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: #FF6B35; text-align: center; margin-bottom: 30px; }
        h2 { color: #4CAF50; border-bottom: 2px solid #4CAF50; padding-bottom: 5px; }
        h3 { color: #2196F3; }
        .logo { font-size: 28px; font-weight: bold; color: #FF6B35; text-align: center; margin: 20px 0; }
        .nav { background-color: #333; overflow: hidden; position: relative; }
        .nav a { float: left; display: block; color: white; text-align: center; padding: 14px 16px; text-decoration: none; }
        .nav .icon { display: none; }
        .download-btn { background-color: #4CAF50; color: white; padding: 12px 24px; text-align: center; border-radius: 5px; margin: 20px 0; display: inline-block; }
        .login-btn { background-color: #2196F3; color: white; padding: 12px 24px; text-align: center; border-radius: 5px; margin: 20px 0; display: inline-block; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .mobile-toggle { display: none; }
        @media screen and (max-width: 600px) {
            .nav a:not(:first-child) { display: none; }
            .nav a.icon { float: right; display: block; }
            .nav.responsive { position: relative; }
            .nav.responsive .icon { position: absolute; right: 0; top: 0; }
            .nav.responsive a { float: none; display: block; text-align: left; }
        }