:root{--bg:#e8edf1;--panel:#ffffffe0;--panel-border:#0f172a14;--text:#1e2329;--muted:#65707c;--accent:#2563eb;--accent-soft:#2563eb1f;--shadow:0 6px 24px #0f172a1f, 0 1px 3px #0f172a14;--radius:12px;--sa-t:env(safe-area-inset-top,0px);--sa-r:env(safe-area-inset-right,0px);--sa-b:env(safe-area-inset-bottom,0px);--sa-l:env(safe-area-inset-left,0px);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px}*{box-sizing:border-box}[hidden]{display:none!important}html,body{background:var(--bg);height:100%;margin:0;overflow:hidden}#viewport,#viewport canvas{width:100%;height:100%;display:block;position:fixed;inset:0}#viewport canvas{outline:none}.labels-layer{pointer-events:none;inset:0;position:fixed!important}svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}.sr{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.panel{background:var(--panel);-webkit-backdrop-filter:blur(10px);border:1px solid var(--panel-border);border-radius:var(--radius);box-shadow:var(--shadow);z-index:10;position:fixed}button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation}*{-webkit-tap-highlight-color:transparent}body.touch{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}body.touch input{-webkit-user-select:auto;user-select:auto}.topbar{align-items:center;gap:10px;max-width:calc(100vw - 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