/* ===== Ningbo Yuhai — Core Styles ===== */
:root{
  --navy:#16305f;
  --navy-d:#0f2347;
  --copper:#c46c3e;
  --copper-l:#d98a5f;
  --ink:#1c2430;
  --grey:#6b7684;
  --line:#e3e7ee;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --radius:10px;
  --max:1180px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- Header ---------- */
header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:52px;width:auto}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{font-size:15px;font-weight:500;color:var(--grey);transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--navy)}
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:12px 24px;border-radius:8px;font-weight:600;font-size:15px;
  transition:.2s;border:1.5px solid transparent;cursor:pointer;
}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-d);transform:translateY(-1px)}
.btn-copper{background:var(--copper);color:#fff}
.btn-copper:hover{background:var(--copper-l);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--navy);background:#fff}
.btn-ghost:hover{border-color:var(--navy);background:var(--bg-soft)}
.btn-sm{padding:9px 18px;font-size:14px}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-d) 100%);
  color:#fff;padding:88px 0 96px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-120px;top:-80px;width:520px;height:520px;
  border-radius:50%;background:rgba(196,108,62,.12);filter:blur(60px);
}
.hero-inner{position:relative;z-index:2;max-width:760px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--copper-l);margin-bottom:22px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--copper-l)}
.hero h1{
  font-size:clamp(32px,4.6vw,54px);line-height:1.15;font-weight:800;
  letter-spacing:-.02em;margin-bottom:22px;
}
.hero h1 em{font-style:normal;color:var(--copper-l)}
.hero p{font-size:18px;color:#c3cfe3;max-width:600px;margin-bottom:34px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- Trust bar ---------- */
.trust{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:22px 0}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.trust-item{font-size:14px;font-weight:600;color:var(--navy);display:flex;align-items:center;justify-content:center;gap:8px}
.trust-item span{color:var(--copper);font-size:18px}

/* ---------- Sections ---------- */
section{padding:80px 0}
.sec-head{max-width:640px;margin-bottom:48px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head h2{font-size:clamp(26px,3vw,38px);font-weight:800;letter-spacing:-.02em;margin-bottom:14px;color:var(--navy)}
.sec-head p{font-size:17px;color:var(--grey)}

/* ---------- Category grid ---------- */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cat{
  border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;
  background:#fff;transition:.25s;position:relative;overflow:hidden;
}
.cat:hover{border-color:var(--navy);transform:translateY(-3px);box-shadow:0 12px 32px rgba(22,48,95,.08)}
.cat-icon{
  width:46px;height:46px;border-radius:10px;background:var(--bg-soft);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:18px;
}
.cat h3{font-size:18px;font-weight:700;margin-bottom:8px;color:var(--navy)}
.cat p{font-size:14px;color:var(--grey);margin-bottom:14px}
.cat .cnt{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--copper)}

/* ---------- Why us ---------- */
.why{background:var(--bg-soft)}
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.why-card{background:#fff;border-radius:var(--radius);padding:32px;border:1px solid var(--line)}
.why-card h3{font-size:19px;font-weight:700;margin-bottom:10px;color:var(--navy);display:flex;align-items:center;gap:10px}
.why-card h3 i{
  width:30px;height:30px;border-radius:8px;background:var(--copper);
  color:#fff;font-style:normal;font-size:15px;display:flex;align-items:center;justify-content:center;flex:none;
}
.why-card p{font-size:15px;color:var(--grey)}

/* ---------- CTA band ---------- */
.cta-band{background:var(--navy);color:#fff;padding:64px 0;text-align:center}
.cta-band h2{font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:14px}
.cta-band p{color:#c3cfe3;margin-bottom:30px;font-size:16px}

/* ---------- Products page ---------- */
.page-head{background:var(--navy);color:#fff;padding:64px 0}
.page-head h1{font-size:clamp(28px,3.6vw,42px);font-weight:800;margin-bottom:12px}
.page-head p{color:#c3cfe3;max-width:620px}
.pgroup{margin-bottom:56px}
.pgroup-head{display:flex;align-items:baseline;gap:14px;margin-bottom:24px;padding-bottom:12px;border-bottom:2px solid var(--line)}
.pgroup-head h2{font-size:22px;font-weight:700;color:var(--navy)}
.pgroup-head span{font-size:13px;color:var(--copper);font-weight:700;letter-spacing:.06em}
.plist{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.pitem{
  border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;
  transition:.2s;background:#fff;
}
.pitem:hover{border-color:var(--copper);box-shadow:0 8px 24px rgba(196,108,62,.08)}
.pitem h4{font-size:15px;font-weight:700;color:var(--navy);margin-bottom:6px}
.pitem .spec{font-size:13px;color:var(--grey);line-height:1.55}
.pitem .moq{font-size:12px;color:var(--copper);font-weight:600;margin-top:10px}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:56px;align-items:start}
.about-body h2{font-size:28px;font-weight:800;color:var(--navy);margin-bottom:18px}
.about-body p{font-size:16px;color:var(--grey);margin-bottom:16px}
.facts{background:var(--bg-soft);border-radius:var(--radius);padding:32px}
.facts h3{font-size:15px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--copper);margin-bottom:20px}
.fact{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}
.fact:last-child{border-bottom:none}
.fact dt{color:var(--grey)}
.fact dd{font-weight:600;color:var(--navy);text-align:right}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px}
.citem{display:flex;gap:16px;margin-bottom:28px}
.citem .ic{
  width:44px;height:44px;border-radius:10px;background:var(--navy);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:19px;flex:none;
}
.citem h3{font-size:14px;font-weight:600;color:var(--grey);margin-bottom:4px}
.citem a,.citem p{font-size:16px;font-weight:600;color:var(--navy);word-break:break-word}
.citem a:hover{color:var(--copper)}

form{background:var(--bg-soft);padding:34px;border-radius:var(--radius)}
form h3{font-size:19px;font-weight:700;color:var(--navy);margin-bottom:6px}
form .sub{font-size:14px;color:var(--grey);margin-bottom:22px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;
  font-size:15px;font-family:inherit;background:#fff;transition:.2s;
}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(22,48,95,.08);
}
.field textarea{resize:vertical;min-height:110px}

/* ---------- Footer ---------- */
footer{background:var(--navy-d);color:#a9b8d1;padding:56px 0 28px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:48px;margin-bottom:40px}
.foot-brand img{height:46px;margin-bottom:16px}
.foot-brand p{max-width:320px;line-height:1.7;color:#8fa1bf}
footer h4{color:#fff;font-size:14px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px}
footer ul{list-style:none}
footer li{margin-bottom:10px}
footer a:hover{color:var(--copper-l)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:#7a8cab;font-size:13px}

/* ---------- Mobile ---------- */
@media(max-width:900px){
  .nav-links{display:none}
  .hero{padding:64px 0 72px}
  .cats,.plist,.why-grid,.contact-grid,.about-grid{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .foot-grid{grid-template-columns:1fr;gap:32px}
  section{padding:56px 0}
}