/* ==========================================================================
   XinYonSen B2B site — "technical dossier" visual system
   Palette: warm paper, graphite ink, teal signal, rust marker.
   No external fonts, no CDN, no cookies.
   ========================================================================== */

:root{
  --paper:#F2EEE4;
  --paper-2:#E7E0D0;
  --white:#FBF9F3;
  --ink:#101A21;
  --ink-2:#23323B;
  --muted:#5A686F;
  --line:#C8BFAD;
  --line-2:#AFA593;
  --teal:#0B6E82;
  --teal-2:#0E8AA3;
  --cyan:#12A8C4;
  --rust:#B3542C;
  --steel:#7A868D;
  --sans:-apple-system,"Segoe UI Variable","Segoe UI",system-ui,Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:"Cascadia Mono",Consolas,ui-monospace,"SF Mono",Menlo,monospace;
  --max:1280px;
  --gut:clamp(18px,4vw,56px);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  font-feature-settings:"kern";
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(to right,rgba(16,26,33,.035) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(16,26,33,.035) 1px,transparent 1px);
  background-size:64px 64px;
  opacity:.55;
}

img{max-width:100%;height:auto;display:block}
a{color:var(--teal);text-decoration:none;text-underline-offset:3px}
a:hover{text-decoration:underline;text-decoration-thickness:1px}
p{margin:0 0 1em}
strong{font-weight:650}
hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}

h1,h2,h3,h4{
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.06;
  margin:0 0 .5em;
  text-wrap:balance;
}
h1{font-size:clamp(2.1rem,4.6vw,3.9rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.3rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.35rem);line-height:1.2}
h4{font-size:1rem;letter-spacing:0}

.skip{
  position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--white);
  padding:10px 16px;z-index:20;
}
.skip:focus{left:12px;top:12px}

:focus-visible{outline:2px solid var(--rust);outline-offset:3px}

.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gut);position:relative;z-index:1}
.narrow{max-width:820px}
.tight{max-width:640px}

/* ---------- typographic atoms ---------- */
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.eyebrow{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--rust);
  display:flex;align-items:center;gap:.7em;
  margin:0 0 1.1em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--rust);flex:none}
.lede{
  font-size:clamp(1.02rem,1.35vw,1.2rem);
  line-height:1.55;
  color:var(--ink-2);
  max-width:62ch;
  margin:0 0 1.4em;
}
.small{font-size:.86rem;color:var(--muted)}
.muted{color:var(--muted)}
.mt-0{margin-top:0}

/* ---------- top strip ---------- */
.topbar{
  background:var(--ink);
  color:#D8D2C4;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.topbar .wrap{
  display:flex;justify-content:space-between;gap:1em;align-items:center;
  min-height:34px;flex-wrap:wrap;
}
.topbar a{color:#D8D2C4}
.topbar .tb-right{display:flex;gap:1.4em;flex-wrap:wrap}
.topbar .tb-right a:hover{color:var(--cyan);text-decoration:none}

/* ---------- header ---------- */
.hdr{
  position:sticky;top:0;z-index:12;
  background:rgba(242,238,228,.96);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(6px);
}
.hdr .wrap{display:flex;align-items:center;gap:clamp(12px,2vw,28px);min-height:74px}
.brand{display:flex;align-items:center;gap:12px;flex:none;color:var(--ink);text-decoration:none}
.brand img{width:auto;height:36px}
.brand .bt{
  display:flex;flex-direction:column;line-height:1.1;
  font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;
  font-family:var(--mono);color:var(--muted);border-left:1px solid var(--line);padding-left:12px;
}
.brand .bt b{color:var(--ink);font-family:var(--sans);font-size:.86rem;letter-spacing:0;text-transform:none;font-weight:700}
.brand:hover{text-decoration:none}

.nav{display:flex;gap:0;margin-left:auto;align-items:center}
.nav-item{position:relative}
.nav-btn{
  appearance:none;border:0;background:none;cursor:pointer;
  font-family:var(--sans);font-size:.84rem;font-weight:600;letter-spacing:-.01em;
  color:var(--ink);padding:10px clamp(8px,1vw,14px);
  display:flex;align-items:center;gap:6px;border-bottom:2px solid transparent;
}
.nav-btn:hover,.nav-btn[aria-expanded="true"]{border-bottom-color:var(--rust)}
.nav-btn .chev{width:7px;height:7px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px);opacity:.55}
a.nav-btn{text-decoration:none}
.nav-panel{
  position:absolute;top:calc(100% + 1px);right:0;min-width:352px;
  background:var(--white);border:1px solid var(--line);border-top:2px solid var(--ink);
  padding:10px;display:none;box-shadow:0 18px 40px rgba(16,26,33,.13);
  max-height:70vh;overflow:auto;
}
.nav-panel[data-open="true"]{display:block}
.nav-panel a{
  display:flex;justify-content:space-between;gap:14px;align-items:baseline;
  padding:9px 10px;color:var(--ink);font-size:.86rem;line-height:1.35;text-decoration:none;border-bottom:1px solid rgba(200,191,173,.5);
}
.nav-panel a:last-child{border-bottom:0}
.nav-panel a:hover{background:var(--paper);text-decoration:none}
.nav-panel a .k{font-family:var(--mono);font-size:.62rem;color:var(--steel);letter-spacing:.08em;flex:none;white-space:nowrap;text-align:right}
.nav-panel .np-head{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);padding:6px 10px 8px;
}

.hdr-actions{display:flex;align-items:center;gap:8px;flex:none}
.icon-btn{
  appearance:none;background:none;border:1px solid var(--line);cursor:pointer;
  width:38px;height:38px;display:grid;place-items:center;color:var(--ink);
}
.icon-btn:hover{border-color:var(--ink)}
.icon-btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.6}

.btn{
  --bg:var(--ink);--fg:var(--white);--bd:var(--ink);
  appearance:none;cursor:pointer;display:inline-flex;align-items:center;gap:10px;
  background:var(--bg);color:var(--fg);border:1px solid var(--bd);
  font-family:var(--sans);font-size:.85rem;font-weight:650;letter-spacing:.01em;
  padding:12px 20px;text-decoration:none;line-height:1.2;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px));
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-rust{--bg:var(--rust);--bd:var(--rust);--fg:#fff}
.btn-rust:hover{--bg:#983F1C;--bd:#983F1C}
.btn-ghost{--bg:transparent;--fg:var(--ink);--bd:var(--ink-2)}
.btn-ghost:hover{--bg:var(--ink);--fg:var(--white)}
.btn-sm{padding:9px 15px;font-size:.78rem}
.btn-block{width:100%;justify-content:center}

/* ---------- hero ---------- */
.hero{padding:clamp(38px,6vw,84px) 0 clamp(30px,4vw,54px);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,64px);align-items:end}
.hero h1{margin-bottom:.35em;max-width:14ch}
.hero .lede{max-width:44ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:1.6em}
.hero-fig{position:relative}
.hero-fig img{width:100%;aspect-ratio:16/9;object-fit:cover;filter:saturate(.86) contrast(1.03)}
.hero-fig .dim-l{
  position:absolute;left:0;right:0;top:auto;bottom:-1px;height:1px;background:var(--ink);opacity:.7;
}
.hero-fig .cap{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);padding-top:10px;display:flex;justify-content:space-between;gap:1em;
}
.hero-fig .tick{position:absolute;width:1px;height:9px;background:var(--ink);opacity:.7}
.hero-fig .tick.a{left:0;bottom:-5px}
.hero-fig .tick.b{right:0;bottom:-5px}

/* ---------- data plate ---------- */
.plate{
  border-top:1px solid var(--ink);border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:repeat(4,1fr);margin:clamp(28px,4vw,46px) 0 0;
}
.plate > div{padding:18px 18px 20px;border-left:1px solid var(--line)}
.plate > div:first-child{border-left:0;padding-left:0}
.plate dt{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.5em}
.plate dd{margin:0;font-family:var(--mono);font-size:clamp(1.15rem,2vw,1.6rem);letter-spacing:-.02em;font-weight:600}
.plate dd small{font-size:.62em;color:var(--muted);letter-spacing:0;font-weight:400}

/* ---------- sections ---------- */
section{padding:clamp(36px,4.2vw,64px) 0}
.bd{border-top:1px solid var(--line)}
.bd-dark{border-top:1px solid #33424C}

.sec-head{display:grid;grid-template-columns:64px 1fr;gap:clamp(8px,2vw,26px);margin-bottom:clamp(24px,3.4vw,44px);align-items:start}
.sec-idx{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;color:var(--rust);padding-top:.4em;
  border-top:1px solid var(--rust);display:block;
}
.sec-head h2{margin-bottom:.3em;max-width:24ch}
.sec-head p{max-width:64ch;color:var(--ink-2);margin:0;font-size:.97rem}
.sec-head .sh-link{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;display:inline-block;margin-top:1em}

/* ---------- module grid ---------- */
.grid{display:grid;gap:0;background:transparent;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.grid > *{border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.mod{
  background:var(--white);padding:clamp(18px,2.4vw,28px);position:relative;
  display:flex;flex-direction:column;gap:.6em;min-height:100%;
  transition:background .18s ease;
}
.mod:hover{background:#fff}
.mod .mi{font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;color:var(--steel)}
.mod h3{margin:.1em 0 .2em}
.mod p{font-size:.9rem;color:var(--muted);margin:0}
.mod .more{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  margin-top:auto;padding-top:1em;color:var(--teal);display:flex;align-items:center;gap:.6em;
}
.mod .more::after{content:"";width:18px;height:1px;background:currentColor}
.mod a.stretch{position:absolute;inset:0;text-indent:-9999px;overflow:hidden}
.mod:hover{border-color:var(--teal)}
.mod:hover .more{color:var(--rust)}

/* numbered list of links */
.linklist{border-top:1px solid var(--ink);margin:0;padding:0;list-style:none}
.linklist li{border-bottom:1px solid var(--line)}
.linklist a{
  display:grid;grid-template-columns:56px 1fr auto;gap:16px;align-items:baseline;
  padding:14px 4px;color:var(--ink);text-decoration:none;font-size:.95rem;
}
.linklist a .n{font-family:var(--mono);font-size:.66rem;color:var(--steel);letter-spacing:.08em}
.linklist a .t{font-weight:600}
.linklist a .d{font-size:.82rem;color:var(--muted);font-weight:400;margin-top:2px;display:block}
.linklist a .ar{font-family:var(--mono);font-size:.7rem;color:var(--rust)}
.linklist a:hover{background:rgba(255,253,248,.7);text-decoration:none}
.linklist a:hover .t{text-decoration:underline;text-underline-offset:3px}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);background:var(--white)}
table.tbl{width:100%;border-collapse:collapse;font-size:.88rem}
table.tbl caption{
  text-align:left;font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);padding:12px 14px;border-bottom:1px solid var(--line);
}
table.tbl th,table.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid rgba(200,191,173,.6);vertical-align:top}
table.tbl thead th{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-2);background:var(--paper-2);border-bottom:1px solid var(--line-2);white-space:nowrap;
}
table.tbl td.num,table.tbl th.num{font-family:var(--mono);font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap}
table.tbl tbody tr:last-child td{border-bottom:0}
table.tbl tbody tr:hover td{background:rgba(242,238,228,.6)}
table.tbl td strong{font-weight:650}

/* ---------- prose ---------- */
.prose{max-width:72ch}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.2em}
.prose li{margin-bottom:.45em}
.prose li::marker{color:var(--rust)}
.prose blockquote{
  margin:1.6em 0;padding:2px 0 2px 18px;border-left:2px solid var(--rust);
  font-size:1.02rem;color:var(--ink-2);
}
.prose code{
  font-family:var(--mono);font-size:.86em;background:var(--paper-2);padding:.12em .35em;
}

.note{
  border:1px solid var(--line);border-left:3px solid var(--teal);
  background:var(--white);padding:16px 18px;margin:1.8em 0;font-size:.92rem;
}
.note h4{margin:0 0 .4em;font-size:.72rem;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--teal)}
.note.warn{border-left-color:var(--rust)}
.note.warn h4{color:var(--rust)}
.note p:last-child{margin-bottom:0}

.tagrow{display:flex;flex-wrap:wrap;gap:8px;margin:1.2em 0}
.tag{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;
  border:1px solid var(--line-2);padding:4px 9px;color:var(--ink-2);background:var(--white);
}

/* ---------- spec sheet ---------- */
.sheet{
  background:var(--white);border:1px solid var(--ink);margin:2em 0;
}
.sheet-head{
  display:flex;justify-content:space-between;gap:1em;flex-wrap:wrap;
  padding:14px 18px;border-bottom:1px solid var(--ink);background:var(--paper-2);
  font-family:var(--mono);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);
}
.sheet-body{display:grid;grid-template-columns:1fr 1fr}
.sheet-body > div{padding:16px 18px}
.sheet-body > div + div{border-left:1px solid var(--line)}
.sheet dl{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:0;font-size:.85rem}
.sheet dt{color:var(--muted)}
.sheet dd{margin:0;font-family:var(--mono);text-align:right}
.sheet-foot{
  border-top:1px solid var(--line);padding:10px 18px;font-family:var(--mono);
  font-size:.6rem;letter-spacing:.1em;text-transform:uppercase;color:var(--steel);
  display:flex;justify-content:space-between;gap:1em;flex-wrap:wrap;
}

/* ---------- CTA band ---------- */
.cband{
  background:var(--ink);color:#EDE8DC;position:relative;overflow:hidden;
  border-top:1px solid #3A4952;
}
.cband::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(to right,rgba(237,232,220,.06) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(237,232,220,.06) 1px,transparent 1px);
  background-size:44px 44px;
  pointer-events:none;
}
.cband .wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(20px,4vw,60px);align-items:center;position:relative}
.cband h2{color:#FBF9F3;max-width:22ch}
.cband p{color:#C6C1B4;margin-bottom:0;max-width:52ch}
.cband .eyebrow{color:var(--cyan)}
.cband .eyebrow::before{background:var(--cyan)}
.cband .acts{display:flex;flex-direction:column;gap:10px;align-items:stretch}
.cband .btn-ghost{--fg:#EDE8DC;--bd:#6B7A83}
.cband .btn-ghost:hover{--bg:#FBF9F3;--fg:var(--ink);--bd:#FBF9F3}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.step{background:var(--white);padding:22px 20px 26px;position:relative}
.step .sn{font-family:var(--mono);font-size:1.6rem;color:var(--line-2);line-height:1;letter-spacing:-.03em}
.step h3{font-size:1rem;margin:.6em 0 .4em}
.step p{font-size:.86rem;color:var(--muted);margin:0}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--ink);margin-top:1.6em}
.faq details{border-bottom:1px solid var(--line);padding:2px 0}
.faq summary{
  cursor:pointer;padding:16px 34px 16px 0;font-weight:600;font-size:.96rem;position:relative;list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";position:absolute;right:6px;top:14px;font-family:var(--mono);font-size:1.1rem;color:var(--rust);
}
.faq details[open] summary::after{content:"−"}
.faq details > div{padding:0 0 18px;font-size:.92rem;color:var(--ink-2);max-width:76ch}

/* ---------- breadcrumb ---------- */
.crumb{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);padding:16px 0 0;
}
.crumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.6em;margin:0;padding:0}
.crumb li{display:flex;gap:.6em;align-items:center}
.crumb li + li::before{content:"/";color:var(--line-2)}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--rust)}
.crumb [aria-current="page"]{color:var(--ink)}

/* ---------- page header ---------- */
.phead{padding:clamp(26px,3vw,44px) 0 clamp(26px,3.4vw,44px);border-bottom:1px solid var(--line)}
.phead .ph-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:clamp(20px,4vw,56px);align-items:start;margin-top:clamp(14px,2vw,26px)}
.phead h1{font-size:clamp(1.9rem,3.6vw,3.1rem);max-width:22ch}
.phead .lede{margin-bottom:1.2em}
.phead .ph-side{border-left:1px solid var(--line);padding-left:clamp(14px,2vw,26px)}
.phead .ph-side dl{display:grid;grid-template-columns:1fr auto;gap:8px 14px;margin:0;font-size:.82rem}
.phead .ph-side dt{color:var(--muted)}
.phead .ph-side dd{margin:0;font-family:var(--mono);text-align:right}
.phead .ph-side h4{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--rust);margin-bottom:.9em}

/* ---------- split content ---------- */
.split{display:grid;grid-template-columns:1.55fr .45fr;gap:clamp(26px,4vw,60px);align-items:start}
.aside{position:sticky;top:96px;display:flex;flex-direction:column;gap:14px}
.aside .box{border:1px solid var(--line);background:var(--white);padding:18px}
.aside .box h4{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--rust);margin-bottom:.8em}
.aside .box p,.aside .box li{font-size:.85rem;color:var(--ink-2)}
.aside .box ul{margin:0;padding-left:1.1em}
.aside .box .btn{margin-top:.6em}

/* ---------- figure ---------- */
figure{margin:0}
.fig-cap{font-family:var(--mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding-top:8px;display:flex;justify-content:space-between;gap:1em}
figure img{width:100%}
.frame{border:1px solid var(--line);background:var(--white);padding:8px;position:relative}
.hero-fig .frame{border:0;background:none;padding:0}

/* ---------- small static figures side by side (QR codes) ---------- */
.figrow.qrgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,196px));
  justify-content:start;gap:20px;margin:10px 0 4px}
.qrgrid .frame{padding:10px;background:#fff;display:flex;align-items:center;justify-content:center}
.qrgrid .frame img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#fff}
.qrgrid .fig-cap{font-size:.6rem;white-space:nowrap}

/* ---------- image interaction: lens + scene wipe ---------- */
.fx{position:absolute;overflow:hidden;pointer-events:none;z-index:2}
.fx-scene{position:absolute;inset:0;clip-path:inset(0 0 0 100%)}
.fx-scene img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:saturate(.86) contrast(1.03)}
.fx-seam{position:absolute;top:0;bottom:0;width:1px;background:#FBF9F3;opacity:0;
  box-shadow:0 0 0 1px rgba(16,26,33,.18);transition:opacity .15s ease}
.fx-lens{position:absolute;width:168px;height:168px;border-radius:50%;overflow:hidden;
  border:2px solid rgba(251,249,243,.92);box-shadow:0 12px 34px rgba(16,26,33,.3);
  opacity:0;transition:opacity .18s ease;left:0;top:0;background:var(--paper)}
.fx-lens img{position:absolute;left:0;top:0;max-width:none;width:100%;height:100%;
  object-fit:cover;will-change:transform}
.fx-tag{position:absolute;left:10px;bottom:10px;max-width:calc(100% - 20px);
  background:var(--ink);color:#FBF9F3;font-family:var(--mono);font-size:.6rem;
  letter-spacing:.1em;text-transform:uppercase;padding:6px 10px;opacity:0;
  transition:opacity .2s ease;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fx-tag b{font-weight:400;color:var(--cyan)}
.fx-mark{position:absolute;right:10px;top:10px;background:rgba(16,26,33,.72);color:#F2EEE4;
  font-family:var(--mono);font-size:.56rem;letter-spacing:.12em;text-transform:uppercase;
  padding:4px 8px;transition:opacity .2s ease}
.frame.is-live .fx-mark{opacity:0}
.frame.is-live .fx-lens,.frame.is-live .fx-tag,.frame.is-live .fx-seam{opacity:1}
@media (hover:none),(prefers-reduced-motion:reduce){.fx{display:none !important}}

/* ---------- tabs ---------- */
.tabs{display:flex;gap:0;border-bottom:1px solid var(--line);flex-wrap:wrap;margin-bottom:1.4em}
.tab{
  appearance:none;background:none;border:0;border-bottom:2px solid transparent;cursor:pointer;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
  padding:10px 14px;
}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--rust)}
.tabpanel[hidden]{display:none}

/* ---------- RFQ tray ---------- */
.tray{
  position:fixed;right:clamp(10px,2vw,24px);bottom:clamp(10px,2vw,20px);z-index:14;
  background:var(--ink);color:#F2EEE4;border:1px solid #3C4B54;
  box-shadow:0 14px 34px rgba(16,26,33,.26);
  width:min(340px,calc(100vw - 20px));
  transform:translateY(calc(100% + 24px));transition:transform .26s ease;
}
.tray[data-open="true"]{transform:none}
.tray-bar{
  display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;
}
.tray-bar .cnt{
  background:var(--rust);color:#fff;min-width:22px;height:22px;display:grid;place-items:center;
  font-size:.72rem;padding:0 6px;
}
.tray-bar .lbl{flex:1}
.tray-bar .car{width:8px;height:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(-135deg)}
.tray[data-open="true"] .tray-bar .car{transform:rotate(45deg)}
.tray-body{padding:0 14px 14px;display:none}
.tray[data-open="true"] .tray-body{display:block}
.tray-body ul{list-style:none;margin:0 0 12px;padding:0;max-height:180px;overflow:auto;border-top:1px solid #3C4B54}
.tray-body li{display:flex;gap:8px;justify-content:space-between;padding:8px 0;border-bottom:1px solid #28353D;font-size:.78rem}
.tray-body li button{background:none;border:0;color:#9FB0B8;cursor:pointer;font-family:var(--mono);font-size:.9rem;line-height:1}
.tray-body li button:hover{color:#F2EEE4}
.tray-body .empty{color:#9FB0B8;font-size:.78rem;padding:10px 0}
.tray-body .btn{width:100%;justify-content:center;font-size:.76rem;padding:10px}

/* ---------- search overlay ---------- */
.sov{
  position:fixed;inset:0;z-index:18;background:rgba(16,26,33,.55);
  display:none;padding:clamp(20px,8vh,90px) var(--gut);
}
.sov[data-open="true"]{display:block}
.sov-in{max-width:760px;margin:0 auto;background:var(--paper);border:1px solid var(--ink)}
.sov-top{display:flex;gap:10px;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line)}
.sov-top input{
  flex:1;appearance:none;border:0;background:transparent;font-size:1.05rem;font-family:var(--sans);color:var(--ink);
  padding:6px 0;
}
.sov-top input:focus{outline:none}
.sov-res{max-height:60vh;overflow:auto;padding:6px 0}
.sov-res a{display:block;padding:10px 16px;color:var(--ink);text-decoration:none;border-bottom:1px solid rgba(200,191,173,.5)}
.sov-res a:hover{background:var(--paper-2)}
.sov-res .rt{font-weight:600;font-size:.94rem}
.sov-res .rs{font-family:var(--mono);font-size:.62rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.sov-foot{padding:10px 16px;font-family:var(--mono);font-size:.62rem;color:var(--muted);letter-spacing:.08em;border-top:1px solid var(--line)}

/* ---------- forms ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2);margin-bottom:6px}
.field .hint{font-size:.76rem;color:var(--muted);margin-top:4px}
input[type=text],input[type=email],input[type=tel],input[type=number],input[type=search],select,textarea{
  width:100%;font-family:var(--sans);font-size:.94rem;color:var(--ink);
  background:var(--white);border:1px solid var(--line-2);padding:10px 12px;
  border-radius:1px;appearance:none;
}
select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235A686F'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--teal);outline-offset:1px;border-color:var(--teal)}
input[aria-invalid="true"],select[aria-invalid="true"],textarea[aria-invalid="true"]{border-color:var(--rust);background:#FBF1EC}
.err{display:block;font-size:.76rem;color:var(--rust);margin-top:5px;font-family:var(--mono)}
.err[hidden]{display:none}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.88rem;margin-bottom:12px}
.check input{width:16px;height:16px;margin-top:4px;flex:none}

/* ---------- tube weight calculator ---------- */
.calc{max-width:760px;border-top:1px solid var(--ink);padding-top:4px}
.calcrow{
  display:grid;grid-template-columns:minmax(0,1fr) 190px;gap:clamp(12px,2vw,28px);
  align-items:center;padding:9px 0;border-bottom:1px solid var(--line);
}
.calcrow[hidden]{display:none}
.calcrow label{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2)}
.calcrow input,.calcrow select{padding:6px 10px;font-family:var(--mono);font-size:.86rem;text-align:right}
.calcrow select{text-align:left}
.calc-out{border:1px solid var(--line-2);background:var(--paper-2);padding:14px 16px;margin-top:20px}
.calc-out dl{display:grid;grid-template-columns:1fr auto;gap:7px 18px;margin:0;font-size:.86rem}
.calc-out dt{color:var(--muted)}
.calc-out dd{margin:0;font-family:var(--mono);text-align:right;color:var(--ink)}
.calcnote{font-size:.78rem;color:var(--muted);margin:10px 0 0;max-width:70ch}
.calcnote b{font-family:var(--mono);color:var(--rust);font-size:1rem}

/* ---------- footer ---------- */
.ft{background:#0C141A;color:#B9B3A5;padding:clamp(36px,5vw,64px) 0 26px;position:relative}
.ft::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,rgba(185,179,165,.07) 1px,transparent 1px);
  background-size:56px 100%;
}
.ft .wrap{position:relative}
.ft-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:clamp(20px,3vw,40px);padding-bottom:32px;border-bottom:1px solid #242F36}
.ft .fbrand img{height:34px;width:auto;margin-bottom:14px}
.ft .fbrand p{font-size:.84rem;color:#9C9789;max-width:34ch}
.ft h4{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:#7E8A91;margin-bottom:1em}
.ft ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5em}
.ft a{color:#C8C2B2;font-size:.84rem;text-decoration:none}
.ft a:hover{color:#FBF9F3;text-decoration:underline}
.ft-bot{display:flex;justify-content:space-between;gap:1.4em;flex-wrap:wrap;padding-top:20px;font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:#7C878D}
.ft-entity{border:1px solid #2B373F;padding:12px 14px;font-size:.78rem;color:#A8A294;margin-top:18px;max-width:70ch}
.ft-entity strong{color:#D8D2C4;font-weight:600}

/* ---------- RFQ selection rows ---------- */
.selbox{border-top:1px solid var(--ink);margin-top:1.2em}
.selrow{
  display:grid;grid-template-columns:36px minmax(0,1fr) 210px 38px;
  gap:clamp(10px,1.6vw,18px);align-items:center;
  padding:14px 0;border-bottom:1px solid var(--line);
}
.selrow > span.mono{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--steel)}
.selrow strong{font-weight:600;font-size:.95rem}
.selrow input{width:100%;font-family:var(--sans)}
.selrow .icon-btn{width:34px;height:34px;justify-self:end}

/* ---------- sitemap index ---------- */
.smlist{list-style:none;margin:.5em 0 2em;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:0 clamp(18px,3vw,44px)}
.smlist li{display:grid;grid-template-columns:54px minmax(0,1fr);gap:10px;align-items:baseline;padding:7px 0;border-bottom:1px solid var(--line);font-size:.9rem}
.smlist .d{font-family:var(--mono);font-size:.6rem;color:var(--steel);letter-spacing:.08em;order:-1;text-align:right}

/* ---------- utilities ---------- */
.row2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,44px)}
.row3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2.4vw,32px)}
.stack{display:flex;flex-direction:column;gap:18px}
.center{text-align:center;margin-inline:auto}
.pad-y{padding-block:clamp(20px,3vw,40px)}
.hide{display:none !important}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* reveal */
[data-rev]{opacity:0;transform:translateY(14px)}
[data-rev].in{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
  [data-rev]{opacity:1;transform:none}
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr}
  .hero h1{max-width:18ch}
  .hero-fig img{aspect-ratio:16/9}
  .split{grid-template-columns:1fr}
  .aside{position:static;flex-direction:row;flex-wrap:wrap}
  .aside .box{flex:1 1 260px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .cband .wrap{grid-template-columns:1fr}
  .cband .acts{align-items:flex-start}
  .cband .acts .btn{width:auto;min-width:min(240px,100%)}
  .phead .ph-grid{grid-template-columns:1fr}
  .phead .ph-side{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:18px}

  /* the seven-item nav no longer fits: switch to the compact header here,
     not at 900px, otherwise the header overflows and the page scrolls sideways */
  .nav{display:none}
  .nav[data-open="true"]{
    display:flex;position:absolute;inset:74px 0 auto 0;background:var(--paper);
    flex-direction:column;align-items:stretch;gap:0;border-bottom:1px solid var(--line);
    padding:8px var(--gut) 20px;max-height:calc(100vh - 74px);overflow:auto;z-index:1;
  }
  .nav[data-open="true"] .nav-item{border-bottom:1px solid var(--line)}
  .nav[data-open="true"] .nav-btn{width:100%;justify-content:space-between;padding:14px 0;font-size:.95rem;border-bottom:0}
  .nav[data-open="true"] .nav-panel{display:none;position:static;border:0;box-shadow:none;background:transparent;padding:0 0 10px;max-height:none;min-width:0}
  .nav[data-open="true"] .nav-btn[aria-expanded="true"] + .nav-panel{display:block}
  .nav[data-open="true"] .nav-btn[aria-expanded="true"] .chev{transform:rotate(225deg) translateY(-2px)}
  .nav[data-open="true"] .nav-panel a{font-size:.86rem;color:var(--muted);border-bottom:1px solid rgba(200,191,173,.35);padding:8px 0 8px 12px}
  .nav[data-open="true"] .nav-panel .np-head{display:none}
  .hdr .wrap{min-height:64px}
  .hdr{backdrop-filter:none;background:var(--paper)}
  .menu-btn{display:grid !important}
  .brand .bt{display:none}
  .brand img{height:30px}
  .topbar .tb-right{display:none}
}

@media (max-width:900px){
  .grid-3,.grid-2,.steps,.row3,.row2,.plate,.fgrid,.sheet-body{grid-template-columns:1fr}
  .plate{border-bottom:0}
  .plate > div{border-left:0;border-bottom:1px solid var(--line);padding-left:0}
  .sheet-body > div + div{border-left:0;border-top:1px solid var(--line)}
  .sec-head{grid-template-columns:1fr;gap:10px}
  .sec-idx{display:inline-block;border-top:0;border-left:2px solid var(--rust);padding-left:8px}
  .linklist a{grid-template-columns:40px 1fr;gap:12px}
  .linklist a .ar{display:none}
  .tray{right:10px;left:10px;width:auto}
  .selrow{grid-template-columns:28px minmax(0,1fr) 38px;row-gap:8px}
  .selrow input{grid-column:2 / 3}
}

@media (min-width:1081px){.menu-btn{display:none}}

/* print */
@media print{
  .hdr,.topbar,.tray,.sov,.ft,.cband,.nav{display:none !important}
  body{background:#fff}
  body::before{display:none}
  .sheet{border-color:#000}
  a{color:#000}
  section{padding:12px 0}
}