From 2db77fe663c74de3d6b4c4d1fc73173048bb9984 Mon Sep 17 00:00:00 2001
From: JOJO <1498581755@qq.com>
Date: Wed, 5 Aug 2026 01:03:03 +0800
Subject: [PATCH] =?UTF-8?q?feat(chat):=20show=5Fhtml=20=E5=8D=A1=E7=89=87?=
 =?UTF-8?q?=E5=B7=A5=E5=85=B7=E6=A0=8F=E6=94=B9=E4=B8=BA=20=E2=8B=AF=20?=
 =?UTF-8?q?=E8=8F=9C=E5=8D=95=E5=B9=B6=E6=96=B0=E5=A2=9E=E5=85=A8=E5=B1=8F?=
 =?UTF-8?q?=E9=A2=84=E8=A7=88?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 static/src/app/bootstrap.ts                   | 394 +++++++++++++++---
 .../styles/components/chat/_chat-area.scss    | 180 +++++++-
 2 files changed, 501 insertions(+), 73 deletions(-)

diff --git a/static/src/app/bootstrap.ts b/static/src/app/bootstrap.ts
index 9e228999..a37eeed3 100644
--- a/static/src/app/bootstrap.ts
+++ b/static/src/app/bootstrap.ts
@@ -505,42 +505,309 @@ function escapeHtml(input: string) {
     .replace(/'/g, '&#39;');
 }
 
-function bindShowHtmlRefreshControl(wrapper: HTMLElement, onRefresh: () => void) {
+/**
+ * show_html 卡片全屏预览载荷。
+ * - js="on" 卡片：直接复用已注入 CSP/守卫的 srcdoc，沙箱允许脚本
+ * - js="off" 卡片：用 sanitize 后的 HTML 现场构建 srcdoc，沙箱禁脚本（与卡片内语义一致）
+ */
+interface ShowHtmlFullscreenPayload {
+  srcdoc: string;
+  allowScripts: boolean;
+}
+
+interface ShowHtmlCardControls {
+  onRefresh: () => void;
+  getFullscreenPayload: () => ShowHtmlFullscreenPayload | null;
+}
+
+const SHOW_HTML_CONTROLS_KEY = '__showHtmlCardControls';
+
+function getShowHtmlCardControls(wrapper: HTMLElement): ShowHtmlCardControls | null {
+  return ((wrapper as any)[SHOW_HTML_CONTROLS_KEY] as ShowHtmlCardControls | undefined) || null;
+}
+
+function triggerShowHtmlCardRefresh(wrapper: HTMLElement, btn: HTMLElement | null) {
+  const controls = getShowHtmlCardControls(wrapper);
+  if (!controls) return;
+  markShowTagDrawingActive(1200);
+  if (btn) {
+    btn.classList.remove('is-refreshing');
+    // 触发重放动画
+    void btn.offsetWidth;
+    btn.classList.add('is-refreshing');
+    window.setTimeout(() => btn.classList.remove('is-refreshing'), 720);
+  }
+  try {
+    controls.onRefresh();
+  } catch (error) {
+    debugShowHtmlLog('refresh:error', {
+      message: error instanceof Error ? error.message : String(error || '')
+    });
+  }
+}
+
+// ===== 卡片 ⋯ 菜单（全局 fixed 单例，同一时间只存在一个） =====
+let showHtmlCardMenuEl: HTMLElement | null = null;
+let showHtmlCardMenuAnchor: HTMLElement | null = null;
+let showHtmlCardMenuEventsBound = false;
+
+function closeShowHtmlCardMenu() {
+  if (showHtmlCardMenuEl) {
+    showHtmlCardMenuEl.remove();
+    showHtmlCardMenuEl = null;
+    showHtmlCardMenuAnchor = null;
+  }
+}
+
+function bindShowHtmlCardMenuGlobalEvents() {
+  if (showHtmlCardMenuEventsBound || typeof document === 'undefined') return;
+  showHtmlCardMenuEventsBound = true;
+  document.addEventListener(
+    'click',
+    (event) => {
+      if (!showHtmlCardMenuEl) return;
+      const target = event.target as Node | null;
+      if (target && showHtmlCardMenuEl.contains(target)) return;
+      // 锚点按钮自身走 toggle 逻辑，不在全局监听里关闭
+      if (target && showHtmlCardMenuAnchor?.contains(target)) return;
+      closeShowHtmlCardMenu();
+    },
+    true
+  );
+  document.addEventListener(
+    'keydown',
+    (event) => {
+      if (event.key === 'Escape' && showHtmlCardMenuEl) {
+        event.stopPropagation();
+        closeShowHtmlCardMenu();
+      }
+    },
+    true
+  );
+  window.addEventListener('resize', closeShowHtmlCardMenu);
+  // 聊天区滚动时菜单位置即失效，直接关闭（capture 以捕获任意滚动容器）
+  document.addEventListener(
+    'scroll',
+    () => {
+      if (showHtmlCardMenuEl) closeShowHtmlCardMenu();
+    },
+    true
+  );
+}
+
+function buildShowHtmlCardMenuItem(label: string): HTMLButtonElement {
+  const item = document.createElement('button');
+  item.type = 'button';
+  item.className = 'show-html-card-menu__item';
+  item.textContent = label;
+  return item;
+}
+
+function openShowHtmlCardMenu(anchor: HTMLElement, wrapper: HTMLElement) {
+  bindShowHtmlCardMenuGlobalEvents();
+  if (showHtmlCardMenuEl && showHtmlCardMenuAnchor === anchor) {
+    closeShowHtmlCardMenu();
+    return;
+  }
+  closeShowHtmlCardMenu();
+
+  const menu = document.createElement('div');
+  menu.className = 'show-html-card-menu';
+  menu.setAttribute('role', 'menu');
+
+  const refreshItem = buildShowHtmlCardMenuItem('刷新');
+  refreshItem.onclick = (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    closeShowHtmlCardMenu();
+    triggerShowHtmlCardRefresh(wrapper, anchor);
+  };
+
+  const fullscreenItem = buildShowHtmlCardMenuItem('全屏');
+  fullscreenItem.onclick = (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    const controls = getShowHtmlCardControls(wrapper);
+    closeShowHtmlCardMenu();
+    const payload = controls?.getFullscreenPayload?.();
+    if (!payload || !payload.srcdoc) return;
+    openShowHtmlFullscreen(payload);
+  };
+
+  menu.appendChild(refreshItem);
+  menu.appendChild(fullscreenItem);
+  document.body.appendChild(menu);
+
+  // 定位：按钮下方、右对齐，视口边缘留 8px 安全距离
+  const rect = anchor.getBoundingClientRect();
+  const menuWidth = menu.offsetWidth;
+  let left = Math.round(rect.right - menuWidth);
+  left = Math.max(8, Math.min(left, window.innerWidth - menuWidth - 8));
+  menu.style.left = `${left}px`;
+  menu.style.top = `${Math.round(rect.bottom + 6)}px`;
+
+  showHtmlCardMenuEl = menu;
+  showHtmlCardMenuAnchor = anchor;
+}
+
+// ===== show_html 全屏预览（应用内 overlay，复用沙箱 srcdoc，不走路由） =====
+interface ShowHtmlFullscreenState {
+  root: HTMLElement;
+  iframe: HTMLIFrameElement;
+  payload: ShowHtmlFullscreenPayload | null;
+}
+
+const SHOW_HTML_FULLSCREEN_EMPTY_SRCDOC =
+  '<!doctype html><html><head><meta charset="utf-8"></head><body></body></html>';
+
+let showHtmlFullscreenState: ShowHtmlFullscreenState | null = null;
+let showHtmlFullscreenEventsBound = false;
+
+function isShowHtmlFullscreenOpen(): boolean {
+  return !!showHtmlFullscreenState?.root.classList.contains('is-open');
+}
+
+function bindShowHtmlFullscreenGlobalEvents() {
+  if (showHtmlFullscreenEventsBound || typeof document === 'undefined') return;
+  showHtmlFullscreenEventsBound = true;
+  // 桌面端 Esc 退出；移动端没有 Esc，依赖顶栏 ✕ 按钮（触屏主路径）
+  document.addEventListener('keydown', (event) => {
+    if (event.key !== 'Escape' || !isShowHtmlFullscreenOpen()) return;
+    event.stopPropagation();
+    closeShowHtmlFullscreen();
+  });
+}
+
+function ensureShowHtmlFullscreenDom(): ShowHtmlFullscreenState {
+  if (showHtmlFullscreenState) return showHtmlFullscreenState;
+  bindShowHtmlFullscreenGlobalEvents();
+
+  const root = document.createElement('div');
+  root.className = 'show-html-fullscreen';
+  root.setAttribute('role', 'dialog');
+  root.setAttribute('aria-modal', 'true');
+  root.setAttribute('aria-label', '卡片全屏预览');
+
+  const bar = document.createElement('div');
+  bar.className = 'show-html-fullscreen__bar';
+  const title = document.createElement('span');
+  title.className = 'show-html-fullscreen__title';
+  title.textContent = '全屏预览';
+  const actions = document.createElement('div');
+  actions.className = 'show-html-fullscreen__actions';
+
+  const refreshBtn = document.createElement('button');
+  refreshBtn.type = 'button';
+  refreshBtn.className = 'show-html-fullscreen__btn';
+  refreshBtn.title = '刷新';
+  refreshBtn.setAttribute('aria-label', '刷新');
+  refreshBtn.textContent = '↻';
+
+  const closeBtn = document.createElement('button');
+  closeBtn.type = 'button';
+  closeBtn.className = 'show-html-fullscreen__btn show-html-fullscreen__btn--close';
+  closeBtn.title = '关闭（Esc）';
+  closeBtn.setAttribute('aria-label', '关闭全屏预览');
+  closeBtn.textContent = '✕';
+
+  actions.appendChild(refreshBtn);
+  actions.appendChild(closeBtn);
+  bar.appendChild(title);
+  bar.appendChild(actions);
+
+  const body = document.createElement('div');
+  body.className = 'show-html-fullscreen__body';
+  const iframe = document.createElement('iframe');
+  iframe.className = 'show-html-fullscreen__iframe';
+  iframe.setAttribute('referrerpolicy', 'no-referrer');
+  // 与内联卡片一致：overlay 用 CSS fixed 占满视口，不需要浏览器 Fullscreen API
+  iframe.setAttribute('allow', "fullscreen 'none'");
+  body.appendChild(iframe);
+
+  root.appendChild(bar);
+  root.appendChild(body);
+
+  refreshBtn.onclick = (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    const state = showHtmlFullscreenState;
+    if (!state?.payload) return;
+    // 与内联卡片刷新同策略：先挂空文档再重挂，强制 iframe 内页面重载
+    const keep = state.payload.srcdoc;
+    state.iframe.srcdoc = SHOW_HTML_FULLSCREEN_EMPTY_SRCDOC;
+    requestAnimationFrame(() => {
+      if (showHtmlFullscreenState?.payload) {
+        showHtmlFullscreenState.iframe.srcdoc = keep;
+      }
+    });
+    debugShowHtmlLog('fullscreen:refresh', { srcdocLength: keep.length });
+  };
+  closeBtn.onclick = (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    closeShowHtmlFullscreen();
+  };
+
+  document.body.appendChild(root);
+  showHtmlFullscreenState = { root, iframe, payload: null };
+  return showHtmlFullscreenState;
+}
+
+function openShowHtmlFullscreen(payload: ShowHtmlFullscreenPayload) {
+  if (typeof document === 'undefined') return;
+  const state = ensureShowHtmlFullscreenDom();
+  state.payload = payload;
+  // js=off 卡片内容已 sanitize，全屏时连脚本执行权也不给，语义与卡片内一致
+  state.iframe.setAttribute('sandbox', payload.allowScripts ? 'allow-scripts' : '');
+  state.iframe.srcdoc = payload.srcdoc;
+  state.root.classList.add('is-open');
+  document.documentElement.classList.add('show-html-fullscreen-open');
+  debugShowHtmlLog('fullscreen:open', {
+    allowScripts: payload.allowScripts,
+    srcdocLength: payload.srcdoc.length
+  });
+}
+
+function closeShowHtmlFullscreen() {
+  const state = showHtmlFullscreenState;
+  if (!state || !isShowHtmlFullscreenOpen()) return;
+  state.root.classList.remove('is-open');
+  document.documentElement.classList.remove('show-html-fullscreen-open');
+  state.payload = null;
+  // 清空 srcdoc：停掉 iframe 内脚本/定时器并释放内存
+  state.iframe.srcdoc = SHOW_HTML_FULLSCREEN_EMPTY_SRCDOC;
+  debugShowHtmlLog('fullscreen:close', {});
+}
+
+/**
+ * 绑定 show_html 卡片右上角工具栏（⋯ 菜单：刷新 / 全屏）。
+ * 渲染器每次重渲染都会调用：最新回调挂在 wrapper 上，按钮与菜单只创建一次。
+ */
+function bindShowHtmlCardControls(wrapper: HTMLElement, controls: ShowHtmlCardControls) {
+  (wrapper as any)[SHOW_HTML_CONTROLS_KEY] = controls;
   let toolbar = wrapper.querySelector(':scope > .chat-inline-card__toolbar') as HTMLElement | null;
   if (!toolbar) {
     toolbar = document.createElement('div');
     toolbar.className = 'chat-inline-card__toolbar';
     wrapper.appendChild(toolbar);
   }
-  let refreshBtn = toolbar.querySelector(
-    ':scope > .chat-inline-card__refresh-btn'
+  let menuBtn = toolbar.querySelector(
+    ':scope > .chat-inline-card__menu-btn'
   ) as HTMLButtonElement | null;
-  if (!refreshBtn) {
-    refreshBtn = document.createElement('button');
-    refreshBtn.type = 'button';
-    refreshBtn.className = 'chat-inline-card__refresh-btn';
-    refreshBtn.title = '刷新卡片';
-    refreshBtn.setAttribute('aria-label', '刷新卡片');
-    refreshBtn.textContent = '↻';
-    toolbar.appendChild(refreshBtn);
+  if (!menuBtn) {
+    menuBtn = document.createElement('button');
+    menuBtn.type = 'button';
+    menuBtn.className = 'chat-inline-card__menu-btn';
+    menuBtn.title = '卡片操作';
+    menuBtn.setAttribute('aria-label', '卡片操作');
+    menuBtn.setAttribute('aria-haspopup', 'menu');
+    menuBtn.textContent = '⋯';
+    toolbar.appendChild(menuBtn);
   }
-  refreshBtn.onclick = (event) => {
+  menuBtn.onclick = (event) => {
     event.preventDefault();
     event.stopPropagation();
-    markShowTagDrawingActive(1200);
-    refreshBtn!.classList.remove('is-refreshing');
-    // 触发重放动画
-    void refreshBtn!.offsetWidth;
-    refreshBtn!.classList.add('is-refreshing');
-    try {
-      onRefresh();
-    } catch (error) {
-      debugShowHtmlLog('refresh:error', {
-        message: error instanceof Error ? error.message : String(error || '')
-      });
-    } finally {
-      window.setTimeout(() => refreshBtn?.classList.remove('is-refreshing'), 720);
-    }
+    openShowHtmlCardMenu(menuBtn!, wrapper);
   };
 }
 
@@ -787,21 +1054,29 @@ function renderShowImages(root: ParentNode | null = document) {
         };
         showHtmlJsIframeRenderByPath.set(pathKey, persistent);
       }
-      bindShowHtmlRefreshControl(persistent.wrapper, () => {
-        // 强制重新挂载同一份 srcdoc，触发 iframe 内页面重载
-        const keep = persistent?.srcdoc || srcdoc;
-        persistent.iframe.srcdoc =
-          '<!doctype html><html><head><meta charset="utf-8"></head><body></body></html>';
-        requestAnimationFrame(() => {
-          if (persistent?.iframe) {
-            persistent.iframe.srcdoc = keep;
-          }
-        });
-        debugShowHtmlLog('refresh:iframe', {
-          pathKey,
-          ratioKey: persistent?.ratioKey || ratioKey,
-          srcdocLength: keep.length
-        });
+      bindShowHtmlCardControls(persistent.wrapper, {
+        onRefresh: () => {
+          // 强制重新挂载同一份 srcdoc，触发 iframe 内页面重载
+          const keep = persistent?.srcdoc || srcdoc;
+          persistent.iframe.srcdoc =
+            '<!doctype html><html><head><meta charset="utf-8"></head><body></body></html>';
+          requestAnimationFrame(() => {
+            if (persistent?.iframe) {
+              persistent.iframe.srcdoc = keep;
+            }
+          });
+          debugShowHtmlLog('refresh:iframe', {
+            pathKey,
+            ratioKey: persistent?.ratioKey || ratioKey,
+            srcdocLength: keep.length
+          });
+        },
+        // 全屏直接复用当前 srcdoc（已含 CSP meta 与守卫脚本），沙箱保持 allow-scripts
+        getFullscreenPayload: () => {
+          const current = persistent?.srcdoc || '';
+          if (!current) return null;
+          return { srcdoc: current, allowScripts: true };
+        }
       });
       const needsUpdate =
         persistent.encoded !== effectiveEncoded ||
@@ -933,19 +1208,27 @@ function renderShowImages(root: ParentNode | null = document) {
       };
       showHtmlPersistentRenderByPath.set(pathKey, persistent);
     }
-    bindShowHtmlRefreshControl(persistent.wrapper, () => {
-      const keep = persistent?.safeHtml || '';
-      persistent.root.innerHTML = '';
-      requestAnimationFrame(() => {
-        if (persistent?.root) {
-          persistent.root.innerHTML = keep;
-        }
-      });
-      debugShowHtmlLog('refresh:shadow-root', {
-        pathKey,
-        ratioKey: persistent?.ratioKey || ratioKey,
-        safeLength: keep.length
-      });
+    bindShowHtmlCardControls(persistent.wrapper, {
+      onRefresh: () => {
+        const keep = persistent?.safeHtml || '';
+        persistent.root.innerHTML = '';
+        requestAnimationFrame(() => {
+          if (persistent?.root) {
+            persistent.root.innerHTML = keep;
+          }
+        });
+        debugShowHtmlLog('refresh:shadow-root', {
+          pathKey,
+          ratioKey: persistent?.ratioKey || ratioKey,
+          safeLength: keep.length
+        });
+      },
+      // js=off 内容已 sanitize，全屏走禁脚本沙箱 iframe，渲染效果与 Shadow DOM 一致
+      getFullscreenPayload: () => {
+        const current = persistent?.safeHtml || '';
+        if (!current.trim()) return null;
+        return { srcdoc: buildShowHtmlIframeSrcdoc(current), allowScripts: false };
+      }
     });
 
     const needsUpdate =
@@ -1369,6 +1652,9 @@ export function teardownShowImageObserver() {
   showHtmlJsPendingRenderByPath.clear();
   showHtmlJsIframeRenderByPath.clear();
   showTagObservedContainer = null;
+  // 菜单/全屏层是全局单例，卡片 Map 清空后其引用的 wrapper 已卸载，必须一并关闭
+  closeShowHtmlCardMenu();
+  closeShowHtmlFullscreen();
 }
 
 function updateViewportHeightVar() {
diff --git a/static/src/styles/components/chat/_chat-area.scss b/static/src/styles/components/chat/_chat-area.scss
index af6b66dd..f3fa58c9 100644
--- a/static/src/styles/components/chat/_chat-area.scss
+++ b/static/src/styles/components/chat/_chat-area.scss
@@ -1758,42 +1758,42 @@ body[data-theme='dark'] .more-icon {
   pointer-events: none;
 }
 
-.chat-inline-card__refresh-btn {
+/* ⋯ 菜单按钮：纯文字风格，无边框无背景，hover 仅变色；保留 26px 点击热区 */
+.chat-inline-card__menu-btn {
   pointer-events: auto;
   width: 26px;
   height: 26px;
-  border-radius: 999px;
-  border: 1px solid var(--border-default);
-  background: color-mix(in srgb, var(--surface-card) 78%, transparent);
+  border: 0;
+  background: transparent;
   color: var(--text-secondary);
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  font-size: 15px;
+  font-size: 16px;
   line-height: 1;
+  /* ⋯ 字形视觉重心偏下，上抬补偵使其看起来居中 */
+  padding-bottom: 5px;
   cursor: pointer;
-  transition:
-    color 0.18s ease,
-    border-color 0.18s ease,
-    background 0.18s ease;
+  transition: color 0.18s ease;
 }
 
-.chat-inline-card__refresh-btn:hover {
+.chat-inline-card__menu-btn:hover {
   color: var(--text-primary);
-  border-color: var(--accent);
-  background: color-mix(in srgb, var(--highlight) 72%, transparent);
 }
 
-.chat-inline-card__refresh-btn.is-refreshing {
-  animation: chat-inline-refresh-spin 0.6s linear 1;
+.chat-inline-card__menu-btn.is-refreshing {
+  animation: chat-inline-menu-pulse 0.6s ease 1;
 }
 
-@keyframes chat-inline-refresh-spin {
-  from {
-    transform: rotate(0deg);
+@keyframes chat-inline-menu-pulse {
+  0% {
+    opacity: 1;
   }
-  to {
-    transform: rotate(360deg);
+  40% {
+    opacity: 0.35;
+  }
+  100% {
+    opacity: 1;
   }
 }
 
@@ -1818,6 +1818,148 @@ body[data-theme='dark'] .more-icon {
   background: transparent;
 }
 
+/* ---------------- show_html 卡片 ⋯ 菜单（全局 fixed 单例） ---------------- */
+
+.show-html-card-menu {
+  position: fixed;
+  z-index: 3050;
+  min-width: 112px;
+  padding: 4px;
+  background: var(--surface-raised);
+  border: 1px solid var(--border-default);
+  border-radius: 8px;
+  box-shadow: var(--shadow-card);
+  animation: show-html-card-menu-in 0.16s ease-out;
+}
+
+@keyframes show-html-card-menu-in {
+  from {
+    opacity: 0;
+    transform: translateY(-3px) scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.show-html-card-menu__item {
+  display: flex;
+  align-items: center;
+  width: 100%;
+  height: 32px;
+  padding: 0 12px;
+  background: none;
+  border: none;
+  border-radius: 5px;
+  font-size: 13px;
+  text-align: left;
+  color: var(--text-primary);
+  cursor: pointer;
+  transition: background 0.12s ease;
+}
+
+.show-html-card-menu__item:hover {
+  background: var(--surface-soft);
+}
+
+/* ---------------- show_html 全屏预览 overlay ---------------- */
+
+/* 打开期间锁定底层页面滚动（聊天区滚动容器在 body 下） */
+html.show-html-fullscreen-open,
+html.show-html-fullscreen-open body {
+  overflow: hidden;
+}
+
+.show-html-fullscreen {
+  display: none;
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  /* 与聊天区同一套视口高度变量，规避移动端 100vh 地址栏问题 */
+  height: var(--app-viewport, 100vh);
+  z-index: 3000;
+  background: var(--surface-base);
+  flex-direction: column;
+}
+
+.show-html-fullscreen.is-open {
+  display: flex;
+}
+
+.show-html-fullscreen__bar {
+  flex: 0 0 auto;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  /* 手机刘海/状态栏安全区；移动端无法 Esc，关闭按钮必须永远可见可达 */
+  padding: calc(8px + env(safe-area-inset-top, 0px))
+    calc(10px + env(safe-area-inset-right, 0px)) 8px
+    calc(16px + env(safe-area-inset-left, 0px));
+  border-bottom: 1px solid var(--border-default);
+}
+
+.show-html-fullscreen__title {
+  font-size: 13px;
+  color: var(--text-secondary);
+  line-height: 1;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.show-html-fullscreen__actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex: 0 0 auto;
+}
+
+/* 与卡片 ⋯ 按钮一致的纯文字风格：无边框无背景，hover 仅变色 */
+.show-html-fullscreen__btn {
+  width: 32px;
+  height: 32px;
+  border: 0;
+  background: transparent;
+  color: var(--text-secondary);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 16px;
+  line-height: 1;
+  cursor: pointer;
+  transition: color 0.18s ease;
+}
+
+.show-html-fullscreen__btn:hover {
+  color: var(--text-primary);
+}
+
+.show-html-fullscreen__body {
+  flex: 1 1 auto;
+  min-height: 0;
+  position: relative;
+}
+
+.show-html-fullscreen__iframe {
+  display: block;
+  width: 100%;
+  height: 100%;
+  border: 0;
+  background: transparent;
+}
+
+/* 移动端加大热区，保证触屏可可靠点中关闭按钮 */
+@media (max-width: 768px) {
+  .show-html-fullscreen__btn {
+    width: 36px;
+    height: 36px;
+    font-size: 16px;
+  }
+}
+
 /* 兼容旧类名（可逐步移除） */
 .chat-inline-image__error {
   @extend .chat-inline-card__error;