:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#0f172a;background-color:#f8fafc}*{box-sizing:border-box}body{margin:0;min-height:100vh}button{cursor:pointer}.app-grid{display:grid;grid-template-columns:280px 1fr 320px;grid-template-rows:auto 1fr;min-height:100vh;gap:12px;padding:12px}.panel{background:#fff;border:1px solid #e2e8f0;border-radius:8px;padding:12px;box-shadow:0 1px 2px #0000000a}.panel h3{margin:0 0 8px;font-size:14px;text-transform:uppercase;letter-spacing:.04em;color:#475569}.stack{display:flex;flex-direction:column;gap:8px}.row{display:flex;gap:8px}.input{width:100%;padding:8px;border:1px solid #cbd5e1;border-radius:6px;font-size:14px}.btn{border:1px solid #cbd5e1;background:#f8fafc;border-radius:6px;padding:6px 10px;font-size:14px}.btn.primary{background:#2563eb;color:#fff;border-color:#1d4ed8}.btn.danger{color:#b91c1c;border-color:#fecdd3;background:#fff1f2}.list{border:1px solid #e2e8f0;border-radius:6px;max-height:260px;overflow:auto}.list-item{padding:8px;border-bottom:1px solid #e2e8f0;display:flex;justify-content:space-between;align-items:center}.list-item:last-child{border-bottom:none}.canvas-shell{position:relative;background:#0f172a;border:1px solid #0f172a;border-radius:8px;overflow:hidden;min-height:400px}.canvas-container{position:relative;width:100%;height:100%;display:flex;justify-content:center;align-items:center;overflow:auto;padding:0}.canvas-layer{max-width:100%;height:auto;display:block;background:#111827}.overlay{position:absolute;top:0;left:0;right:0;bottom:0}.element-frame{position:absolute;border:1px dashed rgba(59,130,246,.8);background:#3b82f61a;pointer-events:all}.handle{position:absolute;width:10px;height:10px;background:#2563eb;border:1px solid #fff;border-radius:50%}.handle.nw{top:-6px;left:-6px;cursor:nwse-resize}.handle.ne{top:-6px;right:-6px;cursor:nesw-resize}.handle.sw{bottom:-6px;left:-6px;cursor:nesw-resize}.handle.se{bottom:-6px;right:-6px;cursor:nwse-resize}.handle.rotate{top:-26px;left:50%;transform:translate(-50%);cursor:grab;background:#f97316}.tag{display:inline-block;padding:2px 6px;border-radius:999px;font-size:12px;background:#e2e8f0;color:#475569}.small-label{font-size:12px;color:#475569}