body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, 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; }
        }
        .logo { font-size: 2em; font-weight: bold; color: #ff6b35; text-shadow: 2px 2px 4px rgba(0,0,0,0.1); }
        nav a { margin: 0 10px; text-decoration: none; color: #ff6b35; }
        h1 { color: #2c3e50; border-bottom: 2px solid #ff6b35; padding-bottom: 10px; }
        h2 { color: #34495e; margin-top: 30px; }
        h3 { color: #7f8c8d; }
        .download-btn, .login-btn { 
            display: inline-block; 
            padding: 10px 20px; 
            margin: 10px 0; 
            background: #ff6b35; 
            color: white; 
            border-radius: 5px; 
            text-decoration: none; 
            font-weight: bold; 
        }
        .img-container { margin: 20px 0; text-align: center; }
        img { max-width: 100%; height: auto; }
        .tag { background: #ecf0f1; padding: 3px 8px; border-radius: 3px; margin: 2px; display: inline-block; }
        footer { margin-top: 50px; padding-top: 20px; border-top: 1px solid #eee; }