/* Lanfan Chem - shared styles */
:root{
  --brand:#0b4d8f; --brand-dark:#083a6d; --accent:#1a9e8f;
  --ink:#1e2a38; --muted:#5b6b7d; --line:#e4e9ef; --bg:#f6f8fb; --card:#ffffff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);line-height:1.7;background:#fff}
body.en{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(6px)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--brand-dark);letter-spacing:.5px}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900}
.nav nav{display:flex;gap:4px;align-items:center}
.nav nav a{padding:8px 12px;border-radius:8px;color:var(--ink);font-size:15px}
.nav nav a:hover{background:var(--bg);color:var(--brand)}
.lang{border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:13px;color:var(--brand);font-weight:700}
.lang:hover{border-color:var(--brand)}
.menu-btn{display:none;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px 12px;font-size:16px}
/* hero */
.hero{position:relative;color:#fff;overflow:hidden}
.hero img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero .shade{position:absolute;inset:0;background:linear-gradient(100deg,rgba(6,32,60,.88) 20%,rgba(6,32,60,.55) 60%,rgba(6,32,60,.25))}
.hero .inner{position:relative;padding:110px 20px 100px;max-width:1120px;margin:0 auto}
.hero h1{font-size:44px;line-height:1.25;margin-bottom:14px}
.hero p{font-size:18px;max-width:640px;opacity:.92;margin-bottom:28px}
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:700;padding:12px 28px;border-radius:999px;margin-right:12px}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;border:2px solid rgba(255,255,255,.7)}
/* sections */
section{padding:72px 0}
section.alt{background:var(--bg)}
.sec-title{text-align:center;margin-bottom:12px}
.sec-title h2{font-size:30px;color:var(--brand-dark)}
.sec-title p{color:var(--muted);margin-top:8px}
/* product */
.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin-top:36px;align-items:start}
.product-grid img{border-radius:14px;box-shadow:0 12px 32px rgba(8,58,109,.12)}
.spec{width:100%;border-collapse:collapse;margin-top:18px;background:var(--card);border-radius:12px;overflow:hidden;box-shadow:0 6px 20px rgba(8,58,109,.06)}
.spec th,.spec td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
.spec th{background:var(--brand);color:#fff;font-weight:600}
.spec tr:last-child td{border-bottom:none}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tags span{background:#e8f4f2;color:#0d6e63;font-size:13px;padding:5px 12px;border-radius:999px}
/* about */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin-top:36px;align-items:center}
.about-grid img{border-radius:14px}
.feats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px}
.feat h3{color:var(--brand-dark);margin-bottom:8px;font-size:18px}
.feat p{color:var(--muted);font-size:14px}
/* news */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.news{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;display:flex;flex-direction:column}
.news .date{font-size:13px;color:var(--accent);font-weight:700}
.news h3{margin:10px 0;font-size:17px;color:var(--brand-dark)}
.news p{color:var(--muted);font-size:14px;flex:1}
/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin-top:36px}
.citem{display:flex;gap:14px;margin-bottom:18px}
.citem .ic{width:44px;height:44px;flex:none;border-radius:12px;background:#e9f1fa;color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:20px}
.citem b{display:block}
.citem span{color:var(--muted)}
form.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px}
form.card label{display:block;font-size:14px;margin:12px 0 6px;font-weight:600}
form.card input,form.card textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:15px;font-family:inherit}
form.card textarea{min-height:110px;resize:vertical}
form.card button{margin-top:18px;border:none;cursor:pointer}
/* footer */
footer{background:#0a2540;color:#c7d5e4;padding:44px 0 26px;font-size:14px}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px;margin-bottom:28px}
footer h4{color:#fff;margin-bottom:12px}
footer a{color:#c7d5e4}
footer .copy{border-top:1px solid rgba(255,255,255,.14);padding-top:18px;text-align:center;color:#8fa3ba;font-size:13px}
/* responsive */
@media(max-width:860px){
  .nav nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px 18px;border-bottom:1px solid var(--line)}
  .nav nav.open{display:flex}
  .menu-btn{display:block}
  .hero .inner{padding:80px 20px 70px}
  .hero h1{font-size:32px}
  .product-grid,.about-grid,.contact-grid{grid-template-columns:1fr}
  .feats,.news-grid{grid-template-columns:1fr}
  footer .cols{grid-template-columns:1fr}
}

/* product pages */
.page-head{padding:52px 0 0}
.crumb{font-size:14px;color:var(--muted);margin-bottom:16px}
.crumb a{color:var(--brand)}
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;display:block;transition:all .2s}
.cat-card:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 10px 24px rgba(8,58,109,.10)}
.cat-card h3{color:var(--brand-dark);margin-bottom:6px;font-size:19px}
.cat-card p{color:var(--muted);font-size:14px;margin-bottom:10px}
.cat-card>span{color:var(--accent);font-weight:700;font-size:14px}
.cat-sec-title{margin:44px 0 4px;color:var(--brand-dark);font-size:24px}
.cat-sec-title small{color:var(--muted);font-weight:400;font-size:15px;margin-left:8px}
@media(max-width:860px){.cat-grid{grid-template-columns:1fr}}