/* FOIL — engineering-paper instrument.
   Committed single look: cool paper ground, ink type, hairline rules.
   Colour is semantic: one hue per basin the listener falls into. */

:root{
  --paper:      #E6EAEE;
  --paper-hi:   #F1F4F6;
  --paper-lo:   #DCE2E7;
  --ink:        #0F151C;
  --ink-2:      #47535F;
  --ink-3:      #78858F;
  --rule:       #BFC9D2;
  --rule-hi:    #D3DBE2;

  /* Basins. Teal = the correct route. Copper = the unruled-out attractor. */
  --basin-a:    #0C6B70;
  --basin-a-lo: #C9E0E1;
  --basin-b:    #A2551C;
  --basin-b-lo: #EBD9C6;
  --unmeasured: #AEB9C3;

  /* System-first: no webfont fetch, no flash, works with zero network egress.
     The instrument aesthetic wants a real terminal mono, which every target
     platform already ships. */
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

  --wrap: 1140px;
  --gut: clamp(20px, 5vw, 56px);
}

*{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
.wrap{ max-width:var(--wrap); margin:0 auto; padding-inline:var(--gut); }
.wrap.narrow{ max-width:760px; }

em{ font-style:normal; color:var(--basin-b); }
b{ font-weight:600; }

/* ── masthead ─────────────────────────────────────────────── */
.masthead{ border-bottom:1px solid var(--rule); background:var(--paper-hi); }
.masthead-in{
  display:flex; align-items:baseline; justify-content:space-between;
  gap:24px; padding-block:16px; flex-wrap:wrap;
}
.wordmark{
  font-family:var(--mono); font-weight:600; font-size:20px;
  letter-spacing:.34em; text-indent:.34em;
}
.wordmark.small{ font-size:15px; }
.masthead-meta{
  font-family:var(--mono); font-size:11.5px; font-weight:400;
  letter-spacing:.09em; color:var(--ink-3); text-transform:uppercase;
}
.sep{ color:var(--rule); padding-inline:6px; }

/* ── hero ─────────────────────────────────────────────────── */
.hero{ padding-block:clamp(48px,8vw,92px) clamp(40px,6vw,72px); }
.eyebrow{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.16em;
  text-transform:uppercase; color:var(--ink-3); margin:0 0 22px;
}
h1{
  font-family:var(--mono);
  font-weight:300;
  font-size:clamp(29px,5.4vw,58px);
  line-height:1.14;
  letter-spacing:-.022em;
  margin:0 0 clamp(36px,5vw,56px);
  max-width:24ch;
}
.lede{
  max-width:62ch; color:var(--ink-2); font-size:16.5px;
  margin:clamp(30px,4vw,44px) 0 0;
}

/* ── the swap demo ────────────────────────────────────────── */
.swapdemo{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:clamp(14px,2.5vw,30px);
  align-items:stretch;
}
.swapcol{ display:flex; flex-direction:column; }
.swaphead{ margin-bottom:10px; }
.tag{
  font-family:var(--mono); font-size:11px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--ink-3);
}

.reportlist{ list-style:none; margin:0; padding:0; display:grid; gap:6px; }
.reportlist li{
  background:var(--paper-hi);
  border:1px solid var(--rule-hi);
  border-left:3px solid var(--rule);
  padding:11px 13px;
  font-family:var(--mono); font-size:12.5px; line-height:1.45;
  color:var(--ink-2);
  display:flex; gap:10px; align-items:baseline;
}
.reportlist li .who{
  color:var(--ink); font-weight:500; flex:0 0 auto; min-width:5.4em;
}
.reportlist li.moved{
  border-left-color:var(--basin-b);
  background:var(--basin-b-lo);
  color:var(--ink);
}
.reportlist li.liar .who::after{
  content:"·"; color:var(--basin-b); margin-left:.45em; font-weight:700;
}

.swapaxis{
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:10px; padding-top:26px;
}
.swapaxis-rule{ width:1px; flex:1; background:var(--rule); min-height:22px; }
.swapaxis-note{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.09em;
  text-transform:uppercase; color:var(--ink-3); text-align:center; line-height:1.4;
}

.readout{
  margin-top:12px; padding:16px 14px 13px;
  border:1px solid var(--rule); background:var(--paper-hi);
  text-align:center;
}
.readout-val{
  font-family:var(--mono); font-weight:400;
  font-size:clamp(34px,6vw,52px); line-height:1; letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
}
.readout-lab{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.13em;
  text-transform:uppercase; color:var(--ink-3); margin-top:9px;
}
.readout-a{ border-color:var(--basin-a); }
.readout-a .readout-val{ color:var(--basin-a); }
.readout-b{ border-color:var(--basin-b); }
.readout-b .readout-val{ color:var(--basin-b); }

/* ── bands ────────────────────────────────────────────────── */
.band{ padding-block:clamp(46px,6.5vw,80px); border-top:1px solid var(--rule); }
.band-lab{ background:var(--paper-hi); }
.band-run{ background:var(--paper-hi); }
.band-dark{ background:var(--ink); color:#C9D2DA; border-top-color:var(--ink); }
.band-dark .sec{ color:#F2F5F7; }
.band-dark .sec::before{ background:var(--basin-b); }
.band-dark em{ color:#E4A46B; }

h2.sec{
  font-family:var(--mono); font-weight:500;
  font-size:clamp(19px,2.5vw,25px); letter-spacing:-.012em;
  margin:0 0 20px; padding-top:14px; position:relative;
}
h2.sec::before{
  content:""; position:absolute; top:0; left:0; width:46px; height:2px;
  background:var(--ink);
}
.band p{ max-width:66ch; }
.sub{ color:var(--ink-2); font-size:16px; max-width:66ch; }
.band-dark p{ color:#AEBAC4; }

/* ── kill box ─────────────────────────────────────────────── */
.killbox{ margin-top:30px; border:1px solid var(--rule); background:var(--paper-hi); }
.killrow{
  display:flex; justify-content:space-between; align-items:baseline; gap:18px;
  padding:13px 16px; border-bottom:1px solid var(--rule-hi);
  font-family:var(--mono); font-size:13px;
}
.killrow:last-child{ border-bottom:0; }
.killrow span{ color:var(--ink-2); font-size:12.5px; }
.killrow b{ font-variant-numeric:tabular-nums; font-weight:500; font-size:15px; }
.killrow-v{ background:var(--paper-lo); }
.kill{ color:var(--basin-b); letter-spacing:.13em; font-weight:600; }

/* ── lab ──────────────────────────────────────────────────── */
.lab{
  display:grid; grid-template-columns:1.15fr .85fr;
  gap:clamp(18px,3vw,40px); margin-top:30px; align-items:start;
}
.reportlist-live li{
  cursor:grab; user-select:none; background:var(--paper);
  transition:border-color .12s ease, background .12s ease;
}
.reportlist-live li:active{ cursor:grabbing; }
.reportlist-live li.dragging{ opacity:.4; }
.reportlist-live li.over{ border-left-color:var(--basin-a); }
.reportlist-live li .grip{
  margin-left:auto; display:flex; gap:2px; flex:0 0 auto;
}
.reportlist-live li .grip button{
  font-family:var(--mono); font-size:12px; line-height:1;
  width:24px; height:24px; padding:0; cursor:pointer;
  background:var(--paper-hi); border:1px solid var(--rule);
  color:var(--ink-2);
}
.reportlist-live li .grip button:hover:not(:disabled){
  background:var(--ink); color:var(--paper-hi); border-color:var(--ink);
}
.reportlist-live li .grip button:disabled{ opacity:.3; cursor:default; }

.lab-controls{ display:flex; gap:9px; margin-top:14px; flex-wrap:wrap; }
.btn{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.08em;
  text-transform:uppercase; padding:9px 14px; cursor:pointer;
  background:transparent; border:1px solid var(--ink); color:var(--ink);
}
.btn:hover{ background:var(--ink); color:var(--paper-hi); }
.btn-alt{ border-color:var(--basin-b); color:var(--basin-b); }
.btn-alt:hover{ background:var(--basin-b); color:var(--paper-hi); border-color:var(--basin-b); }

.panel{ border:1px solid var(--rule); background:var(--paper); }
.panel.unmeasured{ border-style:dashed; }
.panel-head{
  display:flex; justify-content:space-between; align-items:baseline;
  padding:12px 15px; border-bottom:1px solid var(--rule-hi);
}
.panel-title{
  font-family:var(--mono); font-size:11px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--ink-3);
}
.panel-n{ font-family:var(--mono); font-size:11px; color:var(--ink-3); }
.bars{ padding:16px 15px 6px; min-height:186px; }
.bar{ margin-bottom:14px; }
.bar-top{
  display:flex; justify-content:space-between; align-items:baseline;
  font-family:var(--mono); font-size:12px; margin-bottom:5px;
}
.bar-name{ color:var(--ink-2); }
.bar-name .mark{
  font-size:10px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-3); margin-left:7px;
}
.bar-val{ font-variant-numeric:tabular-nums; color:var(--ink); }
.bar-track{ height:9px; background:var(--paper-lo); }
.bar-fill{ height:100%; width:0; transition:width .42s cubic-bezier(.2,.7,.3,1); }
.bar-a .bar-fill{ background:var(--basin-a); }
.bar-a .bar-val{ color:var(--basin-a); }
.bar-b .bar-fill{ background:var(--basin-b); }
.bar-b .bar-val{ color:var(--basin-b); }
.bar-z .bar-fill{ background:var(--unmeasured); }
.panel-foot{
  padding:12px 15px; border-top:1px solid var(--rule-hi);
  font-family:var(--mono); font-size:11.5px; line-height:1.55; color:var(--ink-2);
  min-height:44px;
}
.blank{
  display:flex; align-items:center; justify-content:center;
  min-height:186px; text-align:center; padding:20px;
  font-family:var(--mono); font-size:12.5px; line-height:1.7; color:var(--ink-3);
}

/* ── lattice ──────────────────────────────────────────────── */
.lattice{
  display:grid; grid-template-columns:repeat(auto-fill, minmax(148px,1fr));
  gap:7px; margin-top:28px;
}
.cell{
  border:1px solid var(--rule); background:transparent;
  padding:10px 11px; text-align:left; cursor:default;
  font-family:var(--mono); font-size:11px; line-height:1.5; color:var(--ink-3);
  display:flex; flex-direction:column; gap:6px;
}
.cell .seq{ letter-spacing:.06em; }
.cell .out{ font-variant-numeric:tabular-nums; font-size:14px; }
.cell.m{ cursor:pointer; color:var(--ink-2); }
.cell.m-a{ background:var(--basin-a-lo); border-color:var(--basin-a); }
.cell.m-a .out{ color:var(--basin-a); }
.cell.m-b{ background:var(--basin-b-lo); border-color:var(--basin-b); }
.cell.m-b .out{ color:var(--basin-b); }
.cell.m:hover, .cell.m:focus-visible{ outline:2px solid var(--ink); outline-offset:1px; }
.cell.sel{ outline:2px solid var(--ink); outline-offset:1px; }
.cell .out.none{ color:var(--unmeasured); font-size:11px; letter-spacing:.09em; }

.legend{
  display:flex; gap:22px; flex-wrap:wrap; margin-top:20px;
  font-family:var(--mono); font-size:11.5px; color:var(--ink-2);
}
.lg{ display:flex; align-items:center; gap:8px; }
.sw{ width:13px; height:13px; display:inline-block; border:1px solid var(--rule); }
.sw-a{ background:var(--basin-a-lo); border-color:var(--basin-a); }
.sw-b{ background:var(--basin-b-lo); border-color:var(--basin-b); }
.sw-u{ background:transparent; }

/* ── findings ─────────────────────────────────────────────── */
.findings{ margin-top:30px; }
.finding{
  display:grid; grid-template-columns:minmax(0,1fr) 2fr auto;
  gap:16px; align-items:center; padding-block:11px;
  border-bottom:1px solid #2A343E;
}
.fnum{ font-family:var(--mono); font-size:12.5px; color:#C9D2DA; }
.fbar{ height:8px; background:#212A33; }
.fbar i{ display:block; height:100%; background:#E4A46B; }
.fval{
  font-family:var(--mono); font-size:15px; font-variant-numeric:tabular-nums;
  color:#E4A46B;
}
.fnote{ margin-top:16px; font-size:14.5px; }

/* ── ledger ───────────────────────────────────────────────── */
.ledger{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(20px,3vw,40px); margin-top:26px; }
.ledger h3{
  font-family:var(--mono); font-size:12px; letter-spacing:.13em;
  text-transform:uppercase; font-weight:500; margin:0 0 12px; padding-bottom:8px;
  border-bottom:1px solid var(--rule);
}
.col-yes h3{ color:var(--basin-a); border-bottom-color:var(--basin-a); }
.col-no h3{ color:var(--basin-b); border-bottom-color:var(--basin-b); }
.ledger ul{ margin:0; padding-left:17px; }
.ledger li{ margin-bottom:9px; font-size:14.5px; color:var(--ink-2); line-height:1.55; }
.statusline{
  margin-top:30px; padding:16px 18px; background:var(--paper-hi);
  border-left:3px solid var(--ink); font-size:14.5px; color:var(--ink-2);
  max-width:none;
}

/* ── code ─────────────────────────────────────────────────── */
.code{
  background:var(--ink); color:#CBD5DD; padding:18px 20px; overflow-x:auto;
  font-family:var(--mono); font-size:13px; line-height:1.75; margin:24px 0;
}
.code .c{ color:#6F8090; }

/* ── footer ───────────────────────────────────────────────── */
.foot{ border-top:1px solid var(--rule); padding-block:34px 46px; background:var(--paper-hi); }
.foot-in{ display:flex; justify-content:space-between; gap:34px; flex-wrap:wrap; }
.foot-note{ font-family:var(--mono); font-size:11.5px; color:var(--ink-3); margin:10px 0 0; }
.foot-meta{ max-width:46ch; }
.foot-meta p{ font-size:12.5px; color:var(--ink-3); margin:0 0 7px; line-height:1.6; }

/* ── responsive ───────────────────────────────────────────── */
@media (max-width:860px){
  .lab{ grid-template-columns:1fr; }
  .ledger{ grid-template-columns:1fr; }
  .swapdemo{ grid-template-columns:1fr; gap:8px; }
  .swapaxis{ flex-direction:row; padding-top:0; padding-block:4px; }
  .swapaxis-rule{ width:auto; height:1px; flex:1; min-height:0; }
  .finding{ grid-template-columns:1fr auto; }
  .finding .fbar{ grid-column:1 / -1; order:3; }
}
@media (max-width:520px){
  body{ font-size:16px; }
  .reportlist li{ flex-wrap:wrap; font-size:12px; }
  .reportlist li .who{ min-width:0; }
}

/* ── a11y floor ───────────────────────────────────────────── */
:focus-visible{ outline:2px solid var(--basin-a); outline-offset:2px; }
.band-dark :focus-visible{ outline-color:#E4A46B; }
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{ animation:none !important; transition:none !important; }
}

/* ── v2 section ───────────────────────────────────────────── */
h3.subhead{
  font-family:var(--mono); font-size:13px; letter-spacing:.11em;
  text-transform:uppercase; font-weight:500; color:var(--ink);
  margin:34px 0 12px; padding-bottom:8px; border-bottom:1px solid var(--rule);
}
.crosstab{
  display:grid; grid-template-columns:minmax(0,1.6fr) 1fr 1fr;
  border:1px solid var(--rule); background:var(--paper); margin:18px 0 22px;
  font-family:var(--mono);
}
.crosstab > *{ padding:11px 14px; border-bottom:1px solid var(--rule-hi); }
.crosstab > *:nth-last-child(-n+3){ border-bottom:0; }
.ct-h{
  font-size:10.5px; letter-spacing:.13em; text-transform:uppercase;
  color:var(--ink-3); text-align:right; background:var(--paper-lo);
}
.ct-r{ font-size:12px; color:var(--ink-2); }
.ct-v{
  text-align:right; font-size:16px; font-variant-numeric:tabular-nums;
  color:var(--ink-3);
}
.ct-hit{ color:var(--basin-b); font-weight:500; }
.caveat{
  border-left:3px solid var(--basin-b); background:var(--paper);
  padding:14px 16px; font-size:14.5px; color:var(--ink-2); max-width:none;
}