:root{--bg: #1a1a1a;--panel: #232323;--panel-2: #2a2a2a;--border: #3a3a3a;--text: #ddd;--text-muted: #888;--accent: #4aa3df;--accent-hover: #5cb4f0;--danger: #e25c5c;--ok: #5fc97e}*{box-sizing:border-box}button{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:4px;padding:6px 10px;font-size:12px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:background .15s,border-color .15s}button:hover{background:#333;border-color:#555}button:disabled{opacity:.4;cursor:not-allowed}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.primary:hover{background:var(--accent-hover)}button.danger{background:transparent;border-color:var(--danger);color:var(--danger)}button.danger:hover{background:var(--danger);color:#fff}input,select{background:#1a1a1a;color:var(--text);border:1px solid var(--border);border-radius:4px;padding:4px 6px;font-size:12px;font-family:inherit;width:100%}input:focus,select:focus{outline:none;border-color:var(--accent)}.app{display:grid;grid-template-rows:40px 1fr;grid-template-columns:220px 1fr 280px;grid-template-areas:"topbar topbar topbar" "left center right";height:100vh}.topbar{grid-area:topbar;background:var(--panel);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 12px;gap:12px;font-size:13px}.topbar .brand{font-weight:600;color:var(--accent)}.topbar .spacer{flex:1}.topbar .topbar-group{display:flex;gap:6px;align-items:center}.panel-left,.panel-right{background:var(--panel);overflow:auto;padding:10px}.panel-left{grid-area:left;border-right:1px solid var(--border)}.panel-right{grid-area:right;border-left:1px solid var(--border)}.center{grid-area:center;position:relative;background:#0e0e0e}.section-title{font-size:11px;text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;margin:12px 0 6px;padding-bottom:4px;border-bottom:1px solid var(--border)}.section-title:first-child{margin-top:0}.btn-grid{display:grid;grid-template-columns:1fr 1fr;gap:4px}.btn-grid button{justify-content:flex-start;padding:6px 8px;font-size:11px}.tree-item{padding:4px 6px;border-radius:3px;cursor:pointer;font-size:12px;display:flex;align-items:center;gap:6px;-webkit-user-select:none;user-select:none}.tree-item:hover{background:var(--panel-2)}.tree-item.selected{background:#4aa3df33;border-left:2px solid var(--accent)}.tree-item .vis-toggle{background:transparent;border:none;padding:0;width:14px;height:14px;color:var(--text-muted)}.field-row{display:grid;grid-template-columns:64px 1fr;align-items:center;gap:6px;margin:4px 0;font-size:11px}.field-row label{color:var(--text-muted)}.xyz-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:4px}.toast{position:absolute;bottom:16px;left:50%;transform:translate(-50%);background:var(--panel);border:1px solid var(--border);border-radius:6px;padding:8px 14px;font-size:12px;z-index:1000;pointer-events:none}.viewport-overlay{position:absolute;top:8px;right:8px;display:flex;gap:4px;z-index:40}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:2000}.modal{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:16px;min-width:380px;max-width:520px}.modal h3{margin:0 0 10px;font-size:14px}.modal-actions{display:flex;justify-content:flex-end;gap:6px;margin-top:12px}.help-modal{width:min(820px,90vw);max-height:85vh;display:flex;flex-direction:column;padding:0}.help-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.help-header h3{margin:0;font-size:15px;color:var(--accent)}.help-header button{background:transparent;border:none;padding:2px;color:var(--text-muted)}.help-header button:hover{color:var(--text);background:transparent}.help-content{overflow-y:auto;padding:14px 18px 20px;font-size:13px;line-height:1.65}.help-section{margin-bottom:18px}.help-section-title{font-size:13px;color:var(--accent);border-bottom:1px solid var(--border);padding-bottom:4px;margin:0 0 8px}.help-content h4{font-size:12px;color:var(--text);margin:10px 0 4px}.help-content p{margin:4px 0}.help-content ul,.help-content ol{margin:4px 0;padding-left:22px}.help-content li{margin:2px 0}.help-content b{color:var(--text)}.help-footer{margin-top:18px;padding-top:10px;border-top:1px solid var(--border);color:var(--text-muted);font-size:12px}.boolean-bar{display:flex;gap:4px;margin-top:8px}.boolean-bar button{flex:1}.sketch-editor-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0a0a0a;display:flex;flex-direction:column;z-index:200}.sketch-toolbar{display:flex;align-items:center;gap:6px;padding:6px 10px;background:var(--panel);border-bottom:1px solid var(--border);flex-wrap:wrap}.sketch-toolbar .sketch-title{font-size:12px;color:var(--accent);font-weight:600;margin-right:4px}.sketch-name-input{width:140px}.sketch-tools{display:flex;gap:4px;align-items:center}.sketch-stat{font-size:11px;color:var(--text-muted)}.sketch-hint{background:#4aa3df14;color:var(--accent);font-size:11px;padding:4px 12px;border-bottom:1px solid var(--border)}.sketch-canvas-container{flex:1;position:relative;overflow:hidden}.sketch-floating-delete{position:absolute;top:8px;right:8px}.tree-reorder{display:flex;gap:2px;margin-left:4px}.tree-reorder button{background:transparent;border:none;padding:0;width:14px;height:14px;color:var(--text-muted)}.tree-reorder button:hover{color:var(--accent)}.action-row{display:flex;gap:4px;margin:4px 0}.action-row button{flex:1}.section-panel{position:absolute;top:8px;left:8px;display:flex;align-items:center;gap:6px;background:#232323eb;border:1px solid var(--border);border-radius:6px;padding:6px 10px;z-index:60;font-size:12px;width:480px;max-width:calc(100% - 16px)}.section-panel-title{color:var(--accent);font-weight:600}.section-panel select{width:auto}.ai-chat{position:absolute;top:8px;right:8px;bottom:8px;width:340px;background:var(--panel);border:1px solid var(--border);border-radius:6px;display:flex;flex-direction:column;z-index:80;box-shadow:0 8px 24px #0006}.ai-chat-header{display:flex;align-items:center;gap:6px;padding:8px 10px;border-bottom:1px solid var(--border);font-size:13px;color:var(--accent)}.ai-chat-header button{background:transparent;border:none;padding:2px;color:var(--text-muted)}.ai-chat-header button:hover{color:var(--text);background:transparent}.ai-chat-messages{flex:1;overflow-y:auto;padding:10px;display:flex;flex-direction:column;gap:6px}.ai-msg{font-size:12px;padding:6px 9px;border-radius:8px;max-width:85%;white-space:pre-wrap;word-break:break-word;line-height:1.5}.ai-msg.user{align-self:flex-end;background:var(--accent);color:#fff}.ai-msg.assistant{align-self:flex-start;background:var(--panel-2);border:1px solid var(--border)}.ai-msg.pending{opacity:.5}.ai-chat-input{display:flex;gap:4px;padding:8px;border-top:1px solid var(--border)}.ai-chat-input input{flex:1}