@media screen and (max-width:768px){.center{text-align:center}}.back-to-top{display:none !important}.floating-btn{position:fixed;bottom:20px;right:20px;padding:15px 20px;text-decoration:none;font-size:16px;z-index:1000;animation:pulse 2s infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.2)}100%{transform:scale(1)}}.nav-line{padding:24px 8px}.nav-line a{border:2px solid #888;margin:5px 0}