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: #2E8B57; border-bottom: 2px solid #FFD700; padding-bottom: 5px; }
        h3 { color: #4682B4; }
        .logo { font-size: 28px; font-weight: bold; color: #FF4500; text-align: center; margin: 20px 0; }
        .nav { display: flex; justify-content: space-around; background: #333; padding: 10px; margin-bottom: 20px; }
        .nav a { color: white; text-decoration: none; }
        .mobile-toggle { display: none; background: #333; color: white; padding: 10px; text-align: center; cursor: pointer; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .download-btn { display: block; background: #4CAF50; color: white; padding: 15px; text-align: center; margin: 20px 0; text-decoration: none; font-weight: bold; }
        .login-btn { display: block; background: #2196F3; color: white; padding: 15px; text-align: center; margin: 20px 0; text-decoration: none; font-weight: bold; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; display: none; }
            .nav.active { display: flex; }
            .mobile-toggle { display: block; }
        }