body { font-family: 'Segoe UI', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; background-color: #f5f9ff; }
        .logo { font-size: 2.2em; font-weight: bold; color: #0066cc; text-shadow: 1px 1px 2px rgba(0,0,0,0.1); }
        nav { background-color: #003366; padding: 10px; margin-bottom: 20px; }
        nav a { color: white; text-decoration: none; margin: 0 15px; }
        .mobile-toggle { display: none; }
        h1 { color: #003366; border-bottom: 2px solid #0066cc; padding-bottom: 10px; }
        h2 { color: #005599; margin-top: 30px; }
        h3 { color: #0077cc; }
        .download-btn { background-color: #4CAF50; color: white; padding: 12px 25px; text-align: center; margin: 20px 0; display: inline-block; border-radius: 5px; text-decoration: none; }
        .login-btn { background-color: #2196F3; color: white; padding: 12px 25px; text-align: center; margin: 20px 0; display: inline-block; border-radius: 5px; text-decoration: none; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .tag { background-color: #e0f0ff; padding: 5px 10px; margin: 5px; display: inline-block; border-radius: 20px; }
        footer { margin-top: 40px; padding: 20px; background-color: #003366; color: white; text-align: center; }
        @media (max-width: 768px) {
            nav { display: none; }
            .mobile-toggle { display: block; background-color: #003366; color: white; padding: 10px; text-align: center; cursor: pointer; }
            .active-nav { display: block; }
        }