diff --git a/public/css/components.css b/public/css/components.css
index 9348147..32e65aa 100644
--- a/public/css/components.css
+++ b/public/css/components.css
@@ -71,8 +71,11 @@
 }
 .vis-badge.public { color: var(--success-fg); background: var(--success-bg); border: 1px solid var(--success-bd); }
 .vis-badge.private { color: var(--fg2); background: var(--panel); border: 1px solid var(--border); }
-.toggle-share-btn { background: transparent; border: 0; padding: 0; cursor: pointer; font-family: inherit; font-size: 11.5px; font-weight: 600; color: var(--fg3); white-space: nowrap; }
-.toggle-share-btn:hover { color: var(--fg); }
+.toggle-share-btn {
+  display: inline-flex; align-items: center; gap: 5px; background: var(--btn-bg); border: 1px solid var(--btn-bd); border-radius: 7px; padding: 4px 10px;
+  cursor: pointer; font-family: inherit; font-size: 11.5px; font-weight: 600; color: var(--fg2); white-space: nowrap; transition: background .14s ease, color .14s ease, border-color .14s ease;
+}
+.toggle-share-btn:hover { background: var(--btn-hover); color: var(--fg); border-color: var(--border); }
 .private-note { font-size: 11.5px; color: var(--fg3); }
 .share-mini-btn {
   display: inline-flex; align-items: center; gap: 5px; background: var(--success);
diff --git a/src/server.js b/src/server.js
index ff1a673..be83bd3 100644
--- a/src/server.js
+++ b/src/server.js
@@ -155,7 +155,10 @@ app.post("/projects/:id/visibility", requireAuth, async (req, res) => {
   const isPublic = req.body.is_public === "1";
   await db.setVisibility({ id: req.params.id, sabun: req.session.user.sabun, isPublic });
   const msg = isPublic ? "공개로 전환됐습니다 · 피드에 표시됩니다" : "비공개로 전환됐습니다";
-  res.redirect("/?toast=" + encodeURIComponent(msg));
+  // 모달에서 전환하면 return_to(=/?open=<id>) 로 돌아가 모달을 다시 연다. 카드에서는 "/".
+  const back = safeBack(req.body.return_to, "/");
+  const sep = back.includes("?") ? "&" : "?";
+  res.redirect(back + sep + "toast=" + encodeURIComponent(msg));
 });
 
 // --- 프로젝트 삭제 (본인) ---
diff --git a/views/_project_detail.ejs b/views/_project_detail.ejs
index 2e659e5..8572d45 100644
--- a/views/_project_detail.ejs
+++ b/views/_project_detail.ejs
@@ -55,7 +55,12 @@
       <a class="modal-action ghost" href="<%= p.repo_url %>" target="_blank" rel="noopener"><%- icon("code", { size: 14 }) %>저장소</a>
     <% } %>
     <% if (p.owner_sabun === me) { %>
-      <form method="post" action="/projects/<%= p.id %>/delete" style="margin-left:auto">
+      <form method="post" action="/projects/<%= p.id %>/visibility" style="margin-left:auto">
+        <input type="hidden" name="is_public" value="<%= p.is_public ? "0" : "1" %>" />
+        <input type="hidden" name="return_to" value="<%= returnTo %>" />
+        <button type="submit" class="modal-action"><%- icon(p.is_public ? "lock" : "globe", { size: 14 }) %><%= p.is_public ? "비공개로 전환" : "공개로 전환" %></button>
+      </form>
+      <form method="post" action="/projects/<%= p.id %>/delete">
         <input type="hidden" name="return_to" value="/" />
         <button type="submit" class="comment-link comment-del" data-confirm="이 프로젝트를 삭제할까요? 댓글·반응도 함께 삭제됩니다." style="font-size:12.5px"><%- icon("trash", { size: 13 }) %>프로젝트 삭제</button>
       </form>