:root{
  --bg:#f6f7f9;--surface:#fff;--ink:#14202b;--muted:#5b6977;--line:#dfe4ea;--brand:#0f3d5e;--brand-2:#1d6fa5;
  --accent:#e8792b;--row:#f1f5f9;--hl:#fff4e6;--radius:10px;
  --sans:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;--mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0d141b;--surface:#141e28;--ink:#e6edf3;--muted:#9aa8b6;--line:#26333f;--brand:#7cc0f0;--brand-2:#9fd2f7;
  --accent:#f39a55;--row:#18242f;--hl:#3a2a17;}}
:root[data-theme="dark"]{--bg:#0d141b;--surface:#141e28;--ink:#e6edf3;--muted:#9aa8b6;--line:#26333f;--brand:#7cc0f0;--brand-2:#9fd2f7;--accent:#f39a55;--row:#18242f;--hl:#3a2a17}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--sans)}
a{color:var(--brand-2)}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
.sr{position:absolute;left:-9999px}
.mono,td{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* header */
.top{background:var(--brand);color:#fff;position:sticky;top:0;z-index:20}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .top{background:#0a2236}}
.bar{display:flex;align-items:center;gap:16px;min-height:58px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:inherit;text-decoration:none;letter-spacing:-.01em}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav a{color:#d7e6f2;text-decoration:none;padding:8px 10px;border-radius:6px;font-size:.92rem}
.nav a:hover,.nav a[aria-current]{background:rgba(255,255,255,.12);color:#fff}
.nav .nav-cta{background:var(--accent);color:#fff;font-weight:600}
.menu{display:none;margin-left:auto;background:none;border:1px solid rgba(255,255,255,.4);color:#fff;border-radius:6px;padding:6px 12px;font:inherit}
@media (max-width:900px){
  .menu{display:block}
  .nav{display:none;position:absolute;top:58px;left:0;right:0;background:var(--brand);flex-direction:column;align-items:stretch;padding:8px 16px 16px}
  .nav.open{display:flex}
}

/* type */
.crumbs{font-size:.85rem;color:var(--muted);margin:20px 0 4px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.6rem,4vw,2.4rem);line-height:1.15;letter-spacing:-.02em;margin:8px 0 12px}
h2{font-size:1.3rem;letter-spacing:-.01em}
.lede{font-size:1.08rem;color:var(--muted);max-width:780px}
.note{font-size:.9rem;color:var(--muted)}
.prose{max-width:780px;margin:32px 0}

/* home */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin:24px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--brand-2);transform:translateY(-2px)}
.card h2{font-size:1.08rem;margin:0 0 6px}
.card p{margin:0 0 12px;color:var(--muted);font-size:.93rem;flex:1}
.card span{color:var(--brand-2);font-weight:600;font-size:.9rem}
.search{display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px;max-width:780px}
.search select{flex:0 0 auto}
.search output{flex:1 1 220px;font-size:.95rem}

/* tables */
.tools{display:flex;gap:8px;margin:16px 0 8px;flex-wrap:wrap}
input,select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:9px 11px;min-width:0}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand-2);outline-offset:1px}
.filter{flex:1 1 220px;max-width:340px}
button{cursor:pointer}
.units{font:inherit;font-size:.9rem;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:8px 12px}
.tbl{overflow:auto;max-height:78vh;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:separate;border-spacing:0;width:100%;font-size:.88rem}
th{position:sticky;top:0;background:var(--brand);color:#fff;font:600 .8rem var(--sans);text-align:right;padding:10px 10px;white-space:nowrap;z-index:2}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) th{background:#0a2236}}
td{padding:8px 10px;text-align:right;white-space:nowrap;border-bottom:1px solid var(--line)}
th:first-child,td:first-child{text-align:left}
tbody tr:nth-child(even) td{background:var(--row)}
tbody tr:hover td{background:var(--hl)}
td.hl{background:var(--hl)!important}
.sticky1 td:first-child,.sticky1 th:first-child{position:sticky;left:0;z-index:1;background:var(--surface)}
.sticky1 th:first-child{z-index:3;background:var(--brand)}
.sticky1 tbody tr:nth-child(even) td:first-child{background:var(--row)}
td:nth-last-child(2):not(:first-child),td:last-child{white-space:normal}
.tbl td b{font-family:var(--sans)}

/* cta + ads */
.cta{display:flex;gap:20px;align-items:center;justify-content:space-between;background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#fff;border-radius:var(--radius);padding:20px 22px;margin:28px 0}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .cta{background:linear-gradient(120deg,#0a2236,#14466b)}}
.cta-k{font-weight:700;font-size:1.15rem;margin:0 0 4px}
.cta-t{margin:0;opacity:.9;font-size:.93rem;max-width:720px}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;border:0;border-radius:8px;padding:12px 18px;white-space:nowrap;font-size:1rem}
.btn:hover{filter:brightness(1.07)}
@media (max-width:640px){.cta{flex-direction:column;align-items:flex-start}}
.ad{margin:24px 0;min-height:100px}

/* faq */
.faq{max-width:780px;margin:32px 0}
details{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:8px 0}
summary{font-weight:600;cursor:pointer}
details p{margin:8px 0 0;color:var(--muted)}

/* calculator + form */
.calc,.rfq{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:20px 0;max-width:900px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.tabs button{font:inherit;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:999px;padding:7px 14px}
.tabs button[aria-selected="true"]{background:var(--brand);border-color:var(--brand);color:#fff}
.fields,.rfq{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.f{display:flex;flex-direction:column;gap:5px;font-size:.85rem;color:var(--muted);font-weight:500}
.f.wide{grid-column:1/-1}
.f[hidden]{display:none}
.result{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}
.result div{background:var(--bg);border-radius:8px;padding:12px}
.result span{display:block;font-size:.8rem;color:var(--muted)}
.result b{font:600 1.15rem var(--mono)}
@media (max-width:560px){.result{grid-template-columns:1fr}}
.rfq .btn{justify-self:start}
.hp{position:absolute;left:-9999px}

/* footer */
.foot{border-top:1px solid var(--line);margin-top:48px;padding:32px 0 16px;background:var(--surface);font-size:.9rem;color:var(--muted)}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.cols a{display:block;color:var(--muted);text-decoration:none;padding:3px 0}
.cols a:hover{color:var(--brand-2)}
.foot .brand{color:var(--ink)}
.fh{font-weight:600;color:var(--ink);margin:0 0 6px}
.copy{font-size:.8rem;margin-top:20px}
@media (max-width:760px){.cols{grid-template-columns:1fr 1fr}.cols>div:first-child{grid-column:1/-1}}
.wa{position:fixed;right:16px;bottom:16px;background:#1f9d55;color:#fff;text-decoration:none;font-weight:600;padding:12px 16px;border-radius:999px;box-shadow:0 6px 18px rgba(0,0,0,.2);z-index:30}
.card.sm{padding:14px}.card.sm h2{margin:0 0 2px}.card.sm p{margin:0}
.sizes{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
.kv td{text-align:left;white-space:normal}.kv td:first-child{white-space:nowrap;width:1%}
.pager{display:flex;justify-content:space-between;gap:12px;margin:24px 0;font-weight:600}
main>h1:first-child{margin-top:28px}

/* ---- v2 additions ---- */
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:8px 12px;z-index:99}
.skip:focus{left:8px;top:8px}
.acts{display:flex;align-items:center;gap:6px}
.icon-btn{background:none;border:0;color:#fff;padding:8px;border-radius:6px;display:grid;place-items:center}
.icon-btn:hover{background:rgba(255,255,255,.12)}
.bar .nav{margin-left:auto}
@media (max-width:900px){.acts{margin-left:auto}.menu{margin-left:0}}
.search-pop{position:fixed;inset:0;background:rgba(5,15,25,.55);z-index:50;display:flex;justify-content:center;align-items:flex-start;padding:10vh 16px 16px}
.search-pop[hidden]{display:none}
.search-box{background:var(--surface);border-radius:12px;width:100%;max-width:640px;padding:14px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.search-box input,.search.big input{width:100%;font-size:1.1rem;padding:12px 14px}
.search.big{max-width:640px}
.search-res{list-style:none;margin:10px 0 0;padding:0;max-height:60vh;overflow:auto}
.search-res a{display:block;padding:10px 12px;border-radius:8px;text-decoration:none;color:var(--ink)}
.search-res a:hover,.search-res a:focus{background:var(--row)}
.search-res b{display:block;font-weight:600}
.search-res span{display:block;font-size:.85rem;color:var(--muted)}
.search-res .none{padding:10px 12px;color:var(--muted)}
.related{margin:32px 0}
.rel{display:flex;flex-wrap:wrap;gap:8px}
.rel a{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:7px 14px;text-decoration:none;font-size:.9rem}
.rel a:hover{border-color:var(--brand-2)}
.updated{font-size:.8rem;color:var(--muted);margin-top:24px}
.pick{margin:14px 0 0;font-size:.95rem}
tr.ok td{background:color-mix(in srgb,#1f9d55 16%,var(--surface))!important}
.kv-t{border-collapse:collapse;margin:12px 0;font-size:.92rem;background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden;width:auto;min-width:min(100%,420px)}
.kv-t th{position:static;text-align:left}
.kv-t td{font-family:var(--sans);text-align:left;white-space:normal}
.prose h2,main>h2{margin-top:32px}
main>p,main>table{max-width:780px}
.gloss{max-width:860px}
.term{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:8px 0}
.term[hidden]{display:none}
.term dt{font-weight:700}.term dd{margin:4px 0 0;color:var(--muted)}
.tbl td a{text-decoration:none}
@media print{
  .top,.foot,.cta,.ad,.tools,.related,.faq,.wa,.crumbs,.pager,.search-pop{display:none!important}
  body{background:#fff;color:#000}.tbl{max-height:none;overflow:visible;border:0}
  th{position:static;background:#eee!important;color:#000!important}
}
:root[data-theme="dark"] .top,:root[data-theme="dark"] .nav{background:#0a2236}
:root[data-theme="dark"] th,:root[data-theme="dark"] .sticky1 th:first-child{background:#0a2236}
:root[data-theme="dark"] .cta{background:linear-gradient(120deg,#0a2236,#14466b)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .nav,:root:not([data-theme="light"]) .sticky1 th:first-child{background:#0a2236}}
.kv td{font-family:var(--sans)}
.kv td:first-child{white-space:normal;width:50%;color:var(--muted)}
.kv td:last-child{font-family:var(--mono);color:var(--ink)}
/* ---- batch 3 ---- */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:.88rem;text-decoration:none}
.chip:hover{border-color:var(--brand-2)}
.cmp td{text-align:left;white-space:normal;font-family:var(--sans);min-width:130px}
.cmp td:first-child{font-weight:600;min-width:150px}
.cmp th{text-align:left}
.bars{margin:16px 0}
.bar-row{display:grid;grid-template-columns:minmax(110px,180px) 1fr auto;gap:10px;align-items:center;margin:6px 0;font-size:.88rem}
.bar-track{position:relative;height:18px;background:var(--row);border-radius:4px;overflow:hidden}
.bar-track i{position:absolute;left:0;top:0;bottom:0;border-radius:4px}
.b-ts{background:color-mix(in srgb,var(--brand-2) 35%,transparent)}
.b-ys{background:var(--brand-2)}
.bar-row em{font-style:normal;font-family:var(--mono);font-size:.82rem;color:var(--muted)}
.lg{display:inline-block;width:12px;height:12px;border-radius:3px;vertical-align:-1px}
.lg-ys{background:var(--brand-2)}.lg-ts{background:color-mix(in srgb,var(--brand-2) 35%,transparent)}
.pts{max-width:780px}.pts li{margin:6px 0}
@media (max-width:560px){.bar-row{grid-template-columns:1fr}.bar-row em{justify-self:start}}
.std td{white-space:normal;text-align:left;font-family:var(--sans)}
.std td:first-child{white-space:nowrap}
.std tr:target td{background:var(--hl)!important}
.std th{text-align:left}