/* Facade guide only. Load AFTER the existing style.css and sign-rules.css.
 * Typography, main colours, buttons, header and footer remain owned by the site.
 * No global resets, font downloads, other-page selectors or fixed brand palette.
 */
.nr-facade-skip{position:fixed;left:18px;top:-100px;z-index:200;padding:12px 18px;border:2px solid var(--blue);border-radius:var(--radius);background:var(--card);color:var(--blue);font:inherit}
.nr-facade-skip:focus{top:12px}
.sign-rules-facade{overflow-wrap:break-word}
.sign-rules-facade [id]{scroll-margin-top:110px}
.sign-rules-facade p{line-height:1.8}
.sign-rules-facade .nr-body>section{min-width:0}
.sign-rules-facade .nr-body p{font-size:16px;color:var(--soft-text);margin:0}
.sign-rules-facade .nr-body p+p{margin-top:15px}
.sign-rules-facade .nr-body h3{font-size:20px;font-weight:650;line-height:1.4;letter-spacing:-.02em;margin:0 0 10px}
.sign-rules-facade .nr-body a:not(.btn):not(.nr-doc-link){color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.sign-rules-facade .nr-body a:hover:not(.btn){color:var(--blue-dark)}
.sign-rules-facade :is(summary,input,button):focus-visible{outline:3px solid var(--blue);outline-offset:4px}
.sign-rules-facade .nr-hero{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:56px;align-items:center;margin-bottom:30px}
.sign-rules-facade .nr-hero h1{max-width:710px}
.sign-rules-facade .nr-hero .sign-rules-intro{max-width:610px}
.sign-rules-facade .nr-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.sign-rules-facade .nr-hero-note{display:flex;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:18px;line-height:1.6}
.sign-rules-facade .nr-hero-note span+span{padding-left:16px;border-left:1px solid var(--line)}
.sign-rules-facade .nr-hero .nr-media{margin:0;min-width:0;padding:12px}
.sign-rules-facade .nr-hero .nr-media figcaption{padding:12px 4px 1px;margin-top:12px;font-size:12px}
.sign-rules-facade .nr-hero .nr-nofoto{min-height:318px;aspect-ratio:1.65}
.sign-rules-facade .nr-facts{margin:0}
.sign-rules-facade .nr-facts>div{padding:22px 26px;gap:9px}
.sign-rules-facade .nr-facts dd{font-size:34px}
.sign-rules-facade .nr-facts dd a{display:inline-block}
.sign-rules-facade .nr-facts dd span{font-size:.67em}
.sign-rules-facade .nr-facts dt{font-size:14px;font-weight:600;line-height:1.4}
.sign-rules-facade .nr-facts dt small{display:block;font-size:12px;font-weight:400;margin-top:5px;color:var(--muted)}
.sign-rules-facade .nr-facts-note{margin:13px 0 0;color:var(--muted);font-size:12px;line-height:1.8}
.sign-rules-facade .nr-facts-note a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.sign-rules-facade .nr-layout{grid-template-columns:minmax(0,1fr) 274px;gap:48px;margin-top:50px}
.sign-rules-facade .nr-body{grid-column:1;grid-row:1}
.sign-rules-facade .nr-toc{grid-column:2;grid-row:1;top:106px;padding:22px;max-height:calc(100dvh - 130px);overflow-y:auto;overscroll-behavior:contain}
.sign-rules-facade .nr-toc-disclosure summary{list-style:none;font-weight:700;font-size:15px;line-height:1.5;margin:0 0 12px}
.sign-rules-facade .nr-toc-disclosure summary::-webkit-details-marker{display:none}
.sign-rules-facade .nr-toc-disclosure summary small{display:none}
.sign-rules-facade .nr-toc-nav{display:grid;gap:4px}
.sign-rules-facade .nr-toc-nav a{display:flex;align-items:baseline;gap:12px;padding:10px 10px;margin:0 -10px;border-radius:7px;font-size:13px;line-height:1.5;color:var(--soft-text)}
.sign-rules-facade .nr-toc-nav a span{font-size:10px;min-width:16px;color:var(--muted);font-variant-numeric:tabular-nums}
.sign-rules-facade .nr-toc-nav a:hover{color:var(--blue);background:var(--bg)}
.sign-rules-facade .nr-toc-nav a[aria-current="location"] span{color:var(--blue)}
.sign-rules-facade .nr-toc-help{margin-top:20px;border-top:1px solid var(--line);padding-top:20px;font-size:12px;line-height:1.8;color:var(--muted)}
.sign-rules-facade .nr-toc-help strong{display:block;font-size:15px;color:var(--text);margin-bottom:5px}
.sign-rules-facade .nr-toc-help a{display:block;color:var(--blue);font-weight:600;margin-top:8px}
.sign-rules-facade .nr-section{margin:0 0 40px;padding:0 0 40px;border-bottom:1px solid var(--line)}
.sign-rules-facade .nr-section h2,.sign-rules-facade #nr-sources>h2{font-size:29px;line-height:1.25;letter-spacing:-.025em;margin:0 0 20px}
.sign-rules-facade .nr-section-label{display:flex;align-items:center;gap:10px;margin-bottom:14px;font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);font-weight:650;line-height:1.5}
.sign-rules-facade .nr-section-label>span{display:grid;place-items:center;min-width:29px;height:26px;background:var(--card);color:var(--blue);border:1px solid var(--line);border-radius:6px;font-size:11px;font-weight:750;letter-spacing:0;font-variant-numeric:tabular-nums}
.sign-rules-facade .nr-body p.nr-source{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px;margin-top:17px;font-size:12px;color:var(--muted);line-height:1.8}
.sign-rules-facade .nr-body p.nr-source a{color:var(--muted);text-decoration-color:var(--line)}
.sign-rules-facade .nr-body p.nr-source a:hover{color:var(--blue);text-decoration-color:currentColor}
.sign-rules-facade .nr-body p.nr-micro{font-size:12px;color:var(--muted);margin-top:15px;line-height:1.8}
.sign-rules-facade .nr-notice{margin:24px 0 0;font-size:15px}
.sign-rules-facade .nr-notice>strong{display:block;margin-bottom:5px}
.sign-rules-facade .nr-notice-neutral{background:var(--card);border-left-color:var(--line)}
.sign-rules-facade .nr-notice p.nr-source{margin-top:10px}
.sign-rules-facade .nr-trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:23px 0}
.sign-rules-facade .nr-mini-card{padding:20px;box-shadow:none}
.sign-rules-facade .nr-mini-card h3{font-size:18px}
.sign-rules-facade .nr-mini-card p{font-size:14px;color:var(--muted);line-height:1.75}
.sign-rules-facade .nr-media{min-width:0;padding:16px}
.sign-rules-facade .nr-media>a{border-radius:8px;overflow:hidden}
.sign-rules-facade .nr-media img{width:100%;max-height:none}
.sign-rules-facade .nr-nofoto{width:100%;min-width:0;max-width:100%;position:relative;display:flex;align-items:center;justify-content:center;min-height:248px;aspect-ratio:16/8.5;padding:57px 24px 48px;background:var(--bg);border:1px dashed var(--line);border-radius:8px}
.sign-rules-facade .nr-media-label{position:absolute;top:16px;left:16px;display:flex;gap:10px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:6px;padding:5px 10px;font-size:10px;line-height:1.5;color:var(--blue);font-weight:700;letter-spacing:.04em}
.sign-rules-facade .nr-media-label span{color:var(--muted);font-weight:400}
.sign-rules-facade .nr-nofoto-center{display:flex;flex-direction:column;align-items:center;text-align:center;gap:9px;min-width:0;max-width:min(345px,100%)}
.sign-rules-facade .nr-nofoto-center strong{font-size:20px;color:var(--soft-text);font-weight:600;letter-spacing:-.02em;line-height:1.35}
.sign-rules-facade .nr-nofoto-center>span:last-child{font-size:13px;line-height:1.7;color:var(--muted)}
.sign-rules-facade .nr-nofoto-word{font-size:10px;letter-spacing:.18em;color:var(--muted);line-height:1.6;margin-top:5px}
.sign-rules-facade .nr-empty-frame{width:43px;height:34px;border:1px solid var(--muted);border-radius:6px;position:relative;opacity:.65}
.sign-rules-facade .nr-empty-frame:after{content:"";position:absolute;left:8px;top:7px;width:10px;height:10px;border:1px solid var(--muted);border-radius:50%}
.sign-rules-facade .nr-media-size{position:absolute;bottom:15px;left:14px;right:14px;text-align:center;font-size:10px;color:var(--muted);line-height:1.5}
.sign-rules-facade .nr-table-wrap{margin-top:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);overflow-x:auto}
.sign-rules-facade table{border-collapse:collapse;width:100%;min-width:570px;text-align:left;font-size:14px;line-height:1.7}
.sign-rules-facade caption{padding:14px 18px;text-align:left;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}
.sign-rules-facade :is(th,td){text-align:left;vertical-align:top;padding:17px 18px;border-bottom:1px solid var(--line)}
.sign-rules-facade th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;background:var(--bg);font-weight:700;color:var(--muted)}
.sign-rules-facade th:first-child{width:22%}.sign-rules-facade th:nth-child(2){width:26%}
.sign-rules-facade td:nth-child(2){color:var(--blue-dark);font-weight:650}
.sign-rules-facade td:last-child{color:var(--soft-text)}
.sign-rules-facade tr:last-child td{border-bottom:0}
.sign-rules-facade .nr-scroll-tip{display:none}
.sign-rules-facade .nr-example{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:24px;padding:23px;margin-top:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
.sign-rules-facade .nr-example h3{font-size:18px}
.sign-rules-facade .nr-example p{font-size:14px;line-height:1.75;color:var(--muted)}
.sign-rules-facade .nr-equation{font-size:27px;line-height:1.3;white-space:nowrap;letter-spacing:-.03em;color:var(--blue);font-weight:650}
.sign-rules-facade .nr-equation small{display:block;font-size:11px;line-height:1.7;color:var(--muted);font-weight:400;letter-spacing:0;margin-top:5px}
.sign-rules-facade .nr-split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin-top:24px}
.sign-rules-facade .nr-split>div{min-width:0}
.sign-rules-facade .nr-split .nr-media{margin:0 0 20px;padding:12px}
.sign-rules-facade .nr-split .nr-nofoto{aspect-ratio:4/3;min-height:250px;padding-inline:18px}
.sign-rules-facade .nr-split .nr-nofoto-center strong{font-size:18px}
.sign-rules-facade .nr-split p{font-size:15px;color:var(--soft-text)}
.sign-rules-facade .nr-checklist{margin-top:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);overflow:hidden}
.sign-rules-facade .nr-check{display:flex;align-items:flex-start;gap:14px;padding:17px 20px;cursor:pointer;font-size:15px;line-height:1.6}
.sign-rules-facade .nr-check+.nr-check{border-top:1px solid var(--line)}
.sign-rules-facade .nr-check:hover{background:var(--bg)}
.sign-rules-facade .nr-check input{accent-color:var(--blue);width:18px;height:18px;flex:0 0 18px;margin:3px 0 0}
.sign-rules-facade .nr-check strong{display:block;font-weight:600}
.sign-rules-facade .nr-check small{display:block;font-size:13px;line-height:1.7;color:var(--muted);margin-top:3px}
.sign-rules-facade .nr-accordion{margin:22px 0 0;border-top:1px solid var(--line)}
.sign-rules-facade .nr-accordion details{padding:0}
.sign-rules-facade .nr-accordion summary{position:relative;list-style:none;font-size:17px;line-height:1.5;padding:20px 37px 20px 0}
.sign-rules-facade .nr-accordion summary::-webkit-details-marker{display:none}
.sign-rules-facade .nr-accordion summary:after{content:"+";position:absolute;right:5px;top:15px;font-size:25px;color:var(--blue);font-weight:400}
.sign-rules-facade .nr-accordion details[open] summary:after{content:"−"}
.sign-rules-facade .nr-detail-body{padding:0 30px 23px 0}
.sign-rules-facade .nr-detail-body p{font-size:15px;color:var(--muted)}
.sign-rules-facade .nr-mistakes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}
.sign-rules-facade .nr-mistake{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
.sign-rules-facade .nr-mistake small{display:block;font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:10px;line-height:1.6}
.sign-rules-facade .nr-mistake h3{font-size:18px}
.sign-rules-facade .nr-mistake p{font-size:14px;color:var(--muted);line-height:1.8}
.sign-rules-facade .nr-source-list{display:grid;gap:12px;margin-top:24px}
.sign-rules-facade .nr-doc-link{flex-direction:row;align-items:center;gap:16px;padding:20px;border-radius:var(--radius);box-shadow:none}
.sign-rules-facade .nr-doc-type{display:inline-block;align-self:flex-start;min-width:51px;text-align:center;padding:7px;font-size:10px;font-weight:700;line-height:1.5;color:var(--blue);border:1px solid var(--line);border-radius:6px;background:var(--bg)}
.sign-rules-facade .nr-doc-text{flex:1;min-width:0}
.sign-rules-facade .nr-doc-text strong{display:block;font-size:16px;line-height:1.5;font-weight:650}
.sign-rules-facade .nr-doc-text small{display:block;margin-top:5px;font-size:12px;line-height:1.7;color:var(--muted)}
.sign-rules-facade .nr-doc-arrow{font-size:23px;color:var(--blue);flex-shrink:0}
.sign-rules-facade .nr-related{margin-top:35px}
.sign-rules-facade .nr-related h3{font-size:25px}
.sign-rules-facade .nr-related-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:18px}
.sign-rules-facade .nr-related-links a{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:15px 17px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);text-decoration:none!important;font-size:14px;line-height:1.6}
.sign-rules-facade .nr-related-links a:hover{border-color:var(--blue)}
.sign-rules-facade .nr-contact{margin-top:54px}
.sign-rules-facade .nr-contact .nr-contact-copy{flex:1;min-width:0}
.sign-rules-facade .nr-contact .nr-contact-actions{display:flex;flex-direction:column;gap:10px;max-width:295px;flex:0 0 295px}
.sign-rules-facade .nr-contact .btn{width:100%}
.sign-rules-facade .nr-contact .btn-light{background:transparent;color:inherit;border-color:currentColor}
.sign-rules-facade .nr-contact p.nr-contact-note{font-size:11px;line-height:1.8;margin:0;opacity:.9}
@media(max-width:1100px){
 .sign-rules-facade .nr-hero{gap:28px;grid-template-columns:minmax(0,1fr) minmax(0,.9fr)}
 .sign-rules-facade .nr-layout{gap:28px;grid-template-columns:minmax(0,1fr) 235px}
 .sign-rules-facade .nr-toc{padding:18px}
 .sign-rules-facade .nr-hero .nr-nofoto{min-height:337px;aspect-ratio:auto}
 .sign-rules-facade .nr-trio{grid-template-columns:1fr;gap:10px}
 .sign-rules-facade .nr-mini-card{display:grid;grid-template-columns:140px minmax(0,1fr);gap:15px}
 .sign-rules-facade .nr-mini-card h3{margin:0}
 .sign-rules-facade .nr-example{grid-template-columns:1fr;gap:16px}
 .sign-rules-facade .nr-split{grid-template-columns:1fr;gap:30px}
 .sign-rules-facade .nr-contact .nr-contact-actions{flex:auto;max-width:none;width:100%;display:grid;grid-template-columns:1fr 1fr}
 .sign-rules-facade .nr-contact p.nr-contact-note{grid-column:1/-1}
}
@media(max-width:800px){
 .sign-rules-facade .nr-hero{grid-template-columns:1fr;gap:25px}
 .sign-rules-facade .nr-hero .nr-nofoto{min-height:270px;aspect-ratio:2}
 .sign-rules-facade .nr-layout{display:flex;flex-direction:column;gap:28px;margin-top:30px}
 .sign-rules-facade .nr-toc{position:static;width:100%;padding:18px 20px;max-height:none;overflow:visible}
 .sign-rules-facade .nr-body{width:100%}
 .sign-rules-facade .nr-toc-disclosure summary{position:relative;margin:0;padding-right:25px;cursor:pointer;display:flex;align-items:center;gap:12px;justify-content:space-between}
 .sign-rules-facade .nr-toc-disclosure summary small{display:block;font-size:11px;color:var(--muted);font-weight:400}
 .sign-rules-facade .nr-toc-disclosure summary:after{content:"+";font-size:23px;font-weight:400;position:absolute;right:0;top:-4px;color:var(--blue)}
 .sign-rules-facade .nr-toc-disclosure[open] summary:after{content:"−"}
 .sign-rules-facade .nr-toc-nav{margin-top:14px;display:grid!important}
 .sign-rules-facade .nr-toc-help{display:none}
 .sign-rules-facade .nr-section{margin-bottom:30px;padding-bottom:30px}
 .sign-rules-facade .nr-trio{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
 .sign-rules-facade .nr-mini-card{display:block;padding:16px}
 .sign-rules-facade .nr-mini-card h3{margin-bottom:9px}
 .sign-rules-facade .nr-split{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
}
@media(max-width:680px){
 .sign-rules-facade .nr-hero .nr-nofoto{min-height:265px;aspect-ratio:1.5}
 .sign-rules-facade .nr-hero-note{gap:9px;font-size:10px}
 .sign-rules-facade .nr-hero-note span+span{padding-left:9px}
 .sign-rules-facade .nr-actions{gap:9px;margin-top:22px}
 .sign-rules-facade .nr-actions .btn{flex:1 1 180px;width:auto;padding:13px 14px;font-size:13px}
 .sign-rules-facade .nr-facts{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
 .sign-rules-facade .nr-facts>div{display:flex;flex-direction:column;align-items:flex-start;gap:8px;padding:14px 12px}
 .sign-rules-facade .nr-facts dd{flex:auto;font-size:26px}
 .sign-rules-facade .nr-facts dt{flex:auto;font-size:11px}
 .sign-rules-facade .nr-facts dt small{font-size:10px}
 .sign-rules-facade .nr-facts-note{font-size:10px}
 .sign-rules-facade .nr-body p{font-size:15px}
 .sign-rules-facade .nr-section h2,.sign-rules-facade #nr-sources>h2{font-size:25px;margin-bottom:18px}
 .sign-rules-facade .nr-section-label{font-size:10px}
 .sign-rules-facade .nr-trio,.sign-rules-facade .nr-split,.sign-rules-facade .nr-mistakes{grid-template-columns:1fr}
 .sign-rules-facade .nr-trio{gap:10px}
 .sign-rules-facade .nr-mini-card{padding:18px}
 .sign-rules-facade .nr-mini-card p,.sign-rules-facade .nr-mistake p{font-size:14px}
 .sign-rules-facade .nr-media{padding:12px;margin-top:23px}
 .sign-rules-facade .nr-nofoto{aspect-ratio:4/3;min-height:250px;padding:54px 18px 45px}
 .sign-rules-facade .nr-nofoto-center strong{font-size:18px}
 .sign-rules-facade .nr-media figcaption{font-size:12px;line-height:1.7;padding-top:12px;margin-top:12px}
 .sign-rules-facade .nr-notice{font-size:14px;padding:17px}
 .sign-rules-facade .nr-body p.nr-source{font-size:11px}
 .sign-rules-facade .nr-body p.nr-scroll-tip{display:block;font-size:11px;color:var(--muted);margin-top:7px}
 .sign-rules-facade .nr-equation{font-size:26px}
 .sign-rules-facade .nr-example{padding:20px}
 .sign-rules-facade :is(th,td){padding:14px}
 .sign-rules-facade .nr-check{padding:15px;font-size:14px}
 .sign-rules-facade .nr-check small{font-size:12px}
 .sign-rules-facade .nr-accordion summary{font-size:16px}
 .sign-rules-facade .nr-detail-body{padding-right:8px}
 .sign-rules-facade .nr-doc-link{gap:12px;padding:15px}
 .sign-rules-facade .nr-doc-type{min-width:42px;font-size:9px;padding:5px}
 .sign-rules-facade .nr-doc-text strong{font-size:14px}
 .sign-rules-facade .nr-doc-text small{font-size:11px}
 .sign-rules-facade .nr-related-links{grid-template-columns:1fr}
 .sign-rules-facade .nr-contact{margin-top:36px}
 .sign-rules-facade .nr-contact .nr-contact-actions{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){.sign-rules-facade *{scroll-behavior:auto!important;transition:none!important}}
@media print{
 .sign-rules-facade{padding:0;background:white}
 .sign-rules-facade .nr-layout{display:block}
 .sign-rules-facade :is(.nr-toc,.nr-actions,.nr-contact){display:none}
 .sign-rules-facade .nr-hero{display:block}
 .sign-rules-facade .nr-hero .nr-media{display:none}
 .sign-rules-facade .nr-nofoto{min-height:140px;aspect-ratio:auto}
 .sign-rules-facade .nr-table-wrap{overflow:visible}
 .sign-rules-facade table{min-width:0}
 .sign-rules-facade h2{break-after:avoid}
}


/* Inline explanatory schematic in section 01 */
.sign-rules-facade [data-media-id="F08"]{max-width:1100px;margin:24px auto 10px;}
.sign-rules-facade [data-media-id="F08"] figcaption{text-align:center;}


.nr-pair-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin: 24px 0 12px;
}
.nr-inline-media {
  margin: 0;
}
.nr-inline-media img {
  width: 100%;
  height: auto;
  display: block;
}
.nr-inline-media figcaption {
  text-align: left;
}
@media (max-width: 860px) {
  .nr-pair-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}