body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #1a73e8; margin-top: 30px; }
        h1 { font-size: 2.5em; }
        h2 { font-size: 2em; }
        h3 { font-size: 1.5em; }
        .logo { font-size: 2em; font-weight: bold; color: #ff6f00; text-align: center; margin: 20px 0; }
        .nav { display: flex; justify-content: space-around; background: #f0f0f0; padding: 10px; margin-bottom: 20px; }
        .nav a { color: #1a73e8; text-decoration: none; }
        .mobile-nav-toggle { display: none; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; align-items: center; display: none; }
            .nav.active { display: flex; }
            .mobile-nav-toggle { display: block; text-align: center; background: #ff6f00; color: white; padding: 10px; margin-bottom: 20px; }
        }
        .download-btn, .login-btn { display: inline-block; padding: 10px 20px; background: #1a73e8; color: white; text-decoration: none; margin: 10px 0; border-radius: 5px; }
        .download-btn:hover, .login-btn:hover { background: #0d47a1; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { background: #f0f0f0; padding: 20px; text-align: center; margin-top: 30px; }
        .tags { margin: 20px 0; }
        .tags a { background: #e0e0e0; padding: 5px 10px; margin: 5px; text-decoration: none; color: #333; border-radius: 3px; }