<div class="fixed w-full z-50 transition-all duration-500" id="header">
<div class="relative" id="headerBackground">
<div class="max-w-7xl mx-auto px-4">
<div class="flex justify-between items-center h-20">
<!-- Logo -->
<div class="relative flex items-center">
<div class="relative z-10 flex items-center">
<div class="flex h-12 w-12 items-center justify-center rounded-xl bg-gradient-to-br from-purple-600 to-blue-600 shadow-lg">
<i data-lucide="zap" class="h-7 w-7 text-white"></i>
</div>
<div class="ml-3">
<span class="text-2xl font-bold bg-gradient-to-r from-purple-600 to-blue-600 bg-clip-text text-transparent">Domain</span>
<span class="text-2xl font-bold text-gray-900">Sepeti</span>
</div>
</div>
<div class="absolute -inset-1 rounded-xl bg-gradient-to-br from-purple-600 to-blue-600 opacity-20 blur-xl"></div>
</div>
<!-- Mobile Menu Button -->
<button class="lg:hidden mobile-menu-button" onclick="toggleMobileMenu()">
<i data-lucide="menu" class="h-6 w-6" id="menuIcon"></i>
</button>
<!-- Navigation -->
<nav id="mainNav">
<a href="index.php">Ana Sayfa</a>
<div class="menu-item">
<a href="#" onclick="toggleSubmenu(this)">Menü</a>
<div class="submenu">
<a href="domain_sorgula.php">Domain Sorgulama</a>
<a href="haberler.php">Haber & Blog</a>
<a href="guestbook.php">Ziyaretci Defteri</a>
<a href="topludomainekle.php">Toplu D. Ekle</a>
<a href="destekol.php">Destek & Sponsorluk</a>
<a href="uyeliksartlar.php">Üyelik Sözleşmesi</a>
<a href="sartlar.php">D. Ekleme Kuralları</a>
<a href="bildir.php">İçerik Bildirim</a>
<a href="contact.php">İletişim</a>
</div>
</div>
<a href="bosdomain.php">Serbest Domainler</a>
<a href="javascript<b></b>:void(0)" onclick="openModal()">Domain Ekle</a>
<?php endif; ?>
<div class="menu-item">
<a href="#"><?php echo isset($_SESSION['user_id']) ? 'Hesabım' : 'Üyelik'; ?></a>
<div class="submenu">
<?php if(isset($_SESSION['user_id'])): ?>
<a href="profile.php">Profil</a>
<a href="logout.php">Çıkış Yap</a>
<?php else: ?>
<a href="login_form.php">Giriş Yap</a>
<?php endif; ?>
</div>
</div>
<a href="register.php" class="cta-button">Hemen Katıl</a>
</nav>
</div>
</div>
</div>
</div>383 den başlayıp 449 satırda biten alan header alanı değil mi? eğer header kastınız navigation menu alanıysa