:root { --primary: #122b40; --secondary: #1c94c4; --text: #262626; --bg-light: #f9f9f9; }
        body { font-family: Arial, sans-serif; color: var(--text); margin: 0; background: url('/assets/main_bg.jpg') fixed; }
        header { background: #fff; border-bottom: 2px solid var(--primary); padding: 1rem 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
        .logo { max-width: 200px; display: block; margin: 0 auto; }
        nav ul { display: flex; list-style: none; padding: 0; gap: 20px; justify-content: center; }
        nav a { text-decoration: none; color: var(--primary); font-weight: bold; }
        .hero-placeholder { width: 100%; height: 400px; background: linear-gradient(45deg, #122b40, #286090); display: flex; align-items: center; justify-content: center; color: white; font-size: 2rem; margin-bottom: 2rem; }
        .product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; padding: 2rem 0; }
        .item-card { border: 1px solid #ddd; background: #fff; padding: 1rem; text-align: center; border-radius: 8px; }
        .item-image-placeholder { width: 100%; height: 200px; background: #eee; margin-bottom: 10px; display: flex; align-items: center; justify-content: center; color: #aaa; }
        footer { background: var(--primary); color: white; text-align: center; padding: 2rem; margin-top: 2rem; }
        @media (max-width: 768px) { nav ul { flex-direction: column; align-items: center; } }