:root{
  --bg:#f7f8fa;--surface:#fff;--ink:#14171c;--muted:#5b6470;--line:#dde1e7;--accent:#1456a8;--accent-ink:#fff;
  --soft:#eef3fa;--mint:#c8f5e6;--mint-ink:#0b5a42;--warn:#fff6dc;--warn-ink:#6b4e00;--diff:#fff4cf;
  --radius:10px;--max:1120px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f1216;--surface:#171b21;--ink:#e8ebef;--muted:#9aa4b0;--line:#2a313a;--accent:#7db4f2;--accent-ink:#0b1220;
    --soft:#1a2431;--mint:#0f3a2d;--mint-ink:#9be8cb;--warn:#2d2610;--warn-ink:#f0d98a;--diff:#3a3210}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--font)}
img{max-width:100%;height:auto}
a{color:var(--accent);text-underline-offset:2px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;border:1px solid var(--line);z-index:100}
.skip:focus{left:8px}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em;margin:1.6em 0 .5em}
h1{font-size:clamp(1.7rem,4vw,2.4rem);margin-top:.2em}
h2{font-size:1.4rem}
h3{font-size:1.1rem}
p{margin:.6em 0}
.small{font-size:.875rem;color:var(--muted)}
.lead{font-size:1.1rem;color:var(--muted);max-width:68ch}
.eyebrow{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:700;margin:0}

/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.bar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.brand{display:inline-flex;background:#fff;border-radius:8px;padding:2px 6px;flex:none}
.brand img{display:block;height:40px;width:auto}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--ink);padding:8px 14px;border-radius:8px;font:inherit;cursor:pointer}
.menu{display:flex;align-items:center;gap:14px;flex:1;flex-wrap:wrap;justify-content:flex-end}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a,.nav-tool{color:var(--ink);text-decoration:none;padding:6px 10px;border-radius:8px;font-size:.92rem}
.nav a:hover,.nav-tool:hover{background:var(--soft)}
.nav-tools{display:flex;gap:4px}
.nav-tool{border:1px solid var(--line);font-weight:600}
.search{position:relative;display:flex;gap:6px}
.search input,.hero-search input{font:inherit;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);min-width:0}
.search input{width:230px}
button,.btn{font:inherit}
.search button,.hero-search button{padding:8px 14px;border:0;border-radius:8px;background:var(--accent);color:var(--accent-ink);font-weight:600;cursor:pointer}
.suggest{position:absolute;top:100%;left:0;right:0;margin:4px 0 0;padding:4px;list-style:none;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.12);z-index:60;max-height:340px;overflow:auto}
.suggest a{display:block;padding:8px 10px;border-radius:6px;color:var(--ink);text-decoration:none;font-size:.92rem}
.suggest a small{color:var(--muted);display:block}
.suggest a:hover,.suggest a.on{background:var(--soft)}

/* crumbs */
.crumbs{padding:14px 0 0;font-size:.85rem}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px}
.crumbs li+li::before{content:"›";margin-right:4px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.crumbs [aria-current]{color:var(--ink)}

/* hero / head */
.hero{padding:40px 0 16px}
.hero h1{max-width:20ch}
.hero-search{display:flex;gap:8px;max-width:640px;margin:20px 0}
.hero-search input{flex:1;padding:12px 14px;font-size:1rem}
.hero-links{display:flex;flex-wrap:wrap;gap:10px}
.page-head{padding:12px 0 4px}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);text-decoration:none;padding:10px 18px;border-radius:8px;font-weight:600}
.btn:hover{filter:brightness(1.1)}
.btn-ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn-sm{background:var(--surface);color:var(--ink);border:1px solid var(--line);padding:7px 12px;border-radius:8px;cursor:pointer;font-size:.9rem}
.btn-sm:hover{background:var(--soft)}
.btn-link{font-weight:600}

/* cards */
.cards{list-style:none;padding:0;margin:16px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.card a{display:block;padding:16px;color:inherit;text-decoration:none;height:100%}
.card:hover{border-color:var(--accent)}
.card h2,.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;color:var(--muted);font-size:.9rem}
.card .count{display:inline-block;margin-top:10px;font-size:.78rem;background:var(--soft);color:var(--accent);padding:2px 8px;border-radius:99px;font-weight:600}
.pairs{list-style:none;padding:0;margin:12px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}
.pair{display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;color:var(--ink);text-decoration:none;font-size:.92rem}
.pair:hover{border-color:var(--accent)}
.pair b{color:var(--accent)}
.pair span{flex:1;min-width:0}
.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.chips{list-style:none;padding:0;margin:10px 0;display:flex;flex-wrap:wrap;gap:8px}
.chips a{display:inline-block;background:var(--surface);border:1px solid var(--line);border-radius:99px;padding:5px 12px;font-size:.88rem;text-decoration:none}
.chips a:hover{border-color:var(--accent)}
.bul{padding-left:1.2em}
.bul li{margin:.3em 0}

/* item */
.item-head{padding-top:8px}
.pills{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.pill{background:var(--soft);color:var(--accent);padding:2px 10px;border-radius:99px;font-size:.8rem;font-weight:600}
.toc{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0;overflow-x:auto}
.toc a{padding:5px 12px;border:1px solid var(--line);border-radius:99px;font-size:.85rem;text-decoration:none;color:var(--ink);background:var(--surface);white-space:nowrap}
.tag{display:inline-block;font-size:.7rem;font-weight:700;padding:1px 8px;border-radius:99px;vertical-align:middle;letter-spacing:.02em}
.tag-of{background:var(--mint);color:var(--mint-ink)}
.tag-ed{background:var(--warn);color:var(--warn-ink)}
.source{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:4px 18px 12px;margin:20px 0}
.source h2{font-size:1.05rem;margin:.8em 0 .2em}
.expl{margin:12px 0}
.expl>div{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:10px 14px;margin:8px 0}
.expl dt{font-weight:700;font-size:.95rem}
.expl dd{margin:2px 0 0;color:var(--muted);font-size:.92rem}
.val{color:var(--accent)}
.cta{margin:28px 0}

/* tables */
.tbl-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.spec{border-collapse:collapse;width:100%;font-size:.93rem}
.spec th,.spec td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.spec thead th{background:var(--soft);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);position:sticky;top:0}
.spec tbody th{font-weight:600;width:34%}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}
.spec tbody tr:hover{background:color-mix(in srgb,var(--soft) 55%,transparent)}
.c-tag{width:1%;white-space:nowrap}
.list tbody th{width:auto}
.cmp-mini tbody th{width:28%}

/* filters / tools */
.filters,.tool-row{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin:16px 0}
.fl,.tool label{display:flex;flex-direction:column;gap:4px;font-size:.82rem;font-weight:600;color:var(--muted)}
.fl.grow{flex:1;min-width:220px}
.filters input,.filters select,.tool select{font:inherit;font-weight:400;padding:9px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);min-width:170px;max-width:100%}
.count{margin:0 0 0 auto;font-size:.88rem;color:var(--muted)}
.tool{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:8px 18px 18px;margin:16px 0}
.tool-row.opts{align-items:center}
.chk{flex-direction:row!important;align-items:center;gap:8px!important;font-weight:500!important;color:var(--ink)!important}
.empty,.notice{background:var(--soft);padding:14px;border-radius:8px;color:var(--muted)}
.cmp-head th{vertical-align:bottom;font-size:1rem;text-transform:none;letter-spacing:0;color:var(--ink)}
.cmp tbody tr.diff th,.cmp tbody tr.diff td{background:var(--diff)}
.cmp .grp th{background:var(--soft);font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.diffmark{font-size:.7rem;font-weight:700;color:var(--warn-ink);background:var(--warn);padding:1px 6px;border-radius:99px;margin-left:6px}
.results .card a h3{font-size:1rem}
.results .meta{font-size:.82rem;color:var(--muted);margin-top:6px}

/* prose */
.prose{max-width:72ch}

/* footer */
.site-footer{margin-top:64px;border-top:1px solid var(--line);background:var(--surface);padding:32px 0 24px}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.foot h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 8px}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin:4px 0}
.foot a{text-decoration:none;color:var(--ink)}
.foot a:hover{text-decoration:underline}
.foot-logo{background:#fff;border-radius:8px;padding:2px 6px}
.copy{margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}

@media (min-width:861px){
  .bar{gap:12px 20px;padding-top:12px;padding-bottom:0}
  .menu{display:contents}
  .brand{order:1}
  .search{order:2;flex:1;max-width:520px;margin-left:auto}
  .search input{flex:1;width:auto}
  .nav-tools{order:3}
  .nav{order:4;flex-basis:100%;border-top:1px solid var(--line);padding:6px 0;gap:2px}
  .nav a{padding:6px 12px}
}
@media (max-width:860px){
  .menu-btn{display:block}
  .menu{display:none;flex-basis:100%;flex-direction:column;align-items:stretch;gap:10px;padding-bottom:10px}
  .menu.open{display:flex}
  .nav{flex-direction:column}
  .nav-tools{flex-direction:column}
  .search input{width:100%;flex:1}
  .two,.foot{grid-template-columns:1fr}
  .count{margin-left:0}
}
@media (max-width:640px){
  .brand img{height:32px}
  .stack thead{display:none}
  .stack,.stack tbody,.stack tr,.stack th,.stack td{display:block;width:100%}
  .stack tr{padding:10px 14px;border-bottom:1px solid var(--line)}
  .stack th,.stack td{border:0;padding:2px 0}
  .stack td::before,.stack tbody th:not([scope=row])::before{content:attr(data-label) ": ";color:var(--muted);font-size:.82rem}
  .stack tbody th[scope=row]{font-size:1rem;margin-bottom:4px}
  .stack tbody th[scope=row]::before{content:""}
  .spec.cmp td,.spec.cmp th{padding:8px 8px;font-size:.85rem}
  .spec.cmp tbody th{width:32%}
  .hero{padding-top:20px}
  .hero-search{flex-direction:column}
  .tool{padding:4px 12px 14px}
  .filters input,.filters select,.tool select{min-width:0;width:100%}
  .tool-row label{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.site-header,.site-footer,.toc,.tool-row{display:none}}