:root{
  --brand:#285aff; --brand-deep:#1641d8; --brand-soft:#eff3ff;
  --canvas:#fbfbfc; --surface:#fff; --subtle:#f7f7f9;
  --line:#e7e7eb; --line-strong:#d8d8df;
  --ink:#111317; --muted:#6f6f78; --faint:#9696a0;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --display:"Newsreader",Georgia,"Times New Roman",serif;
  --sidebar:264px; --content:760px; --toc:220px;
  --shell-max:1360px; --gutter:clamp(16px,3vw,40px);
}

/* ── Implementations: compact list cards, not a wide table ──────────────────────────── */
.impl-actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 26px}
.impl-cta{display:inline-flex;align-items:center;min-height:38px;border-radius:9px;
  background:var(--brand);color:#fff;font-size:14px;font-weight:600;padding:0 16px}
.impl-cta:hover{background:var(--brand-deep);text-decoration:none;color:#fff}
.impl-crit{display:inline-flex;align-items:center;min-height:38px;border-radius:9px;
  border:1px solid var(--line);color:var(--ink);font-size:14px;font-weight:550;padding:0 15px}
.impl-crit:hover{border-color:var(--brand);text-decoration:none}
.impl-list{display:grid;gap:12px;margin:0 0 32px}
.impl-card{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--surface)}
.impl-card:hover{border-color:var(--line-strong)}
.impl-head{display:flex;align-items:center;gap:12px}
.impl-head b{font-size:16px;font-weight:640}
.impl-head a{color:var(--ink)}
.impl-head a:hover{color:var(--brand)}
.role{margin-left:auto;font-size:11px;font-weight:660;letter-spacing:.03em;text-transform:uppercase;
  border-radius:6px;padding:3px 9px;white-space:nowrap}
.role-server{background:var(--brand-soft);color:var(--brand-deep)}
.role-client{background:var(--subtle);color:var(--muted)}
.impl-card p{margin:8px 0 0;color:var(--muted);font-size:14px;line-height:1.55}
.impl-card .impl-meta{margin-top:8px;font:500 12px/1 var(--mono);color:var(--faint)}
.impl-card .impl-level{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin-top:10px;font-size:12px;color:var(--muted)}
.impl-card .impl-level a{white-space:nowrap}
.impl-card .impl-level img{display:block;height:20px;width:auto}
/* Drawer nav: primary links shown inside the mobile sidebar drawer only */
.drawernav{display:none;margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.drawernav a{display:block;padding:8px 10px;border-radius:7px;color:var(--ink);
  font-size:14px;font-weight:550}
.drawernav a:hover{background:var(--subtle);text-decoration:none}

/* ── Theme menu ─────────────────────────────────────────────────────────────────────── */
.theme{position:relative;margin-left:16px}
.tbtn{display:inline-grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);
  border-radius:9px;background:var(--subtle);color:var(--muted);cursor:pointer;padding:0}
.tbtn:hover{color:var(--ink);border-color:var(--ink)}
.tmenu{position:absolute;top:calc(100% + 6px);right:0;min-width:130px;padding:5px;
  border:1px solid var(--line);border-radius:10px;background:var(--surface);
  box-shadow:0 12px 34px -12px rgba(15,17,21,.4);z-index:60}
.tmenu button{display:flex;align-items:center;justify-content:space-between;width:100%;
  border:0;border-radius:7px;background:none;color:var(--ink);cursor:pointer;
  font:inherit;font-size:13px;padding:7px 10px}
.tmenu button:hover{background:var(--subtle)}
.tmenu button[aria-checked=true]::after{content:"\2713";color:var(--brand);font-weight:700}

/* ── Search: a compact trigger in the header, a dialog over the page ─────────────────── */
.sbtn{display:inline-flex;align-items:center;gap:7px;min-height:34px;min-width:200px;
  border:1px solid var(--line);border-radius:9px;background:var(--subtle);
  color:var(--muted);cursor:pointer;font:inherit;font-size:13px;padding:0 11px}
.sbtn .sbtn-label{flex:1;text-align:left}
.sbtn:hover{color:var(--ink);border-color:var(--ink)}
.sbtn kbd{border:1px solid var(--line);border-radius:4px;font-family:inherit;font-size:11px;
  padding:1px 5px;color:var(--muted)}
#sdlg{position:fixed;inset:0;z-index:90}
#sdlg .sbackdrop{position:absolute;inset:0;background:rgba(15,17,21,.45)}
#sdlg .spanel{position:relative;width:min(640px,calc(100% - 32px));margin:9vh auto 0;
  border:1px solid var(--line);border-radius:12px;background:var(--surface);
  box-shadow:0 24px 70px -20px rgba(15,17,21,.5);padding:10px 10px 8px}
#sinput{width:100%;min-height:44px;border:0;outline:0;background:transparent;color:var(--ink);
  font:inherit;font-size:16px;padding:0 8px;border-bottom:1px solid var(--line)}
#sresults{list-style:none;margin:6px 0 0;padding:0;max-height:52vh;overflow-y:auto}
#sresults li{border-radius:8px;padding:9px 10px;cursor:pointer}
#sresults li.sel,#sresults li:hover{background:rgba(0,0,0,.05)}
#sresults .st{font-weight:600;font-size:14px}
#sresults .st small{color:var(--muted);font-weight:400;margin-left:8px}
#sresults .sx{color:var(--muted);font-size:13px;line-height:1.45;margin-top:2px}
#sresults mark{background:transparent;color:var(--ink);font-weight:650}
#sresults .snone{color:var(--muted);padding:12px 10px;font-size:14px}
.shint{margin:8px 2px 2px;color:var(--muted);font-size:12px}
.shint kbd{border:1px solid var(--line);border-radius:4px;padding:0 4px;font-family:inherit;font-size:11px}

@media (prefers-color-scheme:dark){
  :root{--canvas:#0d0e11;--surface:#131519;--subtle:#181a1f;--line:#24262d;--line-strong:#31343d;
        --ink:#e9eaee;--muted:#9a9ba4;--faint:#6f7078;
        --brand:#5b82ff;--brand-deep:#84a3ff;--brand-soft:#182444;}
}
:root[data-theme=dark]{--canvas:#0d0e11;--surface:#131519;--subtle:#181a1f;--line:#24262d;
  --line-strong:#31343d;--ink:#e9eaee;--muted:#9a9ba4;--faint:#6f7078;
  --brand:#5b82ff;--brand-deep:#84a3ff;--brand-soft:#182444;}
:root[data-theme=light]{--canvas:#fbfbfc;--surface:#fff;--subtle:#f7f7f9;--line:#e7e7eb;
  --line-strong:#d8d8df;--ink:#111317;--muted:#6f6f78;--faint:#9696a0;
  --brand:#285aff;--brand-deep:#1641d8;--brand-soft:#eff3ff;}
:root{color-scheme:light}
@media (prefers-color-scheme:dark){:root{color-scheme:dark}}
:root[data-theme=light]{color-scheme:light}
:root[data-theme=dark]{color-scheme:dark}

*{box-sizing:border-box}
body{margin:0;background:var(--canvas);color:var(--ink);font-family:var(--sans);
  font-size:16.5px;line-height:1.68;letter-spacing:-.003em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

header.top{position:sticky;top:0;z-index:30;background:var(--surface);
  border-bottom:1px solid var(--line);height:56px}
.header-inner{display:flex;align-items:center;gap:16px;height:100%;
  width:min(100%,var(--shell-max));margin:0 auto;padding:0 var(--gutter);box-sizing:border-box}
.brand{display:flex;align-items:center;gap:10px;font-weight:680;color:var(--ink);letter-spacing:-.01em}
/* Approved UHP mark: two raster images stacked in a fixed 30x30 box; the theme decides which is
   visible. visibility (not display) keeps the box reserved, so switching themes never shifts layout. */
.brand-mark{position:relative;width:30px;height:30px;flex:none}
.brand-logo{position:absolute;inset:0;width:30px;height:30px;display:block}
.logo-on-dark{visibility:hidden}                       /* default surface is light -> show the dark-ink mark */
@media (prefers-color-scheme:dark){
  :root:not([data-theme=light]) .logo-on-light{visibility:hidden}
  :root:not([data-theme=light]) .logo-on-dark{visibility:visible}
}
:root[data-theme=dark] .logo-on-light{visibility:hidden}
:root[data-theme=dark] .logo-on-dark{visibility:visible}
:root[data-theme=light] .logo-on-light{visibility:visible}
:root[data-theme=light] .logo-on-dark{visibility:hidden}
.brand .ver{font:500 11px/1 var(--mono);color:var(--muted);background:var(--subtle);
  border:1px solid var(--line);border-radius:999px;padding:4px 8px}
.ver{position:relative;margin-left:2px}
.verpill{display:inline-flex;align-items:center;gap:6px;cursor:pointer;
  font:500 11.5px/1 var(--mono);color:var(--muted);background:var(--subtle);
  border:1px solid var(--line);border-radius:999px;padding:5px 9px 5px 10px;white-space:nowrap}
.verpill:hover{color:var(--ink);border-color:var(--line-strong)}
.verpill[aria-expanded=true]{color:var(--ink);border-color:var(--ink)}
.verpill .dot{width:6px;height:6px;border-radius:50%;background:#16a34a;flex:none;
  box-shadow:0 0 0 3px rgba(22,163,74,.15)}
.verpill .vchev{opacity:.6;margin-left:1px}
.vmenu{position:absolute;top:calc(100% + 6px);left:0;min-width:190px;padding:5px;
  border:1px solid var(--line);border-radius:10px;background:var(--surface);
  box-shadow:0 12px 34px -12px rgba(15,17,21,.4);z-index:60}
.vmenu-h{margin:4px 8px 5px;font:660 10px/1 var(--sans);letter-spacing:.07em;
  text-transform:uppercase;color:var(--faint)}
.vmenu a{display:flex;align-items:center;gap:8px;border-radius:7px;padding:7px 9px;
  color:var(--ink);font:500 13px/1 var(--mono)}
.vmenu a:hover{background:var(--subtle);text-decoration:none}
.vmenu .vname{flex:1}
.vmenu .vtag{font:600 10px/1 var(--sans);letter-spacing:.03em;text-transform:uppercase;
  color:#16a34a;background:rgba(22,163,74,.12);border-radius:4px;padding:3px 6px}
.top .spacer{flex:1}
.top nav a{color:var(--muted);font-size:14px;font-weight:520;margin-left:18px}
.top nav a:hover{color:var(--ink);text-decoration:none}
#menu{display:none;background:none;border:1px solid var(--line);border-radius:8px;
  color:var(--ink);font-size:18px;line-height:1;padding:6px 10px;cursor:pointer}

.shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr) var(--toc);align-items:start;
  width:min(100%,var(--shell-max));margin:0 auto;padding:0 var(--gutter);box-sizing:border-box}
.shell.no-toc{grid-template-columns:var(--sidebar) minmax(0,1fr)}
.toc{position:sticky;top:56px;max-height:calc(100vh - 56px);overflow-y:auto;
  overscroll-behavior:contain;padding:40px 16px 48px 12px;scrollbar-width:thin}
.toc .toc-h{margin:0 0 8px;padding:0 10px;font:650 11px/1 var(--mono);
  letter-spacing:.02em;text-transform:uppercase;color:var(--faint)}
.toc ul{display:grid;gap:1px;margin:0;padding:0;list-style:none}
.toc a{display:flex;align-items:center;min-height:31px;padding:5px 10px;border-radius:7px;
  color:var(--muted);font-size:13px;line-height:1.35;text-decoration:none}
.toc a.lvl3{padding-left:22px;font-size:12.5px;color:var(--faint)}
.toc a:hover{color:var(--ink);background:var(--subtle)}
.toc a[aria-current=location]{color:var(--ink);font-weight:660}
.toc a.lvl3[aria-current=location]{color:var(--ink)}
aside{position:sticky;top:56px;height:calc(100vh - 56px);overflow-y:auto;
  border-right:1px solid var(--line);padding:24px 20px 48px 0}
.verbadge{display:flex;align-items:center;gap:8px;margin:0 6px 22px;padding:9px 11px;
  border:1px solid var(--line);border-radius:9px;background:var(--subtle)}
.verbadge .verlabel{font-size:11px;font-weight:660;letter-spacing:.07em;text-transform:uppercase;color:var(--faint)}
.verbadge .vertag{display:flex;align-items:center;gap:7px;margin-left:auto;
  font:600 12px/1 var(--mono);color:var(--ink)}
.verbadge .vertag em{font:500 10px/1 var(--sans);font-style:normal;letter-spacing:.03em;
  text-transform:uppercase;color:#16a34a;background:rgba(22,163,74,.12);border-radius:4px;padding:3px 6px}
.verbadge .dot{width:7px;height:7px;border-radius:50%;background:#16a34a;flex:none;
  box-shadow:0 0 0 3px rgba(22,163,74,.15)}
aside .group{margin-bottom:22px}
aside .group h4{margin:0 0 8px;padding:0 10px;font-size:11px;font-weight:660;
  letter-spacing:.07em;text-transform:uppercase;color:var(--faint)}
aside a{display:block;padding:6px 10px;border-radius:7px;color:var(--muted);
  font-size:14px;line-height:1.4}
aside a:hover{background:var(--subtle);color:var(--ink);text-decoration:none}
aside a.active{background:var(--brand-soft);color:var(--brand-deep);font-weight:600;box-shadow:inset 2px 0 0 var(--brand)}

main{padding:40px 40px 96px;min-width:0}
article{max-width:var(--content)}
article h1{font-family:var(--display);font-size:40px;line-height:1.12;letter-spacing:-.01em;
  margin:0 0 10px;font-weight:600}
article h2{font-family:var(--display);font-size:26px;line-height:1.25;letter-spacing:-.005em;
  margin:46px 0 14px;font-weight:600;padding-top:22px;border-top:1px solid var(--line)}
article h3{font-size:17px;margin:30px 0 8px;font-weight:640;letter-spacing:-.005em}
article p{margin:0 0 16px;color:var(--ink)}
article ul,article ol{margin:0 0 16px;padding-left:22px}
article li{margin:5px 0}
article strong{font-weight:640}
article img{max-width:100%;height:auto}

code{font-family:var(--mono);font-size:.875em;background:var(--subtle);
  border:1px solid var(--line);border-radius:5px;padding:1px 5px}
pre{background:var(--subtle);border:1px solid var(--line);border-radius:10px;
  padding:16px 18px;overflow-x:auto;margin:0 0 20px}
pre code{background:none;border:0;padding:0;font-size:13px;line-height:1.6}

.table-wrap{overflow-x:auto;margin:0 0 20px;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--subtle);font-weight:640;font-size:12.5px;letter-spacing:.02em;
  color:var(--muted);text-transform:uppercase}
tr:last-child td{border-bottom:0}
td code{white-space:nowrap}

blockquote{margin:0 0 20px;padding:14px 18px;background:var(--brand-soft);
  border-left:3px solid var(--brand);border-radius:0 10px 10px 0}
blockquote p:last-child{margin-bottom:0}

hr{border:0;border-top:1px solid var(--line);margin:32px 0}

.hero{padding:56px 0 8px;max-width:var(--content)}
.hero h1{font-family:var(--display);font-size:52px;line-height:1.06;letter-spacing:-.015em;font-weight:600;margin-bottom:16px}
.hero .lede{font-size:19px;color:var(--muted);line-height:1.55}
/* ── Homepage role flow: Client -> UHP server -> Harness (rendering of architecture Roles) ── */
.quicklinks{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:8px 0 40px;max-width:var(--content)}
@media (max-width:640px){.quicklinks{grid-template-columns:1fr}}
.home-h2{font-family:var(--display);font-size:20px;font-weight:600;margin:38px 0 4px;letter-spacing:-.005em}
.role-flow{display:flex;align-items:stretch;flex-wrap:wrap;gap:10px;margin:30px 0 14px}
.role-flow .node{display:flex;flex-direction:column;justify-content:center;gap:2px;
  border:1px solid var(--line);border-radius:12px;padding:12px 16px;background:var(--surface);min-width:0}
.role-flow .node b{font-size:14.5px;font-weight:640}
.role-flow .node small{color:var(--muted);font-size:12px}
.role-flow .arrow{align-self:center;color:var(--faint);flex:none}
.role-note{margin:0 0 6px;color:var(--muted);font-size:14px;max-width:var(--content)}
.card-badge{align-self:flex-start;font-size:11px;font-weight:660;letter-spacing:.02em;
  border-radius:6px;padding:3px 9px;margin-bottom:10px;background:var(--brand-soft);color:var(--brand-deep)}
.card-badge-quiet{background:var(--subtle);color:var(--muted)}
@media (max-width:560px){.role-flow .arrow{transform:rotate(90deg)}.role-flow{flex-direction:column}}
.cards-primary{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:30px 0 14px;max-width:var(--content)}
.card-lg{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;
  padding:22px;background:var(--surface);color:var(--ink);transition:border-color .15s,box-shadow .15s}
.card-lg:hover{border-color:var(--brand);text-decoration:none;box-shadow:0 6px 24px -14px var(--brand)}
.card-lg svg{color:var(--brand);margin-bottom:12px}
.card-lg b{font-size:17px;font-weight:640;margin-bottom:6px}
.card-lg span{color:var(--muted);font-size:14px;line-height:1.55;flex:1}
.card-lg em{margin-top:14px;font-style:normal;font-size:13.5px;font-weight:600;color:var(--brand)}
.cards-secondary{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0 0 8px;max-width:var(--content)}
.card-sm{display:block;border:1px solid var(--line);border-radius:11px;padding:14px 16px;
  background:transparent;color:var(--ink)}
.card-sm:hover{border-color:var(--brand);text-decoration:none;background:var(--subtle)}
.card-sm b{display:block;font-size:14.5px;font-weight:620;margin-bottom:3px}
.card-sm span{color:var(--muted);font-size:13px;line-height:1.5}
@media (max-width:640px){.cards-primary,.cards-secondary{grid-template-columns:1fr}}

.vnotice{margin:0 0 22px;padding:12px 16px;border:1px solid var(--line);border-left:3px solid var(--brand);
  border-radius:8px;background:var(--subtle);font-size:14px;color:var(--muted)}
.vnotice b{color:var(--ink)}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:56px;
  padding-top:20px;border-top:1px solid var(--line);max-width:var(--content)}
.pager a{font-size:14px;font-weight:560}
footer{border-top:1px solid var(--line);margin-top:64px;padding:24px 0 0;
  color:var(--faint);font-size:13px;max-width:var(--content)}

/* ── Tablet/below: sidebar becomes a drawer, top nav collapses into the drawer ───────── */
@media (max-width:960px){
  .shell,.shell.no-toc{grid-template-columns:1fr}
  .toc{display:none}
  aside{position:fixed;inset:56px auto 0 0;width:min(300px,84vw);background:var(--surface);
    transform:translateX(-100%);transition:transform .18s ease;z-index:25;height:calc(100vh - 56px)}
  aside.open{transform:none;box-shadow:0 12px 40px #0000001f}
  #menu{display:grid;place-items:center}
  main{padding:28px 20px 72px}
  /* Move the primary nav links into the drawer instead of dropping them entirely. */
  .top nav{display:none}
  aside .drawernav{display:block}
  .ver{display:none}
  /* Search shrinks to an icon-only button — same target, no dead label space. */
  .sbtn{min-width:0;width:34px;padding:0;justify-content:center}
  .sbtn-label,.sbtn kbd{display:none}
  article h1{font-size:30px}
  .hero h1{font-size:34px}
  .hero{padding:32px 0 4px}
}
/* ── Phone: keep the wordmark text (readable), tighten spacing ───────────────────────── */
@media (max-width:560px){
  header.top{gap:10px;padding:0 12px}
  .brand{font-size:15px;gap:8px}
  .theme{margin-left:8px}
  main{padding:22px 16px 64px}
}
/* ── Very narrow: drop the wordmark text, keep the mark (link stays labelled via aria-label) ─── */
@media (max-width:400px){
  .brand-name{display:none}
}