/* Physical AI Atlas, inside the LongShort site shell. */
.pai {
  --bg: #070b14;
  --surface: #121a2b;
  --ink: #f4f7fb;
  --muted: #c5d0de;
  --line: #2a384f;
  --blue: #9ec5ff;
  --gold: #e0c48a;
  --focus: #f4f7fb;
  --max: 1080px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.5;
}
html { scroll-behavior: smooth; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: #000;
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }
.pai a { color: var(--blue); }
a:focus, button:focus, summary:focus,
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}
.principle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.chrome {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-page, #0d1117);
  padding: 0.85rem 0 0.65rem;
  border-bottom: 1px solid var(--line);
}
.chrome a { text-decoration: none; }
.chrome a[aria-current="true"] { text-decoration: underline; font-weight: 700; }
.banner {
  margin: 0;
  padding: 0.4rem 1.25rem 0.55rem;
  text-align: center;
  background: #1a1408;
  color: var(--gold);
  border-top: 1px solid #3a2e16;
  font-size: 0.85rem;
}
main.pai { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem 4rem; }
section { margin: 2.5rem 0; scroll-margin-top: 12rem; }
.path, .evidence { scroll-margin-top: 12rem; }
.ideas {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}
.ideas li {
  margin: 0;
  padding: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--line);
}
.ideas strong { display: block; margin-bottom: 0.35rem; }
.detached {
  margin-top: 1.75rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--line);
}
.layer { margin: 1rem 0 0.25rem; font-size: 0.95rem; color: var(--blue); }
.more { margin-top: 1rem; }
h1 { font-size: 2rem; line-height: 1.25; font-weight: 650; margin: 0 0 0.75rem; }
h2 { font-size: 1.45rem; margin: 0 0 0.75rem; }
#race > p { margin: 1.15rem 0 0; }
#task > h2 + h2 { margin-top: 1.35rem; }
h3 { font-size: 1.15rem; margin: 0 0 0.5rem; }
.lede { font-size: 1.2rem; color: var(--ink); }
.quiet { color: var(--muted); }
.visual-slot {
  margin: 1.15rem 0;
  padding: 1rem 1rem 0.95rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
}
.slot-kicker {
  margin: 0;
  color: var(--blue);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.slot-note { color: var(--muted); font-size: 0.95rem; }
.chain, .bodies, .ladder, .questions, .episodes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.4rem;
  margin: 0.75rem 0;
  padding: 0;
  list-style: none;
}
.chain li, .bodies li, .ladder li, .questions li, .episodes li {
  margin: 0;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  background: #0c1220;
  flex: 1 1 7.5rem;
}
.chain li, .ladder li { position: relative; }
.chain li:not(:last-child)::after,
.ladder li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -1.05rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--blue);
  font-size: 0.95rem;
}
.qgrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin: 0.75rem 0;
  padding: 0;
  list-style: none;
}
.qgrid li {
  margin: 0;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  background: #0c1220;
}
.qgrid span {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--gold);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.example { margin: 0 0 0.35rem; color: var(--muted); }
.bodies { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.65rem; }
.bodies li { flex: none; text-align: center; }
.episodes { flex-direction: column; align-items: stretch; max-width: 36rem; }
.episodes li { flex: none; }
.episodes li.break { margin-top: 1.6rem; border-style: dashed; position: relative; }
.episodes li.break::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -0.95rem;
  border-top: 1px dashed var(--gold);
}
.outside {
  margin: 0.75rem 0 0;
  padding: 0.55rem 0.7rem;
  border: 1px dashed var(--line);
  color: var(--muted);
}
.equation {
  display: grid;
  gap: 0.35rem;
  margin: 0.5rem auto;
  max-width: 28rem;
  text-align: center;
}
.equation ul, .numerator {
  list-style: none;
  margin: 0 auto;
  padding: 0.5rem 0 0.25rem;
  display: grid;
  gap: 0.65rem;
  max-width: 24rem;
}
.numerator li {
  display: grid;
  grid-template-columns: 1.4rem 2.4rem 1fr;
  align-items: center;
  gap: 0.65rem;
  text-align: left;
}
.numerator li::before { content: "+"; color: var(--gold); font-size: 1.15rem; }
.numerator li:first-child::before { content: ""; }
.numerator .mark { width: 36px; height: 36px; }
.divide {
  margin: 0.85rem 0 0;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}
.equals { margin: 0.35rem 0 0; color: var(--gold); font-size: 1.6rem; }
.equation .bar {
  border-top: 2px solid var(--gold);
  margin-top: 0.85rem;
  padding-top: 0.9rem;
  font-weight: 700;
  font-size: 1.25rem;
}
.unresolved { color: var(--gold); font-size: 1.15rem; margin: 0.85rem 0 0; }
.path, .evidence, .company {
  margin: 1rem 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
}
dl { margin: 0; }
dt { font-weight: 700; margin-top: 0.65rem; }
dd { margin: 0.15rem 0 0; }
.verdict {
  display: grid;
  grid-template-columns: 13.5rem 1fr;
  gap: 0.35rem 0.85rem;
  margin: 0.85rem 0 0.35rem;
}
.verdict dt, .verdict dd { margin: 0; }
.verdict dt { color: var(--muted); font-weight: 650; }
.pai details { margin-top: 0.75rem; }
.pai summary { cursor: pointer; color: var(--blue); }
.line { margin-top: 0.45rem; }
.line summary { font-size: 0.92rem; }
.foot {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 1rem 1.25rem 2rem;
  max-width: var(--max);
  margin: 0 auto;
}
.hero {
  margin: 0.25rem 0 0.5rem;
  padding: 1.35rem 1.15rem 1.2rem;
  background:
    radial-gradient(ellipse at 0% 0%, rgba(113, 188, 224, 0.16), transparent 58%),
    radial-gradient(ellipse at 100% 80%, rgba(224, 196, 138, 0.08), transparent 42%),
    #0c1220;
  border-top: 3px solid #71bce0;
}
.signals { margin: 1.15rem 0 0; }
.signals ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.signals li {
  margin: 0;
  padding: 0.85rem 0.9rem 0.95rem;
  background: #101820;
  border: 1px solid var(--line);
  border-top: 3px solid #71bce0;
}
.signals li:last-child { border-top-color: #c6a15b; }
.signals .mark { width: 36px; height: 36px; margin-bottom: 0.55rem; }
.signals strong { display: block; font-size: 1.02rem; line-height: 1.3; }
.signals li p { margin: 0.4rem 0 0; color: var(--muted); font-size: 0.92rem; }
.instead {
  margin-top: 0.7rem;
  padding: 0.9rem 1rem;
  border: 1px solid #3a2e16;
  background: #1a1408;
}
.instead-kicker {
  margin: 0 0 0.25rem;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.instead p:last-child { margin: 0; font-size: 1.05rem; }
.gold-close, .gold-note {
  color: var(--gold);
  font-weight: 650;
}
.gold-close { margin: 0.25rem 0 1.5rem; font-size: 1.05rem; }
.gold-note {
  margin: 0.85rem 0 0.35rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid #3a2e16;
  background: #1a1408;
}
.mark { width: 52px; height: 52px; color: var(--blue); display: block; }
.mark-lg { width: 100%; height: auto; max-width: 150px; }
.chain li, .ladder li, .bodies li {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.45rem;
}
.chain, .ladder {
  width: min(100%, 44rem);
  margin-left: auto;
  margin-right: auto;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 0.45rem 1.35rem;
}
.chain li, .ladder li {
  flex: 1 1 0;
  min-width: 0;
  padding: 0.5rem 0.28rem 0.55rem;
}
.chain .mark, .ladder .mark { width: 34px; height: 34px; }
.chain li span, .ladder li span { font-size: 0.84rem; line-height: 1.25; }
.chain li:not(:last-child)::after,
.ladder li:not(:last-child)::after {
  content: "";
  width: 1.35rem;
  height: 1.35rem;
  right: -1.35rem;
  top: 50%;
  transform: translateY(-50%);
  background: center / 1.15rem 1.15rem no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M3 12h16M14 6l6 6-6 6' fill='none' stroke='%239ec5ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.outside {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.85rem 0 0;
  padding: 0.7rem 0.85rem;
  border: 1px dashed var(--line);
  color: var(--muted);
}
.outside .mark { width: 42px; height: 42px; flex: 0 0 auto; }
.qgrid li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}
.qgrid .state, .pill {
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.qgrid em { color: var(--muted); font-style: normal; font-size: 0.9rem; }
.established {
  display: block;
  margin: 0 0 1rem;
  padding: 1rem 1.1rem;
  background: #101820;
  border-left: 3px solid #9ec5ff;
  font-size: 1.08rem;
}
.established strong { display: block; margin: 0.15rem 0 0.2rem; font-size: 1.2rem; }
.proven-line {
  margin: 0 0 0.85rem;
  color: var(--gold);
  font-size: 1.15rem;
  font-weight: 650;
}
.pill {
  display: inline-block;
  margin: 0 0.35rem 0.35rem 0;
  padding: 0.12rem 0.45rem;
  border: 1px solid #3a2e16;
  border-radius: 999px;
}
.pill-set { color: var(--blue); border-color: var(--line); }
.pills { margin: 0.2rem 0 0.55rem; }
.episodes li {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-align: left;
}
.episodes strong { display: block; }
.episodes em { display: block; color: var(--gold); font-style: normal; font-size: 0.9rem; }
.poster {
  margin: 1.25rem 0 2rem;
  padding: 2.5rem 1rem 2rem;
  text-align: center;
}
.poster p:first-child {
  margin: 0 0 0.8rem;
  font-size: clamp(1.65rem, 3.2vw, 2.55rem);
  line-height: 1.2;
  font-weight: 650;
}
.poster-line {
  margin: 0;
  color: var(--gold);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}
.econ-section { padding-top: 1rem; }
.econ-hero { margin-top: 0.5rem; padding: 1.5rem 1.1rem; }
#task-map { display: flex; flex-direction: column; }
#task-map > #path-figure-2025 { order: 3; }
#task-map > #path-digit-gxo { order: 4; }
#task-map > #path-longcheer { order: 5; }
#task-map > .also-kicker { order: 6; }
#task-map > .path.compact { order: 7; }
.also-kicker {
  margin: 1.6rem 0 0.2rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.fold > summary { cursor: pointer; list-style: none; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2rem 0.7rem; }
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary h3 { margin: 0; font-size: 0.98rem; font-weight: 550; color: var(--ink); }
.fold > summary h3::before { content: "+ "; color: var(--blue); font-weight: 650; }
.fold[open] > summary h3::before { content: "– "; }
.fold > summary .pills { margin: 0; }
.fold > summary .pill { margin: 0; font-size: 0.68rem; }
.path.featured h3 { font-size: 1.38rem; line-height: 1.25; }
.path.featured {
  margin: 0.9rem 0;
  padding: 1.25rem 1.35rem 0.55rem;
  background: #0c1220;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
}
.path.compact { margin: 0; padding: 0; border-top: 0; border-bottom: 1px solid var(--line); }
.path.compact h3 { font-size: 0.98rem; }
.path.compact > p { font-size: 0.98rem; }
.path.compact .fold > summary { padding: 0.38rem 0; }
.glance img { width: 100%; height: auto; margin-top: 0.75rem; }
.bodies-slot { margin-top: 2rem; }
@media (max-width: 900px) {
  .bodies, .qgrid { grid-template-columns: 1fr 1fr; }
  .signals ol { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  h1 { font-size: 1.6rem; }
  .principle { white-space: normal; }
  .ideas, .verdict, .qgrid { grid-template-columns: 1fr; }
  .bodies { grid-template-columns: 1fr 1fr; }
  .hero { grid-template-columns: 1fr; }
  .chain, .ladder {
    flex-direction: column;
    align-items: stretch;
    width: min(100%, 18rem);
    gap: 1.15rem 0;
  }
  .chain li, .ladder li { width: 100%; flex: none; }
  .chain li:not(:last-child)::after,
  .ladder li:not(:last-child)::after {
    content: "";
    width: 1.15rem;
    height: 1.15rem;
    border: 0;
    right: auto;
    left: 50%;
    top: auto;
    bottom: -1.15rem;
    margin: 0;
    transform: translateX(-50%);
    background: center / 1.15rem 1.15rem no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 3v16M6 14l6 6 6-6' fill='none' stroke='%239ec5ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  }
}