/* ==========================================================================
   BRD 博锐迪 · 新材料与低温标识
   Design system: lab-spec sheet aesthetic — deep navy, cryo cyan, hairlines
   ========================================================================== */

:root{
  --ink:#0a1729;
  --navy:#14294e;
  --navy-2:#1c3a67;
  --navy-3:#2a4c7d;
  --cyan:#00b0c8;
  --cyan-soft:#7fdfec;
  --ice:#eef7fb;
  --paper:#ffffff;
  --paper-2:#f6f9fc;
  --line:#dde7f0;
  --line-strong:#c6d6e4;
  --muted:#5c7189;
  --amber:#e79a2b;
  --ok:#1f9d77;

  --radius:2px;
  --radius-lg:4px;
  --shadow-sm:0 1px 2px rgba(10,23,41,.05), 0 4px 16px rgba(10,23,41,.04);
  --shadow-md:0 2px 6px rgba(10,23,41,.06), 0 18px 40px rgba(10,23,41,.08);
  --wrap:1180px;
  --nav-h:72px;

  --f-sans:"Inter","SF Pro Text",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --f-mono:"SF Mono","JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;
}

*,*::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(--f-sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--cyan);color:#fff}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
.wrap-narrow{max-width:860px;margin:0 auto;padding:0 28px}

/* ---------- typography ---------- */
h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:-.01em;line-height:1.25}
h1{font-size:clamp(2.2rem,4.6vw,3.5rem);letter-spacing:-.025em}
h2{font-size:clamp(1.6rem,2.6vw,2.25rem);letter-spacing:-.02em}
h3{font-size:1.125rem}
p{margin:0}
.eyebrow{
  font-family:var(--f-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan);display:flex;align-items:center;gap:.6rem;margin-bottom:1rem;font-weight:500;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);display:inline-block}
.eyebrow.on-dark{color:var(--cyan-soft)}
.lede{font-size:clamp(1rem,1.3vw,1.14rem);line-height:1.85;color:var(--muted);max-width:64ch}
.on-dark .lede,.lede.on-dark{color:rgba(255,255,255,.72)}
.section{padding:clamp(64px,8vw,110px) 0}
.section.tight{padding:clamp(44px,5vw,64px) 0}
.section-head{max-width:760px;margin-bottom:clamp(32px,4vw,56px)}
.section-head h2{margin-bottom:1rem}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.center .eyebrow{justify-content:center}
.section-head.center .lede{margin-left:auto;margin-right:auto}
.bg-paper{background:var(--paper-2)}
.bg-ink{background:var(--ink);color:#fff}
.bg-navy{background:linear-gradient(155deg,var(--navy) 0%,var(--ink) 70%);color:#fff}
.hairline{height:1px;background:var(--line);border:0;margin:0}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;padding:.82rem 1.5rem;
  font-size:.9rem;font-weight:600;letter-spacing:.01em;border-radius:var(--radius);
  transition:all .22s ease;border:1px solid transparent;white-space:nowrap;
}
.btn svg{width:15px;height:15px;flex:none}
.btn-primary{background:var(--cyan);color:#fff}
.btn-primary:hover{background:#0096ad;transform:translateY(-1px);box-shadow:0 8px 20px rgba(0,176,200,.28)}
.btn-ghost{border-color:rgba(255,255,255,.32);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.6)}
.btn-outline{border-color:var(--line-strong);color:var(--navy);background:#fff}
.btn-outline:hover{border-color:var(--navy);background:var(--paper-2)}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--navy-2);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.link-arrow{display:inline-flex;align-items:center;gap:.45rem;font-size:.875rem;font-weight:600;color:var(--navy)}
.link-arrow::after{content:"→";transition:transform .2s}
.link-arrow:hover::after{transform:translateX(4px)}
.link-arrow.on-dark{color:var(--cyan-soft)}

/* ---------- header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;height:var(--nav-h);
  transition:background .3s ease,box-shadow .3s ease,border-color .3s ease;
  border-bottom:1px solid transparent;
}
.site-header.is-solid{background:rgba(255,255,255,.96);backdrop-filter:saturate(180%) blur(12px);border-bottom-color:var(--line);box-shadow:0 1px 0 rgba(10,23,41,.02)}
.header-inner{max-width:var(--wrap);margin:0 auto;padding:0 28px;height:100%;display:flex;align-items:center;gap:2rem}
.brand{display:flex;align-items:center;gap:.8rem;flex:none}
.brand img{height:26px;width:auto}
.brand .brand-mark{height:26px;width:auto;filter:none}
.brand-sep{width:1px;height:22px;background:rgba(255,255,255,.25);display:none}
.site-header.is-solid .brand-sep{background:var(--line)}
.nav{display:flex;align-items:center;gap:.35rem;margin-left:auto}
.nav a{
  font-size:.875rem;font-weight:500;padding:.5rem .85rem;border-radius:var(--radius);
  color:rgba(255,255,255,.82);transition:color .18s,background .18s;position:relative;
}
.nav a:hover{color:#fff;background:rgba(255,255,255,.08)}
.site-header.is-solid .nav a{color:var(--navy)}
.site-header.is-solid .nav a:hover{background:var(--paper-2);color:var(--cyan)}
.nav a.active{color:#fff}
.nav a.active::after{content:"";position:absolute;left:.85rem;right:.85rem;bottom:2px;height:2px;background:var(--cyan)}
.site-header.is-solid .nav a.active{color:var(--cyan)}
.header-actions{display:flex;align-items:center;gap:.75rem;margin-left:.5rem}
.lang-switch{
  font-family:var(--f-mono);font-size:.75rem;letter-spacing:.08em;padding:.4rem .7rem;
  border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);color:rgba(255,255,255,.85);
  transition:all .18s;
}
.lang-switch:hover{border-color:#fff;color:#fff}
.site-header.is-solid .lang-switch{border-color:var(--line-strong);color:var(--navy)}
.site-header.is-solid .lang-switch:hover{border-color:var(--cyan);color:var(--cyan)}
.header-cta{padding:.6rem 1.1rem;font-size:.82rem}
.menu-btn{display:none;width:40px;height:40px;align-items:center;justify-content:center;color:#fff}
.site-header.is-solid .menu-btn{color:var(--navy)}
.menu-btn span{display:block;width:20px;height:1.5px;background:currentColor;position:relative}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:20px;height:1.5px;background:currentColor}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}

/* mobile drawer */
.mobile-nav{
  position:fixed;inset:var(--nav-h) 0 auto 0;z-index:99;background:#fff;border-bottom:1px solid var(--line);
  transform:translateY(-8px);opacity:0;pointer-events:none;transition:all .25s ease;padding:.75rem 1.25rem 1.25rem;
  box-shadow:var(--shadow-md);max-height:calc(100vh - var(--nav-h));overflow:auto;
}
.mobile-nav.open{transform:none;opacity:1;pointer-events:auto}
.mobile-nav a{display:block;padding:.8rem .25rem;border-bottom:1px solid var(--line);font-size:.95rem;font-weight:500}
.mobile-nav a:last-child{border-bottom:0}

/* ---------- hero ---------- */
.hero{position:relative;min-height:min(88vh,820px);display:flex;align-items:flex-end;color:#fff;overflow:hidden;background:var(--ink)}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center 42%}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,23,41,.78) 0%,rgba(10,23,41,.45) 42%,rgba(10,23,41,.88) 100%),
             linear-gradient(100deg,rgba(10,23,41,.9) 0%,rgba(10,23,41,.35) 62%,rgba(10,23,41,.55) 100%);
}
.hero-inner{position:relative;z-index:1;width:100%;padding-bottom:clamp(56px,7vw,88px);padding-top:calc(var(--nav-h) + 60px)}
.hero-tag{
  display:inline-flex;align-items:center;gap:.6rem;font-family:var(--f-mono);font-size:.72rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-soft);
  border:1px solid rgba(127,223,236,.35);padding:.4rem .8rem;border-radius:var(--radius);
  background:rgba(0,176,200,.08);margin-bottom:1.6rem;
}
.hero h1{max-width:16ch;margin-bottom:1.4rem}
.hero h1 em{font-style:normal;color:var(--cyan-soft)}
.hero .lede{max-width:56ch;color:rgba(255,255,255,.8)}
.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:2.2rem}
.hero-meta{display:flex;flex-wrap:wrap;gap:2.4rem;margin-top:3rem;padding-top:1.75rem;border-top:1px solid rgba(255,255,255,.16)}
.hero-meta div{min-width:110px}
.hero-meta dt{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:.35rem}
.hero-meta dd{margin:0;font-size:1.35rem;font-weight:600;letter-spacing:-.01em}
.hero-meta dd span{font-size:.8rem;font-weight:400;color:rgba(255,255,255,.55);margin-left:.3rem}
.hero-proof{position:absolute;right:28px;bottom:clamp(56px,7vw,88px);z-index:1;display:flex;flex-direction:column;gap:.75rem;align-items:flex-end}
.hero-proof .chip{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.1em;color:rgba(255,255,255,.6);border-left:1px solid rgba(255,255,255,.25);padding-left:.7rem}

/* ---------- temperature ladder ---------- */
.temp-ladder{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.temp-cell{background:#fff;padding:1.6rem 1.4rem;position:relative;transition:background .2s}
.temp-cell:hover{background:var(--ice)}
.temp-cell .t{font-family:var(--f-mono);font-size:clamp(1.5rem,2.4vw,2rem);font-weight:600;color:var(--navy);letter-spacing:-.02em;line-height:1.1}
.temp-cell .t sup{font-size:.5em;vertical-align:super}
.temp-cell .tier{font-size:.82rem;font-weight:600;margin-top:.55rem;color:var(--ink)}
.temp-cell .use{font-size:.78rem;color:var(--muted);margin-top:.35rem;line-height:1.6}
.temp-cell .bar{height:3px;margin-top:1rem;background:var(--line);position:relative;overflow:hidden}
.temp-cell .bar i{position:absolute;inset:0;background:var(--cyan);transform-origin:left;transform:scaleX(var(--fill,.5))}
.temp-cell[data-tier="1"]{--fill:.25}
.temp-cell[data-tier="2"]{--fill:.5}
.temp-cell[data-tier="3"]{--fill:.75}
.temp-cell[data-tier="4"]{--fill:1}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:1.25rem}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  display:flex;flex-direction:column;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.card-media{aspect-ratio:4/3;background:var(--paper-2);overflow:hidden;position:relative}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.card:hover .card-media img{transform:scale(1.035)}
.card-body{padding:1.5rem 1.5rem 1.6rem;display:flex;flex-direction:column;flex:1}
.card-code{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:.6rem}
.card-body h3{margin-bottom:.55rem;font-size:1.075rem}
.card-body p{font-size:.875rem;color:var(--muted);line-height:1.75;margin-bottom:1.1rem}
.card-body .link-arrow{margin-top:auto;font-size:.82rem}
.card-tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1rem}
.tag{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.05em;padding:.22rem .5rem;background:var(--ice);color:var(--navy-2);border-radius:var(--radius)}

/* icon cards */
.icon-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.75rem 1.6rem;transition:all .25s}
.icon-card:hover{border-color:var(--cyan);box-shadow:var(--shadow-sm)}
.icon-card .ico{width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:var(--ice);color:var(--navy);border-radius:var(--radius);margin-bottom:1.15rem}
.icon-card .ico svg{width:22px;height:22px}
.icon-card h3{font-size:1rem;margin-bottom:.5rem}
.icon-card p{font-size:.85rem;color:var(--muted);line-height:1.75}

/* ---------- split feature ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,5rem);align-items:center}
.split.rev{grid-template-columns:.95fr 1.05fr}
.split-media{position:relative;border-radius:var(--radius-lg);overflow:hidden;background:var(--paper-2);aspect-ratio:4/3}
.split-media img{width:100%;height:100%;object-fit:cover}
.split-media.square{aspect-ratio:1/1}
.split-copy h2{margin-bottom:1.1rem}
.fact-list{list-style:none;margin:1.75rem 0 0;padding:0;display:grid;gap:0}
.fact-list li{display:flex;gap:1rem;padding:1rem 0;border-top:1px solid var(--line)}
.fact-list li:last-child{border-bottom:1px solid var(--line)}
.fact-list .k{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;color:var(--cyan);text-transform:uppercase;flex:none;width:96px;padding-top:.15rem}
.fact-list .v{font-size:.92rem;color:var(--ink)}
.fact-list .v small{display:block;font-size:.8rem;color:var(--muted);margin-top:.2rem}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.12);border-radius:var(--radius-lg);overflow:hidden}
.stat{background:var(--ink);padding:2rem 1.75rem}
.bg-navy .stat{background:transparent}
.stat .n{font-family:var(--f-mono);font-size:clamp(1.9rem,3vw,2.6rem);font-weight:600;letter-spacing:-.03em;line-height:1;color:#fff}
.stat .n sup{font-size:.42em;color:var(--cyan-soft);vertical-align:super;margin-left:.1em}
.stat .l{font-size:.8rem;color:rgba(255,255,255,.6);margin-top:.7rem;line-height:1.55}

/* ---------- table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-lg);background:#fff}
table.spec{width:100%;border-collapse:collapse;font-size:.875rem;min-width:640px}
table.spec thead th{
  text-align:left;font-family:var(--f-mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);font-weight:500;padding:.95rem 1.25rem;background:var(--paper-2);border-bottom:1px solid var(--line);white-space:nowrap;
}
table.spec tbody td{padding:1.05rem 1.25rem;border-bottom:1px solid var(--line);vertical-align:top;color:var(--ink)}
table.spec tbody tr:last-child td{border-bottom:0}
table.spec tbody tr:hover{background:#fbfdff}
table.spec .code{font-family:var(--f-mono);font-weight:600;color:var(--navy);white-space:nowrap}
table.spec .sub{display:block;font-size:.75rem;color:var(--muted);margin-top:.2rem}
.temp-pill{display:inline-block;font-family:var(--f-mono);font-size:.78rem;padding:.18rem .55rem;border-radius:var(--radius);background:var(--ice);color:var(--navy);white-space:nowrap}
.temp-pill.deep{background:#e4f4f8;color:#036a7a}

/* ---------- badges / certifications ---------- */
.cert-row{display:flex;flex-wrap:wrap;gap:.75rem}
.cert{display:flex;align-items:center;gap:.6rem;border:1px solid var(--line);border-radius:var(--radius);padding:.7rem 1rem;background:#fff;font-size:.82rem;color:var(--navy)}
.cert b{font-family:var(--f-mono);font-size:.75rem;letter-spacing:.06em;color:var(--cyan)}
.cert.on-dark{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.16);color:rgba(255,255,255,.85)}

/* ---------- timeline ---------- */
.timeline{position:relative;margin-top:2.5rem;border-left:1px solid var(--line);padding-left:2rem;display:grid;gap:2.25rem}
.timeline-item{position:relative}
.timeline-item::before{content:"";position:absolute;left:-2.36rem;top:.45rem;width:10px;height:10px;border:2px solid var(--cyan);background:#fff;border-radius:50%}
.timeline-item .yr{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.1em;color:var(--cyan);margin-bottom:.35rem}
.timeline-item h3{font-size:1rem;margin-bottom:.4rem}
.timeline-item p{font-size:.875rem;color:var(--muted)}

/* ---------- quote / callout ---------- */
.callout{border-left:2px solid var(--cyan);padding:1.25rem 1.5rem;background:var(--ice);border-radius:0 var(--radius) var(--radius) 0}
.callout p{font-size:.95rem;color:var(--navy-2);line-height:1.8}
.callout strong{color:var(--navy)}

/* ---------- CTA band ---------- */
.cta-band{position:relative;background:linear-gradient(120deg,var(--navy) 0%,var(--ink) 100%);color:#fff;padding:clamp(52px,6vw,80px) 0;overflow:hidden}
.cta-band::after{
  content:"BRD";position:absolute;right:-1rem;bottom:-3.5rem;font-family:var(--f-mono);font-weight:700;
  font-size:clamp(8rem,18vw,15rem);color:rgba(255,255,255,.035);letter-spacing:-.04em;pointer-events:none;
}
.cta-band .wrap{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:2rem;flex-wrap:wrap}
.cta-band h2{margin-bottom:.6rem}
.cta-band p{color:rgba(255,255,255,.65);font-size:.95rem}
.cta-actions{display:flex;gap:.85rem;flex-wrap:wrap}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.62);font-size:.85rem;padding:clamp(48px,6vw,72px) 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr .8fr .8fr 1.2fr;gap:clamp(1.5rem,4vw,3.5rem);padding-bottom:clamp(36px,4vw,56px)}
.footer-brand img{height:24px;filter:brightness(0) invert(1);opacity:.92}
.footer-brand p{margin-top:1.1rem;max-width:34ch;line-height:1.8;font-size:.82rem}
.footer-col h4{font-size:.72rem;font-family:var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.4);margin-bottom:1rem;font-weight:500}
.footer-col a{display:block;padding:.32rem 0;color:rgba(255,255,255,.66);transition:color .18s}
.footer-col a:hover{color:var(--cyan-soft)}
.footer-contact p{display:flex;gap:.6rem;line-height:1.7;margin-bottom:.6rem;color:rgba(255,255,255,.66)}
.footer-contact .lbl{color:rgba(255,255,255,.35);flex:none;width:3.2em}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:1.4rem 0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.78rem;color:rgba(255,255,255,.4)}
.footer-bottom a{color:rgba(255,255,255,.5)}
.footer-bottom a:hover{color:#fff}
.footer-bottom .icp a{margin-left:.75rem}

/* ---------- page hero (inner pages) ---------- */
.page-hero{position:relative;background:linear-gradient(150deg,var(--navy) 0%,var(--ink) 78%);color:#fff;padding:calc(var(--nav-h) + clamp(56px,7vw,88px)) 0 clamp(48px,6vw,72px);overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-10%;top:-40%;width:60%;height:180%;background:radial-gradient(ellipse at center,rgba(0,176,200,.16),transparent 65%);pointer-events:none}
.page-hero .wrap{position:relative;z-index:1}
.page-hero h1{font-size:clamp(2rem,3.6vw,3rem);max-width:20ch;margin-bottom:1rem}
.page-hero p{max-width:62ch;color:rgba(255,255,255,.72);font-size:1rem;line-height:1.85}
.breadcrumb{display:flex;gap:.5rem;align-items:center;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;color:rgba(255,255,255,.45);margin-bottom:1.5rem;text-transform:uppercase}
.breadcrumb a:hover{color:var(--cyan-soft)}
.breadcrumb span{color:rgba(255,255,255,.3)}

/* ---------- prose ---------- */
.prose{max-width:72ch}
.prose h3{margin:2rem 0 .65rem;font-size:1.05rem}
.prose p{margin-bottom:1rem;color:var(--muted);line-height:1.9}
.prose ul{margin:0 0 1.2rem;padding-left:1.1rem;color:var(--muted)}
.prose li{margin-bottom:.5rem;line-height:1.8}
.prose strong{color:var(--ink)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(2rem,5vw,4.5rem);align-items:start}
.contact-item{display:flex;gap:1rem;padding:1.35rem 0;border-top:1px solid var(--line)}
.contact-item:last-child{border-bottom:1px solid var(--line)}
.contact-item .ico{width:38px;height:38px;flex:none;border-radius:var(--radius);background:var(--ice);display:flex;align-items:center;justify-content:center;color:var(--navy)}
.contact-item .ico svg{width:18px;height:18px}
.contact-item .lbl{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.3rem}
.contact-item .val{font-size:.95rem;font-weight:500;color:var(--ink);line-height:1.65}
.contact-item .val small{display:block;font-weight:400;font-size:.8rem;color:var(--muted);margin-top:.2rem}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:clamp(1.5rem,3vw,2.25rem);box-shadow:var(--shadow-sm)}
.form-card h3{margin-bottom:.4rem}
.form-card .hint{font-size:.82rem;color:var(--muted);margin-bottom:1.5rem}
.field{margin-bottom:1.1rem}
.field label{display:block;font-size:.78rem;font-weight:600;color:var(--navy);margin-bottom:.4rem}
.field label span{color:var(--cyan)}
.field input,.field textarea,.field select{
  width:100%;padding:.72rem .85rem;border:1px solid var(--line-strong);border-radius:var(--radius);
  font:inherit;font-size:.9rem;color:var(--ink);background:#fff;transition:border-color .18s,box-shadow .18s;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(0,176,200,.12)}
.field textarea{resize:vertical;min-height:110px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.form-note{font-size:.75rem;color:var(--muted);margin-top:.9rem;line-height:1.6}

/* ---------- misc ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}
.skip{position:absolute;left:-9999px;top:0;background:#fff;color:var(--navy);padding:.75rem 1rem;z-index:200}
.skip:focus{left:8px;top:8px}
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:1.15rem 0}
.faq summary{cursor:pointer;font-weight:600;font-size:.95rem;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--f-mono);color:var(--cyan);font-size:1.1rem;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:.85rem;font-size:.88rem;color:var(--muted);line-height:1.8;max-width:70ch}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .split,.split.rev{grid-template-columns:1fr;gap:2.25rem}
  .split-media{order:-1}
  .stats{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
  .footer-contact{grid-column:1/-1}
  .contact-grid{grid-template-columns:1fr}
  .hero-proof{display:none}
}
@media (max-width:820px){
  .nav,.header-cta{display:none}
  .menu-btn{display:flex}
  .temp-ladder{grid-template-columns:repeat(2,1fr)}
  .hero{min-height:min(92vh,760px)}
  .hero h1{max-width:14ch}
  .hero-meta{gap:1.5rem 2rem}
  .cta-band .wrap{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .wrap,.wrap-narrow{padding:0 20px}
  .header-inner{padding:0 20px}
  .grid-3,.grid-2,.grid-4{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
  .footer-brand{grid-column:1/-1}
  .footer-contact{grid-column:1/-1}
  .form-row{grid-template-columns:1fr}
  .hero-actions .btn{flex:1;justify-content:center}
  .temp-cell{padding:1.25rem 1.1rem}
  .brand img{height:23px}
}

/* ---------- logo swap / progressive reveal ---------- */
.site-header .logo-dark{display:none}
.site-header.is-solid .logo-dark{display:block}
.site-header.is-solid .logo-light{display:none}
html.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){html.js .reveal{opacity:1;transform:none;transition:none}}
.table-note{font-size:.78rem;color:var(--muted);margin-top:.75rem;line-height:1.7}

/* ---------- contrast fixes ---------- */
.bg-ink .icon-card,.bg-navy .icon-card{color:var(--ink)}
.bg-ink .lede,.bg-navy .lede{color:rgba(255,255,255,.72)}
.bg-ink .section-head h2,.bg-navy .section-head h2{color:#fff}
.hero h1{max-width:720px}
@media (max-width:820px){.hero h1{max-width:100%}}
.card-media.contain{background:#fff;padding:1.35rem}
.card-media.contain img{object-fit:contain}
.fact-list .k{width:104px;font-size:.68rem;letter-spacing:.06em}
.fact-list .v{word-break:break-word}
@media (max-width:640px){.fact-list .k{width:84px;font-size:.64rem}}

/* ---------- v2: five-step temperature ladder ---------- */
.temp-ladder{grid-template-columns:repeat(5,1fr)}
@media (max-width:1024px){.temp-ladder{grid-template-columns:repeat(3,1fr)}}
@media (max-width:820px){.temp-ladder{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.temp-ladder{grid-template-columns:1fr}}
.temp-cell .t{font-size:clamp(1.25rem,1.9vw,1.75rem)}

/* ---------- v2: material system cards ---------- */
.sys-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.6rem;transition:all .25s}
.sys-card:hover{border-color:var(--cyan);box-shadow:var(--shadow-sm)}
.sys-card .idx{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.14em;color:var(--cyan);margin-bottom:.9rem}
.sys-card h3{font-size:1rem;margin-bottom:.5rem}
.sys-card p{font-size:.85rem;color:var(--muted);line-height:1.75}

/* ---------- v2: spec panel (replaces photo on material pages) ---------- */
.spec-panel{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;color:#fff;
  background:linear-gradient(150deg,var(--navy) 0%,var(--ink) 72%);
  padding:clamp(1.6rem,3vw,2.4rem);aspect-ratio:4/3;display:flex;flex-direction:column;
}
.spec-panel::after{
  content:"";position:absolute;right:-18%;top:-30%;width:70%;height:120%;
  background:radial-gradient(ellipse at center,rgba(0,176,200,.22),transparent 66%);pointer-events:none;
}
.spec-panel .sp-title{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.18em;color:var(--cyan-soft);margin-bottom:1.4rem}
.spec-panel .sp-metric{font-family:var(--f-mono);font-size:clamp(2rem,4vw,3rem);font-weight:600;letter-spacing:-.03em;line-height:1}
.spec-panel .sp-metric .unit{font-size:.42em;color:var(--cyan-soft);margin-left:.15em}
.spec-panel .sp-label{font-size:.75rem;color:rgba(255,255,255,.55);margin-top:.6rem;margin-bottom:1.4rem}
.spec-panel .sp-rows{margin-top:auto;border-top:1px solid rgba(255,255,255,.15);position:relative;z-index:1}
.spec-panel .sp-row{display:flex;gap:1rem;padding:.62rem 0;border-bottom:1px solid rgba(255,255,255,.09);font-size:.78rem}
.spec-panel .sp-row:last-child{border-bottom:0}
.spec-panel .sp-k{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.06em;color:rgba(255,255,255,.42);flex:none;width:5.2em;padding-top:.12rem}
.spec-panel .sp-v{color:rgba(255,255,255,.88);line-height:1.5}

/* ---------- v2: coding steps ---------- */
.code-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.code-step{background:#fff;padding:1.6rem}
.code-step .n{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.14em;color:var(--cyan);margin-bottom:.7rem}
.code-step h3{font-size:.95rem;margin-bottom:.45rem}
.code-step p{font-size:.82rem;color:var(--muted);line-height:1.75}
@media (max-width:820px){.code-steps{grid-template-columns:1fr}}

/* ---------- v2: nav fits seven items ---------- */
.nav a{padding:.5rem .72rem;font-size:.84rem}
.header-actions{gap:.6rem}