导航组件

<nav class="bg-blue-600 dark:bg-gray-900 shadow-md">
  <div class="container mx-auto px-4 py-3 flex items-center justify-between">
    <!-- Logo/Brand Name -->
    <a href="#" class="text-white dark:text-orange-300 text-2xl font-bold tracking-wide hover:text-orange-200 dark:hover:text-white transition duration-300">
      EduHub
    </a>

    <!-- Mobile Menu Button (Hamburger) -->
    <div class="md:hidden">
      <button class="text-white dark:text-gray-300 focus:outline-none focus:ring-2 focus:ring-orange-300 dark:focus:ring-blue-500 rounded-md p-2">
        <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="M4 6h16M4 12h16m-7 6h7"></path>
        </svg>
      </button>
    </div>

    <!-- Desktop Navigation Links -->
    <div class="hidden md:flex space-x-6 lg:space-x-8 items-center">
      <a href="#" class="text-white dark:text-gray-300 text-lg font-medium hover:text-orange-200 dark:hover:text-blue-500 transition duration-300">
        Courses
      </a>
      <a href="#" class="text-white dark:text-gray-300 text-lg font-medium hover:text-orange-200 dark:hover:text-blue-500 transition duration-300">
        Programs
      </a>
      <a href="#" class="text-white dark:text-gray-300 text-lg font-medium hover:text-orange-200 dark:hover:text-blue-500 transition duration-300">
        About Us
      </a>
      <a href="#" class="text-white dark:text-gray-300 text-lg font-medium hover:text-orange-200 dark:hover:text-blue-500 transition duration-300">
        Contact
      </a>
      <button class="bg-orange-500 dark:bg-emerald-500 text-white dark:text-gray-900 px-6 py-2 rounded-full font-semibold hover:bg-orange-600 dark:hover:bg-emerald-600 transition duration-300 shadow-md">
        Sign Up
      </button>
    </div>

  </div>

  <!-- Mobile Menu (hidden by default, shown via JS toggle if needed) -->
  <!-- For this pure HTML/Tailwind component, we can use a utility class to demonstrate the concept, 
       but a real implementation would require toggle class using JS. -->
  <div class="md:hidden bg-blue-700 dark:bg-gray-800 pb-3 hidden" id="mobile-menu">
    <div class="px-2 pt-2 pb-3 space-y-1">
      <a href="#" class="block px-3 py-2 rounded-md text-base font-medium text-white dark:text-gray-300 hover:bg-blue-600 dark:hover:bg-gray-700 hover:text-orange-100 dark:hover:text-blue-400 transition duration-300">
        Courses
      </a>
      <a href="#" class="block px-3 py-2 rounded-md text-base font-medium text-white dark:text-gray-300 hover:bg-blue-600 dark:hover:bg-gray-700 hover:text-orange-100 dark:hover:text-blue-400 transition duration-300">
        Programs
      </a>
      <a href="#" class="block px-3 py-2 rounded-md text-base font-medium text-white dark:text-gray-300 hover:bg-blue-600 dark:hover:bg-gray-700 hover:text-orange-100 dark:hover:text-blue-400 transition duration-300">
        About Us
      </a>
      <a href="#" class="block px-3 py-2 rounded-md text-base font-medium text-white dark:text-gray-300 hover:bg-blue-600 dark:hover:bg-gray-700 hover:text-orange-100 dark:hover:text-blue-400 transition duration-300">
        Contact
      </a>
      <button class="block w-full text-left px-3 py-2 mt-2 rounded-md text-base font-semibold text-white dark:text-gray-900 bg-orange-500 dark:bg-emerald-500 hover:bg-orange-600 dark:hover:bg-emerald-600 transition duration-300 shadow-sm">
        Sign Up
      </button>
    </div>
  </div>
</nav>