body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; background-color: #f5f5f5; }
        header { background-color: #2c3e50; color: white; padding: 15px; border-radius: 5px; margin-bottom: 30px; }
        .logo { font-size: 28px; font-weight: bold; text-transform: uppercase; letter-spacing: 2px; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .mobile-menu-btn { display: none; background: #3498db; color: white; border: none; padding: 8px 12px; border-radius: 4px; }
        .content { background: white; padding: 25px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        h1 { color: #2c3e50; margin-top: 0; }
        h2 { color: #3498db; border-bottom: 2px solid #eee; padding-bottom: 5px; }
        h3 { color: #e74c3c; }
        .download-btn, .login-btn { display: inline-block; background: #27ae60; color: white; padding: 12px 25px; margin: 10px 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: 5px; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; text-align: center; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background: #eee; padding: 5px 10px; margin: 3px; border-radius: 15px; }
        @media (max-width: 768px) {
            .mobile-menu-btn { display: block; }
            nav ul { display: none; }
            body { padding: 10px; }
        }