body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #0066cc; }
        h1 { font-size: 2.2em; border-bottom: 2px solid #ff9900; }
        h2 { font-size: 1.8em; margin-top: 30px; }
        h3 { font-size: 1.4em; color: #004d99; }
        .logo { font-size: 2.5em; font-weight: bold; color: #ff6600; text-shadow: 1px 1px 2px #000; }
        nav { background: #003366; padding: 15px; margin-bottom: 20px; }
        nav a { color: white; margin-right: 15px; text-decoration: none; }
        .mobile-nav-toggle { display: none; color: white; cursor: pointer; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .btn { display: inline-block; padding: 10px 20px; background: #ff6600; color: white; border-radius: 5px; margin: 10px 0; text-decoration: none; }
        .download-btn { background: #009933; }
        .login-btn { background: #0066cc; }
        footer { margin-top: 50px; padding: 20px; background: #f5f5f5; }
        @media (max-width: 768px) {
            .mobile-nav-toggle { display: block; }
            nav ul { display: none; }
            nav.active ul { display: block; }
        }