body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF4500; text-align: center; }
        h2 { color: #006400; border-bottom: 2px solid #FFD700; }
        h3 { color: #8B4513; }
        .logo { font-size: 2em; font-weight: bold; color: #FF4500; text-shadow: 2px 2px 4px #000; }
        .nav { background: #FFD700; padding: 10px; position: sticky; top: 0; }
        .nav-mobile { display: none; }
        .download-btn { background: #006400; color: white; padding: 10px 20px; text-decoration: none; margin: 10px; }
        .login-btn { background: #8B4513; color: white; padding: 10px 20px; text-decoration: none; margin: 10px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { background: #333; color: white; text-align: center; padding: 20px; margin-top: 30px; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .nav-mobile { display: block; }
        }