/* Senger (Shandong) Global Trading Co., Ltd. — site stylesheet */
:root{
  --ink:#0e1b26; --ink2:#3c4f5e; --muted:#6e8191;
  --line:#e2e8ee; --line2:#eef3f7; --bg:#ffffff; --soft:#f5f8fa;
  --brand:#0f4c81; --brand2:#1c74b8; --brand3:#0a375f;
  --accent:#c8102e;
  --shadow:0 1px 2px rgba(14,27,38,.05), 0 8px 24px rgba(14,27,38,.06);
  --shadow-lg:0 2px 6px rgba(14,27,38,.06), 0 18px 44px rgba(14,27,38,.10);
  --radius:12px;
  --wrap:1140px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink); line-height:1.68;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:820px;margin-left:auto;margin-right:auto}
h1,h2,h3,h4{letter-spacing:-.015em;line-height:1.28;margin:0}
h2{font-size:clamp(23px,2.5vw,29px)}
h3{font-size:17px}
p{margin:0}

/* ---------- header ---------- */
header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);transition:box-shadow .2s ease;
}
header.scrolled{box-shadow:0 1px 12px rgba(14,27,38,.07)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;gap:20px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:17px;letter-spacing:.03em;color:var(--ink);text-decoration:none}
.logo:hover{text-decoration:none}
.logo .mark{
  width:32px;height:32px;flex:0 0 32px;border-radius:7px;display:grid;place-items:center;
  background:linear-gradient(150deg,var(--brand2),var(--brand3));color:#fff;font-weight:800;font-size:15px;
}
.logo .name{line-height:1.15}
.logo .name small{display:block;font-size:10.5px;font-weight:500;color:var(--muted);letter-spacing:.10em;text-transform:uppercase}
.nav-links{display:flex;gap:24px;font-size:14.5px;color:var(--ink2)}
.nav-links a{color:var(--ink2)}
.nav-links a:hover{color:var(--brand)}
.nav-right{display:flex;align-items:center;gap:12px}
.lang{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.lang a{padding:6px 11px;font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.04em}
.lang a:hover{background:var(--line2);text-decoration:none}
.lang a.on{background:var(--brand);color:#fff}
.burger{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;width:40px;height:38px;cursor:pointer;align-items:center;justify-content:center}
.burger span{display:block;width:16px;height:1.8px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:1.8px;background:var(--ink)}
.burger span::before{top:-5px}.burger span::after{top:5px}
#mnav{display:none;border-top:1px solid var(--line);background:#fff}
#mnav a{display:block;padding:13px 24px;border-bottom:1px solid var(--line2);font-size:15px;color:var(--ink2)}
#mnav.open{display:block}

/* ---------- hero ---------- */
.hero{
  position:relative;color:#fff;overflow:hidden;
  background:linear-gradient(155deg,#0f4c81 0%,#123f66 48%,#08243c 100%);
  padding:88px 0 78px;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(ellipse at 70% 20%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 70% 20%,#000 0%,transparent 78%);
}
.hero .wrap{position:relative;z-index:2}
.hero .eyebrow{font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:#8fb6d6;font-weight:600;margin-bottom:18px}
.hero h1{font-size:clamp(29px,4vw,46px);max-width:22em;margin-bottom:18px;color:#fff}
.hero p.lead{font-size:clamp(15px,1.4vw,17px);color:#c9dcec;max-width:52em;margin-bottom:26px}
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:30px}
.chip{
  background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.2);
  padding:5px 13px;border-radius:20px;font-size:12.8px;color:#e3eefa;backdrop-filter:blur(2px);
}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--brand);
  padding:13px 24px;border-radius:9px;font-weight:650;font-size:15px;border:1px solid #fff;
  transition:transform .15s ease,box-shadow .15s ease;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(0,0,0,.22);text-decoration:none}
.btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.42)}
.btn.ghost:hover{background:rgba(255,255,255,.08)}
.btn.wa{background:#25d366;border-color:#25d366;color:#08301a}
.btn.solid{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.solid:hover{background:var(--brand3);border-color:var(--brand3)}

/* ---------- trust bar ---------- */
.trustbar{background:#fff;border-bottom:1px solid var(--line)}
.trustbar ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr)}
.trustbar li{padding:22px 8px;border-right:1px solid var(--line2);text-align:center}
.trustbar li:last-child{border-right:0}
.trustbar b{display:block;font-size:15px;color:var(--brand);margin-bottom:2px}
.trustbar span{font-size:12.8px;color:var(--muted)}

/* ---------- sections ---------- */
section{padding:66px 0}
section.alt{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{margin-bottom:30px;max-width:60em}
.sec-head .kicker{font-size:12px;letter-spacing:.15em;text-transform:uppercase;color:var(--brand2);font-weight:700;margin-bottom:10px}
.sec-head .sub{color:var(--ink2);font-size:15.5px;margin-top:12px}
.grid{display:grid;gap:18px}
.grid.g3{grid-template-columns:repeat(auto-fit,minmax(272px,1fr))}
.grid.g2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:#d3dfe9}
.card .ico{width:38px;height:38px;color:var(--brand);margin-bottom:14px}
.card h3{margin-bottom:9px;color:var(--ink)}
.card ul{margin:0;padding-left:17px;font-size:14.3px;color:var(--ink2)}
.card li{margin-bottom:5px}
.card li::marker{color:#b8c8d6}
.card p{font-size:14.6px;color:var(--ink2)}
.card.photo{padding:0;overflow:hidden;display:flex;flex-direction:column}
.card.photo .ph{aspect-ratio:3/2;overflow:hidden;background:#dbe4ec}
.card.photo .ph img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.card.photo:hover .ph img{transform:scale(1.04)}
.card.photo .bd{padding:20px 22px 22px;flex:1}
.card.photo h3{margin-bottom:9px}
.card.photo ul{margin:0;padding-left:17px;font-size:14.3px;color:var(--ink2)}
.card.photo li{margin-bottom:5px}
.card.photo li::marker{color:#b8c8d6}

/* ---------- table ---------- */
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;font-size:14.4px;min-width:560px}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line2);vertical-align:top}
tbody tr:last-child td{border-bottom:0}
th{background:#eef4f8;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink2);font-weight:700}
td:first-child{color:var(--brand);font-weight:600;white-space:nowrap}
tbody tr:hover{background:#fafcfd}

/* ---------- steps ---------- */
.steps{counter-reset:s;display:grid;gap:0}
.step{display:grid;grid-template-columns:44px 1fr;gap:18px;padding:22px 0;border-bottom:1px dashed var(--line)}
.step:last-child{border-bottom:0}
.step .num{
  counter-increment:s;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;
  background:#eaf2f9;color:var(--brand);font-weight:700;font-size:15px;
}
.step .num::before{content:counter(s,decimal-leading-zero)}
.step h3{margin-bottom:5px}
.step p{font-size:14.6px;color:var(--ink2)}

/* ---------- faq ---------- */
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin-bottom:10px;overflow:hidden}
.faq summary{
  cursor:pointer;padding:17px 20px;font-weight:600;font-size:15.3px;list-style:none;
  display:flex;justify-content:space-between;gap:16px;align-items:center;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand2);font-size:20px;font-weight:400;line-height:1}
.faq details[open] summary::after{content:"\2013"}
.faq details[open] summary{border-bottom:1px solid var(--line2)}
.faq .ans{padding:16px 20px 20px;font-size:14.6px;color:var(--ink2)}

/* ---------- note ---------- */
.note{
  border-left:3px solid var(--brand2);background:#f2f8fc;border-radius:0 10px 10px 0;
  padding:18px 22px;font-size:14.6px;color:var(--ink2);
}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:start}
.kv{display:grid;grid-template-columns:104px 1fr;gap:12px;font-size:15px;padding:11px 0;border-bottom:1px solid var(--line2)}
.kv:last-of-type{border-bottom:0}
.kv b{color:var(--muted);font-weight:500;font-size:13.4px;text-transform:uppercase;letter-spacing:.05em;padding-top:2px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.field{margin-bottom:13px}
.field label{display:block;font-size:12.6px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font:inherit;font-size:14.5px;
  color:var(--ink);background:#fff;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:2px solid #cfe3f4;border-color:var(--brand2)}
.field textarea{min-height:98px;resize:vertical}
.formnote{font-size:12.6px;color:var(--muted);margin-top:10px}

/* ---------- footer ---------- */
footer{background:#0a2439;color:#93afc4;font-size:13.4px;padding:44px 0 34px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:28px}
footer h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.09em;margin-bottom:12px}
footer a{color:#a9c3d6}
footer ul{list-style:none;margin:0;padding:0}
footer li{margin-bottom:7px}
footer .bottom{border-top:1px solid rgba(255,255,255,.11);padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.6px;color:#7b99b0}
footer .bottom p{margin:0}

/* ---------- misc ---------- */
.center{text-align:center}
.mt24{margin-top:24px}
.small{font-size:13px;color:var(--muted)}

@media(max-width:900px){
  .contact-grid,.grid.g2{grid-template-columns:1fr}
  footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav-links{display:none}
  .burger{display:flex}
  section{padding:48px 0}
  .hero{padding:60px 0 56px}
  .trustbar ul{grid-template-columns:1fr 1fr}
  .trustbar li:nth-child(2){border-right:0}
  .trustbar li:nth-child(1),.trustbar li:nth-child(2){border-bottom:1px solid var(--line2)}
  .btn{width:100%;justify-content:center}
  .btns{gap:10px}
  .kv{grid-template-columns:1fr;gap:3px}
  table{min-width:0;font-size:13.6px}
  th,td{padding:11px 13px}
  footer .cols{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* ---------- subpages: breadcrumb ---------- */
.crumb{font-size:13px;color:var(--muted);padding:14px 0 0}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--brand)}
.crumb span.sep{margin:0 7px;color:#c3d2de}

/* ---------- product / category hero ---------- */
.phero{padding:34px 0 8px}
.phero h1{font-size:clamp(24px,3vw,34px);margin-bottom:12px}
.phero .ov{font-size:16.5px;color:var(--ink2);max-width:52em;margin-bottom:16px}
.phero .grades{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.phero .grades b{color:var(--ink2);font-weight:600}
.pimg{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);margin:22px 0 8px}
.pimg img{width:100%;aspect-ratio:3/2;object-fit:cover;display:block}

/* ---------- key facts table ---------- */
.kvtable{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.kvtable th,.kvtable td{text-align:left;padding:13px 18px;border-bottom:1px solid var(--line2);vertical-align:top}
.kvtable tr:last-child th,.kvtable tr:last-child td{border-bottom:0}
.kvtable th{width:180px;background:#eef4f8;font-size:12.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink2);font-weight:700}
.kvtable td{color:var(--ink2)}

/* ---------- tags ---------- */
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{border:1px solid var(--line);background:#fff;border-radius:20px;padding:4px 13px;font-size:12.6px;color:var(--brand);font-weight:600}

/* ---------- apps list ---------- */
.apps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px}
.apps li{list-style:none;background:var(--soft);border:1px solid var(--line);border-radius:9px;padding:11px 15px;font-size:14px;color:var(--ink2)}
.apps ul{margin:0;padding:0}

/* ---------- article ---------- */
.article{max-width:760px;margin:0 auto;font-size:15.5px;color:var(--ink2)}
.article p{margin:0 0 16px}
.article h3{margin:30px 0 10px;color:var(--ink);font-size:18.5px}
.article ul{margin:0 0 16px;padding-left:20px}
.article li{margin-bottom:6px}
.article .meta{font-size:13px;color:var(--muted);margin-bottom:26px}

/* ---------- product list card link ---------- */
a.card{text-decoration:none;color:inherit;display:block}
a.card:hover{text-decoration:none}

/* ---------- knowledge index ---------- */
.klist .card{margin-bottom:14px}
.klist h3{margin-bottom:6px}
.klist .meta{font-size:12.6px;color:var(--muted)}

/* ---------- cta band ---------- */
.ctaband{background:linear-gradient(155deg,#0f4c81,#0a375f);border-radius:var(--radius);color:#fff;padding:34px 38px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin:40px 0}
.ctaband h3{color:#fff;margin-bottom:4px}
.ctaband p{color:#c9dcec;font-size:14.5px}

/* ---------- grade links (category / product pages) ---------- */
.gradelinks{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px;margin-bottom:8px}
.glink{display:block;border:1px solid var(--line);background:#fff;border-radius:10px;padding:12px 15px;text-decoration:none}
.glink:hover{border-color:var(--brand);background:#f6fafd}
.glink b{display:block;color:var(--brand);font-size:14.5px;margin-bottom:3px}
.glink small{display:block;color:var(--muted);font-size:12.6px;line-height:1.45}

/* ---------- grade page note box ---------- */
.notebox{background:#eef4f8;border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:10px;padding:16px 20px;font-size:15px;color:var(--ink2);line-height:1.65}