
:root{--bg:#f6f6f6;--paper:#fff;--ink:#202122;--muted:#54595d;--line:#a2a9b1;--rule:#a7d7f9;--link:#2858a5;--accent:#193b53;--tint:#f8f9fa;--teal:#176a6c;--focus:#a14c00;--font-body:"Segoe UI",Tahoma,sans-serif;--font-title:Georgia,"Times New Roman",serif;--space:24px;--radius:2px}
*{box-sizing:border-box}html{scroll-padding-top:20px;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 var(--font-body)}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:4px}button,input{font:inherit}button{cursor:pointer}img,svg{max-width:100%;height:auto}p{margin:0 0 1.05em;text-wrap:pretty}strong{font-weight:650}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip{position:absolute;left:16px;top:-90px;z-index:10;background:white;padding:10px}.skip:focus{top:10px}.site-header{max-width:1264px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 32px}.identity{display:flex;gap:12px;align-items:center;color:var(--accent)}.identity:hover{text-decoration:none}.identity svg{width:42px;height:42px;flex:none}.wordmark{font-size:19px;font-weight:650;letter-spacing:-.4px;line-height:1.25}.wordmark small{display:block;color:var(--muted);font-size:11px;font-weight:500;letter-spacing:1.8px;text-transform:uppercase;margin-top:5px}.search{position:relative;display:flex;width:330px;max-width:100%}.search input{width:100%;min-width:0;border:1px solid var(--line);background:var(--paper);padding:9px 11px;border-radius:var(--radius) 0 0 var(--radius);font-size:14px}.search button{background:var(--tint);border:1px solid var(--line);border-left:0;padding:9px 13px;font-size:14px;color:var(--ink)}.search-panel{position:absolute;z-index:5;top:100%;left:0;right:0;background:white;border:1px solid var(--line);box-shadow:0 8px 18px #20212220;padding:14px;max-height:380px;overflow:auto;font-size:14px}.search-panel ul{padding-left:18px;margin:0}.search-panel a{display:block;padding:7px 0}.search-panel button{border:1px solid var(--line);margin-top:12px}.search-panel p{font-size:13px}.page{max-width:1200px;margin:auto;background:var(--paper);border:1px solid var(--rule);padding:18px 36px 36px;min-height:90vh}.toolbar{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:12px;margin-bottom:24px;font-size:14px}.toolbar nav{display:flex;flex-wrap:wrap;gap:3px}.toolbar a{padding:10px 14px;display:block;color:var(--muted);border:1px solid transparent;border-bottom:0}.toolbar a[aria-current]{border-color:var(--line);color:var(--ink);background:white;position:relative;bottom:-1px}.print{border:0;background:transparent;color:var(--link);padding:10px 5px;white-space:nowrap;font-size:14px}.eyebrow{font:600 11px/1.6 var(--font-body);letter-spacing:1.7px;text-transform:uppercase;color:var(--teal);margin-bottom:10px}.article-heading h1{font:normal clamp(30px,3.6vw,43px)/1.16 var(--font-title);margin:0 0 9px;border-bottom:1px solid var(--line);padding-bottom:12px;letter-spacing:-.7px;text-wrap:balance}.deck{color:var(--muted);font-size:17px;margin:0 0 12px}.metadata{display:flex;flex-wrap:wrap;gap:6px 20px;color:var(--muted);font-size:12px;margin-bottom:24px}.intro{font-size:16px}.infobox{float:right;clear:right;width:304px;margin:0 0 24px 30px;padding:6px;background:var(--tint);border:1px solid var(--line);font-size:13px;line-height:1.5}.infobox-title{font-weight:650;text-align:center;font-size:18px;padding:7px 3px 1px}.infobox-subtitle{text-align:center;color:var(--muted);margin-bottom:12px;font-size:12px}.infobox-art{margin:0 7px 10px}.infobox dl{margin:0 8px}.infobox dl div{display:grid;grid-template-columns:96px 1fr;gap:8px;padding:8px 0;border-bottom:1px solid #d9dde1}.infobox dt{font-weight:650}.infobox dd{margin:0}.infobox .note{font-size:11px;color:var(--muted);margin:12px 8px 8px}.reading-note{border-left:3px solid var(--rule);padding:8px 0 8px 14px;margin:20px 0;font-size:14px}.contents{background:var(--tint);border:1px solid var(--line);padding:12px 18px;display:block;max-width:660px;margin:24px 334px 32px 0;font-size:14px;min-width:230px}.contents summary{font-weight:650;cursor:pointer;padding:3px 0;min-height:32px}.contents ol{margin:10px 0 0;padding-left:23px}.contents li{padding:2px 0}.contents a{display:inline-block;padding:3px 0}section.topic-section{clear:both;max-width:100%;padding-top:3px}h2{font:normal clamp(23px,2.5vw,29px)/1.3 var(--font-title);margin:38px 0 15px;border-bottom:1px solid var(--line);padding-bottom:6px;letter-spacing:-.25px;text-wrap:balance}h3{font:650 19px/1.4 var(--font-body);margin:25px 0 10px;text-wrap:balance}.topic-section>p,.support-page p{max-width:93ch}.reference{font-size:11px;line-height:0;vertical-align:super;white-space:nowrap;margin:0 2px}.reference a{padding:3px 1px}.table-scroll{overflow-x:auto;margin:20px 0 24px;border:1px solid var(--line);max-width:100%}table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.55;min-width:620px}caption{text-align:left;font-weight:650;background:var(--tint);padding:11px 15px;border-bottom:1px solid var(--line)}th,td{padding:12px 15px;text-align:left;vertical-align:top;border-bottom:1px solid #d9dde1}thead{background:#eaf0f5;color:var(--accent)}thead th{font-weight:650}tbody th{font-weight:600;min-width:150px}tbody tr:nth-child(even){background:#f8f9fa}tbody tr:last-child>*{border-bottom:0}.table-scroll:focus-visible{outline-offset:1px}.process-figure,.data-figure{margin:26px 0;border:1px solid var(--line);padding:22px;background:var(--tint)}figcaption{margin-bottom:18px;font-size:16px}figcaption strong{display:block;color:var(--accent);font-size:18px}figcaption span{display:block;color:var(--muted);font-size:13px;margin-top:3px}.process{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:0;margin:0;border:1px solid #bdcbd5}.process li{padding:17px 15px;background:white;border-right:1px solid #bdcbd5;font-size:14px;line-height:1.5}.process li:last-child{border:0}.process b{display:block;color:var(--teal);margin-bottom:7px}.process span{display:block}.figure-note{font-size:12px;line-height:1.6;color:var(--muted);margin:15px 0 0}.data-figure img{display:block;width:100%;max-width:860px;margin:auto;background:white}.stat-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:24px 0 14px;border-top:3px solid var(--accent);border-bottom:1px solid var(--line)}.stat-strip>div{padding:22px 20px;border-right:1px solid var(--line);background:var(--tint)}.stat-strip>div:last-child{border-right:0}.stat-strip strong{font:normal 36px/1.2 var(--font-title);display:block;color:var(--accent)}.stat-strip span{display:block;font-size:14px;margin:8px 0}.stat-strip small{font-size:11px;color:var(--muted);display:block}.timeline{list-style:none;margin:25px 0;padding:0}.timeline li{display:grid;grid-template-columns:100px 1fr;gap:22px;border-top:1px solid #d9dde1;padding:18px 0}.timeline-year{font:normal 21px/1.4 var(--font-title);color:var(--teal)}.timeline h3{font-size:17px;margin:0 0 5px}.timeline p{font-size:15px;margin:0;max-width:80ch}.checklist{padding-left:26px;max-width:92ch}.checklist li{margin:12px 0;padding-left:6px}.example{border-left:3px solid var(--teal);background:var(--tint);padding:18px 24px;margin:24px 0}.example h3{margin:0 0 9px}.example p{margin:0}.glossary{display:grid;grid-template-columns:1fr 1fr;gap:0 32px;margin:20px 0}.glossary div{border-top:1px solid #d9dde1;padding:13px 0;font-size:14px}.glossary dt{font-weight:650}.glossary dd{margin:4px 0 0;color:var(--muted)}.catlinks{padding:12px 15px;border:1px solid var(--line);background:var(--tint);margin-top:32px;font-size:13px;clear:both}.article-footer{clear:both;border-top:3px solid var(--rule);margin-top:35px;padding-top:8px}.article-footer h2{font-size:25px;border:0;margin-top:22px}.article-footer>p{font-size:13px;color:var(--muted);max-width:90ch}.references{padding-left:26px;display:grid;grid-template-columns:1fr 1fr;gap:17px 38px;font-size:12px;line-height:1.6}.references li{padding-left:2px;min-width:0;scroll-margin-top:20px}.references li:target{background:#fff1d6;outline:3px solid #fff1d6}.source-url{display:block;overflow-wrap:anywhere;word-break:break-word;font-family:Consolas,monospace;font-size:11px;color:var(--muted);margin-top:5px;user-select:all}.source-note{display:block;color:var(--muted)}.editorial-note{border-top:1px solid #d9dde1;padding-top:16px;margin-top:25px}.endbar{max-width:1200px;padding:20px 32px;margin:auto;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}.endbar p{margin:0}.endbar a{white-space:nowrap}.resource-list{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:25px 0}.resource-list li{padding:21px;border:1px solid var(--line);background:var(--tint)}.resource-list h3{margin:0 0 9px;font-size:18px}.resource-list p{font-size:14px}.resource-list a{font-size:14px;display:inline-block;padding:5px 0}.edition{border:1px solid var(--line);background:var(--tint);padding:22px;margin:25px 0}.edition h3{margin:0 0 10px}.edition p:last-child{margin:0}.compact{font-size:14px}.noscript-note{font-size:12px;color:var(--muted)}
@media(min-width:1500px){.topic-section>p{max-width:90ch}}
@media(max-width:900px){.page{padding:16px 26px 30px}.site-header{padding:18px 26px}.toolbar a{padding:10px}.infobox{width:280px;margin-left:22px}.contents{margin-right:302px}.process{grid-template-columns:1fr 1fr}.process li:nth-child(2){border-right:0}.process li:nth-child(-n+2){border-bottom:1px solid #bdcbd5}.references{gap:16px 26px}}
@media(max-width:650px){body{font-size:16px}.site-header{padding:17px 18px;align-items:flex-start;flex-direction:column;gap:17px}.search{width:100%}.page{border-left:0;border-right:0;padding:14px 18px 24px}.toolbar{align-items:flex-start;gap:6px;margin-bottom:24px}.toolbar nav{gap:0}.toolbar a{padding:9px 10px;font-size:13px}.print{font-size:13px;min-height:42px}.article-heading h1{font-size:32px}.deck{font-size:16px}.metadata{font-size:11px;gap:4px 12px}.infobox{float:none;width:100%;margin:0 0 24px}.infobox-art{max-width:280px;margin:4px auto 12px}.infobox dl div{grid-template-columns:110px 1fr}.infobox .note{font-size:12px}.intro{font-size:16px}.contents{margin:25px 0;max-width:none;min-width:0}.contents summary{min-height:40px;padding:7px 0}.contents a{padding:7px 0;line-height:1.5}.topic-section h2{font-size:25px;margin-top:32px}.topic-section h3{font-size:18px}.stat-strip{grid-template-columns:1fr}.stat-strip>div{border-right:0;border-bottom:1px solid var(--line);padding:16px}.stat-strip>div:last-child{border-bottom:0}.stat-strip strong{font-size:32px}.stat-strip span{margin:4px 0}.process-figure,.data-figure{padding:13px;margin:22px 0}.process{grid-template-columns:1fr 1fr}.process li{padding:13px 10px;font-size:13px}.data-figure img{min-height:0}.timeline li{grid-template-columns:66px 1fr;gap:14px}.timeline-year{font-size:18px}.timeline h3{font-size:16px}.timeline p{font-size:14px}.glossary,.references,.resource-list{grid-template-columns:1fr}.references{gap:18px}.glossary{gap:0}.endbar{padding:18px;align-items:flex-start}.endbar p{max-width:27ch}.resource-list{gap:13px}.resource-list a{padding:9px 0}.source-url{font-size:11px}.example{padding:16px}.table-scroll{margin-right:0}}
@media(max-width:650px){article:not(.support-page){display:flex;flex-direction:column}article>.intro{order:-3}article>.contents{order:-2}article>.infobox{order:-1}.data-figure picture{display:block}.data-figure img{aspect-ratio:360/330}.table-scroll::before{content:"Swipe or use arrow keys to view the full table";display:block;font-size:11px;color:var(--muted);padding:6px 12px;background:var(--tint);position:sticky;left:0;width:100%;max-width:calc(100vw - 38px)}}
html{scroll-behavior:auto}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:white;font-size:11pt;color:#000}.site-header,.toolbar,.contents,.skip,.endbar,.search-panel{display:none!important}.page{max-width:none;border:0;padding:0}.article-heading h1{font-size:27pt}.infobox{width:240px;font-size:9pt}.table-scroll{overflow:visible;border:0}table{min-width:0;font-size:9pt}tr{break-inside:avoid}.data-figure,.process-figure{break-inside:avoid}h2,h3{break-after:avoid}.references{display:block;font-size:9pt}.references li{margin-bottom:9px}.source-url{font-size:8pt}.glossary{display:block}a{color:#000}.metadata{font-size:9pt}.topic-section>p{max-width:none}.stat-strip strong{font-size:25pt}.article-footer{break-before:page}}

.reference{vertical-align:baseline;font-size:13px}.contents a{min-height:40px;display:flex;align-items:center}.topic-section>p{max-width:90ch}.legal p{max-width:85ch}.data-figure img{aspect-ratio:900/440}.footer-nav{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end}.endbar{gap:24px}.wordmark{font-size:20px}.identity small{font-size:9px}.feature-note{padding:12px 16px;background:#f2f7fa;border-left:3px solid #176a6c;font-size:14px}.sitemap-list li{margin:14px 0}.sitemap-list a{font-weight:600}.crumb{margin-bottom:16px;font-size:12px;color:#54595d}.glossary dt{scroll-margin-top:20px}.data-figure img{width:100%;height:auto}.metadata{flex-wrap:wrap}@media(max-width:650px){.data-figure img{aspect-ratio:360/350}.data-figure[data-chart="platform-use"] img{aspect-ratio:360/470}.toolbar{flex-wrap:wrap}.toolbar nav{flex:1;min-width:260px}.print{margin-left:auto}.endbar{display:block}.footer-nav{justify-content:flex-start}.identity{min-width:0}.wordmark{font-size:19px}}
.wordmark{font-size:18px}.wordmark small{letter-spacing:1.2px}.glossary{grid-template-columns:minmax(150px,220px) 1fr;gap:0 24px}.glossary dt,.glossary dd{border-top:1px solid #d9dde1;padding:12px 0;margin:0;font-size:14px}@media(max-width:650px){.wordmark{font-size:18px}.glossary{display:block}.glossary dd{border-top:0;padding-top:0}.glossary dt{padding-bottom:4px}}
