/* Isolated Physical AI editorial components; inherits the approved Lab theme. */
:root {
  --pa-xs: .75rem;
  --pa-sm: .875rem;
  --pa-body: clamp(1rem, .95rem + .25vw, 1.125rem);
  --pa-title: clamp(2.1rem, 1.5rem + 2.3vw, 3.5rem);
  --pa-heading: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --pa-gap: 1.5rem;
}
.pa-feature .feature-copy h2 { font-size: clamp(1.65rem, 1.2rem + 1.7vw, 2.45rem); margin-block: .75rem; }
.pa-feature .feature-copy .tag, .pa-card .tag { line-height: 1.65; }
.pa-art {
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: .75rem;
  color: var(--text);
}
.pa-art-label { display: block; font-size: var(--pa-xs); color: var(--muted); letter-spacing: .16em; text-transform: uppercase; }
.pa-art ol { list-style: none; margin: 1rem 0 0; padding: 0; counter-reset: loop; }
.pa-art li {
  display: flex; align-items: center; gap: 1rem; padding: .5rem 0;
  border-bottom: 1px solid var(--line); font-size: 1.125rem; font-weight: 700;
  counter-increment: loop;
}
.pa-art li::before { content: "0" counter(loop); font-size: var(--pa-xs); color: var(--bright); font-weight: 500; }
.pa-art li:last-child { border-bottom: 0; }
.pa-art small { display: block; color: var(--muted); margin-top: 1rem; font-size: var(--pa-xs); }
.pa-card .pa-art { border-radius: 0; border-width: 0 0 1px; padding: 1.5rem; }
.pa-card .pa-art ol { display: flex; flex-wrap: wrap; gap: .5rem 1rem; margin-top: .75rem; }
.pa-card .pa-art li { font-size: var(--pa-sm); border: 0; padding: 0; gap: .375rem; }
.pa-card .pa-art small { display: none; }
.pa-breadcrumb { display: flex; flex-wrap: wrap; gap: .5rem; padding-block: 1.5rem .5rem; font-size: var(--pa-sm); color: var(--muted); }
.pa-breadcrumb a { text-decoration: underline; text-underline-offset: .2em; }
.pa-header { max-width: 960px; margin: 0 auto; padding-block: 2rem; }
.pa-status { font-size: var(--pa-sm); color: var(--muted); margin-bottom: 1.5rem; }
.pa-header h1 { font-size: var(--pa-title); line-height: 1.13; max-width: 24ch; margin-block: 1rem; text-wrap: balance; }
.pa-deck { font-size: clamp(1.125rem, 1rem + .5vw, 1.375rem); color: var(--muted); max-width: 60ch; }
.pa-byline { display: flex; flex-wrap: wrap; gap: .5rem 1rem; font-size: var(--pa-sm); margin-top: 1.5rem; }
.pa-byline span + span { color: var(--muted); }
.pa-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(2rem, 5vw, 5rem); align-items: start; padding-block: 1rem 4rem; }
.pa-toc { position: sticky; top: 112px; padding-top: .5rem; }
.pa-toc h2 { font-size: 1rem; letter-spacing: 0; margin-bottom: .75rem; }
.pa-toc a { display: block; padding: .625rem 0; border-bottom: 1px solid var(--line); font-size: var(--pa-sm); line-height: 1.5; color: var(--muted); }
.pa-toc a:hover { color: var(--text); }
.pa-prose { max-width: 70ch; font-size: var(--pa-body); line-height: 1.85; }
.pa-prose p { margin: 0 0 1.25rem; }
.pa-prose h2 { font-size: var(--pa-heading); margin: 2.75rem 0 1.25rem; line-height: 1.3; }
.pa-prose a { color: var(--bright); text-decoration: underline; text-underline-offset: .2em; text-decoration-thickness: 1px; }
.pa-prose a:hover { color: var(--text); }
.pa-prose blockquote { margin: 0 0 2rem; padding: 1.5rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--bg2); color: var(--muted); font-size: var(--pa-sm); line-height: 1.75; }
.pa-prose blockquote p:last-child { margin-bottom: 0; }
.pa-tests { margin-block: 2.5rem; padding: clamp(1.25rem, 3vw, 2rem); background: var(--surface); border: 1px solid var(--line); border-radius: .75rem; }
.pa-tests h2 { margin-top: 0; }
.pa-tests ul { list-style: none; padding: 0; margin: 1.5rem 0; }
.pa-tests li { border-top: 1px solid var(--line); padding: 1rem 0; line-height: 1.7; }
.pa-tests li strong { display: block; margin-bottom: .25rem; }
.pa-tests > p:last-child { margin-bottom: 0; }
.pa-end { padding-top: .5rem; margin-top: 2rem; border-top: 1px solid var(--line); }
.pa-end .button { color: #fff; text-decoration: none; }
.pa-related { display: block; padding-top: 1.25rem; margin-top: 1rem; border-top: 1px solid var(--line); }
.pa-related a { color: var(--bright); text-decoration: underline; text-underline-offset: .2em; font-weight: 700; }
.pa-related .fine { display: block; margin-top: .5rem; }
@media (max-width: 960px) {
  .pa-layout { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .pa-toc { position: static; max-width: 70ch; }
  .pa-toc nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 1.5rem; }
}
@media (max-width: 600px) {
  .pa-header { padding-top: 1rem; }
  .pa-toc nav { grid-template-columns: minmax(0, 1fr); }
  .pa-prose { line-height: 1.8; }
  .pa-feature .pa-art ol { display: flex; flex-wrap: wrap; gap: .5rem 1rem; }
  .pa-feature .pa-art li { border: 0; font-size: 1rem; }
}
@media print {
  .header, .footer, .pa-toc, .pa-breadcrumb, .pa-end .button { display: none; }
  .pa-layout { display: block; }
  .pa-prose { max-width: none; }
}

.pa-end > small { display:block; margin-top:1rem; }