diff --git a/README.md b/README.md
index f118b03..a9ba891 100644
--- a/README.md
+++ b/README.md
@@ -97,4 +97,4 @@ API 测试使用本机临时后端和独立前端进程，检查会话 Cookie、
 
 ## 悬浮栏尺寸
 
-左上角显示当前图谱标题，复用页面已读取的资料，不额外请求后端；长标题省略并可悬停查看。左上、右上、底部与帮助按钮共用 `toolbar.module.css`：图标/Logo/浮框头像 32px，图标按钮 44×40px，主文字 14px，容器内边距 4px，间隙 2px，圆角 8px。悬浮栏距屏幕边缘统一为 12px；右上角窄屏时下移避免与标题重叠。
+左上角显示当前图谱标题，复用页面已读取的资料，不额外请求后端；长标题省略并可悬停查看。左上、右上、底部与帮助按钮共用 `toolbar.module.css`：图标/Logo/浮框头像 20px，图标按钮含 padding 的总尺寸为 32×32px，主文字 14px，容器内边距 4px，间隙 2px，圆角 8px。悬浮栏距屏幕边缘统一为 12px；右上角窄屏时下移避免与标题重叠。
diff --git a/VALIDATION.md b/VALIDATION.md
index 965589a..3f50748 100644
--- a/VALIDATION.md
+++ b/VALIDATION.md
@@ -82,3 +82,9 @@
 - 按用户要求将共享悬浮栏图标、Logo 和头像改为 32×32px，按钮改为 44×40px，主文字 14px；保留 4px 容器内边距，整体高度 50px。
 - Logo 切换到 32/64/128px 原始资源，账户与帮助弹出框偏移同步调整，窄屏工具栏允许横向滚动。
 - 类型检查和差异检查通过。本次为尺寸试调，未重复生产构建，未访问浏览器。
+
+## 修正 32×32 总尺寸（2026-11-06）
+
+- 用户澄清 32×32 指包含 padding 的按钮总尺寸。统一使用 border-box 的 32×32px 按钮，内部图标、Logo 与浮框头像为 20px，保留上下 4px、左右 6px 内边距；主文字仍为 14px。
+- 公共图标按钮默认尺寸同步修正，悬浮栏整体高度为 42px；账户和帮助弹出框偏移随之调整，保留高清 Logo 资源。
+- 类型检查及差异检查通过；本次尺寸修正未重复构建或访问浏览器。
diff --git a/src/app/dashboard/dashboard.tsx b/src/app/dashboard/dashboard.tsx
index 75f359f..7a58041 100644
--- a/src/app/dashboard/dashboard.tsx
+++ b/src/app/dashboard/dashboard.tsx
@@ -157,7 +157,7 @@ export default function DashboardSidebar() {
             <Link href="/" className={styles.logoLink} aria-label="啡跃 Endoleap 主页" title="返回主页">
               <img src="/brand/png/logo-light/endoleap-32.png"
                 srcSet="/brand/png/logo-light/endoleap-32.png 1x, /brand/png/logo-light/endoleap-64.png 2x, /brand/png/logo-light/endoleap-128.png 4x"
-                width={32} height={32} alt="" />
+                width={20} height={20} alt="" />
             </Link>
             <h1 className={styles.floatingTitle} title={currentTitle}>{currentTitle}</h1>
             <button type="button" className={styles.floatingAvatarButton} popoverTarget="workspace-account" aria-label="账户和工作空间">
diff --git a/src/components/canvas/canvas.module.css b/src/components/canvas/canvas.module.css
index 0703b97..4a4ba73 100644
--- a/src/components/canvas/canvas.module.css
+++ b/src/components/canvas/canvas.module.css
@@ -14,17 +14,17 @@
 .toolbar button:disabled { cursor: not-allowed; }
 .divider { flex: 0 0 1px; width: 1px; height: 16px; margin: 0 2px; background: #ece6df; }
 .topRight { position: absolute; top: 12px; right: 12px; z-index: 10; display: flex; flex-direction: column; align-items: flex-end; gap: 3px; }
-.toolbar .zoomValue { box-sizing: border-box; flex: 0 0 48px; width: 48px; height: var(--toolbar-control-height, 40px); padding: 0; border-radius: 5px; font: inherit; font-variant-numeric: tabular-nums; }
+.toolbar .zoomValue { box-sizing: border-box; flex: 0 0 48px; width: 48px; height: var(--toolbar-control-height, 32px); padding: 0; border-radius: 5px; font: inherit; font-variant-numeric: tabular-nums; }
 .toolbar .zoomValue:hover { background: #e9e7e3; }
 .saveStatus { padding-right: 5px; font-size: 10px; color: #a59b90; }
 .bottomToolbar { position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%); z-index: 10; }
-.helpPopup { position: fixed; inset: auto 12px 70px auto; margin: 0; width: 330px; max-width: calc(100vw - 32px); max-height: calc(100dvh - 110px); overflow-y: auto; padding: 18px; border: 1px solid #e2dcd3; border-radius: 12px; background: white; color: #6d6054; box-shadow: 0 8px 30px #32251a14; font-size: 12px; line-height: 1.7; }
+.helpPopup { position: fixed; inset: auto 12px 62px auto; margin: 0; width: 330px; max-width: calc(100vw - 32px); max-height: calc(100dvh - 110px); overflow-y: auto; padding: 18px; border: 1px solid #e2dcd3; border-radius: 12px; background: white; color: #6d6054; box-shadow: 0 8px 30px #32251a14; font-size: 12px; line-height: 1.7; }
 .helpPopup strong { color: #49372e; font-size: 13px; }
 .helpPopup p { margin-top: 9px; }
 .error { position: absolute; top: 78px; left: 50%; transform: translateX(-50%); max-width: min(500px, calc(100vw - 32px)); padding: 10px 14px; border: 1px solid #e5c7b8; border-radius: 8px; color: #a25439; background: #fff9f3; font-size: 12px; z-index: 15; }
 .helpToolbar { position: absolute; right: 12px; bottom: 12px; z-index: 10; }
 @media (max-width: 700px) {
-  .topRight { top: 70px; right: 12px; }
+  .topRight { top: 62px; right: 12px; }
   .bottomToolbar { left: 12px; bottom: 12px; transform: none; max-width: calc(100vw - 92px); overflow-x: auto; overscroll-behavior-x: contain; }
 }
 
diff --git a/src/components/ui/icon-button.module.css b/src/components/ui/icon-button.module.css
index 96323e9..bd7b568 100644
--- a/src/components/ui/icon-button.module.css
+++ b/src/components/ui/icon-button.module.css
@@ -4,8 +4,8 @@
   justify-content: center;
   flex: 0 0 auto;
   box-sizing: border-box;
-  width: var(--toolbar-control-width, 28px);
-  height: var(--toolbar-control-height, 24px);
+  width: var(--toolbar-control-width, 32px);
+  height: var(--toolbar-control-height, 32px);
   padding: 4px 6px;
   border: 0;
   border-radius: 5px;
@@ -13,7 +13,7 @@
   color: inherit;
   cursor: pointer;
 }
-.button svg { width: var(--toolbar-icon-size, 16px); height: var(--toolbar-icon-size, 16px); flex: 0 0 var(--toolbar-icon-size, 16px); }
+.button svg { width: var(--toolbar-icon-size, 20px); height: var(--toolbar-icon-size, 20px); flex: 0 0 var(--toolbar-icon-size, 20px); }
 .button:hover { background: #e9e7e3; }
 .button:focus-visible { outline: 2px solid #9d7d66; outline-offset: 2px; }
 .button:disabled { opacity: 0.45; cursor: not-allowed; }
diff --git a/src/components/ui/toolbar.module.css b/src/components/ui/toolbar.module.css
index 462dead..2c86db5 100644
--- a/src/components/ui/toolbar.module.css
+++ b/src/components/ui/toolbar.module.css
@@ -1,7 +1,7 @@
 .surface {
-  --toolbar-icon-size: 32px;
-  --toolbar-control-width: 44px;
-  --toolbar-control-height: 40px;
+  --toolbar-icon-size: 20px;
+  --toolbar-control-width: 32px;
+  --toolbar-control-height: 32px;
   display: flex;
   align-items: center;
   gap: 2px;
diff --git a/src/components/workspace/workspace.module.css b/src/components/workspace/workspace.module.css
index 68bd91e..b4c0990 100644
--- a/src/components/workspace/workspace.module.css
+++ b/src/components/workspace/workspace.module.css
@@ -112,15 +112,15 @@
 @media (max-width: 600px) { .shell { --sidebar-width: 240px; } }
 @media (prefers-reduced-motion: reduce) { .accountPopup:popover-open { animation: none; } }
 
-.logoLink { display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; box-sizing: border-box; width: var(--toolbar-control-width, 28px); height: var(--toolbar-control-height, 24px); padding: 4px 6px; border-radius: 5px; }
-.logoLink img { display: block; width: var(--toolbar-icon-size, 16px); height: var(--toolbar-icon-size, 16px); }
+.logoLink { display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; box-sizing: border-box; width: var(--toolbar-control-width, 32px); height: var(--toolbar-control-height, 32px); padding: 4px 6px; border-radius: 5px; }
+.logoLink img { display: block; width: var(--toolbar-icon-size, 20px); height: var(--toolbar-icon-size, 20px); }
 .logoLink:hover { background: #e9e7e3; }
 .logoLink:focus-visible { outline: 2px solid #9d7d66; outline-offset: 2px; }
 
-.floatingAvatarButton { display: grid; place-items: center; flex: 0 0 auto; box-sizing: border-box; width: var(--toolbar-control-width, 28px); height: var(--toolbar-control-height, 24px); border-radius: 5px; }
+.floatingAvatarButton { display: grid; place-items: center; flex: 0 0 auto; box-sizing: border-box; width: var(--toolbar-control-width, 32px); height: var(--toolbar-control-height, 32px); border-radius: 5px; }
 .floatingAvatarButton:hover { background: #e9e7e3; }
-.accountPopup[data-floating="true"] { inset: 70px auto auto 12px; max-height: calc(100dvh - 84px); transform-origin: top left; }
+.accountPopup[data-floating="true"] { inset: 62px auto auto 12px; max-height: calc(100dvh - 76px); transform-origin: top left; }
 
-.floatingAvatarButton .avatar { flex-basis: var(--toolbar-icon-size, 16px); width: var(--toolbar-icon-size, 16px); height: var(--toolbar-icon-size, 16px); font-size: 14px; }
-.floatingTitle { flex: 1 1 auto; min-width: 0; max-width: 240px; margin: 0 4px; color: #37352f; font-size: 14px; line-height: var(--toolbar-control-height, 40px); font-weight: 500; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
+.floatingAvatarButton .avatar { flex-basis: var(--toolbar-icon-size, 20px); width: var(--toolbar-icon-size, 20px); height: var(--toolbar-icon-size, 20px); font-size: 14px; }
+.floatingTitle { flex: 1 1 auto; min-width: 0; max-width: 240px; margin: 0 4px; color: #37352f; font-size: 14px; line-height: var(--toolbar-control-height, 32px); font-weight: 500; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
 @media (max-width: 700px) { .floatingTitle { max-width: 180px; } }