:root{
  --bg:#060608; --bg2:#0e0e12; --bg3:#161519;
  --fg:#f3efef; --muted:#9a949b;
  --primary:#b81f35; --primary2:#d2304a;
  --silver:#c9cdd6; --star:#9fb4d8;
  --line:rgba(255,255,255,.09); --line-strong:rgba(255,255,255,.16);
  --sans:'Outfit',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:ui-monospace,'SF Mono','Cascadia Mono',Menlo,monospace;
  --t-micro:.625rem; --t-label:.6875rem;
  --e-out:cubic-bezier(.22,1,.36,1);
  --d-fast:220ms; --d-base:420ms;
  --flight:2.6s;
  --pulse:3.4s;
}
@media (prefers-reduced-motion:reduce){
  /* shortens, never zeroes */
  :root{ --d-fast:120ms; --d-base:200ms; --flight:1.1s; --pulse:1.6s; }
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--fg);font-family:var(--sans);font-weight:300;
  line-height:1.5;min-height:100vh;padding:clamp(14px,3vw,40px);overflow-x:hidden;
}
.wrap{max-width:1400px;margin:0 auto}

.masthead{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 24px;
  border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:18px;
}
.mark{font-size:var(--t-micro);letter-spacing:.42em;text-transform:uppercase;color:var(--muted);font-weight:500}

/* The wordmark, now a link home.
   Height 44px with the padding so the touch target clears the minimum without
   a visible box; `align-self:center` keeps it off the masthead's shared
   baseline, which the glyph would otherwise sit awkwardly against. */
.mark-home{
  display:inline-flex;align-items:center;gap:9px;align-self:center;
  min-height:44px;padding:6px 10px 6px 0;margin:-6px 0;
  text-decoration:none;color:var(--muted);
  transition:color var(--d-fast) var(--e-out);
}
.mark-home:hover,.mark-home:focus-visible{color:var(--fg)}
.mark-home:focus-visible{outline:1px solid var(--star);outline-offset:3px;border-radius:2px}
.mark-glyph{
  width:26px;height:26px;flex:none;display:block;
  /* `currentColor` on the strokes, so the whole mark warms with the wordmark on
     hover. Only the crimson core is fixed - it is the one locked brand note. */
  color:var(--silver);
  transition:color var(--d-fast) var(--e-out);
}
.mark-home:hover .mark-glyph,.mark-home:focus-visible .mark-glyph{color:var(--fg)}
.mark-word{letter-spacing:.42em;font-weight:500}
@media (max-width:520px){ .mark-glyph{width:22px;height:22px} }
h1{font-size:clamp(1.3rem,2.6vw,2rem);font-weight:600;letter-spacing:-.015em;line-height:1.12}
.cite{margin-left:auto;font-family:var(--mono);font-size:var(--t-micro);color:var(--muted)}
.sub{
  font-size:clamp(.88rem,1.3vw,1.02rem);color:var(--silver);max-width:70ch;
  line-height:1.6;margin-bottom:12px;font-weight:300;
}
.lede{font-size:.88rem;color:var(--muted);max-width:74ch;line-height:1.66;margin-bottom:24px}
.lede b{color:var(--silver);font-weight:500}

/* ---------- section furniture ---------- */
.panel{background:var(--bg2);border:1px solid var(--line);border-radius:3px;padding:clamp(13px,1.9vw,20px)}
.ph{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:13px;flex-wrap:wrap}
.ph h2{font-size:var(--t-micro);letter-spacing:.28em;text-transform:uppercase;color:var(--muted);font-weight:500}
.ph .hint{font-family:var(--mono);font-size:var(--t-micro);color:var(--muted)}
.secmark{
  display:flex;align-items:baseline;gap:12px;margin:30px 0 12px;
  font-family:var(--mono);font-size:var(--t-micro);letter-spacing:.24em;
  text-transform:uppercase;color:var(--muted);
}
.secmark::after{content:'';flex:1;height:1px;background:var(--line)}
.secmark b{color:var(--silver);font-weight:600}

/* ---------- transport ---------- */
.transport{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  background:var(--bg2);border:1px solid var(--line);border-radius:3px;
  padding:10px 12px;margin-bottom:14px;
}
.tbtn{
  font-family:var(--mono);font-size:var(--t-label);letter-spacing:.08em;text-transform:uppercase;
  background:transparent;color:var(--muted);border:1px solid var(--line);
  padding:9px 14px;border-radius:2px;cursor:pointer;min-height:44px;
  transition:color var(--d-fast) var(--e-out),border-color var(--d-fast) var(--e-out);
}
.tbtn:hover,.tbtn:focus-visible{color:var(--fg);border-color:var(--line-strong);outline:none}
.tbtn:focus-visible{outline:1px solid var(--star);outline-offset:3px}
.tbtn.go{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}
.tbtn.go:hover{background:var(--primary2);border-color:var(--primary2);color:#fff}
.tbtn[disabled]{opacity:.45;cursor:default}
.tstate{
  margin-left:auto;font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);
  letter-spacing:.08em;text-transform:uppercase;padding-right:4px;
}
.tstate b{color:var(--fg);font-weight:600}

/* ---------- stage (graph) ---------- */
.stage{
  position:relative;background:var(--bg2);border:1px solid var(--line);border-radius:3px;
  padding:clamp(9px,1.5vw,18px);
  /* pan-x AND pan-y: the diagram scrolls sideways, the page still scrolls down.
     Never `none` - that was the production regression. */
  touch-action:pan-x pan-y;
  overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;
  scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;
}
.stage::-webkit-scrollbar{height:6px}
.stage::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:3px}
.stage svg{display:block;width:100%;height:auto}
/* The stacked graph fits the viewport, so nothing pans and nothing is off-screen. */
@media (max-width:900px){
  .stage{overflow-x:hidden;touch-action:pan-y}
  .stage svg{width:100%;max-width:none;height:auto}
}
.panhint{
  display:none;font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);
  letter-spacing:.14em;text-transform:uppercase;margin-top:8px;
}
@media (max-width:900px){ .panhint{display:block} }

.edge{fill:none;stroke:var(--line-strong);stroke-width:1.25}
.edge.dim{stroke:var(--line)}
.edge.live{stroke:var(--silver);stroke-width:1.75}
.edge-shimmer{fill:none;stroke:var(--star);stroke-width:2;opacity:0;stroke-dasharray:16 340;stroke-linecap:round}
.edge-shimmer.on{opacity:.75;animation:dash var(--pulse) linear infinite}
@keyframes dash{ from{stroke-dashoffset:356} to{stroke-dashoffset:0} }

.node rect{fill:var(--bg3);stroke:var(--line);stroke-width:1;
  transition:stroke var(--d-base) var(--e-out),fill var(--d-base) var(--e-out)}
.node.on rect{stroke:var(--silver);fill:#1c1a20}
.node.fired rect{stroke:var(--star)}
.node.off rect{opacity:.42}
.node .ttl{font-family:var(--sans);font-size:12.5px;font-weight:600;fill:var(--fg);
  transition:fill var(--d-base) var(--e-out)}
.node.off .ttl{fill:var(--muted)}
.node .sub{font-family:var(--mono);font-size:9px;fill:var(--muted);letter-spacing:.07em}
.badge rect{stroke:none}
.badge text{font-family:var(--mono);font-size:9.5px;font-weight:700;letter-spacing:.1em}

.pk circle{stroke:var(--bg);stroke-width:1.4}
.pk text{font-family:var(--mono);font-size:8.5px;font-weight:700;text-anchor:middle}
.pk.above circle{fill:var(--star)} .pk.below circle{fill:var(--primary2)}
.pk.above text,.pk.below text{fill:#0b0d12}
.pk.mid circle{fill:var(--silver)} .pk.mid text{fill:#111}

.axisrail{stroke:var(--line);stroke-width:1}
.railtick{font-family:var(--mono);font-size:8px;fill:var(--muted)}
.railth{stroke-width:1.4;stroke-dasharray:4 3}
.railth.up{stroke:var(--star)} .railth.dn{stroke:var(--primary2)}
.raillab{font-family:var(--mono);font-size:8.5px;font-weight:600}
.raillab.up{fill:var(--star)} .raillab.dn{fill:var(--primary2)}

/* ---------- coupling banner ---------- */
.tether{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;margin-top:12px;
  border:1px solid var(--line);border-left:2px solid var(--star);border-radius:2px;
  background:rgba(159,180,216,.045);padding:10px 13px;
  font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);letter-spacing:.06em;
}
.tether b{color:var(--fg);font-weight:600;letter-spacing:.1em}
.tether .now{color:var(--silver)}

/* ---------- main split ---------- */
.split{display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:1080px){ .split{grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:22px} }
.panel + .panel{margin-top:16px}

/* ---------- the map ---------- */
.map{position:relative;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.map svg{display:block;width:100%;height:auto;overflow:visible;cursor:crosshair}
.regfill{transition:opacity var(--d-base) var(--e-out)}
.reg-cor{fill:rgba(159,180,216,.16)}
.reg-amb{fill:rgba(255,255,255,.035)}
.reg-inc{fill:rgba(184,31,53,.20)}
.reg-cor-h{fill:url(#hatchUp)}
.reg-inc-h{fill:url(#hatchDn)}
.regline{stroke:var(--line-strong);stroke-width:1;fill:none}
.regcap{font-family:var(--mono);font-size:10.5px;font-weight:700;letter-spacing:.14em;fill:var(--fg);pointer-events:none}
.regsub{font-family:var(--mono);font-size:8.5px;fill:var(--muted);pointer-events:none;letter-spacing:.06em}
.mapgrid{stroke:var(--line);stroke-width:.75}
.mapaxis{stroke:var(--line-strong);stroke-width:1}
.maptick{font-family:var(--mono);font-size:9px;fill:var(--muted)}
.maplab{font-family:var(--mono);font-size:9px;fill:var(--muted);letter-spacing:.18em;text-transform:uppercase}
.illegal{fill:rgba(0,0,0,.55);stroke:var(--line);stroke-width:1;stroke-dasharray:3 3}
.illegal-t{font-family:var(--mono);font-size:9px;fill:var(--muted);letter-spacing:.06em}

.lm{cursor:pointer}
.lm circle{fill:none;stroke:var(--silver);stroke-width:1.25;transition:stroke var(--d-fast) var(--e-out)}
.lm text{font-family:var(--mono);font-size:9px;fill:var(--muted);letter-spacing:.04em}
.lm:hover circle,.lm:focus-visible circle{stroke:var(--fg)}
.lm:hover text,.lm:focus-visible text{fill:var(--fg)}
.lm.here circle{stroke:var(--fg);stroke-width:2}
.lm.here text{fill:var(--fg);font-weight:700}

#puck{cursor:grab}
#puck:active{cursor:grabbing}
.puck-halo{fill:none;stroke:var(--fg);stroke-width:1;opacity:.28}
.puck-core{fill:var(--fg);stroke:var(--bg);stroke-width:2}
.puck-x,.puck-y{stroke:var(--fg);stroke-width:1;stroke-dasharray:3 4;opacity:.4}

/* ---------- score ribbon ---------- */
.ribbon{margin-top:16px;touch-action:pan-y}
.ribbon svg{display:block;width:100%;height:auto;overflow:visible}
.rbtrack{stroke:var(--line-strong);stroke-width:1}
.rbtick{font-family:var(--mono);font-size:8.5px;fill:var(--muted)}
.rbzone{transition:x var(--d-base) var(--e-out),width var(--d-base) var(--e-out)}
.rbdoc{transition:fill var(--d-base) var(--e-out)}
.rbid{font-family:var(--mono);font-size:8.5px;font-weight:700;letter-spacing:.02em}
.rbglyph{font-family:var(--mono);font-size:10px;font-weight:700}

/* ---------- verdict ---------- */
.verdict{border:1px solid var(--line-strong);border-radius:3px;background:var(--bg3);padding:17px}
.vhead{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:11px}
.vb{font-family:var(--mono);font-size:var(--t-label);font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;padding:6px 11px;border-radius:2px}
.vb[data-a=correct]{background:var(--star);color:#0b0f18}
.vb[data-a=ambiguous]{background:var(--silver);color:#111}
.vb[data-a=incorrect]{background:var(--primary);color:#fff}
.vcount{font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);letter-spacing:.06em}
.vcount b{color:var(--fg);font-weight:600}
.vtext{font-size:.85rem;color:var(--silver);line-height:1.6}
.vtext b{color:var(--fg);font-weight:500}

.flip{margin-top:15px;padding:14px 16px;border:1px solid var(--line);border-radius:2px;background:rgba(255,255,255,.014)}
.flip .fl{font-family:var(--mono);font-size:var(--t-micro);letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);display:block;margin-bottom:8px}
.flip .fv{font-family:var(--mono);font-size:.85rem;color:var(--fg);line-height:1.9}
.flip .fv span{color:var(--muted)}

.brs{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:15px}
.br{border:1px solid var(--line);border-radius:2px;padding:13px;background:var(--bg3);
  transition:background-color var(--d-base) var(--e-out),border-color var(--d-base) var(--e-out)}
.br[data-on=false]{background:var(--bg2)}
.br[data-on=true]{border-color:var(--line-strong)}
.br h3{font-size:var(--t-label);letter-spacing:.14em;text-transform:uppercase;font-weight:600;
  margin-bottom:5px;display:flex;align-items:center;gap:7px;color:var(--muted)}
.br[data-on=true] h3{color:var(--fg)}
.br .sw{font-family:var(--mono);font-size:var(--t-micro);font-weight:700;border:1px solid currentColor;
  padding:1px 5px;border-radius:2px}
.br[data-on=true] .sw{color:var(--star)} .br[data-on=false] .sw{color:var(--muted)}
.br p{font-size:.75rem;color:var(--muted);line-height:1.5}
.br code{font-family:var(--mono);font-size:.7rem;color:var(--silver)}

/* ---------- sliders ---------- */
.slid{margin-bottom:16px}
.slid:last-of-type{margin-bottom:0}
.slid-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px;gap:10px}
.slid-name{font-size:var(--t-micro);letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.slid-val{font-family:var(--mono);font-size:.9rem;font-weight:600;color:var(--fg)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:28px;background:transparent;
  cursor:pointer;touch-action:pan-y;display:block}
input[type=range]:focus{outline:none}
input[type=range]:focus-visible{outline:1px solid var(--star);outline-offset:4px}
input[type=range]::-webkit-slider-runnable-track{height:2px;background:var(--line-strong)}
input[type=range]::-moz-range-track{height:2px;background:var(--line-strong)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:13px;height:22px;
  margin-top:-10px;background:var(--fg);border:0;border-radius:1px}
input[type=range]::-moz-range-thumb{width:13px;height:22px;background:var(--fg);border:0;border-radius:1px}
#sUp::-webkit-slider-thumb{background:var(--star)} #sUp::-moz-range-thumb{background:var(--star)}
#sDn::-webkit-slider-thumb{background:var(--primary2)} #sDn::-moz-range-thumb{background:var(--primary2)}
.helper{font-size:.74rem;color:var(--muted);line-height:1.5;margin-top:4px}
.scale-cap{font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);letter-spacing:.12em;
  margin-top:12px;display:block}

/* ---------- log ---------- */
.log{font-family:var(--mono);font-size:.72rem;line-height:1.85;color:var(--muted);
  max-height:230px;overflow-y:auto}
.log div{opacity:0;animation:fadein var(--d-base) var(--e-out) forwards}
@keyframes fadein{to{opacity:1}}
.log .t{color:var(--fg);font-weight:600}
.log .k{color:var(--star)}
.log .x{color:var(--primary2)}

/* ---------- strips ---------- */
.strip{display:grid;grid-template-columns:22px 1fr 54px 16px;gap:9px;align-items:center;
  padding:8px 9px;border:1px solid var(--line);border-radius:2px;margin-bottom:5px;
  transition:background-color var(--d-base) var(--e-out),border-color var(--d-base) var(--e-out)}
.strip[data-kept=false]{background:var(--bg);border-style:dashed}
.strip .sn{font-family:var(--mono);font-size:var(--t-micro);color:var(--muted)}
.strip .st{font-size:.75rem;color:var(--silver);line-height:1.35}
.strip[data-kept=false] .st{text-decoration:line-through;color:var(--muted)}
.strip .sv{font-family:var(--mono);font-size:.71rem;font-weight:600;text-align:right;color:var(--fg)}
.strip[data-kept=false] .sv{color:var(--muted)}
.strip .sk{font-family:var(--mono);font-size:.76rem;font-weight:700;text-align:center}
.strip[data-kept=true] .sk{color:var(--star)} .strip[data-kept=false] .sk{color:var(--muted)}
.recomp{margin-top:12px;padding:13px;border:1px solid var(--line-strong);border-radius:2px;
  background:var(--bg);font-size:.79rem;line-height:1.6}
.recomp .rl{display:block;font-family:var(--mono);font-size:var(--t-micro);letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);margin-bottom:7px}
.recomp mark{background:rgba(159,180,216,.16);color:var(--fg);padding:1px 0}
.ord{font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);margin-top:9px;display:block}

.bottom{display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:1080px){ .bottom{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:22px} }
.prose{font-size:.84rem;color:var(--silver);line-height:1.68}
.prose + .prose{margin-top:12px}
.prose b{color:var(--fg);font-weight:500}

/* ---------- exit ---------- */
/* Pill geometry lifted from .paper__exit (src/styles/paper-game.css): same
   999px radius, same translucent ground, same crimson on hover. Visible at
   rest - a way out that only appears on hover reads as a broken feature. */
.exitbar{display:flex;margin-top:34px}
.exit{
  display:inline-flex;align-items:center;gap:10px;
  min-height:44px;padding:12px 22px;
  font-family:var(--mono);font-size:var(--t-label);letter-spacing:.18em;text-transform:uppercase;
  /* --silver on --bg is 10.4:1; --muted would be 5.6:1. Both clear 4.5, this one
     also carries the weight the element needs at the end of a long page. */
  color:var(--silver);text-decoration:none;
  border:1px solid var(--line-strong);border-radius:999px;
  background:rgba(255,255,255,.02);
  transition:color var(--d-fast) var(--e-out),border-color var(--d-fast) var(--e-out),
             background-color var(--d-fast) var(--e-out);
}
.exit:hover,.exit:focus-visible{color:var(--fg);border-color:var(--primary2);background:rgba(210,48,74,.08)}
.exit:focus-visible{outline:1px solid var(--star);outline-offset:3px}
.exit-arrow{font-size:.95rem;line-height:1;transition:transform var(--d-fast) var(--e-out)}
.exit:hover .exit-arrow{transform:translateX(-3px)}
@media (prefers-reduced-motion:reduce){ .exit:hover .exit-arrow{transform:none} }

.foot{margin-top:28px;padding-top:16px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:var(--t-micro);color:var(--muted);line-height:1.95}
.foot b{color:var(--silver);font-weight:500}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}