/* ANRAN DHT commercial upgrade — 2026-08-28 */
:root{
  --gold:#7a5b3a;
  --ink:#122018;
  --paper:#f4f7f2;
  --signal:#e8b86a;
}

html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--t);font-family:var(--f);overflow-x:hidden}
*{box-sizing:border-box}
img{max-width:100%}

.nav{background:rgba(244,247,242,.92);color:var(--ink)}
.nav.nav-scrolled{background:rgba(244,247,242,.98);box-shadow:0 8px 30px rgba(18,32,24,.08)}
.nav-links{gap:24px}
.nav-links a.nav-cta{padding:10px 16px;border-radius:5px;background:var(--accent);color:#fff}
.nav-links a.nav-cta::after{display:none}
.nav-links a.nav-cta:hover{background:var(--accent-l);color:#fff}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--bd);border-radius:6px;background:transparent;color:var(--t);align-items:center;justify-content:center;cursor:pointer}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{display:block;width:19px;height:2px;background:currentColor;position:relative;transition:.25s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

.dht-hero{min-height:720px;display:grid;align-items:end;position:relative;padding:150px max(28px,calc((100% - 1200px)/2)) 84px;background:#172019;overflow:hidden}
.dht-hero-media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;background:center/cover no-repeat;opacity:.54;filter:saturate(.75) contrast(1.05)}
.dht-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,15,11,.97) 0%,rgba(9,15,11,.79) 48%,rgba(9,15,11,.25) 100%),linear-gradient(0deg,rgba(9,15,11,.92),transparent 48%)}
.dht-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:54px 54px;mask-image:linear-gradient(90deg,#000,transparent 72%)}
.dht-hero-inner{position:relative;z-index:2;max-width:880px}
.dht-kicker{display:inline-flex;align-items:center;gap:10px;color:#bcd4c2;font:700 .72rem/1 var(--mono);letter-spacing:2px;text-transform:uppercase;margin-bottom:24px}
.dht-kicker::before{content:"";width:28px;height:1px;background:var(--signal)}
.dht-hero h1{margin:0 0 20px;color:#fff;font-size:clamp(3rem,7vw,6.4rem);line-height:.95;letter-spacing:-.055em;font-weight:800;text-wrap:balance}
.dht-hero-lead{max-width:780px;margin:0 0 16px;color:#edf4ef;font-size:clamp(1.15rem,2.2vw,1.55rem);line-height:1.55;font-weight:560}
.dht-hero-copy{max-width:720px;margin:0;color:rgba(237,244,239,.76);font-size:1rem;line-height:1.8}
.dht-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.dht-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:5px;font-weight:750;font-size:.9rem;border:1px solid transparent;transition:.25s;text-decoration:none}
.dht-btn-primary{background:var(--signal);color:#172019}
.dht-btn-primary:hover{background:#f3c982;color:#172019;transform:translateY(-2px)}
.dht-btn-secondary{border-color:rgba(255,255,255,.34);color:#fff;background:rgba(255,255,255,.06);backdrop-filter:blur(8px)}
.dht-btn-secondary:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.12)}
.dht-hero-strip{position:relative;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:52px;max-width:860px;background:rgba(255,255,255,.17);border:1px solid rgba(255,255,255,.17)}
.dht-hero-strip>div{padding:16px 18px;background:rgba(14,25,18,.66);backdrop-filter:blur(12px)}
.dht-hero-strip strong{display:block;color:#fff;font-size:.9rem;margin-bottom:4px}
.dht-hero-strip span{color:rgba(255,255,255,.62);font-size:.74rem;line-height:1.45}

.dht-section{max-width:1200px;margin:0 auto;padding:96px 28px}
.dht-section-wide{max-width:none;background:var(--paper);border-top:1px solid var(--bd);border-bottom:1px solid var(--bd)}
.dht-section-wide>.dht-shell{max-width:1200px;margin:0 auto}
.dht-eyebrow{font:700 .68rem/1 var(--mono);letter-spacing:1.8px;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.dht-heading{max-width:900px;margin:0;font-size:clamp(2rem,4vw,3.6rem);line-height:1.06;letter-spacing:-.045em;color:var(--ink);text-wrap:balance}
.dht-intro{max-width:760px;margin:20px 0 0;color:var(--t3);font-size:1.02rem;line-height:1.8}
.dht-section-head{display:flex;justify-content:space-between;align-items:end;gap:36px;margin-bottom:44px}
.dht-section-head .dht-intro{margin:0;max-width:460px}

.dht-product-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.dht-product-card{position:relative;min-height:430px;padding:34px;border:1px solid var(--bd);border-radius:10px;overflow:hidden;background:#fff;display:flex;flex-direction:column;box-shadow:0 8px 26px rgba(18,32,24,.05);transition:.3s}
.dht-product-card:hover{transform:translateY(-5px);box-shadow:0 18px 46px rgba(18,32,24,.1);border-color:var(--bd2)}
.dht-product-card::after{content:"";position:absolute;right:-70px;bottom:-90px;width:240px;height:240px;border:1px solid rgba(13,102,48,.14);border-radius:50%;box-shadow:0 0 0 38px rgba(13,102,48,.035),0 0 0 76px rgba(13,102,48,.025)}
.dht-card-index{position:relative;z-index:1;font:700 .68rem/1 var(--mono);color:var(--accent);letter-spacing:1.6px;text-transform:uppercase}
.dht-product-card h3{position:relative;z-index:1;font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.08;letter-spacing:-.035em;margin:36px 0 16px;color:var(--ink)}
.dht-product-card p{position:relative;z-index:1;color:var(--t3);line-height:1.75;margin:0;max-width:530px}
.dht-chip-row{position:relative;z-index:1;display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.dht-chip{display:inline-flex;padding:7px 10px;border:1px solid var(--bd);border-radius:4px;color:var(--t2);background:var(--paper);font:650 .72rem/1.2 var(--mono)}
.dht-card-link{position:relative;z-index:1;margin-top:auto;padding-top:34px;font-weight:750;color:var(--accent)}

.dht-process{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--bd);border-left:1px solid var(--bd);margin-top:44px}
.dht-step{min-height:230px;padding:25px;border-right:1px solid var(--bd);border-bottom:1px solid var(--bd);background:rgba(255,255,255,.45)}
.dht-step-num{font:700 .68rem/1 var(--mono);color:var(--accent);letter-spacing:1px}
.dht-step>span{font:700 .68rem/1 var(--mono);color:var(--accent);letter-spacing:1px}
.dht-step h3{font-size:1.05rem;margin:52px 0 10px;color:var(--ink)}
.dht-step p{font-size:.82rem;line-height:1.65;color:var(--t3);margin:0}

.dht-proof-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;margin-top:44px}
.dht-proof-image{min-height:470px;border-radius:10px;overflow:hidden;position:relative;background:#182219}
.dht-proof-image img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;opacity:.82}
.dht-proof-image figcaption{position:absolute;left:22px;right:22px;bottom:20px;padding:14px 16px;background:rgba(10,18,12,.78);backdrop-filter:blur(10px);color:#fff;font-size:.78rem;line-height:1.55;border-left:2px solid var(--signal)}
.dht-proof-panel{border:1px solid var(--bd);border-radius:10px;padding:32px;background:#fff;display:flex;flex-direction:column}
.dht-proof-panel h3{font-size:1.55rem;line-height:1.18;margin:0 0 14px;color:var(--ink)}
.dht-proof-panel>p{color:var(--t3);line-height:1.7;margin:0}
.dht-proof-media{min-height:470px;border-radius:10px;overflow:hidden;position:relative;background:#182219;margin:0}
.dht-proof-media img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;opacity:.84}
.dht-proof-copy{border:1px solid var(--bd);border-radius:10px;padding:32px;background:#fff}
.dht-proof-copy>p{color:var(--t3);line-height:1.75}
.dht-boundary-note{margin-top:26px;padding:18px;border-left:3px solid var(--signal);background:#fff8e9;color:#5f5137}
.dht-boundary-note strong{display:block;color:var(--ink);margin-bottom:7px}
.dht-boundary-note p{margin:0;font-size:.8rem;line-height:1.65}
.dht-proof-list{display:grid;gap:0;margin:25px 0 0;border-top:1px solid var(--bd)}
.dht-proof-list>div{display:flex;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px solid var(--bd);font-size:.8rem}
.dht-proof-list span{color:var(--t4)}.dht-proof-list strong{color:var(--ink);font-family:var(--mono);text-align:right}
.dht-note{margin-top:auto;padding-top:24px;color:var(--t4);font-size:.72rem;line-height:1.6}

.dht-input-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:44px;background:var(--bd);border:1px solid var(--bd)}
.dht-input{background:#fff;padding:24px;min-height:150px}
.dht-input-card{background:#fff;padding:24px;min-height:150px}
.dht-input-card h3{font-size:1rem;margin:0 0 10px;color:var(--ink)}
.dht-input-card p{font-size:.8rem;line-height:1.65;color:var(--t3);margin:0}
.dht-input code{font:700 .67rem/1 var(--mono);color:var(--accent);letter-spacing:1px}
.dht-input h3{font-size:1rem;margin:28px 0 8px;color:var(--ink)}
.dht-input p{font-size:.8rem;line-height:1.6;color:var(--t3);margin:0}
.dht-process-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--bd);border-left:1px solid var(--bd);margin-top:44px}

.dht-faq{display:grid;grid-template-columns:.72fr 1.28fr;gap:70px;margin-top:44px}
.dht-faq-list{border-top:1px solid var(--bd)}
.dht-faq details{border-bottom:1px solid var(--bd);padding:20px 0}
.dht-faq summary{font-size:1rem;font-weight:730;color:var(--ink);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px}
.dht-faq summary::after{content:"+";font-family:var(--mono);color:var(--accent)}
.dht-faq details[open] summary::after{content:"−"}
.dht-faq details p{color:var(--t3);font-size:.86rem;line-height:1.75;margin:14px 36px 0 0}

.dht-cta{max-width:1200px;margin:0 auto 96px;padding:54px;border-radius:12px;background:#132019;color:#fff;display:grid;grid-template-columns:1fr auto;align-items:center;gap:36px;position:relative;overflow:hidden}
.dht-cta::after{content:"";position:absolute;right:-50px;top:-90px;width:290px;height:290px;border-radius:50%;border:1px solid rgba(255,255,255,.12);box-shadow:0 0 0 46px rgba(255,255,255,.035),0 0 0 92px rgba(255,255,255,.02)}
.dht-cta h2{position:relative;z-index:1;font-size:clamp(1.8rem,3.5vw,3rem);line-height:1.08;letter-spacing:-.04em;margin:0 0 12px;color:#fff}
.dht-cta p{position:relative;z-index:1;margin:0;color:rgba(255,255,255,.69);line-height:1.6}
.dht-cta .dht-actions{position:relative;z-index:1;margin:0}

.dht-page-hero{padding:152px 28px 70px;background:#142019;color:#fff;position:relative;overflow:hidden}
.dht-page-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:50px 50px}
.dht-page-hero-inner{max-width:1200px;margin:0 auto;position:relative;z-index:1}
.dht-page-hero h1{max-width:900px;margin:0 0 18px;font-size:clamp(2.5rem,5vw,4.8rem);line-height:1;letter-spacing:-.05em;color:#fff}
html[lang="zh-CN"] .dht-page-hero h1{max-width:1140px;font-size:clamp(2.5rem,4.6vw,4.3rem);letter-spacing:-.035em}
.dht-page-hero p{max-width:760px;margin:0;color:rgba(255,255,255,.72);font-size:1.05rem;line-height:1.75}
.dht-page-hero .dht-kicker{color:#bcd4c2}
.dht-breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0 0 28px;color:rgba(255,255,255,.58);font:650 .7rem/1.4 var(--mono)}
.dht-breadcrumb a{color:rgba(255,255,255,.72);text-decoration:none}.dht-breadcrumb a:hover{color:#fff}
.dht-breadcrumb span[aria-hidden="true"]{color:var(--signal)}
.dht-faq-compact{margin-top:42px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.dht-faq-compact details{border:1px solid var(--bd);border-radius:8px;background:#fff;padding:18px 20px}
.dht-faq-compact summary{cursor:pointer;font-weight:750;color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:18px}
.dht-faq-compact summary::after{content:"+";color:var(--accent);font-family:var(--mono)}
.dht-faq-compact details[open] summary::after{content:"−"}
.dht-faq-compact p{margin:12px 0 0;color:var(--t3);font-size:.84rem;line-height:1.72}
.dht-trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--bd);border:1px solid var(--bd);margin-top:42px}
.dht-trust-card{background:#fff;padding:28px}.dht-trust-card h3{margin:0 0 10px;color:var(--ink);font-size:1.1rem}.dht-trust-card p{margin:0;color:var(--t3);font-size:.85rem;line-height:1.72}

.dht-video-section{max-width:none;background:#101a14;color:#fff;border-top:1px solid rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.08)}
.dht-video-section>.dht-shell{max-width:1200px;margin:0 auto}
.dht-video-section .dht-eyebrow{color:#d8a44f}
.dht-video-section .dht-heading{color:#fff}
.dht-video-section .dht-intro{color:rgba(255,255,255,.68)}
.dht-video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:42px}
.dht-video-grid--single{grid-template-columns:minmax(0,920px)}
.dht-video-card{margin:0;overflow:hidden;border:1px solid rgba(255,255,255,.12);border-radius:10px;background:#18251d;box-shadow:0 24px 64px rgba(3,10,6,.24)}
.dht-video-frame{position:relative;aspect-ratio:16/9;overflow:hidden;background:#080d0a}
.dht-video-frame::after{content:"Production footage";position:absolute;top:14px;left:14px;padding:7px 9px;border:1px solid rgba(255,255,255,.22);border-radius:4px;background:rgba(8,13,10,.72);color:rgba(255,255,255,.82);font:700 .58rem/1 var(--mono);letter-spacing:1.1px;text-transform:uppercase;pointer-events:none;backdrop-filter:blur(8px)}
.dht-video-frame video{display:block;width:100%;height:100%;object-fit:cover;background:#080d0a}
.dht-video-caption{padding:24px 26px 27px}
.dht-video-caption h3{margin:0 0 9px;color:#fff;font-size:1.18rem;line-height:1.25;letter-spacing:-.018em}
.dht-video-caption p{max-width:68ch;margin:0;color:rgba(255,255,255,.64);font-size:.84rem;line-height:1.72;text-wrap:pretty}
.dht-video-note{display:flex;gap:10px;align-items:flex-start;margin-top:22px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);color:rgba(255,255,255,.58);font-size:.76rem;line-height:1.65}
.dht-video-note::before{content:"i";flex:0 0 20px;width:20px;height:20px;border:1px solid rgba(216,164,79,.65);border-radius:50%;color:#d8a44f;text-align:center;font:700 .68rem/18px var(--mono)}

.dht-catalog{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:42px}
.dht-catalog-card{padding:28px;border:1px solid var(--bd);border-radius:9px;background:#fff;display:flex;flex-direction:column;min-height:310px;transition:.25s}
.dht-catalog-card:hover{transform:translateY(-4px);border-color:var(--bd2);box-shadow:var(--shadow-md)}
.dht-catalog-card .dht-card-index{margin-bottom:32px}
.dht-catalog-card h2,.dht-catalog-card h3{font-size:1.55rem;line-height:1.15;letter-spacing:-.025em;color:var(--ink);margin:0 0 12px}
.dht-catalog-card p{font-size:.86rem;line-height:1.7;color:var(--t3);margin:0}
.dht-catalog-card .dht-card-link{padding-top:24px}
.dht-catalog-card.dht-catalog-contact{background:#e0ece2}

.dht-form-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:44px;align-items:start}
.dht-contact-panel{position:sticky;top:100px;border:1px solid var(--bd);border-radius:10px;background:#fff;padding:28px}
.dht-contact-panel h2{font-size:1.45rem;margin:0 0 12px;color:var(--ink)}
.dht-contact-panel p{color:var(--t3);font-size:.85rem;line-height:1.7}
.dht-contact-links{display:grid;gap:10px;margin-top:22px}
.dht-contact-link{padding:14px 16px;border:1px solid var(--bd);border-radius:6px;font-weight:720;color:var(--ink);background:var(--paper)}
.dht-contact-link:hover{border-color:var(--accent);color:var(--accent)}
.dht-rfq{border:1px solid var(--bd);border-radius:10px;background:#fff;padding:34px}
.dht-rfq h2{font-size:1.7rem;margin:0 0 8px;color:var(--ink)}
.dht-rfq>p{margin:0 0 28px;color:var(--t3);line-height:1.65}
.dht-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.dht-field{display:flex;flex-direction:column;gap:7px}
.dht-field-full{grid-column:1/-1}
.dht-field label{font:700 .67rem/1.2 var(--mono);letter-spacing:.6px;color:var(--t2)}
.dht-field input,.dht-field select,.dht-field textarea{width:100%;border:1px solid var(--bd);border-radius:5px;padding:12px 13px;background:var(--paper);color:var(--t);font:inherit;font-size:.88rem;outline:none}
.dht-field input:focus,.dht-field select:focus,.dht-field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(13,102,48,.09);background:#fff}
.dht-field textarea{min-height:132px;resize:vertical}
.dht-form-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:22px}
.dht-form-actions button{font:inherit;cursor:pointer}
.dht-form-status{width:100%;min-height:24px;color:var(--t3);font-size:.8rem;line-height:1.55}
.dht-form-status.is-success{color:var(--accent)}.dht-form-status.is-error{color:#a43f2e}
.dht-form-fallback{display:none;margin-top:12px;padding:14px;border:1px solid #d9b9b0;border-radius:6px;background:#fff7f4;color:#7c3023;font-size:.8rem;line-height:1.6}
.dht-form-fallback.is-visible{display:block}

.dht-tech-note{max-width:1200px;margin:22px auto 0;padding:14px 18px;border-left:3px solid var(--signal);background:#fff8e9;color:#5f5137;font-size:.78rem;line-height:1.65}

/* AR-HCCI measured cooling comparison */
.dht-hcci-data-section{max-width:none;background:#edf3ed;border-top:1px solid var(--bd);border-bottom:1px solid var(--bd)}
.dht-hcci-data-section>.dht-shell{max-width:1200px;margin:0 auto}
.dht-hcci-data-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(330px,.64fr);gap:54px;align-items:end}
.dht-hcci-data-head .dht-intro{margin-top:20px}
.dht-hcci-ratio{position:relative;overflow:hidden;border-radius:10px;background:#132019;color:#fff;padding:28px 30px;box-shadow:0 20px 50px rgba(18,32,24,.14)}
.dht-hcci-ratio::after{content:"";position:absolute;right:-54px;top:-68px;width:190px;height:190px;border:1px solid rgba(255,255,255,.12);border-radius:50%;box-shadow:0 0 0 30px rgba(255,255,255,.035),0 0 0 60px rgba(255,255,255,.02)}
.dht-hcci-ratio-kicker{position:relative;z-index:1;color:#e8b86a;font:700 .65rem/1 var(--mono);letter-spacing:1.4px;text-transform:uppercase}
.dht-hcci-ratio-formula{position:relative;z-index:1;display:flex;align-items:end;gap:12px;margin:22px 0 16px}
.dht-hcci-ratio-part{display:grid;gap:5px}
.dht-hcci-ratio-part strong{color:#fff;font:800 clamp(2.7rem,5vw,4.7rem)/.8 var(--mono);letter-spacing:-.08em}
.dht-hcci-ratio-part span{color:rgba(255,255,255,.62);font-size:.72rem;line-height:1.3}
.dht-hcci-ratio-plus{color:#e8b86a;font:500 1.5rem/1 var(--mono);padding-bottom:18px}
.dht-hcci-ratio p{position:relative;z-index:1;margin:0;color:rgba(255,255,255,.67);font-size:.76rem;line-height:1.65}
.dht-hcci-provenance{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;margin:40px 0 22px;padding:20px 22px;border:1px solid #d8c8a9;border-radius:8px;background:#fffaf0}
.dht-hcci-provenance-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:#f1dbb5;color:#604a2f;font:800 .72rem/1 var(--mono)}
.dht-hcci-provenance strong{display:block;color:var(--ink);font-size:.88rem;margin:0 0 6px}
.dht-hcci-provenance p{margin:0;color:#685a43;font-size:.78rem;line-height:1.7}
.dht-hcci-toolbar{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:30px 0 14px}
.dht-hcci-toolbar-copy{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.dht-hcci-selected-count{font:750 .72rem/1 var(--mono);letter-spacing:.5px;color:var(--accent)}
.dht-hcci-status{min-height:16px;color:var(--t4);font-size:.72rem}
.dht-hcci-show-all{border:1px solid var(--bd2);border-radius:5px;background:#fff;color:var(--ink);padding:10px 14px;font:750 .72rem/1 var(--f);cursor:pointer;transition:.2s}
.dht-hcci-show-all:hover,.dht-hcci-show-all:focus-visible{border-color:var(--accent);color:var(--accent);outline:none}
.dht-hcci-selector{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.dht-hcci-series-button{min-height:106px;display:grid;grid-template-columns:28px 1fr;gap:12px;text-align:left;padding:17px;border:1px solid var(--bd);border-radius:8px;background:rgba(255,255,255,.66);color:var(--ink);cursor:pointer;font:inherit;transition:.2s}
.dht-hcci-series-button:hover{transform:translateY(-2px);border-color:var(--bd2);background:#fff}
.dht-hcci-series-button:focus-visible{outline:3px solid rgba(13,102,48,.18);outline-offset:2px}
.dht-hcci-series-button[aria-pressed="true"]{background:#fff;border-color:color-mix(in srgb,var(--series) 55%,#cfd8cf);box-shadow:0 10px 24px rgba(18,32,24,.07)}
.dht-hcci-series-button[aria-pressed="false"]{opacity:.52;filter:grayscale(.55)}
.dht-hcci-series-line{position:relative;display:block;width:28px;height:18px;margin-top:2px}
.dht-hcci-series-line::before{content:"";position:absolute;top:8px;left:0;right:0;border-top:3px solid var(--series)}
.dht-hcci-series-button[data-series="air30"] .dht-hcci-series-line::before{border-top-style:dashed}
.dht-hcci-series-button[data-series="liquid50"] .dht-hcci-series-line::before{border-top-style:dotted}
.dht-hcci-series-button[data-series="liquid90"] .dht-hcci-series-line::before{border-top-style:double}
.dht-hcci-series-copy strong{display:block;font-size:.88rem;line-height:1.25;color:var(--ink)}
.dht-hcci-series-copy small{display:block;margin-top:7px;color:var(--t4);font-size:.68rem;line-height:1.45}
.dht-hcci-chart-layout{display:grid;grid-template-columns:1fr;gap:14px;margin-top:18px}
.dht-hcci-chart-card{position:relative;margin:0;border:1px solid var(--bd);border-radius:10px;background:#fff;overflow:hidden;box-shadow:0 12px 30px rgba(18,32,24,.055)}
.dht-hcci-chart-heading{display:flex;justify-content:space-between;gap:28px;align-items:center;padding:23px 26px 14px}
.dht-hcci-chart-heading h3{margin:0;color:var(--ink);font-size:1.14rem;line-height:1.3}
.dht-hcci-chart-heading p{max-width:690px;margin:6px 0 0;color:var(--t4);font-size:.72rem;line-height:1.55}
.dht-hcci-axis-key{flex:0 0 auto;display:grid;gap:7px;padding-left:22px;border-left:1px solid var(--bd)}
.dht-hcci-axis-key span{display:flex;align-items:center;gap:9px;color:var(--t3);font:650 .66rem/1.35 var(--mono);white-space:nowrap}
.dht-hcci-axis-key i{display:block;width:28px;height:0;border-top:2px solid #53645a}
.dht-hcci-axis-key i.dht-hcci-axis-key--rate{border-top-width:1px;border-top-style:dashed;border-top-color:#9a713d}
.dht-hcci-chart-controls{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px 16px;padding:0 26px 18px;border-bottom:1px solid #e4eae4}
.dht-hcci-chart-controls .dht-hcci-toolbar{display:contents;margin:0}
.dht-hcci-chart-controls .dht-hcci-toolbar-copy{grid-column:1;grid-row:1;display:grid;gap:5px;min-width:108px}
.dht-hcci-chart-controls .dht-hcci-selector{grid-column:2;grid-row:1;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}
.dht-hcci-chart-controls .dht-hcci-show-all{grid-column:3;grid-row:1;white-space:nowrap}
.dht-hcci-chart-controls .dht-hcci-series-button{min-height:60px;grid-template-columns:22px 1fr;gap:9px;padding:10px 11px;border-radius:6px;background:#f8faf8;box-shadow:none}
.dht-hcci-chart-controls .dht-hcci-series-button:hover{transform:translateY(-1px)}
.dht-hcci-chart-controls .dht-hcci-series-button[aria-pressed="true"]{background:#fff;box-shadow:0 6px 16px rgba(18,32,24,.055)}
.dht-hcci-chart-controls .dht-hcci-series-line{width:22px;margin-top:0}
.dht-hcci-chart-controls .dht-hcci-series-copy strong{font-size:.76rem;line-height:1.2}
.dht-hcci-chart-controls .dht-hcci-series-copy small{margin-top:4px;font-size:.6rem;line-height:1.35}
.dht-hcci-chart-viewport{position:relative;overflow:hidden}
.dht-hcci-chart-viewport svg{display:block;width:100%;min-width:0;height:auto;background:#fff;touch-action:pan-x pan-y}
.dht-hcci-chart-gridlines line{stroke:#dfe6df;stroke-width:1;vector-effect:non-scaling-stroke}
.dht-hcci-chart-gridlines text{fill:#718075;font:600 11px/1 var(--mono)}
.dht-hcci-chart-gridlines .dht-hcci-tick--top{fill:#86623a}
.dht-hcci-axis-frame{stroke:#8b978e;stroke-width:1;vector-effect:non-scaling-stroke}
.dht-hcci-axis{stroke:#7f8c82;stroke-width:1.2;vector-effect:non-scaling-stroke}
.dht-hcci-axis-label{fill:#405047;font:700 12px/1 var(--mono);letter-spacing:.15px}
.dht-hcci-axis--top{stroke:#9a713d}.dht-hcci-axis-label--top{fill:#7a5b3a}
.dht-hcci-series-path{stroke-linecap:round;stroke-linejoin:round;opacity:.95}
.dht-hcci-series-path--rate{opacity:.86}
.dht-hcci-pointer{opacity:0;transition:opacity .12s}
.dht-hcci-pointer.is-visible{opacity:1}
.dht-hcci-pointer-line{stroke:#718075;stroke-width:1;stroke-dasharray:3 4;vector-effect:non-scaling-stroke}
.dht-hcci-pointer-dot{stroke:#fff;stroke-width:2;vector-effect:non-scaling-stroke}
.dht-hcci-tooltip{position:absolute;z-index:4;display:none;min-width:184px;padding:12px 13px;border:1px solid rgba(255,255,255,.16);border-radius:6px;background:rgba(18,32,24,.95);box-shadow:0 12px 30px rgba(6,14,9,.2);color:#fff;pointer-events:none}
.dht-hcci-tooltip.is-visible{display:grid;gap:4px}
.dht-hcci-tooltip strong{max-width:220px;color:#fff;font-size:.76rem;line-height:1.3}
.dht-hcci-tooltip span{color:rgba(255,255,255,.72);font:600 .65rem/1.35 var(--mono)}
.dht-hcci-table-block{margin-top:18px;border:1px solid var(--bd);border-radius:10px;background:#fff;overflow:hidden}
.dht-hcci-table-head{display:flex;justify-content:space-between;gap:24px;align-items:end;padding:24px 26px;border-bottom:1px solid var(--bd)}
.dht-hcci-table-head h3{margin:0 0 6px;color:var(--ink);font-size:1.08rem}
.dht-hcci-table-head p{max-width:680px;margin:0;color:var(--t4);font-size:.74rem;line-height:1.6}
.dht-hcci-table-scroll{overflow-x:auto}
.dht-hcci-table{width:100%;min-width:1050px;border-collapse:collapse;font-variant-numeric:tabular-nums}
.dht-hcci-table th,.dht-hcci-table td{padding:15px 13px;border-bottom:1px solid #e9ede9;text-align:right;vertical-align:middle;white-space:nowrap}
.dht-hcci-table thead th{background:#f4f7f2;color:#617066;font:750 .65rem/1.4 var(--mono)}
.dht-hcci-table th:first-child,.dht-hcci-table td:first-child{text-align:left;position:sticky;left:0;z-index:1;background:#fff;white-space:normal;min-width:210px}
.dht-hcci-table thead th:first-child{z-index:2;background:#f4f7f2}
.dht-hcci-table tbody tr:last-child th,.dht-hcci-table tbody tr:last-child td{border-bottom:0}
.dht-hcci-row-title{display:flex;gap:10px;align-items:center;color:var(--ink);font-size:.78rem;line-height:1.35}
.dht-hcci-row-line{flex:0 0 22px;width:22px;border-top:3px solid var(--series)}
.dht-hcci-table td{color:#324239;font:650 .72rem/1.2 var(--mono)}
.dht-hcci-findings{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}
.dht-hcci-finding{padding:24px 26px;border-radius:9px;background:#132019;color:#fff}
.dht-hcci-finding span{display:block;color:#e8b86a;font:700 .64rem/1 var(--mono);letter-spacing:1.1px;text-transform:uppercase;margin-bottom:13px}
.dht-hcci-finding strong{display:block;color:#fff;font-size:1.08rem;line-height:1.45;margin-bottom:9px}
.dht-hcci-finding p{margin:0;color:rgba(255,255,255,.66);font-size:.78rem;line-height:1.7}
.dht-hcci-source-footer{margin:20px 0 0;color:var(--t4);font-size:.72rem;line-height:1.7}
.dht-sag-comparison .dht-hcci-chart-controls .dht-hcci-selector{grid-template-columns:repeat(2,minmax(0,1fr))}
.dht-uhs-comparison .dht-hcci-chart-controls .dht-hcci-selector{grid-template-columns:repeat(2,minmax(0,1fr))}
.dht-sag-comparison .dht-hcci-series-button[data-series="record2027"] .dht-hcci-series-line::before{border-top-style:solid}
.dht-uhs-comparison .dht-hcci-series-button[data-series="record2027"] .dht-hcci-series-line::before{border-top-style:solid}

@media(max-width:1000px){
  .dht-process,.dht-process-grid{grid-template-columns:repeat(2,1fr)}
  .dht-process>.dht-step:last-child{grid-column:1/-1}
  .dht-input-grid{grid-template-columns:repeat(2,1fr)}
  .dht-section-head{display:block}.dht-section-head .dht-intro{margin-top:18px}
  .dht-faq,.dht-form-layout{grid-template-columns:1fr;gap:34px}
  .dht-contact-panel{position:static}
  .dht-hcci-data-head{grid-template-columns:1fr;gap:34px}
  .dht-hcci-selector{grid-template-columns:repeat(2,minmax(0,1fr))}
  .dht-hcci-chart-controls{grid-template-columns:1fr auto}
  .dht-hcci-chart-controls .dht-hcci-toolbar-copy{grid-column:1;grid-row:1}
  .dht-hcci-chart-controls .dht-hcci-show-all{grid-column:2;grid-row:1}
  .dht-hcci-chart-controls .dht-hcci-selector{grid-column:1/-1;grid-row:2;grid-template-columns:repeat(2,minmax(0,1fr))}
  .dht-hcci-chart-layout{grid-template-columns:1fr}
}

@media(max-width:820px){
  .nav{height:64px;padding:0 18px}
  .nav-brand-text{font-size:.9rem!important;letter-spacing:.6px!important}
  .nav-toggle{display:flex;z-index:3}
  .nav-right{position:fixed;top:64px;left:0;right:0;background:rgba(244,247,242,.98);border-bottom:1px solid var(--bd);padding:0 20px;max-height:0;overflow:hidden;transition:max-height .3s ease;box-shadow:0 16px 30px rgba(18,32,24,.1)}
  .nav-right.is-open{max-height:620px;padding-top:14px;padding-bottom:18px}
  .nav-links{display:flex;flex-direction:column;align-items:stretch;gap:2px}
  .nav-links>a{padding:12px 8px;font-size:.76rem}
  .nav-links a::after{display:none}
  .nav-lang{margin:12px 0 0;padding:12px 0 0;border-left:0;border-top:1px solid var(--bd)}
  .dht-hero{min-height:760px;padding-top:122px;padding-bottom:60px;background:#132019}
  .dht-hero::before{background:linear-gradient(0deg,rgba(9,15,11,.96),rgba(9,15,11,.62))}
  .dht-hero h1{font-size:clamp(3rem,14vw,5rem)}
  .dht-hero-strip{grid-template-columns:1fr;margin-top:34px}
  .dht-product-grid,.dht-proof-grid,.dht-catalog{grid-template-columns:1fr}
  .dht-video-grid,.dht-video-grid--single{grid-template-columns:1fr}
  .dht-faq-compact,.dht-trust-grid{grid-template-columns:1fr}
  .dht-hcci-findings{grid-template-columns:1fr}
  .dht-proof-image{min-height:380px}
  .dht-cta{margin:0 20px 70px;padding:36px 26px;grid-template-columns:1fr}
  .dht-cta .dht-actions{margin-top:8px}
}

@media(max-width:580px){
  .dht-section{padding:72px 20px}
  .dht-page-hero{padding:126px 20px 58px}
  .dht-product-card{min-height:390px;padding:26px}
  .dht-process,.dht-process-grid,.dht-input-grid{grid-template-columns:1fr}
  .dht-process>.dht-step:last-child{grid-column:auto}
  .dht-form-grid{grid-template-columns:1fr}
  .dht-field-full{grid-column:auto}
  .dht-rfq{padding:24px 18px}
  .dht-video-caption{padding:20px 20px 23px}
  .dht-video-frame::after{top:10px;left:10px}
  .dht-actions,.dht-form-actions{flex-direction:column;align-items:stretch}
  .dht-btn{width:100%}
  .dht-hcci-ratio{padding:24px 22px}
  .dht-hcci-selector{grid-template-columns:repeat(2,minmax(0,1fr))}
  .dht-hcci-series-button{min-height:78px}
  .dht-hcci-toolbar{align-items:flex-start}
  .dht-hcci-toolbar-copy{display:grid;gap:7px}
  .dht-hcci-chart-heading{display:block;padding:20px 20px 15px}
  .dht-hcci-axis-key{margin-top:14px;padding:13px 0 0;border-left:0;border-top:1px solid var(--bd)}
  .dht-hcci-axis-key span{white-space:normal}
  .dht-hcci-chart-controls{padding:0 20px 16px;gap:10px 12px}
  .dht-hcci-chart-controls .dht-hcci-toolbar-copy{min-width:0;gap:4px}
  .dht-hcci-chart-controls .dht-hcci-selector{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
  .dht-hcci-chart-controls .dht-hcci-series-button{min-height:68px;padding:9px 10px}
  .dht-hcci-chart-viewport{overflow-x:hidden}
  .dht-hcci-chart-viewport svg{min-width:0;width:100%}
  .dht-hcci-chart-gridlines text{font-size:28px}
  .dht-hcci-axis-label{font-size:29px}
  .dht-sag-comparison .dht-hcci-axis-label--vertical{display:none}
.dht-uhs-comparison .dht-hcci-axis-label--vertical{display:none}
  .dht-hcci-table-head{display:block;padding:21px 20px}
  .dht-hcci-finding{padding:22px 20px}
}

@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}