:root{--ink:#122437;--ink2:#3c556e;--accent:#f2600c;--accent-d:#d14e04;--steel:#7e93a8;--bg:#f5f8fb;--card:#fff;--line:#e3ebf2;--radius:10px;--shadow:0 6px 24px rgba(18,36,55,.08)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
/* header */
.site-head{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.site-head.scrolled{box-shadow:var(--shadow)}
.head-in{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand img{height:40px;width:auto}
.brand-t{font-size:20px;font-weight:700;line-height:1.2}
.brand-t em{display:block;font-size:11px;font-style:normal;color:var(--steel);letter-spacing:2px}
.main-nav{margin-left:auto}
.main-nav>ul{display:flex;gap:4px}
.nav-item{position:relative}
.nav-item>a{display:block;padding:10px 14px;font-size:15px;border-radius:6px}
.nav-item>a:hover{color:var(--accent);background:#fff4ed}
.nav-item.on>a{color:var(--accent);font-weight:600}
.submenu{position:absolute;top:100%;left:8px;min-width:190px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:6px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s}
.nav-item:hover .submenu{opacity:1;visibility:visible;transform:none}
.submenu a{display:block;padding:9px 12px;font-size:14px;border-radius:6px}
.submenu a:hover{background:#fff4ed;color:var(--accent)}
.sub-toggle{display:none}
.head-tel{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:9px 18px;border-radius:999px;font-weight:600;font-size:15px;flex-shrink:0}
.head-tel:hover{background:var(--accent-d)}
.burger{display:none;background:none;border:0;cursor:pointer;padding:8px;margin-left:auto}
.burger span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{display:none}
/* hero */
.hero{position:relative;background:linear-gradient(100deg,rgba(10,22,35,.88) 15%,rgba(18,36,55,.55) 55%,rgba(18,36,55,.25)),url(/images/zhen4.jpg) center/cover no-repeat;color:#fff;padding:110px 0 120px}
.hero-kicker{color:#ffb184;letter-spacing:4px;font-size:14px;margin-bottom:14px}
.hero h1{font-size:42px;line-height:1.3;margin-bottom:18px}
.hero-sub{max-width:640px;color:#cfdae6;font-size:17px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-tags{display:flex;gap:22px;margin-top:44px;color:#9fb3c6;font-size:14px}
.hero-tags li::before{content:"✓";color:var(--accent);margin-right:6px}
/* buttons */
.btn{display:inline-block;padding:12px 28px;border-radius:8px;font-size:15px;font-weight:600;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-d)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{border-color:#fff}
.btn-line{border-color:var(--accent);color:var(--accent)}
.btn-line:hover{background:var(--accent);color:#fff}
.btn-light{background:#fff;color:var(--ink)}
.btn-block{display:block;text-align:center;width:100%}
/* sections */
.section{padding:72px 0}
.section-alt{background:#eef3f8}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:34px}
.sec-head.left{justify-content:flex-start;margin-bottom:18px}
.sec-head h2{font-size:28px}
.sec-head p{color:var(--steel);font-size:15px}
.sec-link{color:var(--accent);font-weight:600}
/* series cards */
.series-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.series-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:.2s;display:block}
.series-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:transparent}
.sc-no{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:2px}
.series-card h3{font-size:19px;margin:8px 0 10px}
.series-card p{color:var(--ink2);font-size:14px;margin-bottom:16px}
.sc-more{color:var(--accent);font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px}
/* products */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.prod-grid-4{grid-template-columns:repeat(4,1fr)}
.prod-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.prod-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.pc-img{display:block;aspect-ratio:4/3;overflow:hidden;background:#e9eef4}
.pc-img img{width:100%;height:100%;object-fit:cover}
.pc-name{padding:14px 16px;font-size:15px;font-weight:600;line-height:1.5}
/* news */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.2s}
.news-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.nc-img{aspect-ratio:16/9;overflow:hidden;background:#e9eef4;display:block}
.nc-img img{width:100%;height:100%;object-fit:cover}
.nc-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px}
.nc-body time{color:var(--steel);font-size:13px}
.nc-body h3{font-size:16px;line-height:1.55}
.nc-more{color:var(--accent);font-size:13px;font-weight:600;margin-top:auto}
.news-list{max-width:100%}
.news-row{display:flex;gap:18px;padding:15px 4px;border-bottom:1px dashed var(--line);align-items:baseline}
.news-row time{color:var(--steel);font-size:14px;flex-shrink:0;font-variant-numeric:tabular-nums}
.news-row a{font-size:15px}
.news-row a:hover{color:var(--accent)}
.side-list .news-row a{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
/* about split */
.about-split{display:grid;grid-template-columns:1fr 1.1fr;gap:44px;align-items:center}
.about-img img{border-radius:var(--radius);box-shadow:var(--shadow);aspect-ratio:4/3;object-fit:cover;width:100%}
.about-txt p{color:var(--ink2);margin-bottom:18px}
.about-facts{display:flex;gap:34px;margin:24px 0 28px}
.about-facts strong{font-size:20px;color:var(--accent);display:block}
.about-facts span{font-size:13px;color:var(--steel)}
/* chips */
.chips{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:30px}
.chip{padding:8px 18px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:14px;transition:.2s}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}
.lead{color:var(--ink2);max-width:820px;margin-bottom:28px}
/* page hero + crumbs */
.page-hero{background:linear-gradient(100deg,#0d1c2c,#1d3550);color:#fff;padding:56px 0}
.crumbs{font-size:13px;color:#8ba2b8;margin-bottom:10px;display:flex;flex-wrap:wrap;gap:8px}
.crumbs a:hover{color:#fff}
.crumbs span:not(:first-child)::before{content:"›";margin-right:8px;color:#5a7186}
.page-hero h1{font-size:32px;line-height:1.3}
/* detail */
.detail-grid{display:grid;grid-template-columns:1fr 340px;gap:36px;align-items:start}
.rich{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px 36px}
.rich p{margin:14px 0;color:var(--ink2)}
.rich img{border-radius:8px;margin:18px auto}
.rich h2,.rich h3{margin:24px 0 12px;font-size:20px}
.rich ul{list-style:disc;padding-left:22px;margin:12px 0;color:var(--ink2)}
.rich table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.rich th,.rich td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.rich th{background:#eef3f8}
.rich a{color:var(--accent)}
.detail-hero{margin-bottom:22px}
.detail-hero img{width:100%;max-height:420px;object-fit:contain;background:#f0f4f8;border-radius:8px}
.side .panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;position:sticky;top:96px}
.panel h3{font-size:18px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--accent);display:inline-block}
.pcontact li{display:flex;gap:10px;padding:8px 0;font-size:14px;color:var(--ink2)}
.pcontact li span{color:var(--steel);flex-shrink:0;width:36px}
.pcontact a{color:var(--accent);font-weight:600}
.panel-cta .btn{margin-top:14px}
/* contact */
.contact-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:44px}
.cc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center}
.cc h3{font-size:15px;color:var(--steel);font-weight:600;margin-bottom:12px}
.cc-big{font-size:19px;font-weight:700}
.cc-big a{color:var(--accent)}
.cc-addr{font-size:14px}
.contact-grid{margin-top:8px}
/* order form */
.order-wrap{max-width:820px}
.order-form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px 36px;margin-top:6px}
.frow{margin-bottom:18px}
.frow label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}
.frow input,.frow select,.frow textarea{width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit;background:#fbfdfe}
.frow input:focus,.frow select:focus,.frow textarea:focus{outline:none;border-color:var(--accent)}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-tip{font-size:13px;color:var(--steel);margin-top:14px}
/* cta band */
.cta-band{background:linear-gradient(100deg,#122437,#1d3550);color:#fff;padding:56px 0}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-in h2{font-size:26px}
.cta-in p{color:#9fb3c6;margin-top:6px}
.cta-in strong{color:var(--accent);font-size:20px}
/* footer */
.site-foot{background:#0d1c2c;color:#8ba2b8;font-size:14px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px;padding:56px 20px 40px}
.fcol h4{color:#fff;font-size:16px;margin-bottom:16px}
.fcol p{line-height:1.8}
.fcol li{padding:4px 0}
.fcol a:hover{color:#fff}
.fcontact li{padding:5px 0}
.foot-bar{display:flex;justify-content:space-between;gap:12px;padding:18px 20px;border-top:1px solid #1d3550;flex-wrap:wrap}
.foot-bar a:hover{color:#fff}
/* totop */
.totop{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:.25s;box-shadow:var(--shadow);z-index:90}
.totop.show{opacity:1;visibility:visible}
/* 404 */
.e404{min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px}
.e404 h1{font-size:64px;color:var(--accent)}
.e404 p{color:var(--ink2);margin:14px 0 26px}
/* responsive */
@media (max-width:1080px){
  .main-nav,.head-tel{display:none}
  .burger{display:block}
  .drawer{display:block;position:fixed;top:72px;left:0;right:0;bottom:0;height:calc(100vh - 72px);background:#fff;z-index:101;overflow-y:auto;transform:translateX(100%);transition:transform .25s}
  .drawer.open{transform:none}
  .drawer ul{padding:10px 20px}
  .drawer .nav-item{border-bottom:1px solid var(--line)}
  .drawer .nav-item>a{display:flex;justify-content:space-between;align-items:center;padding:16px 4px;font-size:16px;border-radius:0}
  .drawer .submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 6px 14px;display:none;min-width:0}
  .drawer .nav-item.sub-open .submenu{display:block}
  .drawer .sub-toggle{display:inline-flex;background:none;border:0;padding:6px;color:var(--steel)}
  .drawer .sub-toggle svg{transition:.2s}
  .drawer .nav-item.sub-open .sub-toggle svg{transform:rotate(180deg)}
  .drawer-tel{display:block;margin:20px;text-align:center;background:var(--accent);color:#fff;padding:13px;border-radius:8px;font-weight:600}
  .series-grid{grid-template-columns:repeat(2,1fr)}
  .prod-grid,.prod-grid-4{grid-template-columns:repeat(3,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .contact-cards{grid-template-columns:repeat(2,1fr)}
  .about-split{grid-template-columns:1fr;gap:28px}
  .detail-grid{grid-template-columns:1fr}
  .side .panel{position:static}
  .hero h1{font-size:32px}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  .section{padding:52px 0}
  .series-grid,.prod-grid,.prod-grid-4,.news-grid{grid-template-columns:1fr 1fr}
  .contact-cards{grid-template-columns:1fr 1fr}
  .hero{padding:72px 0}
  .hero h1{font-size:26px}
  .hero-sub{font-size:15px}
  .page-hero h1{font-size:24px}
  .sec-head h2{font-size:22px}
  .rich{padding:22px 18px}
  .order-form{padding:24px 18px}
  .f2{grid-template-columns:1fr}
  .about-facts{gap:20px}
  .series-grid{grid-template-columns:1fr}
  .prod-grid,.prod-grid-4{grid-template-columns:1fr 1fr;gap:12px}
  .pc-name{font-size:13px;padding:10px 12px}
  .foot-grid{grid-template-columns:1fr;gap:24px}
  .brand-t{font-size:17px}
}