/* Armwrestling LAB. No framework, network fonts or external assets. */
:root{--bg:#faf9f6;--surface:#fff;--soft:#f0eeea;--ink:#171819;--muted:#5c5e60;--line:#deddd8;--red:#c41f2c;--red-soft:#fae9e9;--dark:#141516;--radius:9px;--shadow:0 15px 40px rgba(0,0,0,.08);color-scheme:light;scroll-behavior:smooth;scroll-padding-top:110px}
:root[data-theme=dark]{--bg:#161719;--surface:#1f2123;--soft:#26282b;--ink:#f4f3ef;--muted:#b4b5b7;--line:#383a3e;--red:#ff747a;--red-soft:#342124;--dark:#0f1011;--shadow:0 15px 40px rgba(0,0,0,.2);color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:hover{color:var(--red)}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:default}button,a,summary,input,select{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--red);outline-offset:5px}img{display:block;max-width:100%;height:auto}svg{flex-shrink:0}.icon{width:20px;height:20px;vertical-align:middle;display:inline-block}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:750;line-height:1.13;letter-spacing:-.035em}h1{font-size:clamp(38px,4.4vw,64px)}h2{font-size:34px}h3{font-size:22px}p{margin-bottom:1.2em}button{color:inherit}[hidden]{display:none!important}.shell{width:min(1200px,calc(100% - 80px));margin-inline:auto}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.skip-link{position:fixed;top:-100px;left:18px;z-index:1000;background:var(--surface);padding:12px 20px;border:2px solid var(--red);border-radius:4px}.skip-link:focus{top:10px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:.13em;line-height:1.6;text-transform:uppercase}.red-dash{display:inline-block;width:22px;height:3px;background:var(--red);vertical-align:middle;margin-right:11px}.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;padding:14px 22px;border:1px solid transparent;border-radius:5px;font-size:13px;font-weight:700;line-height:1.4;min-height:48px;transition:background .16s,border-color .16s}.button.primary{background:#c51e2c;color:white;border-color:#c51e2c}.button.primary:hover{background:#a91622;border-color:#a91622;color:white}.button.secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}.button.secondary:hover{border-color:var(--red);color:var(--red)}.button.small{padding:10px 15px;min-height:42px;font-size:12px}.text-link{display:inline-flex;align-items:center;gap:13px;font-size:13px;font-weight:700}.text-link .icon{width:19px}.icon-button{display:inline-flex;align-items:center;justify-content:center;padding:10px;width:42px;height:42px;border:1px solid var(--line);border-radius:5px;background:transparent;flex-shrink:0}.icon-button:hover{background:var(--soft)}
/* Masthead */
.site-header{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:25px;height:80px}.brand{display:flex;align-items:center;gap:11px;flex-shrink:0;line-height:1}.brand img{border-radius:50%;width:44px;height:44px}.brand>span{font-size:11px;font-weight:750;letter-spacing:.075em}.brand b{display:block;margin-top:5px;font-size:22px;letter-spacing:-.04em}.brand-dot{color:var(--red)}.desktop-nav{display:flex;gap:31px;align-items:center}.desktop-nav>a{font-size:13px;font-weight:650;position:relative}.desktop-nav>a[aria-current=page]:after{content:"";position:absolute;bottom:-30px;left:0;right:0;height:2px;background:var(--red)}.header-actions{display:flex;align-items:center;gap:12px}.header-actions details{position:relative}.header-actions summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;height:42px;font-size:12px;font-weight:650}.header-actions summary::-webkit-details-marker{display:none}.language-picker summary{padding:0 7px}.chevron{width:6px;height:6px;border-right:1px solid;border-bottom:1px solid;transform:rotate(45deg);margin-top:-4px}.language-list,.mobile-menu nav{position:absolute;right:0;top:54px;min-width:180px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:6px;padding:7px;z-index:60}.language-list a{display:flex;justify-content:space-between;padding:10px 12px;border-radius:3px;font-size:14px;gap:20px}.language-list a:hover,.language-list a[aria-current=true]{background:var(--soft)}.language-list small{color:var(--muted);font-size:11px}.mobile-menu{display:none}.mobile-menu nav a{display:block;padding:12px 15px;font-size:14px}.mobile-menu summary{width:40px;border:1px solid var(--line);border-radius:5px}
/* Landing editorial */
.hero{background:var(--soft);border-bottom:1px solid var(--line);padding:65px 0 55px}.hero-grid{display:grid;grid-template-columns:1.04fr 1fr;gap:70px;align-items:center}.hero-copy>.eyebrow{margin-bottom:25px}.hero h1{font-size:clamp(39px,5.35vw,76px);line-height:1.035;letter-spacing:-.055em;margin-bottom:24px}.hero h1>span{color:var(--red)}.hero-description{max-width:440px;color:var(--muted);font-size:17px;line-height:1.7;margin-bottom:27px}.hero-buttons{display:flex;gap:27px;align-items:center;flex-wrap:wrap}.hero-stats{display:flex;gap:28px;margin-top:39px;padding-top:26px;border-top:1px solid var(--line)}.hero-stats>div{display:flex;flex-direction:column;max-width:128px}.hero-stats strong{font-size:29px;line-height:1.2;letter-spacing:-.045em}.hero-stats span{font-size:10px;line-height:1.5;letter-spacing:.03em;color:var(--muted);margin-top:7px}.hero-feature{overflow:hidden;border-radius:6px;background:#151617;color:#f7f6f2;box-shadow:var(--shadow);border-top:3px solid #c51e2c}.feature-label{padding:12px 20px;display:flex;justify-content:space-between;font-size:9px;letter-spacing:.15em;color:#c5c4c0}.feature-image{display:block;overflow:hidden;aspect-ratio:16/9}.feature-image img{height:100%;width:100%;object-fit:cover}.feature-copy{padding:21px 24px 24px}.feature-copy .eyebrow{color:#f2767b;font-size:9px}.feature-copy h2{font-size:25px;line-height:1.17;letter-spacing:-.035em;margin:9px 0 17px;max-width:400px}.feature-copy h2 a:hover{color:#ff858a}.feature-copy .text-link{font-size:11px}.feature-copy .text-link:hover{color:#ff858a}
/* Article library */
.library{padding-block:67px 25px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:45px;margin-bottom:26px}.section-heading .eyebrow{color:var(--muted);display:block;margin-bottom:10px}.section-heading h2{margin:0;font-size:35px}.section-heading>p{color:var(--muted);max-width:290px;font-size:13px;line-height:1.6;margin:0 0 2px}.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px;align-items:center}.filter{padding:8px 14px;border:1px solid var(--line);background:transparent;border-radius:4px;font-size:11px;font-weight:600;line-height:1.5;min-height:37px;display:inline-flex;gap:10px;align-items:center;justify-content:center;text-align:center}.filter.active{background:var(--ink);border-color:var(--ink);color:var(--bg)}.filter:hover{border-color:var(--ink)}.filter.active:hover{color:var(--bg)}.filter>span{opacity:.6;font-variant-numeric:tabular-nums}.search-row{display:flex;align-items:center;gap:20px;margin-bottom:8px}.search-field{display:flex;position:relative;align-items:center;gap:13px;flex:1;min-width:0;max-width:570px;background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:0 15px}.search-field>.icon{color:var(--muted);width:18px}.search-field input{width:100%;min-width:0;border:0;background:transparent;outline:none;padding:12px 0;color:var(--ink);font-size:13px}.search-field:focus-within{outline:2px solid var(--red);outline-offset:1px}.search-field input:focus-visible{outline:none}.search-field input::-webkit-search-cancel-button{display:none}.clear-search{border:0;background:none;color:var(--muted);padding:5px;line-height:1;display:flex}.sort-label{font-size:10px;color:var(--muted);display:flex;align-items:center;gap:9px;white-space:nowrap}.sort-label select{border:1px solid var(--line);background:var(--surface);padding:9px 26px 9px 10px;border-radius:4px;color:var(--ink);font-size:11px;max-width:185px}.result-count{margin-left:auto;white-space:nowrap;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.search-hint{color:var(--muted);font-size:10px;margin-bottom:22px}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 24px}.article-card{background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .17s,transform .17s}.article-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.card-image{aspect-ratio:16/9;overflow:hidden;display:block;background:var(--soft)}.card-image img{width:100%;height:100%;object-fit:cover}.card-body{display:flex;flex-direction:column;flex:1;padding:20px 20px 17px}.card-kicker{display:flex;align-items:baseline;gap:14px;justify-content:space-between;font-size:9px;line-height:1.4;color:var(--muted);margin-bottom:12px}.card-kicker>a{font-weight:700;color:var(--red);letter-spacing:.02em}.card-kicker>span{white-space:nowrap}.article-card h3{font-size:21px;line-height:1.2;letter-spacing:-.025em;margin-bottom:11px}.card-body>p{font-size:12px;line-height:1.7;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:20px}.card-bottom{padding-top:14px;margin-top:auto;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:10px;line-height:1.4}.card-bottom>span{color:var(--muted)}.card-bottom>a{display:flex;align-items:center;gap:8px;font-weight:650}.card-bottom .icon{width:16px}.empty-state{padding:55px 20px 65px;border:1px dashed var(--line);border-radius:6px;text-align:center;grid-column:1/-1}.empty-state h2,.empty-state h3{font-size:24px;margin-bottom:17px}.empty-state p{font-size:14px;color:var(--muted)}.empty-number{font-size:60px;font-weight:700;line-height:1.1;color:var(--muted);display:block;margin-bottom:20px}.download-banner{margin-top:56px;margin-bottom:78px;padding:37px 40px;background:var(--soft);border-left:3px solid var(--red);display:flex;justify-content:space-between;align-items:center;gap:40px;border-radius:0 5px 5px 0}.download-banner h2{font-size:32px;margin:9px 0 12px}.download-banner p{color:var(--muted);font-size:13px;margin:0;max-width:640px}.download-banner>.button{flex-shrink:0}
/* Inner-page intro */
.page-header{padding-top:65px;padding-bottom:30px}.page-header h1{max-width:950px;margin-bottom:22px}.page-header .eyebrow{color:var(--red);margin-bottom:15px}.lead{font-size:19px;color:var(--muted);line-height:1.7;max-width:750px;margin-bottom:10px}.back-link{display:inline-flex;font-size:12px;margin-bottom:27px;color:var(--muted)}[data-kind=topic] .library{padding-top:15px;padding-bottom:75px}
/* Article */
.article-header{padding-top:36px;padding-bottom:48px;border-bottom:1px solid var(--line)}.breadcrumb{font-size:11px;color:var(--muted);display:flex;flex-wrap:wrap;gap:12px;margin-bottom:33px}.article-heading-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:55px;align-items:center}.article-heading-grid>.article-video{min-width:0}.article-header .eyebrow{color:var(--red);display:block;margin-bottom:15px}.article-header h1{font-size:clamp(35px,3.25vw,48px);line-height:1.09;letter-spacing:-.045em;margin-bottom:23px}.article-summary{font-size:17px;line-height:1.65;color:var(--muted);margin-bottom:22px}.byline{display:flex;align-items:center;gap:11px;font-size:11px}.byline img{border-radius:50%;width:32px;height:32px}.byline div{display:flex;flex-direction:column;gap:2px}.byline strong{font-weight:600}.byline span{color:var(--muted);font-size:10px}.video-cover{display:block;position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:5px;background:var(--dark)}.video-cover img{width:100%;height:100%;object-fit:cover}.play-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:58px;height:58px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(197,30,44,.94);color:white;box-shadow:0 2px 15px #0006}.play-badge .icon{width:27px;height:27px}.video-link{font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:15px}.video-link .icon{width:16px}.article-video>p{font-size:10px;color:var(--muted);line-height:1.6;margin:9px 0 0}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(180px,250px);gap:80px;padding-top:43px;justify-content:space-between;align-items:start}.article-content{min-width:0}.article-content p{font-size:16px;line-height:1.88}.takeaway{background:var(--soft);border-left:3px solid var(--red);padding:23px 26px;margin-bottom:40px;border-radius:0 4px 4px 0}.takeaway .eyebrow{color:var(--red);display:block;margin-bottom:10px}.takeaway p{font-size:17px;font-weight:600;line-height:1.65;margin:0;letter-spacing:-.012em}.prose-section{margin-bottom:35px}.prose-section h2{font-size:27px;line-height:1.22;margin-bottom:17px;letter-spacing:-.025em}.prose-section p:last-child{margin-bottom:0}.citations{font-size:11px;white-space:nowrap;vertical-align:super;color:var(--red);line-height:0}.citations a{font-weight:700;text-decoration:underline;text-underline-offset:2px}.article-sidebar{position:sticky;top:115px}.toc>.eyebrow{display:block;color:var(--muted);margin-bottom:17px}.toc a{display:flex;gap:11px;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--line);font-size:12px;line-height:1.6}.toc a>span{font-size:10px;color:var(--muted);flex-shrink:0;min-width:15px}.toc a[aria-current=true]{color:var(--red)}.sidebar-tools{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}.quiet-button{font-size:11px;background:transparent;border:1px solid var(--line);padding:8px 11px;border-radius:4px}.quiet-button:hover{border-color:var(--red)}.sidebar-note{font-size:11px;color:var(--muted);line-height:1.65;margin-top:21px}.limitations{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:27px 0;margin:40px 0}.limitations h2{font-size:21px;margin-bottom:13px}.limitations p{font-size:14px;color:var(--muted);margin-bottom:0;line-height:1.8}.article-materials{margin:35px 0}.article-materials h2,.references h2{font-size:26px;margin-bottom:17px}.material-link{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:4px;padding:15px 17px;margin-bottom:9px;background:var(--surface)}.material-link>span{flex:1;font-size:13px;font-weight:600}.material-link small{display:block;color:var(--muted);font-size:10px;font-weight:400;margin-top:3px}.material-link>.icon{color:var(--red)}.references{margin-top:43px;padding-bottom:35px;scroll-margin-top:110px}.references ol{padding-left:23px}.references li{padding:9px 0 12px 5px;font-size:12px;line-height:1.8;overflow-wrap:anywhere;scroll-margin-top:115px}.references li::marker{color:var(--red);font-weight:700}.references li:target{background:var(--red-soft)}.references li>a{font-weight:600;text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line)}.references .journal{color:var(--muted)}.article-content .source-note{color:var(--muted);font-size:12px;line-height:1.65}.related{border-top:1px solid var(--line);margin-top:10px;padding-top:48px;padding-bottom:72px}.related .section-heading h2{font-size:29px}
/* Figures: data-first, accessible HTML; no external chart libraries. */
.evidence-figure{margin:34px 0 39px;padding:24px 25px 20px;border:1px solid var(--line);border-radius:5px;background:var(--surface);min-width:0}.figure-kicker{display:flex;align-items:center;justify-content:space-between;gap:18px;font-size:9px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}.figure-kicker>span:first-child{color:var(--red);font-weight:750}.evidence-figure h3{font-size:23px;line-height:1.22;margin-bottom:23px}.figure-visual{padding-bottom:15px}.evidence-figure figcaption{font-size:11px;line-height:1.75;color:var(--muted);padding-top:15px;border-top:1px solid var(--line)}.figure-links{display:flex;gap:8px 19px;flex-wrap:wrap;margin-top:15px;font-size:10px;color:var(--red)}.figure-links a{text-decoration:underline;text-underline-offset:3px}.figure-links .icon{width:13px;height:13px}.chart-legend{display:flex;flex-wrap:wrap;gap:20px;margin-bottom:19px}.chart-legend>span{display:flex;align-items:center;gap:7px;font-size:11px}.swatch{width:10px;height:10px;display:inline-block;border-radius:2px}.s0{background:var(--red)}.s1{background:#797e84}.bar-group{margin-bottom:19px}.bar-group>strong{font-size:12px;font-weight:600;display:block;margin-bottom:7px}.bar-row{display:flex;align-items:center;gap:12px;margin:6px 0}.bar-track{flex:1;height:18px;background:var(--soft);border-left:1px solid var(--line);position:relative}.bar{display:block;height:100%;border-radius:0 2px 2px 0}.bar-row>b{font-variant-numeric:tabular-nums;font-size:12px;width:45px;text-align:right}.axis-note{font-size:10px;color:var(--muted);text-align:right}.interval-row{padding:12px 0 20px}.interval-row>div:first-child{display:flex;justify-content:space-between;gap:15px;margin-bottom:18px;font-size:12px}.interval-row strong{font-weight:600}.interval-row small{color:var(--muted);font-size:11px}.interval-row>div>span{font-variant-numeric:tabular-nums}.interval-track{position:relative;height:13px;background:linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0 / 20% 100%}.interval-track:before{content:"";position:absolute;left:0;right:0;top:6px;border-top:1px solid var(--line)}.ci-line{position:absolute;top:5px;height:3px;background:var(--red)}.ci-line:before,.ci-line:after{content:"";position:absolute;top:-4px;width:2px;height:11px;background:var(--red)}.ci-line:before{left:0}.ci-line:after{right:0}.ci-dot{position:absolute;top:1px;width:11px;height:11px;background:var(--red);border-radius:50%;transform:translateX(-50%)}.interval-axis{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);padding-top:0}.table-scroll{overflow:auto;max-width:100%;border:1px solid var(--line);border-radius:4px}.table-scroll table{border-collapse:collapse;width:100%;min-width:300px;font-size:12px;line-height:1.6;text-align:left;font-variant-numeric:tabular-nums}.table-scroll th,.table-scroll td{padding:11px 13px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}.table-scroll thead th{font-weight:600;background:var(--soft);font-size:11px}.table-scroll tbody th{font-weight:600}.table-scroll tbody tr:last-child>*{border-bottom:0}.data-table{margin-top:14px}.data-table summary{font-size:11px;color:var(--red);cursor:pointer;padding:7px 0}.data-table>.table-scroll{margin-top:7px}.article-content .formula{font:11px/1.7 ui-monospace,Consolas,monospace;color:var(--muted);margin-top:13px;overflow-wrap:anywhere;margin-bottom:0}.concept-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.concept-item{background:var(--soft);padding:17px;border-radius:4px}.concept-index{display:block;color:var(--red);font-size:10px;margin-bottom:10px;letter-spacing:.08em;font-weight:700}.concept-item strong{font-size:14px;line-height:1.4;display:block;margin-bottom:6px}.article-content .concept-item p{font-size:11px;line-height:1.7;color:var(--muted);margin:0}.number-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.number-grid>div{padding:14px 5px 19px;border-bottom:2px solid var(--line);min-width:0}.number-grid>div:last-child{border-color:var(--red)}.number-grid strong{display:block;font-size:32px;line-height:1.25;letter-spacing:-.04em}.number-grid strong small{font-size:13px;font-weight:500}.number-grid>div>span{display:block;font-size:11px;color:var(--muted);line-height:1.6;margin-top:9px}
/* Downloads and editorial pages */
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/* Footer and ancillary UI */
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@media(max-width:1100px){.shell{width:calc(100% - 56px)}.hero-grid{gap:40px}.hero{padding-top:50px;padding-bottom:45px}.hero-stats{gap:20px}.hero-description{font-size:16px}.article-layout{gap:45px;grid-template-columns:minmax(0,1fr) 215px}.article-heading-grid{gap:35px}.desktop-nav{gap:22px}.header-inner{gap:20px}.article-card h3{font-size:19px}.card-body{padding:17px}.card-kicker{font-size:8.5px;gap:8px}.footer-main{gap:40px}.download-card{padding:20px}.download-card h2{font-size:20px}}
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/* A native mobile contents menu preserves article navigation on small screens. */
.mobile-toc{display:none}
@media(max-width:850px){
 .mobile-toc{display:block;border:1px solid var(--line);border-radius:4px;margin:0 0 24px;padding:16px 18px}
 .mobile-toc summary{font-size:14px;font-weight:700;cursor:pointer}
 .mobile-toc nav{display:grid;padding-top:14px;gap:0}
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 .mobile-toc .sidebar-tools{padding-top:12px;margin-top:4px}
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@media print{.mobile-toc{display:none!important}}