:root{--bg:#f4f5f7;--surface:#fff;--border:#e6e8eb;--border-strong:#d4d8dd;--text:#1b1e23;--text-muted:#868d96;--accent:#2563eb;--accent-soft:#eef3ff;--danger:#dc2626;--ok:#16a34a;--canvas-bg:#e9ebef;--region:#fff;--radius:10px;--radius-sm:7px}*{box-sizing:border-box}html,body,#root{height:100%}body{color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{grid-template-rows:auto 1fr auto;height:100%;display:grid}.topbar{border-bottom:1px solid var(--border);background:var(--surface);justify-content:space-between;align-items:center;gap:16px;padding:8px 14px;display:flex}.topbar-actions{flex-shrink:0;align-items:center;gap:8px;display:flex}.underlay-import{cursor:pointer;align-items:center;display:inline-flex}.underlay-active{align-items:center;gap:8px;padding:0 4px;display:flex}.underlay-label{color:var(--text-muted);font-size:12px}.underlay-opacity{width:88px}.underlay-remove{color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:2px 4px;font-size:16px;line-height:1}.underlay-remove:hover{color:var(--text)}.main{min-height:0;display:flex}.leftpanel{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:24px;width:272px;padding:22px 20px;display:flex;position:relative;overflow-y:auto}.toolrail{border-right:1px solid var(--border);background:var(--surface);flex-shrink:0;padding:12px 8px}.panel-collapse{color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:2px 6px;font-size:16px;line-height:1;position:absolute;top:8px;right:10px}.panel-reopen{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;border-left:none;border-radius:0 6px 6px 0;align-self:flex-start;padding:10px 6px;font-size:14px}.dock{border-top:1px solid 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var(--border);flex-direction:column;align-items:center;gap:6px;padding-top:10px;display:flex}.tool-group:first-child{border-top:none;padding-top:0}.tool{border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;padding:6px;transition:background .12s,border-color .12s,color .12s;display:inline-flex}.tool:hover{border-color:var(--accent);color:var(--accent)}.tool.active{background:var(--accent);border-color:var(--accent);color:#fff}.tool:disabled{opacity:.4;cursor:default}.tool:disabled:hover{border-color:var(--border-strong);color:var(--text)}.design-header{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.tab{border:1px solid var(--border-strong);background:var(--surface);border-radius:999px;align-items:center;display:inline-flex;overflow:hidden}.tab.active{border-color:var(--accent)}.tab-label{font:inherit;color:var(--text);cursor:pointer;background:0 0;border:none;padding:6px 10px;font-size:12px}.tab.active .tab-label{color:var(--accent);font-weight:600}.tab-copy{font:inherit;color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:0 4px 0 1px;font-size:12px;line-height:1}.tab-copy:hover{color:var(--accent)}.tab-close{font:inherit;color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:0 9px 0 1px;line-height:1}.tab-close:hover{color:var(--danger)}.tab-add{font:inherit;color:var(--text-muted);cursor:pointer;padding:5px 11px;font-size:14px}.tab-add:hover{border-color:var(--accent);color:var(--accent)}.tab-edit{font:inherit;border:1px solid var(--accent);border-radius:999px;width:100px;padding:5px 9px;font-size:12px}.btn{font:inherit;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;padding:8px 12px;font-size:13px;transition:border-color .12s,color .12s}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.45;cursor:default}.btn-danger:hover:not(:disabled){border-color:var(--danger);color:var(--danger)}.sidebar-footer{flex-direction:column;gap:8px;margin-top:auto;display:flex}.param-row{flex-direction:column;gap:5px;display:flex}.param-head{justify-content:space-between;font-size:12px;display:flex}.param-value{color:var(--text-muted);font-variant-numeric:tabular-nums}.param-expr{font:inherit;border:1px solid var(--border-strong);background:var(--surface);width:100%;color:var(--text);font-variant-numeric:tabular-nums;border-radius:6px;padding:5px 8px;font-size:12px}.param-expr:focus{border-color:var(--accent);outline:none}.param-error{color:#dc2626;font-size:11px}.param-help-wrap{flex-direction:column;gap:6px;display:flex}.param-help-toggle{color:var(--text-muted);font:inherit;cursor:pointer;background:0 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