diff --git a/frontend/src/components/ui/context-menu.tsx b/frontend/src/components/ui/context-menu.tsx
index 5aaca765..8785f3f5 100644
--- a/frontend/src/components/ui/context-menu.tsx
+++ b/frontend/src/components/ui/context-menu.tsx
@@ -102,7 +102,7 @@ function ContextMenuContent({
       <ContextMenuPrimitive.Content
         data-slot="context-menu-content"
         className={cn(
-          "z-50 max-h-(--radix-context-menu-content-available-height) min-w-[8rem] origin-(--radix-context-menu-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border bg-popover p-1 text-popover-foreground shadow-md data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95",
+          "z-50 max-h-(--radix-context-menu-content-available-height) min-w-[8rem] origin-(--radix-context-menu-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border bg-popover p-0 text-popover-foreground shadow-md data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95",
           className
         )}
         {...props}
diff --git a/frontend/src/components/ui/slider.tsx b/frontend/src/components/ui/slider.tsx
new file mode 100644
index 00000000..46ebc4b4
--- /dev/null
+++ b/frontend/src/components/ui/slider.tsx
@@ -0,0 +1,63 @@
+"use client"
+
+import * as React from "react"
+import { Slider as SliderPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Slider({
+  className,
+  defaultValue,
+  value,
+  min = 0,
+  max = 100,
+  ...props
+}: React.ComponentProps<typeof SliderPrimitive.Root>) {
+  const _values = React.useMemo(
+    () =>
+      Array.isArray(value)
+        ? value
+        : Array.isArray(defaultValue)
+          ? defaultValue
+          : [min, max],
+    [value, defaultValue, min, max]
+  )
+
+  return (
+    <SliderPrimitive.Root
+      data-slot="slider"
+      defaultValue={defaultValue}
+      value={value}
+      min={min}
+      max={max}
+      className={cn(
+        "relative flex w-full touch-none items-center select-none data-[disabled]:opacity-50 data-[orientation=vertical]:h-full data-[orientation=vertical]:min-h-44 data-[orientation=vertical]:w-auto data-[orientation=vertical]:flex-col",
+        className
+      )}
+      {...props}
+    >
+      <SliderPrimitive.Track
+        data-slot="slider-track"
+        className={cn(
+          "relative grow overflow-hidden rounded-full bg-muted data-[orientation=horizontal]:h-1.5 data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-1.5"
+        )}
+      >
+        <SliderPrimitive.Range
+          data-slot="slider-range"
+          className={cn(
+            "absolute bg-primary data-[orientation=horizontal]:h-full data-[orientation=vertical]:w-full"
+          )}
+        />
+      </SliderPrimitive.Track>
+      {Array.from({ length: _values.length }, (_, index) => (
+        <SliderPrimitive.Thumb
+          data-slot="slider-thumb"
+          key={index}
+          className="block size-4 shrink-0 rounded-full border border-primary bg-white shadow-sm ring-ring/50 transition-[color,box-shadow] hover:ring-4 focus-visible:ring-4 focus-visible:outline-hidden disabled:pointer-events-none disabled:opacity-50"
+        />
+      ))}
+    </SliderPrimitive.Root>
+  )
+}
+
+export { Slider }
diff --git a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
index ab5b0c74..c54cb0e8 100644
--- a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
+++ b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
@@ -34,6 +34,7 @@ import {
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
 import { DropdownSelector } from "@/components/ui/dropdown-selector";
+import { Slider } from "@/components/ui/slider";
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
 import { CodeEditor } from "@/components/workspace/code-editor";
 import { useArtifactContent } from "@/core/artifacts/hooks";
@@ -457,10 +458,11 @@ export function ArtifactFileDetail({
               </ToggleGroupItem>
             </ToggleGroup>
           )}
-          {/* 仅在代码视图显示缩放控制 */}
-          {isCodeFile && viewMode === "code" && (
+          {/* 代码视图显示缩放控制；Markdown 预览也显示缩放控制 */}
+          {(isCodeFile && viewMode === "code") ||
+          (language === "markdown" && viewMode === "preview") ? (
             <ArtifactZoomSelector value={zoom} onChange={setZoom} />
-          )}
+          ) : null}
         </div>
         <div className="col-span-6 flex min-w-0 items-center justify-center px-1">
           <ArtifactTitle>
@@ -1652,106 +1654,75 @@ export const ArtifactZoomSelector = ({
   ...props
 }: ArtifactZoomSelectorProps) => {
   const { t } = useI18n();
-  const handleZoomIn = () => {
-    const currentIndex = ZOOM_LEVELS.indexOf(value);
-    const nextValue = ZOOM_LEVELS[currentIndex + 1];
-    if (currentIndex < ZOOM_LEVELS.length - 1 && nextValue !== undefined) {
-      onChange?.(nextValue);
-    }
-  };
-
-  const handleZoomOut = () => {
-    const currentIndex = ZOOM_LEVELS.indexOf(value);
-    const prevValue = ZOOM_LEVELS[currentIndex - 1];
-    if (currentIndex > 0 && prevValue !== undefined) {
-      onChange?.(prevValue);
-    }
-  };
-
-  const canZoomIn = ZOOM_LEVELS.indexOf(value) < ZOOM_LEVELS.length - 1;
-  const canZoomOut = ZOOM_LEVELS.indexOf(value) > 0;
+  const resolvedIndex = useMemo(() => {
+    const exactIndex = ZOOM_LEVELS.indexOf(value);
+    if (exactIndex >= 0) return exactIndex;
+    let nearestIndex = 0;
+    let nearestDistance = Number.POSITIVE_INFINITY;
+    ZOOM_LEVELS.forEach((level, index) => {
+      const distance = Math.abs(level - value);
+      if (distance < nearestDistance) {
+        nearestDistance = distance;
+        nearestIndex = index;
+      }
+    });
+    return nearestIndex;
+  }, [value]);
 
   return (
-    <div
-      className={cn(
-        "bg-background border-border inline-flex h-[28px] items-center gap-1 rounded-[10px] border backdrop-blur-sm",
-        "dark:border-border dark:bg-background",
-        className,
-      )}
-      {...props}
-    >
-      <button
-        type="button"
-        onClick={handleZoomIn}
-        disabled={!canZoomIn}
-        className={cn(
-          "flex h-full w-10 items-center justify-center rounded py-1 transition-colors",
-          "text-muted-foreground hover:bg-muted hover:text-foreground",
-          "disabled:cursor-not-allowed disabled:opacity-40 disabled:hover:bg-transparent",
-          "dark:text-muted-foreground dark:hover:bg-muted dark:hover:text-foreground",
-        )}
-        aria-label={t.artifactPreview.zoomIn}
-      >
-        <svg
-          xmlns="http://www.w3.org/2000/svg"
-          width="16"
-          height="16"
-          viewBox="0 0 16 16"
-          fill="none"
-        >
-          <circle cx="7.55558" cy="7.55534" r="6.16667" stroke="#666666" />
-          <path
-            d="M13.8688 15.4646C14.064 15.6598 14.3806 15.6598 14.5759 15.4646C14.7711 15.2693 14.7711 14.9527 14.5759 14.7574L14.2223 15.111L13.8688 15.4646ZM14.2223 15.111L14.5759 14.7574L11.9092 12.0908L11.5557 12.4443L11.2021 12.7979L13.8688 15.4646L14.2223 15.111Z"
-            fill="#666666"
+    <div className={cn("inline-flex", className)} {...props}>
+      <DropdownMenu>
+        <DropdownMenuTrigger asChild>
+          <button
+            type="button"
+            aria-label={t.artifactPreview.zoomIn}
+            className={cn(
+              "bg-background border-border text-muted-foreground hover:text-foreground inline-flex h-[28px] w-[28px] items-center justify-center rounded-[10px] border transition-colors",
+              "hover:bg-muted/60",
+            )}
+          >
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              width="16"
+              height="16"
+              viewBox="0 0 16 16"
+              fill="none"
+            >
+              <circle cx="7.55558" cy="7.55534" r="6.16667" stroke="#666666" />
+              <path
+                d="M13.8688 15.4646C14.064 15.6598 14.3806 15.6598 14.5759 15.4646C14.7711 15.2693 14.7711 14.9527 14.5759 14.7574L14.2223 15.111L13.8688 15.4646ZM14.2223 15.111L14.5759 14.7574L11.9092 12.0908L11.5557 12.4443L11.2021 12.7979L13.8688 15.4646L14.2223 15.111Z"
+                fill="#666666"
+              />
+              <path
+                d="M5.33325 7.5H9.7777M7.55547 5V10"
+                stroke="#666666"
+                strokeLinecap="round"
+                strokeLinejoin="round"
+              />
+            </svg>
+          </button>
+        </DropdownMenuTrigger>
+        <DropdownMenuContent align="start" sideOffset={8} className="w-52 p-[20px] ">
+          <div className="mb-2 flex items-center justify-between">
+            <span className="text-muted-foreground text-xs">
+              {ZOOM_LEVELS[0]}%
+            </span>
+            <span className="text-foreground text-xs font-medium">{value}%</span>
+          </div>
+          <Slider
+            min={0}
+            max={ZOOM_LEVELS.length - 1}
+            step={1}
+            value={[resolvedIndex]}
+            onValueChange={(values) => {
+              const nextIndex = values[0];
+              if (nextIndex === undefined) return;
+              const nextValue = ZOOM_LEVELS[nextIndex];
+              if (nextValue !== undefined) onChange?.(nextValue);
+            }}
           />
-          <path
-            d="M5.33325 7.5H9.7777M7.55547 5V10"
-            stroke="#666666"
-            strokeLinecap="round"
-            strokeLinejoin="round"
-          />
-        </svg>
-      </button>
-      <span
-        className={cn(
-          "text-foreground min-w-[36px] text-center text-xs font-medium",
-          "dark:text-foreground",
-        )}
-      >
-        {value}%
-      </span>
-      <button
-        type="button"
-        onClick={handleZoomOut}
-        disabled={!canZoomOut}
-        className={cn(
-          "flex h-full w-10 items-center justify-center rounded transition-colors",
-          "text-muted-foreground hover:bg-muted hover:text-foreground",
-          "disabled:cursor-not-allowed disabled:opacity-40 disabled:hover:bg-transparent",
-          "dark:text-muted-foreground dark:hover:bg-muted dark:hover:text-foreground",
-        )}
-        aria-label={t.artifactPreview.zoomOut}
-      >
-        <svg
-          xmlns="http://www.w3.org/2000/svg"
-          width="16"
-          height="16"
-          viewBox="0 0 16 16"
-          fill="none"
-        >
-          <circle cx="7.55558" cy="7.55534" r="6.16667" stroke="#666666" />
-          <path
-            d="M13.8688 15.4646C14.064 15.6598 14.3806 15.6598 14.5759 15.4646C14.7711 15.2693 14.7711 14.9527 14.5759 14.7574L14.2223 15.111L13.8688 15.4646ZM14.2223 15.111L14.5759 14.7574L11.9092 12.0908L11.5557 12.4443L11.2021 12.7979L13.8688 15.4646L14.2223 15.111Z"
-            fill="#666666"
-          />
-          <path
-            d="M4.99927 7.5H9.99927"
-            stroke="#666666"
-            strokeLinecap="round"
-            strokeLinejoin="round"
-          />
-        </svg>
-      </button>
+        </DropdownMenuContent>
+      </DropdownMenu>
     </div>
   );
 };
diff --git a/frontend/src/components/workspace/artifacts/artifact-file-list.tsx b/frontend/src/components/workspace/artifacts/artifact-file-list.tsx
index fb9593b2..8b49a1de 100644
--- a/frontend/src/components/workspace/artifacts/artifact-file-list.tsx
+++ b/frontend/src/components/workspace/artifacts/artifact-file-list.tsx
@@ -150,7 +150,7 @@ export function ArtifactFileList({
               </CardHeader>
             </Card>
           </ContextMenuTrigger>
-          <ContextMenuContent className="min-w-[120px] p-1">
+          <ContextMenuContent className="min-w-[120px]">
             <ContextMenuItem
               onSelect={() => {
                 dispatchMentionReference({
diff --git a/frontend/src/components/workspace/messages/message-list-item.tsx b/frontend/src/components/workspace/messages/message-list-item.tsx
index 98cc5687..5e238c31 100644
--- a/frontend/src/components/workspace/messages/message-list-item.tsx
+++ b/frontend/src/components/workspace/messages/message-list-item.tsx
@@ -421,7 +421,7 @@ function RichFileCard({
             />
           </a>
         </ContextMenuTrigger>
-        <ContextMenuContent className="min-w-[120px] p-1">
+        <ContextMenuContent className="min-w-[120px]">
           <ContextMenuItem
             disabled={!canReference}
             onSelect={() => {
diff --git a/frontend/src/styles/globals.css b/frontend/src/styles/globals.css
index a84533af..f88d1f10 100644
--- a/frontend/src/styles/globals.css
+++ b/frontend/src/styles/globals.css
@@ -462,12 +462,12 @@ pre{
 
 /* 二三级标题 - 16px */
 [data-streamdown="heading-2"],
-[data-streamdown="heading-3"] {
+[data-streamdown="heading-3"],[data-streamdown="heading-4"] {
   font-size: calc(16px * var(--zoom-scale));
 }
 
 /* 代码块 - 14px */
-[data-streamdown="code-block"] pre {
+[data-streamdown="code-block"] pre,code {
   font-size: calc(14px * var(--zoom-scale));
 }
 
@@ -481,13 +481,19 @@ pre{
 
 [data-streamdown="table-cell"] {
   background-color: transparent;
+  font-size: calc(14px * var(--zoom-scale));
+  height:calc(42px * var(--zoom-scale)) ;
 }
 [data-streamdown="table-header"] {
   background: #9c9b9b26;
-  height: 50px;
+  height: calc(50px * var(--zoom-scale));
 }
 [data-streamdown="table-header"] th {
  text-align: center;
+  font-size: calc(14px * var(--zoom-scale));
+}
+[data-slot="hover-card-trigger"] [data-slot="badge"]{
+  font-size: calc(14px * var(--zoom-scale));
 }
 
 
@@ -500,7 +506,7 @@ pre{
   border-top-right-radius: 5px;
 }
 [data-streamdown="table-body"] tr:first-child td{
-  padding-top: 20px;
+  padding-top: calc(20px * var(--zoom-scale));
 }
 /* 行分隔线 */
 [data-streamdown="table-body"] tr{
@@ -515,14 +521,13 @@ pre{
 }
 
 [data-streamdown="table-body"] tr:last-child  {
-  height: 50px;
+  padding-top: calc(50px * var(--zoom-scale));
 
 }
 [data-streamdown="table-row"]  >[data-streamdown="table-cell"]{
 line-height: 14px;
 vertical-align: top;
   text-align: center;
-
 }