/* ============================================================
   Sino Stirling — High-Tech Premium Design System
   Portable Ultra-Low Temperature Freezers (Stirling Engine)
   ============================================================ */

/* ---------- Tokens ---------- */
:root{
  /* Core palette */
  --bg:            #050810;
  --bg-2:          #080d1a;
  --bg-3:          #0b1220;
  --surface:       rgba(255,255,255,.035);
  --surface-2:     rgba(255,255,255,.055);
  --border:        rgba(120,180,255,.14);
  --border-strong: rgba(120,180,255,.30);

  /* Tech accents */
  --blue:   #1E90FF;
  --cyan:   #22D3EE;
  --ice:    #7DD3FC;
  --violet: #7C5CFF;
  --glow:   rgba(34,211,238,.55);
  --glow-b: rgba(30,144,255,.55);

  /* Text */
  --text:   #E8F0FA;
  --muted:  #93A4BF;
  --dim:    #64748B;

  /* Layout */
  --maxw: 1240px;
  --radius: 16px;
  --radius-s: 10px;
  --header-h: 74px;

  /* Motion */
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Inter","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--cyan);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--ice)}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{line-height:1.15;margin:0 0 .5em;letter-spacing:-.02em;font-weight:700}
p{margin:0 0 1em}
button{font:inherit}

/* ---------- Ambient background ---------- */
body::before{
  content:"";
  position:fixed; inset:0; z-index:-2;
  background:
    radial-gradient(1100px 620px at 78% -8%,  rgba(30,144,255,.16), transparent 60%),
    radial-gradient(900px 560px at 8% 12%,    rgba(34,211,238,.10), transparent 62%),
    radial-gradient(1000px 700px at 50% 108%, rgba(124,92,255,.12), transparent 60%),
    linear-gradient(180deg,#050810 0%,#070c17 40%,#050810 100%);
  pointer-events:none;
}
/* subtle grid overlay */
body::after{
  content:"";
  position:fixed; inset:0; z-index:-1;
  background-image:
    linear-gradient(rgba(120,180,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,180,255,.045) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  pointer-events:none;
}

/* ---------- Layout ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{position:relative;padding:104px 0}
.section-sm{padding:64px 0}
.center{text-align:center}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(5,8,16,.72);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.site-header.scrolled{background:rgba(5,8,16,.92)}
.header-inner{
  width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  display:grid;place-items:center;
  box-shadow:0 0 22px var(--glow-b);
  font-weight:800;font-size:15px;color:#04101f;letter-spacing:-.5px;
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-weight:800;font-size:17px;letter-spacing:.2px;color:#fff}
.brand-tag{font-size:10.5px;color:var(--muted);letter-spacing:1.4px;text-transform:uppercase}

.nav{display:flex;align-items:center;gap:6px}
.nav a{
  color:var(--muted);font-size:14.5px;font-weight:500;
  padding:9px 13px;border-radius:8px;transition:.2s var(--ease);
}
.nav a:hover{color:#fff;background:var(--surface-2)}
.nav a.active{color:var(--cyan);background:rgba(34,211,238,.10)}
.header-cta{display:flex;align-items:center;gap:10px}

.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;
  background:var(--surface-2);border:1px solid var(--border);
  color:var(--text);cursor:pointer;place-items:center;
}
.nav-toggle span{display:block;width:18px;height:2px;background:currentColor;margin:3px auto;border-radius:2px;transition:.25s var(--ease)}
.nav-toggle.open span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:12px 22px;border-radius:10px;font-weight:600;font-size:14.5px;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:all .25s var(--ease);text-decoration:none;
}
.btn-primary{
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  color:#03121f;box-shadow:0 6px 26px rgba(30,144,255,.32);
}
.btn-primary:hover{
  color:#03121f;transform:translateY(-2px);
  box-shadow:0 10px 34px rgba(34,211,238,.45);
}
.btn-ghost{
  background:var(--surface);border-color:var(--border-strong);color:var(--text);
}
.btn-ghost:hover{background:var(--surface-2);border-color:var(--cyan);color:#fff;transform:translateY(-2px)}
.btn-sm{padding:9px 16px;font-size:13.5px}

/* ---------- Typography helpers ---------- */
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:11.5px;font-weight:700;letter-spacing:2px;text-transform:uppercase;
  color:var(--cyan);margin-bottom:16px;
}
.kicker::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
.section-title{font-size:clamp(28px,4vw,44px);font-weight:800}
.section-title .grad{
  background:linear-gradient(135deg,#fff 10%,var(--ice) 55%,var(--cyan) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lede{font-size:17.5px;color:var(--muted);max-width:720px;line-height:1.7}
.center .lede{margin-left:auto;margin-right:auto}
.text-cyan{color:var(--cyan)}
.text-ice{color:var(--ice)}

.divider{
  height:1px;background:linear-gradient(90deg,transparent,var(--border-strong),transparent);
  margin:0;
}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;
  padding:calc(var(--header-h) + 60px) 0 80px;
  overflow:hidden;
}
#hero-canvas{
  position:absolute;inset:0;width:100%;height:100%;z-index:0;
  display:block;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:220px;z-index:1;
  background:linear-gradient(180deg,transparent,var(--bg));
  pointer-events:none;
}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(34px,5.2vw,62px);font-weight:800;margin-bottom:18px;letter-spacing:-.03em}
.hero h1 .grad{
  background:linear-gradient(135deg,#fff 0%,var(--ice) 45%,var(--cyan) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{font-size:18px;color:var(--muted);max-width:560px;margin-bottom:30px;line-height:1.7}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}

.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:520px}
.stat{
  padding:16px 18px;border-radius:12px;
  background:var(--surface);border:1px solid var(--border);
  backdrop-filter:blur(8px);
}
.stat-num{font-size:22px;font-weight:800;color:var(--cyan);line-height:1.1}
.stat-lbl{font-size:11.5px;color:var(--dim);letter-spacing:.6px;text-transform:uppercase;margin-top:4px}

/* hero visual */
.hero-visual{position:relative;display:grid;place-items:center}
.hero-visual img{
  width:100%;max-width:520px;
  filter:drop-shadow(0 30px 60px rgba(0,0,0,.6));
  animation:float 7s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.hero-ring{
  position:absolute;width:120%;aspect-ratio:1;border-radius:50%;
  border:1px solid rgba(34,211,238,.18);
  animation:spin 26s linear infinite;pointer-events:none;
}
.hero-ring::before{
  content:"";position:absolute;top:-5px;left:50%;transform:translateX(-50%);
  width:10px;height:10px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 18px var(--glow);
}
.hero-ring.delay{width:96%;animation-duration:34s;animation-direction:reverse;border-color:rgba(30,144,255,.20)}
@keyframes spin{to{transform:rotate(360deg)}}

/* scroll cue */
.scroll-cue{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  font-size:11px;letter-spacing:2px;color:var(--dim);text-transform:uppercase;
}
.scroll-cue i{
  width:22px;height:36px;border:1.5px solid var(--border-strong);border-radius:12px;position:relative;display:block;
}
.scroll-cue i::after{
  content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);
  width:3px;height:7px;border-radius:2px;background:var(--cyan);
  animation:cue 1.8s ease-in-out infinite;
}
@keyframes cue{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,12px)}}

/* ---------- Cards ---------- */
.card{
  position:relative;padding:30px;border-radius:var(--radius);
  background:linear-gradient(160deg,var(--surface-2),var(--surface));
  border:1px solid var(--border);
  transition:transform .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,rgba(34,211,238,.5),transparent 40%,rgba(30,144,255,.35));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  opacity:0;transition:opacity .35s var(--ease);pointer-events:none;
}
.card:hover{transform:translateY(-6px);border-color:var(--border-strong);box-shadow:0 22px 54px rgba(0,0,0,.5)}
.card:hover::before{opacity:1}
.card h3{font-size:19px;margin-bottom:10px;color:#fff}
.card p{color:var(--muted);font-size:15px;margin:0}
.card-icon{
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px;
  background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.25);
  font-size:21px;
}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

/* ---------- Product / model cards ---------- */
.models{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.model-card{
  display:flex;flex-direction:column;
  background:linear-gradient(170deg,rgba(255,255,255,.055),rgba(255,255,255,.02));
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  transition:transform .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
.model-card:hover{transform:translateY(-8px);border-color:var(--border-strong);box-shadow:0 26px 60px rgba(0,0,0,.55)}
.model-media{
  background:radial-gradient(circle at 50% 40%, rgba(34,211,238,.10), transparent 70%);
  padding:26px;display:grid;place-items:center;min-height:250px;
}
.model-media img{max-height:230px;width:auto;object-fit:contain;transition:transform .5s var(--ease)}
.model-card:hover .model-media img{transform:scale(1.05)}
.model-body{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
.model-name{font-size:20px;font-weight:800;color:#fff;margin-bottom:4px}
.model-vol{font-size:12.5px;color:var(--cyan);letter-spacing:1.2px;text-transform:uppercase;font-weight:700;margin-bottom:14px}
.model-specs{display:flex;flex-direction:column;gap:9px;margin-bottom:20px}
.model-specs li{display:flex;justify-content:space-between;gap:12px;font-size:13.5px;color:var(--muted);padding-bottom:9px;border-bottom:1px dashed rgba(120,180,255,.10)}
.model-specs li:last-child{border-bottom:none}
.model-specs b{color:var(--text);font-weight:600}
.model-actions{margin-top:auto;display:flex;gap:10px;flex-wrap:wrap}

/* ---------- Spec table ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius)}
.table-scroll .spec-table{min-width:760px}
.spec-wrap{
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  background:var(--surface);
}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table th,.spec-table td{padding:14px 20px;text-align:left;vertical-align:top;border-bottom:1px solid rgba(120,180,255,.09)}
.spec-table thead th{
  background:rgba(30,144,255,.09);color:var(--ice);font-weight:700;font-size:12.5px;
  letter-spacing:1px;text-transform:uppercase;
}
.spec-table tbody th{width:34%;color:var(--muted);font-weight:500}
.spec-table td{color:var(--text)}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:none}
.spec-table tbody tr:hover{background:rgba(34,211,238,.04)}

/* ---------- Feature list ---------- */
.feature-list{display:flex;flex-direction:column;gap:14px}
.feature-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--muted)}
.feature-list li::before{
  content:"";flex-shrink:0;width:20px;height:20px;margin-top:3px;border-radius:50%;
  background:rgba(34,211,238,.14);border:1px solid rgba(34,211,238,.4);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2322D3EE' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size:11px;background-repeat:no-repeat;background-position:center;
}

/* ---------- CTA band ---------- */
.cta-band{
  position:relative;padding:74px 0;margin-top:40px;
  border-radius:24px;overflow:hidden;text-align:center;
  background:linear-gradient(135deg,rgba(30,144,255,.16),rgba(34,211,238,.09) 50%,rgba(124,92,255,.14));
  border:1px solid var(--border-strong);
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(600px 300px at 50% 0%, rgba(34,211,238,.22), transparent 70%);
}
.cta-band .container{position:relative;z-index:1}
.cta-band h2{font-size:clamp(26px,3.6vw,40px);font-weight:800}
.cta-band p{color:var(--muted);font-size:17px;max-width:640px;margin:0 auto 28px}

/* ---------- Contact / form ---------- */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:44px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:16px}
.info-item{
  display:flex;gap:15px;align-items:flex-start;padding:18px 20px;
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  transition:border-color .25s var(--ease),transform .25s var(--ease);
}
.info-item:hover{border-color:var(--border-strong);transform:translateX(4px)}
.info-ico{
  width:40px;height:40px;flex-shrink:0;border-radius:10px;display:grid;place-items:center;font-size:18px;
  background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.22);
}
.info-label{font-size:11.5px;color:var(--dim);letter-spacing:1.2px;text-transform:uppercase;margin-bottom:3px}
.info-value{font-size:15.5px;color:var(--text);font-weight:600;word-break:break-word}
.info-value a{color:var(--text)}
.info-value a:hover{color:var(--cyan)}

.form-card{
  padding:34px;border-radius:var(--radius);
  background:linear-gradient(160deg,var(--surface-2),var(--surface));
  border:1px solid var(--border);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:7px;font-weight:600;letter-spacing:.3px}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border-radius:10px;
  background:rgba(5,8,16,.6);border:1px solid var(--border);
  color:var(--text);font-size:14.5px;font-family:inherit;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.14);
}
.field textarea{min-height:120px;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:var(--dim)}
.field select option{background:var(--bg-2)}
.form-note{font-size:12.5px;color:var(--dim);margin-top:14px;line-height:1.6}
.form-status{
  display:none;margin-top:16px;padding:13px 16px;border-radius:10px;font-size:14px;
  background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.3);color:var(--ice);
}
.form-status.show{display:block}
.form-status.error{background:rgba(255,90,90,.10);border-color:rgba(255,90,90,.3);color:#ffb4b4}

/* ---------- Footer ---------- */
.site-footer{
  margin-top:60px;padding:64px 0 28px;
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,transparent,rgba(8,13,26,.75));
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:38px;margin-bottom:44px}
.footer-grid h4{font-size:12.5px;letter-spacing:1.6px;text-transform:uppercase;color:var(--dim);margin-bottom:16px;font-weight:700}
.footer-grid li{margin-bottom:10px}
.footer-grid li a{color:var(--muted);font-size:14.5px}
.footer-grid li a:hover{color:var(--cyan)}
.footer-about p{color:var(--muted);font-size:14.5px;max-width:320px}
.footer-bottom{
  padding-top:24px;border-top:1px solid rgba(120,180,255,.10);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--dim);
}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  position:relative;padding:calc(var(--header-h) + 76px) 0 68px;
  text-align:center;overflow:hidden;
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(700px 380px at 50% 0%, rgba(30,144,255,.18), transparent 70%);
  pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:clamp(30px,4.6vw,52px);font-weight:800;margin-bottom:14px}
.page-hero p{color:var(--muted);font-size:18px;max-width:680px;margin:0 auto}

/* breadcrumb */
.crumb{display:flex;gap:9px;justify-content:center;align-items:center;font-size:13px;color:var(--dim);margin-bottom:18px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--cyan)}
.crumb span{opacity:.5}

/* ---------- Image frame ---------- */
.img-frame{
  border-radius:var(--radius);overflow:hidden;
  background:radial-gradient(circle at 50% 40%, rgba(34,211,238,.12), transparent 70%);
  border:1px solid var(--border);padding:30px;display:grid;place-items:center;
}
.img-frame img{max-height:340px;width:auto;object-fit:contain}
.img-frame.plain{background:rgba(255,255,255,.02);padding:0}
.img-frame.plain img{width:100%;max-height:none;border-radius:var(--radius)}

/* ---------- Badge ---------- */
.badge{
  display:inline-block;padding:5px 12px;border-radius:999px;font-size:11.5px;font-weight:700;
  letter-spacing:1.1px;text-transform:uppercase;
  background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.3);color:var(--cyan);
}
.badge.blue{background:rgba(30,144,255,.10);border-color:rgba(30,144,255,.3);color:var(--ice)}

/* ---------- Tech diagram row ---------- */
.tech-row{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}

/* ---------- Comparison highlight ---------- */
.hl{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:44px}
.hl-item{padding:24px;border-radius:14px;background:var(--surface);border:1px solid var(--border);text-align:center}
.hl-num{font-size:28px;font-weight:800;color:var(--cyan);line-height:1.1}
.hl-num small{font-size:14px;color:var(--muted);font-weight:600}
.hl-lbl{font-size:12.5px;color:var(--dim);margin-top:6px;letter-spacing:.5px}

/* ---------- Video showcase ---------- */
.video-showcase .video-frame{
  position:relative;
  aspect-ratio:16/9;
  width:100%;
  max-width:920px;
  margin:34px auto 0;
  border-radius:18px;
  overflow:hidden;
  background:#05080f;
  border:1px solid var(--border);
  box-shadow:0 24px 70px rgba(0,0,0,.55), 0 0 0 1px rgba(34,211,238,.06) inset;
  cursor:pointer;
}
.video-showcase .video-poster{
  position:absolute;inset:0;
  width:100%;height:100%;object-fit:cover;
  display:block;
  filter:saturate(1.05) contrast(1.02);
}
.video-showcase .video-frame::after{
  /* subtle darkening + glow so the play button reads on any frame */
  content:"";position:absolute;inset:0;
  background:radial-gradient(120% 120% at 50% 50%, rgba(8,12,22,.18), rgba(5,8,15,.55));
  pointer-events:none;
}
.video-showcase .video-play{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:84px;height:84px;border-radius:50%;
  display:grid;place-items:center;
  background:rgba(30,144,255,.16);
  border:1px solid rgba(34,211,238,.55);
  box-shadow:0 0 0 8px rgba(34,211,238,.10), 0 10px 30px rgba(0,0,0,.5);
  backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
  cursor:pointer;z-index:2;
  transition:transform .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease);
}
.video-showcase .video-play::before{
  content:"";
  width:0;height:0;margin-left:6px;
  border-style:solid;border-width:15px 0 15px 26px;
  border-color:transparent transparent transparent #eaf6ff;
  filter:drop-shadow(0 1px 3px rgba(0,0,0,.4));
}
.video-showcase .video-frame:hover .video-play{
  transform:translate(-50%,-50%) scale(1.07);
  background:rgba(30,144,255,.28);
  box-shadow:0 0 0 12px rgba(34,211,238,.14), 0 12px 34px rgba(0,0,0,.55);
}
.video-showcase .video-play:hover{background:rgba(30,144,255,.34)}
.video-showcase .video-play:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
.video-showcase .video-badge{
  position:absolute;left:16px;top:16px;z-index:2;
  font-size:11.5px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;
  color:#eaf6ff;background:rgba(5,8,15,.55);
  border:1px solid rgba(34,211,238,.35);
  padding:6px 12px;border-radius:999px;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
}
.video-showcase .video-frame video{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#000;z-index:3}
.video-showcase .video-caption{margin:18px auto 0;max-width:760px;text-align:center;color:var(--muted);font-size:14.5px}

/* ---------- Responsive ---------- */
/* Tablet / small-laptop: switch to hamburger nav before the inline
   menu gets cramped (brand + 7 links + CTA overflows below ~1024px). */
@media (max-width:1024px){
  .nav{
    position:fixed;top:var(--header-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    padding:16px 20px 22px;
    background:rgba(5,8,16,.97);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    border-bottom:1px solid var(--border);
    transform:translateY(-14px);opacity:0;pointer-events:none;transition:.28s var(--ease);
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
  }
  .nav.open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:13px 14px;font-size:15px}
  .nav-toggle{display:grid}
  .header-cta .btn-ghost{display:none}
}
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:40px;text-align:center}
  .hero-sub{margin-left:auto;margin-right:auto}
  .hero-actions,.hero-stats{justify-content:center}
  .hero-stats{max-width:none}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .hl{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
}
@media (max-width:920px){
  .models{grid-template-columns:1fr;max-width:520px;margin-left:auto;margin-right:auto}
  .grid-3{grid-template-columns:1fr}
  .tech-row{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr;gap:34px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section{padding:76px 0}
}
@media (max-width:760px){
  .hero{min-height:auto;padding:calc(var(--header-h) + 44px) 0 60px}
  .hero-stats{grid-template-columns:1fr;gap:10px}
  .hero-visual{display:none}
  .form-row{grid-template-columns:1fr}
  .grid-2,.grid-4,.hl{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .spec-table th,.spec-table td{padding:11px 13px;font-size:13.5px}
  .spec-table tbody th{width:44%}
  .scroll-cue{display:none}
  .form-card{padding:24px}
}
@media (max-width:420px){
  .brand-tag{display:none}
  .section{padding:60px 0}
  .container{padding:0 18px}
  .header-inner{padding:0 16px}
  .hero-actions .btn,.model-actions .btn{flex:1 1 auto;width:100%}
  .hero-actions{width:100%}
  .model-actions{width:100%}
  .cta-band .btn{flex:1 1 auto;width:100%}
  .btn{font-size:14px}
}

/* ---------- Accessibility ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}