:root{
  --navy:#173a5e;
  --navy-2:#1d4a73;
  --green:#0f766e;
  --green-dark:#0b5952;
  --ink:#1e2a36;
  --gray:#5c6b7a;
  --line:#e4e9ef;
  --bg:#f5f8fa;
  --white:#fff;
  --shadow:0 10px 30px rgba(23,58,94,.10);
  --shadow-lg:0 24px 60px rgba(23,58,94,.16);
  --radius:14px;
  --maxw:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
  color:var(--ink);background:var(--white);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section.alt{background:var(--bg)}
.sec-head{max-width:720px;margin:0 auto 52px;text-align:center}
.sec-head .kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.18em;
  color:var(--green-dark);text-transform:uppercase;margin-bottom:12px;
}
.sec-head .kicker::before,.sec-head .kicker::after{
  content:"";width:26px;height:2px;background:var(--green);border-radius:2px;
}
.sec-head h2{font-size:clamp(26px,3.6vw,38px);color:var(--navy);letter-spacing:.02em}
.sec-head p{margin-top:12px;color:var(--gray);font-size:15px}

/* ============ 顶部导航 ============ */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;height:76px;
  display:flex;align-items:center;
  background:rgba(255,255,255,0);transition:background .3s,box-shadow .3s;
}
.nav.scrolled{background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 2px 18px rgba(33,29,28,.10)}
.nav .container{display:flex;align-items:center;justify-content:space-between;width:100%}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:52px;width:auto}
.brand .bname{display:none}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  position:relative;padding:10px 16px;font-size:15px;font-weight:600;
  color:#fff;border-radius:8px;transition:color .25s;
}
.nav-links a::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;
  background:var(--green);transform:scaleX(0);transform-origin:left;transition:transform .25s;border-radius:2px;
}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
.nav.scrolled .nav-links a{color:var(--ink)}
.nav-cta{
  margin-left:14px;padding:10px 20px!important;border-radius:999px!important;
  background:var(--green);color:#fff!important;font-weight:700;
  box-shadow:0 6px 16px rgba(15,118,110,.4);transition:transform .2s;
}
.nav-cta:hover{transform:translateY(-2px)}
.nav-cta::after{display:none}
.burger{display:none;background:none;border:0;cursor:pointer;padding:8px}
.burger span{display:block;width:24px;height:2px;background:#fff;margin:6px 0;transition:.3s;border-radius:2px}
.nav.scrolled .burger span{background:var(--ink)}
.nav.open .burger span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav.open .burger span:nth-child(2){opacity:0}
.nav.open .burger span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ============ Hero 轮播 ============ */
.hero{position:relative;height:100svh;min-height:560px;overflow:hidden;background:var(--navy)}
.slide{
  position:absolute;inset:0;opacity:0;transition:opacity 1s ease;
  background-size:cover;background-position:center;
}
.slide.active{opacity:1}
.slide::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(30,8,6,.82) 0%,rgba(30,8,6,.55) 45%,rgba(30,8,6,.15) 100%);
}
.hero-inner{
  position:relative;z-index:2;height:100%;display:flex;flex-direction:column;
  justify-content:center;max-width:var(--maxw);margin:0 auto;padding:0 24px;color:#fff;
}
.hero-inner .tag{
  display:inline-flex;align-items:center;gap:10px;width:max-content;
  padding:8px 18px;border:1px solid rgba(255,255,255,.35);border-radius:999px;
  font-size:13px;letter-spacing:.28em;margin-bottom:26px;backdrop-filter:blur(4px);
}
.hero-inner .tag::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 12px var(--green)}
.hero-inner h1{
  font-size:clamp(34px,6vw,64px);line-height:1.18;letter-spacing:.04em;
  text-shadow:0 4px 30px rgba(0,0,0,.35);max-width:16em;
}
.hero-inner h1 em{font-style:normal;color:#ff6f62}
.hero-inner p{
  margin-top:22px;font-size:clamp(15px,1.8vw,19px);color:rgba(255,255,255,.88);
  max-width:34em;letter-spacing:.06em;
}
.hero-actions{display:flex;gap:16px;margin-top:40px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 34px;
  border-radius:999px;font-size:16px;font-weight:700;transition:.25s;
}
.btn-green{background:var(--green);color:#fff;box-shadow:0 10px 26px rgba(15,118,110,.45)}
.btn-green:hover{background:var(--green-dark);transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.dots{position:absolute;left:50%;bottom:34px;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.dots button{
  width:34px;height:5px;border-radius:3px;border:0;cursor:pointer;
  background:rgba(255,255,255,.35);transition:.3s;
}
.dots button.active{background:var(--green);width:52px}
.scroll-hint{
  position:absolute;right:34px;bottom:30px;z-index:3;color:rgba(255,255,255,.75);
  font-size:12px;letter-spacing:.2em;writing-mode:vertical-rl;display:flex;align-items:center;gap:10px;
}
.scroll-hint::after{content:"";width:1px;height:44px;background:linear-gradient(#fff,transparent);animation:drop 1.8s infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}55%{transform:scaleY(1);transform-origin:top}56%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ============ 数据条 ============ */
.stats{background:var(--navy);color:#fff;padding:0}
.stats .container{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  transform:translateY(-50%);background:rgba(255,255,255,.14);
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);
}
.stat{background:var(--navy-2);padding:34px 18px;text-align:center}
.stat b{display:block;font-size:clamp(30px,3.4vw,42px);color:#ff6f62;font-variant-numeric:tabular-nums}
.stat span{font-size:14px;color:rgba(255,255,255,.82);letter-spacing:.1em}

/* ============ 关于 ============ */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.about-grid h3{font-size:clamp(22px,2.6vw,30px);color:var(--navy);margin-bottom:18px}
.about-grid p{color:var(--gray);margin-bottom:14px;text-align:justify}
.about-vals{display:grid;gap:14px;margin-top:26px}
.val{
  display:flex;gap:14px;align-items:flex-start;background:var(--white);
  border:1px solid var(--line);border-radius:12px;padding:16px 18px;transition:.25s;
}
.val:hover{border-color:var(--green);box-shadow:var(--shadow);transform:translateY(-2px)}
.val svg{flex:none;width:26px;height:26px;stroke:var(--green);fill:none;stroke-width:1.8;margin-top:3px}
.val b{color:var(--navy)}
.val p{margin:2px 0 0;font-size:14px;text-align:left}
.about-visual{position:relative}
.about-visual .frame{
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);
  border:6px solid var(--white);
}
.about-visual .badge{
  position:absolute;left:-18px;bottom:28px;background:var(--green);color:#fff;
  border-radius:12px;padding:16px 22px;box-shadow:var(--shadow-lg);
}
.about-visual .badge b{display:block;font-size:26px;line-height:1.2}
.about-visual .badge span{font-size:12px;letter-spacing:.14em}

/* ============ 产品 ============ */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.prod{
  display:block;height:100%;
  position:relative;background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius);padding:34px 28px 30px;overflow:hidden;transition:.3s;
}
.prod::before{
  content:"";position:absolute;inset:auto 0 0 0;height:4px;background:var(--green);
  transform:scaleX(0);transform-origin:left;transition:transform .3s;
}
.prod:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.prod:hover::before{transform:scaleX(1)}
.prod .ico{
  width:64px;height:64px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#fdecea,#f6c8c3);margin-bottom:20px;
}
.prod .ico svg{width:34px;height:34px;stroke:var(--green-dark);fill:none;stroke-width:1.6}
.prod h3{font-size:20px;color:var(--navy);margin-bottom:10px}
.prod p{font-size:14px;color:var(--gray)}
.prod .en{position:absolute;right:18px;top:20px;font-size:12px;font-weight:800;letter-spacing:.16em;color:#d7dee6;text-transform:uppercase}

/* ============ 品牌 ============ */
.brand-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.brand-card{
  background:var(--white);border-radius:var(--radius);border:1px solid var(--line);
  padding:34px 28px;position:relative;overflow:hidden;transition:.3s;
}
.brand-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.brand-card .mark{
  font-size:24px;font-weight:800;letter-spacing:.04em;color:var(--navy);margin-bottom:6px;
}
.brand-card .mark span{color:var(--green-dark)}
.brand-card .origin{font-size:12px;letter-spacing:.2em;color:#9aa8b5;text-transform:uppercase;margin-bottom:18px}
.brand-card p{font-size:14px;color:var(--gray);text-align:justify}
.brand-card .num{
  position:absolute;right:16px;top:8px;font-size:64px;font-weight:800;
  color:rgba(33,29,28,.05);line-height:1;
}

/* ============ 新闻 ============ */
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.news{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;display:flex;flex-direction:column;gap:12px;transition:.3s;
}
.news:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--green)}
.news time{
  width:max-content;font-size:12px;font-weight:700;color:var(--green-dark);
  background:#fdecea;padding:4px 12px;border-radius:999px;font-variant-numeric:tabular-nums;
}
.news h3{font-size:16px;color:var(--navy);line-height:1.55;flex:1}
.news .more{font-size:13px;color:var(--gray);display:inline-flex;align-items:center;gap:6px}
.news:hover .more{color:var(--green-dark)}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.contact-card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 30px;transition:.3s;display:flex;gap:18px;align-items:flex-start;
}
.contact-card:hover{box-shadow:var(--shadow);border-color:var(--green)}
.contact-card svg{flex:none;width:30px;height:30px;stroke:var(--green-dark);fill:none;stroke-width:1.7;margin-top:4px}
.contact-card b{display:block;font-size:15px;color:var(--navy);margin-bottom:6px;letter-spacing:.06em}
.contact-card p,.contact-card a{font-size:15px;color:var(--gray)}
.contact-card a:hover{color:var(--green-dark)}
.contact-card.wide{grid-column:1/-1;align-items:center}
.qr{width:96px;height:96px;border-radius:10px;border:1px solid var(--line)}
.contact-cta{
  margin-top:34px;background:linear-gradient(120deg,var(--navy) 0%,var(--navy-2) 100%);
  border-radius:var(--radius);padding:44px 40px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  box-shadow:var(--shadow-lg);
}
.contact-cta h3{font-size:clamp(20px,2.4vw,26px);letter-spacing:.04em}
.contact-cta p{color:rgba(255,255,255,.8);margin-top:6px;font-size:14px}

/* ============ 页脚 ============ */
footer{background:#1a1513;color:rgba(255,255,255,.65);padding:46px 0 30px;font-size:13px}
footer .container{display:flex;flex-direction:column;gap:14px;align-items:center;text-align:center}
footer .flinks{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;color:rgba(255,255,255,.8)}
footer .flinks a:hover{color:var(--green)}
footer .icp a{color:rgba(255,255,255,.55)}
footer .icp a:hover{color:var(--green)}

/* ============ 滚动显现 ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}.d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .scroll-hint::after{animation:none}
}

/* ============ 响应式 ============ */
@media (max-width:960px){
  .prod-grid,.brand-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .stats .container{grid-template-columns:repeat(2,1fr);transform:translateY(-30%)}
  .stats{padding-top:56px}
  .section{padding:64px 0}
}
@media (max-width:640px){
  .burger{display:block}
  .nav-links{
    position:fixed;inset:76px 0 auto 0;flex-direction:column;align-items:stretch;
    background:rgba(255,255,255,.98);backdrop-filter:blur(14px);padding:16px 24px 26px;gap:2px;
    box-shadow:0 18px 40px rgba(33,29,28,.18);
    transform:translateY(-130%);transition:transform .35s ease;
  }
  .nav.open .nav-links{transform:none}
  .nav-links a{color:var(--ink)!important;padding:13px 10px;font-size:16px;border-radius:10px}
  .nav-links a:hover{background:#f5f1f0}
  .nav-cta{margin:10px 0 0;text-align:center;justify-content:center}
  .prod-grid,.brand-grid,.news-grid,.contact-grid{grid-template-columns:1fr}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .hero{min-height:520px}
  .hero-actions .btn{padding:12px 26px;font-size:15px}
  .scroll-hint{display:none}
  .contact-cta{padding:32px 24px}
}

/* ================= 子页面：导航下拉 ================= */
.nav-item{position:relative;display:flex;align-items:center}
.sub{
  position:absolute;top:calc(100% + 4px);left:6px;min-width:236px;
  background:#fff;border-radius:12px;box-shadow:0 18px 44px rgba(33,29,28,.18);
  padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .22s,transform .22s,visibility .22s;
}
.nav-item:hover .sub,.nav-item:focus-within .sub{opacity:1;visibility:visible;transform:none}
.sub a{
  display:block;padding:10px 14px;font-size:14px;font-weight:500;
  color:var(--ink)!important;border-radius:8px;white-space:nowrap;
}
.sub a:hover{background:#f5f1f0;color:var(--green-dark)!important}
.sub a::after{display:none!important}
.nav-item>a .caret{display:inline-block;margin-left:5px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;vertical-align:middle;opacity:.7}

/* ================= 子页面：页首 ================= */
.page-hero{
  position:relative;padding:150px 0 76px;color:#fff;overflow:hidden;
  background:var(--navy);
}
.page-hero .bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.42;transform:scale(1.02);
}
.page-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(34,10,7,.94) 0%,rgba(34,10,7,.72) 55%,rgba(34,10,7,.35) 100%);
}
.page-hero .container{position:relative;z-index:2}
.page-hero .kicker{
  display:inline-block;font-size:13px;letter-spacing:.26em;color:#ff6f62;
  font-weight:700;text-transform:uppercase;margin-bottom:14px;
}
.page-hero h1{font-size:clamp(28px,4.6vw,46px);letter-spacing:.04em;line-height:1.25}
.page-hero p{margin-top:16px;max-width:44em;color:rgba(255,255,255,.85);font-size:16px;letter-spacing:.03em}
.crumb{
  background:#f2eeec;border-bottom:1px solid var(--line);
  font-size:13px;color:var(--gray);
}
.crumb .container{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding-top:13px;padding-bottom:13px}
.crumb a:hover{color:var(--green-dark)}
.crumb .sep{opacity:.45}
.crumb .cur{color:var(--navy);font-weight:600}

/* ================= 子页面：正文块 ================= */
.lead{font-size:16px;color:var(--gray);text-align:justify;max-width:56em}
.lead strong{color:var(--navy)}
.prose h2{font-size:clamp(20px,2.4vw,26px);color:var(--navy);margin-bottom:16px}
.prose h3{font-size:17px;color:var(--navy);margin:26px 0 10px}
.prose p{color:var(--gray);margin-bottom:12px;text-align:justify}
.prose ul.dots-list{margin:10px 0 18px;display:grid;gap:9px}
.prose ul.dots-list li{
  position:relative;padding-left:20px;color:var(--gray);font-size:15px;
}
.prose ul.dots-list li::before{
  content:"";position:absolute;left:2px;top:.66em;width:7px;height:7px;
  border-radius:50%;background:var(--green);
}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:start}
.split.rev{grid-template-columns:.95fr 1.05fr}
.split .visual{
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);
  border:6px solid #fff;background:#fff;
}
.split .visual img{width:100%}
.feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:8px}
.feat{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;
  display:flex;gap:12px;align-items:flex-start;transition:.25s;
}
.feat:hover{border-color:var(--green);box-shadow:var(--shadow);transform:translateY(-2px)}
.feat .dot{
  flex:none;width:26px;height:26px;border-radius:8px;background:#fdecea;
  color:var(--green-dark);font-weight:800;font-size:13px;
  display:flex;align-items:center;justify-content:center;margin-top:2px;
}
.feat b{display:block;color:var(--navy);font-size:15px}
.feat span{font-size:13.5px;color:var(--gray);line-height:1.6}

/* 参数表 */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table.spec{width:100%;border-collapse:collapse;min-width:520px;font-size:14.5px}
table.spec th,table.spec td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
table.spec thead th{background:var(--navy);color:#fff;font-weight:600;letter-spacing:.06em;font-size:13.5px}
table.spec tbody tr:nth-child(even){background:#fbf8f7}
table.spec tbody th{color:var(--navy);font-weight:600;width:34%;background:#f9f6f5}
table.spec tbody tr:last-child th,table.spec tbody tr:last-child td{border-bottom:0}
.note{font-size:12.5px;color:#8d9aa8;margin-top:10px}

/* 应用领域标签 */
.tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.tags span{
  padding:8px 18px;border-radius:999px;background:#fdecea;color:var(--green-dark);
  font-size:14px;font-weight:600;border:1px solid #f6c8c3;
}

/* 系列卡片 */
.series{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.series article{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--green);
  border-radius:12px;padding:22px 24px;transition:.25s;
}
.series article:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.series h4{font-size:16.5px;color:var(--navy);margin-bottom:8px}
.series p{font-size:14px;color:var(--gray);margin:0}

/* 相关产品 */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.rel{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;transition:.3s;display:block;
}
.rel:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--green)}
.rel small{font-size:12px;letter-spacing:.18em;color:#9aa8b5;text-transform:uppercase}
.rel h4{font-size:17px;color:var(--navy);margin:6px 0 8px}
.rel p{font-size:13.5px;color:var(--gray);margin:0}

/* 产品列表页 */
.plist{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pcard{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;transition:.3s;
}
.pcard:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.pcard .thumb{height:180px;overflow:hidden;background:#f2eeec}
.pcard .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.pcard:hover .thumb img{transform:scale(1.06)}
.pcard .body{padding:24px 24px 26px;display:flex;flex-direction:column;flex:1}
.pcard .body small{font-size:11.5px;letter-spacing:.18em;color:#9aa8b5;text-transform:uppercase}
.pcard h3{font-size:19px;color:var(--navy);margin:8px 0 10px}
.pcard p{font-size:14px;color:var(--gray);flex:1}
.pcard .go{margin-top:16px;font-size:14px;font-weight:700;color:var(--green-dark)}

@media (max-width:960px){
  .split,.split.rev{grid-template-columns:1fr;gap:34px}
  .plist,.rel-grid{grid-template-columns:repeat(2,1fr)}
  .series{grid-template-columns:1fr}
  .page-hero{padding:124px 0 60px}
}
@media (max-width:640px){
  .plist,.rel-grid,.feat-grid{grid-template-columns:1fr}
  .nav-item{display:block;width:100%}
  .sub{
    position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;
    background:transparent;padding:0 0 0 14px;min-width:0;
  }
  .sub a{padding:9px 10px;font-size:15px;color:var(--gray)!important}
  .nav-item>a .caret{display:none}
}

/* FLOWSERVE 品牌标准红（PMS 179 C） */
.fs-red{color:#ed383c}