckViews', '조회'))} ${d.view_count} · ${date}</div>
+                            <div class="deck-card-actions deck-card-actions--primary">
+                                ${favoriteButtonHtml(d.share_code)}
+                                <button type="button" class="deck-card-btn deck-card-btn-load" data-load="${escapeHtml(d.share_code)}" data-series="${escapeHtml(d.series)}" data-name="${escapeHtml(d.series_name || '')}">${escapeHtml(t('deckLoad', '불러오기'))}</button>
+                                <div class="deck-card-more-wrap">
+                                    <button type="button" class="deck-card-more-btn" aria-haspopup="true" aria-expanded="false" aria-label="${escapeHtml(t('deckMoreActions', '더 보기'))}">
+                                        <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor" aria-hidden="true"><circle cx="8" cy="3" r="1.5"/><circle cx="8" cy="8" r="1.5"/><circle cx="8" cy="13" r="1.5"/></svg>
+                                    </button>
+                                    <div class="deck-card-more-menu hidden" role="menu">
+                                        <button type="button" class="deck-card-more-item" role="menuitem" data-copy="${escapeHtml(d.share_code)}">${escapeHtml(t('deckCopyLink', '링크 복사'))}</button>
+                                        <button type="button" class="deck-card-more-item" role="menuitem" data-toggle="${escapeHtml(d.share_code)}" data-public="${isPublic ? '1' : '0'}">${escapeHtml(toggleLabel)}</button>
+                                        <button type="button" class="deck-card-more-item deck-card-more-item--danger" role="menuitem" data-delete="${escapeHtml(d.share_code)}">${escapeHtml(t('deckDelete', '삭제'))}</button>
+                                    </div>
+                                </div>
                             </div>
                         </div>
                     </article>`;
             }
 
+            /**
+             * 열린 더보기 메뉴 닫기
+             */
+            function closeAllDeckMenus() {
+                document.querySelectorAll('.deck-card-more-menu').forEach((menu) => {
+                    menu.classList.add('hidden');
+                });
+                document.querySelectorAll('.deck-card-more-btn').forEach((btn) => {
+                    btn.setAttribute('aria-expanded', 'false');
+                });
+            }
+
             /**
              * 목록 렌더링
              */
@@ -204,22 +317,32 @@
                 const countEl = document.getElementById('deck-count');
                 const filtered = getFilteredDecks();
 
-                countEl.textContent = `${filtered.length} / ${allDecks.length}개`;
+                countEl.textContent = formatDeckCount(filtered.length, allDecks.length);
+                updateFavCount();
 
                 if (!filtered.length) {
+                    const favOnly =
+                        document.getElementById('deck-favorite-filter')?.getAttribute('aria-pressed') === 'true';
+                    const emptyMsg = favOnly
+                        ? t('deckNoFavorites', '즐겨찾기한 덱이 없습니다.')
+                        : t('deckNoMatch', '조건에 맞는 덱이 없습니다.');
                     list.innerHTML =
-                        '<div class="deck-grid"><div class="deck-grid-empty">조건에 맞는 덱이 없습니다.</div></div>';
+                        `<div class="deck-grid"><div class="deck-grid-empty">${escapeHtml(emptyMsg)}</div></div>`;
                     return;
                 }
 
                 list.innerHTML = `<div class="deck-grid">${filtered.map(renderDeckCard).join('')}</div>`;
+                closeAllDeckMenus();
+                UaDeckPreviewHold.bindHoldPreview(list);
 
                 list.querySelectorAll('.deck-card-preview-img').forEach((img) => {
                     img.addEventListener('error', () => {
                         const wrap = img.closest('.deck-card-preview');
                         if (wrap) {
-                            wrap.innerHTML =
-                                '<div class="deck-card-preview-placeholder">미리보기 없음<br><span>Preview에서 다시 저장</span></div>';
+                            wrap.classList.remove('deck-card-preview--holdable');
+                            wrap.removeAttribute('data-hold-preview');
+                            wrap.removeAttribute('data-preview-src');
+                            wrap.innerHTML = noPreviewHtml();
                         }
                     });
                 });
@@ -244,7 +367,7 @@
                     if (!decks.length) {
                         toolbar.classList.add('hidden');
                         list.innerHTML =
-                            '<div class="deck-status-message">저장된 덱이 없습니다.</div>';
+                            `<div class="deck-status-message">${escapeHtml(t('deckEmpty', '저장된 덱이 없습니다.'))}</div>`;
                         return;
                     }
 
@@ -257,13 +380,49 @@
                 }
             }
 
-            document.addEventListener('DOMContentLoaded', () => {
+            document.addEventListener('DOMContentLoaded', async () => {
+                if (window.UaPageI18n?.applyPageI18n) {
+                    await window.UaPageI18n.applyPageI18n();
+                }
                 loadDecks();
 
                 document.getElementById('deck-search').addEventListener('input', renderDeckList);
                 document.getElementById('deck-series-filter').addEventListener('change', renderDeckList);
 
+                const favFilterBtn = document.getElementById('deck-favorite-filter');
+                const favFilterIcon = favFilterBtn.querySelector('.deck-star-icon');
+                favFilterBtn.addEventListener('click', () => {
+                    const on = favFilterBtn.getAttribute('aria-pressed') !== 'true';
+                    favFilterBtn.setAttribute('aria-pressed', on ? 'true' : 'false');
+                    favFilterIcon.classList.toggle('is-on', on);
+                    renderDeckList();
+                });
+
                 document.getElementById('deck-list').addEventListener('click', async (e) => {
+                    const moreBtn = e.target.closest('.deck-card-more-btn');
+                    if (moreBtn) {
+                        e.stopPropagation();
+                        const menu = moreBtn.parentElement?.querySelector('.deck-card-more-menu');
+                        const isOpen = menu && !menu.classList.contains('hidden');
+                        closeAllDeckMenus();
+                        if (!isOpen && menu) {
+                            menu.classList.remove('hidden');
+                            moreBtn.setAttribute('aria-expanded', 'true');
+                        }
+                        return;
+                    }
+
+                    if (!e.target.closest('.deck-card-more-wrap')) {
+                        closeAllDeckMenus();
+                    }
+
+                    const favBtn = e.target.closest('[data-favorite]');
+                    if (favBtn) {
+                        UaDeckFavorites.toggle(favBtn.dataset.favorite);
+                        renderDeckList();
+                        return;
+                    }
+
                     const loadBtn = e.target.closest('[data-load]');
                     if (loadBtn) {
                         const code = loadBtn.dataset.load;
@@ -277,7 +436,8 @@
                     if (copyBtn) {
                         const url = `${location.origin}/d/${copyBtn.dataset.copy}`;
                         await navigator.clipboard.writeText(url);
-                        alert('공유 링크가 복사되었습니다.');
+                        closeAllDeckMenus();
+                        alert(t('deckLinkCopied', '공유 링크가 복사되었습니다.'));
                         return;
                     }
 
@@ -285,24 +445,28 @@
                     if (toggleBtn) {
                         const code = toggleBtn.dataset.toggle;
                         const nextPublic = toggleBtn.dataset.public !== '1';
-                        const label = nextPublic ? '이 덱을 공개 덱 목록에 표시합니다. 계속할까요?' : '비공개로 전환합니다. 공개 목록에서 숨겨집니다.';
+                        const label = nextPublic
+                            ? t('deckMakePublicConfirm', '이 덱을 공개 덱 목록에 표시합니다. 계속할까요?')
+                            : t('deckMakePrivateConfirm', '비공개로 전환합니다. 공개 목록에서 숨겨집니다.');
                         if (!confirm(label)) return;
                         await UaDeckApi.updateDeck(code, { isPublic: nextPublic });
                         const deck = allDecks.find((d) => d.share_code === code);
                         if (deck) deck.is_public = nextPublic ? 1 : 0;
+                        closeAllDeckMenus();
                         renderDeckList();
                         return;
                     }
 
                     const deleteBtn = e.target.closest('[data-delete]');
                     if (deleteBtn) {
-                        if (!confirm('이 덱을 삭제하시겠습니까?')) return;
+                        closeAllDeckMenus();
+                        if (!confirm(t('deckDeleteConfirm', '이 덱을 삭제하시겠습니까?'))) return;
                         await UaDeckApi.deleteDeck(deleteBtn.dataset.delete);
                         allDecks = allDecks.filter((d) => d.share_code !== deleteBtn.dataset.delete);
                         if (!allDecks.length) {
                             document.getElementById('deck-toolbar').classList.add('hidden');
                             document.getElementById('deck-list').innerHTML =
-                                '<div class="deck-status-message">저장된 덱이 없습니다.</div>';
+                                `<div class="deck-status-message">${escapeHtml(t('deckEmpty', '저장된 덱이 없습니다.'))}</div>`;
                             return;
                         }
                         populateSeriesFilter(allDecks);
diff --git a/docs/map.md b/docs/map.md
index 383ce35..19df93f 100644
--- a/docs/map.md
+++ b/docs/map.md
@@ -24,19 +24,23 @@
 
 ## `/login.html`, `/signup.html`
 - 인증 화면
+- 연결: `script/page-i18n.js` (`data-i18n` 속성)
 
 ## `/profile.html` (내 프로필)
 - 로그인 사용자: 이메일·사용자명·프로필 사진·비밀번호 변경
-- 연결: `script/api.js` (`updateProfile`, `changePassword`), `script/image-utils.js`, `style/profile.css`
+- 연결: `script/api.js` (`updateProfile`, `changePassword`), `script/image-utils.js`, `script/page-i18n.js`, `script/ads.js`, `style/profile.css`
 
 ## `/deckHistory.html`
 - 로그인 사용자의 저장 덱 목록·불러오기·삭제
-- 카드 그리드 + 미리보기 썸네일 (`preview_url`)
+- 카드 그리드 + 미리보기 썸네일 (`preview_url`), 클릭·길게 눌러 확대 (`deck-preview-hold.js`)
 - 시리즈 필터·검색 (`style/deck-history.css`)
+- 연결: `script/page-i18n.js`, `script/ads.js` (우측 AdSense `4260332296`)
 
 ## `/preset.html` (공개 덱)
 - 사용자가 공개 전환한 덱 목록 (카드 그리드)
+- 썸네일 클릭·길게 눌러 확대 (`deck-preview-hold.js`, 안내 문구 없음)
 - API: `GET /api/v1/decks/presets` → `is_public=1` user 덱
+- 연결: `script/page-i18n.js`, `script/ads.js`
 
 ## `/admin.html`
 - 관리자: 회원 관리, 덱 관리 (`style/admin.css`)
@@ -47,7 +51,12 @@
 
 ## 공통
 - `style/app-shell.css`: 헤더·본문 최대 너비 1280px (`max-w-7xl`), 데스크톱 우측 광고 레일
+- `script/ads.js`: Google AdSense `ins.adsbygoogle` 슬롯 초기화
+- `script/page-help.js`: 페이지 제목 `?` 툴팁
+- `script/page-i18n.js`: `data-i18n` / `data-i18n-html` / `data-i18n-placeholder`, `UaPageI18n.t()`
+- `script/deck-favorites.js`: 덱 즐겨찾기 (localStorage)
+- `script/deck-preview-hold.js`: 덱 썸네일 클릭·길게 눌러 확대 (내 덱·공개 덱)
 - `script/api.js`: API 클라이언트 (`updateProfile`, `changePassword` 포함)
-- `script/auth-header.js`: 헤더 프로필 드롭다운 (내 프로필, 내 덱 관리, 공개 덱), 로그인 시 아바타 옆 사용자명 표시
+- `script/auth-header.js`: 헤더 프로필 드롭다운 (i18n), 로그인 시 **썸네일 옆 닉네임** 표시 (`auth-profile-trigger`)
 - `script/image-utils.js`: 클라이언트 이미지 PNG 리사이즈 (`UaImageUtils.resizeImageToPng`)
 - `style/auth-header.css`
diff --git a/docs/todo.md b/docs/todo.md
index c5faaac..cde9d5f 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -21,7 +21,11 @@
 - [ ] `.env` 설정 및 기존 리버스 프록시 연동
 - [ ] 옆 프로젝트에 `integrations/uadeck-deck-client.js` 적용
 - [ ] `cardList.html` 인라인 스크립트 모듈 분리
-- [ ] i18n 번역 키 추가 (auth, admin 문구)
+- [x] i18n: 모달·홈 버튼·auth·덱 관리·프로필·로그인/가입 3개국어 (v4.0.0 후속)
+- [x] 덱 즐겨찾기·필터 (내 덱·공개 덱)
+- [x] 공개 덱: 홀드 미리보기 + 하단 즐겨찾기/불러오기 버튼
+- [x] 내 덱: 썸네일 클릭·홀드 확대, 저장 썸네일 1200px 정규화
+- [ ] i18n: `admin.html` 문구
 
 ## v4.0.0 최근 완료
 - [x] `profile.html`: 일반 사용자 프로필 화면 (아바타·닉네임·이메일·비밀번호)
diff --git a/docs/update.md b/docs/update.md
index 679bb6a..b0865eb 100644
--- a/docs/update.md
+++ b/docs/update.md
@@ -1,5 +1,85 @@
 # 업데이트 이력
 
+## 2026-06-19 / v4.0.0 — 덱 썸네일 미리보기·저장 크기 통일
+
+### 수행 작업
+- `deckHistory.html`: `deck-preview-hold.js` 연동 — 내 덱 썸네일도 클릭·길게 눌러 확대
+- `preset.html`: 썸네일 위「클릭·길게 눌러…」안내 문구 제거 (홀드 기능 유지)
+- `result.html`: 저장용 미리보기를 다운로드와 동일한 **1200px** 기준으로 정규화 (`normalizePreviewForSave`)
+  - 저장 시 HQ 옵션 무시 (`highQuality: false`) 후 너비 1200px로 스케일
+  - 기존 960px 축소만 하던 `compressPreviewForSave` 제거 → 크기 제각각이던 원인 해소
+- `style/deck-history.css`: 미사용 `.deck-card-preview-hint` 제거
+
+### 참고
+- 이미 저장된 덱 썸네일은 예전 크기 그대로이며, Preview에서 **다시 저장**하면 1200px로 갱신됨
+
+## 2026-06-19 / v4.0.0 — 덱 저장 413 수정
+
+### 원인
+- `localhost:8080` 요청은 Nginx(`client_max_body_size 2m`)를 거침
+- 덱 저장 시 미리보기 PNG(base64)가 JSON에 포함되어 2MB 초과 → **413 Request Entity Too Large**
+
+### 수행 작업
+- `nginx/default.conf`: `client_max_body_size` 2m → **25m** (API location 포함)
+- `api/src/index.js`: JSON limit 20mb, 413 전용 오류 메시지
+- `script/api.js`: 413 사용자 안내 문구
+- `result.html`: 저장용 미리보기 최대 너비 960px 리사이즈
+
+### 적용
+```bash
+npm stop && npm start
+```
+
+## 2026-06-19 / v4.0.0 — 공개 덱 미리보기 수정
+
+### 수행 작업
+- `deck-preview-hold.js`: mouseleave 즉시 닫힘 버그 수정, 클릭 고정·길게 누르기 동시 지원
+- ~~안내 문구:「클릭·길게 눌러 크게 보기」~~ → 이후 제거됨
+
+## 2026-06-19 / v4.0.0 — 프로필 덱 저장 설정 UI
+
+### 수행 작업
+- 덱 저장 설정: 설명 문단 제거 → `?` 툴팁, 설정 패널·토글 ON/OFF 표시·즉시 저장 안내 메시지
+- 토글 클릭 시 API/localStorage 동기화는 기존 `deck-prefs.js` 유지
+
+## 2026-06-19 / v4.0.0 — 메인 프로필 i18n·페이지 도움말
+
+### 수행 작업
+- `index.html`: `page-i18n.js` 로드, 언어 전환 시 `UaPageI18n` + `UaDeckAuth.refresh()`로 프로필 드롭다운 재번역
+- `script/page-help.js`: 제목 옆 `?` 버튼 클릭 시 설명 툴팁
+- `deckHistory.html`, `preset.html`, `profile.html`: 상단 설명 `<p>` 제거 → `?` 도움말 버튼
+- `style/app-shell.css`: `.page-title-row`, `.page-help-btn`, `.page-help-tooltip`
+
+## 2026-06-19 / v4.0.0 — 덱 즐겨찾기·공개 덱 미리보기
+
+### 수행 작업
+- `script/deck-favorites.js`: share_code 기준 즐겨찾기 (localStorage)
+- `script/deck-preview-hold.js`: 썸네일 길게 누르기 확대 미리보기
+- `deckHistory.html`: 카드 하단 즐겨찾기 버튼, 툴바「즐겨찾기」필터
+- `preset.html`: 카드 클릭 이동 제거 → 홀드 미리보기 + 하단「즐겨찾기」「불러오기」버튼
+- `style/deck-history.css`: 즐겨찾기·홀드 오버레이 스타일
+- i18n: `deckFavorite`, `deckFavoriteFilter`, `deckHoldPreviewHint`
+
+### 메모
+- 즐겨찾기는 브라우저 localStorage에 저장 (기기·브라우저별). 추후 계정 동기화 API 확장 가능.
+
+## 2026-06-19 / v4.0.0 — AdSense·i18n 보완
+
+### 수행 작업
+- Google AdSense 우측 슬롯(`4260332296`) 삽입: `deckHistory.html`, `preset.html`, `profile.html` `#ad-sidebar`
+- `script/ads.js`: `ins.adsbygoogle` 초기화 헬퍼
+- `script/page-i18n.js`: `data-i18n` / `data-i18n-html` / `data-i18n-placeholder` + `UaPageI18n.t()` 헬퍼
+- `script/auth-header.js`: 드롭다운 메뉴 3개국어(ko/en/ja)
+- `login.html`, `signup.html`, `profile.html`, `deckHistory.html`, `preset.html` 정적 문구 i18n 연결
+- `cardList.html`: `← 홈` 버튼 `homeNav` 키 적용
+- `result.html`: 저장 모달·로딩 확인·홈 버튼 기존 `applyTranslationsToUI` 유지, `page-i18n`으로 헤더 메뉴 번역
+- `deckHistory.html` / `preset.html`: 목록·버튼·확인 대화상자 동적 문구 i18n
+- `i18n/translations.{ko,en,ja}.json`: auth·덱 관리·프로필·공개 덱 관련 키 추가
+
+### 확인
+- `?lang=en` 또는 `?lang=ja` 로 각 페이지 문구 전환 확인
+- AdSense는 로컬/비승인 도메인에서는 빈 슬롯으로 보일 수 있음
+
 ## 2026-06-19 / v4.0.0
 
 ### 수행 작업
@@ -92,6 +172,13 @@
 - 프로필 폼은 콘텐츠 영역 내 `max-width: 42rem` 유지
 - `auth-pages.css`, `admin.css` 너비도 80rem으로 통일
 
+### 후속 UI
+- `result.html` 저장 모달 토글: Tailwind `translate-x-6` 미빌드 → 전용 `.save-deck-switch` CSS
+- `result.html` 하단 버튼 비율: 홈 0.5 · 다운로드 0.5 · 내 덱 저장 2
+- `result.html` 덱 저장: 브라우저 alert 제거 → 로딩 모달 완료 메시지 후 홈 이동
+- `signup.html`: 비밀번호 확인 필드, 가입 후 홈(`/`) 이동
+- `cardList.html`: 동일 카드 번호(패러랠 포함) 수량 공유 시 +/- 버튼 UI 동기화
+
 ## 2026-06-19 / v4.0.0 — 덱 썸네일 수정
 
 ### 수행 작업
diff --git a/i18n/translations.en.json b/i18n/translations.en.json
index b392b63..705a227 100644
--- a/i18n/translations.en.json
+++ b/i18n/translations.en.json
@@ -44,6 +44,106 @@
     "back": "BACK",
     "saveError": "Failed to save image",
 
+    "goHome": "Home",
+    "downloadImageLabel": "Download Image",
+    "saveToMyDeckLabel": "Save to My Deck",
+    "savePublicTitle": "Make this deck public?",
+    "savePublicDesc": "Public decks appear in the Public Decks list.",
+    "savePublicLabel": "Public",
+    "savePublicDefault": "Default: Yes",
+    "saveSkipLabel": "Don't ask again",
+    "saveSkipHint": "Your choice becomes the default",
+    "saveButton": "Save",
+    "okButton": "OK",
+    "deckSavedPublic": "Deck saved as public.",
+    "deckSavedPrivate": "Deck saved as private.",
+    "previewFailedNote": "(Preview image could not be generated)",
+    "redirectingHome": "Redirecting to home...",
+    "saveFailedTitle": "Save failed.",
+    "tryAgain": "Please try again.",
+    "noCardsToSave": "No cards to save.",
+    "homeNav": "← Home",
+
+    "authLogin": "Log in",
+    "authSignup": "Sign up",
+    "authMyProfile": "My Profile",
+    "authMyDecks": "My Decks",
+    "authPublicDecks": "Public Decks",
+    "authAdmin": "Admin",
+    "authLogout": "Log out",
+    "authAccountMenu": "Account menu",
+    "authAccountMenuNamed": "{name} account menu",
+
+    "loginPageTitle": "Log in",
+    "loginPageDesc": "Sign in to save and manage<br />your decks.",
+    "signupPageTitle": "Sign up",
+    "signupPageDesc": "Create a UADECK account to<br />save and share decks.",
+    "emailLabel": "Email",
+    "passwordLabel": "Password",
+    "usernameLabel": "Username",
+    "passwordConfirmLabel": "Confirm password",
+    "passwordConfirmPlaceholder": "Re-enter password",
+    "signupPasswordPlaceholder": "8+ characters",
+    "passwordMismatch": "Passwords do not match.",
+    "signupButton": "Create account",
+    "loginButton": "Log in",
+    "noAccount": "Don't have an account?",
+    "hasAccount": "Already have an account?",
+
+    "deckHistoryTitle": "My Decks",
+    "deckHistoryDesc": "Your saved decks. Public decks appear in the Public Decks list.",
+    "publicDecksTitle": "Public Decks",
+    "publicDecksDesc": "Decks marked public by users. Toggle visibility in My Decks.",
+
+    "profileTitle": "My Profile",
+    "profileDesc": "Update your photo, username, email, and password.",
+    "profileSave": "Save profile",
+    "profileDeckSettings": "Deck save settings",
+    "profileDeckSettingsDesc": "Default visibility when saving from the result screen.",
+    "profileDefaultPublic": "Public by default",
+    "profileDefaultPublicHint": "New saves default to public",
+    "profileAskOnSave": "Ask visibility on save",
+    "profileAskOnSaveHint": "Off uses your default without asking",
+    "profileDeckPrefsSaved": "Deck save settings applied.",
+    "profileSettingOn": "ON",
+    "profileSettingOff": "OFF",
+    "changePassword": "Change password",
+    "changePasswordButton": "Update",
+    "newPasswordLabel": "New password",
+    "confirmPasswordLabel": "Confirm new password",
+    "loadingLabel": "Loading...",
+
+    "deckSearchPlaceholder": "Search deck name or series...",
+    "deckAllSeries": "All series",
+    "deckLoading": "Loading...",
+    "deckEmpty": "No saved decks yet.",
+    "deckNoMatch": "No decks match your filters.",
+    "deckUntitled": "Untitled",
+    "deckNoPreview": "No preview",
+    "deckResaveHint": "Re-save from Preview",
+    "deckBadgePublic": "Public",
+    "deckBadgePrivate": "Private",
+    "deckMakePublic": "Make public",
+    "deckMakePrivate": "Make private",
+    "deckLoad": "Load",
+    "deckCopyLink": "Copy link",
+    "deckDelete": "Delete",
+    "deckViews": "Views",
+    "deckCountFormat": "{filtered} / {total}",
+    "publicDeckEmpty": "No public decks yet.",
+    "publicDeckSearchPlaceholder": "Search deck, series, or author...",
+    "deckLinkCopied": "Share link copied.",
+    "deckMakePublicConfirm": "Show this deck in the public list?",
+    "deckMakePrivateConfirm": "Make this deck private? It will be hidden from the public list.",
+    "deckDeleteConfirm": "Delete this deck?",
+    "deckFavorite": "Favorite",
+    "deckFavoriteFilter": "Favorites",
+    "deckFavoriteFilterOnly": "Favorites only",
+    "deckMoreActions": "More actions",
+    "deckNoFavorites": "No favorite decks yet.",
+    "deckHoldPreviewHint": "Click or hold to enlarge",
+    "pageHelpLabel": "Page help",
+
     "all": "All",
     "metaDeck": "Public Decks",
     "titlePrompt": "Please select a title",
diff --git a/i18n/translations.ja.json b/i18n/translations.ja.json
index 1b0556b..7d69e97 100644
--- a/i18n/translations.ja.json
+++ b/i18n/translations.ja.json
@@ -44,6 +44,106 @@
     "back": "戻る",
     "saveError": "画像の保存に失敗しました",
 
+    "goHome": "ホームへ",
+    "downloadImageLabel": "画像をダウンロード",
+    "saveToMyDeckLabel": "マイデックに保存",
+    "savePublicTitle": "全体に公開しますか？",
+    "savePublicDesc": "公開すると「公開デッキ」一覧に表示されます。",
+    "savePublicLabel": "公開",
+    "savePublicDefault": "初期値: はい",
+    "saveSkipLabel": "次回から表示しない",
+    "saveSkipHint": "選択した公開設定が初期値になります",
+    "saveButton": "保存",
+    "okButton": "確認",
+    "deckSavedPublic": "デッキを公開で保存しました。",
+    "deckSavedPrivate": "デッキを非公開で保存しました。",
+    "previewFailedNote": "(プレビュー画像の生成に失敗しました)",
+    "redirectingHome": "まもなくホームへ移動します。",
+    "saveFailedTitle": "保存に失敗しました。",
+    "tryAgain": "もう一度お試しください。",
+    "noCardsToSave": "保存するカードがありません。",
+    "homeNav": "← ホーム",
+
+    "authLogin": "ログイン",
+    "authSignup": "会員登録",
+    "authMyProfile": "マイプロフィール",
+    "authMyDecks": "マイデック管理",
+    "authPublicDecks": "公開デッキ",
+    "authAdmin": "管理者",
+    "authLogout": "ログアウト",
+    "authAccountMenu": "アカウントメニュー",
+    "authAccountMenuNamed": "{name} アカウントメニュー",
+
+    "loginPageTitle": "ログイン",
+    "loginPageDesc": "デッキを保存・管理するには<br />アカウントでログインしてください。",
+    "signupPageTitle": "会員登録",
+    "signupPageDesc": "UADECKアカウントを作成して<br />デッキを保存・共有しましょう。",
+    "emailLabel": "メール",
+    "passwordLabel": "パスワード",
+    "usernameLabel": "ユーザー名",
+    "passwordConfirmLabel": "パスワード確認",
+    "passwordConfirmPlaceholder": "パスワード再入力",
+    "signupPasswordPlaceholder": "8文字以上",
+    "passwordMismatch": "パスワードが一致しません。",
+    "signupButton": "登録する",
+    "loginButton": "ログイン",
+    "noAccount": "アカウントをお持ちでない方",
+    "hasAccount": "すでにアカウントをお持ちの方",
+
+    "deckHistoryTitle": "マイデック管理",
+    "deckHistoryDesc": "保存したデッキ一覧です。公開にすると「公開デッキ」に表示されます。",
+    "publicDecksTitle": "公開デッキ",
+    "publicDecksDesc": "ユーザーが公開したデッキ一覧です。マイデック管理で「公開切替」できます。",
+
+    "profileTitle": "マイプロフィール",
+    "profileDesc": "プロフィール写真・ユーザー名・メール・パスワードを変更できます。",
+    "profileSave": "プロフィール保存",
+    "profileDeckSettings": "デッキ保存設定",
+    "profileDeckSettingsDesc": "「マイデックに保存」時の公開設定の初期値です。",
+    "profileDefaultPublic": "デフォルト公開",
+    "profileDefaultPublicHint": "保存時に公開デッキへ表示",
+    "profileAskOnSave": "保存時に公開を確認",
+    "profileAskOnSaveHint": "オフにすると初期値で即保存",
+    "profileDeckPrefsSaved": "デッキ保存設定を反映しました。",
+    "profileSettingOn": "ON",
+    "profileSettingOff": "OFF",
+    "changePassword": "パスワード変更",
+    "changePasswordButton": "変更",
+    "newPasswordLabel": "新しいパスワード",
+    "confirmPasswordLabel": "新しいパスワード確認",
+    "loadingLabel": "読み込み中...",
+
+    "deckSearchPlaceholder": "デッキ名またはシリーズを検索...",
+    "deckAllSeries": "すべてのシリーズ",
+    "deckLoading": "読み込み中...",
+    "deckEmpty": "保存されたデッキがありません。",
+    "deckNoMatch": "条件に合うデッキがありません。",
+    "deckUntitled": "名称なし",
+    "deckNoPreview": "プレビューなし",
+    "deckResaveHint": "プレビュー画面から再保存",
+    "deckBadgePublic": "公開",
+    "deckBadgePrivate": "非公開",
+    "deckMakePublic": "公開にする",
+    "deckMakePrivate": "非公開にする",
+    "deckLoad": "読み込み",
+    "deckCopyLink": "リンクをコピー",
+    "deckDelete": "削除",
+    "deckViews": "閲覧",
+    "deckCountFormat": "{filtered} / {total}件",
+    "publicDeckEmpty": "公開デッキがありません。",
+    "publicDeckSearchPlaceholder": "デッキ名・シリーズ・作者を検索...",
+    "deckLinkCopied": "共有リンクをコピーしました。",
+    "deckMakePublicConfirm": "このデッキを公開リストに表示しますか？",
+    "deckMakePrivateConfirm": "非公開にします。公開リストから非表示になります。",
+    "deckDeleteConfirm": "このデッキを削除しますか？",
+    "deckFavorite": "お気に入り",
+    "deckFavoriteFilter": "お気に入り",
+    "deckFavoriteFilterOnly": "お気に入りのみ",
+    "deckMoreActions": "その他",
+    "deckNoFavorites": "お気に入りのデッキがありません。",
+    "deckHoldPreviewHint": "クリック・長押しで拡大",
+    "pageHelpLabel": "ページの説明",
+
     "all": "全て",
     "metaDeck": "公開デッキ",
     "titlePrompt": "タイトルを選択してください",
diff --git a/i18n/translations.ko.json b/i18n/translations.ko.json
index ac5195e..bd52afd 100644
--- a/i18n/translations.ko.json
+++ b/i18n/translations.ko.json
@@ -44,6 +44,106 @@
     "back": "BACK",
     "saveError": "이미지 저장 실패",
 
+    "goHome": "홈으로",
+    "downloadImageLabel": "이미지로 다운로드",
+    "saveToMyDeckLabel": "내 덱으로 저장",
+    "savePublicTitle": "모두에게 공개할까요?",
+    "savePublicDesc": "공개하면「공개 덱」목록에 표시됩니다.",
+    "savePublicLabel": "공개",
+    "savePublicDefault": "기본값: 예",
+    "saveSkipLabel": "다음부터 물어보지 않기",
+    "saveSkipHint": "선택한 공개 여부가 기본값이 됩니다",
+    "saveButton": "저장",
+    "okButton": "확인",
+    "deckSavedPublic": "덱이 공개로 저장되었습니다.",
+    "deckSavedPrivate": "덱이 비공개로 저장되었습니다.",
+    "previewFailedNote": "(미리보기 이미지 생성에 실패했습니다)",
+    "redirectingHome": "잠시 후 홈으로 이동합니다.",
+    "saveFailedTitle": "저장에 실패했습니다.",
+    "tryAgain": "다시 시도해 주세요.",
+    "noCardsToSave": "저장할 카드가 없습니다.",
+    "homeNav": "← 홈",
+
+    "authLogin": "로그인",
+    "authSignup": "회원가입",
+    "authMyProfile": "내 프로필",
+    "authMyDecks": "내 덱 관리",
+    "authPublicDecks": "공개 덱",
+    "authAdmin": "관리자",
+    "authLogout": "로그아웃",
+    "authAccountMenu": "계정 메뉴",
+    "authAccountMenuNamed": "{name} 계정 메뉴",
+
+    "loginPageTitle": "로그인",
+    "loginPageDesc": "덱을 저장하고 관리하려면<br />계정으로 로그인하세요.",
+    "signupPageTitle": "회원가입",
+    "signupPageDesc": "UADECK 계정을 만들고<br />덱을 저장·공유해 보세요.",
+    "emailLabel": "이메일",
+    "passwordLabel": "비밀번호",
+    "usernameLabel": "사용자명",
+    "passwordConfirmLabel": "비밀번호 확인",
+    "passwordConfirmPlaceholder": "비밀번호 재입력",
+    "signupPasswordPlaceholder": "8자 이상",
+    "passwordMismatch": "비밀번호가 일치하지 않습니다.",
+    "signupButton": "가입하기",
+    "loginButton": "로그인",
+    "noAccount": "계정이 없으신가요?",
+    "hasAccount": "이미 계정이 있으신가요?",
+
+    "deckHistoryTitle": "내 덱 관리",
+    "deckHistoryDesc": "저장한 덱 목록입니다. 공개 전환 시「공개 덱」목록에 표시됩니다.",
+    "publicDecksTitle": "공개 덱",
+    "publicDecksDesc": "사용자가 공개로 전환한 덱 목록입니다. 내 덱 관리에서「공개 전환」하면 여기에 표시됩니다.",
+
+    "profileTitle": "내 프로필",
+    "profileDesc": "프로필 사진, 사용자명, 이메일, 비밀번호를 변경할 수 있습니다.",
+    "profileSave": "프로필 저장",
+    "profileDeckSettings": "덱 저장 설정",
+    "profileDeckSettingsDesc": "「내 덱으로 저장」시 공개 여부 기본값과 확인 방식을 설정합니다.",
+    "profileDefaultPublic": "기본 공개",
+    "profileDefaultPublicHint": "저장 시 기본으로 공개 덱에 노출",
+    "profileAskOnSave": "저장 시 공개 여부 물어보기",
+    "profileAskOnSaveHint": "끄면 설정한 기본값으로 바로 저장",
+    "profileDeckPrefsSaved": "덱 저장 설정이 적용되었습니다.",
+    "profileSettingOn": "ON",
+    "profileSettingOff": "OFF",
+    "changePassword": "비밀번호 변경",
+    "changePasswordButton": "변경",
+    "newPasswordLabel": "새 비밀번호",
+    "confirmPasswordLabel": "새 비밀번호 확인",
+    "loadingLabel": "불러오는 중...",
+
+    "deckSearchPlaceholder": "덱 이름 또는 시리즈 검색...",
+    "deckAllSeries": "모든 시리즈",
+    "deckLoading": "불러오는 중...",
+    "deckEmpty": "저장된 덱이 없습니다.",
+    "deckNoMatch": "조건에 맞는 덱이 없습니다.",
+    "deckUntitled": "이름 없음",
+    "deckNoPreview": "미리보기 없음",
+    "deckResaveHint": "Preview에서 다시 저장",
+    "deckBadgePublic": "공개",
+    "deckBadgePrivate": "비공개",
+    "deckMakePublic": "공개 전환",
+    "deckMakePrivate": "비공개 전환",
+    "deckLoad": "불러오기",
+    "deckCopyLink": "링크 복사",
+    "deckDelete": "삭제",
+    "deckViews": "조회",
+    "deckCountFormat": "{filtered} / {total}개",
+    "publicDeckEmpty": "공개된 덱이 없습니다.",
+    "publicDeckSearchPlaceholder": "덱 이름·시리즈·작성자 검색...",
+    "deckLinkCopied": "공유 링크가 복사되었습니다.",
+    "deckMakePublicConfirm": "이 덱을 공개 덱 목록에 표시합니다. 계속할까요?",
+    "deckMakePrivateConfirm": "비공개로 전환합니다. 공개 목록에서 숨겨집니다.",
+    "deckDeleteConfirm": "이 덱을 삭제하시겠습니까?",
+    "deckFavorite": "즐겨찾기",
+    "deckFavoriteFilter": "즐겨찾기",
+    "deckFavoriteFilterOnly": "즐겨찾기만 보기",
+    "deckMoreActions": "더 보기",
+    "deckNoFavorites": "즐겨찾기한 덱이 없습니다.",
+    "deckHoldPreviewHint": "클릭·길게 눌러 크게 보기",
+    "pageHelpLabel": "페이지 안내",
+
     "all": "전체",
     "metaDeck": "공개 덱",
     "titlePrompt": "작품을 선택해주세요",
diff --git a/index.html b/index.html
index 30cee61..d93f073 100644
--- a/index.html
+++ b/index.html
@@ -98,7 +98,7 @@
         <script type="module">
             async function loadSeriesList() {
                 const urlParams = new URLSearchParams(window.location.search);
-                const lang = urlParams.get('lang') || 'ko';
+                const lang = urlParams.get('lang') || localStorage.getItem('lang') || 'ko';
 
                 try {
                     const response = await fetch(`./i18n/translations.${lang}.json`);
@@ -163,17 +163,24 @@
                 }
             }
 
-            window.changeLanguage = function (lang) {
+            window.changeLanguage = async function (lang) {
                 localStorage.setItem('lang', lang);
                 const currentUrl = new URL(window.location.href);
                 currentUrl.searchParams.set('lang', lang);
                 window.history.pushState({}, '', currentUrl.toString());
-                loadSeriesList();
+                await loadSeriesList();
+                if (window.UaPageI18n?.applyPageI18n) {
+                    await window.UaPageI18n.applyPageI18n();
+                }
+                if (window.UaDeckAuth?.refresh) {
+                    await window.UaDeckAuth.refresh();
+                }
             };
 
             window.addEventListener('popstate', () => loadSeriesList());
             loadSeriesList();
         </script>
+        <script src="/script/page-i18n.js"></script>
         <script src="/script/auth-header.js"></script>
     </body>
 </html>
diff --git a/login.html b/login.html
index c015c74..3fbc248 100644
--- a/login.html
+++ b/login.html
@@ -20,29 +20,30 @@
 
         <main class="auth-main">
             <header class="auth-header">
-                <h1>로그인</h1>
-                <p>덱을 저장하고 관리하려면<br />계정으로 로그인하세요.</p>
+                <h1 data-i18n="loginPageTitle">로그인</h1>
+                <p data-i18n-html="loginPageDesc">덱을 저장하고 관리하려면<br />계정으로 로그인하세요.</p>
             </header>
 
             <form id="login-form" class="auth-card">
                 <div class="auth-field">
-                    <label class="auth-label" for="email">이메일</label>
+                    <label class="auth-label" for="email" data-i18n="emailLabel">이메일</label>
                     <input type="email" id="email" required class="auth-input" placeholder="you@example.com" autocomplete="email" />
                 </div>
                 <div class="auth-field">
-                    <label class="auth-label" for="password">비밀번호</label>
+                    <label class="auth-label" for="password" data-i18n="passwordLabel">비밀번호</label>
                     <input type="password" id="password" required class="auth-input" placeholder="••••••••" autocomplete="current-password" />
                 </div>
                 <p id="error-msg" class="auth-error hidden"></p>
-                <button type="submit" class="auth-submit">로그인</button>
+                <button type="submit" class="auth-submit" data-i18n="loginButton">로그인</button>
             </form>
 
             <p class="auth-footer">
-                계정이 없으신가요?
-                <a href="/signup.html">회원가입</a>
+                <span data-i18n="noAccount">계정이 없으신가요?</span>
+                <a href="/signup.html" data-i18n="authSignup">회원가입</a>
             </p>
         </main>
 
+        <script src="/script/page-i18n.js"></script>
         <script src="/script/api.js"></script>
         <script>
             document.getElementById('login-form').addEventListener('submit', async (e) => {
diff --git a/nginx/default.conf b/nginx/default.conf
index c4303a0..4daba2a 100644
--- a/nginx/default.conf
+++ b/nginx/default.conf
@@ -5,12 +5,7 @@ server {
     root /usr/share/nginx/html;
     index index.html;
 
-    client_max_body_size 2m;
-
-    # 공유 링크: /d/x7Kp9m2Q → cardList?d=
-    location ~ ^/d/([A-Za-z0-9]+)$ {
-        return 302 /cardList.html?d=$1;
-    }
+    client_max_body_size 25m;
 
     # API → 백엔드 컨테이너
     location /api/ {
@@ -20,6 +15,7 @@ server {
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
+        client_max_body_size 25m;
     }
 
     # 정적 자산 캐시
diff --git a/nginx/uadeck.conf b/nginx/uadeck.conf
index 9e21859..6b7f77f 100644
--- a/nginx/uadeck.conf
+++ b/nginx/uadeck.conf
@@ -6,6 +6,9 @@ location ~ ^/d/([A-Za-z0-9]+)$ {
 }
 
 # API 프록시 (정적 사이트와 함께 사용)
+# 덱 저장 시 미리보기 PNG(base64) 포함 — 2m 이하면 413 발생
+client_max_body_size 25m;
+
 location /api/ {
     proxy_pass http://uadeck-api:3000;
     proxy_http_version 1.1;
@@ -13,4 +16,5 @@ location /api/ {
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
+    client_max_body_size 25m;
 }
diff --git a/preset.html b/preset.html
index f0e9dde..6d9e8d3 100644
--- a/preset.html
+++ b/preset.html
@@ -26,35 +26,80 @@
             <div class="app-body-layout">
                 <main class="app-main deck-history-main">
             <header class="deck-history-header">
-                <h1>공개 덱</h1>
-                <p>사용자가 공개로 전환한 덱 목록입니다. 내 덱 관리에서「공개 전환」하면 여기에 표시됩니다.</p>
+                <div class="page-title-row">
+                    <h1 data-i18n="publicDecksTitle">공개 덱</h1>
+                    <button type="button" class="page-help-btn" data-i18n-tooltip="publicDecksDesc" aria-expanded="false">?</button>
+                </div>
             </header>
 
             <div id="deck-toolbar" class="deck-history-toolbar hidden">
-                <input type="search" id="deck-search" class="deck-search-input" placeholder="덱 이름·시리즈·작성자 검색..." autocomplete="off" />
-                <select id="deck-series-filter" class="deck-series-select" aria-label="시리즈 필터">
-                    <option value="">모든 시리즈</option>
-                </select>
-                <span id="deck-count" class="deck-count-label"></span>
+                <div class="deck-toolbar-fav-row">
+                    <button type="button" id="deck-favorite-filter" class="deck-favorite-filter" aria-pressed="false">
+                        <span class="deck-favorite-filter-icon deck-star-icon" aria-hidden="true"></span>
+                        <span data-i18n="deckFavoriteFilterOnly">즐겨찾기만 보기</span>
+                        <span id="deck-fav-count" class="deck-fav-count"></span>
+                    </button>
+                </div>
+                <div class="deck-toolbar-main-row">
+                    <input type="search" id="deck-search" class="deck-search-input" data-i18n-placeholder="publicDeckSearchPlaceholder" placeholder="덱 이름·시리즈·작성자 검색..." autocomplete="off" />
+                    <select id="deck-series-filter" class="deck-series-select" aria-label="시리즈 필터">
+                        <option value="">모든 시리즈</option>
+                    </select>
+                    <span id="deck-count" class="deck-count-label"></span>
+                </div>
             </div>
 
             <div id="preset-list">
-                <div class="deck-status-message">불러오는 중...</div>
+                <div class="deck-status-message" data-i18n="deckLoading">불러오는 중...</div>
             </div>
                 </main>
 
                 <aside class="app-ad-rail" aria-label="광고">
-                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar"></div>
+                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar">
+                        <ins
+                            class="adsbygoogle"
+                            style="display: block"
+                            data-ad-client="ca-pub-4516420168710424"
+                            data-ad-slot="4260332296"
+                            data-ad-format="auto"
+                            data-full-width-responsive="true"
+                        ></ins>
+                    </div>
                 </aside>
             </div>
         </div>
 
         <script src="/script/api.js"></script>
+        <script src="/script/ads.js"></script>
+        <script src="/script/deck-favorites.js"></script>
+        <script src="/script/deck-preview-hold.js"></script>
+        <script src="/script/page-i18n.js"></script>
+        <script src="/script/page-help.js"></script>
         <script src="/script/auth-header.js"></script>
         <script>
             /** @type {Array<object>} */
             let allDecks = [];
 
+            /**
+             * @param {string} key
+             * @param {string} fallback
+             * @returns {string}
+             */
+            function t(key, fallback) {
+                return window.UaPageI18n?.t(key, fallback) || fallback;
+            }
+
+            /**
+             * @param {number} filtered
+             * @param {number} total
+             * @returns {string}
+             */
+            function formatDeckCount(filtered, total) {
+                return t('deckCountFormat', '{filtered} / {total}개')
+                    .replace('{filtered}', String(filtered))
+                    .replace('{total}', String(total));
+            }
+
             function escapeHtml(str) {
                 return String(str ?? '')
                     .replace(/&/g, '&amp;')
@@ -72,7 +117,7 @@
                 });
                 const sorted = [...seriesMap.entries()].sort((a, b) => String(a[1]).localeCompare(String(b[1]), 'ko'));
                 select.innerHTML =
-                    '<option value="">모든 시리즈</option>' +
+                    `<option value="">${escapeHtml(t('deckAllSeries', '모든 시리즈'))}</option>` +
                     sorted.map(([key, label]) => `<option value="${escapeHtml(key)}">${escapeHtml(label)}</option>`).join('');
                 if (current && seriesMap.has(current)) select.value = current;
             }
@@ -80,7 +125,10 @@
             function getFilteredDecks() {
                 const query = document.getElementById('deck-search').value.trim().toLowerCase();
                 const series = document.getElementById('deck-series-filter').value;
+                const favOnly =
+                    document.getElementById('deck-favorite-filter')?.getAttribute('aria-pressed') === 'true';
                 return allDecks.filter((d) => {
+                    if (favOnly && !UaDeckFavorites.isFavorite(d.share_code)) return false;
                     if (series && d.series !== series) return false;
                     if (!query) return true;
                     const haystack = [d.name, d.series_name, d.series, d.author, d.share_code].filter(Boolean).join(' ').toLowerCase();
@@ -88,42 +136,89 @@
                 });
             }
 
-            function renderPreviewHtml(d, title) {
-                if (!d.preview_url) {
-                    return '<div class="deck-card-preview-placeholder">미리보기 없음</div>';
-                }
+            /**
+             * @param {object} d
+             * @returns {string|null}
+             */
+            function getPreviewSrc(d) {
+                if (!d.preview_url) return null;
                 const src = UaDeckApi.resolveMediaUrl(d.preview_url);
                 const version = d.updated_at ? `?v=${encodeURIComponent(d.updated_at)}` : '';
-                return `<img src="${escapeHtml(src + version)}" alt="${title}" loading="lazy" class="deck-card-preview-img" />`;
+                return src + version;
+            }
+
+            /**
+             * @param {string} shareCode
+             * @returns {string}
+             */
+            function countFavorites() {
+                return allDecks.filter((d) => UaDeckFavorites.isFavorite(d.share_code)).length;
+            }
+
+            function updateFavCount() {
+                const el = document.getElementById('deck-fav-count');
+                if (!el) return;
+                const n = countFavorites();
+                el.textContent = n > 0 ? String(n) : '';
+            }
+
+            function favoriteButtonHtml(shareCode) {
+                const on = UaDeckFavorites.isFavorite(shareCode);
+                const cls = on ? 'deck-card-btn-favorite is-on' : 'deck-card-btn-favorite';
+                const starCls = on ? 'deck-star-icon is-on' : 'deck-star-icon';
+                return `<button type="button" class="deck-card-btn ${cls}" data-favorite="${escapeHtml(shareCode)}" aria-pressed="${on ? 'true' : 'false'}"><span class="${starCls}" aria-hidden="true"></span>${escapeHtml(t('deckFavorite', '즐겨찾기'))}</button>`;
+            }
+
+            function renderPreviewHtml(d, title) {
+                const previewSrc = getPreviewSrc(d);
+                if (!previewSrc) {
+                    return `<div class="deck-card-preview"><div class="deck-card-preview-placeholder">${escapeHtml(t('deckNoPreview', '미리보기 없음'))}</div></div>`;
+                }
+                const holdAttrs = `data-hold-preview data-preview-src="${escapeHtml(previewSrc)}"`;
+                return `<div class="deck-card-preview deck-card-preview--holdable" ${holdAttrs}><img src="${escapeHtml(previewSrc)}" alt="${title}" loading="lazy" class="deck-card-preview-img" draggable="false" /></div>`;
             }
 
             function renderDeckCard(d) {
                 const title = escapeHtml(d.name || d.series_name || d.series);
                 const seriesLabel = escapeHtml(d.series_name || d.series);
                 const date = new Date(d.updated_at).toLocaleDateString('ko-KR');
+                const favClass = UaDeckFavorites.isFavorite(d.share_code) ? 'deck-card is-favorite' : 'deck-card';
                 return `
-                    <a href="/cardList.html?series=${escapeHtml(d.series)}&seriesName=${encodeURIComponent(d.series_name || '')}&d=${escapeHtml(d.share_code)}" class="deck-card" style="text-decoration:none;color:inherit">
-                        <div class="deck-card-preview">${renderPreviewHtml(d, title)}</div>
+                    <article class="${favClass}" data-code="${escapeHtml(d.share_code)}">
+                        ${renderPreviewHtml(d, title)}
                         <div class="deck-card-body">
                             <span class="deck-card-series">${seriesLabel}</span>
                             <h2 class="deck-card-title">${title}</h2>
-                            <div class="deck-card-meta">${escapeHtml(d.author)} · 조회 ${d.view_count} · ${date}</div>
+                            <div class="deck-card-meta">${escapeHtml(d.author)} · ${escapeHtml(t('deckViews', '조회'))} ${d.view_count} · ${date}</div>
+                            <div class="deck-card-actions">
+                                ${favoriteButtonHtml(d.share_code)}
+                                <button type="button" class="deck-card-btn deck-card-btn-load" data-load="${escapeHtml(d.share_code)}" data-series="${escapeHtml(d.series)}" data-name="${escapeHtml(d.series_name || '')}">${escapeHtml(t('deckLoad', '불러오기'))}</button>
+                            </div>
                         </div>
-                    </a>`;
+                    </article>`;
             }
 
             function renderList() {
                 const list = document.getElementById('preset-list');
                 const countEl = document.getElementById('deck-count');
                 const filtered = getFilteredDecks();
-                countEl.textContent = `${filtered.length} / ${allDecks.length}개`;
+                countEl.textContent = formatDeckCount(filtered.length, allDecks.length);
+                updateFavCount();
 
                 if (!filtered.length) {
-                    list.innerHTML = '<div class="deck-grid"><div class="deck-grid-empty">공개된 덱이 없습니다.</div></div>';
+                    const favOnly =
+                        document.getElementById('deck-favorite-filter')?.getAttribute('aria-pressed') === 'true';
+                    const emptyMsg = favOnly
+                        ? t('deckNoFavorites', '즐겨찾기한 덱이 없습니다.')
+                        : allDecks.length
+                          ? t('deckNoMatch', '조건에 맞는 덱이 없습니다.')
+                          : t('publicDeckEmpty', '공개된 덱이 없습니다.');
+                    list.innerHTML = `<div class="deck-grid"><div class="deck-grid-empty">${escapeHtml(emptyMsg)}</div></div>`;
                     return;
                 }
 
                 list.innerHTML = `<div class="deck-grid">${filtered.map(renderDeckCard).join('')}</div>`;
+                UaDeckPreviewHold.bindHoldPreview(list);
             }
 
             async function loadPublicDecks() {
@@ -134,7 +229,7 @@
                     allDecks = presets;
                     if (!presets.length) {
                         toolbar.classList.add('hidden');
-                        list.innerHTML = '<div class="deck-status-message">공개된 덱이 없습니다.</div>';
+                        list.innerHTML = `<div class="deck-status-message">${escapeHtml(t('publicDeckEmpty', '공개된 덱이 없습니다.'))}</div>`;
                         return;
                     }
                     toolbar.classList.remove('hidden');
@@ -146,10 +241,39 @@
                 }
             }
 
-            document.addEventListener('DOMContentLoaded', () => {
+            document.addEventListener('DOMContentLoaded', async () => {
+                if (window.UaPageI18n?.applyPageI18n) {
+                    await window.UaPageI18n.applyPageI18n();
+                }
                 loadPublicDecks();
                 document.getElementById('deck-search').addEventListener('input', renderList);
                 document.getElementById('deck-series-filter').addEventListener('change', renderList);
+
+                const favFilterBtn = document.getElementById('deck-favorite-filter');
+                const favFilterIcon = favFilterBtn.querySelector('.deck-star-icon');
+                favFilterBtn.addEventListener('click', () => {
+                    const on = favFilterBtn.getAttribute('aria-pressed') !== 'true';
+                    favFilterBtn.setAttribute('aria-pressed', on ? 'true' : 'false');
+                    favFilterIcon.classList.toggle('is-on', on);
+                    renderList();
+                });
+
+                document.getElementById('preset-list').addEventListener('click', (e) => {
+                    const favBtn = e.target.closest('[data-favorite]');
+                    if (favBtn) {
+                        UaDeckFavorites.toggle(favBtn.dataset.favorite);
+                        renderList();
+                        return;
+                    }
+
+                    const loadBtn = e.target.closest('[data-load]');
+                    if (loadBtn) {
+                        const code = loadBtn.dataset.load;
+                        const series = loadBtn.dataset.series;
+                        const name = loadBtn.dataset.name;
+                        location.href = `/cardList.html?series=${series}&seriesName=${encodeURIComponent(name)}&d=${code}`;
+                    }
+                });
             });
         </script>
     </body>
diff --git a/profile.html b/profile.html
index 4f37995..c88cb76 100644
--- a/profile.html
+++ b/profile.html
@@ -26,13 +26,15 @@
             <div class="app-body-layout">
                 <main class="app-main profile-content">
             <header class="profile-header">
-                <h1>내 프로필</h1>
-                <p>프로필 사진, 사용자명, 이메일, 비밀번호를 변경할 수 있습니다.</p>
+                <div class="page-title-row">
+                    <h1 data-i18n="profileTitle">내 프로필</h1>
+                    <button type="button" class="page-help-btn" data-i18n-tooltip="profileDesc" aria-expanded="false">?</button>
+                </div>
             </header>
 
             <div id="profile-loading" class="profile-card">
                 <div class="profile-body">
-                    <p style="margin: 0; color: #64748b; font-size: 0.875rem">불러오는 중...</p>
+                    <p data-i18n="loadingLabel" style="margin: 0; color: #64748b; font-size: 0.875rem">불러오는 중...</p>
                 </div>
             </div>
 
@@ -54,15 +56,15 @@
 
                 <div class="profile-body">
                     <div class="profile-field">
-                        <label class="profile-label" for="profile-email">이메일</label>
+                        <label class="profile-label" for="profile-email" data-i18n="emailLabel">이메일</label>
                         <input type="email" id="profile-email" class="profile-input" autocomplete="email" />
                     </div>
                     <div class="profile-field">
-                        <label class="profile-label" for="profile-username">사용자명</label>
+                        <label class="profile-label" for="profile-username" data-i18n="usernameLabel">사용자명</label>
                         <input type="text" id="profile-username" class="profile-input" autocomplete="username" />
                     </div>
 
-                    <button type="button" id="profile-save" class="profile-btn profile-btn-primary" disabled>
+                    <button type="button" id="profile-save" class="profile-btn profile-btn-primary" disabled data-i18n="profileSave">
                         프로필 저장
                     </button>
                     <p id="profile-error" class="profile-error hidden"></p>
@@ -70,34 +72,45 @@
 
                     <div class="profile-divider"></div>
 
-                    <h3 class="profile-section-title">덱 저장 설정</h3>
-                    <p class="profile-section-desc">「내 덱으로 저장」시 공개 여부 기본값과 확인 방식을 설정합니다.</p>
-
-                    <div class="profile-toggle-row">
-                        <div>
-                            <div class="profile-toggle-label">기본 공개</div>
-                            <div class="profile-toggle-hint">저장 시 기본으로 공개 덱에 노출</div>
-                        </div>
-                        <button type="button" id="pref-public-toggle" class="profile-toggle" aria-pressed="true">
-                            <span id="pref-public-circle" class="profile-toggle-circle is-on"></span>
-                        </button>
-                        <input type="checkbox" id="pref-public-check" class="hidden" checked />
+                    <div class="profile-section-head">
+                        <h3 class="profile-section-title" data-i18n="profileDeckSettings">덱 저장 설정</h3>
+                        <button type="button" class="page-help-btn" data-i18n-tooltip="profileDeckSettingsDesc" aria-expanded="false">?</button>
                     </div>
 
-                    <div class="profile-toggle-row">
-                        <div>
-                            <div class="profile-toggle-label">저장 시 공개 여부 물어보기</div>
-                            <div class="profile-toggle-hint">끄면 설정한 기본값으로 바로 저장</div>
+                    <div class="profile-settings-panel">
+                        <div class="profile-toggle-row">
+                            <label class="profile-toggle-text" for="pref-public-toggle">
+                                <span class="profile-toggle-label" data-i18n="profileDefaultPublic">기본 공개</span>
+                                <span class="profile-toggle-hint" data-i18n="profileDefaultPublicHint">저장 시 기본으로 공개 덱에 노출</span>
+                            </label>
+                            <div class="profile-toggle-wrap">
+                                <span id="pref-public-state" class="profile-toggle-state is-on" data-i18n-on="profileSettingOn" data-i18n-off="profileSettingOff">ON</span>
+                                <button type="button" id="pref-public-toggle" class="profile-toggle is-on" aria-pressed="true">
+                                    <span id="pref-public-circle" class="profile-toggle-circle is-on"></span>
+                                </button>
+                                <input type="checkbox" id="pref-public-check" class="hidden" checked />
+                            </div>
+                        </div>
+
+                        <div class="profile-toggle-row">
+                            <label class="profile-toggle-text" for="pref-ask-toggle">
+                                <span class="profile-toggle-label" data-i18n="profileAskOnSave">저장 시 공개 여부 물어보기</span>
+                                <span class="profile-toggle-hint" data-i18n="profileAskOnSaveHint">끄면 설정한 기본값으로 바로 저장</span>
+                            </label>
+                            <div class="profile-toggle-wrap">
+                                <span id="pref-ask-state" class="profile-toggle-state is-on" data-i18n-on="profileSettingOn" data-i18n-off="profileSettingOff">ON</span>
+                                <button type="button" id="pref-ask-toggle" class="profile-toggle is-on" aria-pressed="true">
+                                    <span id="pref-ask-circle" class="profile-toggle-circle is-on"></span>
+                                </button>
+                                <input type="checkbox" id="pref-ask-check" class="hidden" checked />
+                            </div>
                         </div>
-                        <button type="button" id="pref-ask-toggle" class="profile-toggle" aria-pressed="true">
-                            <span id="pref-ask-circle" class="profile-toggle-circle is-on"></span>
-                        </button>
-                        <input type="checkbox" id="pref-ask-check" class="hidden" checked />
                     </div>
+                    <p id="profile-prefs-notice" class="profile-prefs-notice" aria-live="polite"></p>
 
                     <div class="profile-divider"></div>
 
-                    <button type="button" id="profile-open-password" class="profile-btn profile-btn-outline">
+                    <button type="button" id="profile-open-password" class="profile-btn profile-btn-outline" data-i18n="changePassword">
                         비밀번호 변경
                     </button>
                 </div>
@@ -105,35 +118,47 @@
                 </main>
 
                 <aside class="app-ad-rail" aria-label="광고">
-                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar"></div>
+                    <div class="app-ad-slot app-ad-slot--skyscraper" id="ad-sidebar">
+                        <ins
+                            class="adsbygoogle"
+                            style="display: block"
+                            data-ad-client="ca-pub-4516420168710424"
+                            data-ad-slot="4260332296"
+                            data-ad-format="auto"
+                            data-full-width-responsive="true"
+                        ></ins>
+                    </div>
                 </aside>
             </div>
         </div>
 
         <div id="password-modal" class="profile-modal">
             <div class="profile-modal-box">
-                <h3>비밀번호 변경</h3>
+                <h3 data-i18n="changePassword">비밀번호 변경</h3>
                 <div class="profile-field">
-                    <label class="profile-label" for="password-current">현재 비밀번호</label>
+                    <label class="profile-label" for="password-current" data-i18n="passwordLabel">현재 비밀번호</label>
                     <input type="password" id="password-current" class="profile-input" autocomplete="current-password" />
                 </div>
                 <div class="profile-field">
-                    <label class="profile-label" for="password-new">새 비밀번호</label>
+                    <label class="profile-label" for="password-new" data-i18n="newPasswordLabel">새 비밀번호</label>
                     <input type="password" id="password-new" class="profile-input" autocomplete="new-password" />
                 </div>
                 <div class="profile-field">
-                    <label class="profile-label" for="password-confirm">새 비밀번호 확인</label>
+                    <label class="profile-label" for="password-confirm" data-i18n="confirmPasswordLabel">새 비밀번호 확인</label>
                     <input type="password" id="password-confirm" class="profile-input" autocomplete="new-password" />
                 </div>
                 <p id="password-error" class="profile-error hidden"></p>
                 <div class="profile-modal-actions">
-                    <button type="button" id="password-cancel" class="profile-btn profile-btn-outline">취소</button>
-                    <button type="button" id="password-save" class="profile-btn profile-btn-primary">변경</button>
+                    <button type="button" id="password-cancel" class="profile-btn profile-btn-outline" data-i18n="cancel">취소</button>
+                    <button type="button" id="password-save" class="profile-btn profile-btn-primary" data-i18n="changePasswordButton">변경</button>
                 </div>
             </div>
         </div>
 
         <script src="/script/api.js"></script>
+        <script src="/script/ads.js"></script>
+        <script src="/script/page-i18n.js"></script>
+        <script src="/script/page-help.js"></script>
         <script src="/script/deck-prefs.js"></script>
         <script src="/script/image-utils.js"></script>
         <script src="/script/auth-header.js"></script>
@@ -149,23 +174,46 @@
             let pendingRemoveAvatar = false;
             /** @type {{ email: string, username: string, hasAvatar: boolean }} */
             let baseline = { email: '', username: '', hasAvatar: false };
+            /** @type {number|null} */
+            let prefsNoticeTimer = null;
+
+            /**
+             * @param {string} key
+             * @param {string} fallback
+             * @returns {string}
+             */
+            function t(key, fallback) {
+                return window.UaPageI18n?.t(key, fallback) || fallback;
+            }
 
             /**
              * 프로필 토글 UI
              * @param {string} toggleId
              * @param {string} circleId
              * @param {string} checkboxId
+             * @param {string|null} stateId
              * @param {boolean} on
              */
-            function setProfileToggle(toggleId, circleId, checkboxId, on) {
+            function setProfileToggle(toggleId, circleId, checkboxId, stateId, on) {
                 const toggle = document.getElementById(toggleId);
                 const circle = document.getElementById(circleId);
                 const checkbox = document.getElementById(checkboxId);
+                const stateEl = stateId ? document.getElementById(stateId) : null;
                 if (!toggle || !circle || !checkbox) return;
                 checkbox.checked = on;
                 toggle.setAttribute('aria-pressed', on ? 'true' : 'false');
                 toggle.classList.toggle('is-on', on);
                 circle.classList.toggle('is-on', on);
+                if (stateEl) {
+                    const onLabel = stateEl.dataset.i18nOn
+                        ? t(stateEl.dataset.i18nOn, 'ON')
+                        : 'ON';
+                    const offLabel = stateEl.dataset.i18nOff
+                        ? t(stateEl.dataset.i18nOff, 'OFF')
+                        : 'OFF';
+                    stateEl.textContent = on ? onLabel : offLabel;
+                    stateEl.classList.toggle('is-on', on);
+                }
             }
 
             /**
@@ -174,15 +222,35 @@
              */
             function fillDeckPrefs(user) {
                 const prefs = UaDeckPrefs.getPrefs(user);
-                setProfileToggle('pref-public-toggle', 'pref-public-circle', 'pref-public-check', prefs.defaultPublic);
+                setProfileToggle(
+                    'pref-public-toggle',
+                    'pref-public-circle',
+                    'pref-public-check',
+                    'pref-public-state',
+                    prefs.defaultPublic,
+                );
                 setProfileToggle(
                     'pref-ask-toggle',
                     'pref-ask-circle',
                     'pref-ask-check',
+                    'pref-ask-state',
                     !prefs.skipPrompt,
                 );
             }
 
+            /**
+             * 덱 저장 설정 적용 안내
+             */
+            function showPrefsSavedNotice() {
+                const el = document.getElementById('profile-prefs-notice');
+                if (!el) return;
+                el.textContent = t('profileDeckPrefsSaved', '덱 저장 설정이 적용되었습니다.');
+                if (prefsNoticeTimer) clearTimeout(prefsNoticeTimer);
+                prefsNoticeTimer = window.setTimeout(() => {
+                    el.textContent = '';
+                }, 2500);
+            }
+
             /**
              * 덱 저장 설정 저장
              */
@@ -198,6 +266,7 @@
                     cached.skipDeckPublicPrompt = prefs.skipPrompt;
                     UaDeckApi.saveAuth(UaDeckApi.getToken(), cached);
                 }
+                showPrefsSavedNotice();
             }
 
             /**
@@ -275,6 +344,10 @@
             }
 
             async function init() {
+                if (window.UaPageI18n?.applyPageI18n) {
+                    await window.UaPageI18n.applyPageI18n();
+                }
+
                 if (!UaDeckApi.getToken()) {
                     location.href = '/login.html?redirect=' + encodeURIComponent('/profile.html');
                     return;
@@ -306,6 +379,7 @@
                     'pref-public-toggle',
                     'pref-public-circle',
                     'pref-public-check',
+                    'pref-public-state',
                     !checkbox.checked,
                 );
                 await persistDeckPrefs();
@@ -313,10 +387,25 @@
 
             document.getElementById('pref-ask-toggle').addEventListener('click', async () => {
                 const checkbox = document.getElementById('pref-ask-check');
-                setProfileToggle('pref-ask-toggle', 'pref-ask-circle', 'pref-ask-check', !checkbox.checked);
+                setProfileToggle(
+                    'pref-ask-toggle',
+                    'pref-ask-circle',
+                    'pref-ask-check',
+                    'pref-ask-state',
+                    !checkbox.checked,
+                );
                 await persistDeckPrefs();
             });
 
+            document.querySelectorAll('.profile-toggle-text').forEach((label) => {
+                label.addEventListener('click', (e) => {
+                    const forId = label.getAttribute('for');
+                    if (!forId) return;
+                    const btn = document.getElementById(forId);
+                    if (btn && e.target !== btn) btn.click();
+                });
+            });
+
             document.getElementById('profile-avatar-btn').addEventListener('click', () => {
                 document.getElementById('profile-avatar-file').click();
             });
diff --git a/result.html b/result.html
index 2d7f533..126bbcf 100644
--- a/result.html
+++ b/result.html
@@ -158,7 +158,6 @@
             }
 
             .result-btn {
-                flex: 1;
                 padding: 1rem 0.5rem;
                 border: none;
                 border-radius: 1rem;
@@ -168,6 +167,17 @@
                 cursor: pointer;
                 transition: background 0.2s, transform 0.1s;
                 white-space: nowrap;
+                flex: 1 1 0;
+                min-width: 0;
+            }
+
+            .result-btn-home,
+            .result-btn-download {
+                flex: 0.5 1 0;
+            }
+
+            .result-btn-save.result-btn-save-footer {
+                flex: 2 1 0;
             }
 
             .result-btn:active {
@@ -252,6 +262,40 @@
                 margin-top: 0.125rem;
             }
 
+            .save-deck-switch {
+                position: relative;
+                flex-shrink: 0;
+                display: inline-flex;
+                width: 2.75rem;
+                height: 1.5rem;
+                align-items: center;
+                border: none;
+                border-radius: 9999px;
+                background: #e2e8f0;
+                cursor: pointer;
+                transition: background 0.2s;
+                padding: 0;
+            }
+
+            .save-deck-switch.is-on {
+                background: #2563eb;
+            }
+
+            .save-deck-switch-knob {
+                display: block;
+                width: 1rem;
+                height: 1rem;
+                border-radius: 9999px;
+                background: #fff;
+                transform: translateX(0.25rem);
+                transition: transform 0.2s;
+                box-shadow: 0 1px 3px rgba(15, 23, 42, 0.15);
+            }
+
+            .save-deck-switch.is-on .save-deck-switch-knob {
+                transform: translateX(1.5rem);
+            }
+
             .save-deck-modal-actions {
                 display: flex;
                 gap: 0.5rem;
@@ -323,6 +367,38 @@
                 color: #94a3b8;
                 text-align: center;
                 min-height: 1.125rem;
+                white-space: pre-line;
+                line-height: 1.5;
+            }
+
+            .save-loading-message.is-success {
+                color: #059669;
+            }
+
+            .save-loading-message.is-error {
+                color: #dc2626;
+            }
+
+            .save-loading-progress-wrap.hidden {
+                display: none;
+            }
+
+            .save-loading-confirm {
+                display: block;
+                width: 100%;
+                margin-top: 1.25rem;
+                padding: 0.875rem 1rem;
+                border: none;
+                border-radius: 0.75rem;
+                font-size: 0.875rem;
+                font-weight: 700;
+                color: #fff;
+                background: #2563eb;
+                cursor: pointer;
+            }
+
+            .save-loading-confirm.hidden {
+                display: none;
             }
 
             @media (max-width: 640px) {
@@ -338,10 +414,13 @@
             <div id="loading-screen" class="save-loading-overlay">
                 <div class="save-loading-box">
                     <p id="loading-message" class="save-loading-message"></p>
-                    <div class="save-loading-bar-track">
-                        <div id="loading-bar-fill" class="save-loading-bar-fill"></div>
+                    <div id="loading-progress-wrap" class="save-loading-progress-wrap">
+                        <div class="save-loading-bar-track">
+                            <div id="loading-bar-fill" class="save-loading-bar-fill"></div>
+                        </div>
                     </div>
                     <p id="loading-submessage" class="save-loading-submessage"></p>
+                    <button type="button" id="loading-confirm-btn" class="save-loading-confirm hidden">확인</button>
                 </div>
             </div>
 
@@ -404,32 +483,32 @@
                 <div class="result-footer-inner">
                     <button type="button" id="btn-go-home" onclick="goHome()" class="result-btn result-btn-home">홈으로</button>
                     <button type="button" id="i18n-btnDownload" onclick="saveAsImage()" class="result-btn result-btn-download">이미지로 다운로드</button>
-                    <button type="button" id="btn-save-deck" onclick="saveToMyDeck()" class="result-btn result-btn-save">내 덱으로 저장</button>
+                    <button type="button" id="btn-save-deck" onclick="saveToMyDeck()" class="result-btn result-btn-save result-btn-save-footer">내 덱으로 저장</button>
                 </div>
             </div>
         </div>
 
         <div id="save-deck-modal" class="save-deck-modal">
             <div class="save-deck-modal-box">
-                <h3>모두에게 공개할까요?</h3>
-                <p class="save-deck-modal-desc">공개하면「공개 덱」목록에 표시됩니다.</p>
+                <h3 id="save-modal-title">모두에게 공개할까요?</h3>
+                <p id="save-modal-desc" class="save-deck-modal-desc">공개하면「공개 덱」목록에 표시됩니다.</p>
                 <div class="save-deck-toggle-row">
                     <div>
-                        <div class="save-deck-toggle-label">공개</div>
-                        <div class="save-deck-toggle-hint">기본값: 예</div>
+                        <div id="save-public-label" class="save-deck-toggle-label">공개</div>
+                        <div id="save-public-hint" class="save-deck-toggle-hint">기본값: 예</div>
                     </div>
-                    <button type="button" id="save-public-toggle" class="relative inline-flex h-6 w-11 items-center rounded-full bg-blue-600 transition-colors">
-                        <span id="save-public-circle" class="inline-block h-4 w-4 transform rounded-full bg-white transition-transform translate-x-6"></span>
+                    <button type="button" id="save-public-toggle" class="save-deck-switch is-on" aria-pressed="true">
+                        <span id="save-public-circle" class="save-deck-switch-knob"></span>
                     </button>
                     <input type="checkbox" id="save-public-check" class="hidden" checked />
                 </div>
                 <div class="save-deck-toggle-row">
                     <div>
-                        <div class="save-deck-toggle-label">다음부터 물어보지 않기</div>
-                        <div class="save-deck-toggle-hint">선택한 공개 여부가 기본값이 됩니다</div>
+                        <div id="save-skip-label" class="save-deck-toggle-label">다음부터 물어보지 않기</div>
+                        <div id="save-skip-hint" class="save-deck-toggle-hint">선택한 공개 여부가 기본값이 됩니다</div>
                     </div>
-                    <button type="button" id="save-skip-toggle" class="relative inline-flex h-6 w-11 items-center rounded-full bg-slate-200 transition-colors">
-                        <span id="save-skip-circle" class="inline-block h-4 w-4 transform rounded-full bg-white transition-transform translate-x-1"></span>
+                    <button type="button" id="save-skip-toggle" class="save-deck-switch" aria-pressed="false">
+                        <span id="save-skip-circle" class="save-deck-switch-knob"></span>
                     </button>
                     <input type="checkbox" id="save-skip-check" class="hidden" />
                 </div>
@@ -505,9 +584,18 @@
                 setEl('i18n-hqDesc', 'hqDesc');
                 setEl('i18n-notice1', 'exportNotice1');
                 setEl('i18n-notice2', 'exportNotice2');
-                setEl('i18n-btnDownload', 'downloadImage');
-                setEl('btn-save-deck', 'saveToMyDeck', false);
+                setEl('i18n-btnDownload', 'downloadImageLabel');
+                setEl('btn-save-deck', 'saveToMyDeckLabel', false);
                 setEl('btn-go-home', 'goHome', false);
+                setEl('save-modal-title', 'savePublicTitle');
+                setEl('save-modal-desc', 'savePublicDesc');
+                setEl('save-public-label', 'savePublicLabel');
+                setEl('save-public-hint', 'savePublicDefault');
+                setEl('save-skip-label', 'saveSkipLabel');
+                setEl('save-skip-hint', 'saveSkipHint');
+                setEl('save-deck-cancel', 'cancel');
+                setEl('save-deck-confirm', 'saveButton');
+                setEl('loading-confirm-btn', 'okButton');
 
                 const deckInput = document.getElementById('deckName');
                 if (deckInput) deckInput.placeholder = translations.deckNamePlaceholder || "";
@@ -667,11 +755,14 @@
 
             /**
              * 미리보기 영역 PNG 캡처
+             * @param {{ highQuality?: boolean }} [options]
              * @returns {Promise<string>}
              */
-            async function capturePreviewPng() {
+            async function capturePreviewPng(options = {}) {
                                                 const area = document.getElementById('resultArea');
-                                                const hq = document.getElementById('highQuality').checked;
+                                                const hq =
+                                                    options.highQuality ??
+                                                    document.getElementById('highQuality').checked;
                                                 const originalStyle = area.getAttribute('style') || '';
                                                 const gridElements = area.querySelectorAll('div[class*="grid"]');
                                                 const originalGrids = Array.from(gridElements).map((el) => el.className);
@@ -731,6 +822,47 @@
                                                 }
                                             }
 
+                                            /** 저장·다운로드 캡처와 동일한 미리보기 기준 너비(px) */
+                                            const DECK_PREVIEW_SAVE_WIDTH = 1200;
+
+                                            /**
+                                             * 저장용 미리보기를 기준 너비로 정규화
+                                             * @param {string} dataUrl
+                                             * @param {number} [targetWidth]
+                                             * @returns {Promise<string>}
+                                             */
+                                            async function normalizePreviewForSave(
+                                                dataUrl,
+                                                targetWidth = DECK_PREVIEW_SAVE_WIDTH,
+                                            ) {
+                                                return new Promise((resolve, reject) => {
+                                                    const img = new Image();
+                                                    img.onload = () => {
+                                                        if (!img.width) {
+                                                            resolve(dataUrl);
+                                                            return;
+                                                        }
+                                                        const scale = targetWidth / img.width;
+                                                        const w = targetWidth;
+                                                        const h = Math.max(1, Math.round(img.height * scale));
+                                                        const canvas = document.createElement('canvas');
+                                                        canvas.width = w;
+                                                        canvas.height = h;
+                                                        const ctx = canvas.getContext('2d');
+                                                        if (!ctx) {
+                                                            resolve(dataUrl);
+                                                            return;
+                                                        }
+                                                        ctx.fillStyle = '#ffffff';
+                                                        ctx.fillRect(0, 0, w, h);
+                                                        ctx.drawImage(img, 0, 0, w, h);
+                                                        resolve(canvas.toDataURL('image/png'));
+                                                    };
+                                                    img.onerror = () => reject(new Error('Preview resize failed'));
+                                                    img.src = dataUrl;
+                                                });
+                                            }
+
                                             /**
                                              * 저장·공유 로딩 UI
                                              * @param {string} message
@@ -741,9 +873,21 @@
                                                 const msgEl = document.getElementById('loading-message');
                                                 const subEl = document.getElementById('loading-submessage');
                                                 const fillEl = document.getElementById('loading-bar-fill');
+                                                const progressWrap = document.getElementById('loading-progress-wrap');
+                                                const confirmBtn = document.getElementById('loading-confirm-btn');
                                                 let autoTimer = null;
                                                 let current = 0;
 
+                                                const resetUi = () => {
+                                                    msgEl.classList.remove('is-success', 'is-error');
+                                                    progressWrap.classList.remove('hidden');
+                                                    confirmBtn.classList.add('hidden');
+                                                    confirmBtn.onclick = null;
+                                                    fillEl.style.width = '0%';
+                                                    subEl.textContent = '';
+                                                    current = 0;
+                                                };
+
                                                 const stopAuto = () => {
                                                     if (autoTimer) {
                                                         clearInterval(autoTimer);
@@ -766,12 +910,64 @@
                                                     }, 120);
                                                 };
 
+                                                resetUi();
                                                 msgEl.textContent = message;
-                                                subEl.textContent = '';
-                                                fillEl.style.width = '0%';
-                                                current = 0;
                                                 screen.style.display = 'flex';
 
+                                                /**
+                                                 * 로딩 완료 → 결과 메시지 표시
+                                                 * @param {object} opts
+                                                 * @param {string} opts.title
+                                                 * @param {string} [opts.subtitle]
+                                                 * @param {boolean} [opts.redirectHome]
+                                                 * @param {number} [opts.redirectDelay]
+                                                 */
+                                                const finishSuccess = async ({
+                                                    title,
+                                                    subtitle = '',
+                                                    redirectHome = false,
+                                                    redirectDelay = 1400,
+                                                }) => {
+                                                    stopAuto();
+                                                    setProgress(100);
+                                                    await new Promise((r) => setTimeout(r, 380));
+                                                    progressWrap.classList.add('hidden');
+                                                    msgEl.textContent = title;
+                                                    msgEl.classList.add('is-success');
+                                                    subEl.textContent = redirectHome
+                                                        ? [subtitle, t('redirectingHome', '잠시 후 홈으로 이동합니다.')].filter(Boolean).join('\n')
+                                                        : subtitle;
+                                                    if (redirectHome) {
+                                                        await new Promise((r) => setTimeout(r, redirectDelay));
+                                                        screen.style.display = 'none';
+                                                        resetUi();
+                                                        goHome();
+                                                        return;
+                                                    }
+                                                    await new Promise((r) => setTimeout(r, 700));
+                                                    screen.style.display = 'none';
+                                                    resetUi();
+                                                };
+
+                                                /**
+                                                 * 오류 메시지 표시
+                                                 * @param {string} title
+                                                 * @param {string} [subtitle]
+                                                 */
+                                                const finishError = (title, subtitle = '') => {
+                                                    stopAuto();
+                                                    progressWrap.classList.add('hidden');
+                                                    fillEl.style.width = '100%';
+                                                    msgEl.textContent = title;
+                                                    msgEl.classList.add('is-error');
+                                                    subEl.textContent = subtitle;
+                                                    confirmBtn.classList.remove('hidden');
+                                                    confirmBtn.onclick = () => {
+                                                        screen.style.display = 'none';
+                                                        resetUi();
+                                                    };
+                                                };
+
                                                 return {
                                                     setProgress,
                                                     setSubmessage: (text) => {
@@ -779,15 +975,15 @@
                                                     },
                                                     startAuto,
                                                     stopAuto,
+                                                    finishSuccess,
+                                                    finishError,
                                                     complete: async (doneMessage) => {
-                                                        stopAuto();
-                                                        setProgress(100, doneMessage);
-                                                        await new Promise((r) => setTimeout(r, 450));
-                                                        screen.style.display = 'none';
+                                                        await finishSuccess({ title: doneMessage });
                                                     },
                                                     hide: () => {
                                                         stopAuto();
                                                         screen.style.display = 'none';
+                                                        resetUi();
                                                     },
                                                 };
                                             }
@@ -811,14 +1007,11 @@
                                              */
                                             function setToggleState(toggleId, circleId, checkboxId, on) {
                                                 const toggle = document.getElementById(toggleId);
-                                                const circle = document.getElementById(circleId);
                                                 const checkbox = document.getElementById(checkboxId);
-                                                if (!toggle || !circle || !checkbox) return;
+                                                if (!toggle || !checkbox) return;
                                                 checkbox.checked = on;
-                                                toggle.classList.toggle('bg-blue-600', on);
-                                                toggle.classList.toggle('bg-slate-200', !on);
-                                                circle.classList.toggle('translate-x-6', on);
-                                                circle.classList.toggle('translate-x-1', !on);
+                                                toggle.classList.toggle('is-on', on);
+                                                toggle.setAttribute('aria-pressed', on ? 'true' : 'false');
                                             }
 
                                             /**
@@ -906,20 +1099,26 @@
                                              */
                                             async function executeDeckSave(isPublic) {
                                                 const cards = getCardsPayload();
-                                                if (!cards.length) {
-                                                    alert('저장할 카드가 없습니다.');
-                                                    return;
-                                                }
-
                                                 const loader = beginSaveLoading(
                                                     t('savingToMyDeck', '내 덱으로 저장 중...'),
                                                 );
+                                                if (!cards.length) {
+                                                    loader.finishError(
+                                                        t('noCardsToSave', '저장할 카드가 없습니다.'),
+                                                        '',
+                                                    );
+                                                    return;
+                                                }
+
                                                 try {
                                                     loader.setProgress(8, t('savingPreview', '미리보기 생성 중...'));
                                                     loader.startAuto(52);
                                                     let previewImage = null;
                                                     try {
-                                                        previewImage = await capturePreviewPng();
+                                                        previewImage = await capturePreviewPng({ highQuality: false });
+                                                        if (previewImage) {
+                                                            previewImage = await normalizePreviewForSave(previewImage);
+                                                        }
                                                     } catch (captureErr) {
                                                         console.warn('Preview capture failed:', captureErr);
                                                     }
@@ -935,20 +1134,22 @@
                                                         isPublic,
                                                     });
                                                     loader.stopAuto();
-                                                    const visibility = isPublic ? '공개' : '비공개';
-                                                    if (!previewImage) {
-                                                        await loader.complete(t('saveComplete', '저장 완료'));
-                                                        alert(
-                                                            `덱이 ${visibility}로 저장되었습니다.\n(미리보기 이미지 생성 실패)\n${deck.name}`,
-                                                        );
-                                                    } else {
-                                                        await loader.complete(t('saveComplete', '저장 완료'));
-                                                        alert(`덱이 ${visibility}로 저장되었습니다.\n${deck.name}`);
-                                                    }
+                                                    const subtitle = !previewImage
+                                                        ? `${deck.name}\n${t('previewFailedNote', '(미리보기 이미지 생성에 실패했습니다)')}`
+                                                        : deck.name;
+                                                    await loader.finishSuccess({
+                                                        title: isPublic
+                                                            ? t('deckSavedPublic', '덱이 공개로 저장되었습니다.')
+                                                            : t('deckSavedPrivate', '덱이 비공개로 저장되었습니다.'),
+                                                        subtitle,
+                                                        redirectHome: true,
+                                                    });
                                                 } catch (e) {
                                                     console.error(e);
-                                                    loader.hide();
-                                                    alert(e.message || '저장에 실패했습니다.');
+                                                    loader.finishError(
+                                                        t('saveFailedTitle', '저장에 실패했습니다.'),
+                                                        e.message || t('tryAgain', '다시 시도해 주세요.'),
+                                                    );
                                                 }
                                             }
 
@@ -982,11 +1183,16 @@
                                                     link.download = `${fileNameStr}.png`;
                                                     link.href = dataUrl;
                                                     link.click();
-                                                    await loader.complete(t('downloadComplete', '다운로드 완료'));
+                                                    await loader.finishSuccess({
+                                                        title: t('downloadComplete', '다운로드 완료'),
+                                                        subtitle: `${fileNameStr}.png`,
+                                                    });
                                                 } catch (e) {
                                                     console.error('Capture Error:', e);
-                                                    loader.hide();
-                                                    alert(translations.saveError || '이미지 저장 실패');
+                                                    loader.finishError(
+                                                        t('saveError', '이미지 저장 실패'),
+                                                        t('tryAgain', '다시 시도해 주세요.'),
+                                                    );
                                                 }
                                             }
 
@@ -1011,6 +1217,7 @@
                                                 window.location.href = lang && lang !== 'ko' ? `/?lang=${lang}` : '/';
                                             }
         </script>
+        <script src="/script/page-i18n.js"></script>
         <script src="/script/auth-header.js"></script>
     </body>
 </html>
diff --git a/script/ads.js b/script/ads.js
new file mode 100644
index 0000000..6c9eb40
--- /dev/null
+++ b/script/ads.js
@@ -0,0 +1,20 @@
+/**
+ * Google AdSense 슬롯 초기화
+ */
+(function initAds() {
+    function pushAds() {
+        document.querySelectorAll('ins.adsbygoogle').forEach(() => {
+            try {
+                (window.adsbygoogle = window.adsbygoogle || []).push({});
+            } catch (err) {
+                console.warn('AdSense push failed:', err);
+            }
+        });
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', pushAds);
+    } else {
+        pushAds();
+    }
+})();
diff --git a/script/api.js b/script/api.js
index 6241ce9..1d8c18f 100644
--- a/script/api.js
+++ b/script/api.js
@@ -50,6 +50,9 @@ const UaDeckApi = (() => {
         if (res.status === 405 || res.status === 404) {
             return 'API 서버에 연결되지 않았습니다. Docker 또는 npm run api:dev 로 API를 실행하세요.';
         }
+        if (res.status === 413) {
+            return data.error || '업로드 크기가 제한을 초과했습니다. 고화질 옵션을 끄고 다시 시도해 주세요.';
+        }
         if (res.status === 0 || res.type === 'opaque') {
             return '네트워크 오류입니다. API 서버가 실행 중인지 확인하세요.';
         }
diff --git a/script/auth-header.js b/script/auth-header.js
index b8cf267..2459382 100644
--- a/script/auth-header.js
+++ b/script/auth-header.js
@@ -11,6 +11,18 @@
     let currentUser = null;
     let dropdownOpen = false;
 
+    /**
+     * @param {string} key
+     * @param {string} fallback
+     * @returns {string}
+     */
+    function t(key, fallback) {
+        if (window.UaPageI18n?.t) {
+            return window.UaPageI18n.t(key, fallback);
+        }
+        return fallback;
+    }
+
     /**
      * HTML 이스케이프
      * @param {string} str
@@ -51,6 +63,16 @@
         return src;
     }
 
+    /**
+     * 표시용 닉네임
+     * @param {object|null} user
+     * @returns {string}
+     */
+    function getDisplayName(user) {
+        if (!user) return '';
+        return String(user.username || user.displayName || '').trim();
+    }
+
     /**
      * 아바타 HTML
      * @param {object|null} user
@@ -62,18 +84,19 @@
     }
 
     /**
-     * 프로필 버튼 HTML (아바타 + 사용자명)
+     * 프로필 버튼 HTML (아바타 + 닉네임)
      * @param {object|null} user
      * @returns {string}
      */
     function profileBtnHtml(user) {
+        const name = getDisplayName(user);
         const avatar = avatarHtml(user);
-        if (!user?.username) {
-            return `<span class="auth-avatar-wrap">${avatar}</span>`;
+        if (!name) {
+            return `<span class="auth-avatar-circle">${avatar}</span>`;
         }
         return `
-            <span class="auth-avatar-wrap">${avatar}</span>
-            <span class="auth-username">${escapeHtml(user.username)}</span>
+            <span class="auth-avatar-circle">${avatar}</span>
+            <span class="auth-username">${escapeHtml(name)}</span>
         `;
     }
 
@@ -86,28 +109,28 @@
 
         if (!currentUser) {
             dd.innerHTML = `
-                <a href="/login.html" class="auth-dropdown-item">로그인</a>
-                <a href="/signup.html" class="auth-dropdown-item">회원가입</a>
+                <a href="/login.html" class="auth-dropdown-item">${escapeHtml(t('authLogin', '로그인'))}</a>
+                <a href="/signup.html" class="auth-dropdown-item">${escapeHtml(t('authSignup', '회원가입'))}</a>
             `;
             return;
         }
 
         const adminLink =
             currentUser.role === 'admin'
-                ? `<a href="/admin.html" class="auth-dropdown-item">관리자</a>`
+                ? `<a href="/admin.html" class="auth-dropdown-item">${escapeHtml(t('authAdmin', '관리자'))}</a>`
                 : '';
 
         dd.innerHTML = `
             <div class="auth-dropdown-header">
-                <div class="auth-dropdown-name">${currentUser.username}</div>
-                <div class="auth-dropdown-email">${currentUser.email || ''}</div>
+                <div class="auth-dropdown-name">${escapeHtml(getDisplayName(currentUser))}</div>
+                <div class="auth-dropdown-email">${escapeHtml(currentUser.email || '')}</div>
             </div>
-            <a href="/profile.html" class="auth-dropdown-item">내 프로필</a>
-            <a href="/deckHistory.html" class="auth-dropdown-item">내 덱 관리</a>
-            <a href="/preset.html" class="auth-dropdown-item">공개 덱</a>
+            <a href="/profile.html" class="auth-dropdown-item">${escapeHtml(t('authMyProfile', '내 프로필'))}</a>
+            <a href="/deckHistory.html" class="auth-dropdown-item">${escapeHtml(t('authMyDecks', '내 덱 관리'))}</a>
+            <a href="/preset.html" class="auth-dropdown-item">${escapeHtml(t('authPublicDecks', '공개 덱'))}</a>
             ${adminLink}
             <div class="auth-dropdown-divider"></div>
-            <button type="button" class="auth-dropdown-item danger" id="auth-logout-btn">로그아웃</button>
+            <button type="button" class="auth-dropdown-item danger" id="auth-logout-btn">${escapeHtml(t('authLogout', '로그아웃'))}</button>
         `;
 
         const logoutBtn = document.getElementById('auth-logout-btn');
@@ -127,8 +150,14 @@
     function renderHeader() {
         const btn = document.getElementById('auth-avatar-btn');
         if (btn) {
+            const name = getDisplayName(currentUser);
             btn.innerHTML = profileBtnHtml(currentUser);
-            btn.classList.toggle('auth-profile-btn--named', Boolean(currentUser?.username));
+            btn.classList.toggle('auth-profile-trigger--named', Boolean(name));
+            btn.classList.toggle('auth-profile-trigger--guest', !name);
+            const menuLabel = name
+                ? t('authAccountMenuNamed', '{name} 계정 메뉴').replace('{name}', name)
+                : t('authAccountMenu', '계정 메뉴');
+            btn.setAttribute('aria-label', menuLabel);
         }
         renderDropdown();
     }
@@ -140,7 +169,7 @@
     function mount(slot) {
         slot.innerHTML = `
             <div class="auth-header-wrap">
-                <button type="button" id="auth-avatar-btn" class="auth-avatar-btn" aria-label="계정 메뉴">
+                <button type="button" id="auth-avatar-btn" class="auth-profile-trigger auth-profile-trigger--guest" aria-label="${escapeHtml(t('authAccountMenu', '계정 메뉴'))}">
                     ${profileBtnHtml(currentUser)}
                 </button>
                 <div id="auth-dropdown" class="auth-dropdown"></div>
@@ -185,6 +214,10 @@
      * 초기화
      */
     async function init() {
+        if (window.UaPageI18n?.applyPageI18n) {
+            await window.UaPageI18n.applyPageI18n();
+        }
+
         currentUser = window.UaDeckApi.getCachedUser();
         await refreshCurrentUser();
 
diff --git a/script/deck-favorites.js b/script/deck-favorites.js
new file mode 100644
index 0000000..6d6a7c9
--- /dev/null
+++ b/script/deck-favorites.js
@@ -0,0 +1,60 @@
+/**
+ * 덱 즐겨찾기 (localStorage, share_code 기준)
+ */
+(function initDeckFavorites() {
+    const STORAGE_KEY = 'uadeck.deckFavorites';
+
+    /**
+     * @returns {Set<string>}
+     */
+    function readSet() {
+        try {
+            const raw = localStorage.getItem(STORAGE_KEY);
+            const list = raw ? JSON.parse(raw) : [];
+            return new Set(Array.isArray(list) ? list : []);
+        } catch {
+            return new Set();
+        }
+    }
+
+    /**
+     * @param {Set<string>} set
+     */
+    function writeSet(set) {
+        localStorage.setItem(STORAGE_KEY, JSON.stringify([...set]));
+    }
+
+    /**
+     * @param {string} shareCode
+     * @returns {boolean}
+     */
+    function isFavorite(shareCode) {
+        if (!shareCode) return false;
+        return readSet().has(shareCode);
+    }
+
+    /**
+     * @param {string} shareCode
+     * @returns {boolean} 토글 후 즐겨찾기 여부
+     */
+    function toggle(shareCode) {
+        if (!shareCode) return false;
+        const set = readSet();
+        if (set.has(shareCode)) {
+            set.delete(shareCode);
+        } else {
+            set.add(shareCode);
+        }
+        writeSet(set);
+        return set.has(shareCode);
+    }
+
+    /**
+     * @returns {string[]}
+     */
+    function getAll() {
+        return [...readSet()];
+    }
+
+    window.UaDeckFavorites = { isFavorite, toggle, getAll };
+})();
diff --git a/script/deck-preview-hold.js b/script/deck-preview-hold.js
new file mode 100644
index 0000000..ca9a4b4
--- /dev/null
+++ b/script/deck-preview-hold.js
@@ -0,0 +1,179 @@
+/**
+ * 썸네일 미리보기 확대 (클릭 고정 / 길게 누르기)
+ */
+(function initDeckPreviewHold() {
+    /** @type {HTMLElement|null} */
+    let overlay = null;
+
+    /** @type {number} */
+    let pressStartAt = 0;
+
+    /** @type {boolean} */
+    let suppressClick = false;
+
+    /** @type {number} */
+    const HOLD_THRESHOLD_MS = 280;
+
+    /**
+     * @returns {HTMLElement}
+     */
+    function ensureOverlay() {
+        if (!overlay) {
+            overlay = document.createElement('div');
+            overlay.className = 'deck-preview-hold-overlay hidden';
+            overlay.setAttribute('role', 'dialog');
+            overlay.setAttribute('aria-modal', 'true');
+            overlay.innerHTML =
+                '<div class="deck-preview-hold-box"><img alt="" draggable="false" /></div>';
+            overlay.addEventListener('click', (e) => {
+                if (e.target === overlay) hide();
+            });
+            document.body.appendChild(overlay);
+        }
+        return overlay;
+    }
+
+    /**
+     * @returns {boolean}
+     */
+    function isVisible() {
+        return Boolean(overlay && !overlay.classList.contains('hidden'));
+    }
+
+    /**
+     * @param {string} src
+     */
+    function show(src) {
+        if (!src) return;
+        const el = ensureOverlay();
+        const img = el.querySelector('img');
+        if (img) img.src = src;
+        el.classList.remove('hidden');
+    }
+
+    function hide() {
+        if (overlay) overlay.classList.add('hidden');
+        pressStartAt = 0;
+        suppressClick = false;
+    }
+
+    /**
+     * @param {Event} e
+     * @returns {HTMLElement|null}
+     */
+    function findHoldTarget(e) {
+        const target = e.target;
+        if (!(target instanceof Element)) return null;
+        return target.closest('[data-hold-preview]');
+    }
+
+    /**
+     * @param {HTMLElement} hold
+     * @returns {string}
+     */
+    function getPreviewSrc(hold) {
+        return hold.dataset.previewSrc || '';
+    }
+
+    function initGlobal() {
+        if (document.documentElement.dataset.deckHoldInit === '1') return;
+        document.documentElement.dataset.deckHoldInit = '1';
+
+        document.addEventListener(
+            'pointerdown',
+            (e) => {
+                const hold = findHoldTarget(e);
+                if (!hold) return;
+                const src = getPreviewSrc(hold);
+                if (!src) return;
+
+                pressStartAt = Date.now();
+                show(src);
+
+                if (hold.setPointerCapture && e.pointerId !== undefined) {
+                    try {
+                        hold.setPointerCapture(e.pointerId);
+                    } catch {
+                        /* ignore */
+                    }
+                }
+            },
+            true,
+        );
+
+        document.addEventListener(
+            'pointerup',
+            (e) => {
+                if (!pressStartAt) return;
+
+                const hold = findHoldTarget(e);
+                if (hold?.releasePointerCapture && e.pointerId !== undefined) {
+                    try {
+                        hold.releasePointerCapture(e.pointerId);
+                    } catch {
+                        /* ignore */
+                    }
+                }
+
+                const heldMs = Date.now() - pressStartAt;
+                pressStartAt = 0;
+
+                if (heldMs >= HOLD_THRESHOLD_MS) {
+                    hide();
+                    suppressClick = true;
+                    window.setTimeout(() => {
+                        suppressClick = false;
+                    }, 0);
+                } else {
+                    suppressClick = true;
+                    window.setTimeout(() => {
+                        suppressClick = false;
+                    }, 400);
+                }
+            },
+            true,
+        );
+
+        document.addEventListener(
+            'pointercancel',
+            () => {
+                hide();
+            },
+            true,
+        );
+
+        document.addEventListener('click', (e) => {
+            if (suppressClick) return;
+
+            const hold = findHoldTarget(e);
+            if (hold) {
+                const src = getPreviewSrc(hold);
+                if (!src) return;
+                e.preventDefault();
+                e.stopPropagation();
+                if (isVisible()) hide();
+                else show(src);
+                return;
+            }
+
+            if (isVisible() && e.target === overlay) {
+                hide();
+            }
+        });
+
+        document.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape') hide();
+        });
+    }
+
+    /**
+     * @param {HTMLElement} _container
+     */
+    function bindHoldPreview(_container) {
+        initGlobal();
+    }
+
+    initGlobal();
+
+    window.UaDeckPreviewHold = { bindHoldPreview, hide };
+})();
diff --git a/script/page-help.js b/script/page-help.js
new file mode 100644
index 0000000..a164041
--- /dev/null
+++ b/script/page-help.js
@@ -0,0 +1,96 @@
+/**
+ * 페이지 제목 옆 ? 버튼 — 설명 툴팁
+ */
+(function initPageHelp() {
+    /** @type {HTMLElement|null} */
+    let activeTooltip = null;
+
+    /** @type {HTMLElement|null} */
+    let activeBtn = null;
+
+    function closeTooltip() {
+        if (activeTooltip) {
+            activeTooltip.remove();
+            activeTooltip = null;
+        }
+        if (activeBtn) {
+            activeBtn.setAttribute('aria-expanded', 'false');
+            activeBtn = null;
+        }
+    }
+
+    /**
+     * @param {HTMLElement} btn
+     * @param {string} text
+     */
+    function openTooltip(btn, text) {
+        if (!text) return;
+        closeTooltip();
+
+        const tip = document.createElement('div');
+        tip.className = 'page-help-tooltip';
+        tip.setAttribute('role', 'tooltip');
+        tip.id = `page-help-tip-${Date.now()}`;
+        tip.textContent = text;
+        document.body.appendChild(tip);
+        btn.setAttribute('aria-expanded', 'true');
+        btn.setAttribute('aria-describedby', tip.id);
+
+        const rect = btn.getBoundingClientRect();
+        const margin = 12;
+        let left = rect.left + window.scrollX;
+        const top = rect.bottom + window.scrollY + 8;
+        const tipWidth = tip.offsetWidth;
+
+        if (left + tipWidth > window.innerWidth - margin) {
+            left = window.innerWidth - tipWidth - margin;
+        }
+        left = Math.max(margin, left);
+
+        tip.style.top = `${top}px`;
+        tip.style.left = `${left}px`;
+
+        activeTooltip = tip;
+        activeBtn = btn;
+    }
+
+    /**
+     * @param {object} [translations]
+     */
+    function bindPageHelp(translations) {
+        const tFn = (key, fallback) => {
+            if (translations?.[key]) return translations[key];
+            if (window.UaPageI18n?.t) return window.UaPageI18n.t(key, fallback);
+            return fallback;
+        };
+
+        document.querySelectorAll('[data-i18n-tooltip]').forEach((btn) => {
+            const key = btn.dataset.i18nTooltip;
+            const text = tFn(key, '');
+            const helpLabel = tFn('pageHelpLabel', '페이지 안내');
+            btn.setAttribute('aria-label', text ? `${helpLabel}` : helpLabel);
+
+            if (btn.dataset.helpBound === '1') return;
+            btn.dataset.helpBound = '1';
+
+            btn.addEventListener('click', (e) => {
+                e.stopPropagation();
+                const current = tFn(key, '');
+                if (activeBtn === btn && activeTooltip) {
+                    closeTooltip();
+                    return;
+                }
+                openTooltip(btn, current);
+            });
+        });
+    }
+
+    document.addEventListener('click', closeTooltip);
+    document.addEventListener('keydown', (e) => {
+        if (e.key === 'Escape') closeTooltip();
+    });
+    window.addEventListener('scroll', closeTooltip, { passive: true });
+    window.addEventListener('resize', closeTooltip);
+
+    window.UaPageHelp = { bindPageHelp, closeTooltip };
+})();
diff --git a/script/page-i18n.js b/script/page-i18n.js
new file mode 100644
index 0000000..6880b42
--- /dev/null
+++ b/script/page-i18n.js
@@ -0,0 +1,72 @@
+/**
+ * data-i18n 속성 기반 페이지 번역
+ */
+(function initPageI18n() {
+    /**
+     * @returns {Promise<string>}
+     */
+    function getLang() {
+        const fromQuery = new URLSearchParams(window.location.search).get('lang');
+        if (fromQuery) return fromQuery;
+        return localStorage.getItem('lang') || 'ko';
+    }
+
+    /**
+     * @param {string} lang
+     * @returns {Promise<object>}
+     */
+    async function loadTranslations(lang) {
+        try {
+            const res = await fetch(`/i18n/translations.${lang}.json`);
+            if (!res.ok) return {};
+            return await res.json();
+        } catch {
+            return {};
+        }
+    }
+
+    let cachedTranslations = {};
+
+    /**
+     * @param {string} key
+     * @param {string} [fallback]
+     * @returns {string}
+     */
+    function t(key, fallback = '') {
+        return cachedTranslations[key] || fallback;
+    }
+
+    /**
+     * @param {object} translations
+     */
+    function applyTranslations(translations) {
+        document.querySelectorAll('[data-i18n]').forEach((el) => {
+            const key = el.dataset.i18n;
+            if (translations[key]) el.textContent = translations[key];
+        });
+        document.querySelectorAll('[data-i18n-html]').forEach((el) => {
+            const key = el.dataset.i18nHtml;
+            if (translations[key]) el.innerHTML = translations[key];
+        });
+        document.querySelectorAll('[data-i18n-placeholder]').forEach((el) => {
+            const key = el.dataset.i18nPlaceholder;
+            if (translations[key]) el.placeholder = translations[key];
+        });
+        if (window.UaPageHelp?.bindPageHelp) {
+            window.UaPageHelp.bindPageHelp(translations);
+        }
+    }
+
+    async function applyPageI18n() {
+        const lang = await getLang();
+        cachedTranslations = await loadTranslations(lang);
+        applyTranslations(cachedTranslations);
+        return cachedTranslations;
+    }
+
+    document.addEventListener('DOMContentLoaded', () => {
+        applyPageI18n();
+    });
+
+    window.UaPageI18n = { applyPageI18n, getLang, loadTranslations, t };
+})();
diff --git a/signup.html b/signup.html
index a0b5db4..df99924 100644
--- a/signup.html
+++ b/signup.html
@@ -20,33 +20,38 @@
 
         <main class="auth-main">
             <header class="auth-header">
-                <h1>회원가입</h1>
-                <p>UADECK 계정을 만들고<br />덱을 저장·공유해 보세요.</p>
+                <h1 data-i18n="signupPageTitle">회원가입</h1>
+                <p data-i18n-html="signupPageDesc">UADECK 계정을 만들고<br />덱을 저장·공유해 보세요.</p>
             </header>
 
             <form id="signup-form" class="auth-card">
                 <div class="auth-field">
-                    <label class="auth-label" for="email">이메일</label>
+                    <label class="auth-label" for="email" data-i18n="emailLabel">이메일</label>
                     <input type="email" id="email" required class="auth-input" placeholder="you@example.com" autocomplete="email" />
                 </div>
                 <div class="auth-field">
-                    <label class="auth-label" for="username">사용자명</label>
+                    <label class="auth-label" for="username" data-i18n="usernameLabel">사용자명</label>
                     <input type="text" id="username" required minlength="2" class="auth-input" placeholder="deckmaster" autocomplete="username" />
                 </div>
                 <div class="auth-field">
-                    <label class="auth-label" for="password">비밀번호</label>
-                    <input type="password" id="password" required minlength="8" class="auth-input" placeholder="8자 이상" autocomplete="new-password" />
+                    <label class="auth-label" for="password" data-i18n="passwordLabel">비밀번호</label>
+                    <input type="password" id="password" required minlength="8" class="auth-input" data-i18n-placeholder="signupPasswordPlaceholder" placeholder="8자 이상" autocomplete="new-password" />
+                </div>
+                <div class="auth-field">
+                    <label class="auth-label" for="password-confirm" data-i18n="passwordConfirmLabel">비밀번호 확인</label>
+                    <input type="password" id="password-confirm" required minlength="8" class="auth-input" data-i18n-placeholder="passwordConfirmPlaceholder" placeholder="비밀번호 재입력" autocomplete="new-password" />
                 </div>
                 <p id="error-msg" class="auth-error hidden"></p>
-                <button type="submit" class="auth-submit">가입하기</button>
+                <button type="submit" class="auth-submit" data-i18n="signupButton">가입하기</button>
             </form>
 
             <p class="auth-footer">
-                이미 계정이 있으신가요?
-                <a href="/login.html">로그인</a>
+                <span data-i18n="hasAccount">이미 계정이 있으신가요?</span>
+                <a href="/login.html" data-i18n="authLogin">로그인</a>
             </p>
         </main>
 
+        <script src="/script/page-i18n.js"></script>
         <script src="/script/api.js"></script>
         <script>
             document.getElementById('signup-form').addEventListener('submit', async (e) => {
@@ -54,14 +59,23 @@
                 const errEl = document.getElementById('error-msg');
                 errEl.classList.add('hidden');
                 try {
+                    const password = document.getElementById('password').value;
+                    const passwordConfirm = document.getElementById('password-confirm').value;
+                    if (password !== passwordConfirm) {
+                        const msg = window.UaPageI18n?.t('passwordMismatch', '비밀번호가 일치하지 않습니다.')
+                            || '비밀번호가 일치하지 않습니다.';
+                        errEl.textContent = msg;
+                        errEl.classList.remove('hidden');
+                        return;
+                    }
                     const body = {
                         email: document.getElementById('email').value,
                         username: document.getElementById('username').value,
-                        password: document.getElementById('password').value,
+                        password,
                     };
                     const { token, user } = await UaDeckApi.register(body);
                     UaDeckApi.saveAuth(token, user);
-                    location.href = '/deckHistory.html';
+                    location.href = '/';
                 } catch (err) {
                     errEl.textContent = err.message;
                     errEl.classList.remove('hidden');
diff --git a/style/admin.css b/style/admin.css
index e60f431..af5c10d 100644
--- a/style/admin.css
+++ b/style/admin.css
@@ -43,7 +43,6 @@
 .admin-main {
     max-width: 80rem;
     margin: 0 auto;
-    padding: 3rem 1.5rem 5rem;
 }
 
 @media (min-width: 640px) {
diff --git a/style/app-shell.css b/style/app-shell.css
index 87c5c14..6229c9d 100644
--- a/style/app-shell.css
+++ b/style/app-shell.css
@@ -101,6 +101,12 @@
     width: 100%;
 }
 
+.app-ad-slot--skyscraper:has(ins.adsbygoogle) {
+    min-height: auto;
+    border: none;
+    background: transparent;
+}
+
 .app-ad-slot ins {
     display: block;
     width: 100%;
@@ -130,3 +136,53 @@
         display: none;
     }
 }
+
+/* 페이지 제목 + ? 도움말 */
+.page-title-row {
+    display: flex;
+    align-items: center;
+    gap: 0.625rem;
+}
+
+.page-title-row h1 {
+    margin: 0;
+    flex: 1;
+    min-width: 0;
+}
+
+.page-help-btn {
+    flex-shrink: 0;
+    width: 1.625rem;
+    height: 1.625rem;
+    border-radius: 50%;
+    border: 1px solid #cbd5e1;
+    background: #f8fafc;
+    color: #64748b;
+    font-size: 0.75rem;
+    font-weight: 800;
+    cursor: pointer;
+    line-height: 1;
+    padding: 0;
+    transition: background 0.2s, border-color 0.2s, color 0.2s;
+}
+
+.page-help-btn:hover,
+.page-help-btn[aria-expanded='true'] {
+    background: #eff6ff;
+    border-color: #93c5fd;
+    color: #2563eb;
+}
+
+.page-help-tooltip {
+    position: absolute;
+    z-index: 300;
+    max-width: min(22rem, calc(100vw - 2rem));
+    padding: 0.75rem 1rem;
+    font-size: 0.8125rem;
+    line-height: 1.55;
+    color: #334155;
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 0.75rem;
+    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
+}
diff --git a/style/auth-header.css b/style/auth-header.css
index 12225d1..9be9934 100644
--- a/style/auth-header.css
+++ b/style/auth-header.css
@@ -2,68 +2,69 @@
     position: relative;
 }
 
-.auth-avatar-btn {
+.auth-profile-trigger {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+    max-width: 12.5rem;
+    padding: 0.125rem 0.5rem 0.125rem 0.125rem;
+    border: none;
+    border-radius: 9999px;
+    background: transparent;
+    cursor: pointer;
+    transition: background 0.2s, box-shadow 0.2s;
+}
+
+.auth-profile-trigger:hover {
+    background: #f1f5f9;
+}
+
+.auth-profile-trigger:focus-visible {
+    outline: none;
+    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
+}
+
+.auth-profile-trigger--guest {
+    padding: 0;
+}
+
+.auth-profile-trigger--named {
+    padding-right: 0.625rem;
+}
+
+.auth-avatar-circle {
+    flex-shrink: 0;
+    width: 36px;
     height: 36px;
     border-radius: 9999px;
     border: 2px solid #e2e8f0;
     background: #f1f5f9;
-    cursor: pointer;
-    overflow: hidden;
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    gap: 0;
-    padding: 0;
-    transition: border-color 0.2s, box-shadow 0.2s;
-}
-
-.auth-avatar-btn.auth-profile-btn--named {
-    padding-right: 12px;
-    gap: 8px;
-    max-width: 180px;
-}
-
-.auth-avatar-btn:hover {
-    border-color: #3b82f6;
-    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
-}
-
-.auth-avatar-wrap {
-    flex-shrink: 0;
-    width: 32px;
-    height: 32px;
-    margin: 2px;
-    border-radius: 9999px;
     overflow: hidden;
     display: flex;
     align-items: center;
     justify-content: center;
+    transition: border-color 0.2s;
 }
 
-.auth-avatar-wrap img {
+.auth-profile-trigger:hover .auth-avatar-circle {
+    border-color: #3b82f6;
+}
+
+.auth-avatar-circle img {
     width: 100%;
     height: 100%;
     object-fit: cover;
 }
 
 .auth-username {
-    font-size: 13px;
+    font-size: 0.8125rem;
     font-weight: 700;
     color: #334155;
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;
     min-width: 0;
-}
-
-.auth-avatar-btn:not(.auth-profile-btn--named) {
-    width: 36px;
-}
-
-.auth-avatar-btn:not(.auth-profile-btn--named) .auth-avatar-wrap {
-    width: 100%;
-    height: 100%;
-    margin: 0;
+    line-height: 1.2;
 }
 
 .auth-dropdown {
diff --git a/style/deck-history.css b/style/deck-history.css
index a2d1b3e..3991488 100644
--- a/style/deck-history.css
+++ b/style/deck-history.css
@@ -18,22 +18,17 @@
     font-size: 1.75rem;
     font-weight: 900;
     color: #0f172a;
-    margin: 0 0 0.5rem;
     letter-spacing: -0.02em;
 }
 
-.deck-history-header p {
-    font-size: 0.875rem;
-    color: #64748b;
-    margin: 0;
-    line-height: 1.5;
+.deck-history-header .page-title-row {
+    margin-bottom: 0;
 }
 
 .deck-history-toolbar {
     display: flex;
-    flex-wrap: wrap;
+    flex-direction: column;
     gap: 0.75rem;
-    align-items: center;
     margin-bottom: 1.5rem;
     padding: 1rem 1.25rem;
     background: #fff;
@@ -46,9 +41,36 @@
     display: none;
 }
 
-.deck-search-input {
+.deck-toolbar-fav-row {
+    display: flex;
+    width: 100%;
+    padding-bottom: 0.75rem;
+    border-bottom: 1px solid #f1f5f9;
+}
+
+.deck-toolbar-main-row {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.75rem;
+    align-items: center;
+    width: 100%;
+}
+
+.deck-toolbar-main-row .deck-search-input {
     flex: 1 1 12rem;
     min-width: 0;
+}
+
+.deck-toolbar-main-row .deck-series-select {
+    flex: 0 1 11rem;
+    min-width: 9rem;
+}
+
+.deck-toolbar-main-row .deck-count-label {
+    margin-left: auto;
+}
+
+.deck-search-input {
     border: 1px solid #e2e8f0;
     border-radius: 0.75rem;
     padding: 0.625rem 1rem;
@@ -70,8 +92,6 @@
 }
 
 .deck-series-select {
-    flex: 0 1 11rem;
-    min-width: 9rem;
     border: 1px solid #e2e8f0;
     border-radius: 0.75rem;
     padding: 0.625rem 2rem 0.625rem 1rem;
@@ -97,6 +117,74 @@
     white-space: nowrap;
 }
 
+.deck-favorite-filter {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    width: 100%;
+    padding: 0.625rem 1rem;
+    border: 1px solid #fde68a;
+    border-radius: 0.75rem;
+    font-size: 0.8125rem;
+    font-weight: 700;
+    color: #92400e;
+    background: #fffbeb;
+    cursor: pointer;
+    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
+}
+
+.deck-favorite-filter:hover {
+    background: #fef3c7;
+    border-color: #fcd34d;
+}
+
+.deck-favorite-filter[aria-pressed='true'] {
+    color: #78350f;
+    background: #fef08a;
+    border-color: #f59e0b;
+    box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.35);
+}
+
+.deck-favorite-filter-icon {
+    font-size: 1.125rem;
+    line-height: 1;
+    color: #f59e0b;
+}
+
+.deck-favorite-filter .deck-star-icon {
+    color: #fbbf24;
+}
+
+.deck-favorite-filter .deck-star-icon.is-on {
+    color: #d97706;
+}
+
+.deck-fav-count {
+    margin-left: auto;
+    font-size: 0.75rem;
+    font-weight: 800;
+    color: #b45309;
+}
+
+.deck-star-icon {
+    display: inline-block;
+    font-size: 1rem;
+    line-height: 1;
+    color: #cbd5e1;
+}
+
+.deck-star-icon::before {
+    content: '☆';
+}
+
+.deck-star-icon.is-on {
+    color: #f59e0b;
+}
+
+.deck-star-icon.is-on::before {
+    content: '★';
+}
+
 .deck-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
@@ -117,7 +205,7 @@
     background: #fff;
     border: 1px solid #e2e8f0;
     border-radius: 1rem;
-    overflow: hidden;
+    overflow: visible;
     box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
     transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
 }
@@ -128,12 +216,18 @@
     transform: translateY(-2px);
 }
 
+.deck-card.is-favorite {
+    border-color: #fcd34d;
+    box-shadow: 0 2px 12px rgba(245, 158, 11, 0.12);
+}
+
 .deck-card-preview {
     position: relative;
     aspect-ratio: 16 / 9;
     background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
     border-bottom: 1px solid #e2e8f0;
     overflow: hidden;
+    border-radius: 1rem 1rem 0 0;
 }
 
 .deck-card-preview img {
@@ -141,7 +235,18 @@
     height: 100%;
     object-fit: contain;
     object-position: center;
-    background: #f8fafc;
+    background-color: #ffffff;
+}
+
+.deck-card-preview--holdable {
+    cursor: zoom-in;
+    user-select: none;
+    -webkit-user-select: none;
+    touch-action: manipulation;
+}
+
+.deck-card-preview--holdable:active {
+    opacity: 0.92;
 }
 
 .deck-card-preview-placeholder {
@@ -213,6 +318,83 @@
     gap: 0.5rem;
     margin-top: auto;
     padding-top: 0.5rem;
+    align-items: center;
+}
+
+.deck-card-actions--primary .deck-card-btn-load {
+    flex: 1.4;
+}
+
+.deck-card-more-wrap {
+    position: relative;
+    flex: 0 0 auto;
+}
+
+.deck-card-more-btn {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 2.25rem;
+    height: 2.25rem;
+    padding: 0;
+    border: 1px solid #e2e8f0;
+    border-radius: 0.625rem;
+    background: #f8fafc;
+    color: #64748b;
+    cursor: pointer;
+    transition: background 0.2s, border-color 0.2s, color 0.2s;
+}
+
+.deck-card-more-btn:hover,
+.deck-card-more-btn[aria-expanded='true'] {
+    background: #fff;
+    border-color: #cbd5e1;
+    color: #334155;
+}
+
+.deck-card-more-menu {
+    position: absolute;
+    right: 0;
+    top: calc(100% + 0.35rem);
+    z-index: 20;
+    min-width: 9.5rem;
+    padding: 0.35rem;
+    background: #fff;
+    border: 1px solid #e2e8f0;
+    border-radius: 0.75rem;
+    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
+}
+
+.deck-card-more-menu.hidden {
+    display: none;
+}
+
+.deck-card-more-item {
+    display: block;
+    width: 100%;
+    padding: 0.55rem 0.75rem;
+    border: none;
+    border-radius: 0.5rem;
+    background: transparent;
+    color: #334155;
+    font-size: 0.75rem;
+    font-weight: 600;
+    text-align: left;
+    cursor: pointer;
+    white-space: nowrap;
+    transition: background 0.15s;
+}
+
+.deck-card-more-item:hover {
+    background: #f1f5f9;
+}
+
+.deck-card-more-item--danger {
+    color: #dc2626;
+}
+
+.deck-card-more-item--danger:hover {
+    background: #fef2f2;
 }
 
 .deck-card-btn {
@@ -240,6 +422,31 @@
     background: #1d4ed8;
 }
 
+.deck-card-btn-favorite {
+    background: #fffbeb;
+    color: #92400e;
+    border: 1px solid #fde68a;
+}
+
+.deck-card-btn-favorite:hover {
+    background: #fef3c7;
+    border-color: #fcd34d;
+}
+
+.deck-card-btn-favorite.is-on {
+    background: #fef08a;
+    color: #78350f;
+    border-color: #f59e0b;
+}
+
+.deck-card-btn-favorite.is-on:hover {
+    background: #fde047;
+}
+
+.deck-card-btn-favorite .deck-star-icon {
+    margin-right: 0.15rem;
+}
+
 .deck-card-btn-copy {
     background: #f1f5f9;
     color: #475569;
@@ -316,3 +523,39 @@
 .deck-status-message.error {
     color: #ef4444;
 }
+
+.deck-preview-hold-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 200;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 1.5rem;
+    background: rgba(15, 23, 42, 0.72);
+    backdrop-filter: blur(4px);
+    cursor: zoom-out;
+}
+
+.deck-preview-hold-overlay.hidden {
+    display: none;
+}
+
+.deck-preview-hold-box {
+    max-width: min(92vw, 56rem);
+    max-height: min(88vh, 40rem);
+    background: #fff;
+    border-radius: 1rem;
+    padding: 0.75rem;
+    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.25);
+}
+
+.deck-preview-hold-box img {
+    display: block;
+    max-width: 100%;
+    max-height: min(84vh, 38rem);
+    width: auto;
+    height: auto;
+    margin: 0 auto;
+    object-fit: contain;
+}
diff --git a/style/profile.css b/style/profile.css
index 253fd5d..29cdfdf 100644
--- a/style/profile.css
+++ b/style/profile.css
@@ -15,19 +15,16 @@
     margin-bottom: 1.5rem;
 }
 
+.profile-header .page-title-row {
+    margin-bottom: 0;
+}
+
 .profile-header h1 {
-    margin: 0 0 0.5rem;
     font-size: 1.75rem;
     font-weight: 900;
     letter-spacing: -0.02em;
 }
 
-.profile-header p {
-    margin: 0;
-    font-size: 0.875rem;
-    color: #64748b;
-}
-
 .profile-card {
     background: #fff;
     border: 1px solid #e2e8f0;
@@ -163,12 +160,32 @@
 }
 
 .profile-section-title {
-    margin: 0 0 0.375rem;
-    font-size: 0.9375rem;
+    margin: 0;
+    font-size: 1rem;
     font-weight: 800;
     color: #0f172a;
 }
 
+.profile-section-head {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    margin-bottom: 0.75rem;
+}
+
+.profile-section-head .profile-section-title {
+    flex: 1;
+    min-width: 0;
+}
+
+.profile-settings-panel {
+    margin-bottom: 0.5rem;
+    padding: 0.25rem 1rem;
+    background: #f8fafc;
+    border: 1px solid #e2e8f0;
+    border-radius: 1rem;
+}
+
 .profile-section-desc {
     margin: 0 0 1rem;
     font-size: 0.8125rem;
@@ -180,35 +197,64 @@
     align-items: center;
     justify-content: space-between;
     gap: 1rem;
-    padding: 0.75rem 0;
+    padding: 0.875rem 0;
 }
 
 .profile-toggle-row + .profile-toggle-row {
-    border-top: 1px solid #f1f5f9;
+    border-top: 1px solid #e2e8f0;
+}
+
+.profile-toggle-text {
+    flex: 1;
+    min-width: 0;
+    cursor: pointer;
 }
 
 .profile-toggle-label {
+    display: block;
     font-size: 0.875rem;
-    font-weight: 600;
-    color: #334155;
+    font-weight: 700;
+    color: #0f172a;
 }
 
 .profile-toggle-hint {
+    display: block;
+    font-size: 0.75rem;
+    color: #64748b;
+    margin-top: 0.2rem;
+    line-height: 1.4;
+}
+
+.profile-toggle-wrap {
+    display: flex;
+    flex-shrink: 0;
+    align-items: center;
+    gap: 0.5rem;
+}
+
+.profile-toggle-state {
+    min-width: 1.75rem;
     font-size: 0.6875rem;
+    font-weight: 800;
+    letter-spacing: 0.04em;
+    text-align: right;
     color: #94a3b8;
-    margin-top: 0.125rem;
+}
+
+.profile-toggle-state.is-on {
+    color: #2563eb;
 }
 
 .profile-toggle {
     position: relative;
     flex-shrink: 0;
     display: inline-flex;
-    width: 2.75rem;
-    height: 1.5rem;
+    width: 3rem;
+    height: 1.625rem;
     align-items: center;
     border: none;
     border-radius: 9999px;
-    background: #e2e8f0;
+    background: #cbd5e1;
     cursor: pointer;
     transition: background 0.2s;
     padding: 0;
@@ -218,19 +264,37 @@
     background: #2563eb;
 }
 
+.profile-toggle:focus-visible {
+    outline: 2px solid #93c5fd;
+    outline-offset: 2px;
+}
+
 .profile-toggle-circle {
     display: inline-block;
-    width: 1rem;
-    height: 1rem;
+    width: 1.25rem;
+    height: 1.25rem;
     border-radius: 9999px;
     background: #fff;
-    transform: translateX(0.25rem);
+    transform: translateX(0.2rem);
     transition: transform 0.2s;
-    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.15);
+    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.2);
+    pointer-events: none;
 }
 
 .profile-toggle-circle.is-on {
-    transform: translateX(1.5rem);
+    transform: translateX(1.55rem);
+}
+
+.profile-prefs-notice {
+    margin: 0.5rem 0 0;
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: #059669;
+    min-height: 1.125rem;
+}
+
+.profile-prefs-notice:empty {
+    display: none;
 }
 
 .profile-btn-outline {