body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF4500; text-align: center; margin-bottom: 30px; }
        h2 { color: #008080; border-bottom: 2px solid #FFD700; padding-bottom: 5px; }
        h3 { color: #20B2AA; }
        .logo { font-size: 28px; font-weight: bold; color: #FF4500; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        nav { background: #333; padding: 10px; margin-bottom: 20px; }
        nav ul { list-style: none; padding: 0; display: flex; justify-content: center; }
        nav li { margin: 0 15px; }
        nav a { color: white; text-decoration: none; }
        .mobile-menu { display: none; background: #333; color: white; padding: 10px; text-align: center; cursor: pointer; }
        .content-img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .download-btn, .login-btn { display: inline-block; padding: 12px 25px; background: #FF4500; color: white; text-decoration: none; border-radius: 5px; margin: 10px 0; font-weight: bold; }
        .download-btn:hover, .login-btn:hover { background: #E03E00; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #ddd; }
        .copyright { font-size: 12px; color: #666; text-align: center; margin-top: 20px; }
        @media (max-width: 768px) {
            nav ul { flex-direction: column; display: none; }
            .mobile-menu { display: block; }
            .show { display: flex !important; }
            body { padding: 10px; }
        }