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: #008080; border-bottom: 2px solid #FFD700; padding-bottom: 5px; }
        h3 { color: #8B4513; }
        .download-btn { background: #4CAF50; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 10px 0; }
        .login-btn { background: #2196F3; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 10px 0; }
        .nav-mobile { display: none; background: #333; color: white; padding: 10px; text-align: center; cursor: pointer; }
        @media (max-width: 768px) { .nav-mobile { display: block; } .desktop-nav { display: none; } .show { display: block !important; } }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .copyright { text-align: center; margin-top: 30px; font-size: 0.9em; color: #666; }