*{margin:0;padding:0;box-sizing:border-box}html,body,#root{width:100%;height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#0d1117;color:#e6edf3}.app{width:100%;height:100%;display:flex;flex-direction:column}.upload-screen{display:flex;align-items:center;justify-content:center;height:100%;background:linear-gradient(135deg,#0d1117,#161b22)}.file-upload{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 80px;border:2px dashed #30363d;border-radius:16px;cursor:pointer;transition:all .2s;background:#161b22cc}.file-upload:hover{border-color:#58a6ff;background:#161b22}.upload-icon{font-size:48px;margin-bottom:16px}.file-upload h2{font-size:24px;margin-bottom:8px;color:#e6edf3}.file-upload p{color:#8b949e;font-size:14px}.upload-actions{display:flex;gap:12px;margin-top:20px}.upload-action-btn{padding:10px 18px;border:1px solid #30363d;border-radius:8px;background:#21262d;color:#e6edf3;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s}.upload-action-btn:hover{background:#30363d;border-color:#8b949e}.upload-action-btn.primary{background:#1f6feb;border-color:#58a6ff;color:#fff}.upload-action-btn.primary:hover{background:#388bfd;border-color:#79c0ff}.upload-formats{margin-top:12px;font-size:12px!important;color:#6e7681!important}.toolbar{display:flex;align-items:center;justify-content:space-between;height:48px;padding:0 16px;background:#161b22;border-bottom:1px solid #30363d;flex-shrink:0}.toolbar-left{display:flex;align-items:center;gap:16px}.toolbar-title{font-weight:700;font-size:16px;color:#58a6ff}.toolbar-file{font-size:13px;color:#8b949e;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toolbar-center{display:flex;gap:4px}.toolbar-right{display:flex;gap:8px}.toolbar-btn{padding:6px 14px;border:1px solid #30363d;border-radius:6px;background:#21262d;color:#e6edf3;font-size:13px;cursor:pointer;transition:all .15s}.toolbar-btn:hover{background:#30363d;border-color:#8b949e}.toolbar-btn.active{background:#1f6feb;border-color:#58a6ff;color:#fff}.main-layout{display:flex;flex:1;overflow:hidden}.viewer-container{flex:1;position:relative}.viewer-3d{width:100%;height:100%}.panel-container{width:340px;flex-shrink:0;border-left:1px solid #30363d;background:#161b22;display:flex;flex-direction:column}.weld-panel{display:flex;flex-direction:column;height:100%}.panel-header{padding:12px 16px;border-bottom:1px solid #30363d;display:flex;flex-direction:column;gap:8px}.panel-header h3{font-size:14px;font-weight:600}.panel-actions{display:flex;gap:8px}.mode-btn{flex:1;padding:8px 12px;border:1px solid #30363d;border-radius:6px;background:#21262d;color:#e6edf3;font-size:12px;cursor:pointer;transition:all .15s}.mode-btn:hover{background:#30363d}.mode-btn.active{background:#da3633;border-color:#f85149;color:#fff}.path-options{padding:12px 16px;border-bottom:1px solid #30363d;display:flex;flex-direction:column;gap:10px}.path-toggle{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:#e6edf3;-webkit-user-select:none;user-select:none}.path-toggle input{width:16px;height:16px;accent-color:#1f6feb}.path-toggle:has(input:disabled){color:#6e7681}.path-style-toggle{display:grid;grid-template-columns:1fr 1fr;gap:6px}.path-style-btn{padding:7px 10px;border:1px solid #30363d;border-radius:6px;background:#21262d;color:#e6edf3;font-size:12px;cursor:pointer;transition:all .15s}.path-style-btn:hover:not(:disabled){background:#30363d}.path-style-btn.active{background:#1f6feb;border-color:#58a6ff;color:#fff}.path-style-btn:disabled{cursor:not-allowed;opacity:.55}.weld-list{flex:1;overflow-y:auto;padding:8px}.empty-state{padding:24px 16px;text-align:center;color:#8b949e;font-size:13px}.empty-state p+p{margin-top:8px}.weld-item{padding:10px 12px;margin-bottom:4px;border-radius:6px;background:#21262d;border:1px solid transparent;cursor:pointer;transition:all .15s;-webkit-user-select:none;user-select:none}.weld-item:hover{background:#292e36;border-color:#30363d}.weld-item.selected{border-color:#58a6ff;background:#1c2333}.weld-item[draggable]{cursor:grab}.weld-item[draggable]:active{cursor:grabbing}.weld-item.dragging{opacity:.5;background:#1a1f26}.weld-item.drop-target{border-color:#1f6feb!important;background:#1f6feb1a;box-shadow:inset 0 0 0 1px #1f6feb}.weld-item-header{display:flex;align-items:center;gap:8px}.weld-drag-handle{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;color:#6e7681;cursor:grab;font-size:10px;flex-shrink:0;font-weight:700;letter-spacing:-2px;-webkit-user-select:none;user-select:none;transition:color .15s}.weld-item:hover .weld-drag-handle{color:#8b949e}.weld-item.dragging .weld-drag-handle{color:#1f6feb}.weld-seq{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;background:#1f6feb;color:#fff;font-size:11px;font-weight:700;flex-shrink:0}.weld-label{flex:1;font-size:13px;font-weight:600}.weld-label-input{flex:1;padding:2px 6px;font-size:13px;background:#0d1117;border:1px solid #58a6ff;border-radius:4px;color:#e6edf3;outline:none}.weld-delete{width:24px;height:24px;border:none;background:none;color:#8b949e;cursor:pointer;border-radius:4px;font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.weld-delete:hover{background:#da3633;color:#fff}.weld-details{margin-top:6px;display:flex;flex-direction:column;gap:2px;font-size:11px;color:#8b949e;font-family:SFMono-Regular,Consolas,monospace}.panel-footer{padding:12px 16px;border-top:1px solid #30363d}.export-btn{width:100%;padding:10px 16px;border:none;border-radius:6px;background:#238636;color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:all .15s}.export-btn:hover{background:#2ea043}.loading-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#0d1117e6;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.loading-overlay p{margin-top:16px;color:#8b949e;font-size:14px}.loading-spinner{width:48px;height:48px;border:3px solid #30363d;border-top-color:#58a6ff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.weld-list::-webkit-scrollbar{width:6px}.weld-list::-webkit-scrollbar-track{background:transparent}.weld-list::-webkit-scrollbar-thumb{background:#30363d;border-radius:3px}.weld-list::-webkit-scrollbar-thumb:hover{background:#484f58}