/* Shared learning surfaces use the selected theme's semantic colors. */
.learning-shortcuts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:0 0 28px}
.learning-shortcuts a{display:block;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:16px 19px;text-decoration:none;transition:border-color .15s}
.learning-shortcuts a:hover{border-color:var(--green);background:var(--accent-soft)}
.learning-shortcuts span{display:block;color:var(--muted);font-size:11px;margin-bottom:6px}
.learning-shortcuts b{font-size:13px;font-weight:600}
.understand-video{margin:25px 0 30px}.understand-video>h3{font-size:19px;margin-bottom:14px}
.history-tour{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:25px 0 30px;background:var(--surface)}
.history-tour-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:17px 20px;border-bottom:1px solid var(--line)}
.history-tour-heading a{font-size:11px;color:var(--green)}
.history-stage-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line);background:var(--surface-soft);gap:1px}
.history-stage-buttons button{padding:14px;text-align:left;border:0;border-radius:0;background:var(--surface-soft);color:var(--ink)}
.history-stage-buttons button:hover{background:var(--accent-soft)}
.history-stage-buttons button[aria-pressed="true"]{background:var(--green);color:var(--on-accent)}
.history-stage-buttons small{display:block;font-size:10px;opacity:.8;margin-bottom:5px}.history-stage-buttons b{font-size:12px;font-weight:600}
#history-stage-detail{padding:22px}.history-stage-copy>.eyebrow{line-height:1.6;font-size:10px}
.history-stage-copy h3{font-size:23px;margin:8px 0 12px}.history-stage-copy p{font-size:13px;line-height:1.8;margin:9px 0}
.history-control{border-left:3px solid var(--accent-line);padding:12px 16px;margin:18px 0;background:var(--surface-soft)}
.history-control b{font-size:12px}.history-control p{margin:5px 0 0}
#history-stage-detail .learning-video{margin-top:22px}.history-tour>.button{margin:0 22px 22px;font-size:12px}
.media-heading h2{font-size:36px;margin:10px 0}.media-heading>p{color:var(--muted);line-height:1.8;font-size:14px}
.media-tabs{display:flex;border-bottom:1px solid var(--line);gap:24px;margin:22px 0 25px}
.media-tabs a{padding:14px 0;border-bottom:3px solid transparent;font-size:14px;font-weight:600;text-decoration:none}
.media-tabs a[aria-current="page"]{border-bottom-color:var(--green);color:var(--green)}
.media-tabs small{font-size:10px;background:var(--surface-alt);padding:3px 6px;border-radius:5px;margin-left:7px}
.media-controls{display:flex;align-items:end;justify-content:space-between;gap:20px}.media-controls>.atlas-search{min-width:280px}
.media-video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;align-items:start}
.media-video-grid .learning-video{height:100%}.media-video-grid .learning-video h4{font-size:19px}
.demo-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.external-demos{margin-top:45px}.external-demos .section-heading{margin:0 0 14px}.external-demos h3{font-size:26px}
.demo-card{display:flex;flex-direction:column;padding:25px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.demo-card>.eyebrow{font-size:9px;line-height:1.8}.demo-card h4{font-size:22px;margin:10px 0 12px}.demo-card p{font-size:13px;line-height:1.8;color:var(--ink)}
.demo-task{background:var(--accent-soft);padding:14px 16px;border-radius:8px;margin:17px 0}.demo-task b{font-size:12px}.demo-task p{margin-top:5px}
.demo-card .demo-limit{font-size:11px;color:var(--muted);margin-bottom:18px}.demo-links{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:auto}.demo-links .button{font-size:12px;padding:11px 14px;min-height:38px}.demo-card>small{margin-top:15px;color:var(--muted);font-size:10px}

/* Tabular Q-learning: keyboard-selectable cells and visible numeric values. */
.q-lab{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px;scroll-margin-top:100px}
.q-lab-heading{display:flex;justify-content:space-between;align-items:start;gap:20px;margin-bottom:24px}.q-lab h3{font-size:29px;margin:9px 0}.q-lab-heading p{font-size:13px;color:var(--muted);line-height:1.7}
.lab-badge{font-size:10px;white-space:nowrap;padding:8px 10px;border:1px solid var(--accent-line);border-radius:20px;background:var(--accent-soft);color:var(--green)}
.q-lab-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.8fr);gap:30px}
.q-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;max-width:660px;background:var(--surface-soft);padding:10px;border-radius:11px}
.q-cell{aspect-ratio:1/1;position:relative;min-width:0;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--green);padding:5px}
.q-cell:hover{border-color:var(--green)}.q-cell.selected{outline:2px solid var(--green);outline-offset:-2px}
.q-cell-symbol{font-size:clamp(20px,2.5vw,34px);line-height:1.1}.q-cell small{font-size:9px;margin-top:5px;color:var(--muted)}
.q-cell.wall{background:var(--strong-surface);color:var(--strong-muted);border-color:var(--strong-surface);cursor:default;opacity:.65}
.q-cell.goal{background:color-mix(in srgb,var(--status-good) 14%,var(--surface));color:var(--status-good);border-color:var(--status-good)}
.q-cell.trap{background:color-mix(in srgb,var(--status-warn) 12%,var(--surface));color:var(--status-warn);border-color:var(--status-warn)}
.q-cell.visited:not(.trap):not(.goal){background:var(--accent-soft)}
.q-agent{position:absolute;top:5px;right:7px;font-size:16px;color:var(--ink);filter:drop-shadow(0 0 3px var(--surface))}
.q-legend{display:flex;flex-wrap:wrap;gap:11px;font-size:10px;color:var(--muted);margin:15px 2px}.q-status{font-size:12px;line-height:1.8;border-left:3px solid var(--green);padding:9px 13px;background:var(--accent-soft);min-height:56px}
.q-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:20px}.q-stats small{font-size:10px;color:var(--muted);display:block;line-height:1.6}.q-stats strong{font-size:29px;font-weight:600;display:block;margin-top:4px}
.q-controls>label{display:flex;justify-content:space-between;font-size:12px;font-weight:600}.q-controls input[type="range"]{width:100%;accent-color:var(--green);margin:13px 0 8px}
.q-hint{font-size:11px;line-height:1.6;color:var(--muted);margin-bottom:18px}.q-controls>.button{width:100%;margin:0 0 10px;font-size:12px;justify-content:center;min-height:42px}.q-controls button:disabled{opacity:.5;cursor:wait}
.q-secondary{display:flex;justify-content:space-between;gap:10px;margin:6px 0 23px}.q-secondary button{background:transparent;color:var(--muted);font-size:11px;border:0;padding:5px 0;text-decoration:underline;text-underline-offset:3px}
.q-values{border-top:1px solid var(--line);padding-top:17px}.q-values h4{font-size:13px}.q-values>p{font-size:10px;color:var(--muted);margin:7px 0 10px;line-height:1.5}.q-values table{border-collapse:collapse;width:100%;font-size:12px}.q-values td,.q-values th{padding:6px 2px;border-bottom:1px solid var(--line);text-align:left}.q-values td:last-child,.q-values th:last-child{text-align:right;font-variant-numeric:tabular-nums}.q-values th{font-size:10px;color:var(--muted);font-weight:500}
.q-explanation{border-top:1px solid var(--line);margin-top:24px;padding-top:17px}.q-explanation summary{font-size:13px;font-weight:600;cursor:pointer}.q-explanation p{font-size:12px;line-height:1.8;margin:14px 0;color:var(--muted)}.q-equation{padding:18px 20px;background:var(--surface-soft);border-radius:8px;font-size:16px;line-height:1.8;overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,monospace}.q-explanation a{font-size:12px;color:var(--green)}

/* Software ecosystem, hardware picker and platform detail. */
.platforms-page .page-heading{max-width:900px}.lerobot-intro{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:36px;padding:30px;background:var(--surface);border:1px solid var(--line);border-radius:14px;align-items:start}
.lerobot-intro h2{font-size:30px;margin:10px 0 13px}.lerobot-intro p{font-size:13px;line-height:1.8}.lerobot-intro .text-link{font-size:12px;margin-top:14px}
.lerobot-workflow{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0}.lerobot-workflow>div{padding:13px 15px;background:var(--surface-soft);border-radius:8px}.lerobot-workflow span{font-size:10px;color:var(--green)}.lerobot-workflow h3{font-size:13px;margin:6px 0}.lerobot-workflow p{font-size:11px;color:var(--muted);line-height:1.65}
.platform-section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin:40px 0 23px}.platform-section-heading h2{font-size:30px;margin:9px 0}.platform-section-heading p{font-size:13px;color:var(--muted);line-height:1.8;max-width:760px}.platform-section-heading>a{font-size:12px;white-space:nowrap}
.platform-controls{display:flex;align-items:end;gap:20px;flex-wrap:wrap;margin-bottom:19px}.platform-controls .atlas-search:first-child{flex:1;max-width:420px}.platform-controls select{border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);min-height:42px;padding:10px 35px 10px 12px;font:inherit;font-size:12px}.platform-controls>span{font-size:11px;color:var(--muted);padding-bottom:12px;margin-left:auto}
.platform-picker{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;margin-bottom:26px}
.platform-pick{display:block;position:relative;border:1px solid var(--line);border-radius:10px;padding:18px;text-decoration:none;background:var(--surface);color:var(--ink)}
.platform-pick>span{font-size:9px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.platform-pick h3{font-size:18px;margin:9px 0 7px;line-height:1.35;padding-right:16px}.platform-pick>small{font-size:10px;color:var(--muted);line-height:1.5;display:block}.platform-pick>b{position:absolute;right:15px;top:17px;color:var(--green)}
.platform-pick:hover{background:var(--accent-soft);border-color:var(--accent-line)}.platform-pick[aria-current="page"]{background:var(--green);color:var(--on-accent);border-color:var(--green)}.platform-pick[aria-current="page"] :is(span,small,b){color:var(--on-accent);opacity:.9}
.platform-detail{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:30px;scroll-margin-top:95px}.platform-detail-heading{display:flex;align-items:start;justify-content:space-between;gap:30px;border-bottom:1px solid var(--line);padding-bottom:23px;margin-bottom:24px}.platform-detail-heading h2{font-size:34px;margin:9px 0 12px}.platform-detail-heading p{font-size:14px;line-height:1.8;max-width:720px}.platform-status{font-size:11px;color:var(--muted);background:var(--surface-soft);padding:12px 14px;border:1px solid var(--line);border-radius:8px;max-width:270px;line-height:1.7;flex-shrink:0}
.platform-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:34px;align-items:start}.platform-detail-grid section{margin:23px 0}.platform-detail-grid h3{font-size:17px;margin-bottom:9px}.platform-detail-grid p{font-size:13px;line-height:1.8}.platform-control{background:var(--surface-soft);border-left:3px solid var(--accent-line);padding:17px 19px}.platform-specs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.platform-specs>div{padding:12px 14px;border:1px solid var(--line);border-radius:8px}.platform-specs dt{font-size:10px;color:var(--muted);margin-bottom:5px}.platform-specs dd{font-size:12px;line-height:1.6;margin:0;font-weight:500}
.platform-media>.learning-video+.learning-video{margin-top:20px}.platform-source-intro{margin:0 0 15px;padding:20px;background:var(--accent-soft);border-radius:10px}.platform-source-intro h3{margin:10px 0}.platform-media .paper-card{margin-bottom:14px}
.platform-sandbox{padding:20px;background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:10px;margin-bottom:20px}.platform-sandbox h3{margin:10px 0}.platform-sandbox>.button{font-size:12px;margin:15px 0 4px}.platform-sandbox>p:last-child{margin-top:8px}
.platform-sources{border-top:1px solid var(--line);padding-top:20px;margin-top:27px}.platform-sources summary{font-size:13px;font-weight:600;cursor:pointer}.platform-sources .source-card-list{margin-top:18px}.platform-context{margin:30px 0 20px;padding:25px 30px;background:var(--accent-soft);border-radius:12px}.platform-context h3{font-size:21px;margin-bottom:12px}.platform-context p{font-size:13px;line-height:1.8;max-width:1000px}.platform-context a{display:inline-block;font-size:12px;margin-top:14px;color:var(--green)}

@media(max-width:1100px){.header-actions .edition{display:none}.site-header{gap:16px}.site-header nav{gap:2px}.site-header nav a{padding-left:9px;padding-right:9px}.lerobot-intro{gap:24px;padding:24px}.platform-status{max-width:220px}.platform-picker{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:850px){.learning-shortcuts{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.learning-shortcuts a{padding:13px}.learning-shortcuts b{font-size:11px}.media-controls{display:block}.media-controls .source-kind-filters{margin-top:15px}.media-controls>.atlas-search{min-width:0}.lerobot-intro,.platform-detail-grid{grid-template-columns:1fr}.lerobot-intro>div:last-child:empty{display:none}.lerobot-intro .learning-video{max-width:720px}.platform-section-heading{display:block}.platform-section-heading>a{margin-top:12px;display:inline-block}.q-lab-layout{grid-template-columns:1fr}.q-controls{display:grid;grid-template-columns:1fr 1fr;column-gap:20px}.q-controls>:not(.button){grid-column:1/-1}.q-grid{max-width:none}.q-stats{max-width:400px}.q-values table{max-width:400px}}
@media(max-width:600px){.learning-shortcuts{grid-template-columns:1fr}.learning-shortcuts a{display:flex;align-items:center;justify-content:space-between;gap:12px}.learning-shortcuts span{margin:0;font-size:10px}.history-stage-buttons{grid-template-columns:repeat(2,minmax(0,1fr))}.history-tour-heading{align-items:start}.history-tour-heading a{font-size:10px}#history-stage-detail{padding:16px}.media-heading h2{font-size:28px}.media-video-grid,.demo-grid{grid-template-columns:1fr}.q-lab{padding:17px}.q-lab-heading{display:block}.q-lab h3{font-size:25px}.lab-badge{display:inline-block;margin-top:12px}.q-grid{gap:4px;padding:6px}.q-cell-symbol{font-size:25px}.q-cell small{font-size:8px}.q-agent{font-size:12px;right:4px}.q-lab-layout{gap:18px}.q-equation{font-size:12px;padding:12px}.platform-picker{grid-template-columns:repeat(2,minmax(0,1fr))}.platform-pick{padding:13px}.platform-pick h3{font-size:15px}.platform-detail{padding:18px}.platform-detail-heading{display:block}.platform-detail-heading h2{font-size:28px}.platform-status{display:block;max-width:none;margin-top:15px}.platform-controls{gap:12px}.platform-controls .atlas-search:first-child{max-width:none;flex-basis:100%}.lerobot-intro{padding:19px}.lerobot-intro h2{font-size:25px}.lerobot-workflow{gap:9px}.lerobot-workflow>div{padding:11px}.platform-context{padding:20px}.media-tabs{gap:20px}.media-tabs a{font-size:12px}.q-controls{column-gap:10px}.q-controls>.button{font-size:11px}.q-controls>.q-secondary{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){.learning-shortcuts a{transition:none}}

.platform-photo{margin:0 0 22px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--surface-soft)}
.platform-photo img{display:block;width:100%;height:280px;object-fit:contain;background:#f8f8f6}
.platform-photo figcaption{padding:10px 14px;font-size:10px;line-height:1.6;color:var(--muted)}
.platform-photo a{color:var(--green)}

.inline-video video,.technology-video-container video{display:block;width:100%;height:100%;object-fit:contain;background:#0b1723}
.topic-experiments{margin:28px 0 34px}.topic-experiments>h3{font-size:23px;margin:10px 0 12px}.topic-experiments .demo-grid{gap:14px}.topic-experiments .demo-card{padding:20px}.topic-experiments .demo-card h4{font-size:18px}

.topic-experiments .demo-card:only-child{grid-column:1 / -1}
.demo-steps{margin:10px 0 0;padding-left:21px;font-size:13px;line-height:1.8;color:var(--ink)}.demo-steps li+li{margin-top:8px}