body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #ff6b35; text-align: center; }
        h2 { color: #4ecdc4; border-bottom: 2px solid #4ecdc4; padding-bottom: 5px; }
        h3 { color: #ff9f1c; }
        .nav-btn { display: none; background: #ff6b35; color: white; padding: 10px; border: none; cursor: pointer; }
        .nav-links { display: flex; justify-content: space-around; padding: 10px; background: #f8f8f8; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .nav-btn { display: block; }
            .mobile-nav { display: block; }
        }
        .download-btn { background: #4ecdc4; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; margin: 10px 0; }
        .login-btn { background: #ff9f1c; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; margin: 10px 0; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { text-align: center; padding: 20px; background: #f8f8f8; margin-top: 30px; }