diff --git a/.agent/skills/ui_standards/SKILL.md b/.agent/skills/ui_standards/SKILL.md
new file mode 100644
index 0000000..cf34371
--- /dev/null
+++ b/.agent/skills/ui_standards/SKILL.md
@@ -0,0 +1,40 @@
+---
+name: UI Design Standards
+description: Rules and guidelines for consistent UI components including dropdowns, popovers, and list items.
+---
+
+# UI Design Standards
+
+This skill provides guidelines for building consistent, accessible, and high-quality UI components within the codebase.
+
+## 1. Popovers and Dropdowns (弹窗与下拉规范)
+
+### Alignment (定位逻辑)
+- **Right Edge Alignment**: For triggers located on the right side of the screen or navigation bar, the associated dropdown/popover MUST be right-aligned with the trigger.
+  - In Radix UI / shadcn: Use `align="end"`.
+  - In CSS/Tailwind: Use `absolute right-0`.
+- **Vertical Spacing**: Maintain a consistent vertical offset from the trigger, typically `8px` (`mt-2` or `sideOffset={8}`).
+
+### Layering and Visual Hierarchy (层级管理)
+- **Z-Index**: Always explicitly declare a `z-index` of `50` or higher for floating UI elements to ensure they appear above all other content.
+- **Background Integrity**: Drodown containers should use opaque background colors (e.g., `bg-white` or theme-defined `bg-surface`) to prevent "see-through" visual noise from underlying content. Avoid excessive transparency/blur if it compromises readability.
+- **Shadows**: Use distinct shadows (e.g., `shadow-md` or `shadow-xl`) to provide depth.
+
+### Clipping Prevention (溢出处理)
+- Use Portals (e.g., `DropdownMenu.Portal`) to render floating content into the `document.body`. This prevents the menu from being clipped by parents with `overflow: hidden`.
+
+## 2. List Items and Components (列表项规范)
+
+### Layout and Alignment (对齐规范)
+- **Flexbox**: Use `flex items-center` for all list items that include both an icon and a text label.
+- **Icon Spacing**: Maintain a standard horizontal gap between icons and labels (recommended: `gap-3` or `12px`).
+
+### Component Integrity (防压缩与自适应)
+- **Icon Shrinking**: Icons within flex containers MUST have `flex-shrink: 0` (Tailwind: `shrink-0`) to prevent them from distorting when the container is narrow.
+- **Minimum Width**: Containers displaying variable-length text (like user emails) should have a reasonable `min-width` (e.g., `min-w-[200px]`) to ensure comfortable display.
+
+## 3. Interaction and Accessibility
+
+- **Keyboard Support**: Ensure dropdowns support `Esc` to close and allow keyboard navigation (Tab/Arrows).
+- **Outside Clicks**: Implement "click outside to close" logic for all popovers.
+- **Motion**: Use subtle entry/exit animations (e.g., 120ms fade and scale). Respect `prefers-reduced-motion`.
diff --git a/.cursorrules b/.cursorrules
new file mode 100644
index 0000000..e329023
--- /dev/null
+++ b/.cursorrules
@@ -0,0 +1,12 @@
+# UI Development Rules
+
+## 1. 弹窗与下拉规范 (Popovers & Dropdowns)
+- **定位逻辑**：除非特殊说明，右上角的触发器对应的弹出层必须强制 `right-0` (或 `align="end"`) 对齐。
+- **层级管理**：所有 Floating UI 必须显式声明 `z-[50+]` 以防被 Content Card 遮挡或透视。
+- **背景显示**：下拉容器背景应使用不透明色（如 `bg-white` 或主题定义的 `bg-surface`），避免透明度导致的视觉干扰。
+
+## 2. 列表项规范 (List Items)
+- **对齐**：所有带有图标的列表项必须使用 `flex items-center`。
+- **防止重叠**：图标与文字之间应保持足够的间距（推荐 `gap-3` 或 `12px`）。
+- **防压缩**：图标必须带有 `flex-shrink: 0` (或 Tailwind 的 `shrink-0`)，防止在容器宽度不足时图标变形。
+- **最小宽度**：涉及用户信息的容器应设置合理的 `min-width` (如 `min-w-[200px]`) 以保证长文字内容正常显示。
diff --git a/src/components/UnifiedNavigation.tsx b/src/components/UnifiedNavigation.tsx
index 104aad2..0bc7561 100644
--- a/src/components/UnifiedNavigation.tsx
+++ b/src/components/UnifiedNavigation.tsx
@@ -275,7 +275,7 @@ export default function UnifiedNavigation() {
 
             <div className="hidden flex-1 items-center justify-end gap-3 lg:flex">
               {user ? (
-                <div className="flex items-center gap-2">
+                <div className="flex items-center gap-3 relative">
                   <DropdownMenu.Root open={accountMenuOpen} onOpenChange={setAccountMenuOpen}>
                     <DropdownMenu.Trigger asChild>
                       <button
@@ -291,7 +291,7 @@ export default function UnifiedNavigation() {
                       <DropdownMenu.Content
                         align="end"
                         sideOffset={8}
-                        className="z-50 min-w-[220px] overflow-hidden rounded-[12px] border border-surface-border bg-surface/95 p-1 shadow-shadow-md backdrop-blur-sm animate-in fade-in zoom-in-95 duration-[120ms] data-[state=closed]:animate-out data-[state=closed]:fade-out data-[state=closed]:zoom-out-95 motion-reduce:animate-none"
+                        className="z-50 min-w-[220px] overflow-hidden rounded-[12px] border border-surface-border bg-surface p-1 shadow-shadow-md animate-in fade-in zoom-in-95 duration-[120ms] data-[state=closed]:animate-out data-[state=closed]:fade-out data-[state=closed]:zoom-out-95 motion-reduce:animate-none"
                       >
                         <div className="px-4 py-3 border-b border-surface-border/50 mb-1">
                           <p className="text-sm font-semibold text-text leading-none mb-1.5">
@@ -311,14 +311,14 @@ export default function UnifiedNavigation() {
                             >
                               <Link
                                 href={item.href}
-                                className={`flex h-[38px] items-center gap-2.5 px-3 rounded-lg text-[13px] font-medium transition-all group select-none ${item.key === 'logout'
+                                className={`flex h-[38px] items-center gap-3 px-3 rounded-lg text-[13px] font-medium transition-all group select-none ${item.key === 'logout'
                                   ? "text-rose-500 hover:bg-rose-500/10 hover:text-rose-600 focus:bg-rose-500/10 focus:text-rose-600"
                                   : "text-text-muted hover:bg-primary/10 hover:text-primary focus:bg-primary/10 focus:text-primary"
                                   }`}
                                 onClick={() => setAccountMenuOpen(false)}
                               >
                                 {item.icon && (
-                                  <item.icon className={`w-4 h-4 opacity-70 group-hover:opacity-100 transition-opacity ${item.key === 'logout' ? 'text-rose-500' : 'text-current'}`} />
+                                  <item.icon className={`w-4 h-4 shrink-0 opacity-70 group-hover:opacity-100 transition-opacity ${item.key === 'logout' ? 'text-rose-500' : 'text-current'}`} />
                                 )}
                                 <span>
                                   {typeof item.label === "function"
@@ -332,33 +332,41 @@ export default function UnifiedNavigation() {
                       </DropdownMenu.Content>
                     </DropdownMenu.Portal>
                   </DropdownMenu.Root>
+                  <LanguageToggle />
+                  <ReleaseChannelSelector
+                    selected={selectedChannels}
+                    onToggle={toggleChannel}
+                    variant="icon"
+                  />
                 </div>
               ) : (
-                <div className="flex items-center gap-3 text-sm font-medium text-text-muted">
-                  <Link
-                    href="/login"
-                    className="text-sm opacity-80 transition hover:text-primary hover:opacity-100"
-                  >
-                    {nav.account.login}
-                  </Link>
-                  <span
-                    className="h-3 w-px bg-surface-border"
-                    aria-hidden="true"
+                <>
+                  <div className="flex items-center gap-3 text-sm font-medium text-text-muted">
+                    <Link
+                      href="/login"
+                      className="text-sm opacity-80 transition hover:text-primary hover:opacity-100"
+                    >
+                      {nav.account.login}
+                    </Link>
+                    <span
+                      className="h-3 w-px bg-surface-border"
+                      aria-hidden="true"
+                    />
+                    <Link
+                      href="/register"
+                      className="rounded-md border border-surface-border px-3 py-1 text-primary transition hover:border-primary/40 hover:bg-surface-muted"
+                    >
+                      {nav.account.register}
+                    </Link>
+                  </div>
+                  <LanguageToggle />
+                  <ReleaseChannelSelector
+                    selected={selectedChannels}
+                    onToggle={toggleChannel}
+                    variant="icon"
                   />
-                  <Link
-                    href="/register"
-                    className="rounded-md border border-surface-border px-3 py-1 text-primary transition hover:border-primary/40 hover:bg-surface-muted"
-                  >
-                    {nav.account.register}
-                  </Link>
-                </div>
+                </>
               )}
-              <LanguageToggle />
-              <ReleaseChannelSelector
-                selected={selectedChannels}
-                onToggle={toggleChannel}
-                variant="icon"
-              />
             </div>
           </div>
         </div>