/* Scr4tch project page
   Two semantic accents run through the page:
   --camera (blue)  = camera / static content
   --motion (ember) = scene motion / dynamics, time */

:root {
  color-scheme: light dark;
  --paper: #F4F5F7;
  --plate: #FFFFFF;
  --ink: #191A3A;
  --ink-2: #4A4E6C;
  --ink-3: #6E7290;
  --rule: #D8DBE4;
  --hatch: #DFE2EA;
  --camera: #2B5BE0;
  --camera-soft: #9DB4F2;
  --motion: #E8551C;
  --heading: #676EF6;
  --on-camera: #FFFFFF;
  --on-motion: #191A3A;
  --mark: #868B9F;
  --ghost-1: rgb(232 85 28 / .32);
  --ghost-2: rgb(232 85 28 / .14);
  --ours-row: rgb(43 91 224 / .07);
  --font: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14152B;
    --plate: #1C1E38;
    --ink: #E7E8F3;
    --ink-2: #B9BCD0;
    --ink-3: #8E92AB;
    --rule: #2E3150;
    --hatch: #272A48;
    --camera: #5A7FF0;
    --camera-soft: #3A4E8E;
    --motion: #EA602A;
    --heading: #868CF8;
    --on-camera: #14152B;
    --on-motion: #14152B;
    --mark: #7C8197;
    --ghost-1: rgb(234 96 42 / .34);
    --ghost-2: rgb(234 96 42 / .15);
    --ours-row: rgb(90 127 240 / .12);
  }
}

/* ------------------------------------------------------------ base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--camera); text-decoration-thickness: 1px; text-underline-offset: .18em; }
:focus-visible { outline: 2px solid var(--camera); outline-offset: 2px; border-radius: 4px; }
sup { font-size: .68em; line-height: 0; }
figure { margin: 0; }
figcaption { font-size: 14px; line-height: 1.4; color: var(--ink-2); margin-top: 6px; }
b, strong { font-weight: 700; }

.page { width: min(100% - 32px, 1200px); margin-inline: auto; }
@media (min-width: 720px) { .page { width: min(100% - 64px, 1200px); } }

.skip { position: absolute; left: 16px; top: -48px; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: 6px; z-index: 10; }
.skip:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--ink-3); font-weight: 400; }

/* ------------------------------------------------------------ hero */
.hero { padding-top: clamp(48px, 9vw, 112px); padding-bottom: 36px; }

.wordmark {
  margin: 0 0 22px -0.045em;
  font-size: clamp(58px, 15vw, 184px);
  font-weight: 820;
  font-stretch: 125%;
  line-height: .86;
  letter-spacing: -0.035em;
}
/* The "4" is the moving part of the name: outlined onion-skin copies mark earlier positions. */
.wordmark .four {
  position: relative;
  display: inline-block;
  isolation: isolate;
  color: var(--motion);
  animation: four-arrive 1000ms cubic-bezier(.2, .75, .25, 1) 120ms both;
}
.wordmark .four::before,
.wordmark .four::after {
  content: "4";
  position: absolute; left: 0; top: 0; z-index: -1;
  color: transparent;
  -webkit-text-stroke: max(1.5px, .011em) var(--motion);
  pointer-events: none;
  animation: ghost-in 700ms ease-out 700ms both;
}
.wordmark .four::before { transform: translateY(-.17em); --ghost: .55; }
.wordmark .four::after  { transform: translateY(-.34em); --ghost: .25; }
.wordmark .four::before, .wordmark .four::after { opacity: var(--ghost); }
@keyframes four-arrive {
  0%   { transform: translateY(-.4em); opacity: 0; }
  30%  { opacity: 1; }
  100% { transform: none; }
}
@keyframes ghost-in {
  from { opacity: 0; }
  to   { opacity: var(--ghost); }
}

.paper-title {
  margin: 0 0 30px;
  max-width: 30ch;
  font-size: clamp(22px, 2.7vw, 31px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.005em;
}
.authors, .affiliations { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; }
.authors { gap: 4px 20px; font-size: 18px; font-weight: 560; }
.authors sup, .affiliations sup { color: var(--ink-3); font-weight: 500; margin-left: 1px; }
.affiliations { gap: 2px 18px; margin-top: 8px; font-size: 15px; color: var(--ink-2); }
.notes { margin: 6px 0 0; font-size: 14px; color: var(--ink-3); }

.links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }

/* ------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 42px; padding: 0 16px;
  border: 1px solid var(--ink); border-radius: 6px;
  background: transparent; color: var(--ink);
  font: inherit; font-size: 16px; font-weight: 620; font-stretch: 104%;
  text-decoration: none; cursor: pointer;
  transition: background-color .15s, color .15s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--camera); border-color: var(--camera); color: var(--on-camera); }
.btn--small { height: 34px; padding: 0 12px; font-size: 14.5px; }
.btn[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.btn[aria-disabled="true"] {
  border-style: dashed; border-color: var(--ink-3); color: var(--ink-3);
  background: transparent; pointer-events: none;
}
.soon { font-size: 12px; font-weight: 520; padding: 1px 7px; border-radius: 999px; background: var(--hatch); color: var(--ink-2); }

/* ------------------------------------------------------------ teaser + tl;dr */
/* Chrome and Edge on Windows show videos on a hardware overlay plane through a hole punched in
   the page. At fractional sizes the hole and the overlay round differently, and a 1px strip of
   whatever is behind the browser window shows on the right and bottom (screenshots miss it).
   The near-identity filter keeps the video in normal compositing. */
.teaser { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; margin-top: 4px; border-radius: 8px; filter: saturate(1.001); }

.tldr {
  display: grid; gap: 28px 56px;
  margin: 40px 0 8px;
}
@media (min-width: 860px) { .tldr { grid-template-columns: minmax(0, 1fr) auto; align-items: start; } }
.tldr__text { margin: 0; max-width: 34ch; font-size: clamp(21px, 2.3vw, 27px); line-height: 1.35; font-weight: 500; }
.without p { margin: 0 0 6px; font-size: 14.5px; color: var(--ink-3); }
.without ul { list-style: none; margin: 0; padding: 0; }
.without li { font-size: 19px; font-weight: 600; line-height: 1.5; color: var(--ink-2); }
.without s { text-decoration-color: var(--motion); text-decoration-thickness: 2px; }

/* ------------------------------------------------------------ layout + rail */
.layout { display: grid; grid-template-columns: minmax(0, 1fr); margin-top: 32px; }
.rail { display: none; }
@media (min-width: 1100px) {
  .layout { grid-template-columns: 160px minmax(0, 1fr); column-gap: 56px; }
  .rail { display: block; position: sticky; top: 24px; align-self: start; padding-top: 66px; }
}
.rail ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.rail a {
  display: block; margin-left: -1px; padding: 5px 0 5px 14px;
  border-left: 2px solid transparent;
  color: var(--ink-3); font-size: 14.5px; font-weight: 520; text-decoration: none;
}
.rail a:hover { color: var(--ink); }
.rail a[aria-current="true"] { color: var(--ink); border-left-color: var(--ink); }

/* ------------------------------------------------------------ sections + type */
.section { padding: 60px 0 8px; border-top: 1px solid var(--rule); scroll-margin-top: 8px; }
main { min-width: 0; }
h2 {
  margin: 0 0 18px; max-width: 24ch;
  font-size: clamp(28px, 3.4vw, 38px); line-height: 1.12;
  font-weight: 760; font-stretch: 112%; letter-spacing: -0.012em;
  color: var(--heading);   /* colored so section starts stand out from the h3 subheads */
}
h3 { margin: 52px 0 14px; font-size: 20px; line-height: 1.3; font-weight: 680; font-stretch: 106%; }
.lede { margin: 0 0 28px; max-width: 62ch; font-size: 19px; line-height: 1.5; }
.prose { max-width: 68ch; }
.prose p, p.prose { margin: 0 0 14px; }
.caption { margin: 12px 0 0; max-width: 80ch; font-size: 14.5px; line-height: 1.5; color: var(--ink-2); }
.subhead { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 12px 24px; margin-top: 52px; }
.subhead h3 { margin: 0; }

.grid-3 { display: grid; gap: 16px; }
@media (min-width: 720px) { .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.plate { background: #FFFFFF; border-radius: 8px; padding: 12px; }

/* ------------------------------------------------------------ media slots (placeholders) */
.slot {
  position: relative; overflow: hidden;
  display: grid; place-items: center;
  aspect-ratio: var(--ratio, 16 / 9);
  padding: clamp(12px, 3vw, 32px);
  border: 1px dashed var(--ink-3); border-radius: 8px;
  background: repeating-linear-gradient(135deg, var(--hatch) 0 1px, transparent 1px 11px), var(--plate);
}
.slot + .slot, .caption + .slot, .slot + .fold { margin-top: 20px; }
.grid-3 > .slot { margin-top: 0; }
.slot__todo { display: grid; gap: 6px; max-width: 48ch; padding: 14px 16px; border-radius: 6px; background: var(--plate); }
.slot__todo strong { font-size: 16.5px; font-weight: 680; font-stretch: 106%; }
.slot__todo span { font-size: 14.5px; line-height: 1.45; color: var(--ink-2); }
.slot__todo code { font-family: var(--mono); font-size: 12.5px; color: var(--ink-3); word-break: break-all; }
.slot.is-loaded { padding: 0; border: 0; background: transparent; }
.slot.is-loaded > video, .slot.is-loaded > img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 719px) {
  .grid-3 .slot { aspect-ratio: auto; min-height: 220px; }
  .slot[style*="21 / 9"], .slot[style*="32 / 9"] { aspect-ratio: 4 / 3; }
}

/* ------------------------------------------------------------ segmented controls, ranges */
.seg { display: inline-flex; flex-wrap: wrap; gap: 2px; padding: 3px; border: 1px solid var(--rule); border-radius: 8px; background: var(--plate); }
.seg[hidden] { display: none; }
.seg button {
  padding: 6px 12px; border: 0; border-radius: 6px;
  background: transparent; color: var(--ink-2);
  font: inherit; font-size: 14.5px; font-weight: 600; cursor: pointer;
}
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.seg button:disabled { opacity: .4; cursor: not-allowed; text-decoration: line-through; }

.control { display: grid; gap: 6px; justify-items: start; }
.control__label { font-size: 14px; font-weight: 520; color: var(--ink-2); }

.range { display: grid; gap: 2px; flex: 1 1 220px; font-size: 14.5px; color: var(--ink-2); }
.range > span { display: flex; justify-content: space-between; gap: 8px; }
.range output { color: var(--ink); font-weight: 650; font-variant-numeric: tabular-nums; }
.range input { width: 100%; height: 28px; margin: 0; accent-color: var(--ink); cursor: pointer; }
.range--camera input { accent-color: var(--camera); }
.range--time input { accent-color: var(--motion); }

/* ------------------------------------------------------------ camera x time explorer */
.tv { margin-top: 20px; }
.tv__scenes { margin-bottom: 16px; }
.tv__stage {
  display: grid; gap: 20px; align-items: start;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 860px) { .tv__stage { grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(220px, 290px); } }
.tv__frame {
  aspect-ratio: 1; border-radius: 6px;
  background-color: var(--hatch); background-repeat: no-repeat;
  background-size: calc(var(--cols, 7) * 100%) calc(var(--rows, 7) * 100%);
}
.tv__view figcaption { font-size: 15px; color: var(--ink); margin-top: 8px; }

.tv__padwrap { position: relative; padding: 26px 0 0 26px; grid-column: 1 / -1; max-width: 340px; }
@media (min-width: 860px) { .tv__padwrap { grid-column: auto; max-width: none; } }
.axis { position: absolute; display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 650; color: var(--ink-2); }
.axis--x { top: 0; left: 26px; right: 0; height: 20px; }
.axis--y { left: 0; top: 26px; bottom: 0; width: 20px; writing-mode: vertical-rl; }
.axis::after { content: ""; flex: 1; }
.axis--x::after {
  height: 10px; background: var(--camera);
  clip-path: polygon(0 4px, calc(100% - 9px) 4px, calc(100% - 9px) 0, 100% 5px, calc(100% - 9px) 10px, calc(100% - 9px) 6px, 0 6px);
}
.axis--y::after {
  width: 10px; background: var(--motion);
  clip-path: polygon(4px 0, 6px 0, 6px calc(100% - 9px), 10px calc(100% - 9px), 5px 100%, 0 calc(100% - 9px), 4px calc(100% - 9px));
}
.tv__pad {
  position: relative; aspect-ratio: 1; border-radius: 6px; overflow: hidden;
  background-size: 100% 100%; background-color: var(--hatch);
  cursor: crosshair; touch-action: none;
}
.tv__pad::before { content: ""; position: absolute; inset: 0; background: var(--paper); opacity: .55; }
.tv__band { position: absolute; pointer-events: none; transition: left .12s ease-out, top .12s ease-out; }
.tv__band--col { top: 0; bottom: 0; width: calc(100% / var(--cols, 7)); left: calc(var(--c, 0) * 100% / var(--cols, 7)); background: var(--camera); opacity: .16; }
.tv__band--row { left: 0; right: 0; height: calc(100% / var(--rows, 7)); top: calc(var(--r, 0) * 100% / var(--rows, 7)); background: var(--motion); opacity: .16; }
.tv__cursor {
  position: absolute; z-index: 2; pointer-events: none;
  width: calc(100% / var(--cols, 7)); height: calc(100% / var(--rows, 7));
  left: calc(var(--c, 0) * 100% / var(--cols, 7)); top: calc(var(--r, 0) * 100% / var(--rows, 7));
  background-size: calc(var(--cols, 7) * 100%) calc(var(--rows, 7) * 100%);
  background-position: calc(var(--c, 0) / (var(--cols, 7) - 1) * 100%) calc(var(--r, 0) / (var(--rows, 7) - 1) * 100%);
  outline: 2px solid var(--ink); box-shadow: 0 0 0 4px var(--paper);
  transition: left .12s ease-out, top .12s ease-out;
}
.tv__pad:focus-visible { outline-offset: 4px; }
.tv__controls { display: flex; flex-wrap: wrap; align-items: end; gap: 14px 24px; margin-top: 20px; }
.tv__sweeps { display: flex; gap: 8px; }

/* ------------------------------------------------------------ motion masks */
.masks { display: grid; gap: 18px 16px; margin-top: 16px; }
@media (min-width: 720px) { .masks { grid-template-columns: repeat(2, minmax(0, 1fr)); } .mask--4 { grid-column: 1 / -1; } }
.flip { position: relative; }
.flip img { width: 100%; border-radius: 4px; }
.flip img + img { position: absolute; inset: 0; height: 100%; opacity: 0; transition: opacity .3s ease; }
.masks.show-mask .flip img + img { opacity: 1; }
@media (hover: hover) {
  .masks:not(.show-mask) .flip:hover img + img { opacity: 1; }
  .masks.show-mask .flip:hover img + img { opacity: 0; }
}

/* ------------------------------------------------------------ camera trajectory viewer */
.pose__controls { display: flex; flex-wrap: wrap; gap: 14px 32px; margin: 4px 0 16px; }
.pose__stage { display: grid; gap: 16px; align-items: start; }
@media (min-width: 720px) { .pose__stage { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); } }
@media (max-width: 719px) { .pose__input { max-width: 260px; } }
.pose__input img { width: 100%; aspect-ratio: 1; border-radius: 6px; background: var(--hatch); }
.pose__input output { color: var(--ink); font-weight: 650; font-variant-numeric: tabular-nums; }
.pose__view { position: relative; aspect-ratio: 4 / 3; overflow: hidden; border-radius: 6px; background: var(--plate); }
@media (min-width: 720px) { .pose__view { aspect-ratio: 2 / 1; } }
.pose__view canvas { display: block; width: 100%; height: 100%; cursor: grab; touch-action: pan-y; }
.pose__view canvas.is-dragging { cursor: grabbing; }
.pose__view canvas:focus-visible { outline-offset: -2px; }
.pose__legend {
  position: absolute; left: 12px; top: 10px; display: grid; gap: 1px;
  margin: 0; padding: 0; list-style: none; pointer-events: none;
  font-size: 13.5px; color: var(--ink-2);
}
.pose__legend li { display: flex; align-items: center; gap: 8px; }
.pose__legend i { width: 20px; border-top: 2.5px solid var(--mark); }
.pose__legend .is-ours { color: var(--ink); font-weight: 680; }
.pose__legend .is-ours i { border-top-color: var(--camera); }
.pose__legend .is-ref i { border-top: 2px dashed var(--ink); }
.pose__hint { position: absolute; right: 12px; bottom: 8px; font-size: 12.5px; color: var(--ink-3); pointer-events: none; }
.pose__bar { display: flex; align-items: center; gap: 14px; margin-top: 14px; }
.pose__bar .btn { flex: none; min-width: 72px; justify-content: center; }
.pose__strip { flex: 1; display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 5px; max-width: 620px; }
.pose__strip button { padding: 0; border: 0; border-radius: 4px; background: none; cursor: pointer; opacity: .4; transition: opacity .15s; }
.pose__strip button.is-seen { opacity: .8; }
.pose__strip button[aria-current="true"] { opacity: 1; outline: 2px solid var(--ink); outline-offset: 2px; }
.pose__strip img { width: 100%; aspect-ratio: 1; border-radius: 4px; }

/* ------------------------------------------------------------ OOD */
.ood { display: grid; grid-template-columns: 1fr 1.25fr 1fr; gap: 16px; align-items: center; max-width: 760px; }
.ood img { width: 100%; border-radius: 6px; }
.ood__cams img { background: #FFFFFF; padding: 8px; }

/* ------------------------------------------------------------ tables */
.table-wrap { overflow-x: auto; margin-top: 16px; -webkit-overflow-scrolling: touch; }
.table-wrap[hidden] { display: none; }
.table { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
.table caption { caption-side: top; padding-bottom: 8px; text-align: left; font-size: 14.5px; color: var(--ink-2); }
.table th, .table td { padding: 8px 12px; border-bottom: 1px solid var(--rule); text-align: right; white-space: nowrap; }
.table th[scope="row"], .table thead th:first-child { text-align: left; font-weight: 500; }
.table thead th { vertical-align: bottom; border-bottom: 1px solid var(--ink-3); font-size: 13.5px; font-weight: 650; color: var(--ink-2); }
.table thead th[scope="colgroup"] { text-align: center; border-bottom: 1px solid var(--rule); }
.table tr.group th { padding-top: 18px; text-align: left; font-size: 13.5px; font-weight: 650; color: var(--ink-3); }
.table tr.is-ours > * { background: var(--ours-row); }
.table tr.is-ours th { font-weight: 700; }
.table strong { font-weight: 760; }
.table--text th, .table--text td { white-space: normal; text-align: left; vertical-align: top; line-height: 1.45; }
.table--text th[scope="row"] { width: 40%; font-weight: 650; }
.table--text .muted { font-size: 14px; }
.two-tables { display: grid; gap: 8px 32px; }
@media (min-width: 980px) { .two-tables { grid-template-columns: 1.25fr 1fr; } }

/* ------------------------------------------------------------ interpolation scrubber */
.interp { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; max-width: 720px; }
.sprite {
  aspect-ratio: 1; border-radius: 6px; background-repeat: no-repeat; background-color: var(--hatch);
  background-size: calc(var(--frames, 9) * 100%) 100%;
  background-position: calc(var(--i, 0) / (var(--frames, 9) - 1) * 100%) 0;
}
.interp figcaption { font-size: 15px; color: var(--ink); }
.interp__controls { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: end; gap: 12px 18px; }

/* ------------------------------------------------------------ leakage probe */
.probe { margin-top: 8px; }
.probe__controls { display: flex; flex-wrap: wrap; gap: 16px 32px; margin: 16px 0 18px; }
.probe__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (min-width: 720px) { .probe__row { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.probe__row img { width: 100%; border-radius: 6px; }
.probe__out img { outline: 2px solid var(--ink); outline-offset: 3px; }
.probe__out figcaption { color: var(--ink); }
.probe__out [data-probe-setting] { display: block; color: var(--ink-2); }
.probe__verdict { margin: 18px 0 0; max-width: 62ch; min-height: 3.2em; padding-left: 14px; border-left: 3px solid var(--verdict, var(--ink-3)); }
.probe__verdict[data-state="ok"] { --verdict: var(--camera); }
.probe__verdict[data-state="leak"] { --verdict: var(--motion); }
.probe__verdict b { font-weight: 720; }

/* ------------------------------------------------------------ method */
.tokens { display: grid; gap: 16px; margin: 8px 0 0; padding: 20px; border-radius: 10px; background: var(--plate); }
.tokens__row { display: grid; gap: 8px 18px; align-items: center; }
@media (min-width: 760px) { .tokens__row { grid-template-columns: 124px auto minmax(0, 1fr); } }
.tokens__name { font-size: 15px; font-weight: 650; }
.tokens__set { display: flex; gap: 4px; }
.tokens__note { font-size: 14.5px; line-height: 1.45; color: var(--ink-2); }
.tok {
  display: inline-block; min-width: 38px; height: 34px; padding: 0 6px;
  border-radius: 6px; text-align: center; line-height: 34px;
  font-style: normal; font-size: 14px; font-weight: 650; white-space: nowrap;
}
.tok sub { font-size: .7em; line-height: 0; }
.tok--cam { background: var(--camera); color: var(--on-camera); }
.tok--time { border: 2px solid var(--motion); color: var(--ink); line-height: 30px; }
.tok--mot { background: var(--motion); color: var(--on-motion); }
.tok--drop { background: transparent; border: 1.5px dashed var(--ink-3); color: var(--ink-3); line-height: 31px; }

.stages { list-style: none; display: grid; gap: 28px 40px; margin: 36px 0 32px; padding: 0; }
@media (min-width: 860px) { .stages { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.stages > li { padding-top: 14px; border-top: 2px solid var(--ink); }
.stages h3 { margin: 0 0 10px; }
.stages__n { display: block; margin-bottom: 2px; font-size: 14px; font-weight: 600; font-stretch: 100%; color: var(--ink-3); }
.stages ul { margin: 0; padding-left: 18px; }
.stages ul li { margin-bottom: 8px; font-size: 16px; line-height: 1.5; }
.stages ul li::marker { color: var(--ink-3); }

/* ------------------------------------------------------------ folds (details) */
.fold { margin-top: 24px; border-top: 1px solid var(--rule); }
.folds { border-bottom: 1px solid var(--rule); }
.folds:last-child { border-bottom: 0; }   /* the next section's top rule closes it */
.folds .fold { margin-top: 0; }
.fold summary {
  display: flex; align-items: center; gap: 12px; padding: 14px 0;
  font-size: 17px; font-weight: 650; list-style: none; cursor: pointer;
}
.fold summary::-webkit-details-marker { display: none; }
.fold summary::before {
  content: ""; width: 8px; height: 8px; margin: 0 2px 0 4px;
  border-right: 2px solid var(--ink-2); border-bottom: 2px solid var(--ink-2);
  transform: rotate(-45deg); transition: transform .15s;
}
.fold[open] summary::before { transform: rotate(45deg); }
.fold > :not(summary):last-child { margin-bottom: 24px; }
.fold > .seg { margin-bottom: 4px; }

/* ------------------------------------------------------------ labeled image grids */
.labeled { display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); margin-top: 20px; }
.labeled > span { align-self: end; padding: 0 4px 6px; text-align: center; font-size: 13.5px; line-height: 1.25; color: var(--ink-2); }
.labeled > img, .labeled > .rows { grid-column: 1 / -1; width: 100%; }
.labeled img { border-radius: 4px; }
.rows { position: relative; }
.row-tag {
  position: absolute; left: 6px; top: calc(var(--row) * 100% / var(--rows) + 6px);
  padding: 1px 6px; border-radius: 4px; background: rgb(255 255 255 / .9); color: #191A3A;
  font-size: 13px; font-style: normal; font-weight: 650;
}
@media (max-width: 719px) { .labeled > span { font-size: 11px; padding: 0 1px 4px; } }

/* ------------------------------------------------------------ novel view synthesis */
.nvs { display: grid; gap: 28px; align-items: start; }
@media (min-width: 860px) { .nvs { grid-template-columns: minmax(0, 420px) minmax(0, 1fr); } }
.compare {
  position: relative; aspect-ratio: 1; margin-top: 12px; overflow: hidden;
  border-radius: 6px; user-select: none; -webkit-user-select: none;
}
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; }
.compare__top { clip-path: inset(0 calc(100% - var(--pos)) 0 0); }
.compare__handle { position: absolute; top: 0; bottom: 0; left: var(--pos); width: 2px; margin-left: -1px; background: #FFFFFF; box-shadow: 0 0 0 1px rgb(0 0 0 / .2); pointer-events: none; }
.compare__handle::after {
  content: ""; position: absolute; top: 50%; left: 50%; width: 26px; height: 26px;
  border-radius: 50%; background: #FFFFFF; transform: translate(-50%, -50%);
  box-shadow: 0 1px 4px rgb(0 0 0 / .3);
}
.compare__tag { position: absolute; top: 8px; padding: 2px 8px; border-radius: 4px; background: rgb(255 255 255 / .92); color: #191A3A; font-size: 13px; font-weight: 650; pointer-events: none; }
.compare__tag--l { left: 8px; }
.compare__tag--r { right: 8px; }
.compare__range { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: ew-resize; }
.compare:has(.compare__range:focus-visible) { outline: 2px solid var(--camera); outline-offset: 3px; }
.nvs__rgb { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.nvs__rgb img { width: 100%; border-radius: 6px; }
.nvs__rgb figcaption { color: var(--ink); }
.nvs__ctx > div { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; }
@media (min-width: 860px) { .nvs__rgb { margin-top: 54px; } }

/* ------------------------------------------------------------ bar charts */
.bars { position: relative; max-width: 760px; margin-top: 20px; }
.bars__title { margin: 0 0 8px; font-size: 15.5px; font-weight: 650; }
.bars__group { margin: 14px 0 4px; font-size: 13.5px; font-weight: 600; color: var(--ink-3); }
.bar { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 12px; align-items: center; height: 30px; outline-offset: 0; }
.bars--mix .bar { grid-template-columns: 130px minmax(0, 1fr); }
.bar__name { text-align: right; font-size: 14.5px; color: var(--ink-2); }
.bar--ours .bar__name { color: var(--ink); font-weight: 700; }
.bar__track {
  position: relative; height: 100%;
  background: linear-gradient(to right, var(--rule) 1px, transparent 1px) 0 0 / 25% 100% repeat-x;
  border-right: 1px solid var(--rule);
}
.bar__fill {
  position: absolute; left: 0; top: 50%; height: 14px; width: calc(var(--v) * 100%);
  transform: translateY(-50%); border-radius: 0 4px 4px 0; background: var(--mark);
}
.bar--ours .bar__fill { background: var(--camera); }
.bar--accent .bar__fill { background: var(--motion); }
.bar:hover .bar__fill, .bar:focus-visible .bar__fill,
.bar:hover .bar__ext, .bar:focus-visible .bar__ext { filter: brightness(1.12); }
/* Stacked bar: the base result, then a lighter extension for the gain from test-time training. */
.bar--ttt .bar__fill { border-radius: 0; }
.bar__ext {
  position: absolute; top: 50%; height: 14px; transform: translateY(-50%);
  left: calc(var(--v) * 100%); width: calc((var(--v2) - var(--v)) * 100%);
  border-radius: 0 4px 4px 0; background: var(--camera-soft);
}
.bar__base {
  position: absolute; top: 50%; right: calc((1 - var(--v)) * 100% + 5px); transform: translateY(-50%);
  font-size: 11px; line-height: 1; font-weight: 650; font-variant-numeric: tabular-nums; color: var(--on-camera);
}
.bar--ttt .bar__val { left: calc(var(--v2) * 100% + 8px); }
.bars__legend { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0 0 4px; font-size: 13.5px; color: var(--ink-2); }
.bars__legend span { display: inline-flex; align-items: center; gap: 6px; }
.key { width: 14px; height: 10px; border-radius: 2px; }
.key--ours { background: var(--camera); }
.key--ttt { background: var(--camera-soft); }
.bar__val {
  position: absolute; top: 50%; left: calc(var(--v) * 100% + 8px); transform: translateY(-50%);
  font-size: 13.5px; font-weight: 620; font-variant-numeric: tabular-nums; color: var(--ink);
}
.bars__axis { position: relative; height: 22px; margin-left: 122px; font-size: 12.5px; font-variant-numeric: tabular-nums; color: var(--ink-3); }
.bars__axis span { position: absolute; top: 4px; left: calc(var(--t) * 100%); transform: translateX(-50%); }
.tip {
  position: absolute; z-index: 5; pointer-events: none; white-space: nowrap;
  padding: 6px 9px; border-radius: 6px; background: var(--ink); color: var(--paper); font-size: 13px;
}
@media (max-width: 559px) {
  .bar, .bars--mix .bar { grid-template-columns: 92px minmax(0, 1fr); gap: 8px; }
  .bar__name { font-size: 13px; }
  .bars__axis { margin-left: 100px; }
}

/* ------------------------------------------------------------ dataset */
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 8px 0 24px; border-top: 1px solid var(--rule); }
@media (min-width: 860px) { .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.facts > div { padding: 12px 16px 12px 0; }
.facts dt { font-size: 13.5px; color: var(--ink-3); }
.facts dd { margin: 2px 0 0; font-size: 16.5px; font-weight: 600; line-height: 1.35; }
.dataset img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 6px; }
.bars--mix { margin: 32px 0 24px; }

/* ------------------------------------------------------------ ablations, citation, footer */
.findings { padding-left: 20px; margin: 18px 0 0; }
.findings li { margin-bottom: 8px; }
.bib { position: relative; border-radius: 10px; background: var(--plate); }
.bib pre { margin: 0; padding: 20px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.55; }
.bib__copy { position: absolute; top: 12px; right: 12px; background: var(--plate); }
.footer { margin-top: 64px; padding: 28px 0 56px; border-top: 1px solid var(--rule); font-size: 13.5px; color: var(--ink-3); }
.footer p { max-width: 90ch; margin: 0; }

/* ------------------------------------------------------------ motion preferences */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}