body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF6B6B; text-align: center; }
        h2 { color: #4ECDC4; border-bottom: 2px solid #FF6B6B; padding-bottom: 5px; }
        h3 { color: #45B7D1; }
        .nav { background: #FF6B6B; color: white; padding: 10px; display: flex; justify-content: space-between; align-items: center; }
        .nav-mobile { display: none; }
        .logo { font-size: 24px; font-weight: bold; }
        .logo-variant { color: gold; text-shadow: 1px 1px 2px black; }
        .download-btn, .login-btn { background: #4ECDC4; color: white; padding: 10px 20px; margin: 10px 0; display: inline-block; text-decoration: none; border-radius: 5px; }
        .download-btn:hover, .login-btn:hover { background: #3a9ea0; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { margin-top: 40px; padding-top: 20px; border-top: 2px solid #eee; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; }
            .nav-desktop { display: none; }
            .nav-mobile { display: block; margin-top: 10px; }
        }