body { font-family: 'Arial', sans-serif; line-height: 1.6; max-width: 1200px; margin: 0 auto; padding: 20px; color: #333; }
        h1 { color: #e74c3c; font-size: 2.5em; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #27ae60; }
        .logo { font-size: 2em; font-weight: bold; text-align: center; margin: 20px 0; }
        nav { background: #f8f9fa; padding: 10px; display: flex; justify-content: space-around; }
        .mobile-nav-btn { display: none; }
        @media (max-width: 768px) {
            nav { flex-direction: column; display: none; }
            .mobile-nav-btn { display: block; background: #e74c3c; color: white; padding: 10px; text-align: center; }
            .nav-visible { display: flex; }
        }
        .download-btn { background: #2ecc71; color: white; padding: 12px 20px; text-decoration: none; border-radius: 5px; display: inline-block; margin: 15px 0; }
        .login-btn { background: #3498db; color: white; padding: 12px 20px; text-decoration: none; border-radius: 5px; display: inline-block; margin: 15px 10px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tags { margin: 20px 0; }
        .tag { background: #eee; padding: 5px 10px; margin: 5px; display: inline-block; }
        footer { margin-top: 50px; padding: 20px; background: #333; color: white; }