html,body.tool{height:100%}
body.tool{display:flex;flex-direction:column;overflow:hidden;background:var(--bg)}
body.tool .top{width:100%;max-width:none;padding:8px 14px;flex:0 0 auto}
body.tool .top nav a{padding:5px 9px;font-size:14px}
#ckt{flex:1 1 auto;min-height:0;display:grid;grid-template-columns:168px minmax(0,1fr) 300px;grid-template-rows:auto minmax(0,1fr);grid-template-areas:"bar bar bar" "parts stage side"}
.bar{grid-area:bar;display:flex;align-items:center;gap:6px;padding:6px 10px;background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap}
.bar button,.bar select,.pname{font:600 13px system-ui,sans-serif;color:var(--fg);background:#1d2029;border:1px solid var(--line);border-radius:8px;padding:6px 10px;cursor:pointer;min-height:32px}
.bar button:hover:not(:disabled){border-color:#4a5266;background:#222633}
.bar button:disabled{opacity:.35;cursor:default}
.bar button.primary{background:#1fa855;border-color:#1fa855;color:#fff}.bar button.primary:hover:not(:disabled){background:#25c063}
.bar button.primary.running{background:#2a2f3a;border-color:var(--line);color:var(--muted)}
.bar .sep{width:1px;height:22px;background:var(--line);flex:0 0 1px;margin:0 2px}
.bar .sel{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:13px}
.pname{cursor:text;width:150px;font-weight:700}
#parts{grid-area:parts;background:var(--panel);border-right:1px solid var(--line);padding:10px;overflow-y:auto}
#side{grid-area:side;background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
#ckt h2{margin:0 0 8px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
#ckt h3{margin:12px 0 4px;font-size:12px;color:var(--muted);font-weight:700}
.hint{font-size:12.5px;color:var(--muted);line-height:1.45}
#partgrid{display:grid;grid-template-columns:1fr 1fr;gap:6px}
#partgrid button{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:2px;padding:6px 2px 6px;background:#1d2029;border:1px solid var(--line);border-radius:10px;color:var(--fg);font:600 11.5px system-ui,sans-serif;cursor:grab;min-height:70px}
#partgrid button:hover{border-color:var(--cyan)}
#partgrid svg{width:100%;height:42px}
#stage{grid-area:stage;position:relative;min-width:0;min-height:0;background:#0d1017;overflow:hidden}
#svg{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;outline:none;cursor:grab;user-select:none;-webkit-user-select:none}
#svg.panning{cursor:grabbing}
#svg .part{cursor:move}#svg .ctl{cursor:pointer}
#svg .tg{cursor:crosshair}
#svg .term{fill:#ffd23a;stroke:#0b0c10;stroke-width:1.5;cursor:crosshair}
#svg .term:hover,#svg .term.hot{fill:#fff;stroke:var(--cyan);stroke-width:3}
#svg .wirehit{stroke:transparent;stroke-width:14;fill:none;cursor:pointer}
#svg .wire{fill:none;stroke-width:4;stroke-linecap:round;pointer-events:none}
#svg .wireout{fill:none;stroke:#000;stroke-opacity:.45;stroke-width:7;stroke-linecap:round;pointer-events:none}
#svg .wire.sel{stroke-dasharray:1 0}
#svg .selbox{fill:none;stroke:var(--cyan);stroke-width:1.5;stroke-dasharray:5 4;pointer-events:none}
#svg text{font-family:system-ui,sans-serif;pointer-events:none}
#tip{position:absolute;pointer-events:none;background:rgba(11,12,16,.92);border:1px solid var(--line);border-radius:8px;padding:3px 9px;font:600 12px ui-monospace,Menlo,monospace;color:var(--cyan);z-index:4;white-space:nowrap}
#toast{position:absolute;left:50%;top:14px;transform:translateX(-50%);background:#15181f;border:1px solid var(--line);border-left:3px solid var(--amber);border-radius:10px;padding:8px 14px;font-size:13px;max-width:90%;z-index:6}
#welcome{position:absolute;left:12px;top:12px;max-width:310px;background:rgba(21,24,31,.95);border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:13px;display:flex;flex-direction:column;gap:6px;z-index:3}
#welcome span{color:var(--muted);line-height:1.45}#welcome u{color:var(--fg);text-decoration:none;font-weight:700}
#welcome button{align-self:flex-start;background:var(--red);color:#fff;border:0;border-radius:8px;padding:5px 12px;font-weight:700;cursor:pointer}
#warn{position:absolute;right:12px;top:12px;max-width:330px;display:flex;flex-direction:column;gap:6px;z-index:5}
#warn div{background:rgba(60,18,20,.95);border:1px solid #7a2a2f;border-left:4px solid var(--red2);border-radius:10px;padding:7px 11px;font-size:13px;color:#ffd7d9}
#warn div.info{background:rgba(18,40,60,.95);border-color:#2a5a7a;border-left-color:var(--cyan);color:#cfeaf5}
#cons{position:absolute;left:0;right:0;bottom:0;background:rgba(11,12,16,.92);border-top:1px solid var(--line);z-index:2}
#cons .chead{display:flex;justify-content:space-between;align-items:center;padding:3px 10px;font-size:12px;color:var(--muted);cursor:pointer}
#cons .chead button{background:none;border:0;color:var(--muted);cursor:pointer;font-size:12px}
#clog{margin:0;height:84px;overflow:auto;border:0;border-radius:0;background:transparent;padding:2px 10px 6px;font-size:12.5px;color:#9be3a0;display:none}
#cons.open #clog{display:block}
.tabs{display:flex;border-bottom:1px solid var(--line);flex:0 0 auto}
.tabs button{flex:1;background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);padding:9px 4px;font:700 13px system-ui,sans-serif;cursor:pointer}
.tabs button.on{color:var(--fg);border-bottom-color:var(--red)}
.pane{padding:10px 12px;overflow-y:auto;flex:1 1 auto;min-height:0;display:flex;flex-direction:column;gap:8px}
.pane[hidden]{display:none}
#code{flex:1;min-height:200px;resize:none;background:#07080b;color:#e6e9ef;border:1px solid var(--line);border-radius:10px;padding:10px;font:13px/1.55 ui-monospace,"JetBrains Mono",Menlo,monospace;tab-size:2;white-space:pre;overflow:auto}
#code:focus{outline:2px solid var(--cyan);outline-offset:1px}
.api{font-size:12px;line-height:1.5}
.row{display:flex;align-items:center;gap:8px;margin:0 0 10px;font-size:13px;color:var(--muted)}
.row select,.row input[type=text]{flex:1;min-width:0;background:#0f1218;color:var(--fg);border:1px solid var(--line);border-radius:7px;padding:5px 7px;font:13px system-ui,sans-serif}
.row input[type=range]{flex:1}
.btnrow{display:flex;gap:6px;flex-wrap:wrap}
.btnrow button{background:#1d2029;color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:6px 12px;font:600 13px system-ui,sans-serif;cursor:pointer}
.btnrow button.danger{border-color:#7a2a2f;color:#ff8b92}
.sw{display:flex;gap:6px;flex-wrap:wrap}.sw button{width:26px;height:26px;border-radius:50%;border:2px solid transparent;cursor:pointer;padding:0}.sw button.on{border-color:#fff}
kbd{background:#1d2029;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 5px;font:11px ui-monospace,monospace;color:var(--fg)}
.mtabs{display:none}
[hidden]{display:none!important}
@media(max-width:900px){
  body.tool .top{padding:6px 10px}body.tool .top nav{display:none}
  #ckt{grid-template-columns:minmax(0,1fr);grid-template-areas:"bar" "stage"}
  .bar{flex-wrap:nowrap;overflow-x:auto;white-space:nowrap}
  #parts,#side{position:absolute;left:0;right:0;bottom:46px;max-height:52%;z-index:7;border:0;border-top:1px solid var(--line);display:none;grid-area:auto}
  #ckt.show-parts #parts,#ckt.show-side #side{display:flex;flex-direction:column}
  #ckt.show-parts #parts{display:block}
  #partgrid{grid-template-columns:repeat(4,1fr)}
  .mtabs{display:flex;position:absolute;left:0;right:0;bottom:0;height:46px;background:var(--panel);border-top:1px solid var(--line);z-index:8}
  .mtabs button{flex:1;background:none;border:0;color:var(--fg);font-weight:700;font-size:14px}
  #cons{bottom:46px}#welcome{max-width:calc(100% - 24px)}#warn{max-width:calc(100% - 24px)}
  .pname{width:110px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

#psearch{width:100%;box-sizing:border-box;margin:0 0 8px;background:#0f1218;color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:6px 9px;font:13px system-ui,sans-serif}
#partgrid h4{grid-column:1/-1;margin:8px 0 0;font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
#partgrid h4:first-child{margin-top:0}
#partgrid [hidden]{display:none}
#lesson{position:absolute;left:12px;bottom:40px;max-width:340px;background:rgba(21,24,31,.96);border:1px solid var(--line);border-left:3px solid var(--cyan);border-radius:12px;padding:10px 12px;font-size:13px;display:flex;flex-direction:column;gap:5px;z-index:3}
#lesson b{font-size:14px}#lesson span{color:#c3c8d4;line-height:1.5}
#lesson button{align-self:flex-start;background:#1d2029;color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:4px 12px;font-weight:700;cursor:pointer}
.snip{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted)}
.snip select{flex:1;min-width:0;background:#0f1218;color:var(--fg);border:1px solid var(--line);border-radius:7px;padding:5px 7px;font:13px system-ui,sans-serif}
.row input[type=checkbox]{width:18px;height:18px;accent-color:#e8590c}
@keyframes tpspin{to{transform:rotate(360deg)}}
@media(max-width:900px){#lesson{max-width:calc(100% - 24px)}}
#lesson{cursor:pointer}#lesson.min{max-width:220px;padding:6px 12px}#lesson.min span,#lesson.min button{display:none}#lesson.min b:after{content:'  ⓘ';color:var(--cyan)}