/* ============================================================
   HONGTU / phonetoo-en — shared stylesheet
   Clean modern industrial B2B look. No build step.
   EDIT: brand colors live in :root below.
   ============================================================ */
:root{
  --navy:#0e2a47;
  --navy-dark:#081c33;
  --navy-light:#16395f;
  --red:#d8232a;
  --red-dark:#ad1b21;
  --bg:#ffffff;
  --bg-soft:#f4f6f9;
  --text:#1e2c3d;
  --muted:#5d6f84;
  --line:#e3e9f0;
  --radius:10px;
  --shadow:0 6px 24px rgba(14,42,71,.08);
  --maxw:1140px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.65;font-size:16px;
}
img{max-width:100%}
a{color:var(--red);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
section{padding:64px 0}
h1,h2,h3{line-height:1.3;color:var(--navy)}
h1{font-size:2.1rem;margin-bottom:16px}
h2{font-size:1.6rem;margin-bottom:20px}
h3{font-size:1.15rem;margin-bottom:10px}
.section-title{text-align:center;margin-bottom:12px}
.section-sub{text-align:center;color:var(--muted);max-width:720px;margin:0 auto 40px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--line);transition:box-shadow .2s;
}
.site-header.scrolled{box-shadow:0 4px 18px rgba(14,42,71,.12)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:12px;color:var(--navy);flex-shrink:0}
.brand:hover{text-decoration:none}
.brand-mark{
  width:42px;height:42px;border-radius:8px;background:linear-gradient(135deg,var(--red),var(--red-dark));
  color:#fff;font-weight:800;font-size:1.05rem;display:flex;align-items:center;justify-content:center;letter-spacing:1px;
}
.brand-name{font-weight:800;font-size:1.12rem;line-height:1.15}
.brand-tag{display:block;font-size:.68rem;font-weight:500;color:var(--muted);letter-spacing:.4px}
.main-nav{display:flex;gap:4px;margin-left:auto}
.main-nav a{
  color:var(--text);font-weight:600;font-size:.95rem;padding:10px 14px;border-radius:8px;
}
.main-nav a:hover{background:var(--bg-soft);text-decoration:none;color:var(--navy)}
.main-nav a.active{color:var(--red)}
.header-cta{margin-left:8px;flex-shrink:0}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;
  width:44px;height:44px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px;margin-left:auto}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--navy)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;padding:12px 26px;border-radius:8px;font-weight:700;font-size:.98rem;
  border:2px solid transparent;cursor:pointer;transition:all .18s;text-align:center;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--red);color:#fff;border-color:var(--red)}
.btn-primary:hover{background:var(--red-dark);border-color:var(--red-dark);color:#fff}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn-outline:hover{border-color:#fff;color:#fff}
.btn-navy{background:var(--navy);color:#fff;border-color:var(--navy)}
.btn-navy:hover{background:var(--navy-light);color:#fff}
.btn-sm{padding:9px 18px;font-size:.88rem}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(120deg,var(--navy-dark) 0%,var(--navy) 55%,var(--navy-light) 100%);
  color:#fff;padding:88px 0 80px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(216,35,42,.35),transparent 65%);
}
.hero h1{color:#fff;font-size:2.5rem;max-width:640px}
.hero p.lead{color:#c9d6e4;font-size:1.12rem;max-width:620px;margin:14px 0 30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.trust-chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:34px}
.chip{
  font-size:.82rem;font-weight:600;color:#dbe5f0;border:1px solid rgba(255,255,255,.28);
  padding:7px 14px;border-radius:999px;background:rgba(255,255,255,.06);
}
.chip strong{color:#fff}

/* ---------- Cards / grids ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:22px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow);display:flex;flex-direction:column;
  transition:transform .18s,box-shadow .18s;
}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(14,42,71,.13)}
.card h3{margin-bottom:8px}
.card h3 a{color:var(--navy)}
.card h3 a:hover{color:var(--red);text-decoration:none}
.card p{color:var(--muted);font-size:.94rem;flex:1}
.card .card-link{margin-top:14px;font-weight:700;font-size:.92rem}
.card-icon{
  width:46px;height:46px;border-radius:10px;background:var(--bg-soft);color:var(--red);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.card-icon svg{width:24px;height:24px}
.bg-soft{background:var(--bg-soft)}

/* ---------- Value props ---------- */
.props{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.prop{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow)}
.prop h3{margin:14px 0 8px}
.prop p{color:var(--muted);font-size:.95rem}

/* ---------- Product page ---------- */
.breadcrumb{font-size:.86rem;color:var(--muted);margin:26px 0 6px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--red)}
.product-layout{display:grid;grid-template-columns:1fr 350px;gap:36px;margin:10px 0 70px;align-items:start}
.product-main h1{margin-bottom:6px}
.product-kicker{color:var(--red);font-weight:700;font-size:.85rem;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:8px}
.auth-note{
  display:flex;gap:12px;align-items:flex-start;background:#fff7f7;border:1px solid #f3c1c4;
  border-radius:var(--radius);padding:14px 16px;margin:20px 0;font-size:.92rem;
}
.auth-note .badge-auth{flex-shrink:0}
.badge-auth{
  display:inline-block;background:var(--red);color:#fff;font-size:.75rem;font-weight:800;
  letter-spacing:.6px;padding:5px 12px;border-radius:999px;text-transform:uppercase;white-space:nowrap;
}
.product-main p{margin-bottom:14px}
.product-main ul.features{margin:0 0 18px 20px}
.product-main ul.features li{margin-bottom:8px}
.spec-table{width:100%;border-collapse:collapse;margin:18px 0 26px;font-size:.93rem}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
.spec-table th{background:var(--navy);color:#fff;font-weight:700}
.spec-table tr:nth-child(even) td{background:var(--bg-soft)}
.spec-note{background:var(--bg-soft);border-left:4px solid var(--red);padding:14px 18px;border-radius:0 8px 8px 0;margin:18px 0;font-size:.94rem}
.price-table td:last-child,.price-table th:last-child{white-space:nowrap}
.price-table tr.price-group td{background:var(--navy);color:#fff;font-size:.95rem}
.rfq-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;position:sticky;top:96px;
}
.rfq-card h3{margin-bottom:4px}
.rfq-card .rfq-sub{font-size:.88rem;color:var(--muted);margin-bottom:18px}
.ship-note{font-size:.85rem;color:var(--muted);margin-top:14px;border-top:1px solid var(--line);padding-top:14px}

/* ---------- Forms ---------- */
.form-group{margin-bottom:14px}
.form-group label{display:block;font-weight:700;font-size:.86rem;margin-bottom:6px;color:var(--navy)}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font-size:.95rem;
  font-family:inherit;background:#fff;color:var(--text);
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(216,35,42,.12);
}
.form-group textarea{min-height:110px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-note{font-size:.8rem;color:var(--muted);margin-top:10px}

/* ---------- Contact / about ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin:26px 0 70px;align-items:start}
.contact-card{background:var(--bg-soft);border-radius:var(--radius);padding:28px}
.contact-card h3{margin-bottom:14px}
.contact-line{display:flex;gap:12px;margin-bottom:14px;font-size:.96rem}
.contact-line strong{color:var(--navy);min-width:74px}
.map-placeholder{
  border:2px dashed var(--line);border-radius:var(--radius);background:var(--bg-soft);
  min-height:220px;display:flex;align-items:center;justify-content:center;text-align:center;
  color:var(--muted);font-size:.9rem;padding:24px;margin-top:18px;
}
.cert-placeholder{
  border:2px dashed #f0a3a7;border-radius:var(--radius);background:#fff7f7;
  padding:34px 26px;text-align:center;color:#8a4b4e;margin:22px 0;
}
.cert-placeholder strong{display:block;color:var(--red);margin-bottom:6px}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-dark);color:#b9c7d8;padding:56px 0 0;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:16px}
.site-footer a{color:#b9c7d8;font-size:.92rem}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:9px}
.footer-brand p{font-size:.9rem;margin-top:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;font-size:.82rem;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#8fa0b5}

/* ---------- About split (homepage) ---------- */
.about-split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}

/* ---------- Related ---------- */
.related{margin:10px 0 70px}
.related .card-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .product-layout{grid-template-columns:1fr}
  .about-split{grid-template-columns:1fr}
  .rfq-card{position:static}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  section{padding:46px 0}
  .hero{padding:64px 0 56px}
  .hero h1{font-size:1.9rem}
  .main-nav{
    display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;
    padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(14,42,71,.12);
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 8px;border-bottom:1px solid var(--bg-soft)}
  .nav-toggle{display:flex}
  .header-cta{display:none}
  .header-cta.mobile-show{display:inline-block;margin:10px 8px 4px}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  h1{font-size:1.7rem}
}

/* Datasheet downloads */
.dl-box{border:1px solid var(--line,#e2e5ea);border-radius:10px;padding:18px 20px;margin:28px 0;background:#f8fafc}
.dl-box h2{margin:0 0 10px;font-size:1.05rem}
.dl-box ul{list-style:none;margin:0;padding:0}
.dl-box li{margin:8px 0}
.dl-box a{font-weight:600}
.dl-size{font-weight:400;color:var(--muted,#667);font-size:.85em}
ul.dl-list{list-style:none;margin:0 0 30px;padding:0}
ul.dl-list li{margin:9px 0}
ul.dl-list a{font-weight:600}

/* Product photos */
.product-photo{margin:6px 0 22px;max-width:560px}
.product-photo img{width:100%;height:auto;border-radius:10px;border:1px solid var(--line,#e2e5ea);display:block}
.product-photo figcaption{font-size:.85rem;color:var(--muted,#667);margin-top:8px;line-height:1.5}

/* FAQ section (AI-friendly Q&A) */
.faq{margin:30px 0}
.faq-item{border:1px solid var(--line,#e2e5ea);border-radius:10px;padding:16px 18px;margin:0 0 12px;background:#fff}
.faq-item h3{font-size:1.12rem;margin:0 0 8px}
.faq-item p{margin:0;line-height:1.7;font-size:17px}

/* language switcher in header */
.main-nav a.lang-switch { border: 1px solid #d7dde3; border-radius: 4px; padding: 4px 10px; font-size: 13px; }
.main-nav a.lang-switch:hover { background: #f2f5f7; }