:root {
            --primary: #0067ff;
            --secondary: #00a844;
            --dark: #121212;
            --light: #f3f3f3;
            --white: #ffffff;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            margin: 0;
            line-height: 1.6;
            color: #333;
        }

        header {
            background: var(--dark);
            color: var(--white);
            padding: 1rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .nav-links {
            display: flex;
            gap: 20px;
            list-style: none;
        }

        .nav-links a {
            color: var(--white);
            text-decoration: none;
            font-weight: bold;
        }

        .hero {
            background: linear-gradient(135deg, #0067ff, #00a844);
            color: var(--white);
            padding: 100px 5%;
            text-align: center;
        }

        .container {
            max-width: 1200px;
            margin: auto;
            padding: 20px;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .card {
            border: 1px solid #ddd;
            padding: 20px;
            border-radius: 8px;
            text-align: center;
            background: #fff;
        }

        .card-img {
            height: 200px;
            background: #eee;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #888;
        }

        footer {
            background: var(--dark);
            color: var(--white);
            text-align: center;
            padding: 40px;
            margin-top: 40px;
        }

        @media (max-width: 768px) {
            header { flex-direction: column; }
            .nav-links { flex-direction: column; align-items: center; }
        }