R67 A1-A6：官网风格前端 UI 刷新

client/src/components/navigation/Sidebar.tsx

@@ -3,16 +3,19 @@ import { NavLinks } from "./NavLinks";
 
 export function Sidebar() {
   return (
-    <aside className="fixed inset-y-0 z-20 hidden w-72 overflow-hidden border-r border-zinc-200 bg-white/95 backdrop-blur lg:flex lg:flex-col">
-      <div className="border-b border-zinc-200 px-6 py-6">
+    <aside className="fixed inset-y-0 z-20 hidden w-72 overflow-hidden border-r border-slate-200 bg-white/92 shadow-[18px_0_50px_rgba(15,23,42,0.08)] backdrop-blur-xl lg:flex lg:flex-col">
+      <div className="border-b border-slate-200 px-6 py-6">
         <AppBrand />
-        <div className="mt-4 rounded-2xl border border-zinc-200 bg-zinc-50 px-4 py-3 text-sm text-zinc-600">
-          <div className="font-medium text-zinc-900">统一工作台</div>
-          <div className="mt-1">先看今天要做什么，再进入具体模块处理。</div>
+        <div className="mt-5 overflow-hidden rounded-3xl border border-slate-200 bg-[linear-gradient(135deg,rgba(0,57,138,0.08),rgba(19,168,184,0.10))] px-4 py-4 text-sm text-[var(--color-text-secondary)]">
+          <div className="flex items-center gap-2 font-semibold text-[var(--color-text-primary)]">
+            <span className="size-2 rounded-full bg-primary" />
+            今日工作台
+          </div>
+          <div className="mt-2 leading-6">先处理待办和团队状态，再进入具体模块。</div>
         </div>
       </div>
 
-      <div className="min-h-0 flex-1 overflow-y-auto px-4 py-5">
+      <div className="min-h-0 flex-1 overflow-y-auto px-4 py-5 [scrollbar-width:thin]">
         <NavLinks />
       </div>
     </aside>