body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; }
        }
        h1 { color: #FF6B35; font-size: 2.5em; }
        h2 { color: #4E944F; margin-top: 30px; }
        h3 { color: #8B4513; }
        .download-btn { background: #FF6B35; color: white; padding: 10px 20px; margin: 10px 0; display: inline-block; }
        .login-btn { background: #4E944F; color: white; padding: 10px 20px; margin: 10px 0; display: inline-block; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tags { margin: 20px 0; }
        .tag { background: #eee; padding: 5px 10px; margin: 5px; display: inline-block; }
        .copyright { margin-top: 50px; font-size: 0.8em; color: #666; }