/* ---------- 28 October, round 2 (review/site_options_2026-10-28/round2) ----------
   Parts that are things (the cast, timelines, diagrams, scoreboards) sit on a soft panel; prose stays on the page.
   html[data-shade] picks the panel: soft (default), grid (faint dot grid) or flat (rules only). */
:root {
  --panel: #f4f1e9;
  --panel-line: #e4ddcf;
  --loss: #b3402a;
  --win: #2d7f57;
  --part-bridge: #3299f4;
  --part-paint: #d973a6;
  --part-lift: #b78f37;
  --marker: #ffe36e;
}
.panel {
  background: var(--panel);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
}
[data-shade="grid"] .panel {
  background-image: radial-gradient(
    circle at 1px 1px,
    rgba(90, 70, 40, 0.16) 1px,
    transparent 1.4px
  );
  background-size: 14px 14px;
}
[data-shade="flat"] .panel {
  background: none;
  border-radius: 0;
  padding-inline: 0;
  border-block: 1px solid var(--border);
}
@media (max-width: 640px) {
  .panel {
    padding: 1rem;
  }
}
/* the display face draws old-style figures by default (P0 reads "Po"); everything here uses lining ones
/* (important: the font shorthands below would reset it) */
[class^="r2-"],
[class*=" r2-"],
[class^="r2-"] *,
[class*=" r2-"] * {
  font-variant-numeric: lining-nums !important;
}
.is-loss {
  color: var(--loss) !important;
}

/* the adapter's three parts keep one colour each, wherever they appear */
[data-part="bridge"] {
  --sw: var(--part-bridge);
}
[data-part="paint"] {
  --sw: var(--part-paint);
}
[data-part="lift"] {
  --sw: var(--part-lift);
}
.parts li[data-part] > b::before {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  border-radius: 2px;
  margin-right: 0.45em;
  vertical-align: 0.1em;
  background: var(--sw);
}

/* ---------- the timeline at the top ---------- */
.r2-film,
.r2-rail {
  list-style: none;
  padding: 0;
  margin: 2rem auto 0.75rem;
  max-width: 62rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.75rem;
  text-align: left;
}
.r2-film li,
.r2-rail li {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.r2-film figure {
  position: relative;
  margin: 0 0 0.75rem;
}
.r2-film img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  background: var(--border-subtle);
}
/* a chevron in each gap: read left to right */
.r2-film li + li figure::before {
  content: "";
  position: absolute;
  top: 50%;
  right: calc(100% + 0.6rem);
  width: 0.7rem;
  height: 0.7rem;
  border-top: 2px solid var(--text);
  border-right: 2px solid var(--text);
  transform: translateY(-50%) rotate(45deg);
}
.r2-film time,
.r2-rail time {
  font: 600 0.78rem/1.2 var(--font-sans);
  letter-spacing: 0.01em;
  color: var(--text-muted);
}
.r2-film li:last-child time,
.r2-rail li:last-child time {
  width: fit-content;
  padding: 0 0.3em;
  margin-left: -0.3em;
  border-radius: 3px;
  background: var(--marker);
  color: var(--text);
}
.r2-film li > b,
.r2-rail li > b {
  font: 600 1.35rem/1.15 var(--font-display);
  color: var(--text);
  margin: 0.15rem 0 0.3rem;
}
.r2-film li > span,
.r2-rail li > span {
  font-size: 1rem;
  line-height: 1.45;
  color: var(--text-body);
}
.r2-film span b,
.r2-rail span b {
  font-weight: 600;
  color: var(--text);
}
/* the dated line: a rail with a dot per step and an arrowhead at the end */
.r2-rail {
  position: relative;
}
.r2-rail li {
  position: relative;
  padding-top: 2.2rem;
}
.r2-rail time {
  position: absolute;
  top: 0;
  left: 0;
}
.r2-rail li::before {
  content: "";
  position: absolute;
  top: 1.45rem;
  left: 0;
  right: -1.75rem;
  border-top: 2px solid var(--text);
}
.r2-rail li:last-child::before {
  right: 0.3rem;
}
.r2-rail li::after {
  content: "";
  position: absolute;
  top: calc(1.45rem - 6px);
  left: 0;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 2px solid var(--text);
  background: var(--surface);
}
.r2-rail li:last-child::after {
  background: var(--marker);
}
.r2-rail::after {
  content: "";
  position: absolute;
  top: calc(1.45rem - 4px);
  right: 0.2rem;
  width: 9px;
  height: 9px;
  border-top: 2px solid var(--text);
  border-right: 2px solid var(--text);
  transform: rotate(45deg);
}
@media (max-width: 700px) {
  .r2-film {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
  .r2-film li {
    display: grid;
    grid-template-columns: 42% minmax(0, 1fr);
    column-gap: 0.9rem;
    align-content: start;
  }
  .r2-film figure {
    grid-row: 1 / span 3;
    margin: 0;
  }
  .r2-film li > :not(figure) {
    grid-column: 2;
  }
  .r2-film li + li figure::before {
    top: auto;
    right: auto;
    bottom: calc(100% + 0.45rem);
    left: 50%;
    transform: translateX(-50%) rotate(135deg);
  }
  .r2-film li > b,
  .r2-rail li > b {
    font-size: 1.2rem;
  }
  .r2-film li > span {
    font-size: 0.95rem;
  }
  .r2-rail {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-left: 1.75rem;
  }
  .r2-rail li {
    padding-top: 0;
  }
  .r2-rail time {
    position: static;
  }
  .r2-rail li::before {
    top: 0.5rem;
    bottom: -1.5rem;
    left: calc(-1.75rem + 6px);
    right: auto;
    border-top: 0;
    border-left: 2px solid var(--text);
  }
  .r2-rail li:last-child::before {
    bottom: 0.2rem;
    right: auto;
  }
  .r2-rail li::after {
    top: 0.2rem;
    left: -1.75rem;
  }
  .r2-rail::after {
    top: auto;
    right: auto;
    bottom: 0.15rem;
    left: 2.5px;
    transform: rotate(135deg);
  }
}

/* ---------- the cast: A, B, P0, P1 ---------- */
.r2-tag {
  flex: none;
  display: inline-grid;
  place-items: center;
  min-width: 2.3rem;
  height: 2.3rem;
  padding: 0 0.4rem;
  box-sizing: border-box;
  border: 1.5px solid var(--text);
  border-radius: 8px;
  background: var(--surface);
  font: 600 0.95rem/1 var(--font-sans);
  color: var(--text);
}
.r2-cast {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem 2rem;
  margin: 2rem 0 0;
}
.r2-cast > div {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}
.r2-cast p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--text-body);
}
.r2-cast strong,
.r2-cast2 strong {
  display: block;
  font: 600 1.2rem/1.2 var(--font-display);
  color: var(--text);
  margin-bottom: 0.15rem;
}
.r2-cast2 {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.5rem 2.5rem;
  margin: 2rem 0 0;
  align-items: start;
}
.r2-robots {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.r2-robots figure {
  margin: 0;
}
.r2-robots img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 0.65rem;
}
.r2-robots figcaption,
.r2-policies p {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.6rem;
  align-items: center;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text-body);
}
.r2-cast2 .r2-tag {
  grid-row: 1 / span 2;
  align-self: start;
  min-width: 2rem;
  height: 2rem;
  font-size: 0.85rem;
}
.r2-cast2 strong {
  margin: 0;
}
.r2-robots figcaption span,
.r2-policies p span {
  grid-column: 2;
}
.r2-policies .r2-train-arrow {
  position: relative;
  display: block;
  margin: 0.7rem 0;
  padding: 0.35rem 0 0.35rem 2.6rem;
  font: 600 0.8rem/1.3 var(--font-sans);
  color: var(--text-muted);
}
.r2-train-arrow::before {
  content: "";
  position: absolute;
  left: calc(1rem - 1px);
  top: 0;
  bottom: 0;
  border-left: 2px solid var(--text);
}
.r2-train-arrow::after {
  content: "";
  position: absolute;
  left: calc(1rem - 5px);
  bottom: 1px;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text);
  border-bottom: 2px solid var(--text);
  transform: rotate(45deg);
}
@media (max-width: 640px) {
  .r2-cast {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 760px) {
  .r2-cast2 {
    grid-template-columns: 1fr;
  }
}

/* ---------- the adapter diagram ---------- */
.r2-diagram {
  margin-block: 1.75rem 2rem;
}
.r2-diagram > .col > .pick,
.r2-diagram > .pick {
  margin-bottom: 1.25rem;
}
.r2-pics {
  display: grid;
  grid-template-columns:
    minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 0.75fr)
    auto minmax(0, 1fr);
  column-gap: 0.6rem;
  row-gap: 0.6rem;
}
.r2-pics figure {
  display: contents;
}
.r2-pics img {
  grid-row: 1;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 440 / 328;
  object-fit: cover;
  border-radius: 8px;
}
.r2-pics figcaption {
  grid-row: 2;
  text-align: left;
  font-size: 0.92rem;
  line-height: 1.35;
  color: var(--text-body);
}
.r2-pics figcaption b {
  display: block;
  font: 600 1.1rem/1.2 var(--font-display);
  color: var(--text);
  margin-bottom: 0.1rem;
}
.r2-pics figure:nth-of-type(1) > * {
  grid-column: 1;
}
.r2-pics figure:nth-of-type(2) > * {
  grid-column: 3;
}
.r2-pics figure:nth-of-type(3) > * {
  grid-column: 7;
}
.r2-pics .r2-step:nth-of-type(1) {
  grid-column: 2;
}
.r2-pics .r2-step:nth-of-type(2) {
  grid-column: 4;
}
.r2-pics .r2-step:nth-of-type(3) {
  grid-column: 6;
}
.r2-step {
  grid-row: 1;
  align-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  font: 600 0.74rem/1.1 var(--font-sans);
  color: var(--text-muted);
  white-space: nowrap;
}
.r2-step[data-part] {
  color: var(--text);
}
.r2-step[data-part]::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--sw);
}
.r2-step svg {
  width: 2.6rem;
  height: auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.r2-brain {
  grid-row: 1;
  grid-column: 5;
  align-self: center;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 0.8rem;
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--card-text);
  font: 0.85rem/1.3 var(--font-sans);
  text-align: center;
}
.r2-brain b {
  font-size: 0.95rem;
}
.r2-pics-note {
  max-width: calc(var(--col) - 2 * var(--gutter));
  margin: 1rem auto 0.5rem;
  font-size: 0.98rem;
  color: var(--text-body);
}
@media (max-width: 760px) {
  .r2-pics {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr);
    column-gap: 0.85rem;
  }
  .r2-pics img,
  .r2-pics figcaption,
  .r2-pics .r2-step,
  .r2-brain {
    grid-row: auto !important;
  }
  .r2-pics figure > img {
    grid-column: 1 !important;
  }
  .r2-pics figure > figcaption {
    grid-column: 2 !important;
    align-self: center;
  }
  .r2-pics .r2-step,
  .r2-brain {
    grid-column: 1 / -1 !important;
  }
  .r2-step {
    flex-direction: row;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.15rem 0;
  }
  .r2-step svg {
    width: 1.6rem;
    transform: rotate(90deg);
  }
}

.r2-lanes {
  display: grid;
  gap: 1.5rem;
  margin: 0 0 1rem;
}
.r2-lane h4 {
  font: 600 1.2rem/1.2 var(--font-display);
  color: var(--text);
  margin: 0 0 0.7rem;
}
.r2-lane ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.6rem;
}
.r2-lane li {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--panel-line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font-size: 0.93rem;
  line-height: 1.35;
  color: var(--text-body);
}
.r2-lane li[data-part] {
  box-shadow: inset 0 3px 0 var(--sw);
}
.r2-lane li b {
  display: block;
  font: 600 1.05rem/1.2 var(--font-display);
  color: var(--text);
  margin-bottom: 0.15rem;
}
.r2-lane li + li::before {
  content: "";
  position: absolute;
  top: 50%;
  right: calc(100% + 0.55rem);
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--text);
  border-right: 2px solid var(--text);
  transform: translateY(-50%) rotate(45deg);
}
@media (max-width: 760px) {
  .r2-lane ol {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  .r2-lane li + li::before {
    top: auto;
    right: auto;
    bottom: calc(100% + 0.3rem);
    left: 50%;
    transform: translateX(-50%) rotate(135deg);
  }
}

/* ---------- how the adapter got there ---------- */
.r2-story {
  position: relative;
  list-style: none;
  padding: 0 0 0 2rem;
  margin: 1.25rem 0 2rem;
}
.r2-story::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 0.7rem;
  bottom: 0.9rem;
  border-left: 2px solid var(--panel-line);
}
.r2-story li {
  position: relative;
  margin: 0 0 1.05rem;
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--text-body);
}
.r2-story li b {
  color: var(--text);
}
.r2-story li::before {
  content: "";
  position: absolute;
  left: calc(-2rem + 0.55rem + 1px - 7px);
  top: 0.42em;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 3px;
  background: var(--sw, var(--text));
}
.r2-story li.is-problem::before {
  border-radius: 50%;
  border: 2px solid var(--loss);
  background: var(--surface);
}
.r2-story li.is-problem b {
  color: var(--loss);
}

.r2-stack {
  list-style: none;
  margin: 1.25rem 0 2rem;
  display: grid;
  gap: 1rem;
}
.r2-stack li {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: 0.45rem 1.2rem;
  align-items: center;
}
.r2-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.r2-chips i {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  border: 1.5px solid var(--sw, var(--border));
  background: var(--surface);
  font: 600 0.75rem/1 var(--font-sans);
  font-style: normal;
  color: var(--text);
  white-space: nowrap;
}
.r2-chips i[data-part]::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 2px;
  background: var(--sw);
}
.r2-chips i.off {
  border-style: dashed;
  border-color: var(--text-subtle);
  background: transparent;
  color: var(--text-subtle);
}
.r2-chips i.lock {
  border-color: var(--text);
  background: var(--text);
  color: var(--surface);
}
.r2-out {
  font-size: 0.92rem;
  line-height: 1.35;
  color: var(--text-muted);
}
.r2-out b {
  display: block;
  font-size: 1.05rem;
  color: var(--text);
}
.r2-out.is-no b::before {
  content: "\2717\00a0";
  color: var(--loss);
}
.r2-out.is-half b::before {
  content: "~\00a0";
  color: var(--part-lift);
}
.r2-out.is-yes b::before {
  content: "\2713\00a0";
  color: var(--win);
}
@media (max-width: 640px) {
  .r2-stack li {
    grid-template-columns: 1fr;
  }
}

/* ---------- training: before and after ---------- */
.r2-dots,
.r2-ba,
.r2-slope {
  margin: 1.75rem 0 0.5rem;
}
.r2-dots-lead {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}
.r2-dots-group + .r2-dots-group {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--panel-line);
}
.r2-dots-robot {
  margin: 0 0 0.45rem;
  font: 0.88rem/1.2 var(--font-sans);
  color: var(--text-muted);
}
.r2-dots-robot b {
  font: 600 1.2rem/1.2 var(--font-display);
  color: var(--text);
  margin-right: 0.35rem;
}
.r2-dotrow {
  display: grid;
  grid-template-columns: 5.4rem minmax(0, 17rem) 2.2rem;
  align-items: center;
  gap: 0.9rem;
  margin: 0.4rem 0;
}
.r2-when {
  font: 600 0.88rem/1.1 var(--font-sans);
  color: var(--text);
}
.r2-when small {
  margin-left: 0.35rem;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.r2-d {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(3px, 0.8vw, 7px);
}
.r2-d i {
  display: block;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--text-subtle) 0 17%,
    transparent 19%
  );
}
.r2-d i.w {
  background: var(--text);
}
.r2-d i.x {
  background: var(--loss);
}
.r2-d i.lost {
  background: none;
  box-shadow: inset 0 0 0 2px var(--loss);
}
.r2-dotrow > b {
  font: 600 1.7rem/1 var(--font-display);
  font-feature-settings: "lnum" 1;
  text-align: right;
  color: var(--text);
}
.r2-key {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  margin: 1.1rem 0 0;
  font: 0.82rem/1.3 var(--font-sans);
  color: var(--text-muted);
}
.r2-key i {
  display: inline-block;
  width: 0.8rem;
  height: 0.8rem;
  margin-right: 0.35rem;
  vertical-align: -0.12em;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--text-subtle) 0 17%,
    transparent 19%
  );
}
.r2-key i.w {
  background: var(--text);
}
.r2-key i.lost {
  background: none;
  box-shadow: inset 0 0 0 2px var(--loss);
}

.r2-ba-row {
  display: grid;
  grid-template-columns: minmax(6rem, 1fr) 6rem minmax(3rem, 9rem) 6rem minmax(
      4.5rem,
      1fr
    );
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.9rem 0;
}
.r2-ba-row + .r2-ba-row {
  border-top: 1px solid var(--panel-line);
}
.r2-ba-head {
  padding: 0 0 0.6rem;
  font: 600 0.88rem/1.2 var(--font-sans);
  color: var(--text);
}
.r2-ba-head small {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
}
.r2-ba-robot {
  font: 0.85rem/1.3 var(--font-sans);
  color: var(--text-muted);
}
.r2-ba-robot b {
  display: block;
  font: 600 1.2rem/1.2 var(--font-display);
  color: var(--text);
}
.r2-n {
  font: 600 2.7rem/1 var(--font-display);
  font-feature-settings: "lnum" 1;
  color: var(--text);
}
.r2-n small {
  margin-left: 0.15rem;
  font: 0.9rem var(--font-sans);
  color: var(--text-muted);
}
.r2-arrow {
  position: relative;
  height: 2px;
  background: var(--text);
}
.r2-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: -4px;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--text);
  border-right: 2px solid var(--text);
  transform: rotate(45deg);
}
.r2-delta {
  font: 600 1rem/1.2 var(--font-sans);
  color: var(--loss);
}
@media (max-width: 640px) {
  .r2-ba-row {
    grid-template-columns: 4rem minmax(1.5rem, 1fr) 4rem auto;
    gap: 0.4rem 0.7rem;
  }
  .r2-ba-row > .r2-ba-robot {
    grid-column: 1 / -1;
  }
  .r2-ba-head > span:first-child {
    display: none;
  }
  .r2-n {
    font-size: 2.1rem;
  }
}

.r2-slope svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 34rem;
  margin: 0 auto;
  font-family: var(--font-sans);
}
.r2-slope .ax {
  stroke: var(--panel-line);
  stroke-width: 2;
}
.r2-slope .hd {
  font-size: 15px;
  font-weight: 600;
  fill: var(--text);
}
.r2-slope .tk {
  font-size: 14px;
  fill: var(--text-muted);
}
.r2-slope .a,
.r2-slope .b {
  stroke: var(--text);
  stroke-width: 2.5;
  fill: none;
}
.r2-slope .b {
  stroke-dasharray: 7 5;
}
.r2-slope .pt {
  fill: var(--text);
}
.r2-slope .pt.loss {
  fill: var(--loss);
}
.r2-slope .lb {
  font-size: 16px;
  font-weight: 600;
  fill: var(--text);
}

/* ---------- why it got worse ---------- */
.r2-q {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem 2rem;
  margin: 1.75rem 0 1.5rem;
}
.r2-q h4,
.r2-wrow h4 {
  font: 600 1.2rem/1.25 var(--font-display);
  color: var(--text);
  margin: 0 0 0.2rem;
}
.r2-who {
  margin: 0 0 0.7rem;
  font: 0.82rem/1.3 var(--font-sans);
  color: var(--text-muted);
}
.r2-qn {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  margin: 0 0 0.7rem;
}
.r2-qn span {
  display: flex;
  flex-direction: column;
  align-items: center;
  font: 600 2.9rem/1 var(--font-display);
  font-feature-settings: "lnum" 1;
  color: var(--text);
}
.r2-qn small {
  margin-top: 0.3rem;
  font: 600 0.72rem/1.2 var(--font-sans);
  color: var(--text-muted);
}
.r2-qn i {
  font: 1.4rem/2.9rem var(--font-sans);
  font-style: normal;
  color: var(--text-muted);
}
.r2-q p:last-child {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.45;
  color: var(--text-body);
}
.r2-q p b {
  color: var(--text);
}
@media (max-width: 760px) {
  .r2-q {
    grid-template-columns: 1fr;
  }
  .r2-q > div + div {
    padding-top: 1.2rem;
    border-top: 1px solid var(--panel-line);
  }
}
.r2-wdots {
  display: grid;
  gap: 1.2rem;
  margin: 1.75rem 0 1.5rem;
}
.r2-wrow + .r2-wrow {
  padding-top: 1.2rem;
  border-top: 1px solid var(--panel-line);
}
.r2-wrow h4 {
  margin-bottom: 0.55rem;
}
.r2-wrow h4 small {
  margin-left: 0.4rem;
  font: 0.8rem var(--font-sans);
  color: var(--text-muted);
}
.r2-verdict {
  margin: 0.55rem 0 0;
  font: 600 0.95rem/1.3 var(--font-sans);
  color: var(--text);
}
.r2-dotrow-27 {
  grid-template-columns: minmax(0, 1fr) 2.2rem;
}
.r2-d-27 {
  grid-template-columns: repeat(27, minmax(0, 1fr));
  gap: 3px;
}
.r2-d-27 i {
  border-radius: 2px;
  aspect-ratio: 1 / 1.5;
  background: var(--panel-line);
}
.r2-d-27 i.w {
  background: var(--text);
}
@media (max-width: 640px) {
  .r2-dotrow {
    grid-template-columns: 3.2rem minmax(0, 1fr) 1.8rem;
    gap: 0.6rem;
  }
  .r2-when small {
    display: block;
    margin: 0.1rem 0 0;
  }
  .r2-dotrow > b {
    font-size: 1.4rem;
  }
  .r2-dotrow-27 {
    grid-template-columns: minmax(0, 1fr) 1.8rem;
  }
  .r2-d-27 {
    gap: 2px;
  }
}

/* one training sample: 40 planned actions, the robot runs the first 8 */
.r2-window {
  margin: 1.25rem 0 1.5rem;
}
.r2-cells {
  display: grid;
  grid-template-columns: repeat(40, minmax(0, 1fr));
  gap: 2px;
}
.r2-cells i {
  display: block;
  height: 1.6rem;
  border-radius: 2px;
  background: var(--panel-line);
}
.r2-cells i.run {
  background: var(--text);
}
.r2-window-key {
  display: grid;
  grid-template-columns: 8fr 32fr;
  gap: 0.6rem;
  margin: 0.5rem 0 0;
  font: 0.85rem/1.3 var(--font-sans);
  color: var(--text-muted);
}
.r2-window-key .run {
  color: var(--text);
  font-weight: 600;
}
@media (max-width: 640px) {
  .r2-window-key {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

/* ---------- ABBA ---------- */
.r2-abba-head {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1.25rem;
}
.r2-abba-head > :first-child {
  min-width: 0;
}
.r2-abba-title {
  margin-bottom: 0;
}
.r2-emoji {
  font-size: 0.85em;
}
.r2-guy {
  display: block;
  width: auto;
  height: 7.5rem;
}
.r2-flip {
  transform: scaleX(-1);
}
@media (max-width: 640px) {
  .r2-guy {
    height: 4.75rem;
  }
}
.r2-hover {
  margin: 1.5rem 0;
}
.r2-hover-pair {
  display: grid;
  grid-template-columns: 1.5fr 1.905fr;
  gap: 0.5rem;
}
.r2-hover img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}
.r2-hover figcaption {
  max-width: calc(var(--col) - 2 * var(--gutter));
  margin: 0.6rem auto 0;
}
.r2-calls {
  margin: 1.5rem 0;
}
.r2-calls-row {
  display: grid;
  grid-template-columns: repeat(29, minmax(0, 1fr)) auto;
  gap: 3px;
  align-items: center;
}
.r2-calls-row i,
.r2-calls-key i {
  display: block;
  border-radius: 2px;
  background: var(--text-subtle);
}
.r2-calls-row i {
  aspect-ratio: 1 / 1.7;
}
.r2-calls i.ready {
  background: var(--marker);
  box-shadow: inset 0 0 0 1.5px #c9a400;
}
.r2-calls i.open {
  background: var(--text);
}
.r2-calls-row .open {
  margin-left: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  background: var(--text);
  color: var(--surface);
  font: 600 0.78rem/1 var(--font-sans);
  white-space: nowrap;
}
.r2-calls-key {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.45rem;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text-body);
}
.r2-calls-key li {
  display: grid;
  grid-template-columns: 0.7rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
}
.r2-calls-key i {
  width: 0.7rem;
  height: 1.1rem;
  margin-top: 0.15rem;
}
.r2-calls-key b {
  margin-right: 0.3rem;
  font: 600 0.85rem/1 var(--font-sans);
  color: var(--text);
}
@media (max-width: 640px) {
  .r2-calls-row {
    gap: 2px;
  }
  .r2-calls-row .open {
    margin-left: 0.3rem;
    padding: 0.35rem 0.45rem;
    font-size: 0.7rem;
  }
}

/* ---------- 28 October, round 3 ----------
   His round-3 notes: the top says what, why and the hypothesis, followed by why I tried this (once the pull-out Why
   page), a bigger first video that says the Franka is painted in, a label on every clip for which robot is moving,
   the hypothesis line after the 7 of 12, and the page ending on what I learned and what to remember.
   html[data-proof] picks light or full proof wording; html[data-bots] picks how the robot labels look. */

.masthead h1 {
  font-kerning: auto;
}

/* ---------- the top: what, why, hypothesis, what happened ---------- */
.r3-top {
  margin-top: 1.6rem;
  text-align: left;
}
.r3-overview {
  padding: 1.35rem 1.6rem 1.5rem;
}
.r3-ov-h {
  font: 600 1.6rem/1.2 var(--font-display);
  margin: 0 0 1rem;
}
.r3-ov {
  margin: 0;
  display: grid;
  gap: 1.15rem;
}
.r3-ov > div {
  display: grid;
  grid-template-columns: 8.25rem minmax(0, 1fr);
  gap: 1.25rem;
  align-items: baseline;
}
.r3-ov > div + div {
  border-top: 1px solid rgba(23, 23, 23, 0.1);
  padding-top: 1.15rem;
}
.r3-ov dt {
  font: 600 0.86rem/1.3 var(--font-sans);
  color: var(--text);
}
.r3-ov dd {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.55;
  color: var(--text-body);
}
.r3-ov dd p {
  margin: 0;
}
.r3-ov-why,
.r3-ov-hyp {
  list-style: none;
  padding: 0;
  margin: 0.7rem 0 0;
  display: grid;
  gap: 0.6rem;
}
.r3-ov-why li {
  position: relative;
  padding-left: 1.05rem;
}
.r3-ov-why li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--text);
}
.r3-ov strong {
  color: var(--text);
}
.r3-ov-hyp {
  gap: 0.8rem;
}
.r3-ov-hyp .r3-out {
  display: inline-block;
  margin-top: 0.4rem;
}

/* the top, as four questions */
.r3-qs-wrap .r3-ov-h {
  margin-bottom: 0.85rem;
}
.r3-qs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}
.r3-q h3 {
  font: 600 1.3rem/1.25 var(--font-display);
  color: var(--text);
  margin: 0 0 0.45rem;
}
.r3-q p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-body);
}

/* ---------- why I tried this (was the pull-out Why page) ---------- */
.r3-origin-top {
  margin-top: 2.5rem;
  text-align: left;
}
.r3-origin {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 2rem;
  align-items: start;
}
.r3-origin-photo {
  margin: 0.35rem 0 0;
}
.r3-origin-photo img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}
/* side by side, a portrait crop on him fills the height of the text beside it */
@media (min-width: 761px) {
  .r3-origin-photo img {
    aspect-ratio: 3 / 4;
    object-fit: cover;
    object-position: 45% 50%;
  }
}
.r3-origin-text h2 {
  margin-top: 0;
}
.masthead .r3-origin-text h2 {
  font: 600 1.6rem/1.2 var(--font-display);
  margin: 0 0 0.8rem;
}
.r3-origin-text p {
  margin: 0 0 0.85rem;
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--text-body);
}
.r3-origin-text p.r3-origin-credit {
  margin: 0.4rem 0 0;
  font: 0.74rem/1.4 var(--font-sans);
  color: var(--text-muted);
}
.r3-origin-credit a {
  color: inherit;
}
.r3-origin-top .pick {
  margin: 0 0 1.25rem;
}
.masthead > .wrap > .r2-film {
  margin-top: 2.5rem;
}

/* ---------- labels on clips: which robot, and what's painted ---------- */
.r3-chip {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.55rem 0.22rem 0.25rem;
  border-radius: 6px;
  background: rgba(17, 17, 17, 0.74);
  color: #f5f5f5;
  font: 600 0.74rem/1.2 var(--font-sans);
  letter-spacing: 0.01em;
  white-space: nowrap;
  pointer-events: none;
}
.r3-chip b {
  display: inline-grid;
  place-items: center;
  min-width: 1.35rem;
  height: 1.35rem;
  border: 1.5px solid currentColor;
  border-radius: 4px;
  font-size: 0.72rem;
}
.r3-chip i {
  font-style: normal;
  display: none;
}
.r3-chip.r3-paint {
  background: var(--marker);
  color: #171717;
  padding-left: 0.55rem;
}
html[data-bots="text"] .r3-chip:not(.r3-real) b {
  display: none;
}
html[data-bots="text"] .r3-chip:not(.r3-real) i {
  display: inline;
}
html[data-bots="text"] .r3-chip:not(.r3-real) {
  padding-left: 0.55rem;
}
html[data-bots="none"] .r3-chip:not(.r3-real):not(.r3-paint) {
  display: none;
}
.gallery .r3-chip {
  top: 0.35rem;
  left: 0.35rem;
  gap: 0.25rem;
  padding: 0.12rem 0.4rem 0.12rem 0.15rem;
  font-size: 0.62rem;
}
.gallery .r3-chip b {
  min-width: 1.05rem;
  height: 1.05rem;
  font-size: 0.6rem;
}
html[data-bots="text"] .gallery .r3-chip {
  padding-left: 0.4rem;
}
.r2-film .r3-chip {
  top: 0.4rem;
  left: 0.4rem;
  font-size: 0.66rem;
}
.r2-hover-pair {
  position: relative;
}

/* ---------- the first video, big ---------- */
.r3-bleed {
  position: relative;
  left: 50%;
  width: min(calc(100vw - 3rem), 1280px);
  transform: translateX(-50%);
}
.r3-bleed figcaption {
  max-width: calc(var(--col) - 2 * var(--gutter));
  margin-inline: auto;
}
.r3-panes {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  pointer-events: none;
}
.r3-panes .r3-chip {
  position: static;
  justify-self: start;
  align-self: start;
  margin: 0.8rem;
  font-size: 0.86rem;
}
.r3-panes .r3-chip b {
  min-width: 1.5rem;
  height: 1.5rem;
}

/* ---------- the first video, flipping between views ---------- */
.r3-flip {
  max-width: 62rem;
  margin: 0 auto;
}
.r3-flip-btns {
  display: flex;
  justify-content: center;
  margin: 0 0 0.75rem;
}
.r3-flip-btns button {
  font: 600 0.85rem/1.2 var(--font-sans);
  padding: 0.5rem 1rem;
  border: 1.5px solid var(--text);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.r3-flip-btns button:first-child {
  border-radius: 999px 0 0 999px;
}
.r3-flip-btns button:last-child {
  border-left: 0;
  border-radius: 0 999px 999px 0;
}
.r3-flip-btns button[aria-pressed="true"] {
  background: var(--text);
  color: var(--surface);
}
.r3-flip-btns button:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}
.r3-flip-media {
  aspect-ratio: 640 / 328;
}
.r3-flip-media video.r3-flip-video {
  width: 200%;
  max-width: none;
  height: 100%;
  transition: transform 0.5s ease;
}
.r3-flip[data-view="painted"] .r3-flip-media video {
  transform: translateX(-50%);
}
.r3-flip .r3-chip {
  top: 0.8rem;
  left: 0.8rem;
  font-size: 0.86rem;
}
.r3-flip-paint,
.r3-flip[data-view="painted"] .r3-flip-real {
  display: none;
}
.r3-flip[data-view="painted"] .r3-flip-paint {
  display: inline-flex;
}

/* ---------- hypothesis verdicts ---------- */
.r3-out {
  justify-self: start;
  font: 600 0.78rem/1.3 var(--font-sans);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1.5px solid currentColor;
  white-space: nowrap;
}
.r3-yes {
  color: var(--win);
}
.r3-no {
  color: var(--loss);
}
.r3-yes::before {
  content: "\2713\00a0";
}
.r3-no::before {
  content: "\2717\00a0";
}

/* ---------- after the 7 of 12 ---------- */
.r3-confirm {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  margin: 1.1rem 0 0.6rem;
  font: 600 1.3rem/1.35 var(--font-display);
  color: var(--text);
}
.r3-confirm > span:last-child {
  flex: 1;
  min-width: 0;
}
.r3-tick {
  flex: none;
  position: relative;
  width: 1.35rem;
  height: 1.35rem;
  margin-top: 0.2rem;
  border-radius: 50%;
  background: var(--win);
}
.r3-tick::after {
  content: "";
  position: absolute;
  left: 0.48rem;
  top: 0.24rem;
  width: 0.32rem;
  height: 0.62rem;
  border: solid #fff;
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

/* ---------- the ending ---------- */
#notes .learned-title,
#learned .learned-title {
  display: none;
}
.r3-remember {
  list-style: none;
  margin: 1rem 0 0;
  padding: 1.15rem 1.4rem;
  display: grid;
  gap: 0.9rem;
}
.r3-remember li {
  position: relative;
  padding-left: 1.15rem;
  line-height: 1.55;
}
.r3-remember li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--text);
}
.r3-remember strong {
  color: var(--text);
}
.r3-abstract {
  margin: 1rem 0 0;
  padding: 1.15rem 1.4rem;
  font-size: 1.05rem;
  line-height: 1.65;
}

/* ---------- light or full proof ---------- */
html:not([data-proof="full"]) .r3-full,
html[data-proof="full"] .r3-lite {
  display: none !important;
}

/* ---------- reading order: old/new pairs, shown by html[data-order]; "marked" highlights each change ---------- */
span.r3-old,
span.r3-new {
  display: inline !important;
}
html:not([data-order="before"]) .r3-old,
html[data-order="before"] .r3-new,
html:not([data-order="before"]) span.r3-old,
html[data-order="before"] span.r3-new {
  display: none !important;
}
html[data-order="marked"] .r3-mk {
  background: linear-gradient(
    transparent 10%,
    rgba(255, 214, 72, 0.5) 10%,
    rgba(255, 214, 72, 0.5) 92%,
    transparent 92%
  );
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  border-radius: 2px;
}
html[data-order="marked"] .r3-mkb > details:first-child > summary {
  background: rgba(255, 214, 72, 0.5);
}

@media (max-width: 760px) {
  .r3-origin {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }
  .r3-origin-photo {
    margin: 0;
  }
}
@media (max-width: 640px) {
  .r3-overview {
    padding: 1.05rem 1.1rem 1.2rem;
  }
  .r3-ov > div {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .r3-qs {
    grid-template-columns: 1fr;
  }
  .r3-origin-top {
    margin-top: 2rem;
  }
  .masthead > .wrap > .r2-film {
    margin-top: 2rem;
  }
  .r3-bleed {
    left: auto;
    width: auto;
    transform: none;
  }
  .r3-bleed figcaption {
    padding: 0 var(--gutter);
  }
  .r3-panes {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .r3-panes .r3-chip,
  .r3-flip .r3-chip {
    margin: 0.45rem;
    font-size: 0.68rem;
  }
  .r3-flip .r3-chip {
    margin: 0;
    top: 0.45rem;
    left: 0.45rem;
  }
  .r3-confirm {
    font-size: 1.15rem;
  }
  .r3-out {
    white-space: normal;
  }
}
@media (prefers-reduced-motion: reduce) {
  .r3-flip-media video.r3-flip-video {
    transition: none;
  }
}

/* ---------- options page only ---------- */
.optdone {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 0 0.55rem;
  font: 0.74rem/1.3 var(--font-sans);
  color: var(--bar-muted);
}
.r3-pick-top {
  margin-top: 1rem;
}
.r3-pickband {
  margin-top: 1.5rem;
}

/* the ABBA clip has its run labels burned into the top edge */
#abba .media > .r3-chip {
  top: auto;
  bottom: 0.55rem;
}

/* the film strip and captions colour their own <b>; the chip's letter keeps the chip's colour */
span.r3-chip > b,
span.r3-chip > i {
  color: inherit;
  font-weight: 600;
}
@media (max-width: 700px) {
  .r2-film .r3-chip {
    max-width: calc(100% - 0.8rem);
    white-space: normal;
    font-size: 0.58rem;
  }
  .r2-film .r3-chip b {
    min-width: 1.05rem;
    height: 1.05rem;
  }
}

/* ---------- third pass: short overview, video, why, steps ---------- */
.r3-short p {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-body);
}
.r3-short p:last-child {
  margin-bottom: 0;
}
.r3-short strong {
  color: var(--text);
}
.r3-pick-under {
  margin-top: 1rem;
}
#why-do-this,
#process {
  padding-top: 2.5rem;
}
.r3-origin-in {
  margin-top: 2.25rem;
}
.r3-origin-text h3 {
  font: 600 1.5rem/1.2 var(--font-display);
  margin: 0 0 0.75rem;
}
.r3-steps {
  margin-top: 1.25rem;
}
.r3-steps .r3-out {
  display: inline-block;
  margin-top: 0.6rem;
  font-style: normal;
}
.r3-built-h {
  text-align: center;
  margin-bottom: 0;
}
@media (max-width: 640px) {
  .masthead {
    padding-top: 1.75rem;
    padding-bottom: 0.75rem;
  }
  .masthead .venue {
    margin-top: 0;
  }
  .masthead .links {
    margin-top: 0.75rem;
  }
  .r3-short {
    margin-top: 1rem;
    padding: 0.9rem 1rem;
  }
  .r3-short .r3-ov-h {
    font-size: 1.2rem;
    margin-bottom: 0.45rem;
  }
  .r3-short p {
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 0.5rem;
  }
  .masthead .byline {
    margin-top: 0.9rem;
    margin-bottom: 0.4rem;
  }
}

/* Connected paper opening: one reading column, no card grid. */
.r3-paper-summary { margin: 1.5rem 0 0; padding: 1.2rem 0; border-top: 1px solid #ccc; border-bottom: 1px solid #ccc; }
.r3-paper-summary p { font-size: 1.02rem; line-height: 1.65; margin: 0 0 .85rem; }
.r3-paper-summary p:last-child { margin-bottom: 0; }
.r3-view-guide { padding: 2rem 0 1rem; }
.r3-view-guide p { font-size: 1rem; line-height: 1.65; }

.r3-paper-summary h3 {font:600 1.4rem/1.3 var(--font-display); margin:1.5rem 0 .5rem;}
.r3-paper-summary li {font-size:1.02rem;line-height:1.65;margin:.6rem 0;}

/* Accepted local-site refinement: a narrower paper reading measure. */
:root { --col: 46rem; --wide: 64rem; }
.r3-bleed { width: min(calc(100vw - 3rem), 1100px); }
@media (max-width: 640px) { .r3-bleed { width: auto; } }