body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; background: #2c3e50; color: white; padding: 10px; text-align: center; cursor: pointer; }
        .nav-hidden { display: none !important; }
        nav { background: #2c3e50; padding: 15px 0; }
        nav ul { list-style: none; padding: 0; margin: 0; display: flex; justify-content: center; }
        nav li { margin: 0 15px; }
        nav a { color: white; text-decoration: none; font-weight: bold; }
        .logo { font-size: 28px; color: #f1c40f; text-shadow: 1px 1px 2px rgba(0,0,0,0.3); }
        h1 { color: #e74c3c; border-bottom: 3px solid #3498db; padding-bottom: 10px; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #2c3e50; }
        .download-btn { background: #27ae60; color: white; padding: 12px 25px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #3498db; color: white; padding: 12px 25px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .highlight { background: #fffde7; padding: 5px 10px; border-left: 4px solid #f1c40f; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        table { width: 100%; border-collapse: collapse; margin: 20px 0; }
        th, td { border: 1px solid #ddd; padding: 12px; text-align: left; }
        th { background: #f2f2f2; }
        @media (max-width: 768px) {
            nav ul { flex-direction: column; text-align: center; }
            nav li { margin: 10px 0; }
            .mobile-nav { display: block; }
            .desktop-nav { display: none; }
        }