.loading-indicator{text-align:center;padding:40px 20px;margin-top:20px}.loading-spinner{display:flex;flex-direction:column;align-items:center;gap:15px}.spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #3498db;border-radius:50%;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.loading-spinner span{color:#666;font-size:14px}.scroll-sentinel{visibility:hidden;pointer-events:none}.end-message{text-align:center;padding:40px 20px;margin-top:20px;border-top:1px solid #e0e0e0}.end-message p{color:#666;font-size:14px}.error-message{text-align:center;padding:20px;margin-top:20px;background-color:#fee;border:1px solid #fcc;border-radius:4px}.error-message p{color:#c00;font-size:14px}