/* --- GENEL AYARLAR --- */
        :root {
            --primary-color: #0b2046;
            --accent-color: #e63946;
            --text-dark: #333333;
            --text-light: #ffffff;
            --bg-light: #f8f9fa;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Montserrat', sans-serif;
        }

        body {
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--bg-light);
        }

        a { text-decoration: none; }

        /* --- ÜST BİLGİ VE MENÜ (SABİT) --- */
        .top-bar {
            background-color: var(--primary-color);
            color: var(--text-light);
            font-size: 0.85rem;
            padding: 8px 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-bar-left i, .top-bar-right i { margin-right: 5px; color: var(--accent-color); }
        .top-bar-right { display: flex; gap: 20px; }

        header {
            background-color: #ffffff;
            padding: 15px 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .logo { font-size: 1.8rem; font-weight: 700; color: var(--primary-color); }
        .logo span { color: var(--accent-color); }
        nav ul { list-style: none; display: flex; gap: 30px; }
        nav ul li a { color: var(--text-dark); font-weight: 500; transition: color 0.3s; }
        nav ul li a:hover, nav ul li a.active { color: var(--accent-color); }
        .btn-call {
            background-color: var(--accent-color);
            color: var(--text-light);
            padding: 10px 20px;
            border-radius: 5px;
            font-weight: 600;
        }

        /* --- SAYFA BAŞLIĞI (PAGE HEADER) --- */
        .page-header {
            background: linear-gradient(rgba(11, 32, 70, 0.8), rgba(11, 32, 70, 0.8)), 
                        url('https://images.unsplash.com/photo-1513694203232-719a280e022f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover;
            padding: 80px 5%;
            text-align: center;
            color: var(--text-light);
        }
        .page-header h1 { font-size: 2.5rem; margin-bottom: 10px; }
        .breadcrumb { font-size: 0.95rem; font-weight: 500; }
        .breadcrumb a { color: var(--text-light); transition: color 0.3s; }
        .breadcrumb a:hover { color: var(--accent-color); }

        /* --- ÜRÜN DETAY ALANI --- */
        .product-detail-section {
            padding: 60px 5%;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            background-color: #ffffff;
        }

        /* Sol: Görsel */
        .product-gallery {
            width: 100%;
        }
        .main-image {
            width: 100%;
            height: 450px;
            object-fit: cover;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            margin-bottom: 20px;
        }

        /* Sağ: Teknik Detaylar */
        .product-info h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .product-info h2 span { color: var(--accent-color); }
        .product-info p.lead {
            font-size: 1.1rem;
            color: #555;
            margin-bottom: 25px;
        }

        .warranty-box {
            background-color: rgba(11, 32, 70, 0.05);
            border-left: 4px solid var(--primary-color);
            padding: 15px 20px;
            margin-bottom: 30px;
            border-radius: 0 5px 5px 0;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        .warranty-box i { font-size: 1.8rem; color: var(--primary-color); }
        .warranty-box span { font-weight: 600; color: var(--text-dark); }

        .specs-list {
            list-style: none;
            margin-bottom: 40px;
        }
        .specs-list li {
            padding: 10px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: center;
            color: #444;
            font-weight: 500;
        }
        .specs-list li i {
            color: var(--accent-color);
            margin-right: 15px;
            font-size: 1.2rem;
        }

        /* Aksiyon Butonları */
        .action-buttons {
            display: flex;
            gap: 15px;
        }
        .btn-quote {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 15px 30px;
            border-radius: 5px;
            font-weight: 600;
            transition: all 0.3s;
            flex: 1;
            text-align: center;
        }
        .btn-quote:hover {
            background-color: var(--accent-color);
        }
        .btn-whatsapp {
            background-color: #25d366;
            color: var(--text-light);
            padding: 15px 30px;
            border-radius: 5px;
            font-weight: 600;
            transition: all 0.3s;
            flex: 1;
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-whatsapp:hover {
            background-color: #1ebc5a;
        }

        /* --- DETAYLI AÇIKLAMA ALANI (ALT KISIM) --- */
        .product-description-section {
            padding: 60px 5%;
            background-color: var(--bg-light);
        }
        .content-box {
            background-color: #ffffff;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
            max-width: 1000px;
            margin: 0 auto;
        }
        .content-box h3 {
            color: var(--primary-color);
            margin-bottom: 20px;
            font-size: 1.5rem;
            border-bottom: 2px solid var(--accent-color);
            display: inline-block;
            padding-bottom: 5px;
        }
        .content-box p {
            margin-bottom: 20px;
            color: #555;
            line-height: 1.8;
        }
        .content-box ul {
            list-style: disc;
            margin-left: 20px;
            margin-bottom: 30px;
            color: #555;
        }
        .content-box ul li { margin-bottom: 8px; }

        /* --- FOOTER VE MOBİL (SABİT) --- */
        footer {
            background-color: #051024;
            color: #b0b7c3;
            padding: 70px 5% 20px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 50px; }
        .footer-logo { font-size: 1.8rem; font-weight: 700; color: var(--text-light); margin-bottom: 20px; display: block; }
        .footer-logo span { color: var(--accent-color); }
        .footer-title { color: var(--text-light); font-size: 1.2rem; margin-bottom: 20px; font-weight: 600; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: #b0b7c3; transition: color 0.3s; }
        .footer-links a:hover { color: var(--text-light); }
        .footer-contact li { display: flex; margin-bottom: 15px; }
        .footer-contact i { color: var(--accent-color); margin-top: 5px; margin-right: 15px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.9rem; }

        .whatsapp-btn {
            position: fixed; bottom: 30px; right: 30px;
            background-color: #25d366; color: white; width: 60px; height: 60px;
            border-radius: 50%; display: flex; justify-content: center; align-items: center;
            font-size: 35px; box-shadow: 0 4px 15px rgba(0,0,0,0.2); z-index: 9999;
        }

        @media (max-width: 992px) {
            .product-detail-section { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .top-bar { flex-direction: column; text-align: center; gap: 10px; }
            nav ul { display: none; }
            .action-buttons { flex-direction: column; }
            .footer-grid { grid-template-columns: 1fr; }
        }