body { font-family: 'Arial', sans-serif; line-height: 1.6; max-width: 1200px; margin: 0 auto; padding: 20px; color: #333; }
        h1 { color: #e74c3c; text-align: center; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #27ae60; }
        .logo { font-size: 28px; font-weight: bold; color: #e74c3c; text-align: center; margin: 20px 0; }
        nav { background: #f8f9fa; padding: 15px; text-align: center; position: sticky; top: 0; }
        nav a { margin: 0 15px; text-decoration: none; color: #2980b9; font-weight: bold; }
        .mobile-menu { display: none; background: #f8f9fa; padding: 10px; text-align: center; }
        .download-btn { display: block; background: #27ae60; color: white; padding: 15px; text-align: center; margin: 20px 0; border-radius: 5px; }
        .login-btn { display: block; background: #3498db; color: white; padding: 15px; text-align: center; margin: 20px 0; border-radius: 5px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        footer { background: #f8f9fa; padding: 20px; text-align: center; margin-top: 50px; }
        @media (max-width: 768px) {
            nav { display: none; }
            .mobile-menu { display: block; }
        }