.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.9);display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:9999;color:white}.loading-spinner{width:50px;height:50px;border:4px solid #333;border-top:4px solid #3498db;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:20px}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}#loading-text{font-size:18px;margin-top:10px}.error-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.95);display:none;flex-direction:column;justify-content:center;align-items:center;z-index:9999;color:white;text-align:center;padding:20px}.error-icon{font-size:64px;color:#e74c3c;margin-bottom:20px}.error-title{font-size:24px;font-weight:bold;margin-bottom:15px;color:#e74c3c}.error-message{font-size:16px;margin-bottom:30px;max-width:600px;line-height:1.5;color:#bdc3c7}.error-overlay .btn{background:#3498db;color:white;padding:12px 24px;border:none;border-radius:6px;text-decoration:none;font-size:16px;transition:background 0.3s ease}.error-overlay .btn:hover{background:#2980b9}.fbx-distance-label{position:absolute;background:rgba(255,255,0,0.7);color:black;padding:1px 4px;border-radius:1px;font-size:10px;font-weight:bold;z-index:1000;pointer-events:none;border:1px solid #000;box-shadow:0 1px 2px rgba(0,0,0,0.3);font-family:monospace;white-space:nowrap;display:none;transform:translateY(-50%)}