/* ============================================================
   LIGHTSTRUC AI — technical-blueprint personal site
   Palette drawn from AI_Structural_Blueprint.pdf:
   paper #F3EFE2 · ink #23282E · navy #3E5A74 · copper #B06A38 · sage #9DB48C
   ============================================================ */
:root{
  --paper:#F3EFE2;
  --paper-lt:#FAF7EC;
  --ink:#23282E;
  --ink-soft:#4A5259;
  --navy:#3E5A74;
  --copper:#B06A38;
  --sage:#9DB48C;
  --sage-dk:#7E9873;
  --grid:rgba(80,100,120,.10);
  --grid-major:rgba(80,100,120,.16);
  --rule:#8A9099;
  --mono:"Cascadia Mono",ui-monospace,"SF Mono",Menlo,Consolas,"Courier New",monospace;
  --sans:-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:
    repeating-linear-gradient(0deg,transparent 0 23px,var(--grid) 23px 24px),
    repeating-linear-gradient(90deg,transparent 0 23px,var(--grid) 23px 24px),
    repeating-linear-gradient(0deg,transparent 0 119px,var(--grid-major) 119px 120px),
    repeating-linear-gradient(90deg,transparent 0 119px,var(--grid-major) 119px 120px),
    var(--paper);
  line-height:1.55;
  display:flex;flex-direction:column;
  overflow:hidden;
}
::selection{background:var(--sage);color:var(--ink)}

/* ---------- header & horizontal menu ---------- */
header{
  flex:0 0 auto;
  border-bottom:2px solid var(--ink);
  background:linear-gradient(rgba(250,247,236,.92),rgba(250,247,236,.92));
  z-index:50;
}
.masthead{
  max-width:1160px;margin:0 auto;padding:14px 24px 0;
  display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;
}
.wordmark{font-family:var(--mono);font-size:1.35rem;font-weight:700;letter-spacing:.02em}
.wordmark .tick{color:var(--copper)}
.masthead-photo{
  margin-left:auto;align-self:center;flex-shrink:0;
  width:52px;height:52px;border-radius:50%;overflow:hidden;
  transition:opacity .15s ease;
}
.masthead-photo:hover{opacity:.85}
.masthead-photo:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.masthead-photo img{display:block;width:100%;height:100%;object-fit:cover}
nav{max-width:1160px;margin:0 auto;padding:6px 24px 0;display:flex;gap:2px;flex-wrap:wrap}
nav a{
  font-family:var(--mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;
  text-decoration:none;color:var(--ink-soft);
  padding:8px 16px 10px;border:1px solid transparent;border-bottom:none;
  position:relative;top:1px;
}
nav a:hover{color:var(--ink);background:rgba(157,180,140,.18)}
nav a.active{
  color:var(--ink);background:var(--paper);
  border-color:var(--ink);
  border-top:2px solid var(--copper);
}
nav a:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

/* ---------- nav dropdown (Engineering, Tools) ---------- */
.nav-dropdown{position:relative;display:inline-block}
.nav-dropdown-toggle{
  font-family:var(--mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);background:none;border:1px solid transparent;border-bottom:none;
  padding:8px 14px 10px 16px;position:relative;top:1px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;
}
.nav-dropdown-toggle:hover{color:var(--ink);background:rgba(157,180,140,.18)}
.nav-dropdown-toggle:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}
.nav-dropdown-toggle .caret{font-size:.6rem;color:var(--copper);transition:transform .15s ease}
.nav-dropdown.open .nav-dropdown-toggle .caret{transform:rotate(180deg)}
.nav-dropdown-toggle.dd-active,.nav-dropdown.open .nav-dropdown-toggle{
  color:var(--ink);background:var(--paper);border-color:var(--ink);border-top:2px solid var(--copper);
}
.nav-dropdown-menu{
  display:none;flex-direction:column;position:absolute;top:100%;left:0;min-width:230px;
  background:var(--paper-lt);border:1px solid var(--ink);box-shadow:3px 4px 0 rgba(35,40,46,.14);
  z-index:60;
}
.nav-dropdown.open .nav-dropdown-menu{display:flex}
.nav-dropdown-menu a{
  font-family:var(--mono);font-size:.74rem;letter-spacing:.04em;text-transform:uppercase;
  color:var(--ink-soft);text-decoration:none;padding:10px 16px;border-bottom:1px dashed var(--rule);
  display:flex;align-items:baseline;gap:9px;
}
.nav-dropdown-menu a:last-child{border-bottom:none}
.nav-dropdown-menu a:hover{background:rgba(157,180,140,.18);color:var(--ink)}
.nav-dropdown-menu a.active{
  color:var(--ink);background:rgba(176,106,56,.08);
  border-left:3px solid var(--copper);padding-left:13px;
}
.nav-dropdown-menu a .idx{font-size:.64rem;color:var(--copper);letter-spacing:.05em}
.nav-dropdown-menu a:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

/* ---------- page containers ---------- */
main{flex:1 1 auto;min-height:0;overflow-y:auto;scroll-behavior:smooth;max-width:1160px;width:100%;margin:0 auto;padding:34px 24px 40px}
.page{display:none}
.page.active{display:block;animation:reveal .35s ease}
@keyframes reveal{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.page.active{animation:none}}

/* ---------- drawing "plate" (the signature element) ---------- */
.plate{
  background:var(--paper-lt);
  border:1.5px solid var(--ink);
  position:relative;
  margin:0 0 46px;
  padding:30px 34px 58px;
  box-shadow:3px 4px 0 rgba(35,40,46,.12);
}
.plate::before,.plate::after{
  content:"";position:absolute;width:14px;height:14px;
  border:1.5px solid var(--ink);
}
.plate::before{top:-8px;left:-8px;border-right:none;border-bottom:none}
.plate::after{bottom:-8px;right:-8px;border-left:none;border-top:none}
.plate-no{
  position:absolute;top:-1.5px;right:-1.5px;
  font-family:var(--mono);font-size:.65rem;letter-spacing:.1em;
  background:var(--ink);color:var(--paper-lt);padding:3px 10px;
}
.titleblock{
  position:absolute;left:-1.5px;bottom:-1.5px;right:-1.5px;
  display:flex;border-top:1.5px solid var(--ink);
  font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;color:var(--ink-soft);
  background:var(--paper-lt);
}
.titleblock span{padding:5px 12px;border-right:1px solid var(--rule)}
.titleblock span:last-child{border-right:none;margin-left:auto}

h1.plate-title,h2.plate-title{
  font-family:var(--mono);font-weight:700;letter-spacing:.01em;
  font-size:1.65rem;margin-bottom:4px;
}
.plate-sub{font-family:var(--mono);font-size:.82rem;color:var(--ink-soft);margin-bottom:22px}
.plate-sub::before{content:"— ";color:var(--copper)}

/* ---------- shared bits ---------- */
.eyebrow{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper);margin-bottom:6px;
}
.annotation{
  border:1px solid var(--copper);background:rgba(176,106,56,.06);
  padding:12px 16px;font-family:var(--mono);font-size:.8rem;line-height:1.6;
  max-width:44ch;
}
.callout-label{
  display:inline-block;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;
  text-transform:uppercase;border:1px solid var(--ink);padding:2px 8px;background:var(--paper-lt);
}
.dim{ /* dimension line */
  display:flex;align-items:center;gap:8px;font-family:var(--mono);
  font-size:.62rem;color:var(--ink-soft);letter-spacing:.1em;margin:18px 0 0;
}
.dim::before,.dim::after{content:"";flex:1;height:1px;background:var(--rule);
  box-shadow:0 -3px 0 -0.5px transparent}
.dim::before{border-left:1px solid var(--rule)}
.dim::after{border-right:1px solid var(--rule)}

/* ---------- tables (mono, drawing-style) ---------- */
table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:.78rem}
caption{
  text-align:left;font-family:var(--mono);font-size:.9rem;font-weight:700;
  padding:0 0 8px;letter-spacing:.02em;
}
caption::before{content:"▸ ";color:var(--copper)}
th{
  background:rgba(62,90,116,.14);border:1px solid var(--ink);
  text-align:left;padding:7px 10px;font-weight:700;letter-spacing:.03em;
}
td{border:1px solid var(--rule);padding:6px 10px;vertical-align:top;background:var(--paper-lt)}
tr:nth-child(even) td{background:rgba(157,180,140,.08)}
.table-wrap{overflow-x:auto;margin-bottom:34px}
.tag{
  font-size:.62rem;border:1px solid var(--sage-dk);color:var(--sage-dk);
  padding:0 5px;letter-spacing:.05em;white-space:nowrap;
}
.tag.c{border-color:var(--copper);color:var(--copper)}
.tag.n{border-color:var(--navy);color:var(--navy)}

/* ---------- layer stack (home + blueprint) ---------- */
.stack{display:flex;flex-direction:column-reverse;gap:10px;max-width:640px;margin:8px 0 4px}
.layer{
  border:1.5px solid var(--ink);padding:12px 16px;background:var(--paper-lt);
  position:relative;font-family:var(--mono);
  transform:skewX(-6deg);
  transition:transform .18s ease,box-shadow .18s ease;
}
.layer:hover{transform:skewX(-6deg) translateX(8px);box-shadow:-4px 4px 0 rgba(35,40,46,.14)}
.layer>div{transform:skewX(6deg)}
.layer b{font-size:.85rem;display:block}
.layer small{font-size:.7rem;color:var(--ink-soft)}
.layer::before{
  content:attr(data-n);position:absolute;left:-38px;top:50%;transform:translateY(-50%) skewX(6deg);
  font-size:.65rem;color:var(--copper);letter-spacing:.1em;
}
.l1{border-left:6px solid var(--ink)}
.l2{border-left:6px solid var(--navy)}
.l3{border-left:6px solid var(--sage-dk)}
.l4{border-left:6px solid var(--copper)}
.l5{border-left:6px solid var(--ink-soft)}

/* ---------- timeline ---------- */
.timeline{position:relative;margin:30px 0 10px;padding:0 6px}
.tl-axis{height:2px;background:var(--ink);position:relative;margin:120px 0}
.tl-ev{position:absolute;width:200px;font-family:var(--mono);font-size:.68rem;line-height:1.45}
.tl-ev .box{border:1.5px solid;background:var(--paper-lt);padding:7px 9px}
.tl-ev.up{bottom:14px}
.tl-ev.down{top:14px}
.tl-ev::before{content:"";position:absolute;left:16px;width:1.5px;height:14px}
.tl-ev.up::before{bottom:-14px;background:var(--navy)}
.tl-ev.down::before{top:-14px;background:var(--copper)}
.tl-ev.up .box{border-color:var(--navy)}
.tl-ev.down .box{border-color:var(--copper)}
.tl-ev .yr{position:absolute;left:8px;font-weight:700;color:var(--ink)}
.tl-ev.up .yr{bottom:-34px}
.tl-ev.down .yr{top:-34px}
.tl-tick{position:absolute;top:-5px;width:1.5px;height:12px;background:var(--ink)}
.tl-band{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;padding:4px 14px;color:#fff;display:inline-block}
.tl-band.theory{background:var(--navy)}
.tl-band.applied{background:var(--copper)}

/* ---------- card grids ---------- */
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:22px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.panel{
  border:1.5px solid var(--ink);background:var(--paper-lt);padding:16px 18px;position:relative;
}
.panel h3{
  font-family:var(--mono);font-size:.9rem;text-align:center;
  border:1px solid var(--ink);margin:-28px auto 12px;background:var(--paper-lt);
  width:fit-content;padding:3px 14px;
}
.panel p{font-size:.84rem;color:var(--ink-soft)}
.panel .eq{
  font-family:var(--mono);font-size:.8rem;text-align:center;margin-top:12px;
  border-top:1px dashed var(--rule);padding-top:10px;
}
svg text{font-family:var(--mono)}

/* ---------- pipeline ---------- */
.pipeline{display:flex;flex-wrap:wrap;gap:0;counter-reset:step;margin-top:8px}
.step{
  flex:1 1 140px;border:1.5px solid var(--ink);background:var(--paper-lt);
  padding:14px 12px 12px;position:relative;margin:0 18px 26px 0;
}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;top:-11px;left:10px;background:var(--ink);color:var(--paper-lt);
  font-family:var(--mono);font-size:.62rem;padding:2px 7px;letter-spacing:.1em;
}
.step::after{
  content:"→";position:absolute;right:-16px;top:42%;color:var(--copper);font-weight:700;
}
.step:last-child::after{content:""}
.step b{font-family:var(--mono);font-size:.78rem;display:block;margin-bottom:4px}
.step small{font-size:.7rem;color:var(--ink-soft)}

/* ---------- bio / home ---------- */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.hero h1{font-size:2.4rem;line-height:1.12;font-weight:600;margin:6px 0 14px}
.hero h1 .mono{font-family:var(--mono)}
.hero p.lede{font-size:1.02rem;max-width:52ch;color:var(--ink-soft);margin-bottom:20px}
.hero-photo{
  border:1.5px solid var(--ink);background:var(--paper-lt);
  padding:6px;box-shadow:3px 4px 0 rgba(35,40,46,.12);
}
.hero-photo img{display:block;width:100%;height:auto}
.spec-list{font-family:var(--mono);font-size:.78rem;border-top:1.5px solid var(--ink)}
.spec-list div{display:flex;justify-content:space-between;gap:16px;padding:8px 2px;border-bottom:1px dashed var(--rule)}
.spec-list dt{color:var(--ink-soft);letter-spacing:.06em;text-transform:uppercase;font-size:.66rem;padding-top:2px}
.spec-list dd{text-align:right}
.spec-list a{color:var(--navy);text-decoration:none;border-bottom:1px dashed var(--navy)}
.spec-list a:hover{color:var(--copper);border-bottom-color:var(--copper)}
.btn{
  display:inline-block;font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;
  border:1.5px solid var(--ink);padding:10px 20px;color:var(--ink);text-decoration:none;
  background:var(--sage);box-shadow:3px 3px 0 var(--ink);margin:18px 12px 0 0;
}
.btn:hover{transform:translate(1px,1px);box-shadow:2px 2px 0 var(--ink)}
.btn.alt{background:var(--paper-lt)}

/* ---------- stubs ---------- */
.stub{
  border:1.5px dashed var(--rule);min-height:340px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:10px;text-align:center;
  font-family:var(--mono);color:var(--ink-soft);
  background:repeating-linear-gradient(45deg,transparent 0 14px,rgba(80,100,120,.05) 14px 15px);
}
.stub .big{font-size:2.2rem;color:var(--rule)}
.stub small{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase}

/* ---------- tools / fourier series (epicycle machine) ----------
   Reuses the shared .uc-app dark "readout" theme (--uc-* tokens, same as
   Unit Circle below) so both Tools pages read as one instrument family.
   fs- classes are this tool's own layout/components; everything is scoped
   under #fourier-tool so it can't leak into Unit Circle's own uc-app. ---------- */
#fourier-tool .fs-header{display:flex;align-items:baseline;gap:18px;margin-bottom:18px;flex-wrap:wrap}
#fourier-tool .fs-header h1{font-family:'JetBrains Mono',var(--mono);font-size:1.05rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--uc-text)}
#fourier-tool .fs-formula{font-family:'JetBrains Mono',var(--mono);font-size:.76rem;color:var(--uc-text-dim);letter-spacing:.02em}
#fourier-tool .fs-formula b{color:var(--uc-hyp);font-weight:700}

#fourier-tool .fs-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;height:1020px}
#fourier-tool .fs-left{display:flex;flex-direction:column;gap:16px;min-width:0;min-height:0}
@media (max-width:900px){
  #fourier-tool .fs-layout{grid-template-columns:1fr;height:auto}
  #fourier-tool .fs-stage-wrap{height:52vh;min-height:380px}
}

#fourier-tool .fs-spectrum-wrap{
  border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;
  padding:14px 16px;display:flex;flex-direction:column;
}
#fourier-tool .fs-spectrum-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}
#fourier-tool .fs-eyebrow{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#fourier-tool .fs-spectrum-legend{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-text-dim)}
#fourier-tool .fs-spectrum-legend b{color:var(--uc-text);font-weight:700}
#fsSpectrum{display:block;width:100%;height:130px;cursor:crosshair;border-radius:8px}

#fourier-tool .fs-insight{font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-cos);padding:8px 2px 2px;min-height:26px;line-height:1.5}
#fourier-tool .fs-insight span.fs-dim{color:var(--uc-text-dim)}

#fourier-tool .fs-refnotes{border-top:1px dashed var(--uc-border);margin-top:6px;padding-top:8px;font-family:'JetBrains Mono',var(--mono)}
#fourier-tool .fs-refnotes summary{cursor:pointer;font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);list-style:none;user-select:none}
#fourier-tool .fs-refnotes summary::before{content:'▸ ';color:var(--uc-hyp)}
#fourier-tool .fs-refnotes[open] summary::before{content:'▾ '}
#fourier-tool .fs-refnotes summary:hover{color:var(--uc-text)}
#fourier-tool .fs-refgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin-top:10px}
#fourier-tool .fs-refcard{border:1px solid var(--uc-border);border-radius:8px;background:var(--uc-bg);padding:10px 12px;font-size:.72rem;line-height:1.6;color:var(--uc-text-dim)}
#fourier-tool .fs-refcard h3{font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-hyp);margin-bottom:4px;font-weight:700}
#fourier-tool .fs-refcard b{color:var(--uc-text);font-weight:700}
#fourier-tool .fs-refcard code{color:var(--uc-hyp);font-family:'JetBrains Mono',var(--mono);font-size:.68rem}

#fourier-tool .fs-stage-wrap{
  position:relative;overflow:hidden;flex:1;min-height:260px;
  border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;
}
#fsStage{display:block;width:100%;height:100%}
#fourier-tool .fs-stage-hud{
  position:absolute;left:14px;bottom:12px;font-family:'JetBrains Mono',var(--mono);font-size:.7rem;color:var(--uc-text-dim);
  background:var(--uc-bg);border:1px solid var(--uc-border);border-radius:8px;padding:6px 10px;pointer-events:none;
}
#fourier-tool .fs-stage-hud b{color:var(--uc-cos);font-weight:700}

#fourier-tool .fs-properties{
  border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px;
}
#fourier-tool .fs-power-compare{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:10px}
#fourier-tool .fs-power-stat{flex:0 0 auto}
#fourier-tool .fs-power-label{font-family:'JetBrains Mono',var(--mono);font-size:.66rem;color:var(--uc-text-dim);margin-bottom:4px}
#fourier-tool .fs-power-value{font-family:'JetBrains Mono',var(--mono);font-size:1.3rem;font-weight:700;color:var(--uc-text)}
#fourier-tool .fs-power-eq{font-size:1.3rem;color:var(--uc-text-dim);font-weight:700}
#fourier-tool .fs-power-match{
  margin-left:auto;font-family:'JetBrains Mono',var(--mono);font-size:.7rem;color:var(--uc-cos);
  border:1px solid var(--uc-cos);border-radius:999px;padding:3px 11px;
}
#fourier-tool .fs-stat-row{display:flex;gap:22px;flex-wrap:wrap;margin-top:14px;padding-top:12px;border-top:1px dashed var(--uc-border)}
#fourier-tool .fs-stat{display:flex;flex-direction:column;gap:2px}
#fourier-tool .fs-stat-label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#fourier-tool .fs-stat-value{font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;color:var(--uc-hyp)}
#fourier-tool .fs-power-bar{
  display:flex;height:20px;border-radius:6px;overflow:hidden;margin-top:8px;
  background:var(--uc-bg);border:1px solid var(--uc-border);
}
#fourier-tool .fs-power-seg{height:100%}
#fourier-tool .fs-power-bar-legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
#fourier-tool .fs-power-bar-legend-item{display:flex;align-items:center;gap:6px;font-family:'JetBrains Mono',var(--mono);font-size:.64rem;color:var(--uc-text-dim)}
#fourier-tool .fs-power-bar-legend-swatch{width:10px;height:10px;border-radius:2px}

#fourier-tool .fs-aside{
  border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;
  padding:16px;display:flex;flex-direction:column;overflow:hidden;
}

#fourier-tool .fs-panel-head{margin-bottom:12px}
#fourier-tool .fs-panel-head .fs-eyebrow{margin-bottom:8px;display:block}

#fourier-tool .fs-presets{display:flex;gap:6px;flex-wrap:wrap}
#fourier-tool .fs-presets button{
  font-family:'JetBrains Mono',var(--mono);font-size:.65rem;padding:5px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.5px;
}
#fourier-tool .fs-presets button:hover{border-color:var(--uc-angle);color:var(--uc-angle)}

#fourier-tool .fs-speed-row{margin:14px 0}
#fourier-tool .fs-speed-row label{
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);
}
#fourier-tool .fs-speed-row output{color:var(--uc-cos);font-weight:700;text-transform:none;letter-spacing:0}
#fourier-tool .fs-speed-row input[type=range]{width:100%}

#fourier-tool .fs-transport{display:flex;align-items:center;gap:10px;margin:14px 0}
#fourier-tool .fs-transport button{
  background:var(--uc-bg);border:1px solid var(--uc-border);color:var(--uc-text);border-radius:6px;
  padding:7px 14px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;
}
#fourier-tool .fs-transport button:hover{border-color:var(--uc-angle);color:var(--uc-angle)}

#fourier-tool .fs-gen-list{flex:1;overflow-y:auto;min-height:120px}
#fourier-tool .fs-gen-list::-webkit-scrollbar{width:8px}
#fourier-tool .fs-gen-list::-webkit-scrollbar-thumb{background:var(--uc-border);border-radius:4px}

#fourier-tool .fs-gen{border:1px solid var(--uc-border);border-radius:10px;background:var(--uc-bg);padding:10px 12px 12px;margin-bottom:10px;transition:border-color .12s}
#fourier-tool .fs-gen.hot{border-color:var(--uc-angle)}
#fourier-tool .fs-gen-top{display:flex;align-items:center;gap:8px;margin-bottom:8px}
#fourier-tool .fs-gen-swatch{width:10px;height:10px;border-radius:50%;flex-shrink:0}
#fourier-tool .fs-gen-title{font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-text);flex:1}
#fourier-tool .fs-gen-remove{background:none;border:none;color:var(--uc-text-dim);font-size:15px;line-height:1;cursor:pointer;padding:2px 6px;border-radius:4px}
#fourier-tool .fs-gen-remove:hover{color:var(--uc-sin)}

#fourier-tool .fs-ctl{display:grid;grid-template-columns:62px 1fr 58px;align-items:center;gap:8px;margin-top:6px}
#fourier-tool .fs-ctl label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#fourier-tool .fs-ctl output{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-cos);text-align:right}

#fourier-tool input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#fourier-tool input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--uc-angle);cursor:pointer;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#fourier-tool input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;border:none;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#fourier-tool button:focus-visible,#fourier-tool input:focus-visible{outline:2px solid var(--uc-angle);outline-offset:2px}

#fourier-tool .fs-add-row{margin-top:10px}
#fourier-tool .fs-add-row button{
  width:100%;padding:9px;background:transparent;border:1px dashed var(--uc-text-dim);color:var(--uc-text-dim);
  border-radius:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
}
#fourier-tool .fs-add-row button:hover{color:var(--uc-angle);border-color:var(--uc-angle)}

/* ---------- tools / taylor series expansion ----------
   Unlisted instrument (not in the Tools ▾ menu — reachable only by direct
   URL / router binding). Reuses the shared .uc-app dark "readout" theme so
   it still reads as part of the same instrument family; ts- classes are
   this tool's own layout/components, scoped under #taylor-tool. ---------- */
#taylor-tool .ts-header{display:flex;align-items:baseline;gap:18px;margin-bottom:18px;flex-wrap:wrap}
#taylor-tool .ts-header h1{font-family:'JetBrains Mono',var(--mono);font-size:1.05rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--uc-text)}
#taylor-tool .ts-formula{font-family:'JetBrains Mono',var(--mono);font-size:.76rem;color:var(--uc-text-dim);letter-spacing:.02em}
#taylor-tool .ts-formula b{color:var(--uc-hyp);font-weight:700}

#taylor-tool .ts-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px}
#taylor-tool .ts-left{display:flex;flex-direction:column;gap:16px;min-width:0}
@media (max-width:900px){#taylor-tool .ts-layout{grid-template-columns:1fr}}

#taylor-tool .ts-graph-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#taylor-tool .ts-graph-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}
#taylor-tool .ts-legend{display:flex;align-items:center;gap:12px;font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-text-dim)}
#taylor-tool .ts-swatch{display:inline-block;width:12px;height:3px;border-radius:2px;margin-right:4px;vertical-align:middle}
#taylor-tool .ts-swatch-f{background:var(--uc-cos)}
#taylor-tool .ts-swatch-p{background:#FFB454}
#taylor-tool .ts-swatch-a{background:var(--uc-angle)}
#tsGraph{display:block;width:100%;height:360px;border-radius:8px}

#taylor-tool .ts-terms-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#taylor-tool .ts-terms{font-family:'JetBrains Mono',var(--mono);font-size:.8rem;color:var(--uc-text);line-height:1.8;margin-top:8px;word-break:break-word}
#taylor-tool .ts-terms .ts-term-p{color:#FFB454}
#taylor-tool .ts-terms .ts-term-err{color:var(--uc-text-dim);font-size:.7rem;display:block;margin-top:6px}

#taylor-tool .ts-stats{display:flex;gap:22px;flex-wrap:wrap;border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:12px 16px}
#taylor-tool .ts-stat{display:flex;flex-direction:column;gap:2px}
#taylor-tool .ts-stat-label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#taylor-tool .ts-stat-value{font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;color:var(--uc-hyp)}

#taylor-tool .ts-aside{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:16px;display:flex;flex-direction:column}
#taylor-tool .ts-fn-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
#taylor-tool .ts-fn-row button{
  font-family:'JetBrains Mono',var(--mono);font-size:.72rem;padding:6px 11px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.3px;
}
#taylor-tool .ts-fn-row button:hover{border-color:var(--uc-angle);color:var(--uc-angle)}
#taylor-tool .ts-fn-row button.active{background:var(--uc-angle);color:var(--uc-bg);border-color:var(--uc-angle)}

#taylor-tool .ts-ctl-row{margin:16px 0}
#taylor-tool .ts-ctl-row label{
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);
}
#taylor-tool .ts-ctl-row output{color:var(--uc-cos);font-weight:700;text-transform:none;letter-spacing:0}
#taylor-tool .ts-ctl-row input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#taylor-tool .ts-ctl-row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--uc-angle);cursor:pointer;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#taylor-tool .ts-ctl-row input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;border:none;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#taylor-tool .ts-play-row{margin-top:auto;padding-top:14px}
#taylor-tool .ts-play-row button{
  width:100%;padding:9px;background:transparent;border:1px dashed var(--uc-text-dim);color:var(--uc-text-dim);
  border-radius:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
}
#taylor-tool .ts-play-row button:hover{color:var(--uc-angle);border-color:var(--uc-angle)}
#taylor-tool .ts-play-row button.active{color:var(--uc-bg);background:var(--uc-angle);border-color:var(--uc-angle)}
#taylor-tool button:focus-visible,#taylor-tool input:focus-visible{outline:2px solid var(--uc-angle);outline-offset:2px}

/* ---------- tools / unit circle instrument ----------
   Self-contained dark "readout" theme, deliberately kept apart from the
   paper/copper/sage blueprint palette above: the sin/cos/angle/hyp colors
   here are semantic (they're the legend colors used inside the canvases)
   and are retained as-is rather than reskinned. Everything is scoped
   under .uc-app / uc- prefixed classes so it can't collide with the
   site-wide .btn, .panel, .container, etc. ---------- */
.uc-app{
  --uc-bg:#0c0e14; --uc-panel:#12151e; --uc-border:#1e2233;
  --uc-text:#c8cdd8; --uc-text-dim:#b6bcd1;
  --uc-sin:#ff6b6b; --uc-cos:#4ecdc4; --uc-hyp:#ffe66d;
  --uc-angle:#a78bfa; --uc-theta:#f472b6; --uc-grid:#1a1d2b;
  background:var(--uc-bg);
  border:1.5px solid var(--ink);
  box-shadow:3px 4px 0 rgba(35,40,46,.12);
  padding:22px;
  color:var(--uc-text);
  font-family:'DM Sans',var(--sans);
}
.uc-app *{box-sizing:border-box}
.uc-container{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.uc-panel{
  background:var(--uc-panel);border:1px solid var(--uc-border);border-radius:14px;
  padding:18px;position:relative;
}
.uc-panel-label{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--uc-text-dim);margin-bottom:10px;
}
.uc-left{flex:0 0 480px}
.uc-right{flex:1 1 460px;min-width:340px}
.uc-app canvas{display:block;border-radius:8px;max-width:100%}
.uc-controls{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:14px}
.uc-control-group{display:flex;flex-direction:column;gap:4px}
.uc-control-group label{
  font-family:'JetBrains Mono',var(--mono);font-size:.65rem;letter-spacing:1px;
  text-transform:uppercase;color:var(--uc-text-dim);
}
.uc-control-group input[type="range"]{
  -webkit-appearance:none;appearance:none;width:200px;height:6px;border-radius:3px;
  background:var(--uc-border);outline:none;
}
.uc-control-group input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:var(--uc-angle);cursor:pointer;box-shadow:0 0 10px rgba(167,139,250,.5);
}
.uc-control-group input[type="range"]::-moz-range-thumb{
  width:18px;height:18px;border-radius:50%;background:var(--uc-angle);
  cursor:pointer;border:none;box-shadow:0 0 10px rgba(167,139,250,.5);
}
.uc-info-boxes{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.uc-info-box{
  font-family:'JetBrains Mono',var(--mono);font-size:.78rem;padding:6px 12px;border-radius:8px;
  background:var(--uc-bg);border:1px solid var(--uc-border);min-width:96px;text-align:center;
}
.uc-info-box .uc-label{font-size:.6rem;color:var(--uc-text-dim);letter-spacing:1px;text-transform:uppercase;margin-bottom:2px}
.uc-info-box .uc-value{font-weight:700;font-size:.95rem}
.uc-sin-val{color:var(--uc-sin)}
.uc-cos-val{color:var(--uc-cos)}
.uc-deg-val{color:var(--uc-angle)}
.uc-rad-val{color:var(--uc-theta)}
.uc-euler-val{color:var(--uc-hyp)}
.uc-info-box-wide{min-width:168px}
.uc-euler-note{
  font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-hyp);
  margin-top:8px;padding:6px 12px;border:1px dashed var(--uc-hyp);border-radius:8px;
  text-align:center;letter-spacing:.02em;
}
.uc-euler-note[hidden]{display:none}
.uc-btn-row{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.uc-btn{
  font-family:'JetBrains Mono',var(--mono);font-size:.65rem;padding:5px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.5px;
}
.uc-btn:hover{border-color:var(--uc-angle);color:var(--uc-angle)}
.uc-btn.active{background:var(--uc-angle);color:var(--uc-bg);border-color:var(--uc-angle)}
.uc-legend{display:flex;gap:16px;margin-top:10px;flex-wrap:wrap}
.uc-legend-item{display:flex;align-items:center;gap:6px;font-size:.75rem;font-family:'JetBrains Mono',var(--mono)}
.uc-legend-swatch{width:14px;height:3px;border-radius:2px}
@media(max-width:820px){.uc-left{flex:1 1 100%}.uc-right{min-width:0}}

/* ---------- math reference page ---------- */
.mx-doc .intro{
  font-family:var(--sans);font-size:.92rem;color:var(--ink);
  border:1px solid var(--copper);background:rgba(176,106,56,.06);
  width:100%;max-width:none;box-sizing:border-box;padding:14px 18px;margin:0 0 28px;
}
.mx-doc h3{
  font-family:var(--mono);font-size:.95rem;font-weight:700;color:var(--navy);
  letter-spacing:.02em;margin:30px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--rule);
}
.mx-doc section:first-of-type h3{margin-top:0}
.mx-doc p{font-size:.86rem;color:var(--ink-soft);margin-bottom:12px;line-height:1.65;max-width:74ch}
.mx-doc ul{padding-left:1.2rem;margin:8px 0 18px}
.mx-doc li{font-size:.85rem;color:var(--ink-soft);line-height:1.65;margin-bottom:10px;max-width:72ch}
.mx-doc strong{color:var(--ink)}
.mx-doc em{color:var(--ink-soft);font-size:.92em}
.mx-doc code{
  background:rgba(62,90,116,.10);border:1px solid var(--rule);border-radius:3px;
  padding:.12rem .4rem;font-family:var(--mono);font-size:.85em;color:var(--navy);
}
.mx-doc mjx-container{color:var(--ink)}

/* ---------- bio engineering reference ---------- */
.bio-doc a{color:var(--navy);text-decoration:none;border-bottom:1px dashed var(--navy)}
.bio-doc a:hover{color:var(--copper);border-bottom-color:var(--copper)}
.bio-doc td.muted{color:var(--rule);font-style:italic}

footer{
  flex:0 0 auto;
  border-top:2px solid var(--ink);
  background:var(--paper);
  font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;color:var(--ink-soft);
}
footer .inner{max-width:1160px;margin:0 auto;padding:16px 24px;text-align:center}

@media(max-width:820px){
  .hero{grid-template-columns:1fr}
  .plate{padding:24px 18px 58px}
  .layer::before{display:none}
  .tl-ev{width:150px}
}

/* ---------- tools / convolution machine ----------
   The Overview and Applications tabs stay in the light paper/copper
   blueprint theme, reusing .mx-doc for copy and .grid3/.panel for card
   grids. The Machine and Kernel Lab tabs reuse the shared .uc-app dark
   "readout" theme (same instrument family as Fourier/Taylor/Unit Circle).
   cv- classes are this tool's own layout/components, scoped under
   #convolution-tool. ---------- */
#convolution-tool .cv-tabs{
  display:flex;gap:2px;flex-wrap:wrap;margin-bottom:26px;border-bottom:1.5px solid var(--ink);
}
#convolution-tool .cv-tabs button{
  appearance:none;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1.5px;
  padding:9px 16px;font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);cursor:pointer;
}
#convolution-tool .cv-tabs button:hover{color:var(--ink);background:rgba(157,180,140,.18)}
#convolution-tool .cv-tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--copper)}
#convolution-tool .cv-tabs .cv-tabnum{color:var(--copper);margin-right:6px}
#convolution-tool .cv-tabs button:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

#convolution-tool .cv-panel-section{display:none}
#convolution-tool .cv-panel-section.active{display:block;animation:reveal .3s ease}
@media (prefers-reduced-motion:reduce){#convolution-tool .cv-panel-section.active{animation:none}}

#convolution-tool .cv-formula{
  font-family:var(--mono);font-size:.92rem;color:var(--navy);background:rgba(62,90,116,.08);
  border:1px solid var(--rule);display:inline-block;padding:10px 18px;margin:4px 0 20px;
}
#convolution-tool .cv-note{font-size:.86rem;color:var(--ink-soft)}

#convolution-tool .cv-stepnav{
  display:flex;justify-content:space-between;margin-top:34px;padding-top:16px;border-top:1px dashed var(--rule);
}
#convolution-tool .cv-navbtn{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;
  border:1px solid var(--ink);padding:8px 16px;background:var(--paper-lt);color:var(--ink);cursor:pointer;
}
#convolution-tool .cv-navbtn:hover{border-color:var(--copper);color:var(--copper)}
#convolution-tool .cv-navbtn.primary{background:var(--sage);box-shadow:2px 2px 0 var(--ink)}
#convolution-tool .cv-navbtn.primary:hover{color:var(--ink);border-color:var(--ink)}
#convolution-tool .cv-navbtn:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

#convolution-tool .cv-app-head{margin-bottom:14px}
#convolution-tool .cv-app-head h3{
  font-family:'JetBrains Mono',var(--mono);font-size:.95rem;font-weight:700;letter-spacing:.03em;
  text-transform:uppercase;color:var(--uc-text);margin-bottom:4px;
}
#convolution-tool .cv-app-head p{font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-text-dim);max-width:60ch;margin:0}

#convolution-tool .cv-pos-group input[type="range"]{width:260px}

#convolution-tool .cv-scope{margin:14px 0}
#convolution-tool .cv-scope canvas{width:100%;display:block}

#convolution-tool .cv-appnote{font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-text-dim);margin-top:12px;line-height:1.6}

#convolution-tool .cv-select-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:14px 0}
#convolution-tool .cv-select-row label{
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:.05em;text-transform:uppercase;color:var(--uc-text-dim);
}
#convolution-tool .uc-app select{
  font-family:'JetBrains Mono',var(--mono);font-size:.72rem;padding:6px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);cursor:pointer;
}

#convolution-tool .cv-weight-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;max-width:420px;margin:16px 0 4px}
#convolution-tool .cv-weight-cell{text-align:center}
#convolution-tool .cv-weight-cell input[type="range"]{
  writing-mode:vertical-lr;direction:rtl;width:22px;height:110px;min-width:0;
  -webkit-appearance:none;appearance:none;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#convolution-tool .cv-weight-cell input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#convolution-tool .cv-weight-cell input[type="range"]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;border:none;
}
#convolution-tool .cv-weight-cell .cv-wval{font-family:'JetBrains Mono',var(--mono);font-size:.72rem;display:block;margin-top:6px;color:var(--uc-text)}
#convolution-tool .cv-weight-cell .cv-widx{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;color:var(--uc-text-dim)}
#convolution-tool input[type="range"]:focus-visible{outline:2px solid var(--uc-angle);outline-offset:2px}

#convolution-tool .cv-quiz fieldset{
  border:1.5px solid var(--ink);background:var(--paper-lt);padding:16px 18px;margin:0 0 16px;
}
#convolution-tool .cv-quiz legend{font-family:var(--mono);font-size:.85rem;font-weight:700;padding:0 8px}
#convolution-tool .cv-quiz label.cv-opt{display:block;padding:6px 4px;font-size:.86rem;cursor:pointer;border-radius:4px}
#convolution-tool .cv-quiz label.cv-opt:hover{background:rgba(157,180,140,.16)}
#convolution-tool .cv-quiz input[type="radio"]{accent-color:var(--copper);margin-right:8px}
#convolution-tool .cv-quiz input[type="radio"]:focus-visible{outline:2px solid var(--copper);outline-offset:2px}
#convolution-tool .cv-quiz .cv-verdict{font-family:var(--mono);font-size:.76rem;margin-top:8px;display:none}
#convolution-tool .cv-quiz .cv-verdict.ok{display:block;color:var(--sage-dk)}
#convolution-tool .cv-quiz .cv-verdict.no{display:block;color:var(--copper)}
#convolution-tool .cv-quiz .cv-err{display:none;font-size:.8rem;color:var(--copper);margin:6px 0 0}
#convolution-tool .cv-quiz .cv-err.show{display:block}
#convolution-tool .cv-quiz-score{font-family:var(--mono);font-size:.78rem;color:var(--ink-soft)}

@media(max-width:560px){
  #convolution-tool .cv-weight-grid{max-width:100%}
  #convolution-tool .cv-weight-cell input[type="range"]{height:90px}
  #convolution-tool .cv-pos-group input[type="range"]{width:180px}
}

/* ---------- tools / matrix transformation ----------
   Reuses the shared .uc-app dark "readout" theme (same instrument family
   as Fourier/Taylor/Unit Circle/Convolution). mt- classes are this tool's
   own layout/components, scoped under #matrix-tool. î/ĵ/v/eigenvector
   colors are semantic (they match the legend + canvas-drawn strokes), so
   they're pulled straight from the shared --uc-* tokens rather than the
   paper/copper/sage blueprint palette. ---------- */
#matrix-tool .mt-header{display:flex;align-items:baseline;gap:18px;margin-bottom:18px;flex-wrap:wrap}
#matrix-tool .mt-header h1{font-family:'JetBrains Mono',var(--mono);font-size:1.05rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--uc-text)}
#matrix-tool .mt-formula{font-family:'JetBrains Mono',var(--mono);font-size:.76rem;color:var(--uc-text-dim);letter-spacing:.02em}
#matrix-tool .mt-formula b{color:var(--uc-hyp);font-weight:700}

#matrix-tool .mt-eyebrow{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--uc-text-dim)}

#matrix-tool .mt-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px}
#matrix-tool .mt-left{display:flex;flex-direction:column;gap:16px;min-width:0}
@media (max-width:900px){#matrix-tool .mt-layout{grid-template-columns:1fr}}

#matrix-tool .mt-canvas-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#matrix-tool .mt-canvas-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}
#matrix-tool .mt-legend{display:flex;align-items:center;gap:12px;font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-text-dim);flex-wrap:wrap}
#matrix-tool .mt-swatch{display:inline-block;width:12px;height:3px;border-radius:2px;margin-right:4px;vertical-align:middle}
#matrix-tool .mt-swatch-i{background:var(--uc-sin)}
#matrix-tool .mt-swatch-j{background:var(--uc-cos)}
#matrix-tool .mt-swatch-v{background:var(--uc-angle)}
#matrix-tool .mt-swatch-eig{background:var(--uc-hyp)}
#mtCanvas{display:block;width:100%;height:420px;border-radius:8px;touch-action:none}

#matrix-tool .mt-readout-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#matrix-tool .mt-readout{font-family:'JetBrains Mono',var(--mono);font-size:.8rem;color:var(--uc-text);line-height:1.9;margin-top:8px}
#matrix-tool .mt-readout .mt-col-i{color:var(--uc-sin);font-weight:700}
#matrix-tool .mt-readout .mt-col-j{color:var(--uc-cos);font-weight:700}
#matrix-tool .mt-readout .mt-note{color:var(--uc-text-dim);font-size:.72rem;display:block;margin-top:6px}

#matrix-tool .mt-stats{display:flex;gap:20px;flex-wrap:wrap;border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:12px 16px}
#matrix-tool .mt-stat{display:flex;flex-direction:column;gap:2px}
#matrix-tool .mt-stat-label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#matrix-tool .mt-stat-value{font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;color:var(--uc-hyp)}
#matrix-tool .mt-stat-value.mt-flip{color:var(--uc-sin)}

#matrix-tool .mt-aside{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:16px;display:flex;flex-direction:column}
#matrix-tool .mt-preset-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
#matrix-tool .mt-preset-row button{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;padding:6px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.3px;
}
#matrix-tool .mt-preset-row button:hover{border-color:var(--uc-angle);color:var(--uc-angle)}
#matrix-tool .mt-preset-row button.active{background:var(--uc-angle);color:var(--uc-bg);border-color:var(--uc-angle)}

#matrix-tool .mt-matrix{display:flex;align-items:center;gap:6px;margin-top:10px}
#matrix-tool .mt-bracket{width:8px;height:64px;flex:0 0 auto}
#matrix-tool .mt-bracket-l{border-left:2px solid var(--uc-text-dim);border-top:2px solid var(--uc-text-dim);border-bottom:2px solid var(--uc-text-dim)}
#matrix-tool .mt-bracket-r{border-right:2px solid var(--uc-text-dim);border-top:2px solid var(--uc-text-dim);border-bottom:2px solid var(--uc-text-dim)}
#matrix-tool .mt-matrix-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;flex:1 1 auto}
#matrix-tool .mt-matrix-grid input{
  width:100%;font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;text-align:center;
  background:var(--uc-bg);border:1px solid var(--uc-border);border-radius:6px;color:var(--uc-text);
  padding:8px 2px;-moz-appearance:textfield;
}
#matrix-tool .mt-matrix-grid input::-webkit-outer-spin-button,
#matrix-tool .mt-matrix-grid input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
#matrix-tool .mt-matrix-grid input:focus{border-color:var(--uc-angle);outline:none}

#matrix-tool .mt-vector-row{display:flex;align-items:center;gap:6px;margin-top:8px}
#matrix-tool .mt-vector-label{
  font-family:'JetBrains Mono',var(--mono);font-size:.78rem;font-weight:700;color:var(--uc-angle);
  width:34px;flex:0 0 auto;
}
#matrix-tool .mt-vector-row input{
  width:0;flex:1 1 auto;font-family:'JetBrains Mono',var(--mono);font-size:.82rem;font-weight:700;text-align:center;
  background:var(--uc-bg);border:1px solid var(--uc-border);border-radius:6px;color:var(--uc-text);
  padding:7px 2px;-moz-appearance:textfield;
}
#matrix-tool .mt-vector-row input::-webkit-outer-spin-button,
#matrix-tool .mt-vector-row input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
#matrix-tool .mt-vector-row input:focus{border-color:var(--uc-angle);outline:none}
#matrix-tool .mt-vector-readout .mt-vector-value{
  width:0;flex:1 1 auto;font-family:'JetBrains Mono',var(--mono);font-size:.82rem;font-weight:700;text-align:center;
  background:transparent;border:1px solid transparent;color:var(--uc-hyp);padding:7px 2px;
}
#matrix-tool .mt-effect-note{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;line-height:1.6;color:var(--uc-text-dim);
  margin-top:8px;
}

#matrix-tool .mt-ctl-row{margin:16px 0 0}
#matrix-tool .mt-ctl-row label{
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);
}
#matrix-tool .mt-ctl-row output{color:var(--uc-cos);font-weight:700;text-transform:none;letter-spacing:0}
#matrix-tool .mt-ctl-row input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#matrix-tool .mt-ctl-row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--uc-angle);cursor:pointer;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#matrix-tool .mt-ctl-row input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;border:none;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#matrix-tool .mt-play-row{margin-top:12px}
#matrix-tool .mt-play-row button{
  width:100%;padding:9px;background:transparent;border:1px dashed var(--uc-text-dim);color:var(--uc-text-dim);
  border-radius:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
}
#matrix-tool .mt-play-row button:hover{color:var(--uc-angle);border-color:var(--uc-angle)}
#matrix-tool .mt-play-row button.active{color:var(--uc-bg);background:var(--uc-angle);border-color:var(--uc-angle)}

#matrix-tool .mt-toggle-row{display:flex;flex-direction:column;gap:8px;margin-top:8px}
#matrix-tool .mt-toggle-row label{
  display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',var(--mono);font-size:.74rem;color:var(--uc-text);cursor:pointer;
}
#matrix-tool .mt-toggle-row input[type=checkbox]{accent-color:var(--uc-angle);width:14px;height:14px;cursor:pointer}

#matrix-tool button:focus-visible,#matrix-tool input:focus-visible{outline:2px solid var(--uc-angle);outline-offset:2px}

@media(max-width:560px){
  #matrix-tool .mt-stats{gap:14px}
  #mtCanvas{height:320px}
}

/* ---------- tutorials / matrices (tab shell) ----------
   Same tab pattern as #convolution-tool's .cv-tabs, scoped under
   #matrix-tool with an mtx- prefix so it can't collide with this page's
   own mt- component classes (the Matrix Lab canvas tool itself). ---------- */
#matrix-tool .mtx-tabs{
  display:flex;gap:2px;flex-wrap:wrap;margin-bottom:26px;border-bottom:1.5px solid var(--ink);
}
#matrix-tool .mtx-tabs button{
  appearance:none;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1.5px;
  padding:9px 16px;font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);cursor:pointer;
}
#matrix-tool .mtx-tabs button:hover{color:var(--ink);background:rgba(157,180,140,.18)}
#matrix-tool .mtx-tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--copper)}
#matrix-tool .mtx-tabs .mtx-tabnum{color:var(--copper);margin-right:6px}
#matrix-tool .mtx-tabs button:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

#matrix-tool .mtx-panel-section{display:none}
#matrix-tool .mtx-panel-section.active{display:block;animation:reveal .3s ease}
@media (prefers-reduced-motion:reduce){#matrix-tool .mtx-panel-section.active{animation:none}}

/* ---------- tools / activation functions ----------
   Same instrument family and mt- component layout as #matrix-tool (dark
   .uc-app readout theme), duplicated under #activation-tool rather than
   sharing selectors so the two tools stay independently editable. Gate/
   content colors follow the design doc (gate = blue, content = gold);
   --act-gate is a new token since none of the shared --uc-* colors is
   blue, --uc-hyp (gold) is reused as-is for the content matrix. ---------- */
#activation-tool{--act-gate:#5b9bd5}

#activation-tool .mt-header{display:flex;align-items:baseline;gap:18px;margin-bottom:18px;flex-wrap:wrap}
#activation-tool .mt-header h1{font-family:'JetBrains Mono',var(--mono);font-size:1.05rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--uc-text)}
#activation-tool .mt-formula{font-family:'JetBrains Mono',var(--mono);font-size:.76rem;color:var(--uc-text-dim);letter-spacing:.02em}
#activation-tool .mt-formula b{color:var(--uc-hyp);font-weight:700}

#activation-tool .mt-eyebrow{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--uc-text-dim)}

#activation-tool .mt-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px}
#activation-tool .mt-left{display:flex;flex-direction:column;gap:16px;min-width:0}
@media (max-width:900px){#activation-tool .mt-layout{grid-template-columns:1fr}}

#activation-tool .mt-canvas-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#activation-tool .mt-canvas-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}
#activation-tool .mt-legend{display:flex;align-items:center;gap:12px;font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-text-dim);flex-wrap:wrap}
#activation-tool .mt-swatch{display:inline-block;width:12px;height:3px;border-radius:2px;margin-right:4px;vertical-align:middle}
#activation-tool .mt-swatch-grid{background:var(--uc-cos)}
#activation-tool .mt-swatch-v{background:var(--uc-angle)}
#activation-tool .mt-swatch-gate{background:var(--act-gate)}
#activation-tool .mt-swatch-content{background:var(--uc-hyp)}
#actCanvas{display:block;width:100%;height:420px;border-radius:8px;touch-action:none}

#activation-tool .mt-readout-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#activation-tool .mt-readout{font-family:'JetBrains Mono',var(--mono);font-size:.8rem;color:var(--uc-text);line-height:1.9;margin-top:8px}
#activation-tool .mt-readout .mt-note{color:var(--uc-text-dim);font-size:.72rem;display:block;margin-top:6px}

#activation-tool .mt-stats{display:flex;gap:20px;flex-wrap:wrap;border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:12px 16px}
#activation-tool .mt-stat{display:flex;flex-direction:column;gap:2px}
#activation-tool .mt-stat-label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#activation-tool .mt-stat-value{font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;color:var(--uc-hyp)}
#activation-tool .mt-stat-value.mt-dead{color:var(--uc-sin)}

#activation-tool .mt-aside{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:16px;display:flex;flex-direction:column}

#activation-tool .uc-app select{
  width:100%;font-family:'JetBrains Mono',var(--mono);font-size:.8rem;font-weight:700;padding:8px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);cursor:pointer;
}
#activation-tool .uc-app select:focus{border-color:var(--uc-angle);outline:none}

#activation-tool .mt-preset-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
#activation-tool .mt-preset-row button{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;padding:6px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.3px;
}
#activation-tool .mt-preset-row button:hover{border-color:var(--uc-angle);color:var(--uc-angle)}
#activation-tool .mt-preset-row button.active{background:var(--uc-angle);color:var(--uc-bg);border-color:var(--uc-angle)}

#activation-tool .mt-matrix{display:flex;align-items:center;gap:6px;margin-top:10px}
#activation-tool .mt-bracket{width:8px;height:64px;flex:0 0 auto}
#activation-tool .mt-bracket-l{border-left:2px solid var(--uc-text-dim);border-top:2px solid var(--uc-text-dim);border-bottom:2px solid var(--uc-text-dim)}
#activation-tool .mt-bracket-r{border-right:2px solid var(--uc-text-dim);border-top:2px solid var(--uc-text-dim);border-bottom:2px solid var(--uc-text-dim)}
#activation-tool .mt-matrix-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;flex:1 1 auto}
#activation-tool .mt-matrix-grid input{
  width:100%;font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;text-align:center;
  background:var(--uc-bg);border:1px solid var(--uc-border);border-radius:6px;color:var(--uc-text);
  padding:8px 2px;-moz-appearance:textfield;
}
#activation-tool .mt-matrix-grid input::-webkit-outer-spin-button,
#activation-tool .mt-matrix-grid input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
#activation-tool .mt-matrix-grid input:focus{border-color:var(--uc-angle);outline:none}
#activation-tool .mt-matrix.mt-matrix-gate .mt-bracket-l,
#activation-tool .mt-matrix.mt-matrix-gate .mt-bracket-r{border-color:var(--act-gate)}
#activation-tool .mt-matrix.mt-matrix-gate input{color:var(--act-gate)}
#activation-tool .mt-matrix.mt-matrix-content .mt-bracket-l,
#activation-tool .mt-matrix.mt-matrix-content .mt-bracket-r{border-color:var(--uc-hyp)}
#activation-tool .mt-matrix.mt-matrix-content input{color:var(--uc-hyp)}
#activation-tool .mt-matrix-block{display:none}
#activation-tool .mt-matrix-block.active{display:block}

#activation-tool .mt-vector-row{display:flex;align-items:center;gap:6px;margin-top:8px}
#activation-tool .mt-vector-label{
  font-family:'JetBrains Mono',var(--mono);font-size:.78rem;font-weight:700;color:var(--uc-angle);
  width:34px;flex:0 0 auto;
}
#activation-tool .mt-vector-row input{
  width:0;flex:1 1 auto;font-family:'JetBrains Mono',var(--mono);font-size:.82rem;font-weight:700;text-align:center;
  background:var(--uc-bg);border:1px solid var(--uc-border);border-radius:6px;color:var(--uc-text);
  padding:7px 2px;-moz-appearance:textfield;
}
#activation-tool .mt-vector-row input::-webkit-outer-spin-button,
#activation-tool .mt-vector-row input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
#activation-tool .mt-vector-row input:focus{border-color:var(--uc-angle);outline:none}
#activation-tool .mt-vector-readout .mt-vector-value{
  width:0;flex:1 1 auto;font-family:'JetBrains Mono',var(--mono);font-size:.82rem;font-weight:700;text-align:center;
  background:transparent;border:1px solid transparent;color:var(--uc-hyp);padding:7px 2px;
}
#activation-tool .mt-effect-note{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;line-height:1.6;color:var(--uc-text-dim);
  margin-top:8px;
}

#activation-tool .mt-ctl-row{margin:16px 0 0}
#activation-tool .mt-ctl-row label{
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);
}
#activation-tool .mt-ctl-row output{color:var(--uc-cos);font-weight:700;text-transform:none;letter-spacing:0}
#activation-tool .mt-ctl-row input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#activation-tool .mt-ctl-row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--uc-angle);cursor:pointer;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#activation-tool .mt-ctl-row input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--uc-angle);cursor:pointer;border:none;box-shadow:0 0 8px rgba(167,139,250,.5);
}
#activation-tool .mt-ctl-row input[type=range]:disabled{opacity:.35;cursor:not-allowed}
#activation-tool .mt-ctl-row.disabled label{opacity:.5}

#activation-tool .mt-play-row{margin-top:12px}
#activation-tool .mt-play-row button{
  width:100%;padding:9px;background:transparent;border:1px dashed var(--uc-text-dim);color:var(--uc-text-dim);
  border-radius:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
}
#activation-tool .mt-play-row button:hover{color:var(--uc-angle);border-color:var(--uc-angle)}
#activation-tool .mt-play-row button.active{color:var(--uc-bg);background:var(--uc-angle);border-color:var(--uc-angle)}

#activation-tool .mt-toggle-row{display:flex;flex-direction:column;gap:8px;margin-top:8px}
#activation-tool .mt-toggle-row label{
  display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',var(--mono);font-size:.74rem;color:var(--uc-text);cursor:pointer;
}
#activation-tool .mt-toggle-row input[type=checkbox]{accent-color:var(--uc-angle);width:14px;height:14px;cursor:pointer}

#activation-tool .act-tag{
  font-family:'JetBrains Mono',var(--mono);font-size:.6rem;letter-spacing:.05em;text-transform:uppercase;
  padding:1px 6px;border-radius:4px;margin-left:6px;border:1px solid currentColor;
}
#activation-tool .act-tag-gate{color:var(--act-gate)}
#activation-tool .act-tag-content{color:var(--uc-hyp)}

#activation-tool button:focus-visible,#activation-tool input:focus-visible,#activation-tool select:focus-visible{outline:2px solid var(--uc-angle);outline-offset:2px}

@media(max-width:560px){
  #activation-tool .mt-stats{gap:14px}
  #actCanvas{height:320px}
}

/* tab shell — same pattern as #matrix-tool's .mtx-tabs, act- prefixed */
#activation-tool .act-tabs{
  display:flex;gap:2px;flex-wrap:wrap;margin-bottom:26px;border-bottom:1.5px solid var(--ink);
}
#activation-tool .act-tabs button{
  appearance:none;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1.5px;
  padding:9px 16px;font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);cursor:pointer;
}
#activation-tool .act-tabs button:hover{color:var(--ink);background:rgba(157,180,140,.18)}
#activation-tool .act-tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--copper)}
#activation-tool .act-tabs .act-tabnum{color:var(--copper);margin-right:6px}
#activation-tool .act-tabs button:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

#activation-tool .act-panel-section{display:none}
#activation-tool .act-panel-section.active{display:block;animation:reveal .3s ease}
@media (prefers-reduced-motion:reduce){#activation-tool .act-panel-section.active{animation:none}}

/* ---------- tools / latent space ----------
   Same instrument family and mt- component layout as #activation-tool
   (dark .uc-app readout theme), duplicated under #latent-tool rather than
   sharing selectors so the two tools stay independently editable. The
   accent palette here is deliberately cool (teal / magenta / indigo /
   cyan) instead of the copper/amber tones used inside the Activation
   Functions canvas — only the sitewide tab-underline color (--copper)
   is kept, for consistency with every other tool's tab chrome. ---------- */
#latent-tool{--lat-animal:#2dd4bf;--lat-vehicle:#ec4899;--lat-fruit:#818cf8;--lat-accent:#22d3ee}

#latent-tool .mt-header{display:flex;align-items:baseline;gap:18px;margin-bottom:18px;flex-wrap:wrap}
#latent-tool .mt-header h1{font-family:'JetBrains Mono',var(--mono);font-size:1.05rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--uc-text)}
#latent-tool .mt-formula{font-family:'JetBrains Mono',var(--mono);font-size:.76rem;color:var(--uc-text-dim);letter-spacing:.02em}
#latent-tool .mt-formula sub,#latent-tool .mt-formula sup{color:var(--lat-accent)}

#latent-tool .mt-eyebrow{font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--uc-text-dim)}

#latent-tool .mt-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px}
#latent-tool .mt-left{display:flex;flex-direction:column;gap:16px;min-width:0}
@media (max-width:900px){#latent-tool .mt-layout{grid-template-columns:1fr}}

#latent-tool .mt-canvas-wrap,#latent-tool .lat-matrix-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#latent-tool .mt-canvas-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}
#latent-tool .mt-legend{display:flex;align-items:center;gap:12px;font-family:'JetBrains Mono',var(--mono);font-size:.68rem;color:var(--uc-text-dim);flex-wrap:wrap}
#latent-tool .lat-swatch{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:4px;vertical-align:middle}
#latent-tool .lat-swatch-animal{background:var(--lat-animal)}
#latent-tool .lat-swatch-vehicle{background:var(--lat-vehicle)}
#latent-tool .lat-swatch-fruit{background:var(--lat-fruit)}
#latent-tool .lat-swatch-sel{background:transparent;border:2px solid var(--lat-accent)}
#latent-tool .mt-swatch{display:inline-block;width:12px;height:3px;border-radius:2px;margin-right:4px;vertical-align:middle}
#latent-tool .lat-swatch-neg{background:#ef4444}
#latent-tool .lat-swatch-pos{background:#3b82f6}
#latCanvas{display:block;width:100%;height:340px;border-radius:8px;touch-action:none;cursor:pointer}

#latent-tool .lat-matrix-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:3px}
#latent-tool .lat-cell{aspect-ratio:1.3;border-radius:3px;cursor:pointer;border:1px solid transparent}
#latent-tool .lat-cell.lat-row-sel{border-color:var(--lat-accent)}
#latent-tool .lat-row-label{
  grid-column:1/-1;font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;
  color:var(--uc-text-dim);margin-top:6px;display:flex;justify-content:space-between;
}
#latent-tool .lat-row-label:first-child{margin-top:0}
#latent-tool .lat-row-label.lat-row-label-sel{color:var(--lat-accent)}
#latent-tool .lat-note{font-family:'JetBrains Mono',var(--mono);font-size:.7rem;line-height:1.6;color:var(--uc-text-dim);margin:0 0 10px}
#latent-tool .lat-cell.lat-row-neighbor{border-color:var(--lat-accent);border-style:dashed}
#latent-tool .lat-row-label.lat-row-label-neighbor{color:var(--lat-accent);opacity:.85}
#latent-tool .lat-neighbor-tag{font-size:.58rem;letter-spacing:.5px;text-transform:uppercase;opacity:.75;margin-left:4px}

#latent-tool .mt-readout-wrap{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:14px 16px}
#latent-tool .mt-readout{font-family:'JetBrains Mono',var(--mono);font-size:.8rem;color:var(--uc-text);line-height:1.9;margin-top:8px}

#latent-tool .mt-stats{display:flex;gap:20px;flex-wrap:wrap;border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:12px 16px}
#latent-tool .mt-stat{display:flex;flex-direction:column;gap:2px}
#latent-tool .mt-stat-label{font-family:'JetBrains Mono',var(--mono);font-size:.62rem;letter-spacing:.5px;text-transform:uppercase;color:var(--uc-text-dim)}
#latent-tool .mt-stat-value{font-family:'JetBrains Mono',var(--mono);font-size:.86rem;font-weight:700;color:var(--lat-accent)}

#latent-tool .mt-aside{border:1px solid var(--uc-border);background:var(--uc-panel);border-radius:14px;padding:16px;display:flex;flex-direction:column}

#latent-tool .uc-app select{
  width:100%;font-family:'JetBrains Mono',var(--mono);font-size:.8rem;font-weight:700;padding:8px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);cursor:pointer;
}
#latent-tool .uc-app select:focus{border-color:var(--lat-accent);outline:none}

#latent-tool .lat-picker{display:flex;flex-wrap:wrap;gap:6px}
#latent-tool .lat-picker button{
  font-family:'JetBrains Mono',var(--mono);font-size:.7rem;padding:6px 10px;border-radius:6px;
  border:1px solid var(--uc-border);background:var(--uc-bg);color:var(--uc-text);
  cursor:pointer;transition:all .15s;letter-spacing:.3px;display:flex;align-items:center;gap:5px;
}
#latent-tool .lat-picker button .lat-swatch{width:8px;height:8px;margin-right:0}
#latent-tool .lat-picker button:hover{border-color:var(--lat-accent);color:var(--lat-accent)}
#latent-tool .lat-picker button.active{background:var(--lat-accent);color:var(--uc-bg);border-color:var(--lat-accent)}
#latent-tool .lat-picker button.active .lat-swatch{border-color:var(--uc-bg)}

#latent-tool .mt-ctl-row{margin:16px 0 0}
#latent-tool .mt-ctl-row label{
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;
  font-family:'JetBrains Mono',var(--mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--uc-text-dim);
}
#latent-tool .mt-ctl-row output{color:var(--lat-accent);font-weight:700;text-transform:none;letter-spacing:0}
#latent-tool .mt-ctl-row input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--uc-border);border-radius:3px;cursor:pointer;outline:none;
}
#latent-tool .mt-ctl-row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--lat-accent);cursor:pointer;box-shadow:0 0 8px rgba(34,211,238,.5);
}
#latent-tool .mt-ctl-row input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--lat-accent);cursor:pointer;border:none;box-shadow:0 0 8px rgba(34,211,238,.5);
}

#latent-tool .mt-play-row{margin-top:12px}
#latent-tool .mt-play-row button{
  width:100%;padding:9px;background:transparent;border:1px dashed var(--uc-text-dim);color:var(--uc-text-dim);
  border-radius:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
}
#latent-tool .mt-play-row button:hover{color:var(--lat-accent);border-color:var(--lat-accent)}

#latent-tool .mt-toggle-row{display:flex;flex-direction:column;gap:8px;margin-top:8px}
#latent-tool .mt-toggle-row label{
  display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',var(--mono);font-size:.74rem;color:var(--uc-text);cursor:pointer;
}
#latent-tool .mt-toggle-row input[type=checkbox]{accent-color:var(--lat-accent);width:14px;height:14px;cursor:pointer}

#latent-tool .lat-neighbor-list{display:flex;flex-direction:column;gap:6px}
#latent-tool .lat-neighbor-item{
  display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',var(--mono);font-size:.72rem;color:var(--uc-text);
}
#latent-tool .lat-neighbor-item .lat-swatch{flex:0 0 auto}
#latent-tool .lat-neighbor-item .lat-neighbor-name{flex:0 0 auto;width:64px}
#latent-tool .lat-neighbor-bar-wrap{flex:1 1 auto;height:6px;background:var(--uc-bg);border-radius:3px;overflow:hidden}
#latent-tool .lat-neighbor-bar{height:100%;background:var(--lat-accent);border-radius:3px}
#latent-tool .lat-neighbor-item .lat-neighbor-val{flex:0 0 auto;width:36px;text-align:right;color:var(--uc-text-dim)}

#latent-tool button:focus-visible,#latent-tool input:focus-visible,#latent-tool select:focus-visible{outline:2px solid var(--lat-accent);outline-offset:2px}

@media(max-width:560px){
  #latent-tool .mt-stats{gap:14px}
  #latCanvas{height:280px}
  #latent-tool .lat-matrix-grid{grid-template-columns:repeat(4,1fr)}
}

/* tab shell — same pattern as #activation-tool's .act-tabs, lat- prefixed;
   underline stays --copper to match every other tool's tab chrome. */
#latent-tool .lat-tabs{
  display:flex;gap:2px;flex-wrap:wrap;margin-bottom:26px;border-bottom:1.5px solid var(--ink);
}
#latent-tool .lat-tabs button{
  appearance:none;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1.5px;
  padding:9px 16px;font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);cursor:pointer;
}
#latent-tool .lat-tabs button:hover{color:var(--ink);background:rgba(157,180,140,.18)}
#latent-tool .lat-tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--copper)}
#latent-tool .lat-tabs .lat-tabnum{color:var(--copper);margin-right:6px}
#latent-tool .lat-tabs button:focus-visible{outline:2px solid var(--copper);outline-offset:-2px}

#latent-tool .lat-panel-section{display:none}
#latent-tool .lat-panel-section.active{display:block;animation:reveal .3s ease}
@media (prefers-reduced-motion:reduce){#latent-tool .lat-panel-section.active{animation:none}}

/* ---------- timeline / flip-flop circuits reference ----------
   Reproduces a 1961 Popular Electronics article inside the standard
   plate frame. --ffd-* tokens are this doc's own aged-paper palette,
   scoped under #timeline so they can't leak into the blueprint theme;
   ff- classes are this page's own layout/components. ---------- */
#timeline{
  --ffd-bg:#fffdf9; --ffd-text:#1c1b18; --ffd-accent:#cc2200;
  --ffd-black:#111111; --ffd-border:#d8d2c4; --ffd-muted:#555148; --ffd-box:#f0ebe1;
}
#timeline .ff-doc{
  font-family:'Libre Baskerville',var(--sans);
  font-size:.92rem;line-height:1.6;color:var(--ffd-text);
  background:var(--ffd-bg);border:1px solid var(--ffd-border);
  padding:34px 40px;box-shadow:0 6px 20px rgba(0,0,0,.06);
}
#timeline .ff-kicker{
  font-family:'Public Sans',var(--sans);font-size:.95rem;font-weight:700;font-style:italic;
  color:var(--ffd-accent);text-transform:uppercase;letter-spacing:.03em;margin-bottom:6px;
}
#timeline .ff-title{
  font-family:'Oswald',var(--sans);font-size:2.6rem;font-weight:700;line-height:1.05;
  text-transform:uppercase;letter-spacing:.02em;color:var(--ffd-black);margin-bottom:10px;
}
#timeline .ff-byline{
  font-family:'Public Sans',var(--sans);font-size:.8rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.05em;color:var(--ffd-muted);border-top:1px solid var(--ffd-border);
  border-bottom:1px solid var(--ffd-border);padding:6px 0;margin-bottom:24px;
}
#timeline .ff-two-col{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-bottom:26px}
#timeline .ff-doc p{margin-bottom:14px;text-align:justify;text-justify:inter-word;text-indent:16px}
#timeline .ff-doc p.no-indent{text-indent:0}
#timeline .ff-dropcap::first-letter{
  font-family:'Oswald',var(--sans);font-size:2.9rem;float:left;line-height:.8;
  padding:4px 8px 0 2px;color:var(--ffd-black);font-weight:700;
}
#timeline .ff-section-head{
  font-family:'Oswald',var(--sans);font-size:1.4rem;font-weight:700;text-transform:uppercase;
  color:var(--ffd-black);margin:22px 0 10px;letter-spacing:.02em;
  border-bottom:2px solid var(--ffd-black);padding-bottom:3px;
}
#timeline .ff-callout{
  background:var(--ffd-box);border:1px solid var(--ffd-border);border-left:4px solid var(--ffd-black);
  padding:14px 18px;margin:0 0 18px;font-family:'Public Sans',var(--sans);font-size:.82rem;line-height:1.5;
}
#timeline .ff-callout p{text-indent:0;text-align:left;margin-bottom:0}
#timeline .ff-fig{
  margin:20px 0;text-align:center;background:#fff;border:1px solid var(--ffd-border);
  padding:10px;box-shadow:0 2px 8px rgba(0,0,0,.04);
}
#timeline .ff-fig img{max-width:100%;height:auto;display:block;margin:0 auto 8px;border:1px solid #e0dcd0}
#timeline .ff-fig figcaption{font-family:'Public Sans',var(--sans);font-size:.76rem;line-height:1.4;color:var(--ffd-muted);text-align:left;padding:0 4px}
#timeline .ff-fig figcaption strong{color:var(--ffd-black)}
#timeline .ff-page-break{margin:32px 0 24px;border-top:2px dashed var(--ffd-border);position:relative;text-align:center}
#timeline .ff-page-break span{
  position:relative;top:-11px;background:var(--ffd-bg);padding:0 14px;
  font-family:'Public Sans',var(--sans);font-size:.66rem;font-weight:700;color:var(--ffd-muted);
  text-transform:uppercase;letter-spacing:.08em;
}
#timeline .ff-continued{font-family:'Public Sans',var(--sans);font-size:.76rem;font-weight:700;font-style:italic;text-align:right;margin:16px 0;color:var(--ffd-muted)}
#timeline .ff-end{text-align:center;font-family:'Oswald',var(--sans);font-size:1.3rem;font-weight:700;color:var(--ffd-black);margin:28px 0;letter-spacing:.1em}
#timeline .ff-parts{
  border:2px dashed var(--ffd-black);padding:14px 18px;margin:16px 0;background:#faf7f0;
  font-family:'IBM Plex Mono',var(--mono);font-size:.74rem;line-height:1.5;
}
#timeline .ff-parts-title{font-family:'Oswald',var(--sans);font-size:1.05rem;font-weight:700;text-align:center;text-transform:uppercase;letter-spacing:.02em;margin-bottom:8px;border-bottom:1px solid var(--ffd-black);padding-bottom:4px}
#timeline .ff-source{margin-top:30px;padding-top:16px;border-top:1px solid var(--ffd-border);text-align:center;font-family:'Public Sans',var(--sans);font-size:.72rem;color:var(--ffd-muted)}

@media(max-width:820px){
  #timeline .ff-two-col{grid-template-columns:1fr;gap:16px}
  #timeline .ff-doc{padding:22px 20px}
  #timeline .ff-title{font-size:1.9rem}
}