body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #1a5276; margin-top: 30px; }
        h1 { font-size: 2.5em; border-bottom: 2px solid #f39c12; padding-bottom: 10px; }
        h2 { font-size: 1.8em; }
        h3 { font-size: 1.4em; }
        .logo { font-size: 2em; font-weight: bold; color: #e74c3c; text-align: center; margin: 20px 0; }
        nav { background: #2c3e50; padding: 15px; text-align: center; position: sticky; top: 0; }
        nav a { color: white; margin: 0 15px; text-decoration: none; font-weight: bold; }
        .mobile-nav-toggle { display: none; background: #e74c3c; color: white; border: none; padding: 10px; cursor: pointer; }
        .content { margin-top: 20px; }
        .download-btn, .login-btn { display: inline-block; background: #2ecc71; color: white; padding: 12px 25px; text-align: center; margin: 15px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        .login-btn { background: #3498db; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .tags { margin: 20px 0; }
        .tags a { background: #f1c40f; color: #333; padding: 5px 10px; margin: 5px; border-radius: 3px; text-decoration: none; }
        footer { background: #2c3e50; color: white; padding: 20px; text-align: center; margin-top: 40px; }
        @media (max-width: 768px) {
            .mobile-nav-toggle { display: block; }
            nav { display: none; }
            nav.active { display: block; }
            .mobile-nav-toggle { margin: 10px auto; display: block; }
        }