body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #0066cc; }
        h1 { font-size: 2.2em; }
        h2 { font-size: 1.8em; margin-top: 30px; }
        h3 { font-size: 1.4em; margin-top: 25px; }
        .logo { font-size: 2.5em; font-weight: bold; color: #ff6600; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        .nav { background: #333; padding: 10px; position: sticky; top: 0; z-index: 100; }
        .nav a { color: white; margin: 0 15px; text-decoration: none; }
        .mobile-nav-btn { display: none; background: #ff6600; color: white; border: none; padding: 8px 15px; cursor: pointer; }
        .content { margin-top: 20px; }
        .highlight { background: #fff8e1; padding: 10px; border-left: 4px solid #ff6600; }
        .download-btn, .login-btn { display: inline-block; padding: 12px 25px; background: #0066cc; color: white; text-decoration: none; margin: 15px 0; border-radius: 5px; }
        .image-container { text-align: center; margin: 25px 0; }
        img { max-width: 100%; height: auto; }
        .footer { margin-top: 50px; padding: 20px; background: #333; color: white; text-align: center; }
        @media (max-width: 768px) {
            .nav { display: none; }
            .mobile-nav-btn { display: block; }
            .nav.active { display: block; }
            .nav a { display: block; padding: 10px; }
        }