:root{color-scheme:light;--ink:#17313e;--muted:#526772;--paper:#f5f7f6;--line:#d6e1e2;--blue:#14699a;--teal:#087768;--amber:#986018;font:16px/1.65 "Segoe UI",Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink)}a{color:var(--blue);text-underline-offset:3px}a:hover{color:var(--teal)}a:focus-visible{outline:3px solid #db9a30;outline-offset:4px}p{margin:0 0 1em}h1,h2,h3{line-height:1.2;letter-spacing:-.025em}h1{font-size:clamp(2.25rem,5vw,3.9rem);max-width:850px;margin:18px 0 22px}h2{font-size:1.8rem;margin:0 0 22px}h3{font-size:1.22rem;margin:24px 0 14px}code,kbd,.equation{font-family:Consolas,"Liberation Mono",monospace}code{font-size:.88em;overflow-wrap:anywhere}kbd{border:1px solid var(--line);border-bottom-width:3px;border-radius:4px;padding:1px 5px;font-size:.85em}small,.muted{color:var(--muted)}
.skip{position:absolute;top:-100px;left:10px;background:white;padding:12px;z-index:5}.skip:focus{top:10px}.top{max-width:1440px;margin:auto;padding:24px 40px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line)}.brand{font-size:23px;font-weight:750;letter-spacing:.05em;text-decoration:none;color:var(--ink)}.brand span{font-weight:400;color:var(--muted);font-size:14px;letter-spacing:0;margin-left:15px}.languages{display:flex;gap:7px;align-items:center;font-size:14px}.languages a,.languages strong{border:1px solid var(--line);border-radius:6px;padding:5px 12px;text-decoration:none}.languages strong{background:var(--ink);color:white;border-color:var(--ink)}
.layout{max-width:1440px;margin:auto;display:grid;grid-template-columns:238px minmax(0,1fr);gap:54px;padding:0 40px}.toc{position:sticky;top:25px;align-self:start;max-height:calc(100vh - 50px);overflow:auto;padding:38px 4px 25px 0;font-size:14px}.toc b{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted)}.toc a{display:block;text-decoration:none;padding:7px 0;color:var(--ink)}.toc a:hover{color:var(--teal)}.toc .subnav{border-left:1px solid var(--line);margin:6px 0 18px 4px;padding-left:16px}.toc .subnav a{font-size:12px;padding:3px 0}.toc .offline{border-top:1px solid var(--line);padding-top:18px;margin-top:18px;font-size:12px;color:var(--muted)}main{min-width:0;padding:45px 0 75px;max-width:980px}.eyebrow{color:var(--teal);font-size:12px;font-weight:700;letter-spacing:.13em;text-transform:uppercase}.lead{font-size:20px;max-width:780px;color:var(--muted);line-height:1.6}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0 35px}.chips span{font-size:12px;border:1px solid var(--line);border-radius:30px;padding:4px 12px;background:white}section{padding:38px 0;border-top:1px solid var(--line)}.intro{padding-top:0;border:0}.section-number{font-size:13px;color:var(--teal);font-family:Consolas,monospace;display:block;margin-bottom:10px}.note{border-left:3px solid var(--teal);background:#e9f3ef;padding:17px 20px;margin:24px 0}.note p:last-child{margin:0}.note.caution{border-color:var(--amber);background:#faf2e3}.equation{background:#eef2f3;border:1px solid var(--line);border-radius:7px;padding:15px 18px;line-height:1.85;margin:18px 0;overflow-wrap:anywhere;font-size:.94rem}.equation small{font:14px "Segoe UI",Arial,sans-serif}.table-scroll{overflow:auto;border:1px solid var(--line);border-radius:8px;margin:20px 0}table{border-collapse:collapse;width:100%;font-size:14px;background:white}th,td{text-align:left;vertical-align:top;padding:12px 15px;border-bottom:1px solid var(--line)}th{font-size:12px;background:#eaf0f1;color:#37515e}tr:last-child td{border-bottom:0}td:first-child{font-weight:600}td p:last-child{margin:0}.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}.card{border:1px solid var(--line);border-radius:10px;background:white;padding:22px}.card h3{margin:0 0 12px}.card p:last-child{margin-bottom:0}.block{border:1px solid var(--line);border-radius:10px;background:white;padding:26px;margin:20px 0;scroll-margin-top:25px}.block h3{display:flex;gap:16px;align-items:center;margin:0 0 15px}.symbol{display:inline-flex;align-items:center;justify-content:center;min-width:58px;height:48px;padding:0 10px;background:#e9f3ef;border:1.5px solid #8bada6;border-radius:8px;color:#1a6054;font:600 23px Consolas,monospace}.symbol.junction{border-radius:50%;min-width:48px;width:48px}.symbol.source{background:#edf3fc;border-color:#94b2d3;color:#255d91}.block h3 small{font-size:12px;font-weight:400;display:block;letter-spacing:0;margin-top:5px}.ports{font-size:13px;color:var(--muted);margin-bottom:16px}.ports code{font-size:13px;font-weight:700;color:var(--blue)}.block dl{display:grid;grid-template-columns:135px minmax(0,1fr);gap:8px 15px;font-size:14px;margin:18px 0 0}.block dt{font-weight:650}.block dd{margin:0}.block p:last-child{margin-bottom:0}.block .table-scroll{margin-bottom:0}.block table{font-size:13px}.legend-line{display:inline-block;width:30px;border-top:3px solid #14699a;vertical-align:middle;margin-right:8px}.legend-line.mechanical{border-top:3px dashed #986018}.checklist li,ol li{padding-left:5px;margin-bottom:10px}.figure{margin:24px 0;border:1px solid #c9d7dc;border-radius:10px;overflow:hidden;background:#fff}.figure svg{width:100%;height:auto;display:block;background:#112430}.figure figcaption{padding:14px 20px;font-size:13px;color:var(--muted);border-top:1px solid var(--line)}svg text{font-family:"Segoe UI",Arial,sans-serif;fill:#e4eff3;font-size:16px}svg .label{fill:#a9c1ce;font-size:13px}svg .annotation{fill:#83dfc8;font-size:14px}svg .wire{fill:none;stroke:#91bed8;stroke-width:2.5}svg .mechanical{stroke:#f5c278;stroke-dasharray:8 5}svg .stroke{stroke:#f3f9fa;stroke-width:3}svg .box{fill:#213d50;stroke:#8db4c9;stroke-width:1.5}svg .junction{fill:#1d4142;stroke:#83c6b8;stroke-width:1.5}svg .port{fill:#102832;stroke:#a2cfe0;stroke-width:2}svg .callout{fill:none;stroke:#83dfc8;stroke-width:1;stroke-dasharray:3 3}svg .symbol-text{font:600 22px Consolas,monospace}svg .sign{fill:#f5c278;font:20px Consolas,monospace}.footer{color:var(--muted);font-size:13px;border-top:1px solid var(--line);padding-top:25px}.back{float:right}details{margin:15px 0}summary{cursor:pointer;font-weight:600;color:var(--teal)}
@media(max-width:1050px){.layout{grid-template-columns:180px minmax(0,1fr);gap:30px;padding:0 25px}.top{padding:20px 25px}.cards{grid-template-columns:1fr}.block{padding:20px}.block dl{grid-template-columns:110px minmax(0,1fr)}}
@media(max-width:760px){.top{padding:18px 20px;flex-wrap:wrap}.brand span{display:none}.layout{display:block;padding:0 20px}.toc{position:static;max-height:none;padding:20px 0;border-bottom:1px solid var(--line);display:flex;gap:8px 18px;flex-wrap:wrap}.toc>b{width:100%}.toc>a{padding:2px 0}.toc .subnav,.toc .offline{display:none}main{padding-top:30px}.lead{font-size:18px}h2{font-size:1.5rem}.block{padding:18px 15px}.block dl{display:block}.block dt{margin-top:12px}.block dd{margin-top:3px}.equation{padding:12px;font-size:.85rem}.table-scroll th,.table-scroll td{padding:10px;min-width:110px}.figure{overflow-x:auto}.figure svg{min-width:650px}.back{float:none;display:block;margin-bottom:8px}}
.brand{display:inline-flex;align-items:center;gap:12px}.brand-icon{display:block;width:42px;height:42px;padding:4px;background:var(--ink);border-radius:8px;object-fit:contain;flex-shrink:0;print-color-adjust:exact}.brand span{margin-left:3px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Topic pages mirror the Elements domain / category hierarchy. */
[hidden]{display:none!important}
h1{font-size:clamp(2rem,4vw,3.1rem);margin:12px 0 18px}
.toc>b{display:block;margin:22px 0 8px}.toc a[aria-current=page]{color:var(--teal);font-weight:700;border-left:3px solid var(--teal);padding-left:10px}
.domain-cards{grid-template-columns:repeat(3,minmax(0,1fr))}.domain-card{display:block;text-decoration:none;color:var(--ink)}.domain-card:hover{border-color:var(--teal);background:#f1f8f5}.domain-card small{font-size:13px}
.component-entry{border:1px solid var(--line);border-radius:8px;background:white;margin:10px 0;overflow:hidden}
.component-entry>summary{display:flex;align-items:center;gap:14px;list-style:none;padding:14px 16px;color:var(--ink)}.component-entry>summary::-webkit-details-marker{display:none}.component-entry>summary:after{content:'+';margin-left:auto;color:var(--teal);font-size:22px;font-weight:400}.component-entry[open]>summary:after{content:'−'}
.component-entry>summary small{display:block;color:var(--muted);font-size:12px;font-weight:400;line-height:1.5;margin-top:4px}.component-entry .symbol{min-width:42px;height:38px;font-size:19px;flex-shrink:0}.component-unit{font:13px Consolas,monospace;white-space:nowrap;margin-left:auto;color:var(--muted)}
.component-body{border-top:1px solid var(--line);padding:20px}.component-body dl{display:grid;grid-template-columns:120px minmax(0,1fr);gap:10px 16px;font-size:14px}.component-body dt{font-weight:650}.component-body dd{margin:0}
.detail-actions{display:flex;gap:8px;margin:16px 0}.detail-actions button{font:inherit;font-size:13px;color:var(--teal);background:white;border:1px solid var(--line);border-radius:5px;padding:6px 12px;cursor:pointer}.detail-actions button:hover{background:#e9f3ef}button:focus-visible,summary:focus-visible{outline:3px solid #db9a30;outline-offset:3px}
.advanced-entry{display:block;background:white;border:1px solid var(--line);border-radius:8px;padding:15px 18px;text-decoration:none;margin:10px 0}.advanced-entry span,.advanced-entry em{display:block;font-size:13px;color:var(--muted)}.advanced-entry em{font-style:normal;color:var(--teal);margin-top:4px}.advanced-entry:hover{border-color:var(--teal)}.library-group{font-size:14px;color:var(--muted);letter-spacing:0}.breadcrumb{font-size:14px}.legend-line.electrical{border-color:#8850ba}
pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.8 Consolas,monospace;background:#eef2f3;padding:18px;border-radius:7px}
@media(max-width:1050px){.domain-cards{grid-template-columns:1fr}.component-entry>summary{gap:10px}}
@media(max-width:760px){.toc>b{margin:10px 0 0}.component-body{padding:15px}.component-body dl{display:block}.component-body dt{margin-top:12px}.component-unit{font-size:11px}.component-entry>summary{padding:12px 10px}.component-entry>summary small{font-size:11px}.detail-actions{flex-wrap:wrap}}
@media print{.detail-actions{display:none}.component-entry{break-inside:avoid}.component-entry>summary:after{display:none}.component-body{padding:12px}.domain-cards{display:block}.domain-card{margin:10px 0}}
@media print{:root{font-size:10pt;color-scheme:light}body{background:white;color:black}.top{padding:0 0 12px}.languages,.toc,.skip,.back{display:none}.layout{display:block;padding:0}.top,main{max-width:none}main{padding:15px 0}h1{font-size:30pt}h2{font-size:20pt}section{padding:20px 0}.block,.figure,.card{break-inside:avoid}h2,h3{break-after:avoid}.cards{display:block}.card{margin:12px 0}.table-scroll{overflow:visible}a{color:inherit}.figure svg{min-width:0;print-color-adjust:exact}.figure{overflow:visible}.note{print-color-adjust:exact}.footer{margin-top:15px}}

/* Static reference schematics: offline, accessible, and printable. */
.bg-schematic svg .signal-wire{stroke:#eea2d2;stroke-dasharray:6 5}.bg-schematic svg .arrow-head{stroke-dasharray:none}.bg-schematic{margin:20px 0}.bg-schematic svg{min-width:540px}.block h4{margin:28px 0 12px;font-size:1.1rem}.bg-schematic svg text{font-size:16px}.bg-schematic svg .label{font-size:14px}.bg-schematic svg .symbol-text{font-size:22px}.bg-schematic svg .annotation{font-size:16px}
@media print{.bg-schematic svg{min-width:0}}