/* ===========================================================
   Weihai Fengyuan Carbon Products Co., Ltd.
   English site stylesheet
   =========================================================== */

:root{
  --bg:#07090c;
  --bg-soft:#0b0e13;
  --surface:#0f141b;
  --surface-2:#131a23;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);
  --text:#e9eef6;
  --muted:#94a3b5;
  --accent:#2f7bff;
  --accent-soft:rgba(47,123,255,.14);
  --radius:2px;
  --max:1200px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Inter","Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}

::selection{background:var(--accent);color:#fff}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 28px}
.section{padding:110px 0;position:relative}
.section--tight{padding:80px 0}
.section--alt{background:var(--bg-soft)}
.section-head{max-width:720px;margin-bottom:56px}
.section-head--center{margin-left:auto;margin-right:auto;text-align:center}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:11.5px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin:0 0 18px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--accent);display:block}
.section-head--center .eyebrow::after{content:"";width:26px;height:1px;background:var(--accent);display:block}

h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.18;letter-spacing:-.015em}
h2{font-size:clamp(28px,3.4vw,42px)}
h3{font-size:19px;letter-spacing:0}
p{margin:0}
.lead{color:var(--muted);font-size:17px;line-height:1.8}

/* ---------- header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:60;
  border-bottom:1px solid transparent;
  transition:background .35s var(--ease),border-color .35s var(--ease),backdrop-filter .35s;
}
.site-header.is-scrolled{
  background:rgba(7,9,12,.86);
  backdrop-filter:saturate(140%) blur(14px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  height:78px;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  width:34px;height:34px;flex:none;border-radius:2px;
  background:
    linear-gradient(135deg,rgba(47,123,255,.95),rgba(47,123,255,.35)),
    repeating-linear-gradient(45deg,rgba(255,255,255,.22) 0 2px,transparent 2px 4px);
  background-blend-mode:screen;
  box-shadow:0 0 0 1px rgba(255,255,255,.12) inset;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-name{font-size:14.5px;font-weight:600;letter-spacing:.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-sub{font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}

.nav{display:flex;align-items:center;gap:4px}
.nav a{
  padding:9px 14px;font-size:13.5px;letter-spacing:.02em;color:#c3cddb;
  border-radius:2px;transition:color .2s,background .2s;
}
.nav a:hover{color:#fff;background:rgba(255,255,255,.05)}
.nav a.is-active{color:#fff}
.nav a.is-active::after{
  content:"";display:block;height:2px;margin-top:6px;background:var(--accent);
}
.header-actions{display:flex;align-items:center;gap:12px}
.lang{
  font-size:12px;letter-spacing:.08em;color:var(--muted);
  border:1px solid var(--line);padding:7px 12px;border-radius:2px;
  transition:.25s;white-space:nowrap;
}
.lang:hover{color:#fff;border-color:var(--line-strong)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;font-size:13.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  border-radius:2px;border:1px solid transparent;cursor:pointer;
  transition:transform .35s var(--ease),background .3s,border-color .3s,color .3s;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 12px 28px -14px rgba(47,123,255,.9)}
.btn--primary:hover{background:#3f88ff}
.btn--ghost{border-color:var(--line-strong);color:#dce5f0}
.btn--ghost:hover{border-color:#fff;color:#fff}
.btn--sm{padding:10px 18px;font-size:12px}

.nav-toggle{
  display:none;width:40px;height:40px;border:1px solid var(--line);
  background:transparent;border-radius:2px;cursor:pointer;position:relative;
}
.nav-toggle span{
  position:absolute;left:11px;width:18px;height:1.5px;background:#fff;transition:.3s var(--ease);
}
.nav-toggle span:nth-child(1){top:15px}
.nav-toggle span:nth-child(2){top:21px}
.nav-toggle span:nth-child(3){top:27px}
body.nav-open .nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg)}
body.nav-open .nav-toggle span:nth-child(2){opacity:0}
body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:140px 0 90px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;object-position:center 55%;transform:scale(1.04)}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(120% 90% at 12% 30%,rgba(7,9,12,.94) 0%,rgba(7,9,12,.72) 42%,rgba(7,9,12,.28) 70%,rgba(7,9,12,.72) 100%),
    linear-gradient(180deg,rgba(7,9,12,.86) 0%,rgba(7,9,12,.25) 35%,rgba(7,9,12,.92) 100%);
}
.hero-inner{position:relative;z-index:2;max-width:820px}
.hero h1{
  font-size:clamp(34px,5.2vw,64px);line-height:1.08;font-weight:600;
  letter-spacing:-.03em;margin-bottom:26px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{color:#b9c6d6;font-size:clamp(15px,1.4vw,18px);line-height:1.75;max-width:640px;margin-bottom:38px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px}

.hero-stats{
  position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);
  gap:1px;margin-top:72px;background:var(--line);
  border:1px solid var(--line);
}
.hero-stats div{background:rgba(9,12,17,.72);backdrop-filter:blur(6px);padding:22px 24px}
.hero-stats strong{display:block;font-size:26px;font-weight:600;letter-spacing:-.02em;line-height:1.2}
.hero-stats span{display:block;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:6px}

/* ---------- about ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split-media{position:relative}
.split-media img{width:100%;aspect-ratio:4/3;object-fit:cover;filter:contrast(1.04) saturate(1.02)}
.split-media::after{
  content:"";position:absolute;inset:0;border:1px solid var(--line-strong);pointer-events:none;
}
.split-media--offset{margin-top:36px}
.prose p+p{margin-top:18px}
.prose{color:#aab7c7;font-size:16px;line-height:1.85}
.prose strong{color:#e9eef6;font-weight:600}

.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px;border-top:1px solid var(--line);padding-top:28px}
.stat-row strong{display:block;font-size:30px;font-weight:600;letter-spacing:-.02em}
.stat-row span{font-size:12px;color:var(--muted);letter-spacing:.1em;text-transform:uppercase}

/* ---------- product cards ---------- */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.p-card{
  position:relative;background:var(--surface);border:1px solid var(--line);
  overflow:hidden;transition:border-color .4s var(--ease),transform .4s var(--ease),background .4s;
}
.p-card:hover{border-color:var(--line-strong);transform:translateY(-4px);background:var(--surface-2)}
.p-card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:#0a0d12}
.p-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.p-card:hover .p-card-media img{transform:scale(1.05)}
.p-card-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 45%,rgba(7,9,12,.65) 100%);
}
.p-card-index{
  position:absolute;top:18px;left:20px;z-index:2;
  font-size:11px;letter-spacing:.2em;color:rgba(255,255,255,.62);
  border-left:1px solid var(--accent);padding-left:9px;
}
.p-card-body{padding:26px 28px 30px}
.p-card-body h3{margin-bottom:10px}
.p-card-body p{color:var(--muted);font-size:14.5px;line-height:1.7}
.p-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{
  font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#a9bad0;
  border:1px solid var(--line);padding:5px 10px;border-radius:2px;
}

/* ---------- advantages ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.feature{background:var(--bg);padding:38px 32px;transition:background .35s}
.feature:hover{background:var(--surface)}
.feature-num{
  font-size:11px;letter-spacing:.2em;color:var(--accent);margin-bottom:20px;display:block;
}
.feature h3{font-size:17px;margin-bottom:12px}
.feature p{color:var(--muted);font-size:14.5px;line-height:1.75}

/* ---------- applications ---------- */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.app{
  border:1px solid var(--line);padding:26px 24px;background:linear-gradient(180deg,rgba(255,255,255,.02),transparent);
  transition:.35s var(--ease);
}
.app:hover{border-color:rgba(47,123,255,.5);background:var(--accent-soft)}
.app h3{font-size:15.5px;margin-bottom:8px}
.app p{font-size:13.5px;color:var(--muted)}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.news-card{border:1px solid var(--line);background:var(--surface);overflow:hidden;transition:.35s var(--ease);display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-4px);border-color:var(--line-strong)}
.news-thumb{aspect-ratio:16/9;overflow:hidden}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.news-card:hover .news-thumb img{transform:scale(1.05)}
.news-body{padding:22px 24px 26px;flex:1;display:flex;flex-direction:column}
.news-date{font-size:11.5px;letter-spacing:.14em;color:var(--accent);margin-bottom:12px}
.news-body h3{font-size:16px;line-height:1.45;margin-bottom:10px}
.news-body p{font-size:13.5px;color:var(--muted);flex:1}

/* ---------- cta band ---------- */
.cta-band{
  position:relative;padding:96px 0;overflow:hidden;border-top:1px solid var(--line);
  background:linear-gradient(120deg,#0a1017 0%,#0d1723 55%,#0a1017 100%);
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.028) 0 1px,transparent 1px 9px);
  opacity:.8;
}
.cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.cta-inner h2{font-size:clamp(26px,3.2vw,38px)}

/* ---------- footer ---------- */
.site-footer{background:#05070a;border-top:1px solid var(--line);padding:72px 0 32px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:48px}
.footer-brand .brand{margin-bottom:20px}
.footer-brand p{color:var(--muted);font-size:13.5px;line-height:1.8;max-width:300px}
.footer-col h4{
  font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:#fff;
  margin-bottom:20px;font-weight:600;
}
.footer-col ul{list-style:none;margin:0;padding:0;display:grid;gap:11px}
.footer-col a,.footer-col li{color:var(--muted);font-size:13.5px;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-contact li{display:flex;gap:10px;line-height:1.7}
.footer-contact b{color:#cdd8e6;font-weight:500}
.footer-bottom{
  margin-top:56px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  color:#68778a;font-size:12.5px;letter-spacing:.02em;
}

/* ---------- page hero (inner pages) ---------- */
.page-hero{
  position:relative;padding:170px 0 76px;border-bottom:1px solid var(--line);overflow:hidden;
  background:linear-gradient(180deg,#0a0f16 0%,#07090c 100%);
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.025) 0 1px,transparent 1px 9px);
}
.page-hero .wrap{position:relative}
.page-hero h1{font-size:clamp(30px,4vw,52px);letter-spacing:-.025em;margin-bottom:20px}
.page-hero p{color:var(--muted);max-width:620px;font-size:16.5px}
.crumbs{display:flex;gap:10px;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:#6f7f92;margin-bottom:26px}
.crumbs a:hover{color:#fff}
.crumbs span{color:#39434f}

/* ---------- detail blocks ---------- */
.detail{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);background:var(--surface);margin-bottom:26px}
.detail:nth-child(even){direction:rtl}
.detail:nth-child(even)>*{direction:ltr}
.detail-media{position:relative;min-height:340px;overflow:hidden}
.detail-media img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.detail-body{padding:48px 46px}
.detail-body .eyebrow{margin-bottom:14px}
.detail-body h2{font-size:clamp(24px,2.4vw,32px);margin-bottom:16px}
.detail-body p{color:var(--muted);font-size:15px;line-height:1.8}
.spec-list{list-style:none;margin:24px 0 0;padding:0;display:grid;gap:12px}
.spec-list li{display:flex;gap:12px;font-size:14px;color:#b6c3d3;border-top:1px solid var(--line);padding-top:12px}
.spec-list li::before{content:"";width:6px;height:6px;background:var(--accent);flex:none;margin-top:8px;transform:rotate(45deg)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}
.info-list{display:grid;gap:0;border-top:1px solid var(--line)}
.info-item{display:grid;grid-template-columns:120px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.info-item dt{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);padding-top:3px}
.info-item dd{margin:0;font-size:15.5px;line-height:1.7}
.info-item dd a:hover{color:var(--accent)}

form.inquiry{border:1px solid var(--line);background:var(--surface);padding:38px}
.field{margin-bottom:20px}
.field label{display:block;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:9px}
.field input,.field textarea,.field select{
  width:100%;background:#0a0e14;border:1px solid var(--line);color:var(--text);
  padding:13px 15px;font:inherit;font-size:14.5px;border-radius:2px;outline:none;
  transition:border-color .25s,background .25s;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--accent);background:#080c12}
.field textarea{min-height:130px;resize:vertical}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-note{font-size:12.5px;color:#6f7f92;margin-top:14px;line-height:1.7}
.form-ok{
  display:none;border:1px solid rgba(47,123,255,.45);background:var(--accent-soft);
  padding:18px 20px;font-size:14px;line-height:1.7;margin-bottom:22px;
}
.form-ok.show{display:block}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .split{grid-template-columns:1fr;gap:44px}
  .split-media--offset{margin-top:0}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .contact-grid{grid-template-columns:1fr;gap:40px}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .detail-body{padding:38px 34px}
}
@media (max-width:860px){
  .nav{
    position:fixed;top:78px;left:0;right:0;background:rgba(7,9,12,.98);
    border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;
    padding:14px 24px 26px;gap:2px;transform:translateY(-130%);
    transition:transform .45s var(--ease);backdrop-filter:blur(12px);
  }
  body.nav-open .nav{transform:none}
  .nav a{padding:13px 4px;font-size:15px;border-bottom:1px solid rgba(255,255,255,.05)}
  .nav a.is-active::after{display:none}
  .nav-toggle{display:block}
  .header-actions .btn{display:none}
  .hero{padding-top:120px;min-height:auto}
  .hero-stats{grid-template-columns:repeat(2,1fr);margin-top:52px}
  .cards{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr 1fr}
  .news-grid{grid-template-columns:1fr}
  .detail{grid-template-columns:1fr}
  .detail:nth-child(even){direction:ltr}
  .detail-media{min-height:260px;aspect-ratio:16/10}
  .detail-media img{position:relative}
  .stat-row{grid-template-columns:1fr 1fr;gap:20px}
  .section{padding:76px 0}
}
@media (max-width:520px){
  .wrap{padding:0 20px}
  .footer-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr}
  .field-row{grid-template-columns:1fr}
  .brand-sub{display:none}
  .hero-stats strong{font-size:22px}
  form.inquiry{padding:26px 20px}
  .cta-band{padding:72px 0}
}