chore: adjust nav shadow

components/header.tsx

@@ -79,7 +79,7 @@ export default function Header() {
 
   return (
     <div className="pb-24">
-      <header className="w-full fixed top-0 left-0 right-0 bg-white/80 dark:bg-black/80 py-3 z-50 backdrop-blur-md border-b border-transparent dark:border-gray-800 transition-colors duration-300">
+      <header className="w-full fixed top-0 left-0 right-0 shadow bg-white/80 dark:bg-black/80 py-3 z-50 backdrop-blur-md border-b border-transparent dark:border-gray-800 transition-colors duration-300">
         <nav className="mx-auto max-w-7xl flex justify-between items-center px-4 md:px-6">
           <div className="flex items-center min-w-0">
             <Link href="/" className="truncate">
@@ -122,7 +122,7 @@ export default function Header() {
 
       {/* 移动端侧边菜单 */}
       <motion.div
-        className="md:hidden fixed top-[57px] right-0 bottom-0 w-full max-w-xs bg-white/80 dark:bg-black/80 backdrop-blur-md border-l border-gray-200 dark:border-gray-800 shadow-2xl z-40"
+        className="md:hidden fixed top-[57px] right-0 bottom-0 w-full max-w-xs bg-white/80 dark:bg-black/80 backdrop-blur-md border-l border-gray-200 dark:border-gray-800 z-40"
         initial="closed"
         animate={isMenuOpen ? "open" : "closed"}
         variants={sidebarVariants}