:root{--bg:#f4f6fb;--panel:#ffffff;--panel2:#eef1f8;--line:#d9deea;--text:#1b2233;--mut:#667089;--acc:#3b4fe0;--acc2:#0ea5a4;--accbg:#e6e9ff;--shadow:0 6px 24px rgba(30,40,80,.14);--paper:#ffffff;--stage:#e3e7f1}
:root[data-theme=dark]{--bg:#0e1424;--panel:#161d31;--panel2:#1d2640;--line:#2a3558;--text:#e6ebf8;--mut:#93a0c4;--acc:#7c8cff;--acc2:#2dd4bf;--accbg:#262f5a;--shadow:0 6px 24px rgba(0,0,0,.5);--stage:#0a0f1d}
*{box-sizing:border-box}html,body{height:100%;margin:0}
body{font:13px/1.35 Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);display:flex;flex-direction:column;overflow:hidden}
button,input,select,textarea{font:inherit;color:inherit}
header{display:flex;align-items:center;gap:10px;padding:6px 12px;background:var(--panel);border-bottom:1px solid var(--line);flex:0 0 auto}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:16px;letter-spacing:.2px}
.brand img{width:30px;height:30px}.brand small{font-weight:500;color:var(--mut);font-size:11px;margin-left:2px}
.menu{display:flex;gap:2px;margin-left:8px}
.mbtn{position:relative}
.mbtn>button,.hbtn{background:none;border:1px solid transparent;border-radius:7px;padding:5px 10px;cursor:pointer}
.mbtn>button:hover,.hbtn:hover{background:var(--panel2)}
.drop{display:none;position:absolute;left:0;top:100%;min-width:220px;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:4px;z-index:50}
.mbtn.open .drop{display:block}
.drop button{display:flex;justify-content:space-between;gap:20px;width:100%;text-align:left;background:none;border:0;padding:6px 10px;border-radius:6px;cursor:pointer}
.drop button:hover{background:var(--accbg)}.drop button span{color:var(--mut);font-size:11px}
.drop hr{border:0;border-top:1px solid var(--line);margin:4px 2px}
.spacer{flex:1}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.seg button{border:0;background:var(--panel);padding:5px 14px;cursor:pointer;font-weight:600}
.seg button.on{background:var(--acc);color:#fff}
main{flex:1;display:flex;min-height:0}
#tools{width:126px;flex:0 0 auto;background:var(--panel);border-right:1px solid var(--line);overflow-y:auto;padding:6px 5px}
#tools h6{margin:7px 3px 2px;font-size:10px;text-transform:uppercase;letter-spacing:.8px;color:var(--mut)}
.tgrid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:3px}
.tb{height:31px;border:1px solid var(--line);background:var(--panel);border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;font-weight:700;font-size:13px;color:var(--text)}
.tb:hover{background:var(--panel2)}.tb.on{background:var(--accbg);border-color:var(--acc);color:var(--acc)}
.tb svg{width:23px;height:23px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tb.wide{grid-column:span 3}
#stagewrap{flex:1;position:relative;min-width:0;background:var(--stage)}
#stage,#c3{position:absolute;inset:0;width:100%;height:100%;touch-action:none;display:block}
#c3{display:none}
body.m3 #c3{display:block}body.m3 #stage{display:none}body.m3 #tools .only2d{display:none}
#hint{position:absolute;left:10px;bottom:10px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:4px 9px;color:var(--mut);font-size:12px;pointer-events:none;box-shadow:var(--shadow);max-width:70%}
#zoomctl{position:absolute;right:10px;bottom:10px;display:flex;gap:3px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:2px;box-shadow:var(--shadow)}
#zoomctl button{border:0;background:none;width:26px;height:26px;border-radius:6px;cursor:pointer;font-size:15px}
#zoomctl button:hover{background:var(--panel2)}#zoomctl span{min-width:44px;text-align:center;font-size:12px;color:var(--mut)}
#labelin{position:absolute;display:none;z-index:20;border:2px solid var(--acc);border-radius:6px;padding:2px 6px;font:15px Arial,sans-serif;min-width:70px;background:#fff;color:#111;box-shadow:var(--shadow)}
#side{width:310px;flex:0 0 auto;background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.tabs{display:flex;border-bottom:1px solid var(--line)}
.tabs button{flex:1;border:0;background:none;padding:9px 4px;cursor:pointer;font-weight:600;color:var(--mut);border-bottom:2px solid transparent}
.tabs button.on{color:var(--acc);border-color:var(--acc)}
.pane{display:none;padding:12px;overflow-y:auto;flex:1}.pane.on{display:block}
.pane h4{margin:14px 0 6px;font-size:11px;text-transform:uppercase;letter-spacing:.8px;color:var(--mut)}.pane h4:first-child{margin-top:0}
.formula{font-size:22px;font-weight:700;letter-spacing:.3px}
.name{color:var(--acc2);font-weight:600;margin:2px 0 8px}
.kv{display:grid;grid-template-columns:auto 1fr;gap:3px 12px}.kv div:nth-child(odd){color:var(--mut)}.kv div:nth-child(even){text-align:right;font-variant-numeric:tabular-nums}
.bar{height:7px;border-radius:4px;background:var(--panel2);overflow:hidden;margin:2px 0 6px}.bar i{display:block;height:100%}
.comp{display:grid;grid-template-columns:34px 1fr 52px;gap:4px 8px;align-items:center}
.smi{display:flex;gap:4px}.smi input{flex:1;min-width:0}
input[type=text],input[type=number],select,textarea{background:var(--panel2);border:1px solid var(--line);border-radius:7px;padding:5px 7px;width:100%}
textarea{resize:vertical;min-height:90px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px}
.btn{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:6px 11px;cursor:pointer;font-weight:600}
.btn:hover{background:var(--panel2)}.btn.pri{background:var(--acc);border-color:var(--acc);color:#fff}.btn.pri:hover{filter:brightness(1.1)}
.btn.sm{padding:3px 8px;font-size:12px}
.row{display:flex;gap:6px;align-items:center;margin:5px 0}.row label{flex:0 0 96px;color:var(--mut)}.row>*:not(label){flex:1}
.row input[type=checkbox]{flex:0 0 auto}.row input[type=color]{height:28px;padding:1px;border:1px solid var(--line);border-radius:6px;background:none}
.btns{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0}
.note{color:var(--mut);font-size:12px}.warn{color:#c2410c;font-size:12px;margin:4px 0}
.meas{font-family:ui-monospace,Menlo,Consolas,monospace;background:var(--panel2);border-radius:8px;padding:6px 8px;min-height:34px}
footer{display:flex;gap:16px;padding:3px 12px;background:var(--panel);border-top:1px solid var(--line);color:var(--mut);font-size:12px;flex:0 0 auto}
.modal{position:fixed;inset:0;background:rgba(10,15,30,.55);display:none;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal.on{display:flex}
.card{background:var(--panel);border-radius:14px;box-shadow:var(--shadow);width:min(900px,100%);max-height:90vh;display:flex;flex-direction:column;border:1px solid var(--line)}
.card header{border:0;border-bottom:1px solid var(--line);border-radius:14px 14px 0 0}.card header h3{margin:0;flex:1;font-size:15px}
.card .body{padding:14px;overflow:auto}
.libgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:8px}
.lcard{border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;padding:4px;text-align:center;color:#222}
.lcard:hover{border-color:var(--acc);box-shadow:0 0 0 2px var(--accbg)}.lcard canvas{width:100%;height:84px;display:block}.lcard div{font-size:11px;padding:2px 2px 3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cat{margin:12px 0 6px;font-weight:700;color:var(--mut);font-size:11px;text-transform:uppercase;letter-spacing:.8px}
.help h3{margin:14px 0 4px}.help kbd{background:var(--panel2);border:1px solid var(--line);border-radius:4px;padding:0 5px;font-size:11px}
.help table{border-collapse:collapse;width:100%}.help td{padding:3px 8px;border-bottom:1px solid var(--line)}
#toast{position:fixed;left:50%;bottom:44px;transform:translateX(-50%);background:#111827;color:#fff;border-radius:9px;padding:8px 14px;display:none;z-index:200;box-shadow:var(--shadow)}
@media(max-width:860px){#side{position:absolute;right:0;top:0;bottom:0;z-index:30;width:min(320px,92vw);box-shadow:var(--shadow);transform:translateX(100%);transition:transform .2s}#side.open{transform:none}#tools{width:112px}.hide-s{display:none}}
@media(min-width:861px){#sidebtn{display:none}}