粘滞导航组件

<header class="sticky top-0 z-50 bg-emerald-100/90 backdrop-blur-sm shadow-sm dark:bg-emerald-950/90 dark:shadow-lg transition-colors duration-300">
  <nav class="container mx-auto px-4 py-3 flex items-center justify-between">
    <div class="flex items-center space-x-8">
      <a href="#" class="flex items-center group">
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        <span class="ml-2 text-2xl font-bold tracking-tight text-emerald-800 dark:text-emerald-100 group-hover:text-emerald-600 dark:group-hover:text-emerald-200 transition-colors duration-200">MarketPulse</span>
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            Products
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            Categories
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        <li>
          <a href="#" class="text-emerald-700 dark:text-emerald-200 text-lg font-medium hover:text-emerald-900 dark:hover:text-emerald-50 transition-colors duration-200 relative group">
            Vendors
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    <div class="flex items-center space-x-4">
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        <svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 3h2l.4 2M7 13h10l4-8H5.4M7 13L5.4 5M7 13H4m0 0l2 2m-2-2a2 2 0 100 4 2 2 0 000-4zM17 13h-4m4 0l-2 2m2-2a2 2 0 100 4 2 2 0 000-4z"></path>
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      <button class="p-2 rounded-full hidden md:block bg-emerald-200 dark:bg-emerald-800 text-emerald-700 dark:text-emerald-200 hover:bg-emerald-300 dark:hover:bg-emerald-700 transition-all duration-200 ease-linear transform hover:scale-105" aria-label="User Profile">
        <img src="https://randomuser.me/api/portraits/men/32.jpg" alt="User avatar" class="h-7 w-7 rounded-full object-cover border border-emerald-300 dark:border-emerald-700">
      </button>
      <div class="flex items-center space-x-2">
        <button id="dark-mode-toggle" aria-label="Toggle dark mode" class="p-2 rounded-full bg-emerald-200 dark:bg-emerald-800 text-emerald-700 dark:text-emerald-200 hover:bg-emerald-300 dark:hover:bg-emerald-700 transition-all duration-200 ease-linear transform hover:scale-105">
          <svg class="h-6 w-6 hidden dark:block" fill="currentColor" viewBox="0 0 20 20">
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          <svg class="h-6 w-6 dark:hidden" fill="currentColor" viewBox="0 0 20 20">
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      <button class="md:hidden p-2 rounded-full bg-emerald-200 dark:bg-emerald-800 text-emerald-700 dark:text-emerald-200 hover:bg-emerald-300 dark:hover:bg-emerald-700 transition-all duration-200 ease-linear transform hover:scale-105" aria-label="Open menu">
        <svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
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  </nav>
</header>

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