/* Shared schematic palette: amber, cyan, and violet retain their physical meanings.
   A quiet navy surface keeps labels and motion readable. Numerals use monospace;
   UI text uses the system font, and equation variables are italic. */
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{background:#0A0E14;color:#E8EDF2;font:14px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}
.num,.oval,.tk,input[type=number],select{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
#app{display:grid;grid-template-columns:minmax(0,62fr) minmax(360px,38fr);height:100vh}
#stageWrap{position:relative;min-width:0;min-height:0}
#cv{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:pan-y}
#rail{overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:12px;border-left:1px solid #1E2836;background:#0C1118}
#rail>*{flex-shrink:0}
#demoTabs{display:flex;gap:6px;padding:0 2px;flex-wrap:wrap}
#demoTabs button{font:600 10.5px ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.12em;color:#7f8ea3;background:#10151E;border:1px solid #1E2836;border-radius:7px;padding:8px 14px;min-height:34px;cursor:pointer;transition:color .15s,border-color .15s}
#demoTabs button:hover{color:#E8EDF2}
#demoTabs button.active{color:#E8EDF2;border-color:#5FD4F4;box-shadow:0 0 8px rgba(95,212,244,.22)}
#brand{font-size:12px;letter-spacing:.14em;color:#7f8ea3;padding:2px 2px 0}
#brand b{color:#E8EDF2;letter-spacing:.22em}
.panel{background:#10151E;border:1px solid #1E2836;border-radius:10px;padding:12px 14px}
.panel h3{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:#7f8ea3;font-weight:600;margin-bottom:8px}
/* ---- scrubber ---- */
#scrubBox{padding:10px 14px 8px}
#ticks{position:relative;height:20px;margin:0 11px 2px}
.tk{position:absolute;top:0;transform:translateX(-50%);font-size:10px;color:#7f8ea3;text-align:center;white-space:nowrap;user-select:none}
.tk i{display:block;width:2px;height:5px;background:#3a4a5e;margin:2px auto 0;font-style:normal}
#scrub{-webkit-appearance:none;appearance:none;display:block;width:100%;height:44px;background:transparent;touch-action:none;cursor:pointer;--fill:0%}
#scrub::-webkit-slider-runnable-track{height:6px;border-radius:3px;background:linear-gradient(to right,#5FD4F4 var(--fill),#1E2836 var(--fill))}
#scrub::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#E8EDF2;border:2px solid #5FD4F4;margin-top:-8px;box-shadow:0 0 0 4px rgba(95,212,244,.14)}
#scrub::-moz-range-track{height:6px;border-radius:3px;background:linear-gradient(to right,#5FD4F4 var(--fill),#1E2836 var(--fill))}
#scrub::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#E8EDF2;border:2px solid #5FD4F4}
#scrub:focus-visible{outline:2px solid #5FD4F4;outline-offset:2px;border-radius:6px}
#transport{display:flex;align-items:center;gap:12px;margin-top:2px}
#playBtn{width:44px;height:38px;border-radius:8px;background:#0A0E14;border:1px solid #1E2836;color:#5FD4F4;font-size:15px;cursor:pointer;flex:0 0 auto}
#playBtn:hover{border-color:#5FD4F4}
#transport label{display:flex;align-items:center;gap:6px;font-size:12px;color:#93a4b8;cursor:pointer}
#transport input[type=checkbox]{accent-color:#5FD4F4;width:15px;height:15px}
.scene-controls{display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;border-top:1px solid #263449;margin-top:12px;padding-top:10px}
.scene-controls button{min-height:34px;padding:5px 10px;border:1px solid #3a526f;border-radius:7px;background:#132239;color:#dcecff;font:500 12px system-ui;cursor:pointer}
.scene-controls button:hover{background:#1b304e;border-color:#7fb4d9}
.scene-controls label{display:flex;align-items:center;gap:6px;font-size:12px;color:#b7c8dd}
.scene-controls select{width:66px;min-height:34px;padding:4px 6px;font-size:12px}
.scene-controls input{accent-color:#5fd4f4;width:15px;height:15px}
.scene-controls :focus-visible{outline:2px solid #5fd4f4;outline-offset:3px}
#keyHint{margin-left:auto;font-size:10.5px;color:#556274;white-space:nowrap}
/* ---- prose ---- */
#stageTitle{font-size:13px;font-weight:600;letter-spacing:.06em;color:#E8EDF2;margin-bottom:5px}
#stageTitle .num{color:#5FD4F4;margin-right:6px}
#prose{font-size:13.5px;line-height:1.65;color:#c6d0dc;transition:opacity .2s ease}
#prose.fading{opacity:0}
/* ---- equations ---- */
#eqBox{min-height:132px}
.eqcap{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:#7f8ea3;margin:8px 0 3px}
.eqcap:first-child{margin-top:0}
.eqline{font-size:15.5px;line-height:1.5;padding:4px 0;opacity:0;transition:opacity .25s ease;display:block;overflow-wrap:anywhere}
.eqline.on{opacity:1}
.eqline.indent{padding-left:14px}
.var{font-style:italic}
.var sub,.num sub{font-size:.68em}
.op{padding:0 4px;color:#9fb0c2}
.unit{color:#93a4b8;padding-left:5px;font-size:.86em;font-style:normal}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 4px;line-height:1.35}
.frac>.fn{padding:0 5px}
.frac>.fd{border-top:1px solid #E8EDF2;padding:0 5px}
.cW{color:#FFB454}.cT{color:#5FD4F4}.cA{color:#C792EA}.cS{color:#7FB4D9}
#eqBox .num[data-term^="pvc"],#eqBox .pvcNum,
#eqBox .num[data-term^="tn"],#eqBox .tnNum,
#eqBox .num[data-term^="gy"],#eqBox .gyNum{white-space:nowrap;display:inline-block}
.chk{color:#5FD4F4;font-weight:700;padding-left:6px}
[data-term]{border-radius:3px;cursor:pointer;transition:filter .15s}
[data-term].hl{text-shadow:0 0 8px currentColor;background:rgba(255,255,255,.055);filter:brightness(1.22)}
/* ---- given values ---- */
.prow{display:grid;grid-template-columns:minmax(64px,max-content) minmax(0,1fr) 54px;gap:8px;align-items:center;margin:7px 0}
.prow.pg{grid-template-columns:minmax(64px,max-content) minmax(0,1fr) minmax(70px,84px) 54px}
.prow.ps{grid-template-columns:minmax(64px,max-content) minmax(0,1fr)}
.prow.ps input,.prow.ps .unit{display:none}
.prow label{font-style:italic;font-size:14px}
.prow .unit{font-size:12px;padding:0}
input[type=number],select{width:100%;background:#0A0E14;border:1px solid #1E2836;color:#E8EDF2;border-radius:6px;padding:6px 8px;font-size:13px;min-height:34px}
input[type=number]:focus,select:focus{outline:none;border-color:#5FD4F4}
input[type=number].flash{border-color:#FF5F56;box-shadow:0 0 0 2px rgba(255,95,86,.28)}
input[type=number]{-moz-appearance:textfield}
/* ---- outputs ---- */
.orow{display:flex;justify-content:space-between;align-items:baseline;padding:4px 1px;border-bottom:1px dashed #1a2330;gap:10px}
.orow:last-child{border-bottom:none}
.orow .olab{font-size:12.5px;color:#93a4b8}
.orow .olab .var{color:#c6d0dc}
.orow .oval{font-size:13.5px}
.orow.off{display:none}
#motSep{border-top:1px solid #1E2836;margin:6px 0 2px}
#motSep.off{display:none}
/* ---- mobile ---- */
@media (max-width:959px){
  #app{display:block;height:auto}
  #stageWrap{width:100%;aspect-ratio:4/3}
  #rail{border-left:none;overflow:visible;padding:10px}
  #demoTabs button{min-height:40px;flex:1}
  #scrubBox{position:sticky;top:0;z-index:30;box-shadow:0 8px 16px rgba(0,0,0,.45);background:#10151E}
  #keyHint{display:none}
}
@media (max-width:480px){
  #stageWrap{aspect-ratio:auto;height:clamp(360px,100vw,460px)}
  .prow.pg:not(.ps){grid-template-columns:minmax(64px,max-content) minmax(0,1fr) 54px}
  .prow.pg:not(.ps)>label{grid-row:1/3}
  .prow.pg:not(.ps)>select{grid-column:2/4;grid-row:1}
  .prow.pg:not(.ps)>input{grid-column:2;grid-row:2}
  .prow.pg:not(.ps)>.unit{grid-column:3;grid-row:2}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms!important;animation:none!important}
}

/* ================= SITE SHELL (home + category views) ================= */
#site{position:fixed;inset:0;background:#0A0E14;z-index:40;overflow-y:auto;display:none}
#site.on{display:block}
.siteWrap{max-width:1060px;margin:0 auto;padding:34px 26px 70px}
.hero{margin:26px 0 8px}
.hero h1{font-size:44px;letter-spacing:0.22em;margin:0;color:#E8EDF2;font-weight:700}
.hero h1 .fx{color:#FFB454}
.hero p{color:#93a4b8;margin:8px 0 0;font-size:15px;max-width:560px}
.heroRule{height:1px;background:linear-gradient(90deg,#FFB454,#5FD4F4,#C792EA,transparent);margin:22px 0 30px;opacity:0.55}
.cgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.card{background:#10151E;border:1px solid #1E2836;border-radius:10px;padding:0;cursor:pointer;
  transition:border-color .18s,transform .18s;text-align:left;color:inherit;font:inherit;display:block;width:100%}
.card:hover{border-color:#FFB454;transform:translateY(-2px)}
.card canvas{display:block;width:100%;height:118px;border-radius:9px 9px 0 0;background:#0C1119}
.cbody{padding:13px 15px 15px}
.card h3{margin:0 0 3px;font-size:15px;letter-spacing:0.09em;color:#E8EDF2}
.card .sub{color:#93a4b8;font-size:12.5px;line-height:1.45}
.card .meta{margin-top:9px;font-size:11px;color:#5FD4F4;letter-spacing:0.06em;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.crumb{display:inline-block;margin:4px 0 18px;color:#5FD4F4;cursor:pointer;background:none;border:none;
  font:inherit;font-size:13px;letter-spacing:0.05em;padding:0}
.crumb:hover{color:#FFB454}
.catHead h2{margin:0;font-size:26px;letter-spacing:0.14em;color:#E8EDF2}
.catHead p{color:#93a4b8;margin:6px 0 24px;font-size:14px}
.mgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
#demoTabs .home{color:#FFB454;border-color:#2a3648}
@media (max-width:640px){.hero h1{font-size:32px}.siteWrap{padding:22px 16px 60px}}

#related{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:2px 0 4px;min-height:0}
#related:empty{display:none}
#related .rlbl{font-size:10px;letter-spacing:0.12em;color:#93a4b8}
#related .chip{background:#10151E;border:1px solid #1E2836;border-radius:20px;color:#5FD4F4;
  font:inherit;font-size:10.5px;letter-spacing:0.07em;padding:2px 10px;cursor:pointer}
#related .chip:hover{border-color:#5FD4F4}
.card .dot{color:#FFB454;font-size:9px;vertical-align:2px;margin-left:6px}
.resume{display:inline-block;margin-top:14px;background:#10151E;border:1px solid #2a3648;border-radius:20px;
  color:#FFB454;font:inherit;font-size:12px;letter-spacing:0.09em;padding:5px 15px;cursor:pointer}
.resume:hover{border-color:#FFB454}

.lawHead{margin:34px 0 10px;font-size:12px;letter-spacing:0.16em;color:#93a4b8}
.lawStrip{display:flex;flex-wrap:wrap;gap:8px}
.lchip{color:#C792EA}
.lchip:hover{border-color:#C792EA}
.lawline{font-style:italic;color:#93a4b8;max-width:640px}
#related .lsep{margin-left:10px}

#siteSearch{display:block;width:100%;max-width:560px;margin:0 0 22px;padding:10px 14px;
  background:#0d1420;border:1px solid #253349;border-radius:8px;color:#dce6f2;
  font:inherit;font-size:14px;letter-spacing:0.02em;outline:none}
#siteSearch:focus{border-color:#5FD4F4}
#siteSearch::placeholder{color:#5d6f85}
#searchEmpty{color:#93a4b8;font-style:italic;margin:6px 0 26px}
.tchip{color:#FFB454}
.tchip:hover{border-color:#FFB454}
.tourStep{position:relative}
.tourStep .stepN{position:absolute;top:-9px;left:-9px;z-index:2;width:24px;height:24px;
  border-radius:50%;background:#FFB454;color:#101623;font-weight:700;font-size:13px;
  display:flex;align-items:center;justify-content:center;box-shadow:0 0 0 3px #101623}
.tourStep .card{width:100%}
#copyLink{margin-left:14px;padding:3px 10px;background:transparent;border:1px solid #253349;
  border-radius:6px;color:#93a4b8;font:inherit;font-size:11.5px;letter-spacing:0.06em;cursor:pointer}
#copyLink:hover{border-color:#5FD4F4;color:#dce6f2}

.visuallyHidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}
#tourNav{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:0 0 10px;padding:7px 10px;
  background:#0d1420;border:1px solid #2a3a2a;border-left:3px solid #FFB454;border-radius:6px}
#tourNav .tnPart{background:transparent;border:none;color:#FFB454;font:inherit;font-size:12px;
  letter-spacing:0.06em;cursor:pointer;padding:2px 4px}
#tourNav .tnPart:hover{text-decoration:underline}
#tourNav .tnStep{color:#93a4b8;font-size:12px}
#tourNav .tnNext{margin-left:auto;border:1px solid #3a3020;border-radius:5px;padding:3px 10px}
#tourNav .tnNext:hover{border-color:#FFB454;text-decoration:none}