body { font-family: 'Segoe UI', Arial, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .logo { font-size: 28px; font-weight: bold; color: #ff6b35; margin-bottom: 20px; }
        nav { background: #2c3e50; padding: 10px; margin-bottom: 30px; }
        nav a { color: white; text-decoration: none; margin: 0 15px; }
        .mobile-toggle { display: none; }
        h1 { color: #2c3e50; border-bottom: 2px solid #ff6b35; padding-bottom: 10px; }
        h2 { color: #34495e; margin-top: 30px; }
        h3 { color: #7f8c8d; }
        .download-btn { background: #27ae60; color: white; padding: 10px 20px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #3498db; color: white; padding: 10px 20px; text-decoration: none; display: inline-block; margin: 15px 0; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        footer { margin-top: 50px; padding: 20px 0; border-top: 1px solid #eee; }
        @media (max-width: 768px) {
            .mobile-toggle { display: block; background: #ff6b35; color: white; padding: 10px; text-align: center; cursor: pointer; }
            nav { display: none; }
            nav.active { display: block; }
        }