body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #ff4500; border-bottom: 2px solid #ff9900; padding-bottom: 10px; }
        h2 { color: #ff6600; margin-top: 25px; }
        h3 { color: #ff8c00; }
        .logo { font-size: 28px; font-weight: bold; color: #ff4500; text-shadow: 1px 1px 2px #ccc; }
        nav { background: #333; padding: 15px; margin-bottom: 20px; }
        nav a { color: white; margin-right: 15px; text-decoration: none; }
        .mobile-nav-btn { display: none; background: #ff4500; color: white; padding: 8px 15px; border: none; cursor: pointer; }
        .download-btn { background: #4CAF50; color: white; padding: 12px 25px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #2196F3; color: white; padding: 12px 25px; text-decoration: none; display: inline-block; margin: 15px 10px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; }
        @media (max-width: 768px) {
            .mobile-nav-btn { display: block; }
            nav { display: none; }
            nav.active { display: block; }
        }