:root{
    --bg:#0d1117; --panel:#161b22; --panel2:#1c2330; --border:#2a3140;
    --text:#e6edf3; --muted:#8b949e; --accent:#2f81f7; --accent2:#3fb950;
    --danger:#f85149; --warn:#d29922;
    --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    --mono: ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  }
  *{box-sizing:border-box}
  html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:var(--font);font-size:13px}
  body{display:flex;flex-direction:column;overflow:hidden}
  header{display:flex;align-items:center;gap:16px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border);flex-shrink:0}
  header h1{font-size:15px;margin:0;font-weight:600;letter-spacing:.2px}
  header .sub{color:var(--muted);font-size:12px}
  .spacer{flex:1}
  .btn{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:6px 12px;font-size:12px;cursor:pointer;font-family:var(--font);display:inline-flex;align-items:center;gap:5px}
  .btn:hover{border-color:var(--accent)}
  .btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
  .layout{flex:1;display:flex;min-height:0}
  /* sidebar */
  aside{width:330px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}
  .side-head{padding:10px 12px;border-bottom:1px solid var(--border)}
  .search{width:100%;background:var(--panel2);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:7px 9px;font-size:12px;font-family:var(--font)}
  .search::placeholder{color:var(--muted)}
  .side-actions{display:flex;gap:6px;margin-top:8px}
  .side-actions button{flex:1;background:var(--panel2);border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:5px;font-size:11px;cursor:pointer;font-family:var(--font)}
  .side-actions button:hover{color:var(--text);border-color:var(--accent)}
  .series-list{flex:1;overflow-y:auto;padding:4px 6px}
  /* module block */
  .mod-block{margin-bottom:6px;border:1px solid var(--border);border-radius:8px;overflow:hidden}
  .mod-head{display:flex;align-items:center;gap:8px;padding:8px 10px;background:var(--panel2);cursor:pointer;user-select:none}
  .mod-head .swatch{width:10px;height:10px;border-radius:3px;flex-shrink:0}
  .mod-head .mod-name{flex:1;font-weight:600;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mod-head .mod-meta{color:var(--muted);font-size:10px;flex-shrink:0}
  .mod-head .fmt-badge{font-size:9px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;color:var(--accent);background:rgba(47,129,247,.12);border:1px solid rgba(47,129,247,.35);border-radius:4px;padding:1px 5px;flex-shrink:0}
  .mod-head .fmt-badge:empty{display:none}
  .mod-head .caret{color:var(--muted);font-size:10px;transition:transform .15s;width:12px;text-align:center}
  .mod-block.collapsed .caret{transform:rotate(-90deg)}
  .mod-block.collapsed .mod-channels{display:none}
  .mod-head .mod-remove{display:inline-flex;align-items:center;gap:4px;background:transparent;border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:3px 7px;font-size:11px;line-height:1;cursor:pointer;font-family:var(--font);flex-shrink:0}
  .mod-head .mod-remove:hover{color:#fff;background:var(--danger);border-color:var(--danger)}
  .mod-head .mod-remove svg{display:block}
  .mod-channels{padding:3px 4px}
  .group-title{font-size:9px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);padding:7px 8px 3px;font-weight:600}
  .series-item{display:flex;align-items:center;gap:8px;padding:5px 8px;border-radius:6px;cursor:pointer;user-select:none}
  .series-item:hover{background:var(--panel2)}
  .series-item .sw{width:11px;height:11px;border-radius:3px;flex-shrink:0;border:1px solid rgba(255,255,255,.15)}
  .series-item .nm{flex:1;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .series-item.off .nm{color:var(--muted)}
  .series-item.off .sw{background:transparent !important;border-color:var(--border)}
  .series-item .val{font-family:var(--mono);font-size:11px;color:var(--muted);flex-shrink:0}
  /* main */
  main{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0}
  .controls{display:flex;align-items:center;gap:14px;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--panel);flex-wrap:wrap}
  .ctrl{display:flex;align-items:center;gap:6px}
  .ctrl label{color:var(--muted);font-size:11px}
  .ctrl input[type=datetime-local]{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:5px 7px;font-size:11px;font-family:var(--font);color-scheme:dark}
  .quick{display:flex;gap:4px}
  .quick button{background:var(--panel2);border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:5px 9px;font-size:11px;cursor:pointer;font-family:var(--font)}
  .quick button:hover{color:var(--text);border-color:var(--accent)}
  .hint{color:var(--muted);font-size:11px;margin-left:auto}
  .chart-wrap{flex:1;position:relative;min-height:0;padding:8px 12px 12px}
  #chart{width:100%;height:100%}
  /* uPlot dark tweaks */
  .uplot{font-family:var(--font)}
  .u-legend{display:none}
  .u-tooltip{position:absolute;z-index:30;background:var(--panel2);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:11px;pointer-events:none;box-shadow:0 6px 22px rgba(0,0,0,.5);max-width:360px;display:none}
  .u-tooltip .tt-time{color:var(--muted);font-family:var(--mono);margin-bottom:6px;border-bottom:1px solid var(--border);padding-bottom:4px}
  .u-tooltip .tt-row{display:flex;align-items:center;gap:6px;padding:1px 0}
  .u-tooltip .tt-row .d{width:9px;height:9px;border-radius:2px;flex-shrink:0}
  .u-tooltip .tt-row .n{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .u-tooltip .tt-row .mod{color:var(--muted);font-size:10px}
  .u-tooltip .tt-row .v{font-family:var(--mono);font-weight:600}
  /* empty / drop */
  .empty-state{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;text-align:center;padding:0 40px}
  .empty-state .big{font-size:46px;color:var(--accent);line-height:1}
  .empty-state .t{font-size:18px;font-weight:600}
  .empty-state .s{color:var(--muted);font-size:13px;max-width:440px;line-height:1.5}
  .empty-msg{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;text-align:center;padding:0 40px}
  #dropOverlay{position:fixed;inset:0;z-index:100;background:rgba(13,17,23,.82);display:none;align-items:center;justify-content:center}
  #dropOverlay.show{display:flex}
  .drop-card{border:2px dashed var(--accent);border-radius:16px;padding:48px 64px;text-align:center;background:var(--panel)}
  .drop-icon{font-size:46px;color:var(--accent);line-height:1}
  .drop-title{font-size:18px;font-weight:600;margin-top:14px}
  .drop-sub{color:var(--muted);font-size:13px;margin-top:6px}
  #toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:120;background:var(--panel2);border:1px solid var(--border);border-radius:8px;padding:10px 16px;font-size:13px;display:none;box-shadow:0 8px 30px rgba(0,0,0,.5);max-width:560px}
  #toast.err{border-color:var(--danger);color:#ffb3ad}
  #toast.ok{border-color:var(--accent2)}
  /* confirm modal */
  .modal-overlay{position:fixed;inset:0;z-index:200;background:rgba(13,17,23,.7);display:none;align-items:center;justify-content:center}
  .modal-overlay.show{display:flex}
  .modal-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:22px 24px;max-width:420px;width:90%;box-shadow:0 18px 50px rgba(0,0,0,.6)}
  .modal-title{font-size:16px;font-weight:600;margin-bottom:10px}
  .modal-body{color:var(--muted);font-size:13px;line-height:1.5;margin-bottom:20px}
  .modal-actions{display:flex;justify-content:flex-end;gap:10px}
  .btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
  .btn.danger:hover{filter:brightness(1.1)}
  /* segmented control (X-axis mode) */
  .seg{display:inline-flex;background:var(--panel2);border:1px solid var(--border);border-radius:8px;overflow:hidden}
  .seg button{background:transparent;border:0;color:var(--muted);padding:6px 12px;cursor:pointer;font-size:12px;font-weight:500;font-family:var(--font)}
  .seg button + button{border-left:1px solid var(--border)}
  .seg button.active{background:var(--accent);color:#fff}
  .controls .divider{width:1px;align-self:stretch;background:var(--border);margin:0 2px}
  /* offset panel */
  #offsetPanel{display:none;border-bottom:1px solid var(--border);background:var(--panel);padding:10px 16px}
  #offsetPanel.show{display:block}
  .offset-head{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:8px}
  .offset-head span{flex:1}
  #offsetList{display:flex;flex-direction:column;gap:7px}
  .offset-row{display:flex;align-items:center;gap:10px}
  .offset-row .swatch{width:10px;height:10px;border-radius:3px;flex-shrink:0}
  .offset-row .onm{font-size:12px;font-weight:600;min-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .offset-row input[type=range]{flex:1;accent-color:var(--accent);min-width:120px}
  .offset-row .nudge{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;width:26px;height:26px;cursor:pointer;font-size:14px;line-height:1;font-family:var(--font)}
  .offset-row .nudge:hover{border-color:var(--accent)}
  .offset-row .oval{font-family:var(--mono);font-size:12px;min-width:96px;text-align:right;color:var(--text)}
  .offset-row input[type=number]{width:78px;background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:4px 6px;font-size:12px;font-family:var(--mono)}
  ::-webkit-scrollbar{width:9px;height:9px}
  ::-webkit-scrollbar-thumb{background:var(--border);border-radius:5px}
  ::-webkit-scrollbar-track{background:transparent}
  /* tools row */
  .tools-row{gap:8px;padding-top:8px;padding-bottom:8px}
  .tools-label{color:var(--muted);font-size:11px;margin-right:2px}
  .tool-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}
  .tool-hint{color:var(--muted);font-size:11px;margin-left:8px}
  .tool-sep{width:1px;height:20px;background:var(--border);margin:0 4px}
  .tools-row select#cursorMode{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:5px 7px;font-size:12px;font-family:var(--font)}
  /* floating cursor readout panel */
  #floatPanel{position:absolute;z-index:28;background:var(--panel2);border:1px solid var(--border);border-radius:8px;min-width:190px;max-width:320px;box-shadow:0 8px 30px rgba(0,0,0,.55);display:none;overflow:hidden}
  #floatPanel .fp-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 9px;background:var(--panel);border-bottom:1px solid var(--border);cursor:move;user-select:none;font-size:11px;font-weight:600}
  #floatPanel .fp-drag{color:var(--muted);font-weight:400;font-size:10px}
  #floatPanel .fp-body{padding:7px 9px;font-size:11px;max-height:260px;overflow-y:auto}
  #floatPanel .fp-hint{color:var(--muted);font-style:italic}
  #floatPanel .tt-time{color:var(--muted);font-family:var(--mono);margin-bottom:5px;border-bottom:1px solid var(--border);padding-bottom:4px}
  #floatPanel .tt-row{display:flex;align-items:center;gap:6px;padding:1px 0}
  #floatPanel .tt-row .d{width:9px;height:9px;border-radius:2px;flex-shrink:0}
  #floatPanel .tt-row .n{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  #floatPanel .tt-row .mod{color:var(--muted);font-size:10px}
  #floatPanel .tt-row .v{font-family:var(--mono);font-weight:600}
  /* tool panels */
  .tool-panel{display:none;border-bottom:1px solid var(--border);background:var(--panel);padding:10px 16px;max-height:230px;overflow-y:auto}
  .tool-panel.show{display:block}
  .tp-head{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:8px;flex-wrap:wrap}
  .tp-head > span:first-child{font-weight:600;color:var(--text)}
  .tp-note{flex:1;font-style:italic}
  .tool-panel select{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:4px 7px;font-size:12px;font-family:var(--font);max-width:280px}
  /* measurement table */
  .measure-table{width:100%;border-collapse:collapse;font-size:12px}
  .measure-table th{text-align:left;color:var(--muted);font-weight:600;font-size:10px;text-transform:uppercase;letter-spacing:.4px;padding:4px 8px;border-bottom:1px solid var(--border)}
  .measure-table td{padding:4px 8px;border-bottom:1px solid var(--border);font-family:var(--mono)}
  .measure-table td.lbl{font-family:var(--font)}
  .measure-table .ptdot{display:inline-block;width:16px;height:16px;line-height:16px;text-align:center;border-radius:50%;color:#fff;font-size:10px;font-weight:700;font-family:var(--font)}
  .measure-table .delta{color:var(--accent2)}
  .measure-table tr.delta-row td{color:var(--muted);border-bottom:1px dashed var(--border);font-size:11px}
  .measure-table .pt-actions{white-space:nowrap;text-align:right}
  .measure-table .pt-edit{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:2px 8px;font-size:11px;cursor:pointer;font-family:var(--font);margin-right:5px}
  .measure-table .pt-edit:hover{border-color:var(--accent)}
  .measure-table .pt-edit.active{background:var(--accent2);border-color:var(--accent2);color:#04260f}
  .measure-table .pt-del{background:transparent;border:1px solid var(--border);color:var(--muted);border-radius:6px;width:22px;height:22px;font-size:14px;line-height:1;cursor:pointer;font-family:var(--font)}
  .measure-table .pt-del:hover{color:#fff;background:var(--danger);border-color:var(--danger)}
  /* annotation list */
  .anno-row{display:flex;align-items:center;gap:10px;padding:5px 0;font-size:12px;border-bottom:1px solid var(--border)}
  .anno-row .ax{font-family:var(--mono);color:var(--muted);min-width:120px}
  .anno-row .alabel{flex:1}
  .anno-row .anno-x{color:var(--muted);cursor:pointer;font-size:14px;padding:0 4px}
  .anno-row .anno-x:hover{color:var(--danger)}
  /* scaling list */
  .scale-row{display:flex;align-items:center;gap:10px;padding:5px 0;font-size:12px;border-bottom:1px solid var(--border)}
  .scale-row .swatch{width:10px;height:10px;border-radius:3px;flex-shrink:0}
  .scale-row .snm{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .scale-row .mode-pick{display:inline-flex;border:1px solid var(--border);border-radius:6px;overflow:hidden}
  .scale-row .mode-pick button{background:var(--panel2);border:0;color:var(--muted);font-size:11px;padding:3px 9px;cursor:pointer;font-family:var(--font)}
  .scale-row .mode-pick button.active{background:var(--accent);color:#fff}
  .scale-row input[type=number]{width:74px;background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:3px 6px;font-size:11px;font-family:var(--mono)}
  .scale-row input:disabled{opacity:.4}
  .scale-row .rng-lbl{color:var(--muted);font-size:11px}
  .scale-row .yside{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:3px 6px;font-size:11px;font-family:var(--font)}

  /* ===== licensing bar (added by gate.js) ===== */
  .lic-bar{display:flex;align-items:center;gap:9px;padding:8px 16px;font-size:12px;border-bottom:1px solid var(--border);flex-shrink:0}
  .lic-bar .lic-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
  .lic-bar.demo{background:linear-gradient(90deg,rgba(210,153,34,.12),rgba(210,153,34,.04));}
  .lic-bar.demo .lic-dot{background:var(--warn);box-shadow:0 0 8px var(--warn)}
  .lic-bar.licensed{background:linear-gradient(90deg,rgba(63,185,80,.12),rgba(63,185,80,.03));}
  .lic-bar.licensed .lic-dot{background:var(--accent2);box-shadow:0 0 8px var(--accent2)}
  .lic-bar strong{color:var(--text);font-weight:600}
  .lic-bar .lic-sep{color:var(--muted)}
  .lic-bar .lic-note{color:var(--muted)}
  .lic-bar .lic-grow{flex:1}
  .lic-bar .lic-link{color:var(--accent);font-weight:600}
  .lic-bar .lic-cta{background:var(--accent);border:1px solid var(--accent);color:#fff;border-radius:6px;padding:4px 12px;font-size:12px;font-weight:600;cursor:pointer;font-family:var(--font)}
  .lic-bar .lic-cta:hover{filter:brightness(1.08)}
  /* locked upload buttons in demo mode */
  body.is-demo #uploadBtn.locked{background:var(--panel2);border-color:var(--warn);color:var(--warn)}
  body.is-demo #uploadBtn.locked:hover{border-color:var(--warn)}
  /* mock note inside unlock modal */
  .mock-note{margin-top:16px;padding-top:14px;border-top:1px dashed var(--border);font-size:12px;color:var(--muted)}
  .mock-note .mock-btn{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:4px 10px;font-size:12px;cursor:pointer;margin-left:4px;font-family:var(--font)}
  .mock-note .mock-btn:hover{border-color:var(--accent)}
  a.btn{ text-decoration:none; }