diff --git a/tools/extra-panels/mdm.js b/tools/extra-panels/mdm.js
index dc804e9f..80ee45e8 100644
--- a/tools/extra-panels/mdm.js
+++ b/tools/extra-panels/mdm.js
@@ -6876,7 +6876,7 @@ a{color:${v.accent}}
       return true;
     }
 
-    /** 点预览里的图片 → 小工具条改尺寸/对齐 */
+    /** 点预览里的图片 → 小工具条改尺寸/对齐（单击；双击放大见 bindPreviewImgLightbox） */
     function openImageTools(img) {
       const rel = img.getAttribute("data-mdm-asset") || "";
       const alt = img.getAttribute("alt") || "";
@@ -6926,6 +6926,198 @@ a{color:${v.accent}}
       }, 0);
     }
 
+    /**
+     * 双击预览图片 → 全屏放大（与单击尺寸条互不干扰）。
+     * lightbox 挂 body + html2canvas-ignore，不影响导出 PNG / 复制预览。
+     */
+    function bindPreviewImgLightbox() {
+      if (!els.preview || els.preview.dataset.mdmLightboxBound === "1") return;
+      els.preview.dataset.mdmLightboxBound = "1";
+
+      let dlg = document.getElementById("mdm-lightbox");
+      if (!dlg) {
+        dlg = document.createElement("dialog");
+        dlg.id = "mdm-lightbox";
+        dlg.className = "mdm-lightbox";
+        dlg.setAttribute("data-html2canvas-ignore", "true");
+        dlg.setAttribute("aria-label", "图片放大预览");
+        dlg.innerHTML =
+          `<div class="mdm-lightbox-inner" data-html2canvas-ignore="true">` +
+          `<div class="mdm-lightbox-head">` +
+          `<p class="hint tight mdm-lightbox-cap" id="mdm-lightbox-cap"></p>` +
+          `<button type="button" class="ghost-btn" id="mdm-lightbox-close" aria-label="关闭预览">关闭</button>` +
+          `</div>` +
+          `<div class="mdm-lightbox-stage" id="mdm-lightbox-stage">` +
+          `<img id="mdm-lightbox-img" class="mdm-lightbox-img" alt="" draggable="false" />` +
+          `</div>` +
+          `<div class="mdm-lightbox-toolbar">` +
+          `<button type="button" class="ghost-btn" id="mdm-lightbox-zoom-out" aria-label="缩小">－</button>` +
+          `<span class="mono" id="mdm-lightbox-zoom-pct">100%</span>` +
+          `<button type="button" class="ghost-btn" id="mdm-lightbox-zoom-in" aria-label="放大">＋</button>` +
+          `<button type="button" class="ghost-btn" id="mdm-lightbox-zoom-reset">还原</button>` +
+          `</div></div>`;
+        document.body.appendChild(dlg);
+      }
+
+      const stage = dlg.querySelector("#mdm-lightbox-stage");
+      const imgEl = dlg.querySelector("#mdm-lightbox-img");
+      const cap = dlg.querySelector("#mdm-lightbox-cap");
+      const pctEl = dlg.querySelector("#mdm-lightbox-zoom-pct");
+      const closeBtn = dlg.querySelector("#mdm-lightbox-close");
+      const zoomInBtn = dlg.querySelector("#mdm-lightbox-zoom-in");
+      const zoomOutBtn = dlg.querySelector("#mdm-lightbox-zoom-out");
+      const zoomResetBtn = dlg.querySelector("#mdm-lightbox-zoom-reset");
+      if (!stage || !imgEl) return;
+
+      const view = { scale: 1, x: 0, y: 0, dragging: false, lastX: 0, lastY: 0 };
+
+      function syncTransform() {
+        imgEl.style.transform = `translate(calc(-50% + ${view.x}px), calc(-50% + ${view.y}px)) scale(${view.scale})`;
+        if (pctEl) pctEl.textContent = `${Math.round(view.scale * 100)}%`;
+      }
+
+      function fitImage() {
+        const sw = stage.clientWidth || 1;
+        const sh = stage.clientHeight || 1;
+        const nw = imgEl.naturalWidth || 1;
+        const nh = imgEl.naturalHeight || 1;
+        view.scale = Math.min(1, sw / nw, sh / nh);
+        view.x = 0;
+        view.y = 0;
+        syncTransform();
+      }
+
+      function clampScale(next) {
+        return Math.min(8, Math.max(0.2, next));
+      }
+
+      function zoomAt(clientX, clientY, nextScale) {
+        const rect = stage.getBoundingClientRect();
+        const cx = clientX - rect.left - rect.width / 2;
+        const cy = clientY - rect.top - rect.height / 2;
+        const ratio = nextScale / view.scale;
+        view.x = cx - (cx - view.x) * ratio;
+        view.y = cy - (cy - view.y) * ratio;
+        view.scale = nextScale;
+        syncTransform();
+      }
+
+      function closePreview() {
+        try {
+          if (dlg.open) dlg.close();
+          else dlg.removeAttribute("open");
+        } catch (_) {
+          dlg.removeAttribute("open");
+        }
+        imgEl.removeAttribute("src");
+        imgEl.alt = "";
+        if (cap) cap.textContent = "";
+        view.scale = 1;
+        view.x = 0;
+        view.y = 0;
+        view.dragging = false;
+        syncTransform();
+      }
+
+      function openPreview(src, alt) {
+        if (!src) return;
+        // 关掉尺寸条，避免叠在 lightbox 上
+        document.querySelectorAll(".mdm-imgtools").forEach((n) => n.remove());
+        view.scale = 1;
+        view.x = 0;
+        view.y = 0;
+        view.dragging = false;
+        imgEl.onload = () => fitImage();
+        imgEl.onerror = () => {
+          toast("图片无法放大预览");
+          closePreview();
+        };
+        imgEl.src = src;
+        imgEl.alt = alt || "";
+        if (cap) cap.textContent = alt || "图片预览 · 滚轮缩放 · 拖拽平移";
+        try {
+          if (typeof dlg.showModal === "function") dlg.showModal();
+          else dlg.setAttribute("open", "");
+        } catch (_) {
+          dlg.setAttribute("open", "");
+        }
+        if (imgEl.complete && imgEl.naturalWidth) fitImage();
+      }
+
+      els.preview.addEventListener("dblclick", (e) => {
+        const img = e.target.closest?.("img");
+        if (!img || !els.preview.contains(img)) return;
+        // 缺图占位 / 无可用 src 不打开
+        if (img.classList.contains("mdm-img-missing")) return;
+        const src = img.currentSrc || img.src || "";
+        if (!src || src === window.location.href) return;
+        e.preventDefault();
+        e.stopPropagation();
+        openPreview(src, img.getAttribute("alt") || "");
+      });
+
+      closeBtn?.addEventListener("click", (e) => {
+        e.preventDefault();
+        closePreview();
+      });
+      dlg.addEventListener("click", (e) => {
+        if (e.target === dlg) closePreview();
+      });
+      dlg.addEventListener("cancel", (e) => {
+        e.preventDefault();
+        closePreview();
+      });
+
+      zoomInBtn?.addEventListener("click", () => {
+        const rect = stage.getBoundingClientRect();
+        zoomAt(rect.left + rect.width / 2, rect.top + rect.height / 2, clampScale(view.scale * 1.2));
+      });
+      zoomOutBtn?.addEventListener("click", () => {
+        const rect = stage.getBoundingClientRect();
+        zoomAt(rect.left + rect.width / 2, rect.top + rect.height / 2, clampScale(view.scale / 1.2));
+      });
+      zoomResetBtn?.addEventListener("click", fitImage);
+
+      stage.addEventListener(
+        "wheel",
+        (e) => {
+          if (!dlg.open) return;
+          e.preventDefault();
+          const factor = Math.exp(-e.deltaY * 0.0015);
+          zoomAt(e.clientX, e.clientY, clampScale(view.scale * factor));
+        },
+        { passive: false }
+      );
+
+      stage.addEventListener("pointerdown", (e) => {
+        if (e.button !== 0) return;
+        view.dragging = true;
+        view.lastX = e.clientX;
+        view.lastY = e.clientY;
+        stage.setPointerCapture?.(e.pointerId);
+      });
+      stage.addEventListener("pointermove", (e) => {
+        if (!view.dragging) return;
+        view.x += e.clientX - view.lastX;
+        view.y += e.clientY - view.lastY;
+        view.lastX = e.clientX;
+        view.lastY = e.clientY;
+        syncTransform();
+      });
+      const endDrag = () => {
+        view.dragging = false;
+      };
+      stage.addEventListener("pointerup", endDrag);
+      stage.addEventListener("pointercancel", endDrag);
+      stage.addEventListener("dblclick", (e) => {
+        e.preventDefault();
+        if (view.scale > 1.05) fitImage();
+        else zoomAt(e.clientX, e.clientY, clampScale(Math.max(view.scale * 1.8, 1.5)));
+      });
+    }
+
+    bindPreviewImgLightbox();
+
     /** 复制预览到剪贴板：HTML（带格式，媒体内联为 data URL）+ 纯文本（Markdown 源码） */
     async function copyPreviewToClipboard() {
       if (!els.preview) return;
diff --git a/tools/index.html b/tools/index.html
index d09bd937..4794a187 100644
--- a/tools/index.html
+++ b/tools/index.html
@@ -11,12 +11,12 @@
   <link rel="manifest" href="./manifest.webmanifest" />
   <title>DevTools · 本地实用小工具合集</title>
   <script>try{if(navigator.standalone||matchMedia('(display-mode: standalone)').matches)document.documentElement.classList.add('is-pwa-standalone')}catch(e){}</script>
-  <script src="./lib/tools-build.js?v=2026.10.23-111328"></script>
-  <link rel="stylesheet" href="./style.css?v=2026.10.23-111328" />
-  <link rel="stylesheet" href="./workspace-nav.css?v=2026.10.23-111328" />
-  <link rel="stylesheet" href="./styles/bridge-shell.css?v=2026.10.23-111328" />
-  <script src="./lib/theme-presets.js?v=2026.10.23-111328"></script>
-  <script src="./lib/boot-loader.js?v=2026.10.23-111328"></script>
+  <script src="./lib/tools-build.js?v=2026.10.23-114229"></script>
+  <link rel="stylesheet" href="./style.css?v=2026.10.23-114229" />
+  <link rel="stylesheet" href="./workspace-nav.css?v=2026.10.23-114229" />
+  <link rel="stylesheet" href="./styles/bridge-shell.css?v=2026.10.23-114229" />
+  <script src="./lib/theme-presets.js?v=2026.10.23-114229"></script>
+  <script src="./lib/boot-loader.js?v=2026.10.23-114229"></script>
   <script>
   (function(){try{var raw=String(location.hash||'').replace(/^#/,'').trim();var head=raw.split(/[/?]/)[0]||'';var last=localStorage.getItem('devtools-tool-last-v1');var id='timestamp';if(head&&head!=='timestamp')id=head;else if(last&&last!=='timestamp')id=last;document.documentElement.dataset.bootPanel=id;}catch(e){document.documentElement.dataset.bootPanel='timestamp'}})();
   </script>
@@ -26,7 +26,7 @@
     <div class="header-row">
       <div class="header-brand-block">
         <a class="brand" href="./"><span class="brand-mark"></span><span class="brand-name">DevTools</span></a>
-        <span class="tool-ver site-tools-ver mono" id="site-tools-version">v2026.10.23-111328</span>
+        <span class="tool-ver site-tools-ver mono" id="site-tools-version">v2026.10.23-114229</span>
       </div>
       <div class="header-actions">
         <button type="button" class="ghost-btn header-action-collapse" id="site-force-refresh">强制刷新</button>
@@ -287,16 +287,16 @@ <h2 class="dateremind-fs-heading">临近的重要日期</h2>
     <button type="button" class="ruler-fs-close ghost-btn" id="ruler-fs-close">退出全屏</button>
     <p class="ruler-fs-hud mono hint" id="ruler-coord-fs"></p>
   </div>
-  <script src="./lib/bridge-token.js?v=2026.10.23-111328"></script>
-  <script src="./lib/unified-bridge-bundle.js?v=2026.10.23-111328"></script>
-  <script src="./lib/bridge-shell.js?v=2026.10.23-111328"></script>
-  <script src="./lib/giscus-config.js?v=2026.10.23-111328"></script>
-  <script src="./lib/giscus.js?v=2026.10.23-111328"></script>
-  <script src="./lib/tool-registry.js?v=2026.10.23-111328"></script>
-  <script src="./lib/nav-scale.js?v=2026.10.23-111328"></script>
-  <script src="./lib/lazy-scripts.js?v=2026.10.23-111328"></script>
-  <script src="./lib/panel-loader.js?v=2026.10.23-111328"></script>
-  <script src="./theme.js?v=2026.10.23-111328"></script>
-  <script src="./app.js?v=2026.10.23-111328"></script>
+  <script src="./lib/bridge-token.js?v=2026.10.23-114229"></script>
+  <script src="./lib/unified-bridge-bundle.js?v=2026.10.23-114229"></script>
+  <script src="./lib/bridge-shell.js?v=2026.10.23-114229"></script>
+  <script src="./lib/giscus-config.js?v=2026.10.23-114229"></script>
+  <script src="./lib/giscus.js?v=2026.10.23-114229"></script>
+  <script src="./lib/tool-registry.js?v=2026.10.23-114229"></script>
+  <script src="./lib/nav-scale.js?v=2026.10.23-114229"></script>
+  <script src="./lib/lazy-scripts.js?v=2026.10.23-114229"></script>
+  <script src="./lib/panel-loader.js?v=2026.10.23-114229"></script>
+  <script src="./theme.js?v=2026.10.23-114229"></script>
+  <script src="./app.js?v=2026.10.23-114229"></script>
 </body>
 </html>
diff --git a/tools/lib/tools-build.js b/tools/lib/tools-build.js
index 06c61157..21213f9e 100644
--- a/tools/lib/tools-build.js
+++ b/tools/lib/tools-build.js
@@ -1,6 +1,6 @@
 (() => {
   "use strict";
-  const BUILD = "2026.10.23-111328";
+  const BUILD = "2026.10.23-114229";
   window.TOOLS_BUILD = BUILD;
   window.TOOLS_VERSION = BUILD;
 
diff --git a/tools/styles/panels/mdm.css b/tools/styles/panels/mdm.css
index dc8d4f7c..64ae770e 100644
--- a/tools/styles/panels/mdm.css
+++ b/tools/styles/panels/mdm.css
@@ -237,6 +237,77 @@
 .mdm-imgtools button:hover { color: var(--accent); border-color: var(--accent); }
 .mdm-imgtools-label { margin: 0 0.15rem 0 0.35rem; color: var(--muted); font-size: 0.72rem; }
 
+/* 预览双击图片放大（挂 body；不改单击尺寸条） */
+.mdm-lightbox {
+  border: 0;
+  padding: 0;
+  max-width: min(94vw, 1400px);
+  width: min(94vw, 1400px);
+  height: min(92vh, 960px);
+  max-height: min(92vh, 960px);
+  background: var(--panel-strong, var(--bg-0));
+  color: var(--ink);
+  border-radius: 14px;
+  box-shadow: 0 22px 64px rgba(0, 0, 0, 0.45);
+}
+.mdm-lightbox::backdrop {
+  background: color-mix(in srgb, var(--bg-0) 72%, transparent);
+}
+.mdm-lightbox-inner {
+  display: grid;
+  grid-template-rows: auto minmax(0, 1fr) auto;
+  gap: 0.55rem;
+  padding: 0.75rem;
+  height: 100%;
+  min-height: 0;
+  box-sizing: border-box;
+}
+.mdm-lightbox-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 0.75rem;
+}
+.mdm-lightbox-cap {
+  margin: 0;
+  flex: 1 1 auto;
+}
+.mdm-lightbox-stage {
+  position: relative;
+  overflow: hidden;
+  min-height: 0;
+  height: 100%;
+  border: 1px solid var(--line);
+  border-radius: 10px;
+  background: color-mix(in srgb, var(--ink) 4%, transparent);
+  touch-action: none;
+  cursor: grab;
+}
+.mdm-lightbox-stage:active { cursor: grabbing; }
+.mdm-lightbox-img {
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  max-width: none;
+  max-height: none;
+  width: auto;
+  height: auto;
+  transform: translate(-50%, -50%);
+  transform-origin: center center;
+  user-select: none;
+  -webkit-user-drag: none;
+}
+.mdm-lightbox-toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.45rem;
+  flex-wrap: wrap;
+}
+#mdm .markdown-body img:not(.mdm-img-missing) {
+  cursor: zoom-in;
+}
+
 /* 沉浸（全屏）：隐藏站点外壳，让工具铺满屏幕；只有编辑器 / 预览自己滚 */
 .mdm-max-btn { padding: 0.15rem 0.5rem; line-height: 1.2; }
 body.mdm-immersive .site-header,
diff --git a/tools/sw.js b/tools/sw.js
index f0a90230..84c4a10a 100644
--- a/tools/sw.js
+++ b/tools/sw.js
@@ -2,7 +2,7 @@
 /* eslint-disable no-restricted-globals */
 "use strict";
 
-const SHELL_CACHE = "devtools-shell-20261023-111328";
+const SHELL_CACHE = "devtools-shell-20261023-114229";
 const PRECACHE = [
   "./",
   "./index.html",