:root{color-scheme:light;--ink:#1d2829;--muted:#526367;--line:#d8e0de;--paper:#fff;--wash:#f2f5f4;--accent:#08685d;--accent-light:#dff0e9;--orange:#b14a22;--dark:#172b29}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.65;letter-spacing:0}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}img{display:block;max-width:100%;height:auto}h1,h2,h3,p,figure{margin:0}h1,h2,h3{line-height:1.18;letter-spacing:0}h1{font-size:46px;font-weight:650}h2{font-size:30px;font-weight:600}h3{font-size:21px;font-weight:600}p+p{margin-top:16px}ul,ol{padding-left:24px}li+li{margin-top:8px}code,.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}code{font-size:.89em;overflow-wrap:anywhere}strong{font-weight:650}.wrap{width:min(1180px,calc(100% - 80px));margin-inline:auto}.skip{position:absolute;left:20px;top:-100px;z-index:10;background:white;padding:12px}.skip:focus{top:12px}.site-header{border-bottom:1px solid var(--line);background:var(--paper)}.header-inner{min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink);font-size:23px;font-weight:700;text-decoration:none;flex-shrink:0}.brand img{width:30px;height:30px}.nav{display:flex;gap:28px;align-items:center}.nav a{color:var(--muted);font-size:14px;text-decoration:none;padding-block:9px;border-bottom:2px solid transparent}.nav a:hover,.nav a[aria-current]{color:var(--accent);border-color:var(--accent)}.mobile-nav{display:none}.eyebrow{font:12px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;text-transform:uppercase;letter-spacing:0;color:var(--accent);display:flex;align-items:center;gap:10px}.eyebrow::before{content:'';width:7px;height:7px;background:var(--accent);flex-shrink:0}.hero{padding:64px 0 44px;border-bottom:1px solid var(--line)}.hero h1{font-size:66px;margin-top:22px}.hero .tagline{font-size:38px;line-height:1.2;max-width:800px;margin-top:15px}.hero .lede{max-width:670px;margin-top:22px;font-size:19px;color:var(--muted)}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:22px;margin-top:30px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 21px;border:1px solid var(--accent);background:var(--accent);color:white;text-decoration:none;border-radius:4px;font-size:14px;font-weight:600}.button:hover{background:#064e46}.text-link{font-size:14px;font-weight:600}.hero-note{margin-top:36px;display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font:12px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace}.hero-note span+span{border-left:1px solid var(--line);padding-left:18px}.section{padding:54px 0}.section+.section{border-top:1px solid var(--line)}.section-title{display:flex;justify-content:space-between;gap:24px;align-items:baseline;margin-bottom:28px}.section-title .eyebrow{margin-bottom:12px}.section-title p{max-width:390px;color:var(--muted);font-size:14px}.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.topic-card{border:1px solid var(--line);padding:27px;border-radius:4px;display:flex;flex-direction:column;align-items:flex-start;gap:17px;background:#fff}.topic-card .number{font:13px/1.5 ui-monospace,monospace;color:var(--orange)}.topic-card p{font-size:15px;color:var(--muted)}.topic-card a{margin-top:auto;font-size:14px;font-weight:600}.diagram-section{background:var(--wash)}.diagram{margin:28px auto 0;max-width:960px}.diagram img{width:100%}.diagram-mobile{display:none}.diagram figcaption{color:var(--muted);font-size:13px;margin-top:20px;max-width:850px}.standards-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.standard{border-top:2px solid var(--accent);padding:24px 0}.standard .eyebrow{margin-bottom:12px}.standard p{margin:14px 0 20px;color:var(--muted);max-width:520px}.standard .links{display:flex;gap:24px;flex-wrap:wrap;font-size:14px}.feature{background:var(--dark);color:#fff}.feature .eyebrow{color:#9fdac4}.feature .eyebrow::before{background:#9fdac4}.feature h2{font-size:36px;max-width:800px;margin:20px 0}.feature p{color:#d0dfd8;max-width:700px}.feature .button{background:#b8e5ca;color:#18372b;border-color:#b8e5ca;margin-top:26px}.feature .button:hover{background:#d8f3e3}.feature .meta{font-size:13px;margin-top:25px;color:#d0dfd8}.site-footer{padding:38px 0 25px;border-top:1px solid var(--line);background:var(--wash)}.footer-top{display:flex;justify-content:space-between;gap:24px}.footer-top p{font-size:14px;margin-top:12px;color:var(--muted)}.footer-links{display:flex;gap:25px;flex-wrap:wrap;font-size:14px;align-items:flex-start;padding-top:8px}.footer-bottom{border-top:1px solid var(--line);margin-top:28px;padding-top:20px;display:flex;justify-content:space-between;gap:24px;font-size:12px;color:var(--muted)}.page-head{padding:45px 0 35px;border-bottom:1px solid var(--line)}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:25px;display:flex;flex-wrap:wrap;gap:10px}.page-head h1{max-width:900px;margin-top:17px}.page-head .lede{max-width:790px;font-size:19px;color:var(--muted);margin-top:21px}.meta{font:12px/1.6 ui-monospace,monospace;color:var(--muted);margin-top:20px}.article-layout{display:grid;grid-template-columns:210px minmax(0,790px);gap:62px;align-items:start;padding-block:45px 70px}.toc{position:sticky;top:24px;font-size:13px;border-left:2px solid var(--line);padding-left:19px}.toc p{font-weight:700;margin-bottom:14px}.toc a{display:block;padding:6px 0;text-decoration:none;color:var(--muted)}.toc a:hover{color:var(--accent);text-decoration:underline}.prose{min-width:0}.prose h2{font-size:27px;margin:40px 0 17px;scroll-margin-top:24px}.prose h2:first-child{margin-top:0}.prose h3{font-size:20px;margin:27px 0 12px}.prose p,.prose li{max-width:760px}.prose .source{font-size:13px;color:var(--muted);margin-top:12px}.prose .source a{font-size:13px}.note{border-left:3px solid var(--orange);background:#faf4ef;padding:19px 23px;margin:25px 0;font-size:15px}.note p+p{margin-top:8px}.table-scroll{max-width:100%;overflow-x:auto;margin:24px 0;border:1px solid var(--line)}table{border-collapse:collapse;width:100%;font-size:14px;min-width:540px;text-align:left}caption{text-align:left;padding:15px 18px;font-size:13px;background:var(--wash)}th,td{padding:15px 18px;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--wash);font-size:13px}tr:last-child td{border-bottom:0}td:first-child{font-weight:600}pre{padding:20px;background:var(--dark);color:#e5f2eb;overflow:auto;border-radius:4px;font-size:14px;line-height:1.6}pre code{font-size:inherit}.reading{max-width:800px;padding:44px 0 65px}.resource-list{list-style:none;padding:0;margin:24px 0}.resource-list li{padding:22px 0;border-top:1px solid var(--line);margin:0}.resource-list li:last-child{border-bottom:1px solid var(--line)}.resource-list h3{font-size:19px;margin:0 0 9px}.resource-list p{font-size:15px;color:var(--muted)}.resource-list small{font-size:12px;color:var(--muted)}.two-column{display:grid;grid-template-columns:1fr 1fr;gap:40px}.scope-line{font-size:13px;color:var(--muted);margin-top:22px}.article-next{margin-top:38px;padding-top:23px;border-top:1px solid var(--line);display:flex;gap:25px;flex-wrap:wrap}.standard-summary{padding:34px 0;border-bottom:1px solid var(--line)}.standard-summary:first-child{padding-top:0}.standard-summary h2{margin-top:10px}.standard-summary p{margin-top:17px}.flow{margin-block:27px;display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.flow div{border-top:3px solid var(--accent);padding:16px 0;font-size:14px}.flow strong{display:block;font-size:16px;margin-bottom:8px}
.table-scroll code{white-space:nowrap}
@media(min-width:1500px){.hero{padding-top:76px;padding-bottom:52px}}
@media(max-width:950px){.wrap{width:calc(100% - 48px)}.nav{gap:17px}.article-layout{grid-template-columns:170px minmax(0,1fr);gap:30px}.topic-card{padding:22px}.hero h1{font-size:58px}.hero .tagline{font-size:34px}}
@media(max-width:700px){.wrap{width:calc(100% - 40px)}.header-inner{min-height:74px}.desktop-nav{display:none}.mobile-nav{display:block}.mobile-nav summary{cursor:pointer;color:var(--accent);font-size:14px;padding:9px 0}.mobile-nav .nav{position:absolute;left:0;right:0;top:74px;background:#fff;border-bottom:1px solid var(--line);z-index:5;display:flex;flex-direction:column;align-items:stretch;gap:0;padding:14px 24px;box-shadow:0 8px 15px #0000000d}.mobile-nav a{padding:12px 0}.hero{padding:40px 0 32px}.hero h1{font-size:48px;margin-top:18px}.hero .tagline{font-size:29px;max-width:450px}.hero .lede{font-size:17px;margin-top:18px}.actions{gap:18px;margin-top:24px}.hero-note{margin-top:28px;gap:12px;font-size:11px}.hero-note span+span{padding-left:12px}.section{padding:38px 0}.section-title{display:block;margin-bottom:24px}.section-title p{margin-top:15px}.grid-three,.standards-grid,.two-column{grid-template-columns:1fr;gap:20px}.topic-card{gap:13px}.topic-card p{max-width:500px}.topic-card{padding:23px}.diagram-desktop{display:none}.diagram-mobile{display:block}.diagram{margin-top:20px}.feature h2{font-size:29px}.footer-top,.footer-bottom{flex-direction:column;gap:18px}.footer-links{gap:22px}.page-head{padding:28px 0}.page-head h1{font-size:33px}.page-head .lede{font-size:17px}.article-layout{display:block;padding-block:26px 45px}.toc{position:static;margin-bottom:34px;padding-left:16px}.toc nav{display:grid;grid-template-columns:1fr 1fr;gap:2px 16px}.prose h2{font-size:25px;margin-top:32px}.flow{grid-template-columns:1fr;gap:3px}.reading{padding:30px 0 45px}h2{font-size:27px}.note{padding:17px 18px}.standard-summary{padding:28px 0}}
@media(prefers-reduced-motion:no-preference){a{transition:color .12s,background-color .12s}}
@media print{.site-header,.site-footer,.toc,.actions,.article-next{display:none}.wrap{width:100%}.article-layout{display:block}.page-head,.section{padding:20px 0}.feature{color:#111;background:white}.feature p{color:#333}a{color:#111}h2,h3{break-after:avoid}table,figure{break-inside:avoid}}

.explorer-head{padding:28px 0 22px;border-bottom:1px solid var(--line)}.explorer-head .breadcrumbs{margin-bottom:18px}.explorer-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.explorer-heading h1{font-size:34px;margin-top:10px}.explorer-intro{margin-top:13px;font-size:14px;color:var(--muted)}.explorer-intro span{margin:0 9px}.local-badge{display:flex;align-items:center;gap:8px;color:var(--accent);font-size:13px}.local-badge svg{width:18px;height:18px}.explorer-wrap{padding-block:24px 48px}.schema-warning{border:1px solid #dcc779;border-left:4px solid #9b7512;background:#fff8d9;border-radius:4px;padding:17px 20px;color:#4e3b0b}.schema-warning strong{font-size:15px}.schema-warning p{margin-top:5px;font-size:13px;line-height:1.6;max-width:1050px}.explorer-toolbar{display:flex;align-items:flex-end;gap:16px;padding:24px 0 18px}.message-field{display:flex;flex-direction:column;gap:6px;min-width:0}.message-field label{font-size:12px;font-weight:600}.message-field select{min-width:205px;height:42px;border:1px solid #a7b7b2;border-radius:4px;background:#fff;color:var(--ink);padding:0 36px 0 12px;font:14px ui-monospace,monospace}.toolbar-spacer{flex:1}.explorer-toolbar .button{min-height:42px;gap:8px}.explorer-wrap button{font-family:inherit;cursor:pointer}.explorer-wrap button:disabled{cursor:not-allowed;opacity:.45}.explorer-wrap button:focus-visible,.explorer-wrap select:focus-visible,.icon-button:focus-visible{outline:3px solid var(--orange);outline-offset:3px}.explorer-wrap .button{font-size:14px}.secondary-command{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 13px;background:#fff;color:var(--ink);border:1px solid #a7b7b2;border-radius:4px;font-size:13px}.secondary-command:hover{background:var(--wash)}.explorer-wrap button svg{width:17px;height:17px;flex-shrink:0}.explorer-panels{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);border:1px solid var(--line);border-radius:4px;overflow:hidden;background:#fff}.editor-panel,.result-panel{min-width:0;display:flex;flex-direction:column}.editor-panel{border-right:1px solid var(--line)}.panel-heading{display:flex;justify-content:space-between;align-items:center;min-height:56px;padding:8px 16px;border-bottom:1px solid var(--line);gap:10px;background:var(--wash)}.panel-heading h2{font-size:15px;font-weight:600;white-space:nowrap}.editor-tools{display:flex;gap:3px}.icon-button{width:32px;height:32px;display:inline-flex;justify-content:center;align-items:center;border:1px solid transparent;background:transparent;color:var(--muted);border-radius:4px;padding:0}.icon-button:hover{background:#e0e9e4;color:var(--ink)}#editor{height:490px;min-width:0}.cm-editor{height:100%;font-size:13px}.cm-scroller{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.65}.cm-editor.cm-focused{outline:2px solid var(--accent);outline-offset:-2px}.cm-gutters{background:#f6f8f7!important;color:#677973!important;border-right:1px solid #e3e9e6!important}.cm-content{padding:12px 0!important}.cm-line{padding:0 12px!important}#json-fallback{width:100%;height:100%;border:0;padding:16px;font:13px/1.65 ui-monospace,monospace;resize:none;white-space:pre;overflow:auto}.editor-status{min-height:36px;padding:8px 14px;font:11px/1.4 ui-monospace,monospace;color:var(--muted);border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px}.result-content{height:490px;overflow:auto;padding:24px 20px}.result-content h3{font-size:20px;line-height:1.3}.result-content p{font-size:14px;color:var(--muted);margin-top:9px}.result-badge{font-size:11px;line-height:1.4;color:var(--muted);text-align:right}.result-badge[data-state=valid]{color:#14613b;font-weight:700}.result-badge[data-state=invalid]{color:#a02c25;font-weight:700}.result-footnote{min-height:36px;font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding:8px 14px;line-height:1.5}.result-detail{font-size:12px!important}#error-list{list-style:none;padding:0;margin:24px 0 0}#error-list li{padding:15px 0;border-top:1px solid var(--line);margin:0}#error-list button{display:block;background:transparent;border:0;padding:0;text-align:left;color:#9b302a;font:12px/1.6 ui-monospace,monospace;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere;max-width:100%}#error-list p{font-size:13px;margin-top:7px;overflow-wrap:anywhere}#error-list small{font-size:11px;color:var(--muted);overflow-wrap:anywhere;display:block;margin-top:5px}.tool-notice{min-height:24px;font-size:13px;margin-top:10px;color:var(--accent)}.privacy-note{font-size:13px;color:var(--muted);margin:6px 0 23px}.schema-provenance{border-top:1px solid var(--line);padding-top:20px;font-size:12px;color:var(--muted)}.schema-provenance p+p{margin-top:7px}.schema-provenance code{font-size:12px;overflow-wrap:anywhere}.schema-provenance details{margin-top:18px;max-width:950px}.schema-provenance summary{font-weight:600;cursor:pointer;color:var(--ink);padding-bottom:6px}.schema-provenance details p{font-size:13px}.noscript-note{padding:18px;font-size:14px;color:#9b302a}#replace-dialog{border:1px solid var(--line);border-radius:6px;padding:28px;max-width:min(420px,calc(100% - 32px));color:var(--ink)}#replace-dialog::backdrop{background:#172b2980}#replace-dialog h2{font-size:23px}#replace-dialog p{margin:16px 0 25px}.dialog-actions{display:flex;gap:12px;justify-content:flex-end}#replace-dialog button{cursor:pointer;font-family:inherit}.compare-note{font-size:14px;color:var(--muted)}.article-meta-note{max-width:800px}
@media(max-width:950px){.header-inner{min-height:74px}.desktop-nav{display:none}.mobile-nav{display:block}.mobile-nav summary{cursor:pointer;color:var(--accent);font-size:14px;padding:9px 0}.mobile-nav .nav{position:absolute;left:0;right:0;top:74px;background:#fff;border-bottom:1px solid var(--line);z-index:5;display:flex;flex-direction:column;align-items:stretch;gap:0;padding:14px 24px}.mobile-nav a{padding:12px 0}}
@media(max-width:800px){.explorer-panels{grid-template-columns:1fr}.editor-panel{border-right:0;border-bottom:1px solid var(--line)}.result-content{height:auto;min-height:180px;max-height:400px}#editor{height:400px}.explorer-heading{align-items:flex-start}.local-badge{max-width:140px;font-size:12px}.explorer-heading h1{font-size:29px}}
@media(max-width:500px){.explorer-heading{display:block}.local-badge{max-width:none;margin-top:15px}.explorer-toolbar{flex-wrap:wrap;gap:12px}.message-field{width:100%}.message-field select{width:100%;min-width:0}.toolbar-spacer{display:none}.explorer-toolbar .button,.explorer-toolbar .secondary-command{flex:1;padding:10px 8px;font-size:13px}.schema-warning{padding:14px}.schema-warning strong{font-size:14px}.schema-warning p{font-size:12px}.panel-heading{padding:9px 11px;flex-wrap:wrap}.panel-heading h2{font-size:14px}.icon-button{width:30px}.editor-tools{gap:0}.editor-status{font-size:10px}.explorer-wrap{padding-top:18px}}
#editor .cm-gutters{color:#526367!important}