/* =========================================================
   VTWING — FPV Components Manufacturer
   Global stylesheet
   ========================================================= */

:root{
  --ink:#0B1219;
  --ink-2:#101C27;
  --ink-3:#16242F;
  --paper:#FFFFFF;
  --soft:#F5F7F9;
  --line:#E2E8EE;
  --line-dark:rgba(255,255,255,.10);

  --text:#16202A;
  --muted:#5C6B7A;
  --muted-dark:#93A6B6;

  --accent:#0FB5D6;
  --accent-deep:#0A8BA6;
  --lime:#B7F03C;

  --radius:14px;
  --radius-lg:22px;
  --shadow:0 1px 2px rgba(16,28,39,.04),0 12px 32px -12px rgba(16,28,39,.16);
  --sans:"Inter","Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --wrap:1200px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--text);
  font-family:var(--sans);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}

h1,h2,h3,h4{margin:0;line-height:1.15;letter-spacing:-.02em;font-weight:800}
h1{font-size:clamp(2.1rem,4.4vw,3.5rem)}
h2{font-size:clamp(1.65rem,2.6vw,2.35rem)}
h3{font-size:1.12rem;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}

html,body{margin:0}
/* horizontal-wobble fuse: nothing may ever widen the page sideways;
   clip keeps position:sticky working (hidden kept as fallback) */
html{overflow-x:hidden;overflow-x:clip}
body{overflow-x:hidden;overflow-x:clip}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.sect{padding:88px 0}
.sect-sm{padding:56px 0}
.soft{background:var(--soft)}
.dark{background:var(--ink);color:#E7EEF4}
.dark h1,.dark h2,.dark h3{color:#fff}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:.72rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent-deep);margin-bottom:18px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:currentColor;opacity:.6}
.dark .eyebrow{color:var(--accent)}
.lead{font-size:1.06rem;color:var(--muted);max-width:68ch}
.dark .lead{color:var(--muted-dark)}

.sec-head{max-width:760px;margin-bottom:44px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 24px;border-radius:10px;border:1px solid transparent;
  font-size:.92rem;font-weight:700;letter-spacing:.01em;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#04212A;box-shadow:0 8px 24px -10px rgba(15,181,214,.9)}
.btn-primary:hover{background:#22c6e6}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--ink-3)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--ink);background:#fff}
.dark .btn-ghost,.hero .btn-ghost,.page-hero .btn-ghost,.cta-band .btn-ghost{border-color:rgba(255,255,255,.22);color:#fff}
.dark .btn-ghost:hover,.hero .btn-ghost:hover,.page-hero .btn-ghost:hover,.cta-band .btn-ghost:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.4)}
.btn-lime{background:var(--lime);color:#14210A}
.btn-sm{padding:10px 16px;font-size:.84rem}
.btn-row{display:flex;flex-wrap:wrap;gap:14px}

/* ---------- header ---------- */
.header{
  position:sticky;top:0;z-index:80;background:rgba(11,18,25,.92);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-in{display:flex;align-items:center;gap:28px;height:74px}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand img{width:34px;height:34px}
.brand-txt{display:flex;flex-direction:column;line-height:1}
.brand-name{font-size:1.06rem;font-weight:800;letter-spacing:.14em;color:#fff}
.brand-sub{font-size:.52rem;letter-spacing:.24em;color:#7F94A6;margin-top:5px;text-transform:uppercase}

.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav>li{list-style:none;position:relative}
.nav a{
  display:inline-flex;align-items:center;gap:6px;padding:9px 13px;border-radius:8px;
  font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#C9D6E2;
  transition:color .15s,background .15s;
}
.nav a:hover,.nav a.active{color:#fff;background:rgba(255,255,255,.07)}
.nav li.has-drop>a::after{
  content:"";width:5px;height:5px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
  transform:rotate(45deg) translateY(-1px);margin-left:2px;opacity:.7;
}
.drop{
  position:absolute;top:calc(100% + 10px);left:0;min-width:262px;padding:8px;margin:0;list-style:none;
  background:#fff;border-radius:14px;box-shadow:0 24px 60px -20px rgba(6,14,22,.45);
  border:1px solid var(--line);
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:.18s ease;
}
.nav li.has-drop:hover .drop,.nav li.has-drop:focus-within .drop{opacity:1;visibility:visible;transform:none}
.drop a{
  display:block;color:var(--text);text-transform:none;letter-spacing:0;font-weight:600;
  font-size:.9rem;padding:9px 12px;border-radius:8px;
}
.drop a:hover{background:var(--soft);color:var(--ink)}
.drop small{display:block;font-weight:500;font-size:.74rem;color:var(--muted);letter-spacing:0}
.header-cta{margin-left:14px}
.burger{display:none;margin-left:auto;background:none;border:0;color:#fff;padding:8px}
.burger span{display:block;width:22px;height:2px;background:currentColor;margin:4px 0;transition:.2s}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--ink);color:#fff;overflow:hidden}
.hero-photo{
  background:#0B1219 url('../img/site/photo-mountains.webp') center 30%/cover no-repeat;
}
.hero-photo::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(8,15,21,.97) 6%,rgba(8,15,21,.9) 48%,rgba(8,15,21,.5) 100%);
}
.hero-photo .hero-in h1,.hero-photo .hero-in p,.hero-photo .hero-in b,.hero-photo .hero-in span{text-shadow:0 1px 14px rgba(5,10,14,.55)}

/* inner-page hero with photo */
.page-hero.quad-photo{
  background:linear-gradient(100deg,rgba(8,15,21,.95) 10%,rgba(8,15,21,.8) 55%,rgba(8,15,21,.45) 100%),
             url('../img/site/photo-quad.webp') center 38%/cover no-repeat;
}
.hero-photo .hero-in{position:relative;z-index:2}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(760px 420px at 78% 8%,rgba(15,181,214,.22),transparent 70%),
    radial-gradient(520px 380px at 12% 92%,rgba(183,240,60,.10),transparent 70%);
}
.hero::after{
  content:"";position:absolute;inset:0;opacity:.34;
  background-image:linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 60% 40%,#000 20%,transparent 78%);
}
.hero-in{position:relative;z-index:2;display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;padding:86px 0 78px}
.hero h1{margin-bottom:22px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:#A9BACA;font-size:1.08rem;max-width:52ch}
.hero-kpis{display:flex;gap:38px;margin-top:42px;padding-top:28px;border-top:1px solid rgba(255,255,255,.12)}
.hero-kpis b{display:block;font-size:1.7rem;letter-spacing:-.03em;color:#fff}
.hero-kpis span{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:#7F94A6}
.hero-art{position:relative}
.hero-art svg{width:100%;height:auto;filter:drop-shadow(0 24px 60px rgba(0,0,0,.5))}

/* ---------- trust bar ---------- */
.trustbar{background:#080F15;border-top:1px solid rgba(255,255,255,.07)}
.trust-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;padding:20px 0}
.trust-item{display:flex;align-items:center;gap:10px;font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:#8FA3B4;font-weight:600}
.trust-item svg{width:16px;height:16px;stroke:var(--accent);fill:none;stroke-width:1.7}

/* ---------- grids & 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(--radius-lg);
  padding:28px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#CFDBE5}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);font-size:.94rem}
.card-num{font-family:var(--mono);font-size:.72rem;color:var(--accent-deep);letter-spacing:.12em;margin-bottom:16px;display:block}

.icon-tile{
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px;
  background:linear-gradient(160deg,#E8F7FB,#F4FBF2);border:1px solid #D9EDF3;
}
.icon-tile svg{width:24px;height:24px;stroke:var(--accent-deep);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}

/* category cards */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cat-card{
  position:relative;display:flex;flex-direction:column;justify-content:flex-end;
  min-height:246px;border-radius:16px;overflow:hidden;padding:22px;
  background:linear-gradient(165deg,#0F1E28,#0A131A);
  border:1px solid #1D2C38;color:#fff;transition:transform .2s,border-color .2s;
}
.cat-card:hover{transform:translateY(-4px);border-color:rgba(15,181,214,.55)}
.cat-card .cat-art{position:absolute;inset:0;display:grid;place-items:center;opacity:.9}
.cat-card .cat-art svg{width:118px;height:118px;transform:translateY(-26px)}
.cat-card .cat-art img{width:100%;height:100%;object-fit:cover}
.cat-card:has(.cat-art img)::after{
  background:linear-gradient(to top,rgba(8,15,21,.94) 22%,rgba(8,15,21,.34) 60%,rgba(8,15,21,.06));
}
.cat-card::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(to top,rgba(8,15,21,.96) 16%,rgba(8,15,21,.15) 72%,transparent);
}
.cat-card .cat-txt{position:relative;z-index:2}
.cat-card h3{font-size:1rem;margin-bottom:5px;color:#fff}
.cat-card p{font-size:.78rem;color:#8FA3B4;margin:0}
.cat-card .go{
  position:absolute;top:16px;right:16px;z-index:2;width:30px;height:30px;border-radius:50%;
  display:grid;place-items:center;border:1px solid rgba(255,255,255,.22);
  font-size:.8rem;transition:.18s;
}
.cat-card:hover .go{background:var(--accent);border-color:var(--accent);color:#04212A}
.cat-card.wide{grid-column:span 2}

/* product cards */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.prod{
  background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s,border-color .2s;
}
.prod:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#CEDAE4}
.prod-media{
  position:relative;aspect-ratio:16/10;display:grid;place-items:center;
  background:
    radial-gradient(120% 90% at 50% 0%,#12232E 0%,#0B1219 70%);
  border-bottom:1px solid var(--line);
}
.prod-media::before{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:26px 26px;
}
.prod-media svg{width:112px;height:112px;position:relative;z-index:2}
.prod-media .prod-photo{
  width:100%;height:100%;object-fit:contain;background:#F4F7FA;
  padding:14px;position:relative;z-index:2;
}
.prod-media:has(.prod-photo)::before{display:none}
.prod-media:has(.prod-photo){
  background:#F4F7FA;
}
.prod-flag{
  position:absolute;top:12px;left:12px;z-index:3;font-size:.62rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;padding:5px 9px;border-radius:5px;background:rgba(183,240,60,.16);
  color:var(--lime);border:1px solid rgba(183,240,60,.35);
}
.prod-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.prod-sku{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--muted);margin-bottom:7px}
.prod h3{font-size:1.02rem;margin-bottom:12px}
.spec{list-style:none;margin:0 0 18px;padding:0;font-size:.82rem;color:var(--muted)}
.spec li{display:flex;gap:8px;padding:3px 0}
.spec li::before{content:"";flex:0 0 auto;width:5px;height:5px;border-radius:50%;background:var(--accent);margin-top:8px;opacity:.75}
.prod-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:16px;border-top:1px solid var(--line)}
.stock{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:#1F8A5B;font-weight:700;display:flex;align-items:center;gap:6px}
.stock::before{content:"";width:6px;height:6px;border-radius:50%;background:#25A16A}
.stock.odm{color:#8A6A1F}
.stock.odm::before{background:#D8A22A}
.prod-foot a{font-size:.8rem;font-weight:700;color:var(--ink);display:inline-flex;align-items:center;gap:6px}
.prod-foot a:hover{color:var(--accent-deep)}

/* split blocks */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split.wide-left{grid-template-columns:1.15fr .85fr}
.figure{
  border-radius:var(--radius-lg);overflow:hidden;background:linear-gradient(160deg,#0E1D27,#0A131A);
  border:1px solid #1B2A36;padding:26px;position:relative;
}
.figure::before{
  content:"";position:absolute;inset:0;opacity:.4;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure svg{position:relative;width:100%;height:auto}
.figure.photo{padding:12px}
.figure .fig-img{position:relative;display:block;width:100%;height:auto;border-radius:10px;z-index:2}
.figcap{position:relative;margin-top:14px;font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:#6F8698;text-transform:uppercase}

/* photo grid (factory floor) */
.photo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.photo-grid figure{margin:0;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff}
.photo-grid img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .25s}
.photo-grid figure:hover img{transform:scale(1.03)}
.photo-grid figcaption{padding:12px 14px;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);border-top:1px solid var(--line)}
@media(max-width:900px){.photo-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.photo-grid{grid-template-columns:1fr}}

/* stat band */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.1);border-radius:16px;overflow:hidden}
.stat{background:var(--ink);padding:30px 26px}
.stat b{display:block;font-size:2.1rem;letter-spacing:-.03em;color:#fff;line-height:1}
.stat b i{font-style:normal;color:var(--accent);font-size:1.1rem;margin-left:2px}
.stat span{display:block;margin-top:10px;font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:#8298A9}

/* checklist */
.checks{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.checks li{display:flex;gap:12px;font-size:.95rem;color:var(--text)}
.checks li svg{flex:0 0 auto;width:19px;height:19px;margin-top:3px;stroke:var(--accent-deep);fill:none;stroke-width:2.2}
.dark .checks li{color:#C6D4E0}
.dark .checks li svg{stroke:var(--accent)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:s}
.step{padding:0 26px 0 0;position:relative}
.step::before{
  counter-increment:s;content:"0" counter(s);
  font-family:var(--mono);font-size:.74rem;letter-spacing:.14em;color:var(--accent-deep);display:block;margin-bottom:14px;
}
.step h4{font-size:.98rem;margin:0 0 8px}
.step p{font-size:.86rem;color:var(--muted);margin:0}

/* CTA band */
.cta-band{position:relative;background:linear-gradient(120deg,#0B1219 0%,#102330 55%,#0B1219 100%);color:#fff;overflow:hidden}
.cta-band.photo{
  background:linear-gradient(100deg,rgba(8,15,21,.94) 8%,rgba(8,15,21,.78) 55%,rgba(8,15,21,.42) 100%),
             url('../img/site/photo-lift.webp') center 42%/cover no-repeat;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(600px 300px at 82% 50%,rgba(15,181,214,.25),transparent 70%);
}
.cta-band .wrap{position:relative;z-index:2}
.cta-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:32px;padding:64px 0}
.cta-in h2{margin-bottom:8px}
.cta-in p{color:#9FB2C2;margin:0;max-width:56ch}

/* ---------- page hero (inner pages) ---------- */
.page-hero{background:var(--ink);color:#fff;position:relative;overflow:hidden;padding:64px 0 58px}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(680px 340px at 82% 0%,rgba(15,181,214,.20),transparent 70%);
}
.page-hero .wrap{position:relative;z-index:2}
.crumb{font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:#7F94A6;margin-bottom:18px}
.crumb a:hover{color:#fff}
.crumb span{color:#3E5B6E;margin:0 8px}
.page-hero h1{max-width:22ch;margin-bottom:16px}
.page-hero p{color:#A9BACA;max-width:62ch}

/* filter tabs */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:34px}
.tab{
  padding:9px 15px;border-radius:999px;border:1px solid var(--line);background:#fff;
  font-size:.8rem;font-weight:600;color:var(--muted);cursor:pointer;transition:.15s;
}
.tab:hover{border-color:#C4D3DE;color:var(--text)}
.tab.on{background:var(--ink);border-color:var(--ink);color:#fff}

/* table */
.table-wrap{border:1px solid var(--line);border-radius:14px;overflow:auto}
table{width:100%;border-collapse:collapse;font-size:.88rem;min-width:560px}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line)}
th{background:var(--soft);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}
tbody tr:last-child td{border-bottom:0}
td:first-child{font-weight:600}

/* accordion */
.acc{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.acc details{border-bottom:1px solid var(--line)}
.acc details:last-child{border-bottom:0}
.acc summary{
  cursor:pointer;padding:18px 22px;font-weight:700;font-size:.96rem;display:flex;justify-content:space-between;gap:16px;
  list-style:none;
}
.acc summary::-webkit-details-marker{display:none}
.acc summary::after{content:"+";color:var(--accent-deep);font-weight:400;font-size:1.2rem;line-height:1}
.acc details[open] summary::after{content:"–"}
.acc .acc-body{padding:0 22px 20px;color:var(--muted);font-size:.92rem}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px;box-shadow:var(--shadow)}
.field{margin-bottom:16px}
.field label{display:block;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:7px}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:.94rem;
  background:#FCFDFE;color:var(--text);transition:border-color .15s,box-shadow .15s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(15,181,214,.15);background:#fff;
}
.field textarea{min-height:120px;resize:vertical}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:.76rem;color:var(--muted);margin-top:14px}
.form-msg{margin-top:14px;font-size:.86rem;color:#1F8A5B;font-weight:600;display:none}
.form-msg.on{display:block}

.person{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.person:last-child{border-bottom:0}
.avatar{
  flex:0 0 auto;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;
  background:var(--soft);border:1px solid var(--line);font-weight:800;color:var(--accent-deep);font-size:.9rem;
}
.person h4{margin:0 0 3px;font-size:.98rem}
.person .role{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.person a{display:inline-block;font-size:.86rem;color:var(--accent-deep);font-weight:600;margin-right:14px}
.person a:hover{text-decoration:underline}

.map-card{
  border-radius:var(--radius-lg);overflow:hidden;border:1px solid #1B2A36;background:#0C1720;padding:24px;position:relative;
}
.map-card svg{width:100%;height:auto}

/* blog */
.post{border-top:1px solid var(--line);padding:40px 0}
.post:first-of-type{border-top:0}
.post-thumb{width:100%;max-width:720px;display:block;border-radius:14px;border:1px solid var(--line);margin-bottom:22px}
.post-meta{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.post h2{font-size:1.55rem;margin-bottom:14px}
.post p{color:#3C4A57;max-width:74ch}
.post ul{color:#3C4A57;max-width:74ch}

/* footer */
.footer{background:#080F15;color:#93A6B6;padding:64px 0 0;font-size:.9rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:40px;padding-bottom:48px}
.footer h4{color:#fff;font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;margin:0 0 16px}
.footer ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer a:hover{color:#fff}
.footer .brand{margin-bottom:16px}
.footer .brand-name{font-size:1rem}
.foot-about{max-width:34ch;line-height:1.7;color:#8195A6}
.foot-contact{display:grid;gap:10px;margin-top:18px}
.foot-contact div{display:flex;gap:10px;align-items:flex-start;font-size:.86rem}
.foot-contact svg{flex:0 0 auto;width:15px;height:15px;margin-top:4px;stroke:var(--accent);fill:none;stroke-width:1.7}
.social{display:flex;gap:9px;margin-top:20px}
.social a{
  width:33px;height:33px;border-radius:8px;display:grid;place-items:center;
  border:1px solid rgba(255,255,255,.14);transition:.16s;
}
.social a:hover{background:var(--accent);border-color:var(--accent);color:#04212A}
.social svg{width:15px;height:15px;fill:currentColor}
.foot-bot{
  border-top:1px solid rgba(255,255,255,.08);padding:22px 0;display:flex;flex-wrap:wrap;
  justify-content:space-between;gap:12px;font-size:.78rem;color:#6E8394;
}

/* reveal */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
/* grid children must be allowed to shrink below their content width,
   otherwise a wide table/image inside a 1fr column stretches the whole page */
.split>*,.g2>*,.g3>*,.g4>*,.steps>*,.foot-grid>*,.contact-grid>*,
.hero-in>*,.prod-grid>*,.cat-grid>*,.photo-grid>*{min-width:0}
.split>div{min-width:0}

@media (max-width:1080px){
  .hero-in{grid-template-columns:1fr;gap:40px;padding:64px 0 60px}
  .hero-art{max-width:520px}
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .cat-card.wide{grid-column:span 1}
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .g4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);gap:32px}
  .split,.split.wide-left,.contact-grid{grid-template-columns:1fr;gap:36px}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .nav{
    position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;
    background:#0B1219;padding:16px 24px 28px;border-bottom:1px solid rgba(255,255,255,.1);
    max-height:calc(100vh - 74px);overflow:auto;display:none;
  }
  .nav.open{display:flex}
  .nav a{padding:13px 10px;font-size:.86rem}
  .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;background:transparent;border:0;padding:0 0 8px 12px;min-width:0}
  .drop a{color:#A9BACA;padding:9px 10px;border-left:1px solid rgba(255,255,255,.14);border-radius:0}
  .drop a:hover{background:transparent;color:#fff}
  .drop small{color:#6E8394}
  .burger{display:block}
  .header-cta{display:none}
  .sect{padding:64px 0}
  .g2,.g3{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .hero-kpis{gap:24px;flex-wrap:wrap}
}
@media (max-width:640px){
  .wrap{padding:0 18px}
  /* long eyebrow text must be allowed to wrap on phones
     (inline-flex makes it one unbreakable line and stretches the hero) */
  .eyebrow{display:block;line-height:1.7;letter-spacing:.16em}
  .eyebrow::before{display:none}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .prod-grid{grid-template-columns:1fr}
  .g4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .f2{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .trust-in{justify-content:flex-start;gap:14px 26px}
  .cta-in{padding:48px 0}
  .form-card{padding:22px}
  /* typography & spacing for phones */
  h1{font-size:1.85rem}
  .hero h1,.page-hero h1{font-size:1.72rem;margin-bottom:16px}
  .hero-in{padding:56px 0 48px}
  h2{font-size:1.42rem}
  .lead{font-size:.98rem}
  .hero-kpis{display:grid;grid-template-columns:1fr 1fr;gap:20px 16px;margin-top:32px}
  .hero-kpis b{font-size:1.4rem}
  .btn{width:100%;text-align:center}
  .btn-row .btn{width:auto;min-width:46%;flex:1 1 auto}
  .figure{padding:14px}
  .figure.photo{padding:10px}
  .prod-body{padding:16px 16px 18px}
  .cat-card{min-height:190px}
  .cat-card .cat-txt{padding:14px}
  .table-wrap{border-radius:10px;border-left:0;border-right:0}
  table{font-size:.8rem;min-width:520px}
  th,td{padding:11px 14px}
  .page-hero{padding:48px 0 44px}
  .crumb{font-size:.68rem}
  .post-thumb{height:180px}
  .post{padding:30px 0}
  .photo-grid{gap:12px}
  .photo-grid figcaption{font-size:.6rem;padding:10px 12px}
  .cta-band .photo-cta-in{padding:56px 0}
  .g2{gap:28px}
  .split{gap:32px}
}

/* =========================================================
   MOBILE OVERHAUL — true phone experience (≤768px)
   全屏抽屉导航 / 双列产品网格 / 底部固定联系栏
   ========================================================= */
.nav-mask{
  position:fixed;inset:0;z-index:70;background:rgba(5,10,15,.55);
  opacity:0;pointer-events:none;transition:opacity .25s ease;
}
body.nav-open .nav-mask{opacity:1;pointer-events:auto}

@media (max-width:768px){
  /* backdrop-filter on .header turns it into the containing block for
     position:fixed descendants — the fullscreen nav drawer would be
     clamped to the 60px header bar. Use a solid bg instead. */
  .header{background:#0B1219;backdrop-filter:none}
  /* ---- sticky header stays, nav becomes full-screen drawer ---- */
  .header-in{height:60px;gap:12px}
  .brand img{width:30px;height:30px}
  .brand-name{font-size:.94rem;letter-spacing:.12em}
  .nav{
    position:fixed;inset:0;z-index:75;
    display:none;background:#0B1219;padding:78px 26px 40px;
    max-height:none;overflow-y:auto;border-bottom:0;
  }
  .nav.open{display:block}
  .nav>li{border-bottom:1px solid rgba(255,255,255,.08)}
  .nav>li:last-child{border-bottom:0}
  .nav>li>a{
    display:flex;align-items:center;justify-content:space-between;
    padding:16px 2px;font-size:1rem;letter-spacing:.08em;border-radius:0;
  }
  .nav a.active{background:transparent;color:var(--accent)}
  .drop{
    padding:0 0 14px 14px;border-left:1px solid rgba(255,255,255,.14);margin-bottom:6px;
  }
  .drop a{font-size:.92rem;padding:10px 8px}
  /* burger -> X */
  .burger{display:block;position:relative;z-index:85;width:44px;height:44px;margin-left:auto;padding:10px}
  .burger span{width:22px;height:2px;margin:5px 0}
  .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger.open span:nth-child(2){opacity:0}
  .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .header-cta{display:none}
  body.nav-open{overflow:hidden}

  /* ---- bottom quick-contact bar (standard mobile-site pattern) ---- */
  .m-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:65;display:flex;
    background:rgba(11,18,25,.96);border-top:1px solid rgba(255,255,255,.12);
    backdrop-filter:saturate(160%) blur(10px);
    padding:6px 8px calc(6px + env(safe-area-inset-bottom,0px));
  }
  .m-bar a{
    flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;
    padding:7px 4px;border-radius:10px;color:#C9D6E2;
    font-size:.66rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  }
  .m-bar a:active{background:rgba(255,255,255,.08)}
  .m-bar a:first-child{color:#7BE04B}
  .m-bar svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
  .m-bar a:first-child svg{fill:currentColor;stroke:none}
  body{padding-bottom:62px}
  .footer{padding-bottom:14px}

  /* ---- phone-first product grid: 2 columns, square media, trimmed specs ---- */
  .prod-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .prod{border-radius:12px}
  .prod-media{aspect-ratio:1/1}
  .prod-media .prod-photo{padding:8px}
  .prod-body{padding:12px 12px 14px}
  .prod h3{font-size:.88rem;margin-bottom:8px;line-height:1.3}
  .spec{margin-bottom:10px;font-size:.76rem}
  .spec li:nth-child(n+4){display:none}
  .prod-foot{padding-top:10px;gap:8px}
  .stock{font-size:.64rem}
  .prod-foot a{font-size:.74rem}
  .prod-sku{font-size:.62rem;margin-bottom:4px}
  .prod-flag{font-size:.56rem;padding:4px 7px}

  /* ---- bigger touch targets everywhere ---- */
  .tab{padding:11px 16px;font-size:.84rem}
  .btn{padding:14px 20px}
  .btn-row{gap:10px}
  .btn-row .btn{min-width:calc(50% - 5px)}
  .acc summary{padding:16px 16px}
  .acc .acc-body{padding:0 16px 18px}

  /* ---- spacing / typography polish ---- */
  .wrap{padding:0 16px}
  /* full-bleed tables must match the 16px wrap padding exactly,
     otherwise the negative margin pushes the right edge past the viewport */
  .table-wrap{margin-left:-16px;margin-right:-16px;border-left:0;border-right:0;border-radius:10px}
  .sect{padding:52px 0}
  .sect-sm{padding:40px 0}
  .sec-head{margin-bottom:30px}
  .eyebrow{margin-bottom:12px}
  h1{font-size:1.72rem}
  .hero h1,.page-hero h1{font-size:1.66rem}
  h2{font-size:1.36rem}
  .hero-in{padding:44px 0 40px;gap:30px}
  .hero p{font-size:.98rem}
  .hero-art{max-width:300px;margin:0 auto}
  .hero-kpis{margin-top:26px;padding-top:20px}
  .cat-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .cat-card{min-height:170px;border-radius:12px;padding:16px}
  .cat-card .cat-art svg{width:88px;height:88px;transform:translateY(-20px)}
  .cat-card .go{top:12px;right:12px}
  .stats .stat{padding:22px 16px}
  .stat b{font-size:1.6rem}
  .trust-item{font-size:.68rem;letter-spacing:.08em}
  .steps{gap:26px}
  .figure{padding:10px}
  .photo-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{gap:28px}
  .form-card{padding:20px;border-radius:16px}
  .map-card{padding:16px}
  .cta-in{padding:40px 0}
  .page-hero{padding:40px 0 36px}
  .post h2{font-size:1.3rem}
  .foot-grid{gap:30px}
  .foot-bot{flex-direction:column;gap:6px}
}

/* very narrow phones (≤360px): keep 2-col product grid but tighten */
@media (max-width:360px){
  .prod-grid{gap:10px}
  .prod h3{font-size:.88rem}
  .wrap{padding:0 12px}
  /* full-bleed tables must match the 12px wrap padding, or the page
     gets a 4px sideways wobble on 360px Android screens */
  .table-wrap{margin-left:-12px;margin-right:-12px}
}

/* ---- mobile icon/text ratio balance ----------------------------------
   Fixed-px icons next to rem-shrunk text drift out of proportion on
   phones: icons look oversized while captions get too small to read.
   Re-balance both sides; desktop is untouched. */
@media (max-width:768px){
  /* trust bar: icon was 1.5x the caption height */
  .trust-item{font-size:.72rem}
  .trust-item svg{width:14px;height:14px}
  /* category cards: photo covers most of the card on phones, so the
     scrim must go darker and the caption slightly larger to stay legible */
  .cat-card h3{font-size:1.02rem}
  .cat-card p{font-size:.84rem;color:#AEBFCC}
  .cat-card:has(.cat-art img)::after{
    background:linear-gradient(to top,rgba(8,15,21,.96) 30%,rgba(8,15,21,.66) 62%,rgba(8,15,21,.45));
  }
  /* hero copy sits on a photo: keep it readable at small sizes */
  .hero p{text-shadow:0 1px 10px rgba(4,10,15,.65)}
  /* product cards: name/specs were down to 13/12px */
  .prod h3{font-size:.92rem}
  .spec{font-size:.8rem}
  /* checklist ticks: 19px next to 15px text read bulky */
  .checks li svg{width:17px;height:17px;margin-top:2px}
  /* footer */
  .foot-contact svg{width:14px;height:14px}
  .social svg{width:17px;height:17px}
  .foot-grid h4{line-height:1.3}
  /* bottom contact bar: icon was 2x the label height */
  .m-bar a{font-size:.72rem}
  .m-bar svg{width:18px;height:18px}
}