:root{--ink:#203b3b;--muted:#72817b;--green:#187567;--orange:#d47b38;--line:#dfe6df;--bg:#f3f5ee}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}header{display:flex;align-items:center;gap:20px;padding:20px 4%;border-bottom:1px solid var(--line);background:#fafbf6}.brand{color:var(--ink);font-size:22px;font-weight:750;text-decoration:none}.brand small{font-size:10px;letter-spacing:2px;margin-left:12px}header>span{flex:1;color:var(--muted)}main{max-width:1550px;margin:auto;padding:32px 4%}.intro{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:28px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:var(--green)}h1{font-size:36px;letter-spacing:-1px;line-height:1.3;margin:8px 0}h2{font-size:19px;margin:4px 0 14px}.intro p{color:var(--muted);margin:10px 0}.intro label{min-width:285px}button,.button,select,input{font:inherit;border:1px solid #d4ddd4;border-radius:7px;background:#fff;color:var(--ink);padding:8px 11px}button,.button{cursor:pointer;white-space:nowrap}button:hover,.button:hover{border-color:var(--green);background:#edf5ef}button.active,.primary{background:var(--green);color:white;border-color:var(--green)}button:disabled{opacity:.4;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--orange);outline-offset:2px}label{display:block;color:var(--muted);font-size:12px}label input,label select{display:block;width:100%;margin:6px 0 12px;color:var(--ink)}.modebar{display:flex;align-items:center;gap:16px;border-top:1px solid var(--line);padding:18px 0 24px}.tabs{display:flex;gap:5px}.modebar p{flex:1;font-size:12px;color:var(--muted)}.workspace{display:grid;grid-template-columns:355px minmax(0,1fr);gap:22px}.panel{padding:22px;background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:20px;overflow:hidden}.panelhead,.modelhead,.editorfoot{display:flex;align-items:center;justify-content:space-between;gap:8px}.panelhead h2{margin-bottom:12px}.tools{display:flex;gap:4px}.tools button{flex:1;font-size:12px;padding:7px}.editor{padding:18px}.editor canvas{height:315px;touch-action:none;cursor:crosshair}.editorfoot{font-size:10px}.editorfoot button{padding:2px 7px}.pole{color:var(--green)}.zero{color:var(--orange)}.linked{color:var(--orange)}.hint{font-size:11px;color:var(--muted);line-height:1.7}.numbergrid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.numbergrid input{min-width:0}.row{display:flex;gap:4px}.row button{padding:6px;font-size:11px}.rootlist{display:flex;flex-wrap:wrap;gap:5px;margin-top:12px}.rootlist button{font:11px monospace;padding:4px 6px}.full{width:100%}.formula{font-family:ui-monospace,monospace;font-size:13px;background:#f2f6f1;padding:14px;border-radius:8px;overflow-wrap:anywhere}.summary p{font-size:13px}.badge{font-size:11px;padding:5px 9px;border-radius:20px;background:#e7f3eb}.badge.bad{background:#fff0e5;color:#b55821}.metrics{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}.metrics>div{padding-right:20px;min-width:120px}.metrics b{font-size:21px;display:block;font-weight:550}.metrics small{color:var(--muted)}canvas{width:100%;height:230px;display:block}#phase{height:195px}.plotgrid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.plotgrid canvas{height:265px}.legend{font-size:11px;color:var(--green)}.learning{padding:18px 4px}.learning>div{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.learning p{font-size:12px;color:var(--muted)}.learning b{display:inline-block;color:var(--ink);margin-bottom:8px}footer{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding:25px 0;margin-top:20px}#error{background:#ffebdc;color:#9b411b;border:1px solid #e9b68f;padding:12px 18px;margin-bottom:18px;border-radius:8px}[hidden]{display:none!important}@media(max-width:1050px){.workspace{grid-template-columns:310px minmax(0,1fr)}.plotgrid{grid-template-columns:1fr}.modebar{flex-wrap:wrap}.modebar p{min-width:220px}}@media(max-width:760px){header{flex-wrap:wrap;gap:10px}header>span{display:none}.brand{flex:1}.brand small{display:none}main{padding:22px 15px}.intro{display:block}h1{font-size:29px}.intro label{margin-top:20px}.workspace{display:block}.learning>div{grid-template-columns:1fr;gap:0}.modebar{gap:8px}.modebar p{order:3;margin:2px 0}.editor canvas{height:340px}.plotgrid{gap:0}.panel{padding:17px}}

/* Selected chart sits at the same level as the editor. */
.viewbar{display:flex;align-items:center;gap:14px;padding:0 0 20px;flex-wrap:wrap}.viewbar label{font-size:13px;color:var(--ink)}.viewbar select{min-width:240px}.viewbar span{font-size:12px;color:var(--muted)}
.single-plot .workspace>article{display:flex;flex-direction:column;min-width:0}
.single-plot #summaryPanel{order:2}.single-plot .learning{order:3;display:none}
.single-plot #openPlots{grid-template-columns:1fr;gap:0}
.single-plot #locus,.single-plot #nyquist,.single-plot #step{height:430px}
.single-plot #magnitude{height:220px}.single-plot #phase{height:210px}
@media(min-width:761px){.single-plot .editor{position:sticky;top:14px;z-index:2}.single-plot .workspace>aside{align-self:start}}
@media(max-width:760px){.single-plot .workspace{display:grid;grid-template-columns:minmax(0,1fr);gap:14px}.single-plot .workspace>aside{display:contents}.single-plot .editor{order:0;margin-bottom:0}.single-plot .workspace>article{order:1}.single-plot .workspace>aside>.panel:not(.editor){order:2}.single-plot #editor{height:240px}.single-plot #locus,.single-plot #nyquist,.single-plot #step{height:300px}.viewbar select{width:100%}.single-plot #magnitude,.single-plot #phase{height:185px}}

.margin-summary{display:flex;gap:12px;margin:0 0 10px;flex-wrap:wrap}.margin-summary>div{flex:1;min-width:190px;padding:10px 14px;background:#f6f7f1;border-radius:8px}.margin-summary small,.margin-summary span{display:block;font-size:10px}.margin-summary b{font-size:22px;display:block;font-weight:600}.pm-value{color:#7861a7}.gm-value{color:#b96627}.margin-summary span{color:var(--muted)}#marginDetails{font-size:11px;color:var(--muted)}#marginDetails summary{cursor:pointer}.margin-table{overflow-x:auto;margin-top:10px}.margin-table table{width:100%;border-collapse:collapse;text-align:left}.margin-table td,.margin-table th{padding:7px;border-bottom:1px solid var(--line);white-space:nowrap}

#closedBodePanel .legend{color:#3975a0}#closedPhase{height:195px}.single-plot #closedMagnitude{height:220px}.single-plot #closedPhase{height:210px}@media(max-width:760px){.single-plot #closedMagnitude,.single-plot #closedPhase{height:185px}}

.stepcontrols{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:9px}.stepcontrols label{flex:1;min-width:135px}.stepcontrols input{margin:3px 0}.stepcontrols button{font-size:11px;padding:7px}.time-slider input{width:100%;accent-color:var(--green)}#settlingInfo{padding:7px 10px;background:#f2f6ef;border-radius:6px}#locusScale,#nyquistScale{margin:4px 0 0}#locusScaleNote:empty,#nyquistScaleNote:empty{display:none}