diff --git a/components/flow-board/drawnix-workspace.tsx b/components/flow-board/drawnix-workspace.tsx
index aab5d2434..9e9c2a165 100644
--- a/components/flow-board/drawnix-workspace.tsx
+++ b/components/flow-board/drawnix-workspace.tsx
@@ -31,7 +31,6 @@ import { fetchUploadWithRetry } from "@/lib/client/upload-with-retry";
 import {
   CheckCircle2,
   ChevronDown,
-  ChevronLeft,
   FileText,
   FolderOpen,
   Flag,
@@ -47,6 +46,12 @@ import {
   X,
 } from "lucide-react";
 import { useTheme } from "next-themes";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from "@/components/ui/tooltip";
 import {
   type ChangeEvent,
   type ClipboardEvent,
@@ -116,6 +121,10 @@ const FLOW_BOARD_IMAGE_UPLOAD_TYPES = new Set([
   "image/png",
   "image/webp",
 ]);
+const FLOW_BOARD_SIDEBAR_BUTTON_CLASS =
+  "flex h-10 w-10 items-center justify-center rounded-full text-[#4f566b] transition-colors hover:bg-black/5 hover:text-[#111827] disabled:cursor-not-allowed disabled:opacity-45";
+const FLOW_BOARD_SIDEBAR_BUTTON_ACTIVE_CLASS =
+  "bg-[#111827] text-white shadow-sm hover:bg-[#1f2937] hover:text-white";
 const FLOW_BOARD_MARKER_GROUPS: FlowBoardMarkerGroup[] = [
   {
     id: "tag",
@@ -1374,132 +1383,154 @@ export function DrawnixWorkspace({
         ref={mindMapFileInputRef}
         type="file"
       />
-      <div className="pointer-events-none absolute top-4 left-4 z-20 flex items-center">
-        <div
-          className="pointer-events-auto flex h-11 items-center gap-3 rounded-2xl border border-black/5 bg-white px-3 shadow-sm transition-all hover:shadow-md"
-          data-flow-board-shell-control="true"
-        >
-          <button
-            className="group flex items-center gap-1 rounded-xl px-2 py-1.5 font-medium text-[#4f566b] text-sm transition-colors hover:bg-black/5 hover:text-[#111827]"
-            onClick={() => {
-              window.location.href = "/";
-            }}
-            type="button"
-          >
-            <ChevronLeft className="group-hover:-translate-x-0.5 h-4 w-4 transition-transform" />
-            返回
-          </button>
-
-          <div className="h-5 w-px bg-black/10" />
-
-          <div className="flex items-center gap-2.5 px-1">
-            {displayLogo ? (
-              <img
-                alt={siteName}
-                className="h-6 w-6 rounded-md object-cover shadow-sm"
-                src={displayLogo}
-              />
-            ) : (
-              <div className="flex h-6 w-6 shrink-0 items-center justify-center rounded-md bg-[#111827] font-bold text-white text-xs shadow-sm">
-                {siteName.slice(0, 1).toUpperCase()}
-              </div>
-            )}
-            <div className="flex items-center gap-2">
-              <input
-                aria-label="流程白板文件名"
-                className="h-7 w-fit min-w-[120px] max-w-[200px] rounded-lg border border-transparent bg-transparent px-2 font-bold text-[#111827] text-sm tracking-wide outline-none transition focus:border-black/10 focus:bg-[#f7f8fb]"
-                onBlur={handleTitleCommit}
-                onChange={(event) => setCurrentTitle(event.target.value)}
-                onKeyDown={(event) => {
-                  if (event.key === "Enter") {
-                    event.currentTarget.blur();
-                  }
-                }}
-                value={currentTitle}
-              />
-              <span className="shrink-0 rounded-md bg-[#f7f8fb] px-1.5 py-0.5 font-medium text-[#7a8297] text-[11px]">
-                {siteName}
-              </span>
-            </div>
-          </div>
-
-          <div className="h-5 w-px bg-black/10" />
-
-          <div className="flex flex-1 items-center justify-between gap-2">
-            <div className="flex items-center gap-1">
+      <aside
+        className="pointer-events-none absolute top-4 left-4 z-20 flex flex-col items-center gap-2 lg:top-6 lg:left-6"
+        data-flow-board-shell-control="true"
+      >
+        <TooltipProvider delayDuration={120}>
+          <Tooltip>
+            <TooltipTrigger asChild>
               <button
-                className="flex h-8 items-center gap-1.5 rounded-xl px-2.5 font-medium text-[#4f566b] text-xs transition-colors hover:bg-black/5 hover:text-[#111827]"
-                disabled={isSavingNow}
-                onClick={() => flushPendingSave(true)}
-                type="button"
-              >
-                {isSavingNow ? (
-                  <Loader2 className="h-3.5 w-3.5 animate-spin" />
-                ) : (
-                  <Save className="h-3.5 w-3.5" />
-                )}
-                保存云端
-              </button>
-
-              <button
-                className="flex h-8 items-center gap-1.5 rounded-xl px-2.5 font-medium text-[#4f566b] text-xs transition-colors hover:bg-black/5 hover:text-[#111827]"
-                onClick={handleOpenFilePanel}
-                type="button"
-              >
-                <FolderOpen className="h-3.5 w-3.5" />
-                云文件
-              </button>
-
-              <button
-                className="flex h-8 items-center gap-1.5 rounded-xl px-2.5 font-medium text-[#4f566b] text-xs transition-colors hover:bg-black/5 hover:text-[#111827] disabled:cursor-not-allowed disabled:opacity-50"
-                disabled={isSavingNow || isImportingMindMap}
-                onClick={() => mindMapFileInputRef.current?.click()}
-                type="button"
-              >
-                {isImportingMindMap ? (
-                  <Loader2 className="h-3.5 w-3.5 animate-spin" />
-                ) : (
-                  <Upload className="h-3.5 w-3.5" />
-                )}
-                导入
-              </button>
-
-              <button
-                className={`flex h-8 items-center gap-1.5 rounded-xl px-2.5 font-medium text-xs transition-colors ${
-                  isMarkerPanelOpen
-                    ? "bg-[#111827] text-white shadow-sm hover:bg-[#1f2937]"
-                    : "text-[#4f566b] hover:bg-black/5 hover:text-[#111827]"
-                }`}
+                className="pointer-events-auto flex h-[52px] w-[52px] items-center justify-center gap-3 rounded-full border border-black/10 bg-white px-2.5 text-left shadow transition hover:bg-black/[0.03] hover:shadow-md lg:w-[164px] lg:justify-start lg:px-4"
                 onClick={() => {
-                  setIsFilePanelOpen(false);
-                  setIsMarkerPanelOpen((open) => !open);
-                  refreshMarkerSelectionState();
+                  window.location.href = "/";
                 }}
+                title="返回首页"
                 type="button"
               >
-                <Tag className="h-3.5 w-3.5" />
-                标记
+                {displayLogo ? (
+                  <img
+                    alt={siteName}
+                    className="h-8 w-8 rounded-full object-cover"
+                    src={displayLogo}
+                  />
+                ) : (
+                  <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-black font-bold text-white text-sm">
+                    {siteName.slice(0, 1).toUpperCase()}
+                  </div>
+                )}
+                <span className="hidden min-w-0 truncate font-semibold text-[#111827] text-[15px] leading-none tracking-tight lg:block">
+                  {siteName}
+                </span>
               </button>
+            </TooltipTrigger>
+            <TooltipContent side="right">返回首页</TooltipContent>
+          </Tooltip>
 
-              <button
-                className="flex h-8 items-center gap-1.5 rounded-xl px-2.5 font-medium text-[#4f566b] text-xs transition-colors hover:bg-black/5 hover:text-[#111827]"
-                onClick={handleCreateCloudFile}
-                type="button"
-              >
-                <Plus className="h-3.5 w-3.5" />
-                新建
-              </button>
-            </div>
-
-            <div className="flex shrink-0 items-center gap-1.5 pl-2 text-[#7a8297]">
-              <Save className="h-3.5 w-3.5" />
-              <span className="whitespace-nowrap font-medium text-xs">
-                {formatSavedAt(lastSavedAt)}
-              </span>
+          <div className="pointer-events-auto hidden w-[164px] rounded-[22px] border border-black/10 bg-white px-3 py-2 shadow lg:block">
+            <div className="mb-1 px-1 font-medium text-[#7a8297] text-[10px] uppercase tracking-[0.18em]">
+              流程白板
             </div>
+            <input
+              aria-label="流程白板文件名"
+              className="h-8 w-full rounded-xl border border-transparent bg-transparent px-1 font-semibold text-[#111827] text-sm tracking-wide outline-none transition focus:border-black/10 focus:bg-[#f7f8fb]"
+              onBlur={handleTitleCommit}
+              onChange={(event) => setCurrentTitle(event.target.value)}
+              onKeyDown={(event) => {
+                if (event.key === "Enter") {
+                  event.currentTarget.blur();
+                }
+              }}
+              value={currentTitle}
+            />
           </div>
-        </div>
-      </div>
+
+          <div className="pointer-events-auto flex max-h-[calc(100vh-148px)] w-[56px] flex-col items-center gap-1 overflow-y-auto rounded-[28px] border border-black/10 bg-white px-1.5 py-2.5 shadow lg:max-h-[calc(100vh-236px)]">
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <button
+                  className={FLOW_BOARD_SIDEBAR_BUTTON_CLASS}
+                  disabled={isSavingNow}
+                  onClick={() => flushPendingSave(true)}
+                  title="保存云端"
+                  type="button"
+                >
+                  {isSavingNow ? (
+                    <Loader2 className="h-[18px] w-[18px] animate-spin" />
+                  ) : (
+                    <Save className="h-[18px] w-[18px]" />
+                  )}
+                </button>
+              </TooltipTrigger>
+              <TooltipContent side="right">保存云端</TooltipContent>
+            </Tooltip>
+
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <button
+                  className={FLOW_BOARD_SIDEBAR_BUTTON_CLASS}
+                  onClick={handleOpenFilePanel}
+                  title="云文件"
+                  type="button"
+                >
+                  <FolderOpen className="h-[18px] w-[18px]" />
+                </button>
+              </TooltipTrigger>
+              <TooltipContent side="right">云文件</TooltipContent>
+            </Tooltip>
+
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <button
+                  className={FLOW_BOARD_SIDEBAR_BUTTON_CLASS}
+                  disabled={isSavingNow || isImportingMindMap}
+                  onClick={() => mindMapFileInputRef.current?.click()}
+                  title="导入"
+                  type="button"
+                >
+                  {isImportingMindMap ? (
+                    <Loader2 className="h-[18px] w-[18px] animate-spin" />
+                  ) : (
+                    <Upload className="h-[18px] w-[18px]" />
+                  )}
+                </button>
+              </TooltipTrigger>
+              <TooltipContent side="right">导入</TooltipContent>
+            </Tooltip>
+
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <button
+                  className={`${FLOW_BOARD_SIDEBAR_BUTTON_CLASS} ${
+                    isMarkerPanelOpen ? FLOW_BOARD_SIDEBAR_BUTTON_ACTIVE_CLASS : ""
+                  }`}
+                  onClick={() => {
+                    setIsFilePanelOpen(false);
+                    setIsMarkerPanelOpen((open) => !open);
+                    refreshMarkerSelectionState();
+                  }}
+                  title="标记"
+                  type="button"
+                >
+                  <Tag className="h-[18px] w-[18px]" />
+                </button>
+              </TooltipTrigger>
+              <TooltipContent side="right">标记</TooltipContent>
+            </Tooltip>
+
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <button
+                  className={FLOW_BOARD_SIDEBAR_BUTTON_CLASS}
+                  onClick={handleCreateCloudFile}
+                  title="新建"
+                  type="button"
+                >
+                  <Plus className="h-[18px] w-[18px]" />
+                </button>
+              </TooltipTrigger>
+              <TooltipContent side="right">新建</TooltipContent>
+            </Tooltip>
+          </div>
+
+          <div className="pointer-events-auto hidden max-w-[164px] items-center gap-1.5 rounded-full border border-black/10 bg-white px-3 py-1.5 text-[#7a8297] shadow lg:flex">
+            <Save className="h-3.5 w-3.5 shrink-0" />
+            <span className="truncate font-medium text-[11px]">
+              {formatSavedAt(lastSavedAt)}
+            </span>
+          </div>
+        </TooltipProvider>
+      </aside>
 
       {isFilePanelOpen ? (
         <aside