/* ── Page palette ─────────────────────────── */
:root{
  /* the header floats over the slides rather than sitting above them,
     so a step gets the whole viewport */
  --header-h:0rem;
}

/* ── Site chrome ──────────────────────────
   The header lives outside the scroller and steps aside after the cover
   so the remaining visual sequence can use the full viewport. */
.site-header{
  left:0;
  position:fixed;
  right:0;
  top:0;
  transition:opacity .4s ease,transform .4s ease;
}
body[data-chrome="hidden"] .site-header{
  opacity:0;
  pointer-events:none;
  transform:translateY(-100%);
}
.slide--cover{padding-top:6.5rem}

/* ── Step dots (floating) ─────────────────── */
.step-dots-wrap{
  pointer-events:none;
  position:fixed;
  right:1.5rem;
  top:50%;
  transform:translateY(-50%);
  z-index:50;
}
.step-dots{
  background:rgba(255,255,255,.82);
  border:1px solid rgba(27,29,33,.1);
  border-radius:999px;
  box-shadow:0 2px 12px rgba(22,28,38,.1);
  display:flex;
  flex-direction:column;
  gap:.4rem;
  padding:.6rem .4rem;
  pointer-events:auto;
}
.step-dot{
  background:rgba(27,29,33,.18);
  border-radius:2px;
  cursor:pointer;
  height:.9rem;
  transition:background .22s ease,height .22s ease;
  width:.38rem;
}
.step-dot.is-active{background:#6b50a2;height:1.6rem}

/* ── Scroll-snap container ─────────────── */
.snap-wrap{
  height:calc(100vh - var(--header-h));
  overflow-y:scroll;
  scroll-behavior:smooth;
  scroll-snap-type:y mandatory;
}

/* ── Each slide ────────────────────────── */
.slide{
  align-items:center;
  display:grid;
  gap:clamp(1.5rem,3vw,3rem);
  grid-template-columns:1fr 1.3fr;
  height:calc(100vh - var(--header-h));
  padding:clamp(1.25rem,3vw,2.5rem) clamp(1.25rem,4vw,3.5rem);
  scroll-snap-align:start;
}

/* ── Page palette ──────────────────────────
   Color carries one meaning each:
     gold   = light, the thing that travels
     violet = time and spacetime
     teal   = mass, and what it does
     pale   = you, the observer
   Anything outside that set stays neutral, so a color on screen
   always answers "which of the four am I looking at?"              */
.slide{
  --t-text:#29231e;
  --t-dim:#4e4941;
  --t-line:rgba(41,35,30,.15);
  --t-rule:rgba(41,35,30,.45);
  --t-card:#fff;
  --t-trough:#efe9e0;
  --t-field:#fffdf8;
  --t-ground:#ffffff;
  --t-light:#935d12;
  --t-light-soft:rgba(147,93,18,.12);
  --t-time:#55407f;
  --t-time-soft:rgba(85,64,127,.09);
  --t-mass:#2c7566;
  --t-mass-soft:rgba(44,117,102,.1);
  --t-warn:#ad4b57;
  --t-warn-soft:rgba(173,75,87,.09);
  --t-observer:#5c6478;
  background:var(--t-ground);
  color:var(--t-text);
}

/* Dark mode uses one continuous black canvas. */
html[data-theme="dark"] .slide{
  --t-text:#eceffb;
  --t-dim:#a3accb;
  --t-line:rgba(199,209,255,.15);
  --t-rule:rgba(199,209,255,.34);
  --t-card:rgba(255,255,255,.05);
  --t-trough:rgba(255,255,255,.08);
  --t-field:#0d1118;
  --t-ground:#000000;
  --t-light:#f0bd63;
  --t-light-soft:rgba(240,189,99,.15);
  --t-time:#b7a4f2;
  --t-time-soft:rgba(183,164,242,.14);
  --t-mass:#5ec8c0;
  --t-mass-soft:rgba(94,200,192,.13);
  --t-warn:#ec9ba4;
  --t-warn-soft:rgba(236,155,164,.13);
  --t-observer:#cfd8f5;
}

html[data-theme="dark"] .step-dots{
  background:rgba(16,20,38,.8);
  border-color:rgba(199,209,255,.16);
  box-shadow:0 2px 12px rgba(0,0,0,.35);
}
html[data-theme="dark"] .step-dot{background:rgba(199,209,255,.26)}
html[data-theme="dark"] .step-dot.is-active{background:#b7a4f2}

/* ── Left: heading ─────────────────────── */
.slide-copy{display:flex;flex-direction:column;justify-content:center}

/* one small marker instead of a 6rem numeral above an eyebrow: the
   step number and what the step is about, on a single line */
.slide-step{
  align-items:baseline;
  color:var(--t-dim);
  display:flex;
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.1em;
  margin:0 0 .85rem;
  text-transform:uppercase;
}
.slide-step b{color:var(--t-time);font-variant-numeric:tabular-nums}
.slide-step span{
  border-left:1px solid var(--t-line);
  margin-left:.7rem;
  padding-left:.7rem;
}

.slide-copy h2{
  color:var(--t-text);
  font-family:var(--font-display);
  font-size:clamp(2.2rem,4vw,3.6rem);
  letter-spacing:-.03em;
  line-height:1.08;
  margin-bottom:.6rem;
}

.slide-hint{
  color:var(--t-dim);
  font-size:.95rem;
  line-height:1.6;
  max-width:26rem;
}

.slide-point{
  border-top:1px solid var(--t-line);
  color:var(--t-text);
  font-size:1.02rem;
  line-height:1.55;
  margin:1.15rem 0 0;
  max-width:26rem;
  /* space reserved up front so revealing it cannot shift the headline */
  min-height:4.8em;
  padding-top:1.05rem;
  transition:opacity .45s ease .1s;
}
.slide-point strong{color:var(--t-time);font-weight:700}
.slide-point.is-hidden{opacity:0}

/* secondary control — sits with the readout it replays, not under it */
.ghost-btn{
  background:transparent;
  border:1px solid var(--t-line);
  color:var(--t-dim);
  cursor:pointer;
  font:inherit;
  font-size:.72rem;
  font-weight:800;
  letter-spacing:.06em;
  margin-left:auto;
  padding:.25rem .6rem;
  text-transform:uppercase;
  transition:border-color .15s,color .15s;
}
.ghost-btn:hover{border-color:var(--t-light);color:var(--t-light)}
/* the armed second beat, so the eye knows there is more to come */
.ghost-btn.is-cue{border-color:var(--t-mass);color:var(--t-mass)}
.ghost-btn:disabled{cursor:default;opacity:.4}

.slide-link{
  color:var(--t-time);
  display:inline-block;
  font-size:.88rem;
  font-weight:700;
  margin-top:1.25rem;
  text-decoration:none;
  text-underline-offset:.2em;
}
.slide-link:hover{text-decoration:underline}

/* Cover slide */
.slide--cover .slide-copy h2{
  font-size:clamp(2.8rem,5.5vw,5rem);
  max-width:13ch;
}
.slide--cover .slide-hint{font-size:1.05rem}

/* ── Right: the plate ───────────────────────
   Not a window. The figure is presented as a measurement on its own
   ground, captioned underneath the way a plate is. Nothing here has a
   fixed height, so no step can ever scroll inside itself.          */
.plate{display:flex;flex-direction:column;margin:0;min-width:0}

.plate-field{
  background:var(--t-field);
  border-top:2px solid var(--t-rule);
  padding:1.1rem 1.15rem 1.2rem;
}

/* ── Shared plate bits ──────────────────── */
.plabel b{color:var(--t-time)}
.plabel{
  color:var(--t-dim);
  font-size:.74rem;
  font-weight:800;
  letter-spacing:.08em;
  margin:0 0 .7rem;
  text-transform:uppercase;
}

.plate p:not([class]){color:inherit}

.inline-btn{
  background:transparent;
  border:1px solid var(--t-rule);
  color:var(--t-text);
  cursor:pointer;
  font:inherit;
  font-weight:800;
  min-height:2.2rem;
  padding:.45rem .85rem;
}
.inline-btn:hover{background:var(--t-light-soft)}
.inline-btn:disabled{cursor:default;opacity:.45}
/* the button that starts the light moving takes the light color */
.inline-btn--go{border-color:var(--t-light);color:var(--t-light)}
.inline-btn--go:hover{background:var(--t-light-soft)}

.btn-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.75rem}

.feedback{
  background:var(--t-time-soft);
  border:1px solid var(--t-line);
  color:var(--t-text);
  font-size:.93rem;
  line-height:1.55;
  margin-top:.75rem;
  padding:.75rem;
}
.feedback.is-warn{background:var(--t-warn-soft)}
.feedback.is-good{background:var(--t-mass-soft)}
.feedback p{color:inherit;margin:0}
.feedback p + p{margin-top:.45rem}
.feedback strong{color:var(--t-text)}
.feedback.is-hidden{display:none}

.stat-strip{
  border-top:1px solid var(--t-line);
  display:grid;
  gap:.5rem;
  grid-template-columns:repeat(3,1fr);
  margin-top:.85rem;
  padding-top:.8rem;
}
.stat-cell{background:var(--t-card);border:1px solid var(--t-line);padding:.6rem .7rem}
.stat-cell b{
  color:var(--t-text);
  display:block;
  font-family:var(--font-display);
  font-size:1.15rem;
  font-variant-numeric:tabular-nums;
  line-height:1.1;
}
.stat-cell small{color:var(--t-dim);display:block;font-size:.76rem;margin-top:.25rem}

/* ── 00 The route ────────────────────────── */
/* vertical, because that is the direction the reader actually travels */
.route{
  border-left:1px solid var(--t-line);
  display:grid;
  gap:2rem;
  list-style:none;
  margin:0;
  padding:.5rem 0 .5rem 1.7rem;
}
.route-step{position:relative}
.route-step::before{
  background:var(--t-field);
  border:2px solid var(--t-time);
  border-radius:50%;
  content:"";
  height:.75rem;
  left:-1.98rem;
  position:absolute;
  top:.5rem;
  width:.75rem;
}
.route-step b{
  color:var(--t-text);
  display:block;
  font-family:var(--font-display);
  font-size:1.5rem;
  line-height:1.2;
}

/* ── 01 Race ─────────────────────────────── */
.race{display:grid;gap:.6rem}
.race-lane{background:var(--t-card);border:1px solid var(--t-line);padding:.7rem .85rem}
.race-lane__head{
  align-items:baseline;
  display:flex;
  justify-content:space-between;
  margin-bottom:.6rem;
}
.race-lane__head b{font-size:.95rem}
.race-lane__head span{
  color:var(--t-dim);
  font-size:.85rem;
  font-variant-numeric:tabular-nums;
}
.race-track{
  background:var(--t-trough);
  height:1.6rem;
  overflow:hidden;
  position:relative;
}
.race-track::after{
  background:repeating-linear-gradient(90deg,transparent 0 calc(10% - 1px),var(--t-line) calc(10% - 1px) 10%);
  content:"";
  inset:0;
  position:absolute;
}
.race-fill{
  height:100%;
  transform:scaleX(0);
  transform-origin:left;
  width:100%;
}
/* light against the fastest thing we ever built: gold against matter */
.race-fill--light{background:var(--t-light)}
.race-fill--voy{background:var(--t-mass)}
.race-marker{
  border-radius:50%;
  height:.7rem;
  left:0;
  position:absolute;
  top:50%;
  transform:translate(-50%,-50%);
  width:.7rem;
  z-index:2;
}
.race-marker--light{background:var(--t-field);box-shadow:0 0 0 3px var(--t-light)}
.race-marker--voy{background:var(--t-field);box-shadow:0 0 0 3px var(--t-mass)}
.race-finish{
  color:var(--t-dim);
  font-size:.74rem;
  font-weight:800;
  letter-spacing:.05em;
  margin-top:.35rem;
  text-align:right;
  text-transform:uppercase;
}

/* ── 02 Signal ───────────────────────────── */
.dest-row{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.9rem}
.dest-btn{
  background:transparent;
  border:1px solid var(--t-line);
  color:var(--t-dim);
  cursor:pointer;
  font:inherit;
  font-size:.85rem;
  padding:.42rem .7rem;
  transition:background .15s,border-color .15s,color .15s;
}
.dest-btn:hover{background:var(--t-light-soft);color:var(--t-text)}
.dest-btn.is-on{border-color:var(--t-light);color:var(--t-light)}

.signal-stage{padding:.35rem 0 0}
.signal-line{
  background:var(--t-line);
  height:1px;
  /* inset so the endpoint labels have room and are not clipped */
  margin:2.4rem 3.6rem 1rem;
  position:relative;
}
/* the light itself — the only thing on the figure that moves */
.signal-pulse{
  background:var(--t-light);
  border-radius:50%;
  box-shadow:0 0 0 4px var(--t-light-soft),0 0 20px var(--t-light-soft);
  height:.6rem;
  left:0;
  opacity:0;
  position:absolute;
  top:50%;
  transform:translate(-50%,-50%);
  width:.6rem;
}
.signal-node{
  position:absolute;
  text-align:center;
  top:50%;
  transform:translate(-50%,-50%);
  width:7rem;
}
.signal-node--a{left:0}
.signal-node--b{left:100%}
.signal-node i{
  background:var(--t-observer);
  border-radius:50%;
  box-shadow:0 0 0 4px var(--t-line);
  display:block;
  height:.7rem;
  margin:0 auto;
  width:.7rem;
}
/* the far end is a source of light, so it reads gold */
.signal-node--b i{
  background:var(--t-light);
  box-shadow:0 0 0 4px var(--t-light-soft),0 0 14px var(--t-light-soft);
}
.signal-node span{
  color:var(--t-dim);
  display:block;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.25;
  margin-top:.45rem;
}
.signal-readout{
  align-items:baseline;
  display:flex;
  gap:.6rem;
  margin-top:1.1rem;
}
/* the readout is an elapsed time, so it takes the time color */
.signal-readout b{
  color:var(--t-time);
  font-family:var(--font-display);
  font-size:clamp(1.6rem,3vw,2.3rem);
  font-variant-numeric:tabular-nums;
  line-height:1;
}
.signal-readout small{color:var(--t-dim);font-size:.85rem}
.signal-status{
  color:var(--t-dim);
  font-size:.85rem;
  line-height:1.5;
  margin-top:.6rem;
  /* reserved for the longest arrival line, so nothing shifts when it lands */
  min-height:2.9em;
  transition:color .3s ease;
}
.signal-status.is-note{color:var(--t-text)}

/* ── 03 Routes ───────────────────────────── */
.route-svg{
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:block;
  /* figures shrink on short screens so a step never spills */
  max-height:min(11.5rem,24vh);
  width:100%;
}
.route-path{fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:3}
.route-path--home{stroke:var(--t-observer)}
.route-path--trip{stroke:var(--t-mass);stroke-dasharray:4 5}
.route-dot{r:7}
.route-dot--home{fill:var(--t-observer)}
.route-dot--trip{fill:var(--t-mass)}
.route-cap{fill:var(--t-dim);font-family:var(--font-body);font-size:12px}

.tally{display:grid;gap:.5rem;grid-template-columns:1fr 1fr;margin-top:.75rem}
.tally-card{background:var(--t-card);border:1px solid var(--t-line);padding:.7rem .8rem}
.tally-card small{
  color:var(--t-dim);
  display:block;
  font-size:.74rem;
  font-weight:800;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.tally-card b{
  display:block;
  font-family:var(--font-display);
  font-size:1.9rem;
  font-variant-numeric:tabular-nums;
  line-height:1.15;
  margin-top:.25rem;
}
.tally-card--home b{color:var(--t-observer)}
.tally-card--trip b{color:var(--t-mass)}
.tally-card em{
  color:var(--t-dim);
  display:block;
  font-size:.78rem;
  font-style:normal;
  margin-top:.1rem;
}

/* ── 04 GPS ──────────────────────────────── */
.toggle-row.is-cue{border-color:var(--t-mass)}
.toggle-row{
  align-items:center;
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:flex;
  gap:.8rem;
  justify-content:space-between;
  margin:0 0 .85rem;
  padding:.7rem .85rem;
}
.toggle-row span{font-size:.9rem;font-weight:600}
.switch{
  background:var(--t-mass);
  border:none;
  border-radius:999px;
  cursor:pointer;
  flex-shrink:0;
  height:1.6rem;
  padding:0;
  position:relative;
  transition:background .2s ease;
  width:3rem;
}
.switch::after{
  background:var(--t-field);
  border-radius:50%;
  content:"";
  height:1.2rem;
  left:.2rem;
  position:absolute;
  top:.2rem;
  transition:transform .2s ease;
  width:1.2rem;
}
.switch[aria-checked="false"]{background:var(--t-trough)}
.switch[aria-checked="false"]::after{transform:translateX(1.4rem)}

.gps-stage{
  background:var(--t-card);
  border:1px solid var(--t-line);
  height:min(12rem,25vh);
  overflow:hidden;
  position:relative;
}
.gps-grid{
  background-image:linear-gradient(var(--t-line) 1px,transparent 1px),linear-gradient(90deg,var(--t-line) 1px,transparent 1px);
  background-size:2rem 2rem;
  inset:0;
  position:absolute;
}
.gps-truth,.gps-guess{
  border-radius:50%;
  left:50%;
  position:absolute;
  top:50%;
  transform:translate(-50%,-50%);
}
.gps-truth{
  background:var(--t-mass);
  box-shadow:0 0 0 5px var(--t-mass-soft);
  height:.85rem;
  width:.85rem;
}
/* the estimate is a ring, not a disc: corrected, it sits exactly on the
   true position, and a filled dot would paint the green one out */
.gps-guess{
  background:transparent;
  border:2px solid var(--t-warn);
  box-shadow:0 0 0 4px var(--t-warn-soft);
  height:1.55rem;
  transition:transform .35s ease;
  width:1.55rem;
}
.gps-readout{bottom:.45rem;position:absolute;right:.7rem;text-align:right}
.gps-readout b{
  color:var(--t-warn);
  display:block;
  font-family:var(--font-display);
  font-size:1.5rem;
  font-variant-numeric:tabular-nums;
  font-weight:700;
  line-height:1.1;
}
.gps-readout small{color:var(--t-dim);font-size:.74rem}

/* two effects pulling opposite ways, and the number that survives */
.drift-sum{align-items:center;display:flex;gap:.6rem;margin-top:.5rem}
.drift-term{
  background:var(--t-card);
  border:1px solid var(--t-line);
  flex:1;
  padding:.6rem .7rem;
}
.drift-term b{
  display:block;
  font-family:var(--font-display);
  font-size:1.25rem;
  font-variant-numeric:tabular-nums;
  line-height:1.1;
}
.drift-term small{color:var(--t-dim);display:block;font-size:.74rem;line-height:1.35;margin-top:.25rem}
.drift-term--total{border-color:var(--t-warn)}
.drift-term--total b{color:var(--t-warn)}
.drift-op{color:var(--t-dim);font-family:var(--font-display);font-size:1.15rem}

/* ── 04 The inversion ────────────────────── */
.path-svg{
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:block;
  max-height:min(9.5rem,19vh);
  width:100%;
}
.pathline{
  fill:none;
  stroke:var(--t-dim);
  stroke-linecap:round;
  stroke-linejoin:round;
  stroke-width:2.5;
  transition:stroke .35s ease,stroke-width .35s ease;
}
/* the winner is the flat one — that is the whole point of the step */
.pathline.is-most{stroke:var(--t-time);stroke-width:5}
.pathdot{fill:var(--t-observer)}

.result-block.is-hidden{display:none}
.ptally-head{align-items:baseline;display:flex;gap:.75rem;margin-top:.85rem}
.ptally-head .plabel{margin:0}
.paths-tally{display:grid;gap:.5rem;grid-template-columns:repeat(3,1fr);margin-top:.5rem}
.ptally{
  background:var(--t-card);
  border:1px solid var(--t-line);
  padding:.6rem .7rem;
  transition:border-color .35s ease;
}
.ptally.is-most{border-color:var(--t-time)}
.ptally small{
  color:var(--t-dim);
  display:block;
  font-size:.72rem;
  font-weight:800;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.ptally b{
  display:block;
  font-family:var(--font-display);
  font-size:1.55rem;
  font-variant-numeric:tabular-nums;
  line-height:1.15;
  margin-top:.2rem;
}
.ptally.is-most b{color:var(--t-time)}
.ptally em{color:var(--t-dim);display:block;font-size:.76rem;font-style:normal}

/* ── 05 Walkers ──────────────────────────── */
.globe-svg{background:var(--t-card);border:1px solid var(--t-line);display:block;max-height:min(13rem,27vh);width:100%}
.globe-outline{fill:var(--t-trough);stroke:var(--t-line);stroke-width:2}
.globe-lat{fill:none;stroke:var(--t-line);stroke-width:1.5}
.globe-eq{opacity:.6;stroke:var(--t-dim);stroke-width:1.5}
/* the two little arrows are the whole argument: same direction at the start */
.walk-north{fill:none;stroke:var(--t-dim);stroke-linecap:round;stroke-width:1.6}
/* and this is what closes without either of them turning */
.walk-gap{stroke:var(--t-dim);stroke-dasharray:3 4;stroke-width:1.5}
.walk-path{fill:none;stroke-linecap:round;stroke-width:3}
.walk-path--a{stroke:var(--t-observer)}
.walk-path--b{stroke:var(--t-mass)}
.walk-dot--a{fill:var(--t-observer)}
.walk-dot--b{fill:var(--t-mass)}

.ask{
  background:var(--t-card);
  border:1px solid var(--t-line);
  margin-top:.75rem;
  padding:.8rem;
}
.ask p{font-size:.92rem;font-weight:600;margin:0 0 .6rem}
.ask.is-answered{padding:.65rem}
/* the question stays legible after answering — the marked buttons mean
   nothing without it — but steps back so the reveal leads */
.ask.is-answered p{font-size:.82rem;font-weight:400;margin-bottom:.45rem;opacity:.75}
.ask-opts{display:flex;gap:.5rem}
.ask-btn{
  background:transparent;
  border:1px solid var(--t-line);
  color:var(--t-text);
  cursor:pointer;
  flex:1;
  font:inherit;
  font-size:.9rem;
  padding:.5rem;
  transition:background .15s,border-color .15s,color .15s;
}
.ask-btn:hover{background:var(--t-light-soft)}
.ask-btn.is-right{background:var(--t-mass-soft);border-color:var(--t-mass);color:var(--t-text);font-weight:700}
.ask-btn.is-wrong{background:var(--t-warn-soft);border-color:var(--t-warn);color:var(--t-text)}

/* ── 06 Falling time ─────────────────────── */
.height-stage{
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:grid;
  gap:0;
  grid-template-columns:1fr 1fr;
}
.height-cell{padding:.85rem}
.height-cell + .height-cell{border-left:1px solid var(--t-line)}
.height-cell small{
  color:var(--t-dim);
  display:block;
  font-size:.74rem;
  font-weight:800;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.tick-count{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,3vw,2.1rem);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  line-height:1.2;
  margin-top:.3rem;
}
.height-cell--high .tick-count{color:var(--t-time)}
.height-cell--low .tick-count{color:var(--t-mass)}
.height-cell em{
  color:var(--t-dim);
  display:block;
  font-size:.78rem;
  font-style:normal;
  margin-top:.2rem;
}
.fall-svg{
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:block;
  max-height:min(11rem,22vh);
  width:100%;
}
.fall-svg.is-live{border-color:var(--t-mass)}
.fall-axis{stroke:var(--t-line);stroke-width:1.5}
/* each bar is how fast time runs at that height — the tilt is the point */
.rate-bars line{opacity:.75;stroke:var(--t-time);stroke-linecap:round;stroke-width:3}
.rate-slope{fill:none;opacity:.9;stroke:var(--t-time);stroke-dasharray:4 4;stroke-width:1.5}
/* and this is a thing that falls, purely by following the tilt */
.fall-trail{stroke:var(--t-mass);stroke-dasharray:3 3;stroke-width:2}
.fall-dot{fill:var(--t-mass)}
.fall-cap{fill:var(--t-mass);font-family:var(--font-body);font-size:11px;font-weight:700}

.gap-bar{
  align-items:center;
  background:var(--t-trough);
  border:1px solid var(--t-line);
  display:flex;
  gap:.75rem;
  border-top:none;
  font-size:.85rem;
  padding:.6rem .85rem;
}
.gap-bar b{color:var(--t-mass);font-variant-numeric:tabular-nums}

/* ── 08 Waves ────────────────────────────── */
.wave-svg{
  background:var(--t-card);
  border:1px solid var(--t-line);
  display:block;
  max-height:min(11.5rem,24vh);
  width:100%;
}
.arm{stroke:var(--t-dim);stroke-linecap:round;stroke-width:2.5}
.arm-corner{fill:var(--t-dim)}
.arm-mirror{fill:var(--t-observer);stroke:var(--t-time);stroke-width:2}
.wave-note{
  fill:var(--t-time);
  font-family:var(--font-body);
  font-size:11px;
  font-weight:700;
  transition:opacity .3s ease;
}

/* ── 08 Summary ──────────────────────────── */
.sum-flow{display:grid;gap:.6rem}
.sum-box{background:var(--t-card);border:1px solid var(--t-line);padding:.85rem}
.sum-box strong{
  display:block;
  font-family:var(--font-display);
  font-size:1.2rem;
  line-height:1.2;
  margin-bottom:.3rem;
}
.sum-box span{color:var(--t-dim);font-size:.88rem;line-height:1.5}
.sum-quote{
  border-top:1px solid var(--t-line);
  color:var(--t-text);
  font-family:var(--font-display);
  font-size:1.2rem;
  line-height:1.45;
  margin:.35rem 0 0;
  padding-top:.9rem;
}

/* ── Cover scene ─────────────────────────── */
.cover-scene{
  background:var(--t-field);
  /* the floating header takes the top of the cover, so leave it room */
  height:min(calc(100vh - var(--header-h) - 11rem),40rem);
  overflow:hidden;
}
.cover-scene img{display:block;height:100%;object-fit:cover;width:100%}
html[data-theme="dark"] .cover-scene img{filter:brightness(.72) saturate(.82)}

/* ── Responsive ────────────────────────── */
@media(max-width:64rem){
  .snap-wrap{height:auto;overflow:visible;scroll-snap-type:none}
  .slide{grid-template-columns:1fr;height:auto;min-height:100svh;padding-bottom:3rem;padding-top:2.5rem}
  .slide--cover{padding-top:6.5rem}
  /* one column now, so the conclusion has to land after the figure it
     concludes rather than above it — unwrap the copy and reorder */
  .slide-copy{display:contents}
  .plate{order:2}
  .slide-point{min-height:0;order:3}
  .cover-scene{aspect-ratio:16 / 9;height:auto;min-height:0}
  .step-dots-wrap{display:none}
  .stat-strip{grid-template-columns:1fr}
}

@media(max-width:42rem){
  .slide-copy h2{font-size:1.65rem}
  .tally,.height-stage{grid-template-columns:1fr}
  .height-cell + .height-cell{border-left:none;border-top:1px solid var(--t-line)}
  /* keep the label overhang just inside the shorter line */
  .signal-line{margin-left:2.8rem;margin-right:2.8rem}
  .signal-node{width:5.4rem}
  .signal-node span{font-size:.68rem}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}