 <style>
        /* Modern Header Layout */
        .header-main {
            padding: 15px 0;
            background: linear-gradient(135deg, #3f51b5 0%, #009688 100%);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        .header-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
        }
        
        /* Modern Logo */
        .logo-container {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }
        
        .logo-icon {
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.25);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 18px;
            backdrop-filter: blur(5px);
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 800;
            color: white;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        
        /* Modern Arama Kutusu */
        .search-container {
            flex: 1;
            max-width: 600px;
        }
        
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 12px;
            padding: 4px;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }
        
        .search-box:focus-within {
            border-color: rgba(255, 255, 255, 0.8);
            background: white;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
        }
        
        .search-box input {
            flex: 1;
            padding: 14px 20px;
            border: none;
            background: transparent;
            font-size: 15px;
            outline: none;
            color: #333;
        }
        
        .search-btn {
            background: linear-gradient(135deg, #3f51b5, #009688);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 10px;
            cursor: pointer;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: transform 0.2s, opacity 0.2s;
        }
        
        .search-btn:hover {
            transform: translateY(-1px);
            opacity: 0.95;
        }
        
        /* Modern Header Actions */
        .header-actions {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        
        .action-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-decoration: none;
            color: rgba(255, 255, 255, 0.9);
            font-size: 12px;
            transition: all 0.3s ease;
            position: relative;
            padding: 8px 12px;
            border-radius: 8px;
        }
        
        .action-item:hover {
            color: white;
            background: rgba(255, 255, 255, 0.15);
        }
        
        .action-item i {
            font-size: 22px;
            margin-bottom: 4px;
            color: white !important;
        }
        
        .badge {
            position: absolute;
            top: -5px;
            right: 0;
            background: #ff5252;
            color: white;
            font-size: 10px;
            font-weight: 600;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        /* Menü Bar (Farklı Renk) */
        .menu-bar {
            background: linear-gradient(135deg, #3949ab 0%, #00897b 100%);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .menu-container {
            display: flex;
            align-items: center;
            position: relative;
        }
        
        /* Desktop Menü Öğeleri (Sadece Ana Kategoriler) */
        .desktop-menu {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            width: 100%;
        }
        
        .desktop-menu > li {
            position: relative;
            flex: 1;
        }
        
        .desktop-menu > li > a {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 18px 15px;
            transition: all 0.3s;
            text-align: center;
            white-space: nowrap;
        }
        
        .desktop-menu > li > a:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        
        .desktop-menu > li > a i {
            font-size: 18px;
            color: white;
        }
        
        /* Ana Kategori Alt Menüsü (Aşağı Açılan) */
        .desktop-submenu {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: white;
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
            border-radius: 0 0 12px 12px;
            display: none;
            z-index: 1000;
            padding: 25px;
        }
        
        .desktop-menu > li:hover > .desktop-submenu {
            display: block;
        }
        
        /* Alt Kategori Grid */
        .desktop-submenu-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 20px;
        }
        
        /* Alt Kategori Kolonu */
        .desktop-submenu-column {
            display: flex;
            flex-direction: column;
        }
        
        /* Alt Kategori Başlığı */
        .desktop-subcategory-header {
            padding: 10px 0;
            margin-bottom: 15px;
            border-bottom: 2px solid #3f51b5;
            font-weight: 700;
            color: #333;
            font-size: 16px;
        }
        
        /* Alt Kategori Öğeleri */
        .desktop-subcategory-item {
            margin-bottom: 12px;
        }
        
        .desktop-subcategory-link {
            display: block;
            padding: 8px 0;
            color: #555;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s;
        }
        
        .desktop-subcategory-link:hover {
            color: #3f51b5;
            padding-left: 10px;
        }
        
        /* 3. Seviye Alt Kategoriler */
        .desktop-third-level {
            margin-top: 8px;
            padding-left: 15px;
            border-left: 2px solid #e0e0e0;
        }
        
        .desktop-third-level-item {
            margin-bottom: 6px;
        }
        
        .desktop-third-level-link {
            display: block;
            padding: 5px 0;
            color: #777;
            text-decoration: none;
            font-size: 13px;
            transition: all 0.2s;
        }
        
        .desktop-third-level-link:hover {
            color: #009688;
            padding-left: 8px;
        }
        
        /* Tümünü Gör Linki */
        .desktop-view-all {
            display: inline-block;
            margin-top: 15px;
            padding: 8px 15px;
            background: #f8f9fa;
            color: #3f51b5;
            text-decoration: none;
            font-size: 13px;
            font-weight: 600;
            border-radius: 6px;
            transition: all 0.2s;
        }
        
        .desktop-view-all:hover {
            background: #3f51b5;
            color: white;
        }
        
        /* Mobil Butonlar */
        .mobile-menu-btn, .mobile-search-btn {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            border-radius: 8px;
            transition: background 0.3s;
        }
        
        .mobile-menu-btn:hover, .mobile-search-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        
        .mobile-menu-btn i, .mobile-search-btn i {
            font-size: 24px;
            color: white;
        }
        
        /* Mobil Arama */
        .mobile-search-container {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: white;
            padding: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            z-index: 1000;
            border-radius: 0 0 12px 12px;
        }
        
        .mobile-search-container.active {
            display: block;
        }
        
        .mobile-search-box {
            display: flex;
            background: #f8f9fa;
            border-radius: 12px;
            overflow: hidden;
        }
        
        .mobile-search-box input {
            flex: 1;
            padding: 16px 20px;
            border: none;
            background: transparent;
            font-size: 16px;
            outline: none;
        }
        
        .mobile-search-box button {
            background: linear-gradient(135deg, #3f51b5, #009688);
            color: white;
            border: none;
            padding: 0 24px;
            cursor: pointer;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        /* Responsive */
        @media (max-width: 1200px) {
            .desktop-submenu-grid {
                grid-template-columns: repeat(4, 1fr);
            }
            
            .desktop-menu > li > a {
                padding: 18px 10px;
                font-size: 14px;
            }
        }
        
        @media (max-width: 992px) {
            .header-wrapper {
                flex-wrap: wrap;
                gap: 15px;
            }
            
            .mobile-menu-btn {
                display: block;
                order: 1;
            }
            
            .logo-container {
                order: 2;
                flex: 1;
            }
            
            .header-actions {
                order: 3;
            }
            
            .mobile-search-btn {
                display: block;
                order: 4;
            }
            
            .search-container {
                display: none !important;
            }
            
            .menu-bar {
                display: none;
            }
            
            .desktop-submenu {
                position: static;
                width: 100%;
                box-shadow: none;
                padding: 15px;
            }
            
            .desktop-submenu-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .desktop-submenu-grid {
                grid-template-columns: 1fr;
            }
        }
        
        /* Modal CSS */
        .auth-modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 10000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(3px);
        }

        .auth-modal {
            background: #fff;
            width: 400px;
            max-width: 90%;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
            position: relative;
            animation: slideDown 0.3s ease;
        }

        @keyframes slideDown {
            from { transform: translateY(-20px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }

        .close-modal {
            position: absolute;
            top: 15px;
            right: 15px;
            background: none;
            border: none;
            font-size: 20px;
            color: #888;
            cursor: pointer;
            z-index: 10;
        }

        .auth-tabs {
            display: flex;
            border-bottom: 1px solid #eee;
        }

        .auth-tab-btn {
            flex: 1;
            padding: 15px;
            background: #f9f9f9;
            border: none;
            font-weight: 600;
            color: #666;
            cursor: pointer;
            transition: 0.3s;
        }

        .auth-tab-btn.active {
            background: #fff;
            color: #3f51b5;
            border-bottom: 2px solid #3f51b5;
        }

        .auth-content {
            padding: 30px;
        }

        .auth-form {
            display: none;
        }

        .auth-form.active {
            display: block;
        }

        .form-group {
            margin-bottom: 15px;
        }

        .form-group label {
            display: block;
            margin-bottom: 5px;
            font-size: 13px;
            color: #555;
            font-weight: 600;
        }

        .form-input {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 14px;
        }

        .form-input:focus {
            border-color: #3f51b5;
            outline: none;
        }

        .auth-btn {
            width: 100%;
            padding: 12px;
            background: linear-gradient(90deg, #3f51b5, #009688);
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.2s;
        }

        .auth-btn:hover {
            opacity: 0.9;
        }

        .terms-check {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 12px;
            color: #666;
            margin-bottom: 20px;
        }

        .terms-check input {
            margin-top: 3px;
        }

        .auth-footer {
            text-align: center;
            font-size: 12px;
            color: #888;
            margin-top: 15px;
            padding: 15px;
            border-top: 1px solid #eee;
        }

        .auth-footer a {
            color: #3f51b5;
            text-decoration: none;
        }
        
        /* Mobil Menü */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: white;
            z-index: 10000;
            overflow-y: auto;
            padding: 20px;
        }
        
        .mobile-nav.active {
            display: block;
            animation: slideInRight 0.3s ease;
        }
        
        @keyframes slideInRight {
            from { transform: translateX(100%); }
            to { transform: translateX(0); }
        }
        
        .mobile-nav-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .close-mobile-menu {
            background: none;
            border: none;
            font-size: 24px;
            color: #666;
            cursor: pointer;
            padding: 5px;
        }
        
        .mobile-category-item {
            margin-bottom: 10px;
            border-bottom: 1px solid #f5f5f5;
        }
        
        .mobile-category-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            color: #333;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
        }
        
        .mobile-subcategories {
            display: none;
            padding-left: 20px;
            margin-bottom: 15px;
        }
        
        .mobile-subcategories.active {
            display: block;
        }
        
        .mobile-subcategory-link {
            display: block;
            padding: 12px 0;
            color: #666;
            text-decoration: none;
            border-bottom: 1px dashed #eee;
        }
        
        .mobile-subcategory-link:last-child {
            border-bottom: none;
        }
        
        .mobile-menu-arrow {
            transition: transform 0.3s;
            color: #666;
        }
        
        .mobile-category-item.active .mobile-menu-arrow {
            transform: rotate(180deg);
            color: #3f51b5;
        }
        
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 9999;
        }
        
        .mobile-overlay.active {
            display: block;
        }
    </style>