:root {
            --primary-bg: #000624;
            --accent-color: #0b43b4;
            --text-main: #212121;
            --white: #ffffff;
            --gray: #f4f4f4;
        }
        body { margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--text-main); }
        header { background: var(--primary-bg); color: var(--white); padding: 2rem; text-align: center; }
        nav { display: flex; flex-wrap: wrap; justify-content: center; background: #eee; padding: 1rem; border-bottom: 3px solid var(--accent-color); }
        nav a { margin: 0.5rem 1rem; color: var(--primary-bg); font-weight: bold; font-size: 0.9rem; text-decoration: none; }
        nav a:hover { color: var(--accent-color); }
        .hero { height: 400px; display: flex; align-items: center; justify-content: center; background: #162d3d; color: white; text-align: center; padding: 2rem; }
        .container { max-width: 1000px; margin: 2rem auto; padding: 0 1rem; }
        .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 2rem; }
        .card { border: 1px solid #ddd; padding: 1rem; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
        .card .img-placeholder { width: 100%; height: 200px; background: linear-gradient(45deg, #000624, #0b43b4); margin-bottom: 1rem; border-radius: 4px; }
        footer { text-align: center; padding: 3rem; background: #000; color: white; margin-top: 3rem; }
        @media (max-width: 768px) { nav { flex-direction: column; align-items: center; } }