diff --git a/public/app.js b/public/app.js
deleted file mode 100644
index a5d7302..0000000
--- a/public/app.js
+++ /dev/null
@@ -1,385 +0,0 @@
-/* AI DEV 포털 — 클라이언트 상호작용 (프레임워크 없음, 점진적 향상).
- * JS 가 없어도 폼 POST 로 동작하고, 있으면 여기서 즉시 반영/모달/이펙트를 더한다.
- *
- * DOM 계약 (대시보드 EJS 가 맞춰 렌더):
- *  - 카드: <article class="fcard|pcard" data-open-id="3" data-search="텍스트"
- *           data-created="2026-06-25" data-pop="31" data-starred="true|false"
- *           data-vis="public|private"> ... </article>
- *  - 반응 버튼: <button data-react data-id="3" data-kind="heart|star" class="...on?">
- *               <span class="ico ico-on">…</span><span class="ico ico-off">…</span>
- *               <span class="count" data-rcount>19</span></button>
- *  - 상세 모달 내용 저장소: <div id="detailStore"><template data-detail-id="3">…</template></div>
- *  - 답글 버튼: <button data-reply-to="11" data-reply-name="0298211">
- *  - 토스트/이펙트 신호: body[data-toast], body[data-egg]
- */
-(function () {
-  "use strict";
-  var $ = function (s, r) { return (r || document).querySelector(s); };
-  var $$ = function (s, r) { return Array.prototype.slice.call((r || document).querySelectorAll(s)); };
-  var EGGS_ON = true;
-
-  /* ---------------- 테마 ---------------- */
-  function applyTheme(t) { document.documentElement.setAttribute("data-aidev-theme", t); }
-  function initTheme() {
-    var btn = $("#themeToggle");
-    if (!btn) return;
-    btn.addEventListener("click", function () {
-      var cur = document.documentElement.getAttribute("data-aidev-theme") === "dark" ? "dark" : "light";
-      var next = cur === "dark" ? "light" : "dark";
-      applyTheme(next);
-      try { localStorage.setItem("aidev-theme", next); } catch (e) {}
-    });
-  }
-
-  /* ---------------- 사용자 메뉴 ---------------- */
-  function initUserMenu() {
-    var btn = $("#userMenuBtn"), pop = $("#userMenuPop");
-    if (!btn || !pop) return;
-    btn.addEventListener("click", function (e) {
-      e.stopPropagation();
-      var open = pop.hidden;
-      pop.hidden = !open;
-      btn.setAttribute("aria-expanded", open ? "true" : "false");
-    });
-    document.addEventListener("click", function (e) {
-      if (!pop.hidden && !pop.contains(e.target) && !btn.contains(e.target)) {
-        pop.hidden = true; btn.setAttribute("aria-expanded", "false");
-      }
-    });
-  }
-
-  /* ---------------- 토스트 ---------------- */
-  var toastTimer = null;
-  function toast(msg) {
-    if (!msg) return;
-    var old = $(".toast"); if (old) old.remove();
-    var t = document.createElement("div");
-    t.className = "toast";
-    t.innerHTML = '<span class="toast-ico">' + CHECK_SVG + "</span>";
-    t.appendChild(document.createTextNode(msg));
-    document.body.appendChild(t);
-    if (toastTimer) clearTimeout(toastTimer);
-    toastTimer = setTimeout(function () { if (t.parentNode) t.remove(); }, 2700);
-  }
-  var CHECK_SVG = '<svg width="14" height="14" viewBox="0 0 16 16" fill="#3fb950" aria-hidden="true"><path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L1.72 8.78a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"/></svg>';
-
-  /* ---------------- 이스터에그 (이모지 날리기) ---------------- */
-  var flyId = 0;
-  function flyLayer() {
-    var l = $(".flyers");
-    if (!l) { l = document.createElement("div"); l.className = "flyers"; document.body.appendChild(l); }
-    return l;
-  }
-  function addFlyer(content, style, ttl) {
-    var span = document.createElement("span");
-    span.className = "flyer"; span.textContent = content;
-    Object.keys(style).forEach(function (k) { span.style[k] = style[k]; });
-    var l = flyLayer(); l.appendChild(span);
-    var id = ++flyId; span._id = id;
-    setTimeout(function () { if (span.parentNode) span.remove(); }, ttl);
-  }
-  function burstThumbs() {
-    if (!EGGS_ON) return;
-    var cx = window.innerWidth / 2;
-    for (var i = 0; i < 6; i++) {
-      var dx = (Math.random() - 0.5) * 180;
-      addFlyer("👍", {
-        left: (cx + dx) + "px", top: (window.innerHeight * 0.62) + "px",
-        fontSize: (22 + Math.random() * 14) + "px",
-        animation: "aidev-flyup " + (0.9 + Math.random() * 0.3) + "s ease-out " + (i * 60) + "ms forwards",
-        opacity: 0,
-      }, 1500);
-    }
-  }
-  function burstRocket() {
-    if (!EGGS_ON) return;
-    addFlyer("🚀", {
-      left: "-40px", top: (window.innerHeight * (0.18 + Math.random() * 0.2)) + "px",
-      fontSize: "34px", animation: "aidev-rocket 1.1s ease-in forwards",
-    }, 1300);
-  }
-  function burstSparkle(x, y) {
-    if (!EGGS_ON) return;
-    var chars = ["✨", "⭐", "💫"];
-    for (var i = 0; i < 7; i++) {
-      var dx = (Math.random() - 0.5) * 90, dy = (Math.random() - 0.5) * 90;
-      addFlyer(chars[i % 3], {
-        left: (x + dx) + "px", top: (y + dy) + "px",
-        fontSize: (12 + Math.random() * 12) + "px",
-        animation: "aidev-sparkle " + (0.5 + Math.random() * 0.3) + "s ease-out forwards",
-      }, 900);
-    }
-  }
-
-  /* 로고 이스터에그: 4번 빠르게 클릭하면 흔들림 + 👍 (단일 클릭은 홈 이동) */
-  function initLogoEgg() {
-    var logo = $("#brandLink");
-    if (!logo) return;
-    var clicks = 0, timer = null, navTimer = null;
-    var mark = $(".brand-mark", logo);
-    logo.addEventListener("click", function (e) {
-      e.preventDefault();
-      clicks++;
-      clearTimeout(timer);
-      timer = setTimeout(function () { clicks = 0; }, 700);
-      if (navTimer) clearTimeout(navTimer);
-      if (clicks >= 4) {
-        clicks = 0;
-        if (mark) {
-          mark.style.animation = "aidev-shake .5s ease";
-          var old = mark.style.filter;
-          mark.style.filter = "hue-rotate(180deg) saturate(1.5)";
-          setTimeout(function () { mark.style.animation = ""; mark.style.filter = old; }, 520);
-        }
-        burstThumbs();
-        toast('🌈 git commit -m "found an easter egg"');
-        return;
-      }
-      // 추가 클릭이 없으면 잠시 뒤 홈으로 이동
-      navTimer = setTimeout(function () { window.location.href = logo.getAttribute("href") || "/"; }, 320);
-    });
-  }
-
-  /* ---------------- 반응(❤️/⭐) fetch 토글 ---------------- */
-  function initReactions() {
-    document.addEventListener("click", function (e) {
-      var btn = e.target.closest("[data-react]");
-      if (!btn) return;
-      e.preventDefault();
-      e.stopPropagation();
-      var id = btn.getAttribute("data-id");
-      var kind = btn.getAttribute("data-kind"); // heart | star
-      // 별 빠르게 4탭 → 반짝
-      if (kind === "star") {
-        starTaps = (starTaps || []).filter(function (t) { return Date.now() - t < 1400; });
-        starTaps.push(Date.now());
-        if (starTaps.length >= 4) burstSparkle(e.clientX, e.clientY);
-      }
-      fetch("/projects/" + id + "/" + kind, {
-        method: "POST",
-        headers: { "X-Requested-With": "fetch", "Accept": "application/json" },
-      })
-        .then(function (r) { return r.ok ? r.json() : Promise.reject(r.status); })
-        .then(function (data) { syncReaction(id, kind, data.on, data.count); })
-        .catch(function () { toast("처리에 실패했습니다. 다시 시도해 주세요."); });
-    });
-  }
-  var starTaps = [];
-  function syncReaction(id, kind, on, count) {
-    $$('[data-react][data-id="' + id + '"][data-kind="' + kind + '"]').forEach(function (b) {
-      b.classList.toggle("on", !!on);
-      var c = $(".count", b);
-      if (c) c.textContent = count;
-    });
-  }
-
-  /* ---------------- 상세 모달 ---------------- */
-  function openDetail(id) {
-    var tpl = $('#detailStore template[data-detail-id="' + id + '"]');
-    var overlay = $("#detailModal");
-    if (!tpl || !overlay) { window.location.href = "/projects/" + id; return; }
-    var mount = $(".modal", overlay) || overlay;
-    mount.innerHTML = tpl.innerHTML;
-    overlay.hidden = false;
-    document.body.style.overflow = "hidden";
-    overlay.setAttribute("data-open-id", id);
-    var ta = $(".comment-input", overlay);
-    if (ta) ta.focus();
-  }
-  function closeDetail() {
-    var overlay = $("#detailModal");
-    if (!overlay || overlay.hidden) return;
-    overlay.hidden = true;
-    overlay.removeAttribute("data-open-id");
-    document.body.style.overflow = "";
-  }
-  function initDetailModal() {
-    document.addEventListener("click", function (e) {
-      var opener = e.target.closest("[data-open-id]");
-      if (opener && !e.target.closest("[data-react]") && !e.target.closest("a") && !e.target.closest("[data-stop]")) {
-        e.preventDefault();
-        openDetail(opener.getAttribute("data-open-id"));
-        return;
-      }
-      if (e.target.closest("[data-close-detail]")) { e.preventDefault(); closeDetail(); return; }
-      var overlay = $("#detailModal");
-      if (overlay && !overlay.hidden && e.target === overlay) closeDetail();
-    });
-    document.addEventListener("keydown", function (e) { if (e.key === "Escape") { closeDetail(); closeShare(); } });
-  }
-
-  /* ---------------- 댓글: 답글 타깃 / Enter 등록 / 삭제 확인 ---------------- */
-  function initComments() {
-    document.addEventListener("click", function (e) {
-      var rb = e.target.closest("[data-reply-to]");
-      if (rb) {
-        e.preventDefault();
-        var scope = rb.closest(".modal") || document;
-        var parentInput = $('input[name="parent_id"]', scope);
-        var banner = $(".reply-banner", scope);
-        var ta = $(".comment-input", scope);
-        if (parentInput) parentInput.value = rb.getAttribute("data-reply-to");
-        if (banner) {
-          banner.hidden = false;
-          var who = $(".reply-banner-name", banner);
-          if (who) who.textContent = rb.getAttribute("data-reply-name") || "";
-        }
-        if (ta) { ta.placeholder = "답글을 입력하세요…"; ta.focus(); }
-        return;
-      }
-      if (e.target.closest("[data-cancel-reply]")) {
-        e.preventDefault();
-        var scope2 = e.target.closest(".modal") || document;
-        var pi = $('input[name="parent_id"]', scope2); if (pi) pi.value = "";
-        var bn = $(".reply-banner", scope2); if (bn) bn.hidden = true;
-        var ta2 = $(".comment-input", scope2); if (ta2) ta2.placeholder = "댓글을 입력하세요…";
-        return;
-      }
-      var del = e.target.closest("[data-confirm]");
-      if (del) {
-        if (!window.confirm(del.getAttribute("data-confirm"))) e.preventDefault();
-      }
-    });
-    // Enter 등록 / Shift+Enter 줄바꿈
-    document.addEventListener("keydown", function (e) {
-      var ta = e.target;
-      if (ta && ta.classList && ta.classList.contains("comment-input") && e.key === "Enter" && !e.shiftKey) {
-        e.preventDefault();
-        var form = ta.closest("form");
-        if (form && ta.value.trim()) form.submit();
-      }
-    });
-  }
-
-  /* ---------------- 공유(등록) 모달 ---------------- */
-  function openShare() {
-    var m = $("#shareModal"); if (!m) return;
-    m.hidden = false; document.body.style.overflow = "hidden";
-    var t = $('input[name="title"]', m); if (t) t.focus();
-  }
-  function closeShare() {
-    var m = $("#shareModal"); if (!m || m.hidden) return;
-    m.hidden = true; document.body.style.overflow = "";
-  }
-  function initShare() {
-    document.addEventListener("click", function (e) {
-      if (e.target.closest("[data-open-share]")) { e.preventDefault(); openShare(); return; }
-      if (e.target.closest("[data-close-share]")) { e.preventDefault(); closeShare(); return; }
-      var m = $("#shareModal");
-      if (m && !m.hidden && e.target === m) closeShare();
-      // 공개/비공개 토글
-      var vo = e.target.closest("[data-vis]");
-      if (vo && m) {
-        var val = vo.getAttribute("data-vis");
-        var input = $('input[name="is_public"]', m);
-        if (input) input.value = val === "public" ? "1" : "0";
-        $$("[data-vis]", m).forEach(function (b) {
-          var pub = b.getAttribute("data-vis") === "public";
-          b.classList.toggle("on-public", pub && val === "public");
-          b.classList.toggle("on-private", !pub && val === "private");
-        });
-        var hint = $(".share-vishint", m);
-        if (hint) hint.textContent = val === "public" ? "피드에 공개되어 동료가 볼 수 있어요" : "나만 볼 수 있어요 · 언제든 공유로 전환 가능";
-      }
-    });
-  }
-
-  /* ---------------- 검색 / 정렬 / 필터 (클라이언트, 피드 대상) ---------------- */
-  function applyFeed() {
-    var grid = $("#feedGrid"); if (!grid) return;
-    var q = ($("#feedSearch") && $("#feedSearch").value || "").trim().toLowerCase();
-    var starOnly = $("#feedStarFilter") && $("#feedStarFilter").classList.contains("on");
-    var cards = $$(".fcard", grid);
-    var visible = 0;
-    cards.forEach(function (c) {
-      var hit = !q || (c.getAttribute("data-search") || "").indexOf(q) >= 0;
-      var st = !starOnly || c.getAttribute("data-starred") === "true";
-      var show = hit && st;
-      c.style.display = show ? "" : "none";
-      if (show) visible++;
-    });
-    var empty = $("#feedEmpty");
-    if (empty) {
-      empty.hidden = visible !== 0;
-      empty.textContent = starOnly && visible === 0
-        ? "아직 즐겨찾기한 프로젝트가 없어요 · 카드의 ⭐ 버튼으로 추가하세요"
-        : "“" + ($("#feedSearch") && $("#feedSearch").value || "") + "” 와 일치하는 프로젝트가 없습니다.";
-    }
-  }
-  function sortFeed(mode) {
-    var grid = $("#feedGrid"); if (!grid) return;
-    var cards = $$(".fcard", grid);
-    cards.sort(function (a, b) {
-      if (mode === "popular") {
-        return (+b.getAttribute("data-pop") || 0) - (+a.getAttribute("data-pop") || 0)
-          || (b.getAttribute("data-created") || "").localeCompare(a.getAttribute("data-created") || "");
-      }
-      return (b.getAttribute("data-created") || "").localeCompare(a.getAttribute("data-created") || "");
-    });
-    cards.forEach(function (c) { grid.appendChild(c); });
-  }
-  function initFeedControls() {
-    var search = $("#feedSearch");
-    if (search) search.addEventListener("input", applyFeed);
-    var sl = $("#sortLatest"), sp = $("#sortPopular");
-    if (sl) sl.addEventListener("click", function () { sl.classList.add("on"); if (sp) sp.classList.remove("on"); sortFeed("latest"); });
-    if (sp) sp.addEventListener("click", function () { sp.classList.add("on"); if (sl) sl.classList.remove("on"); sortFeed("popular"); });
-    var sf = $("#feedStarFilter");
-    if (sf) sf.addEventListener("click", function () { sf.classList.toggle("on"); applyFeed(); });
-  }
-
-  /* ---------------- 내 프로젝트 필터 (전체/공개/비공개) ---------------- */
-  function initMyFilter() {
-    var tabs = $$("[data-myfilter]");
-    if (!tabs.length) return;
-    tabs.forEach(function (tab) {
-      tab.addEventListener("click", function () {
-        var f = tab.getAttribute("data-myfilter"); // all | public | private
-        tabs.forEach(function (t) { t.classList.toggle("on", t === tab); });
-        $$("#myProjGrid .pcard").forEach(function (c) {
-          var vis = c.getAttribute("data-vis");
-          c.style.display = (f === "all" || vis === f) ? "" : "none";
-        });
-        var add = $("#addCard");
-        if (add) add.style.display = f === "all" ? "" : "none";
-      });
-    });
-  }
-
-  /* ---------------- 시작 신호 처리 (서버가 body 속성으로 전달) ---------------- */
-  function initSignals() {
-    var b = document.body;
-    if (b.getAttribute("data-toast")) toast(b.getAttribute("data-toast"));
-    var egg = b.getAttribute("data-egg");
-    if (egg === "lgtm") { burstThumbs(); toast("LGTM 👍 — Looks Good To Me!"); }
-    else if (egg === "rocket") burstRocket();
-    var open = b.getAttribute("data-open-modal");
-    if (open) openDetail(open);
-  }
-
-  /* ---------------- 콘솔 이스터에그 ---------------- */
-  function consoleArt() {
-    if (!EGGS_ON) return;
-    try {
-      var art = ["   ___    ____   ____  _______    __", "  /   |  /  _/  / __ \\/ ____/ |  / /", " / /| |  / /   / / / / __/  | | / / ", "/ ___ |_/ /   / /_/ / /___  | |/ /  ", "/_/  |_/___/  /_____/_____/  |___/   "].join("\n");
-      console.log("%c" + art, "color:#0969da;font-family:monospace;font-size:11px;line-height:1.1");
-      console.log("%c👀 코드 구경 왔어요? 환영합니다.", "color:#1f883d;font-size:13px;font-weight:bold");
-      console.log("%c사내 개발팀은 늘 동료를 찾고 있어요 — git blame 하지 말고 git praise 합시다. 🙇", "color:#656d76;font-size:12px");
-      console.log("%cps. 댓글에 LGTM 한 번 쳐보세요.", "color:#8b949e;font-size:11px");
-    } catch (e) {}
-  }
-
-  document.addEventListener("DOMContentLoaded", function () {
-    initTheme();
-    initUserMenu();
-    initLogoEgg();
-    initReactions();
-    initDetailModal();
-    initComments();
-    initShare();
-    initFeedControls();
-    initMyFilter();
-    initSignals();
-    consoleArt();
-  });
-})();
diff --git a/public/js/comments.js b/public/js/comments.js
new file mode 100644
index 0000000..e0c7592
--- /dev/null
+++ b/public/js/comments.js
@@ -0,0 +1,43 @@
+// 댓글 — 답글 타깃 설정 · Enter 등록 · 삭제 확인. (모달/단독 페이지 공용)
+import { $ } from "./util.js";
+
+export function initComments() {
+  document.addEventListener("click", (e) => {
+    const rb = e.target.closest("[data-reply-to]");
+    if (rb) {
+      e.preventDefault();
+      const scope = rb.closest(".modal") || document;
+      const parentInput = $('input[name="parent_id"]', scope);
+      const banner = $(".reply-banner", scope);
+      const ta = $(".comment-input", scope);
+      if (parentInput) parentInput.value = rb.getAttribute("data-reply-to");
+      if (banner) {
+        banner.hidden = false;
+        const who = $(".reply-banner-name", banner);
+        if (who) who.textContent = rb.getAttribute("data-reply-name") || "";
+      }
+      if (ta) { ta.placeholder = "답글을 입력하세요…"; ta.focus(); }
+      return;
+    }
+    if (e.target.closest("[data-cancel-reply]")) {
+      e.preventDefault();
+      const scope = e.target.closest(".modal") || document;
+      const pi = $('input[name="parent_id"]', scope); if (pi) pi.value = "";
+      const bn = $(".reply-banner", scope); if (bn) bn.hidden = true;
+      const ta = $(".comment-input", scope); if (ta) ta.placeholder = "댓글을 입력하세요…";
+      return;
+    }
+    const del = e.target.closest("[data-confirm]");
+    if (del && !window.confirm(del.getAttribute("data-confirm"))) e.preventDefault();
+  });
+
+  // Enter 등록 / Shift+Enter 줄바꿈
+  document.addEventListener("keydown", (e) => {
+    const ta = e.target;
+    if (ta && ta.classList && ta.classList.contains("comment-input") && e.key === "Enter" && !e.shiftKey) {
+      e.preventDefault();
+      const form = ta.closest("form");
+      if (form && ta.value.trim()) form.submit();
+    }
+  });
+}
diff --git a/public/js/feed.js b/public/js/feed.js
new file mode 100644
index 0000000..cc09236
--- /dev/null
+++ b/public/js/feed.js
@@ -0,0 +1,63 @@
+// 피드 검색·정렬·즐겨찾기 필터 + 내 프로젝트 필터 (모두 클라이언트 처리).
+import { $, $$ } from "./util.js";
+
+function applyFeed() {
+  const grid = $("#feedGrid"); if (!grid) return;
+  const q = (($("#feedSearch") && $("#feedSearch").value) || "").trim().toLowerCase();
+  const starOnly = $("#feedStarFilter") && $("#feedStarFilter").classList.contains("on");
+  let visible = 0;
+  $$(".fcard", grid).forEach((c) => {
+    const hit = !q || (c.getAttribute("data-search") || "").indexOf(q) >= 0;
+    const st = !starOnly || c.getAttribute("data-starred") === "true";
+    const show = hit && st;
+    c.style.display = show ? "" : "none";
+    if (show) visible++;
+  });
+  const empty = $("#feedEmpty");
+  if (empty) {
+    empty.hidden = visible !== 0;
+    empty.textContent = starOnly && visible === 0
+      ? "아직 즐겨찾기한 프로젝트가 없어요 · 카드의 ⭐ 버튼으로 추가하세요"
+      : "“" + (($("#feedSearch") && $("#feedSearch").value) || "") + "” 와 일치하는 프로젝트가 없습니다.";
+  }
+}
+
+function sortFeed(mode) {
+  const grid = $("#feedGrid"); if (!grid) return;
+  const cards = $$(".fcard", grid);
+  cards.sort((a, b) => {
+    if (mode === "popular") {
+      return (+b.getAttribute("data-pop") || 0) - (+a.getAttribute("data-pop") || 0)
+        || (b.getAttribute("data-created") || "").localeCompare(a.getAttribute("data-created") || "");
+    }
+    return (b.getAttribute("data-created") || "").localeCompare(a.getAttribute("data-created") || "");
+  });
+  cards.forEach((c) => grid.appendChild(c));
+}
+
+export function initFeed() {
+  const search = $("#feedSearch");
+  if (search) search.addEventListener("input", applyFeed);
+  const sl = $("#sortLatest"), sp = $("#sortPopular");
+  if (sl) sl.addEventListener("click", () => { sl.classList.add("on"); if (sp) sp.classList.remove("on"); sortFeed("latest"); });
+  if (sp) sp.addEventListener("click", () => { sp.classList.add("on"); if (sl) sl.classList.remove("on"); sortFeed("popular"); });
+  const sf = $("#feedStarFilter");
+  if (sf) sf.addEventListener("click", () => { sf.classList.toggle("on"); applyFeed(); });
+}
+
+export function initMyFilter() {
+  const tabs = $$("[data-myfilter]");
+  if (!tabs.length) return;
+  tabs.forEach((tab) => {
+    tab.addEventListener("click", () => {
+      const f = tab.getAttribute("data-myfilter"); // all | public | private
+      tabs.forEach((t) => t.classList.toggle("on", t === tab));
+      $$("#myProjGrid .pcard").forEach((c) => {
+        const vis = c.getAttribute("data-vis");
+        c.style.display = (f === "all" || vis === f) ? "" : "none";
+      });
+      const add = $("#addCard");
+      if (add) add.style.display = f === "all" ? "" : "none";
+    });
+  });
+}
diff --git a/public/js/main.js b/public/js/main.js
new file mode 100644
index 0000000..6e2ef3b
--- /dev/null
+++ b/public/js/main.js
@@ -0,0 +1,46 @@
+// 엔트리 — 각 모듈 초기화 + 서버 시작 신호(토스트/이스터에그/모달 열기) 처리.
+// _header/dashboard/project 에서 <script type="module" src="/public/js/main.js"> 로 로드.
+import { EGGS_ON, toast, burstThumbs, burstRocket } from "./util.js";
+import { initTheme, initUserMenu, initLogoEgg } from "./ui.js";
+import { initReactions } from "./reactions.js";
+import { initModals, openDetail } from "./modals.js";
+import { initComments } from "./comments.js";
+import { initFeed, initMyFilter } from "./feed.js";
+
+// 서버가 <body data-*> 로 전달한 1회성 신호 처리
+function initSignals() {
+  const b = document.body;
+  if (b.getAttribute("data-toast")) toast(b.getAttribute("data-toast"));
+  const egg = b.getAttribute("data-egg");
+  if (egg === "lgtm") { burstThumbs(); toast("LGTM 👍 — Looks Good To Me!"); }
+  else if (egg === "rocket") burstRocket();
+  const open = b.getAttribute("data-open-modal");
+  if (open) openDetail(open);
+}
+
+function consoleArt() {
+  if (!EGGS_ON) return;
+  try {
+    const art = ["   ___    ____   ____  _______    __", "  /   |  /  _/  / __ \\/ ____/ |  / /", " / /| |  / /   / / / / __/  | | / / ", "/ ___ |_/ /   / /_/ / /___  | |/ /  ", "/_/  |_/___/  /_____/_____/  |___/   "].join("\n");
+    console.log("%c" + art, "color:#0969da;font-family:monospace;font-size:11px;line-height:1.1");
+    console.log("%c👀 코드 구경 왔어요? 환영합니다.", "color:#1f883d;font-size:13px;font-weight:bold");
+    console.log("%c사내 개발팀은 늘 동료를 찾고 있어요 — git blame 하지 말고 git praise 합시다. 🙇", "color:#656d76;font-size:12px");
+    console.log("%cps. 댓글에 LGTM 한 번 쳐보세요.", "color:#8b949e;font-size:11px");
+  } catch (e) {}
+}
+
+function boot() {
+  initTheme();
+  initUserMenu();
+  initLogoEgg();
+  initReactions();
+  initModals();
+  initComments();
+  initFeed();
+  initMyFilter();
+  initSignals();
+  consoleArt();
+}
+
+if (document.readyState === "loading") document.addEventListener("DOMContentLoaded", boot);
+else boot();
diff --git a/public/js/modals.js b/public/js/modals.js
new file mode 100644
index 0000000..af6024a
--- /dev/null
+++ b/public/js/modals.js
@@ -0,0 +1,68 @@
+// 상세 모달 · 공유(등록) 모달 — 열기/닫기 및 공개범위 토글.
+import { $, $$ } from "./util.js";
+
+export function openDetail(id) {
+  const tpl = $('#detailStore template[data-detail-id="' + id + '"]');
+  const overlay = $("#detailModal");
+  if (!tpl || !overlay) { window.location.href = "/projects/" + id; return; }
+  const mount = $(".modal", overlay) || overlay;
+  mount.innerHTML = tpl.innerHTML;
+  overlay.hidden = false;
+  document.body.style.overflow = "hidden";
+  overlay.setAttribute("data-open-id", id);
+  const ta = $(".comment-input", overlay);
+  if (ta) ta.focus();
+}
+function closeDetail() {
+  const overlay = $("#detailModal");
+  if (!overlay || overlay.hidden) return;
+  overlay.hidden = true;
+  overlay.removeAttribute("data-open-id");
+  document.body.style.overflow = "";
+}
+
+function openShare() {
+  const m = $("#shareModal"); if (!m) return;
+  m.hidden = false; document.body.style.overflow = "hidden";
+  const t = $('input[name="title"]', m); if (t) t.focus();
+}
+function closeShare() {
+  const m = $("#shareModal"); if (!m || m.hidden) return;
+  m.hidden = true; document.body.style.overflow = "";
+}
+
+export function initModals() {
+  document.addEventListener("click", (e) => {
+    // 상세 모달 열기 (카드 클릭 — 반응 버튼/링크/data-stop 은 제외)
+    const opener = e.target.closest("[data-open-id]");
+    if (opener && !e.target.closest("[data-react]") && !e.target.closest("a") && !e.target.closest("[data-stop]")) {
+      e.preventDefault();
+      openDetail(opener.getAttribute("data-open-id"));
+      return;
+    }
+    if (e.target.closest("[data-close-detail]")) { e.preventDefault(); closeDetail(); return; }
+    if (e.target.closest("[data-open-share]")) { e.preventDefault(); openShare(); return; }
+    if (e.target.closest("[data-close-share]")) { e.preventDefault(); closeShare(); return; }
+
+    const detail = $("#detailModal");
+    if (detail && !detail.hidden && e.target === detail) { closeDetail(); return; }
+    const share = $("#shareModal");
+    if (share && !share.hidden && e.target === share) { closeShare(); return; }
+
+    // 공유 모달 공개/비공개 토글
+    const vo = e.target.closest("[data-vis]");
+    if (vo && share) {
+      const val = vo.getAttribute("data-vis");
+      const input = $('input[name="is_public"]', share);
+      if (input) input.value = val === "public" ? "1" : "0";
+      $$("[data-vis]", share).forEach((b) => {
+        const pub = b.getAttribute("data-vis") === "public";
+        b.classList.toggle("on-public", pub && val === "public");
+        b.classList.toggle("on-private", !pub && val === "private");
+      });
+      const hint = $(".share-vishint", share);
+      if (hint) hint.textContent = val === "public" ? "피드에 공개되어 동료가 볼 수 있어요" : "나만 볼 수 있어요 · 언제든 공유로 전환 가능";
+    }
+  });
+  document.addEventListener("keydown", (e) => { if (e.key === "Escape") { closeDetail(); closeShare(); } });
+}
diff --git a/public/js/reactions.js b/public/js/reactions.js
new file mode 100644
index 0000000..52c0af2
--- /dev/null
+++ b/public/js/reactions.js
@@ -0,0 +1,35 @@
+// ❤️ 좋아요 / ⭐ 즐겨찾기 — fetch 로 토글하고 카운트를 즉시 반영(점진적 향상).
+import { $, $$, toast, burstSparkle } from "./util.js";
+
+let starTaps = [];
+
+function syncReaction(id, kind, on, count) {
+  $$('[data-react][data-id="' + id + '"][data-kind="' + kind + '"]').forEach((b) => {
+    b.classList.toggle("on", !!on);
+    const c = $(".count", b);
+    if (c) c.textContent = count;
+  });
+}
+
+export function initReactions() {
+  document.addEventListener("click", (e) => {
+    const btn = e.target.closest("[data-react]");
+    if (!btn) return;
+    e.preventDefault();
+    e.stopPropagation();
+    const id = btn.getAttribute("data-id");
+    const kind = btn.getAttribute("data-kind"); // heart | star
+    if (kind === "star") {
+      starTaps = starTaps.filter((t) => Date.now() - t < 1400);
+      starTaps.push(Date.now());
+      if (starTaps.length >= 4) burstSparkle(e.clientX, e.clientY);
+    }
+    fetch("/projects/" + id + "/" + kind, {
+      method: "POST",
+      headers: { "X-Requested-With": "fetch", "Accept": "application/json" },
+    })
+      .then((r) => (r.ok ? r.json() : Promise.reject(r.status)))
+      .then((data) => syncReaction(id, kind, data.on, data.count))
+      .catch(() => toast("처리에 실패했습니다. 다시 시도해 주세요."));
+  });
+}
diff --git a/public/js/ui.js b/public/js/ui.js
new file mode 100644
index 0000000..c956c1f
--- /dev/null
+++ b/public/js/ui.js
@@ -0,0 +1,59 @@
+// 헤더 UI — 테마 토글 · 사용자 메뉴 · 로고 이스터에그.
+import { $, toast, burstThumbs } from "./util.js";
+
+function applyTheme(t) { document.documentElement.setAttribute("data-aidev-theme", t); }
+
+export function initTheme() {
+  const btn = $("#themeToggle");
+  if (!btn) return;
+  btn.addEventListener("click", () => {
+    const cur = document.documentElement.getAttribute("data-aidev-theme") === "dark" ? "dark" : "light";
+    const next = cur === "dark" ? "light" : "dark";
+    applyTheme(next);
+    try { localStorage.setItem("aidev-theme", next); } catch (e) {}
+  });
+}
+
+export function initUserMenu() {
+  const btn = $("#userMenuBtn"), pop = $("#userMenuPop");
+  if (!btn || !pop) return;
+  btn.addEventListener("click", (e) => {
+    e.stopPropagation();
+    const open = pop.hidden;
+    pop.hidden = !open;
+    btn.setAttribute("aria-expanded", open ? "true" : "false");
+  });
+  document.addEventListener("click", (e) => {
+    if (!pop.hidden && !pop.contains(e.target) && !btn.contains(e.target)) {
+      pop.hidden = true; btn.setAttribute("aria-expanded", "false");
+    }
+  });
+}
+
+// 로고를 4번 빠르게 클릭하면 흔들림 + 👍 (단일 클릭은 잠시 뒤 홈 이동)
+export function initLogoEgg() {
+  const logo = $("#brandLink");
+  if (!logo) return;
+  let clicks = 0, timer = null, navTimer = null;
+  const mark = $(".brand-mark", logo);
+  logo.addEventListener("click", (e) => {
+    e.preventDefault();
+    clicks++;
+    clearTimeout(timer);
+    timer = setTimeout(() => { clicks = 0; }, 700);
+    if (navTimer) clearTimeout(navTimer);
+    if (clicks >= 4) {
+      clicks = 0;
+      if (mark) {
+        mark.style.animation = "aidev-shake .5s ease";
+        const old = mark.style.filter;
+        mark.style.filter = "hue-rotate(180deg) saturate(1.5)";
+        setTimeout(() => { mark.style.animation = ""; mark.style.filter = old; }, 520);
+      }
+      burstThumbs();
+      toast('🌈 git commit -m "found an easter egg"');
+      return;
+    }
+    navTimer = setTimeout(() => { window.location.href = logo.getAttribute("href") || "/"; }, 320);
+  });
+}
diff --git a/public/js/util.js b/public/js/util.js
new file mode 100644
index 0000000..8360f98
--- /dev/null
+++ b/public/js/util.js
@@ -0,0 +1,68 @@
+// 공용 DOM 헬퍼 · 토스트 · 이스터에그(이모지 날리기). 다른 모듈이 import 해서 쓴다.
+export const $ = (s, r) => (r || document).querySelector(s);
+export const $$ = (s, r) => Array.prototype.slice.call((r || document).querySelectorAll(s));
+export const EGGS_ON = true;
+
+const CHECK_SVG =
+  '<svg width="14" height="14" viewBox="0 0 16 16" fill="#3fb950" aria-hidden="true"><path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L1.72 8.78a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"/></svg>';
+
+let toastTimer = null;
+export function toast(msg) {
+  if (!msg) return;
+  const old = $(".toast"); if (old) old.remove();
+  const t = document.createElement("div");
+  t.className = "toast";
+  t.innerHTML = '<span class="toast-ico">' + CHECK_SVG + "</span>";
+  t.appendChild(document.createTextNode(msg));
+  document.body.appendChild(t);
+  if (toastTimer) clearTimeout(toastTimer);
+  toastTimer = setTimeout(() => { if (t.parentNode) t.remove(); }, 2700);
+}
+
+let flyId = 0;
+function flyLayer() {
+  let l = $(".flyers");
+  if (!l) { l = document.createElement("div"); l.className = "flyers"; document.body.appendChild(l); }
+  return l;
+}
+function addFlyer(content, style, ttl) {
+  const span = document.createElement("span");
+  span.className = "flyer"; span.textContent = content;
+  Object.keys(style).forEach((k) => { span.style[k] = style[k]; });
+  flyLayer().appendChild(span);
+  span._id = ++flyId;
+  setTimeout(() => { if (span.parentNode) span.remove(); }, ttl);
+}
+
+export function burstThumbs() {
+  if (!EGGS_ON) return;
+  const cx = window.innerWidth / 2;
+  for (let i = 0; i < 6; i++) {
+    const dx = (Math.random() - 0.5) * 180;
+    addFlyer("👍", {
+      left: (cx + dx) + "px", top: (window.innerHeight * 0.62) + "px",
+      fontSize: (22 + Math.random() * 14) + "px",
+      animation: "aidev-flyup " + (0.9 + Math.random() * 0.3) + "s ease-out " + (i * 60) + "ms forwards",
+      opacity: 0,
+    }, 1500);
+  }
+}
+export function burstRocket() {
+  if (!EGGS_ON) return;
+  addFlyer("🚀", {
+    left: "-40px", top: (window.innerHeight * (0.18 + Math.random() * 0.2)) + "px",
+    fontSize: "34px", animation: "aidev-rocket 1.1s ease-in forwards",
+  }, 1300);
+}
+export function burstSparkle(x, y) {
+  if (!EGGS_ON) return;
+  const chars = ["✨", "⭐", "💫"];
+  for (let i = 0; i < 7; i++) {
+    const dx = (Math.random() - 0.5) * 90, dy = (Math.random() - 0.5) * 90;
+    addFlyer(chars[i % 3], {
+      left: (x + dx) + "px", top: (y + dy) + "px",
+      fontSize: (12 + Math.random() * 12) + "px",
+      animation: "aidev-sparkle " + (0.5 + Math.random() * 0.3) + "s ease-out forwards",
+    }, 900);
+  }
+}
diff --git a/views/dashboard.ejs b/views/dashboard.ejs
index 2ac30f6..02090a6 100644
--- a/views/dashboard.ejs
+++ b/views/dashboard.ejs
@@ -241,6 +241,6 @@
   </div>
 </div>
 
-<script src="/public/app.js"></script>
+<script type="module" src="/public/js/main.js"></script>
 </body>
 </html>
diff --git a/views/project.ejs b/views/project.ejs
index 6be7fdf..201601f 100644
--- a/views/project.ejs
+++ b/views/project.ejs
@@ -6,6 +6,6 @@
     </div>
   </div>
 </main>
-<script src="/public/app.js"></script>
+<script type="module" src="/public/js/main.js"></script>
 </body>
 </html>