:root{
  --primary:#F59E0B; --primary-dark:#B45309; --primary-light:#FEF3C7; --primary-mid:#FCD34D;
  --accent:#0EA5E9; --dark:#0F172A; --gray-900:#111827; --gray-800:#1F2937; --gray-700:#374151;
  --gray-600:#4B5563; --gray-500:#6B7280; --gray-400:#9CA3AF; --gray-300:#D1D5DB;
  --gray-200:#E5E7EB; --gray-100:#F3F4F6; --gray-50:#F9FAFB; --white:#fff;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --shadow-sm:0 1px 3px rgba(0,0,0,.07); --shadow-md:0 4px 16px rgba(0,0,0,.09);
  --shadow-lg:0 8px 32px rgba(0,0,0,.11); --radius-sm:8px; --radius-md:12px;
  --radius-lg:20px; --radius-xl:28px; --max-w:1200px; --transition:.25s ease;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--gray-900);background:var(--white);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.2;font-weight:800;letter-spacing:-.02em}

/* ---------- header ---------- */
.header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--gray-200)}
.header-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px}
.logo-mark{width:38px;height:38px;border-radius:10px;display:block;flex:none}
.brand-plate{margin:18px 0 6px}
.brand-plate img{max-width:100%;height:auto}
.logo-icon{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--dark),var(--gray-700));color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;letter-spacing:.5px}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-brand{font-weight:800;font-size:17px;letter-spacing:-.01em}
.logo-tagline{font-size:11px;color:var(--gray-500)}
.nav{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.nav-link{padding:7px 10px;border-radius:var(--radius-sm);font-size:13.5px;font-weight:500;color:var(--gray-700);transition:var(--transition)}
.nav-link:hover{background:var(--gray-100);color:var(--gray-900)}
.nav-link.active{background:var(--primary-light);color:var(--primary-dark)}
.nav-btn{padding:9px 16px;border-radius:var(--radius-sm);background:var(--dark);color:#fff;font-size:13.5px;font-weight:600;transition:var(--transition)}
.nav-btn:hover{background:var(--primary);color:var(--dark)}
.nav-toggle{display:none;flex-direction:column;gap:4px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--gray-800);display:block}

/* ---------- trust bar ---------- */
.trust-bar{background:var(--dark);color:#fff;overflow-x:auto}
.trust-inner{max-width:var(--max-w);margin:0 auto;display:flex;gap:26px;padding:9px 20px;font-size:12.5px;white-space:nowrap}
.trust-item{display:flex;align-items:center;gap:6px;color:rgba(255,255,255,.82)}
.trust-item strong{color:var(--primary-mid)}
.trust-icon{font-size:14px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;min-height:520px;display:flex;align-items:center;
  background:radial-gradient(1200px 500px at 15% -10%,#1E293B 0%,var(--dark) 55%);
  color:#fff;padding:76px 20px 60px}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg picture{display:block;width:100%;height:100%}
.hero-bg img{width:100%;height:100%;object-fit:cover;object-position:right center}
.hero::before{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(90deg,rgba(8,10,15,.96) 0%,rgba(8,10,15,.9) 28%,rgba(8,10,15,.42) 58%,rgba(8,10,15,.06) 100%)}
.hero-inner{max-width:var(--max-w);margin:0 auto;position:relative;z-index:2;width:100%}
.hero-title{font-size:clamp(34px,5.4vw,60px);margin:18px 0 16px}
.hero-accent{color:var(--primary)}
.hero-sub{max-width:720px;color:rgba(255,255,255,.78);font-size:16.5px}
.hero-cta{display:flex;gap:12px;margin:26px 0 34px;flex-wrap:wrap}
.hero-stats{display:flex;gap:38px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.14);padding-top:22px}
.hero-stat{display:flex;flex-direction:column}
.hero-stat strong{font-size:26px;color:var(--primary-mid);font-weight:800}
.hero-stat span{font-size:12.5px;color:rgba(255,255,255,.62);text-transform:uppercase;letter-spacing:.06em}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:12px 22px;border-radius:var(--radius-sm);font-weight:600;font-size:14.5px;
  transition:var(--transition);border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--primary);color:var(--dark)}
.btn-primary:hover{background:var(--primary-mid);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-outline{border-color:rgba(255,255,255,.35);color:#fff}
.btn-outline:hover{background:rgba(255,255,255,.1)}
.btn-sm{padding:8px 14px;font-size:13px}
.btn-full{width:100%;text-align:center}

/* ---------- layout ---------- */
.section-inner{max-width:var(--max-w);margin:0 auto;padding:56px 20px}
.page-narrow{max-width:900px}
.section-head{margin-bottom:30px}
.section-title{font-size:clamp(24px,3vw,34px)}
.section-sub{color:var(--gray-600);margin-top:10px;max-width:760px}
.crumb{font-size:13px;color:var(--gray-500);margin-bottom:14px}
.crumb a:hover{color:var(--primary-dark)}
.page-title{font-size:clamp(28px,4vw,42px);margin-bottom:14px}
.page-lead{color:var(--gray-600);font-size:16.5px;max-width:820px}

/* ---------- cert bar ---------- */
.cert-bar{background:var(--gray-50);border-block:1px solid var(--gray-200)}
.cert-bar-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:16px 20px}
.cert-badge{background:#fff;border:1px solid var(--gray-300);border-radius:999px;padding:5px 14px;font-size:12.5px;font-weight:600;color:var(--gray-700)}
.cert-moqs{font-size:12.5px;color:var(--gray-500);text-transform:uppercase;letter-spacing:.06em}

/* ---------- series grid (home) ---------- */
.series-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.series-card{border:1px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;background:#fff;
  transition:var(--transition);display:flex;flex-direction:column}
.series-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--primary-mid)}
.series-card-img{aspect-ratio:16/9;overflow:hidden;background:var(--gray-100)}
.series-card-img img{width:100%;height:100%;object-fit:cover}
.series-card-body{padding:18px 20px 22px}
.series-card-body h3{font-size:18px;margin:8px 0}
.series-card-body p{font-size:13.5px;color:var(--gray-600)}
.series-card-meta{margin-top:12px;font-size:12.5px;color:var(--gray-500)}
.series-card-meta strong{color:var(--gray-800)}
.series-badge{display:inline-block;background:var(--primary-light);color:var(--primary-dark);border-radius:999px;
  padding:4px 12px;font-size:11.5px;font-weight:700;text-transform:uppercase;letter-spacing:.07em}

/* ---------- series hero ---------- */
.series-hero{display:grid;grid-template-columns:1.15fr .85fr;gap:0;background:var(--dark);color:#fff;align-items:center}
.series-hero-inner{padding:52px 20px 52px max(20px,calc((100vw - var(--max-w))/2))}
.series-hero .crumb{color:rgba(255,255,255,.55)}
.series-hero .crumb a:hover{color:var(--primary-mid)}
.series-hero .series-sub{color:var(--primary-mid);font-weight:600;margin:14px 0 10px}
.series-hero .series-desc{color:rgba(255,255,255,.75);max-width:640px;margin-bottom:22px}
.series-hero-img{height:100%;min-height:320px;overflow:hidden}
.series-hero-img img{width:100%;height:100%;object-fit:cover;opacity:.92}

/* ---------- filter bar ---------- */
.filter-bar{position:sticky;top:63px;z-index:50;background:var(--gray-50);border-bottom:1px solid var(--gray-200)}
.filter-bar-inner{max-width:var(--max-w);margin:0 auto;display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:12px 20px}
.filter-search,.filter-select{padding:8px 12px;border:1px solid var(--gray-300);border-radius:var(--radius-sm);
  font-size:13.5px;font-family:var(--font);background:#fff;color:var(--gray-800)}
.filter-search{flex:1;min-width:200px}
.filter-count{font-size:12.5px;color:var(--gray-500);margin-left:auto}

/* ---------- product rows ---------- */
.product-grid{display:flex;flex-direction:column;gap:0}
.product-row{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start;padding:38px 0;border-top:1px solid var(--gray-200)}
.product-row:first-child{border-top:0}
.product-row-rev .product-row-info{order:2}
.product-img-wrap{border-radius:var(--radius-lg);overflow:hidden;background:var(--gray-100);
  aspect-ratio:3/2;display:flex;align-items:center;justify-content:center}
.product-img-wrap img{width:100%;height:100%;object-fit:contain}
.gallery-main{cursor:zoom-in}
.product-power-lg{font-size:34px;font-weight:800;color:var(--primary-dark);margin:16px 0 2px;letter-spacing:-.03em}
.product-name-lg{font-size:22px;margin-bottom:8px}
.product-desc-lg{color:var(--gray-600);font-size:14px}
.product-feat-lg{color:var(--gray-500);font-size:13px;margin-top:6px}
.product-models{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.model-chip{border-radius:999px;padding:5px 12px;font-size:12px;font-weight:600;border:1px solid var(--gray-300);color:var(--gray-700);background:#fff}
.chip-cap{background:var(--primary-light);border-color:var(--primary-mid);color:var(--primary-dark)}
.chip-power{background:var(--dark);border-color:var(--dark);color:#fff}
.chip-color{background:var(--gray-100)}

/* ---------- spec card ---------- */
.spec-card{border:1px solid var(--gray-200);border-radius:var(--radius-md);background:var(--gray-50);padding:18px 20px}
.spec-header{display:flex;justify-content:space-between;align-items:baseline;gap:12px;border-bottom:1px solid var(--gray-200);padding-bottom:10px;margin-bottom:12px}
.spec-model{font-weight:800;font-size:17px}
.spec-cap{font-size:13.5px;color:var(--gray-600);font-weight:600}
.spec-output{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.spec-line{font-size:13px;color:var(--gray-700);background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-sm);padding:7px 10px}
.spec-line strong{color:var(--gray-900)}
.spec-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:12px}
.spec-cell{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-sm);padding:8px 10px;display:flex;flex-direction:column}
.spec-k{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--gray-500)}
.spec-v{font-size:13px;font-weight:600}
.spec-cert{font-size:11.5px;color:var(--gray-500)}

/* ---------- oem grid ---------- */
.oem-section{background:var(--gray-50);border-block:1px solid var(--gray-200)}
.oem-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.oem-card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-md);padding:20px}
.oem-icon{font-size:22px;margin-bottom:8px}
.oem-card h3{font-size:16px;margin-bottom:6px}
.oem-card p{font-size:13.5px;color:var(--gray-600)}

/* ---------- faq / quote / contact ---------- */
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{border:1px solid var(--gray-200);border-radius:var(--radius-md);padding:14px 18px;background:#fff}
.faq-item summary{font-weight:600;cursor:pointer;font-size:15px}
.faq-item p{color:var(--gray-600);font-size:14px;margin-top:10px}
.quote-section{background:var(--dark);color:#fff;padding:56px 20px}
.quote-inner{max-width:760px;margin:0 auto;text-align:center}
.quote-title{font-size:clamp(24px,3.4vw,34px);margin:14px 0 12px}
.quote-desc{color:rgba(255,255,255,.75);margin-bottom:24px}
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:26px;margin-top:28px}
.contact-card{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--radius-md);padding:22px}
.contact-card h3{margin-bottom:14px}
.contact-card p{font-size:14px;color:var(--gray-600);margin-bottom:12px}
.contact-card strong{color:var(--gray-900);font-size:12.5px;text-transform:uppercase;letter-spacing:.05em}
.quote-form{display:flex;flex-direction:column;gap:12px}
.form-row{display:flex;flex-direction:column;gap:5px}
.form-row label{font-size:12.5px;font-weight:600;color:var(--gray-700)}
.form-row input,.form-row select,.form-row textarea{padding:10px 12px;border:1px solid var(--gray-300);
  border-radius:var(--radius-sm);font-size:14px;font-family:var(--font);background:#fff}
.form-row input:focus,.form-row textarea:focus{outline:2px solid var(--primary-mid);border-color:var(--primary)}
.form-note{font-size:12px;color:var(--gray-500)}

/* ---------- tables / steps ---------- */
.facts-table{margin-top:34px}
.facts-table h3{margin-bottom:12px}
.facts-table table{width:100%;border-collapse:collapse;font-size:14px}
.facts-table th,.facts-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--gray-200)}
.facts-table th{width:38%;color:var(--gray-600);font-weight:600;background:var(--gray-50)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:26px}
.about-card{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--radius-md);padding:20px}
.about-card h3{font-size:16px;margin-bottom:8px}
.about-card p{font-size:13.5px;color:var(--gray-600)}
.steps{margin-top:32px}
.steps h3{margin-bottom:12px}
.steps ol{margin-left:18px;color:var(--gray-700);font-size:14.5px}
.steps li{margin-bottom:10px}

/* ---------- footer ---------- */
.footer{background:var(--gray-900);color:rgba(255,255,255,.75);padding:44px 20px 0}
.footer-inner{max-width:var(--max-w);margin:0 auto;display:grid;grid-template-columns:1.3fr 2fr;gap:34px}
.footer .logo-brand,.footer .logo-icon{color:#fff}

.footer .logo-tagline{color:rgba(255,255,255,.5)}
.footer-desc{font-size:13px;margin-top:14px;max-width:380px;color:rgba(255,255,255,.6)}
.footer-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:22px}
.footer-col{display:flex;flex-direction:column;gap:7px}
.footer-col h4{font-size:12.5px;text-transform:uppercase;letter-spacing:.07em;color:#fff;margin-bottom:3px}
.footer-col a,.footer-col span{font-size:13px;color:rgba(255,255,255,.66)}
.footer-col a:hover{color:var(--primary-mid)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding:16px 0;font-size:12.5px;text-align:center}
.footer-bottom a{color:var(--primary-mid)}

/* ---------- company stats band ---------- */
.company-band{background:#fff}
.stats-band{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin:26px 0 8px}
.stats-band-item{background:var(--dark);color:#fff;border-radius:var(--radius-md);padding:18px 16px;text-align:center}
.stats-band-item strong{display:block;font-size:26px;font-weight:800;color:var(--primary-mid);letter-spacing:-.02em}
.stats-band-item span{font-size:11.5px;text-transform:uppercase;letter-spacing:.06em;color:rgba(255,255,255,.7)}
.profile{margin-top:22px;display:flex;flex-direction:column;gap:14px}
.profile p{color:var(--gray-700);font-size:15.5px}
.page-narrow .stats-band{margin-top:26px}

/* ---------- floating WhatsApp ---------- */
.wa-float{position:fixed;right:18px;bottom:18px;z-index:120;display:flex;align-items:center;gap:8px;
  background:#25D366;color:#fff;font-weight:700;font-size:13.5px;border-radius:999px;padding:12px 18px;
  box-shadow:0 6px 20px rgba(37,211,102,.38);transition:var(--transition)}
.wa-float:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(37,211,102,.5)}
.wa-float span{display:inline}
@media (max-width:600px){.wa-float span{display:none}.wa-float{padding:14px;font-size:20px}}

/* ---------- picture elements ---------- */
.product-img-wrap picture,.series-card-img picture{display:flex;align-items:center;justify-content:center;width:100%;height:100%}
.series-hero-img picture{display:block;width:100%;height:100%}
.product-top-img picture{display:block;width:100%}

/* ---------- product detail pages ---------- */
.page-wide{max-width:1200px}
.product-top{display:grid;grid-template-columns:1.05fr 1fr;gap:34px;align-items:start;margin-top:18px}
.product-top-img{border-radius:var(--radius-lg);overflow:hidden;background:var(--gray-100);
  display:flex;align-items:center;justify-content:center}
.product-top-img img{width:100%;height:auto;object-fit:contain}
.product-top-info .product-models{margin-top:10px}
.product-top-info .page-lead{margin:14px 0 18px}
.btn-outline-dark{border-color:var(--gray-400);color:var(--gray-800)}
.btn-outline-dark:hover{background:var(--gray-100)}
.facts-table.mini{margin-top:20px}
.facts-table.mini th{width:42%;font-size:13px;text-transform:none;letter-spacing:0}
.facts-table.mini td{font-size:13.5px;font-weight:600}
.spec-card.wide{max-width:100%}
.spec-more{display:inline-block;margin-top:12px;font-size:13px;font-weight:600;color:var(--primary-dark)}
.spec-more:hover{text-decoration:underline}
.seo-lead{color:rgba(255,255,255,.72);font-size:14.5px;margin:-6px 0 18px;max-width:760px}
.page-narrow .seo-lead,.section-inner .seo-lead{color:var(--gray-600)}
.quote-inline{background:var(--gray-50);border:1px solid var(--gray-200);border-left:4px solid var(--primary);
  border-radius:var(--radius-sm);padding:14px 18px;margin:26px 0;font-size:14.5px;color:var(--gray-800)}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-top:16px}
.rel-card{border:1px solid var(--gray-200);border-radius:var(--radius-md);overflow:hidden;background:#fff;
  padding-bottom:12px;transition:var(--transition);display:flex;flex-direction:column;align-items:center}
.rel-card:hover{border-color:var(--primary-mid);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.rel-card picture{display:flex;align-items:center;justify-content:center;width:100%;aspect-ratio:3/2;background:var(--gray-100)}
.rel-card img{width:100%;height:100%;object-fit:contain}
.rel-model{font-weight:700;font-size:14px;margin-top:10px}
.rel-cap{font-size:12.5px;color:var(--gray-500)}
h2.section-title{margin:34px 0 14px}

/* ---------- certification wall ---------- */
.cert-wall{margin:6px 0 26px}
.cert-wall picture{display:block}
.cert-wall img{width:100%;height:auto;border-radius:var(--radius-md);border:1px solid var(--gray-200);
  background:var(--gray-50)}
.cert-wall figcaption{font-size:12.5px;color:var(--gray-500);line-height:1.65;margin-top:10px;max-width:900px}

/* ---------- customization / guide components ---------- */
.stats-note{font-size:12.5px;margin-top:12px;opacity:.72;text-align:center;line-height:1.55}
.cn{display:block;font-size:11.5px;color:var(--gray-400);font-weight:500;letter-spacing:0;margin-top:2px}
.cell-note{display:block;font-size:12.5px;color:var(--gray-500);margin-top:6px;font-weight:500;line-height:1.6}
.flow-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:14px;margin-top:16px}
.flow-step{border:1px solid var(--gray-200);border-radius:var(--radius-md);padding:16px 18px;background:#fff}
.flow-num{font-size:12px;font-weight:800;color:var(--primary);letter-spacing:.1em}
.flow-step h3{font-size:15px;margin:6px 0}
.flow-step p{font-size:13.5px;color:var(--gray-600);line-height:1.55;margin:0}
.faq-list{margin-top:16px}
.faq-item{border:1px solid var(--gray-200);border-radius:var(--radius-sm);padding:14px 18px;
  margin-bottom:10px;background:#fff}
.faq-item summary{font-weight:600;cursor:pointer;font-size:15px;color:var(--gray-900)}
.faq-a{font-size:14px;color:var(--gray-600);line-height:1.68;margin-top:10px}
.facts-table th .cn{font-weight:500}
.facts-table td{line-height:1.6}

@media (max-width:860px){
  .hero{min-height:0;padding:56px 20px 44px}
  .hero-bg img{object-position:78% center}
  .hero::before{background:linear-gradient(180deg,rgba(8,10,15,.97) 0%,rgba(8,10,15,.93) 45%,rgba(8,10,15,.72) 100%)}
  .hero-stats{gap:22px}
}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .product-top{grid-template-columns:1fr}
  .series-hero{grid-template-columns:1fr}
  .series-hero-img{min-height:220px;max-height:280px}
  .product-row{grid-template-columns:1fr;gap:20px}
  .product-row-rev .product-row-info{order:0}
  .contact-grid,.about-grid,.footer-inner{grid-template-columns:1fr}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;padding:10px 16px 18px;border-bottom:1px solid var(--gray-200);box-shadow:var(--shadow-md)}
  .nav.open{display:flex}
  .nav-toggle{display:flex}
  .header{position:sticky}
  .filter-bar{top:0}
  .spec-grid{grid-template-columns:1fr}
}