/* ============================================================
   CHANG GU VIET NAM — site stylesheet
   Dark-first industrial design. No external dependencies.
   ============================================================ */
:root{
  --ink:#0b1015;
  --ink-2:#4a5761;
  --muted:#5c6b75;
  --bg:#ffffff;
  --bg-2:#f4f6f8;
  --line:#e3e8ec;
  --dark:#0b1015;
  --dark-2:#141c23;
  --dark-3:#1e2932;
  --accent:#ff5c1a;
  --accent-2:#d84708;
  --accent-soft:rgba(255,92,26,.12);
  --max:1200px;
  --r:14px;
  --r-sm:8px;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",
         Arial,"Noto Sans","Microsoft JhengHei","PingFang TC",sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16.5px;line-height:1.62;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{letter-spacing:-.025em;line-height:1.12;margin:0}
h1{font-weight:800}
h2{font-weight:800}
h3{font-weight:700;letter-spacing:-.01em;line-height:1.3}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
.wrap{width:min(100% - 40px,var(--max));margin-inline:auto}
:lang(zh) body,html[lang="zh-Hant"] body{letter-spacing:.01em}

/* ---------- utility ---------- */
.eyebrow{font-family:var(--mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:14px;display:block}
.sec-head{max-width:60ch;margin-bottom:44px}
.sec-head h2{font-size:clamp(1.6rem,3.1vw,2.4rem);margin-bottom:14px}
.sec-head p{color:var(--ink-2);font-size:1.03rem}
section{padding:88px 0;position:relative}
section.alt{background:var(--bg-2)}
section.dark{background:var(--dark);color:#fff}
section.dark .sec-head p{color:#a8b6c0}

/* reveal on scroll */
.rv{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}

/* ---------- header ---------- */
.hdr{position:sticky;top:0;z-index:80;background:rgba(11,16,21,.72);
  backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid rgba(255,255,255,.08);transition:background .3s var(--ease)}
.hdr.solid{background:rgba(11,16,21,.96)}
.hdr-in{display:flex;align-items:center;justify-content:space-between;gap:20px;height:70px;position:relative}
.brand{display:flex;align-items:center;gap:11px;color:#fff;flex-shrink:0}
.brand img{width:44px;height:26px;object-fit:contain}
.brand b{font-size:1.02rem;letter-spacing:.14em;display:block;line-height:1.15;font-weight:800}
.brand small{font-size:.62rem;letter-spacing:.2em;color:#8b9aa6;text-transform:uppercase;display:block}
.nav{display:flex;gap:24px;align-items:center}
.nav>a{color:#c2ced7;font-size:.9rem;padding:8px 0;position:relative;transition:color .2s}
.nav>a::after{content:"";position:absolute;left:0;right:100%;bottom:2px;height:2px;
  background:var(--accent);transition:right .3s var(--ease)}
.nav>a:hover{color:#fff}
.nav>a:hover::after,.nav>a.on::after{right:0}
.nav>a.on{color:#fff}
.nav .cta{background:var(--accent);color:#fff;padding:10px 20px;border-radius:999px;font-weight:700}
.nav .cta::after{display:none}
.nav .cta:hover{background:var(--accent-2);color:#fff}

/* language switcher */
.lang{display:flex;gap:2px;background:rgba(255,255,255,.09);border-radius:999px;padding:3px}
.lang a,.lang button{background:none;border:0;color:#9fadb8;font:inherit;font-size:.74rem;
  font-weight:700;padding:5px 9px;border-radius:999px;cursor:pointer;transition:.2s;
  white-space:nowrap;text-decoration:none;display:inline-block;line-height:1.5}
.lang a:hover,.lang button:hover{color:#fff}
.lang a.on,.lang button.on{background:var(--accent);color:#fff}
.burger{display:none;background:none;border:1px solid rgba(255,255,255,.22);color:#fff;
  border-radius:var(--r-sm);padding:7px 11px;font-size:1.05rem;cursor:pointer;line-height:1}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--dark);color:#fff;overflow:hidden;isolation:isolate}
.hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;
  transform:scale(1.04);animation:heroZoom 22s var(--ease) forwards}
@keyframes heroZoom{to{transform:scale(1)}}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(105deg,rgba(11,16,21,.95) 0%,rgba(11,16,21,.82) 42%,rgba(11,16,21,.35) 100%)}
.hero .wrap{padding:132px 0 118px;max-width:min(100% - 40px,var(--max))}
.hero h1{font-size:clamp(2.1rem,5.1vw,3.9rem);max-width:17ch;margin-bottom:24px}
.hero p{font-size:clamp(1rem,1.35vw,1.15rem);color:#c4d1da;max-width:54ch;margin-bottom:36px}
.kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:.7rem;
  letter-spacing:.19em;text-transform:uppercase;color:#fff;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.16);padding:7px 15px;border-radius:999px;margin-bottom:26px}
.kicker::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 0 0 rgba(255,92,26,.7);animation:pulse 2.4s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(255,92,26,0)}100%{box-shadow:0 0 0 0 rgba(255,92,26,0)}}

.btn{display:inline-block;padding:15px 30px;border-radius:999px;font-weight:700;font-size:.95rem;
  transition:.25s var(--ease);border:1px solid transparent}
.btn-p{background:var(--accent);color:#fff}
.btn-p:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:0 12px 28px rgba(255,92,26,.3)}
.btn-g{border-color:rgba(255,255,255,.35);color:#fff;margin-left:10px}
.btn-g:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.6)}

/* page banner */
.pbanner{position:relative;background:var(--dark);color:#fff;overflow:hidden;isolation:isolate}
.pbanner .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}
.pbanner::after{content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(100deg,rgba(11,16,21,.94),rgba(11,16,21,.6))}
.pbanner .wrap{padding:82px 0 74px}
.pbanner h1{font-size:clamp(1.8rem,3.7vw,2.9rem);margin-bottom:14px}
.pbanner p{color:#bccad3;max-width:60ch;font-size:1.03rem}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.stat{background:#fff;padding:34px 24px;text-align:center}
.stat b{display:block;font-size:2.6rem;font-weight:800;color:var(--ink);line-height:1;
  letter-spacing:-.04em;margin-bottom:10px}
.stat span{font-size:.86rem;color:var(--muted);display:block}

/* ---------- cards ---------- */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  display:flex;flex-direction:column;transition:.35s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 46px rgba(11,16,21,.11);border-color:transparent}
.card .ph{overflow:hidden;aspect-ratio:4/3}
.card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.card:hover .ph img{transform:scale(1.06)}
.card .body{padding:22px 22px 26px}
.card h3{margin-bottom:9px;font-size:1.06rem}
.card p{color:var(--ink-2);font-size:.92rem;margin:0}
section.dark .card{background:var(--dark-2);border-color:rgba(255,255,255,.09)}
section.dark .card h3{color:#fff}
section.dark .card p{color:#a4b2bd}

/* split */
.split{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.split>img,.split .ph img{border-radius:var(--r);width:100%;aspect-ratio:4/3;object-fit:cover}
.split h2{font-size:clamp(1.5rem,2.8vw,2.2rem);margin-bottom:16px}
.split p{color:var(--ink-2)}
.ticks{list-style:none;padding:0;margin:20px 0 0}
.ticks li{position:relative;padding-left:28px;margin-bottom:11px;color:var(--ink-2);font-size:.96rem}
.ticks li::before{content:"";position:absolute;left:0;top:.55em;width:14px;height:8px;
  border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;
  transition:.35s var(--ease)}
.step:hover{border-color:var(--accent);box-shadow:0 16px 36px rgba(11,16,21,.09)}
.step .ph{overflow:hidden;aspect-ratio:16/10}
.step .ph img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.step:hover .ph img{transform:scale(1.05)}
.step .body{padding:20px 22px 24px}
.step .num{counter-increment:s;font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;
  color:var(--accent);display:block;margin-bottom:7px}
.step .num::before{content:counter(s,decimal-leading-zero)}
.step h3{margin-bottom:7px;font-size:1rem}
.step p{margin:0;font-size:.9rem;color:var(--ink-2)}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.gal .ph{overflow:hidden;border-radius:var(--r-sm);aspect-ratio:1/1}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.gal .ph:hover img{transform:scale(1.08)}

/* table */
.tblwrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
table.spec{width:100%;border-collapse:collapse;font-size:.94rem}
table.spec th,table.spec td{text-align:left;padding:15px 18px;border-bottom:1px solid var(--line);vertical-align:top}
table.spec tr:last-child th,table.spec tr:last-child td{border-bottom:0}
table.spec th{width:30%;background:var(--bg-2);font-weight:700;white-space:nowrap}
table.spec td{color:var(--ink-2)}

/* cta band */
.band{background:var(--dark);color:#fff;text-align:center;overflow:hidden;position:relative}
.band::before{content:"";position:absolute;width:620px;height:620px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,92,26,.22),transparent 62%);
  top:-52%;left:50%;transform:translateX(-50%);pointer-events:none}
.band h2{font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:16px;position:relative}
.band p{color:#b3c1cb;max-width:58ch;margin:0 auto 30px;position:relative}
.band .btn{position:relative}

/* ---------- form ---------- */
form.rfq{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
form.rfq .full{grid-column:1/-1}
label{display:block;font-size:.8rem;font-weight:700;margin-bottom:7px}
input,select,textarea{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:var(--r-sm);
  font:inherit;font-size:.95rem;background:#fff;color:var(--ink);transition:.2s}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft)}
textarea{min-height:140px;resize:vertical}
.hint{font-size:.8rem;color:var(--muted);margin-top:8px}
.hint a{text-decoration:underline}
button.submit{background:var(--accent);color:#fff;border:0;padding:15px 34px;border-radius:999px;
  font:inherit;font-weight:700;cursor:pointer;transition:.25s var(--ease)}
button.submit:hover{background:var(--accent-2);transform:translateY(-2px)}

/* map */
.map{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--bg-2)}
.map iframe{width:100%;height:380px;border:0;display:block;filter:grayscale(.25) contrast(1.05)}
.map .bar{display:flex;justify-content:space-between;align-items:center;gap:14px;
  padding:14px 18px;background:#fff;border-top:1px solid var(--line);font-size:.88rem;flex-wrap:wrap}
.map .bar a{color:var(--accent);font-weight:700}

/* prose (privacy) */
.prose{max-width:74ch}
.prose h2{font-size:1.2rem;margin:38px 0 12px}
.prose h2:first-child{margin-top:0}
.prose p{color:var(--ink-2)}

/* ---------- footer ---------- */
.ftr{background:var(--dark);color:#93a2ad;padding:66px 0 26px;font-size:.9rem}
.ftr h4{color:#fff;font-family:var(--mono);font-size:.7rem;letter-spacing:.19em;
  text-transform:uppercase;margin:0 0 16px;font-weight:600}
.ftr a:hover{color:#fff}
.ftr .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:38px}
.ftr ul{list-style:none;margin:0;padding:0}
.ftr li{margin-bottom:9px}
.ftr .bot{border-top:1px solid rgba(255,255,255,.1);margin-top:46px;padding-top:22px;
  display:flex;justify-content:space-between;gap:16px;font-size:.82rem;flex-wrap:wrap}

/* ---------- AI assistant ---------- */
.ai-fab{position:fixed;right:22px;bottom:22px;z-index:90;background:var(--accent);color:#fff;
  border:0;border-radius:999px;padding:14px 22px;font:inherit;font-weight:700;font-size:.92rem;
  cursor:pointer;box-shadow:0 14px 34px rgba(255,92,26,.36);display:flex;align-items:center;gap:9px;
  transition:.25s var(--ease)}
.ai-fab:hover{background:var(--accent-2);transform:translateY(-2px)}
.ai-fab .dot{width:8px;height:8px;border-radius:50%;background:#fff;animation:pulse2 2s infinite}
@keyframes pulse2{50%{opacity:.35}}
.ai-panel{position:fixed;right:22px;bottom:22px;z-index:95;width:min(400px,calc(100vw - 32px));
  height:min(580px,calc(100vh - 44px));background:#fff;border-radius:var(--r);
  box-shadow:0 30px 80px rgba(11,16,21,.34);display:none;flex-direction:column;overflow:hidden;
  border:1px solid var(--line)}
.ai-panel.open{display:flex}
.ai-head{background:var(--dark);color:#fff;padding:16px 18px;display:flex;
  justify-content:space-between;align-items:center;gap:12px;flex-shrink:0}
.ai-head b{font-size:.95rem;display:block}
.ai-head small{color:#93a2ad;font-size:.74rem}
.ai-head button{background:none;border:0;color:#93a2ad;font-size:1.35rem;cursor:pointer;line-height:1;padding:0 4px}
.ai-head button:hover{color:#fff}
.ai-log{flex:1;overflow-y:auto;padding:18px;background:var(--bg-2);display:flex;flex-direction:column;gap:12px}
.ai-msg{max-width:88%;padding:11px 14px;border-radius:var(--r);font-size:.9rem;line-height:1.55;white-space:pre-wrap}
.ai-msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:3px}
.ai-msg.me{background:var(--dark-3);color:#fff;align-self:flex-end;border-bottom-right-radius:3px}
.ai-chips{display:flex;flex-wrap:wrap;gap:7px;padding:0 18px 12px;background:var(--bg-2);flex-shrink:0}
.ai-chips button{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 13px;
  font:inherit;font-size:.79rem;cursor:pointer;color:var(--ink-2);transition:.2s}
.ai-chips button:hover{border-color:var(--accent);color:var(--accent)}
.ai-form{display:flex;gap:9px;padding:12px 14px;border-top:1px solid var(--line);background:#fff;flex-shrink:0}
.ai-form input{flex:1;padding:11px 13px;font-size:.9rem}
.ai-form button{background:var(--accent);color:#fff;border:0;border-radius:var(--r-sm);
  padding:0 17px;font:inherit;font-weight:700;cursor:pointer}
.ai-note{font-size:.72rem;color:var(--muted);padding:0 18px 12px;background:var(--bg-2);flex-shrink:0}

/* AI intro block on home */
.ai-intro{background:var(--dark-2);border:1px solid rgba(255,255,255,.1);border-radius:var(--r);
  padding:38px 40px;color:#fff;position:relative;overflow:hidden}
.ai-intro::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;right:-110px;top:-140px;
  background:radial-gradient(circle,rgba(255,92,26,.28),transparent 65%)}
.ai-intro h3{font-size:1.35rem;margin-bottom:12px;position:relative}
.ai-intro p{color:#adbbc5;position:relative;margin-bottom:22px}
.ai-intro .btn{position:relative}
.ai-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;position:relative}
.ai-tags button{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);color:#d5dfe6;
  border-radius:999px;padding:8px 15px;font:inherit;font-size:.83rem;cursor:pointer;transition:.2s}
.ai-tags button:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* language auto-detect toast */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(120%);z-index:99;
  background:var(--dark);color:#fff;padding:13px 20px;border-radius:999px;font-size:.86rem;
  box-shadow:0 18px 44px rgba(11,16,21,.4);display:flex;align-items:center;gap:14px;
  transition:transform .45s var(--ease);max-width:calc(100vw - 32px)}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast button{background:rgba(255,255,255,.14);border:0;color:#fff;border-radius:999px;
  padding:6px 14px;font:inherit;font-size:.8rem;font-weight:700;cursor:pointer;white-space:nowrap}
.toast button:hover{background:var(--accent)}

/* ---------- responsive ---------- */
@media(max-width:1000px){
  .nav{position:absolute;top:70px;left:-20px;right:-20px;background:var(--dark);flex-direction:column;
    align-items:stretch;gap:0;padding:10px 20px 22px;display:none;
    border-bottom:1px solid rgba(255,255,255,.12);box-shadow:0 22px 44px rgba(0,0,0,.3)}
  .nav.open{display:flex}
  .nav>a{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.07)}
  .nav>a::after{display:none}
  .nav .cta{text-align:center;margin-top:14px;border-bottom:0}
  .nav .lang{margin-top:14px;justify-content:center}
  .burger{display:block}
}
@media(max-width:900px){
  .g3,.g4,.steps{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:32px}
  .ftr .cols{grid-template-columns:repeat(2,1fr)}
  .hero .wrap{padding:96px 0 84px}
  section{padding:64px 0}
}
@media(max-width:620px){
  .g2,.g3,.g4,.steps{grid-template-columns:1fr}
  .gal{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:1fr}
  form.rfq{grid-template-columns:1fr}
  .btn{display:block;text-align:center}
  .btn-g{margin-left:0;margin-top:11px}
  .ai-intro{padding:28px 22px}
  .ai-panel{right:0;bottom:0;width:100vw;height:100vh;border-radius:0;border:0}
  .ai-fab{right:14px;bottom:14px;padding:12px 18px}
  table.spec th{white-space:normal}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
}

/* ---------- AI assistant: lead capture + header buttons ---------- */
.ai-head-btns{display:flex;align-items:center;gap:10px;flex-shrink:0}
.ai-head-btns .clr{background:none;border:1px solid rgba(255,255,255,.22);color:#93a2ad;
  font:inherit;font-size:.72rem;padding:4px 10px;border-radius:999px;cursor:pointer;line-height:1.4}
.ai-head-btns .clr:hover{color:#fff;border-color:rgba(255,255,255,.45)}

.ai-lead{background:#fff;border:1px solid var(--accent);border-radius:var(--r);
  padding:16px 16px 14px;align-self:stretch;box-shadow:0 8px 22px rgba(255,92,26,.13)}
.ai-lead b{display:block;font-size:.92rem;margin-bottom:5px;color:var(--ink)}
.ai-lead p{font-size:.82rem;color:var(--ink-2);margin:0 0 12px}
.ai-lead .row{display:flex;gap:8px;margin-bottom:9px}
.ai-lead input{flex:1;padding:10px 12px;font-size:.88rem;min-width:0}
.ai-lead .lb{background:var(--accent);color:#fff;border:0;border-radius:var(--r-sm);
  padding:0 14px;font:inherit;font-size:.82rem;font-weight:700;cursor:pointer;white-space:nowrap}
.ai-lead .lb:hover{background:var(--accent-2)}
.ai-lead .ls{background:none;border:0;color:var(--muted);font:inherit;font-size:.78rem;
  cursor:pointer;padding:0;text-decoration:underline}
.ai-lead .ls:hover{color:var(--ink-2)}
@media(max-width:400px){
  .ai-lead .row{flex-direction:column}
  .ai-lead .lb{padding:10px 14px}
}

/* ---------- factory video ---------- */
.videowrap{border-radius:var(--r);overflow:hidden;background:var(--dark);
  box-shadow:0 24px 60px rgba(11,16,21,.18);max-width:940px;margin-inline:auto}
.videowrap video{width:100%;height:auto;display:block;aspect-ratio:16/9;background:var(--dark)}

/* ---------- FAQ ---------- */
.faqlist{max-width:78ch;border-top:1px solid var(--line)}
details.faq{border-bottom:1px solid var(--line)}
details.faq summary{cursor:pointer;padding:20px 44px 20px 0;position:relative;
  font-weight:700;font-size:1.02rem;list-style:none;transition:color .2s}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary:hover{color:var(--accent)}
details.faq summary::after{content:"";position:absolute;right:14px;top:50%;width:10px;height:10px;
  border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);
  transform:translateY(-70%) rotate(45deg);transition:transform .25s var(--ease)}
details.faq[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
details.faq>div{padding:0 44px 24px 0;color:var(--ink-2);font-size:.97rem}
details.faq[open] summary{color:var(--accent)}

/* ---------- grade table ---------- */
table.spec.grades th{width:auto;white-space:nowrap}
table.spec.grades td:first-child{font-weight:700;color:var(--ink);white-space:nowrap}
table.spec.grades td:nth-child(2),
table.spec.grades td:nth-child(3),
table.spec.grades td:nth-child(4){white-space:nowrap}

/* language offer: sits above the AI button, never covers it */
.lang-offer{bottom:88px}
.lang-offer a{text-decoration:underline;text-underline-offset:3px}
.lang-offer button{background:rgba(255,255,255,.14);border:0;color:#fff;border-radius:50%;
  width:24px;height:24px;line-height:1;font-size:1rem;cursor:pointer;padding:0;flex-shrink:0}
.lang-offer button:hover{background:var(--accent)}
@media(max-width:620px){.lang-offer{bottom:80px}}