#gsb-app{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial;color:#222}
.gsb-topbar{display:flex;justify-content:space-between;gap:10px;padding:10px;border-bottom:1px solid #e5e7eb;background:#fafafa;position:sticky;top:0;z-index:10}
.gsb-topbar label{margin-right:8px;font-size:14px}
.gsb-topbar input,.gsb-topbar select{padding:4px 6px;border:1px solid #d1d5db;border-radius:6px;font-size:14px}
.gsb-topbar button,.gsb-file span{padding:6px 10px;border:1px solid #d1d5db;background:#fff;border-radius:6px;cursor:pointer}
.gsb-topbar button:hover,.gsb-file span:hover{background:#f3f4f6}
.gsb-file input{display:none}
.gsb-main{display:grid;grid-template-columns:1fr 300px;gap:12px;padding:12px}
.gsb-canvas-panel{border:1px solid #e5e7eb;background:#fff;overflow:auto;display:flex;align-items:center;justify-content:center;min-height:60vh}
.gsb-props{border:1px solid #e5e7eb;background:#fff;padding:10px;border-radius:8px}
.gsb-props h3{margin:10px 0}
.gsb-props label{display:block;margin:6px 0;font-size:13px}
#gsbDebug{font:12px/1.4 monospace;color:#555;white-space:pre-wrap;padding:8px}
.gsb-design-row{display:flex;justify-content:space-between;gap:8px;align-items:center;margin:6px 0}
.gsb-design-row button{padding:4px 8px}