/* shared-shell v1 (2026-10-17): reusable full-width site shell. Top bar (logo far left, nav + theme toggle far right),
   accessible dropdowns, mobile menu, fluid container and wide footer. Theme comes from CSS custom properties the host site
   sets on html[data-theme]. Fallbacks below keep it usable on its own. */
:root{--shell-max:1920px;--shell-gut:clamp(12px,2.5vw,48px)}
.shell-c{width:100%;max-width:var(--shell-max);margin:0 auto;padding-left:var(--shell-gut);padding-right:var(--shell-gut);box-sizing:border-box}
.skip{position:absolute;left:-9999px;top:0;z-index:100;background:var(--paper,#fff);color:var(--text,#111);padding:8px 12px}
.skip:focus{left:8px;top:8px}
.topbar{position:sticky;top:0;z-index:40;background:var(--chrome,rgba(255,255,255,.94));border-bottom:1px solid var(--chrome-border,#ddd);backdrop-filter:blur(10px)}
.topbar-in{display:flex;align-items:center;gap:18px;min-height:60px;padding-top:8px;padding-bottom:8px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text,#111);font-family:var(--font-head,Georgia,serif)!important;font-weight:700;font-size:20px;letter-spacing:.04em}
.rfc-badge{font-family:var(--font-mono,monospace)!important;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent,#1554c0);border:1px solid var(--accent,#1554c0);border-radius:999px;padding:3px 10px;white-space:nowrap}
#primary-nav{margin-right:auto}
#primary-nav>ul{list-style:none;margin:0 0 0 -14px;padding:0;display:flex;gap:4px;align-items:center}
#primary-nav a,#primary-nav .dd-btn{font:inherit;font-size:15px;color:var(--text,#111);text-decoration:none;background:none;border:0;padding:10px 14px;border-radius:6px;cursor:pointer;display:block}
#primary-nav a:hover,#primary-nav .dd-btn:hover,#primary-nav a[aria-current="page"]{background:var(--btn-hover,rgba(0,0,0,.06));color:var(--accent,#1554c0)}
#primary-nav a:focus-visible,#primary-nav .dd-btn:focus-visible,.topbar .icon-btn:focus-visible,.menu-btn:focus-visible{outline:2px solid var(--accent,#1554c0);outline-offset:2px}
.dd{position:relative}
.dd-btn .chev{display:inline-block;margin-left:6px;transition:transform .15s}
.dd-btn[aria-expanded="true"] .chev{transform:rotate(180deg)}
.dd-menu{list-style:none;margin:0;padding:6px;position:absolute;left:0;top:calc(100% + 6px);min-width:300px;background:var(--drawer,#fff);border:1px solid var(--chrome-border,#ddd);border-radius:10px;box-shadow:0 12px 32px rgba(0,0,0,.35)}
.dd-menu a{padding:10px 12px!important}
.dd-menu small{display:block;color:var(--muted,#555);font-size:13px!important}
.menu-btn{display:none;font:inherit;font-size:15px;color:var(--text,#111);background:none;border:1px solid var(--chrome-border,#ddd);border-radius:6px;padding:8px 14px;cursor:pointer}
.topbar .icon-btn{flex:0 0 auto;border-radius:6px;margin-left:auto}
@media (max-width:820px){
  .topbar-in{flex-wrap:wrap}
  .menu-btn{display:inline-block}
  #primary-nav{display:none;order:10;flex-basis:100%;margin:0}
  #primary-nav.open{display:block}
  #primary-nav>ul{flex-direction:column;align-items:stretch;padding:6px 0 10px;margin:0}
  .dd-menu{position:static;min-width:0;box-shadow:none;margin:4px 0 4px 12px}
}
@media (max-width:560px){.rfc-badge .long{display:none}.topbar-in{gap:10px}.rfc-badge{font-size:10px;letter-spacing:.02em;padding:3px 8px}.menu-btn{padding:8px 10px}}
.site-foot{background:var(--band,#f4f4f4);border-top:1px solid var(--card-line,#ddd);font-family:var(--font-body,system-ui)!important;color:var(--muted,#555)}
.site-foot .shell-c{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-top:40px;padding-bottom:24px}
.site-foot h2{font-size:16px!important;margin:0 0 10px;color:var(--text,#111)}
.site-foot p,.site-foot li{font-size:14px!important;color:var(--muted,#555)}
.site-foot ul{list-style:none;margin:0;padding:0}.site-foot li{margin:6px 0}
.site-foot .legal{grid-column:1/-1;border-top:1px solid var(--card-line,#ddd);padding-top:16px;margin:0}
.site-foot .legal p{font-size:13px!important;margin:0 0 6px}
@media (max-width:900px){.site-foot .shell-c{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.site-foot .shell-c{grid-template-columns:1fr}}
/* brand band (logo lockup + utility area: links, social slot, search) */
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.brandbar{background:var(--paper,#fff);border-bottom:1px solid var(--chrome-border,#ddd)}
.brandbar-in{display:flex;align-items:center;justify-content:space-between;gap:16px 24px;padding-top:clamp(10px,1.2vw,18px);padding-bottom:clamp(10px,1.2vw,18px);flex-wrap:wrap}
.brand-left{display:flex;align-items:center;gap:clamp(10px,1.5vw,22px);flex-wrap:wrap}
.lockup{display:block;line-height:0}
.lockup img{height:clamp(54px,6.8vw,96px);width:auto;display:block}
html[data-theme="light"] .logo-dark,html:not([data-theme="light"]) .logo-light{display:none!important}
.brandbar .rfc-badge{font-size:clamp(11px,.95vw,14px);padding:4px 12px}
.utility{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.util-links{list-style:none;margin:0;padding:0;display:flex;gap:6px;font-size:14px}
.util-links li+li::before{content:"|";color:var(--muted,#777);margin-right:6px}
.util-links a{color:var(--link,#1554c0);text-decoration:none;font-size:14px}.util-links a:hover{text-decoration:underline}
.social{list-style:none;margin:0;padding:0;display:flex;gap:6px}.social[hidden]{display:none}
.social a{display:inline-flex;width:30px;height:30px;align-items:center;justify-content:center;border:1px solid var(--chrome-border,#ddd);border-radius:6px;color:var(--text,#111)}
.social svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7}
.social a:hover{color:var(--accent,#1554c0);border-color:var(--accent,#1554c0)}
.site-search{position:relative;display:flex;align-items:stretch;width:min(320px,100%)}
.site-search input{flex:1;min-width:0;font:inherit;font-size:15px;color:var(--text,#111);background:var(--card,#fff);border:1px solid var(--chrome-border,#ccc);border-right:0;border-radius:6px 0 0 6px;padding:8px 10px}
.site-search input::placeholder{color:var(--muted,#666)}
.site-search button{width:42px;border:1px solid var(--chrome-border,#ccc);border-radius:0 6px 6px 0;background:var(--card,#fff);color:var(--text,#111);cursor:pointer;display:flex;align-items:center;justify-content:center}
.site-search svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2}
.site-search input:focus-visible,.site-search button:focus-visible{outline:2px solid var(--accent,#1554c0);outline-offset:1px}
.sq-list{position:absolute;right:0;top:calc(100% + 4px);z-index:60;width:min(440px,92vw);max-height:70vh;overflow:auto;list-style:none;margin:0;padding:6px;background:var(--drawer,#fff);border:1px solid var(--chrome-border,#ddd);border-radius:8px;box-shadow:0 12px 32px rgba(0,0,0,.35)}
.sq-item{padding:8px 10px;border-radius:6px;cursor:pointer;display:block}
.sq-item[aria-selected="true"],.sq-item:hover{background:var(--btn-hover,rgba(0,0,0,.06))}
.sq-t{display:block;color:var(--text,#111);font-size:15px}
.sq-u{display:block;color:var(--muted,#666);font-size:12px!important;font-family:var(--font-mono,monospace)!important}
.sq-empty{padding:8px 10px;color:var(--muted,#666)}
.sq-all{border-top:1px solid var(--chrome-border,#ddd);margin-top:4px;padding:8px 10px}.sq-all a{color:var(--link,#1554c0)}
@media (max-width:820px){
  .utility{width:100%;align-items:stretch;flex-direction:row;flex-wrap:wrap;justify-content:space-between}
  .site-search{width:100%;order:3}
  .sq-list{left:0;right:auto;width:100%}
}