body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { display: flex; justify-content: space-between; align-items: center; background: #0066cc; color: white; padding: 15px; border-radius: 5px; }
        .logo { font-size: 24px; font-weight: bold; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        nav a { color: white; margin-left: 15px; text-decoration: none; }
        .mobile-menu-btn { display: none; background: none; border: none; color: white; font-size: 20px; }
        h1 { color: #0066cc; margin-top: 30px; }
        h2 { color: #004d99; margin-top: 25px; }
        h3 { color: #003366; margin-top: 20px; }
        .download-btn, .login-btn { display: inline-block; background: #ff9900; color: white; padding: 10px 20px; margin: 10px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; }
        .tags { margin-top: 20px; }
        .tag { display: inline-block; background: #e0e0e0; padding: 5px 10px; margin-right: 5px; border-radius: 3px; text-decoration: none; color: #333; }
        @media (max-width: 768px) {
            nav { display: none; }
            .mobile-menu-btn { display: block; }
            .show-nav { display: block; }
            header { flex-direction: column; }
        }