/* roulang page: index */
:root{
  --brand-furnace:#E1541C;
  --brand-ember:#B73F14;
  --brand-steel:#37626B;
  --ink-900:#0E1113;
  --ink-600:#4A5560;
  --ink-300:#9AA3AB;
  --line:#E3E7EA;
  --bg:#F5F6F7;
  --surface:#FFFFFF;
  --ok:#1F7A55;
  --warn:#C2410C;
  --muted:#6B7681;
  --grad-brand:linear-gradient(135deg,#E1541C 0%,#F0A03C 52%,#B73F14 100%);
  --grad-silver:linear-gradient(160deg,#FFFFFF 0%,#EDF1F3 100%);
  --r-card:18px;
  --r-block:24px;
  --r-btn:12px;
  --sh-1:0 1px 2px rgba(14,17,19,.06);
  --sh-2:0 8px 24px rgba(14,17,19,.08);
  --sh-3:0 16px 40px rgba(225,84,28,.16);
  --shell-w:248px;
  --gap-desktop:88px;
  --gap-tablet:64px;
  --gap-mobile:44px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-600);
  background:var(--bg);
  text-wrap:pretty;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{margin:0 0 16px;color:var(--ink-900);font-weight:700;letter-spacing:0;}
h1{font-size:clamp(30px,4.4vw,52px);line-height:1.18;}
h2{font-size:clamp(24px,2.8vw,36px);line-height:1.25;}
h3{font-size:20px;line-height:1.35;font-weight:600;}
h4{font-size:17px;line-height:1.4;font-weight:600;}
p{margin:0 0 1.15em;}
p:last-child{margin-bottom:0;}
a{color:var(--brand-ember);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--brand-furnace);}
img{max-width:100%;height:auto;display:block;}
ul,ol{margin:0;padding:0;list-style:none;}
button,input,textarea,select{font:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--brand-furnace);outline-offset:2px;}
.grid-x,.cell,.row,.column{min-width:0;}
.row-gap{margin-left:-12px;margin-right:-12px;}
.row-gap>.cell{padding-left:12px;padding-right:12px;}
.shell{display:flex;align-items:flex-start;min-height:100vh;}

/* ================= 左侧 App Shell 导航 ================= */
.side-nav{
  flex:0 0 var(--shell-w);
  width:var(--shell-w);
  position:sticky;
  top:0;
  height:100vh;
  overflow-y:auto;
  background:var(--ink-900);
  background-image:repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 4px);
  color:#fff;
  padding:28px 20px 24px;
  display:flex;
  flex-direction:column;
  gap:28px;
  z-index:50;
}
.side-nav::-webkit-scrollbar{width:6px;}
.side-nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16);border-radius:6px;}
.brand{display:flex;align-items:center;gap:12px;color:#fff;}
.brand:hover{color:#fff;}
.brand-mark{
  flex:0 0 auto;width:40px;height:40px;border-radius:12px;
  background:var(--grad-brand);
  display:flex;align-items:center;justify-content:center;
  font-size:17px;font-weight:800;letter-spacing:.02em;color:#fff;
  box-shadow:0 6px 18px rgba(225,84,28,.32);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{font-size:16px;font-weight:700;color:#fff;letter-spacing:.01em;}
.brand-text em{font-style:normal;font-size:12px;color:var(--ink-300);letter-spacing:.04em;margin-top:2px;}
.nav-block-label{
  font-size:12px;letter-spacing:.06em;color:#6E7A84;text-transform:none;margin:0 0 10px 4px;display:block;
}
.nav-list{display:flex;flex-direction:column;gap:4px;}
.nav-list a{
  display:flex;align-items:center;gap:11px;
  padding:11px 14px;border-radius:10px;
  color:#C6CDD3;font-size:15px;position:relative;
  transition:background .16s ease,color .16s ease;
}
.nav-list a i{font-size:15px;width:20px;text-align:center;color:#7E8993;transition:color .16s ease;}
.nav-list a:hover{background:rgba(255,255,255,.07);color:#fff;}
.nav-list a:hover i{color:var(--brand-furnace);}
.nav-list a.is-active{background:rgba(225,84,28,.14);color:#fff;font-weight:600;}
.nav-list a.is-active i{color:var(--brand-furnace);}
.nav-list a.is-active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:22px;border-radius:2px;background:var(--brand-furnace);
}
.side-cta{
  margin-top:auto;background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.08);
  border-radius:16px;padding:18px 16px;
}
.side-cta p{font-size:13px;color:#9AA3AB;margin:0 0 10px;line-height:1.6;}
.side-cta .phone{display:block;font-size:17px;font-weight:700;color:#fff;letter-spacing:.02em;margin-bottom:12px;font-variant-numeric:tabular-nums;}
.side-cta .phone:hover{color:var(--brand-furnace);}
.btn-side{
  display:flex;align-items:center;justify-content:center;gap:8px;
  height:42px;border-radius:10px;background:var(--grad-brand);color:#fff;
  font-size:14px;font-weight:600;transition:transform .18s ease,box-shadow .18s ease;
}
.btn-side:hover{color:#fff;transform:translateY(-1px);box-shadow:var(--sh-3);}
.btn-side:active{transform:translateY(0);}

/* ================= 移动端顶栏与抽屉 ================= */
.mobile-bar{
  display:none;position:fixed;top:0;left:0;right:0;height:56px;z-index:60;
  background:rgba(14,17,19,.97);align-items:center;justify-content:space-between;
  padding:0 14px;
  background-image:repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 4px);
}
.mobile-bar .brand-mark{width:32px;height:32px;border-radius:9px;font-size:14px;}
.mobile-bar .brand-text strong{font-size:15px;}
.burger{
  width:44px;height:44px;border-radius:10px;border:1px solid rgba(255,255,255,.14);
  background:rgba(255,255,255,.05);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:18px;cursor:pointer;transition:background .16s ease,border-color .16s ease;
}
.burger:hover{background:rgba(225,84,28,.2);border-color:rgba(225,84,28,.4);}
.drawer{
  position:fixed;top:0;left:0;width:280px;max-width:84vw;height:100%;z-index:90;
  background:var(--ink-900);color:#fff;padding:22px 18px;
  transform:translateX(-101%);transition:transform .24s ease;
  overflow-y:auto;display:flex;flex-direction:column;gap:24px;
  background-image:repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 4px);
}
.drawer.is-open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;}
.drawer-close{
  width:40px;height:40px;border-radius:10px;border:1px solid rgba(255,255,255,.14);
  background:transparent;color:#fff;cursor:pointer;font-size:16px;
}
.drawer-mask{
  position:fixed;inset:0;background:rgba(14,17,19,.5);z-index:80;
  opacity:0;visibility:hidden;transition:opacity .24s ease,visibility .24s ease;
}
.drawer-mask.is-open{opacity:1;visibility:visible;}

/* ================= 主内容区 ================= */
.main-area{flex:1 1 auto;min-width:0;padding:32px 48px 0;}
.main-inner{max-width:1240px;margin:0 auto;}
.section{margin-top:var(--gap-desktop);}
.section:first-child{margin-top:0;}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:24px;flex-wrap:wrap;margin-bottom:32px;
}
.section-head h2{margin-bottom:8px;}
.section-head p{margin:0;color:var(--ink-600);font-size:15px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.06em;color:var(--brand-ember);
  background:rgba(225,84,28,.1);border:1px solid rgba(225,84,28,.22);
  border-radius:999px;padding:6px 14px;margin-bottom:16px;line-height:1;
}
.text-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;font-weight:600;color:var(--brand-ember);white-space:nowrap;
}
.text-link i{font-size:13px;transition:transform .18s ease;}
.text-link:hover i{transform:translateX(4px);}

/* ================= Hero ================= */
.hero{
  position:relative;overflow:hidden;
  border-radius:var(--r-block);
  border:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,rgba(14,17,19,.03) 0 1px,transparent 1px 4px),var(--grad-silver);
  padding:56px 48px;
  box-shadow:var(--sh-1);
}
.hero::after{
  content:"";position:absolute;top:-140px;right:-100px;width:460px;height:460px;border-radius:50%;
  background:radial-gradient(circle,rgba(225,84,28,.18) 0%,rgba(225,84,28,0) 70%);
  pointer-events:none;
}
.hero .grid-x{position:relative;z-index:1;}
.hero-copy{max-width:100%;}
.hero h1{margin-bottom:20px;}
.hero-sub{font-size:17px;line-height:1.8;color:var(--ink-600);max-width:32em;margin-bottom:28px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:8px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:50px;padding:0 26px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;cursor:pointer;border:1px solid transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
  white-space:nowrap;
}
.btn i{font-size:13px;}
.btn-primary{background:var(--brand-furnace);color:#fff;box-shadow:0 6px 18px rgba(225,84,28,.22);}
.btn-primary:hover{background:var(--brand-ember);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-3);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:#fff;color:var(--ink-600);border-color:#D6DBDF;}
.btn-ghost:hover{border-color:var(--brand-furnace);color:var(--brand-furnace);transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);}
.btn-sm{height:42px;padding:0 20px;font-size:14px;}
.stat-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px;}
.stat{
  display:flex;align-items:baseline;gap:7px;
  padding:10px 16px;border-radius:999px;
  background:rgba(225,84,28,.1);border:1px solid rgba(225,84,28,.24);
}
.stat b{font-size:26px;font-weight:700;color:var(--brand-furnace);line-height:1;font-variant-numeric:tabular-nums;font-family:"Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;}
.stat span{font-size:12px;color:var(--ink-600);letter-spacing:.02em;}
.hero-figure{
  margin:0;border-radius:var(--r-card);overflow:hidden;
  border:1px solid var(--line);background:var(--grad-silver);
  box-shadow:var(--sh-2);aspect-ratio:4/3;
}
.hero-figure img{width:100%;height:100%;object-fit:cover;}

/* ================= 品牌承诺条 ================= */
.promise{
  border-radius:var(--r-card);background:var(--surface);border:1px solid var(--line);
  padding:22px 8px;box-shadow:var(--sh-1);
}
.promise-item{display:flex;align-items:center;gap:12px;padding:6px 20px;border-left:1px solid var(--line);}
.promise-item:first-child{border-left:none;}
.promise-item i{
  flex:0 0 auto;width:38px;height:38px;border-radius:11px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(55,98,107,.1);color:var(--brand-steel);font-size:15px;
}
.promise-item strong{display:block;font-size:15px;font-weight:600;color:var(--ink-900);line-height:1.4;}
.promise-item em{font-style:normal;font-size:12px;color:var(--ink-300);display:block;letter-spacing:.02em;}

/* ================= 故事 / 理念 ================= */
.story{margin-top:56px;}
.story:first-child{margin-top:0;}
.story-media{
  margin:0;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);
  aspect-ratio:16/11;background:var(--grad-silver);box-shadow:var(--sh-1);
}
.story-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.story-media:hover img{transform:scale(1.03);}
.story-body h3{font-size:24px;margin-bottom:14px;}
.story-quote{
  border-left:3px solid var(--brand-furnace);
  background:#fff;border-radius:0 12px 12px 0;
  padding:14px 18px;margin:20px 0;color:var(--ink-900);font-size:15px;line-height:1.7;
}
.story-stats{display:flex;flex-wrap:wrap;gap:28px;margin-top:22px;}
.story-stats div{border-top:2px solid var(--line);padding-top:12px;min-width:120px;}
.story-stats b{
  display:block;font-size:26px;color:var(--brand-steel);font-weight:700;line-height:1.2;
  font-variant-numeric:tabular-nums;font-family:"Roboto Mono",ui-monospace,Menlo,monospace;
}
.story-stats span{font-size:13px;color:var(--ink-300);}

/* ================= 精选内容 Bento ================= */
.bento-card{
  display:flex;flex-direction:column;position:relative;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;height:100%;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.bento-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad-brand);z-index:2;
}
.bento-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:#D8DEE2;color:inherit;}
.bento-card:hover h3{color:var(--brand-furnace);}
.bento-card:hover .bento-more{color:var(--brand-furnace);}
.bento-media{margin:0;width:100%;overflow:hidden;background:var(--grad-silver);}
.bento-lg .bento-media{aspect-ratio:16/9;}
.bento-sm .bento-media{aspect-ratio:16/7;}
.bento-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.bento-card:hover .bento-media img{transform:scale(1.04);}
.bento-body{padding:24px;display:flex;flex-direction:column;gap:12px;flex:1;}
.bento-lg .bento-body{padding:28px;}
.bento-body h3{margin:0;font-size:19px;line-height:1.45;transition:color .2s ease;}
.bento-lg .bento-body h3{font-size:24px;}
.bento-body p{margin:0;font-size:14.5px;color:var(--ink-600);line-height:1.7;}
.bento-more{
  margin-top:auto;font-size:14px;font-weight:600;color:var(--brand-steel);
  display:inline-flex;align-items:center;gap:7px;transition:color .2s ease;
}
.bento-stack{display:flex;flex-direction:column;gap:24px;height:100%;}
.bento-stack .bento-card{flex:1;}

/* ================= 最新信息（CMS 循环区） ================= */
.cms-grid{margin-top:0;}
.post-card{
  display:flex;flex-direction:column;position:relative;height:100%;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.post-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad-brand);z-index:2;
}
.post-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:#D8DEE2;color:inherit;}
.post-card:hover h3{color:var(--brand-furnace);}
.post-cover{margin:0;aspect-ratio:16/9;overflow:hidden;background:var(--grad-silver);}
.post-cover img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.post-card:hover .post-cover img{transform:scale(1.04);}
.post-body{padding:22px 22px 20px;display:flex;flex-direction:column;gap:12px;flex:1;}
.post-body h3{margin:0;font-size:18px;line-height:1.45;transition:color .2s ease;}
.post-summary{
  margin:0;font-size:14px;color:var(--ink-600);line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
}
.post-tag{
  display:inline-flex;align-items:center;font-size:12px;line-height:1;letter-spacing:.04em;
  color:var(--brand-steel);border:1px solid rgba(55,98,107,.32);border-radius:999px;padding:5px 11px;
}
.post-date{font-size:13px;color:var(--ink-300);font-variant-numeric:tabular-nums;}
.cms-empty{
  width:100%;text-align:center;padding:56px 24px;background:var(--surface);
  border:1px dashed #D6DBDF;border-radius:var(--r-card);
}
.cms-empty i{font-size:30px;color:var(--ink-300);display:block;margin-bottom:14px;}
.cms-empty p{color:var(--muted);font-size:15px;margin-bottom:18px;}

/* ================= 信任背书 ================= */
.trust-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-block);padding:40px;box-shadow:var(--sh-1);}
.logo-wall{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:32px;}
.logo-wall span{
  display:flex;align-items:center;justify-content:center;text-align:center;
  min-height:62px;padding:12px 10px;border:1px solid var(--line);border-radius:12px;
  font-size:13.5px;color:var(--ink-300);background:#FBFCFC;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.logo-wall span:hover{color:var(--brand-furnace);border-color:rgba(225,84,28,.36);background:rgba(225,84,28,.05);}
.testimonial{
  border-left:3px solid var(--brand-furnace);background:var(--bg);
  border-radius:0 14px 14px 0;padding:22px 26px;margin-bottom:28px;
}
.testimonial p{font-size:16px;color:var(--ink-900);line-height:1.8;margin:0 0 12px;}
.testimonial cite{font-style:normal;font-size:13.5px;color:var(--ink-300);}
.trust-stats{display:flex;flex-wrap:wrap;gap:14px;}
.trust-stats .stat{background:rgba(55,98,107,.08);border-color:rgba(55,98,107,.24);}
.trust-stats .stat b{color:var(--brand-steel);}

/* ================= FAQ ================= */
.faq-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-block);padding:12px 40px 20px;box-shadow:var(--sh-1);}
.faq-list.accordion{border:none;background:transparent;margin:0;}
.faq-list .accordion-item{border:none;border-bottom:1px solid var(--line);background:transparent;}
.faq-list .accordion-item:last-child{border-bottom:none;}
.faq-list .accordion-title{
  display:block;position:relative;
  padding:24px 46px 24px 16px;
  font-size:17px;font-weight:600;color:var(--ink-900);
  border:none;background:transparent;line-height:1.5;
  transition:color .18s ease,background .18s ease;
}
.faq-list .accordion-title:hover{color:var(--brand-furnace);background:rgba(225,84,28,.03);}
.faq-list .accordion-title::before{
  content:"+";position:absolute;right:14px;top:50%;transform:translateY(-50%);
  margin:0;font-size:22px;font-weight:400;color:var(--brand-furnace);line-height:1;
  transition:transform .18s ease;
}
.faq-list .accordion-item.is-active .accordion-title{color:var(--brand-furnace);box-shadow:inset 3px 0 0 var(--brand-furnace);}
.faq-list .accordion-item.is-active .accordion-title::before{content:"−";}
.faq-list .accordion-content{
  padding:0 46px 24px 16px;border:none;background:transparent;
  color:var(--ink-600);font-size:15px;line-height:1.8;
}
.faq-list .accordion-content p{margin:0;}

/* ================= CTA + 表单 ================= */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--r-block);
  background:var(--ink-900);
  background-image:
    repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 4px),
    radial-gradient(circle at 88% 12%,rgba(225,84,28,.32) 0%,rgba(225,84,28,0) 58%);
  padding:56px 48px;color:#fff;
}
.cta-band h2{color:#fff;margin-bottom:14px;}
.cta-band .cta-lead{color:#AEB7BD;font-size:15.5px;line-height:1.8;margin-bottom:26px;max-width:34em;}
.cta-points{display:flex;flex-direction:column;gap:14px;margin-bottom:28px;}
.cta-points li{display:flex;align-items:flex-start;gap:12px;font-size:15px;color:#D3D9DD;}
.cta-points i{color:var(--brand-furnace);font-size:15px;margin-top:4px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.26);}
.btn-outline-light:hover{border-color:var(--brand-furnace);color:#fff;background:rgba(225,84,28,.16);}
.form-card{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);
  border-radius:var(--r-card);padding:28px;
}
.form-card h3{color:#fff;font-size:19px;margin-bottom:20px;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:13px;color:#9AA3AB;margin-bottom:8px;letter-spacing:.02em;}
.field input,.field textarea{
  width:100%;border-radius:var(--r-btn);border:1px solid rgba(255,255,255,.18);
  background:rgba(255,255,255,.06);color:#fff;font-size:15px;
  transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
}
.field input{height:48px;padding:0 14px;}
.field textarea{min-height:96px;padding:12px 14px;line-height:1.7;resize:vertical;}
.field input::placeholder,.field textarea::placeholder{color:#7E8993;}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--brand-furnace);background:rgba(255,255,255,.09);
  box-shadow:0 0 0 4px rgba(225,84,28,.18);
}
.check-line{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:#9AA3AB;line-height:1.6;margin:4px 0 22px;}
.check-line input{width:16px;height:16px;margin-top:3px;accent-color:var(--brand-furnace);flex:0 0 auto;}
.form-card .btn{width:100%;}

/* ================= 页脚 ================= */
.site-footer{
  margin-top:var(--gap-desktop);
  background:var(--ink-900);color:#C6CDD3;
  border-radius:var(--r-block) var(--r-block) 0 0;
  padding:56px 48px 0;
  background-image:repeating-linear-gradient(90deg,rgba(255,255,255,.04) 0 1px,transparent 1px 4px);
}
.footer-grid{padding-bottom:40px;}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:18px;letter-spacing:.02em;}
.footer-col p{font-size:14px;color:#98A2AA;line-height:1.8;}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col ul a{font-size:14px;color:#C6CDD3;}
.footer-col ul a:hover{color:var(--brand-furnace);}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:18px;}
.footer-brand .brand-text strong{color:#fff;}
.footer-brand .brand-text em{color:#8C959D;}
.footer-contact li{font-size:14px;color:#C6CDD3;display:flex;gap:10px;line-height:1.7;}
.footer-contact i{color:var(--brand-furnace);margin-top:5px;font-size:14px;}
.footer-phone{font-size:20px;font-weight:700;color:#fff;font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.footer-phone:hover{color:var(--brand-furnace);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:20px 0 24px;display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;font-size:13px;color:#8C959D;
}

/* ================= 响应式 ================= */
@media screen and (max-width:1439px){
  .main-area{padding:32px 40px 0;}
}
@media screen and (max-width:1023px){
  .side-nav{display:none;}
  .mobile-bar{display:flex;}
  .main-area{padding:76px 24px 0;}
  .section{margin-top:var(--gap-tablet);}
  .site-footer{margin-top:var(--gap-tablet);padding:44px 28px 0;border-radius:20px 20px 0 0;}
  .hero{padding:40px 30px;}
  .cta-band{padding:40px 30px;}
  .trust-wrap,.faq-wrap{padding:28px 24px;}
  .faq-wrap{padding:8px 24px 16px;}
  .hero-figure{margin-top:32px;aspect-ratio:16/10;}
  .promise-item{border-left:none;border-top:1px solid var(--line);padding:14px 18px;}
  .promise-item:first-child,.promise-item:nth-child(2){border-top:none;}
  .bento-stack{margin-top:24px;height:auto;}
  .logo-wall{grid-template-columns:repeat(3,minmax(0,1fr));}
  .story{margin-top:40px;}
  .story-media{margin-bottom:24px;}
}
@media screen and (max-width:639px){
  body{font-size:15.5px;}
  .main-area{padding:72px 16px 0;}
  .section{margin-top:var(--gap-mobile);}
  .hero{padding:30px 20px;border-radius:18px;}
  .hero-sub{font-size:15.5px;}
  .hero-actions{gap:10px;}
  .hero-actions .btn{width:100%;}
  .stat-row{gap:8px;margin-top:24px;}
  .stat{padding:8px 13px;}
  .stat b{font-size:22px;}
  .promise{padding:12px 4px;}
  .promise-item{padding:14px 12px;}
  .promise-item:first-child{border-top:none;}
  .story-body h3{font-size:20px;}
  .story-stats{gap:18px;}
  .bento-lg .bento-body h3{font-size:20px;}
  .bento-body{padding:20px;}
  .cta-band{padding:32px 20px;border-radius:18px;}
  .form-card{padding:22px 18px;margin-top:28px;}
  .trust-wrap{border-radius:18px;}
  .faq-wrap{padding:4px 18px 12px;border-radius:18px;}
  .faq-list .accordion-title{padding:20px 40px 20px 8px;font-size:16px;}
  .faq-list .accordion-content{padding:0 40px 20px 8px;}
  .logo-wall{grid-template-columns:repeat(2,minmax(0,1fr));}
  .site-footer{padding:36px 20px 0;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px;}
}
@media screen and (min-width:1440px){
  .row-gap{margin-left:-16px;margin-right:-16px;}
  .row-gap>.cell{padding-left:16px;padding-right:16px;}
}

/* roulang page: category1 */
:root{
  --brand-furnace:#E1541C;
  --brand-ember:#B73F14;
  --brand-steel:#37626B;
  --ink-900:#0E1113;
  --ink-600:#4A5560;
  --ink-300:#9AA3AB;
  --line:#E3E7EA;
  --bg:#F5F6F7;
  --surface:#FFFFFF;
  --ok:#1F7A55;
  --warn:#C2410C;
  --neutral:#6B7681;
  --grad-brand:linear-gradient(135deg,#E1541C 0%,#F0A03C 52%,#B73F14 100%);
  --grad-silver:linear-gradient(160deg,#FFFFFF 0%,#EDF1F3 100%);
  --r-card:18px;
  --r-block:24px;
  --r-btn:12px;
  --sh-1:0 1px 2px rgba(14,17,19,.06);
  --sh-2:0 8px 24px rgba(14,17,19,.08);
  --sh-3:0 16px 40px rgba(225,84,28,.16);
  --sidebar-w:248px;
  --container:1240px;
  --font:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"Roboto Mono","SFMono-Regular",Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-900);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:14px}
a{color:inherit;text-decoration:none;transition:color .16s ease}
a:hover{color:var(--brand-furnace)}
button,input,textarea,select{font-family:inherit;font-size:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
h1{font-size:clamp(30px,4.4vw,52px);line-height:1.18;font-weight:700;letter-spacing:0;text-wrap:pretty}
h2{font-size:clamp(24px,2.8vw,36px);line-height:1.25;font-weight:700;text-wrap:pretty}
h3{font-size:21px;line-height:1.35;font-weight:600}
p{line-height:1.75;text-wrap:pretty}
.num,.mono{font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--brand-furnace);outline-offset:2px;border-radius:6px}

/* ---------- 布局骨架 ---------- */
.app-shell{display:flex;align-items:flex-start;min-height:100vh}
.app-sidebar{
  width:var(--sidebar-w);
  flex:0 0 var(--sidebar-w);
  position:sticky;top:0;
  height:100vh;
  background:var(--surface);
  border-right:1px solid var(--line);
  overflow-y:auto;
  z-index:40;
}
.sidebar-inner{padding:24px 20px 32px;display:flex;flex-direction:column;min-height:100%;gap:24px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{
  width:44px;height:44px;flex:0 0 44px;
  display:flex;align-items:center;justify-content:center;
  border-radius:12px;
  background:var(--grad-brand);
  color:#fff;font-weight:700;letter-spacing:.04em;font-size:17px;
  box-shadow:0 6px 16px rgba(225,84,28,.28);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:16px;font-weight:700}
.brand-text em{font-style:normal;font-size:12px;color:var(--ink-300);letter-spacing:.06em}
.nav-block-label{
  display:block;font-size:12px;letter-spacing:.06em;color:var(--ink-300);
  margin:0 0 10px;padding-left:2px;
}
.nav-list li{margin-bottom:4px}
.nav-list a{
  display:flex;align-items:center;gap:10px;
  padding:11px 12px 11px 12px;
  border-radius:12px;
  font-size:15px;color:var(--ink-600);
  border-left:3px solid transparent;
  position:relative;
}
.nav-list a i{width:20px;font-size:15px;color:var(--ink-300);text-align:center;transition:color .16s ease}
.nav-list a:hover{background:#F2F4F5;color:var(--brand-furnace)}
.nav-list a:hover i{color:var(--brand-furnace)}
.nav-list a.is-active{
  border-left-color:var(--brand-furnace);
  background:rgba(225,84,28,.08);
  color:var(--ink-900);font-weight:700;
}
.nav-list a.is-active i{color:var(--brand-furnace)}
.sidebar-cta{
  margin-top:auto;
  background:var(--ink-900);
  border-radius:var(--r-card);
  padding:20px 18px;
  color:#fff;
  position:relative;overflow:hidden;
}
.sidebar-cta::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.06) 0 1px,transparent 1px 4px);
  opacity:.5;
}
.sidebar-cta h4{font-size:15px;font-weight:700;margin-bottom:8px}
.sidebar-cta p{font-size:13px;color:rgba(255,255,255,.68);line-height:1.7;margin-bottom:14px}
.sidebar-cta .cta-phone{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:16px;font-weight:700;color:#fff;
}
.sidebar-cta .cta-phone:hover{color:#F0A03C}

.app-main{flex:1 1 auto;min-width:0;display:flex;flex-direction:column}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 40px}
.section{padding:88px 0}
.section-tight{padding:56px 0}
.section-head{max-width:720px;margin-bottom:40px}
.section-head .eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.06em;color:var(--brand-steel);
  background:rgba(55,98,107,.08);
  border:1px solid rgba(55,98,107,.2);
  border-radius:999px;padding:5px 12px;margin-bottom:14px;
}
.section-head h2{margin-bottom:12px}
.section-head p{color:var(--ink-600)}

/* ---------- 移动顶栏与抽屉 ---------- */
.mobile-topbar{display:none}
.drawer-mask{display:none}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:26px 0 0;font-size:14px;color:var(--ink-600)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li::after{content:"/";margin-left:8px;color:var(--ink-300)}
.breadcrumb li:last-child::after{content:"";margin:0}
.breadcrumb a{color:var(--ink-600)}
.breadcrumb a:hover{color:var(--brand-furnace)}
.breadcrumb .current{color:var(--ink-900);font-weight:600}

/* ---------- 首屏 ---------- */
.cat-hero{
  margin-top:26px;
  border-radius:var(--r-block);
  background:var(--grad-silver);
  border:1px solid var(--line);
  position:relative;overflow:hidden;
  padding:52px;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:48px;align-items:center;
  box-shadow:var(--sh-1);
}
.cat-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(520px 320px at 92% 8%,rgba(225,84,28,.16),transparent 70%),
    repeating-linear-gradient(90deg,rgba(14,17,19,.04) 0 1px,transparent 1px 5px);
}
.cat-hero > *{position:relative;z-index:1}
.cat-hero h1{margin-bottom:16px}
.cat-hero h1 .hl{color:var(--brand-furnace)}
.cat-hero .hero-lead{font-size:17px;color:var(--ink-600);max-width:56ch;margin-bottom:26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-figure{border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-2);border:1px solid var(--line)}
.hero-figure img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  height:48px;padding:0 22px;
  border-radius:var(--r-btn);
  font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;
  transition:all .18s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--brand-furnace);color:#fff;box-shadow:0 8px 20px rgba(225,84,28,.24)}
.btn-primary:hover{background:var(--brand-ember);color:#fff;transform:translateY(-1px);box-shadow:0 12px 26px rgba(225,84,28,.3)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;color:var(--ink-600);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand-furnace);color:var(--brand-furnace);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0)}
.btn-link{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--brand-furnace);font-weight:600;font-size:15px;
}
.btn-link i{transition:transform .18s ease}
.btn-link:hover i{transform:translateX(4px)}

/* ---------- 数据徽章 ---------- */
.badge-row{display:flex;flex-wrap:wrap;gap:10px}
.badge{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:7px 14px;border-radius:999px;
  background:rgba(225,84,28,.10);
  border:1px solid rgba(225,84,28,.24);
  font-size:13px;color:var(--ink-600);
}
.badge b{
  font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:15px;color:var(--brand-furnace);font-weight:700;
}
.badge .unit{font-size:12px;color:var(--ink-300)}
.badge-steel{background:rgba(55,98,107,.08);border-color:rgba(55,98,107,.22)}
.badge-steel b{color:var(--brand-steel)}

/* ---------- 图文交替 ---------- */
.alt-row{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:56px;align-items:center;
  padding:44px 0;
  border-bottom:1px solid var(--line);
}
.alt-row:last-child{border-bottom:0}
.alt-row.reverse .alt-figure{order:2}
.alt-figure{border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);box-shadow:var(--sh-1);background:var(--grad-silver)}
.alt-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:0;transition:transform .4s ease}
.alt-figure:hover img{transform:scale(1.03)}
.alt-index{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:13px;color:var(--brand-steel);
  letter-spacing:.06em;margin-bottom:12px;
}
.alt-index::before{content:"";width:26px;height:2px;background:var(--brand-furnace);display:block}
.alt-body h3{margin-bottom:12px}
.alt-body p{color:var(--ink-600);margin-bottom:16px}
.alt-list{margin:0 0 20px}
.alt-list li{
  position:relative;padding-left:18px;color:var(--ink-600);font-size:15px;margin-bottom:8px;
}
.alt-list li::before{
  content:"";position:absolute;left:0;top:11px;width:7px;height:7px;border-radius:2px;
  background:var(--brand-furnace);transform:rotate(45deg);
}

/* ---------- 流程条 ---------- */
.flow-strip{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:0;border:1px solid var(--line);border-radius:var(--r-card);
  background:var(--surface);overflow:hidden;box-shadow:var(--sh-1);
}
.flow-step{padding:26px 24px;border-right:1px solid var(--line)}
.flow-step:last-child{border-right:0}
.flow-step .step-no{
  font-family:var(--mono);font-size:13px;color:var(--brand-furnace);
  letter-spacing:.06em;display:block;margin-bottom:10px;
}
.flow-step h4{font-size:17px;font-weight:600;margin-bottom:8px}
.flow-step p{font-size:14px;color:var(--ink-600);line-height:1.7}

/* ---------- 规格对照 ---------- */
.spec-wrap{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-1);
}
.spec-scroll{overflow-x:auto}
.spec-table{min-width:880px;width:100%}
.spec-row{
  display:grid;
  grid-template-columns:1.1fr 1.5fr 1.3fr 1.2fr .9fr;
  gap:16px;padding:16px 26px;
  border-bottom:1px solid var(--line);
  align-items:center;
}
.spec-row:last-child{border-bottom:0}
.spec-row.head{
  background:#F0F2F4;
  font-size:13px;letter-spacing:.06em;color:var(--ink-600);font-weight:600;
}
.spec-row:not(.head):hover{background:#FAFBFB}
.spec-row .cell-name{font-weight:600;display:flex;align-items:center;gap:10px}
.spec-row .cell-name i{color:var(--brand-furnace)}
.spec-row .cell-text{color:var(--ink-600);font-size:14.5px}
.spec-row .cell-num{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:14.5px;color:var(--ink-900)}
.spec-note{margin-top:16px;font-size:13.5px;color:var(--ink-300)}

/* ---------- CTA 区 ---------- */
.cta-block{
  border-radius:var(--r-block);
  background:var(--ink-900);
  color:#fff;
  position:relative;overflow:hidden;
  padding:56px;
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.85fr);
  gap:52px;align-items:center;
}
.cta-block::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 5px),
    radial-gradient(560px 320px at 12% 100%,rgba(225,84,28,.28),transparent 70%);
}
.cta-block > *{position:relative;z-index:1}
.cta-block h2{color:#fff;margin-bottom:14px}
.cta-block p{color:rgba(255,255,255,.72);margin-bottom:22px}
.cta-block .cta-contact{display:flex;flex-direction:column;gap:10px}
.cta-block .cta-contact a,.cta-block .cta-contact span{
  display:flex;align-items:center;gap:10px;font-size:15px;color:rgba(255,255,255,.86);
}
.cta-block .cta-contact i{color:#F0A03C;width:18px;text-align:center}
.cta-form{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--r-card);
  padding:26px;
  backdrop-filter:blur(2px);
}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:rgba(255,255,255,.66);margin-bottom:7px}
.field input,.field textarea{
  width:100%;height:48px;padding:0 14px;
  border-radius:var(--r-btn);
  border:1px solid rgba(255,255,255,.2);
  background:rgba(255,255,255,.06);
  color:#fff;transition:border-color .18s ease,box-shadow .18s ease;
}
.field textarea{height:96px;padding:12px 14px;resize:vertical;line-height:1.6}
.field input::placeholder,.field textarea::placeholder{color:rgba(255,255,255,.34)}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--brand-furnace);
  box-shadow:0 0 0 4px rgba(225,84,28,.18);
}
.check-line{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:rgba(255,255,255,.6);margin-bottom:18px}
.check-line input{width:16px;height:16px;margin-top:4px;accent-color:var(--brand-furnace)}
.check-line a{color:#F0A03C;text-decoration:underline;text-underline-offset:3px}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);margin-top:auto;padding:64px 0 0;position:relative}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.04) 0 1px,transparent 1px 5px);
}
.site-footer > *{position:relative;z-index:1}
.footer-grid{padding-bottom:40px}
.footer-col h4{font-size:15px;color:#fff;font-weight:600;margin-bottom:16px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-mark{width:40px;height:40px;flex:0 0 40px;border-radius:11px}
.footer-brand .brand-text strong{color:#fff;font-size:16px}
.footer-brand .brand-text em{color:rgba(255,255,255,.5)}
.footer-col p{font-size:14px;line-height:1.75}
.footer-col ul li{margin-bottom:10px;font-size:14px}
.footer-col ul a{color:rgba(255,255,255,.72)}
.footer-col ul a:hover{color:var(--brand-furnace)}
.footer-contact li{display:flex;align-items:flex-start;gap:10px}
.footer-contact i{color:var(--brand-furnace);width:18px;text-align:center;margin-top:4px;font-size:13px}
.footer-phone{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:700;color:#fff;font-size:16px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:20px 0 28px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:rgba(255,255,255,.5);
}
.row-gap{row-gap:32px}

/* ---------- 响应式 ---------- */
@media screen and (max-width:1023px){
  .app-sidebar{
    position:fixed;top:0;left:0;height:100vh;width:280px;flex:none;
    transform:translateX(-100%);transition:transform .26s ease;
    box-shadow:0 0 40px rgba(14,17,19,.24);
  }
  .app-sidebar.is-open{transform:translateX(0)}
  .drawer-mask{
    display:block;position:fixed;inset:0;background:rgba(14,17,19,.5);
    opacity:0;visibility:hidden;transition:opacity .24s ease;z-index:35;
  }
  .drawer-mask.is-open{opacity:1;visibility:visible}
  .mobile-topbar{
    display:flex;align-items:center;gap:12px;
    position:sticky;top:0;z-index:30;
    height:56px;padding:0 16px;
    background:rgba(255,255,255,.94);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .nav-toggle{
    width:44px;height:44px;flex:0 0 44px;
    display:flex;align-items:center;justify-content:center;
    background:transparent;border:1px solid var(--line);border-radius:12px;
    color:var(--ink-900);cursor:pointer;
  }
  .nav-toggle:hover{border-color:var(--brand-furnace);color:var(--brand-furnace)}
  .mobile-topbar .brand{margin-right:auto;gap:8px}
  .mobile-topbar .brand-mark{width:34px;height:34px;flex:0 0 34px;font-size:14px;border-radius:10px}
  .mobile-topbar .brand-text strong{font-size:15px}
  .mobile-topbar .brand-text em{display:none}
  .topbar-call{
    width:44px;height:44px;display:flex;align-items:center;justify-content:center;
    border-radius:12px;background:rgba(225,84,28,.1);color:var(--brand-furnace);
  }
  .container{padding:0 24px}
  .section{padding:64px 0}
  .cat-hero{grid-template-columns:1fr;gap:32px;padding:36px}
  .alt-row{grid-template-columns:1fr;gap:28px;padding:36px 0}
  .alt-row.reverse .alt-figure{order:0}
  .flow-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .flow-step:nth-child(2){border-right:0}
  .flow-step:nth-child(1),.flow-step:nth-child(2){border-bottom:1px solid var(--line)}
  .cta-block{grid-template-columns:1fr;gap:32px;padding:36px}
}
@media screen and (max-width:639px){
  body{font-size:15px}
  .container{padding:0 16px}
  .section{padding:44px 0}
  .brand-text strong{font-size:15px}
  .cat-hero{padding:26px;border-radius:20px}
  .cat-hero .hero-lead{font-size:15.5px}
  .hero-actions .btn{width:100%;justify-content:center}
  .flow-strip{grid-template-columns:1fr}
  .flow-step{border-right:0;border-bottom:1px solid var(--line)}
  .flow-step:last-child{border-bottom:0}
  .spec-row{padding:14px 18px;gap:12px}
  .cta-block{padding:26px;border-radius:20px}
  .cta-form{padding:20px}
  .footer-bottom{flex-direction:column;gap:6px}
  .section-head{margin-bottom:28px}
}
@media screen and (min-width:1440px){
  .container{padding:0 56px}
  .grid-margin-x{margin-left:-1rem;margin-right:-1rem}
}

/* roulang page: article */
:root{
  --brand-furnace:#E1541C;
  --brand-ember:#B73F14;
  --brand-steel:#37626B;
  --ink-900:#0E1113;
  --ink-600:#4A5560;
  --ink-300:#9AA3AB;
  --line:#E3E7EA;
  --bg:#F5F6F7;
  --surface:#FFFFFF;
  --success:#1F7A55;
  --warn:#C2410C;
  --empty:#6B7681;
  --grad-brand:linear-gradient(135deg,#E1541C 0%,#F0A03C 52%,#B73F14 100%);
  --grad-silver:linear-gradient(160deg,#FFFFFF 0%,#EDF1F3 100%);
  --shadow-1:0 1px 2px rgba(14,17,19,.06);
  --shadow-2:0 8px 24px rgba(14,17,19,.08);
  --shadow-3:0 16px 40px rgba(225,84,28,.16);
  --r-card:18px;
  --r-block:24px;
  --r-btn:12px;
  --r-pill:999px;
  --sidebar-w:248px;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"Roboto Mono","SFMono-Regular",Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-900);
  background:var(--bg);
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:0;text-wrap:pretty}
p{margin:0;text-wrap:pretty}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
:focus-visible{outline:2px solid var(--brand-furnace);outline-offset:2px;border-radius:4px}
::selection{background:rgba(225,84,28,.18)}

/* ---------- App shell ---------- */
.app-shell{display:flex;min-height:100vh;align-items:stretch}
.sidebar{
  width:var(--sidebar-w);
  flex:0 0 var(--sidebar-w);
  background:var(--surface);
  border-right:1px solid var(--line);
  position:sticky;
  top:0;
  height:100vh;
  overflow-y:auto;
  display:flex;
  flex-direction:column;
  padding:24px 18px 20px;
  z-index:30;
}
.brand{display:flex;align-items:center;gap:12px;padding:4px 6px 20px;border-bottom:1px solid var(--line)}
.brand-mark{
  width:44px;height:44px;flex:0 0 44px;
  display:grid;place-items:center;
  border-radius:14px;
  background:var(--grad-brand);
  color:#fff;font-weight:700;font-size:17px;letter-spacing:.02em;
  box-shadow:0 6px 16px rgba(225,84,28,.28);
  font-family:var(--mono);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:15px;letter-spacing:.01em}
.brand-text em{font-style:normal;font-size:12px;color:var(--ink-300);letter-spacing:.06em}
.nav-block-label{
  display:block;margin:24px 6px 10px;
  font-size:12px;letter-spacing:.06em;color:var(--ink-300);
}
.nav-list{display:flex;flex-direction:column;gap:4px}
.nav-list li{position:relative}
.nav-list a{
  display:flex;align-items:center;gap:10px;
  padding:11px 12px 11px 14px;
  border-radius:10px;
  font-size:15px;
  color:var(--ink-600);
  transition:background .16s ease,color .16s ease;
  position:relative;
}
.nav-list a i{width:20px;text-align:center;font-size:15px;color:var(--ink-300);transition:color .16s ease}
.nav-list a:hover{background:#F1F3F4;color:var(--brand-furnace)}
.nav-list a:hover i{color:var(--brand-furnace)}
.nav-list a.is-active{
  background:rgba(225,84,28,.08);
  color:var(--brand-furnace);
  font-weight:600;
}
.nav-list a.is-active i{color:var(--brand-furnace)}
.nav-list a.is-active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:3px;border-radius:3px;background:var(--brand-furnace);
}
.side-cta{
  margin-top:auto;
  padding:18px 16px;
  border-radius:var(--r-card);
  background:var(--ink-900);
  color:#fff;
  position:relative;
  overflow:hidden;
}
.side-cta::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.06) 0 1px,transparent 1px 4px);
  opacity:.5;pointer-events:none;
}
.side-cta h3{font-size:15px;margin-bottom:6px}
.side-cta p{font-size:13px;color:#C6CDD3;line-height:1.6;margin-bottom:14px}
.side-phone{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:15px;font-weight:600;color:#fff;
  font-variant-numeric:tabular-nums;
}
.side-phone i{color:var(--brand-furnace)}
.side-note{margin-top:10px;font-size:12px;color:#8E979E}

/* ---------- Mobile topbar ---------- */
.mobile-topbar{
  display:none;
  position:fixed;top:0;left:0;right:0;height:56px;z-index:60;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(160%) blur(8px);
  border-bottom:1px solid var(--line);
  align-items:center;justify-content:space-between;
  padding:0 14px;
}
.mobile-topbar .brand{padding:0;border:0;gap:10px}
.mobile-topbar .brand-mark{width:36px;height:36px;flex-basis:36px;border-radius:11px;font-size:14px}
.mobile-topbar .brand-text strong{font-size:14px}
.mobile-topbar .brand-text em{display:none}
.burger{
  width:44px;height:44px;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:12px;color:var(--ink-900);
  background:#fff;
}
.burger i{font-size:17px}
.drawer-mask{
  position:fixed;inset:0;background:rgba(14,17,19,.5);
  opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;z-index:70;
}
.drawer-mask.is-open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;left:0;bottom:0;width:280px;max-width:86vw;z-index:80;
  background:#fff;border-right:1px solid var(--line);
  transform:translateX(-102%);transition:transform .26s ease;
  padding:18px 16px;overflow-y:auto;display:flex;flex-direction:column;
}
.drawer.is-open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.drawer-close{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px;background:#fff}
.drawer .side-cta{margin-top:22px}

/* ---------- Main ---------- */
.app-main{flex:1 1 auto;min-width:0;display:flex;flex-direction:column}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 40px}
.container-narrow{max-width:1120px}
.page-body{padding:32px 0 88px}

/* Breadcrumb */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--ink-300);margin-bottom:22px}
.crumbs a{color:var(--ink-600);transition:color .16s ease}
.crumbs a:hover{color:var(--brand-furnace)}
.crumbs .sep{color:#C7CDD2}
.crumbs .current{color:var(--ink-900);font-weight:600}

/* Article header */
.article-head{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-block);
  padding:34px 38px 30px;
  position:relative;
  overflow:hidden;
  box-shadow:var(--shadow-1);
  margin-bottom:32px;
}
.article-head::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;background:var(--grad-brand);
}
.article-head::after{
  content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(225,84,28,.14) 0%,rgba(225,84,28,0) 68%);
  pointer-events:none;
}
.tag-pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 13px;border-radius:var(--r-pill);
  background:rgba(55,98,107,.08);
  border:1px solid rgba(55,98,107,.28);
  color:var(--brand-steel);
  font-size:12px;letter-spacing:.06em;line-height:1;
}
.tag-pill.is-brand{background:rgba(225,84,28,.10);border-color:rgba(225,84,28,.24);color:var(--brand-ember)}
.article-head h1{
  font-size:clamp(28px,3.4vw,44px);
  line-height:1.2;
  margin:16px 0 18px;
  max-width:900px;
}
.meta-row{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px;
  font-size:14px;color:var(--ink-600);
  position:relative;z-index:1;
}
.meta-row .item{display:inline-flex;align-items:center;gap:7px;font-variant-numeric:tabular-nums}
.meta-row .item i{color:var(--ink-300);font-size:13px}
.meta-row .divider{width:1px;height:14px;background:var(--line)}
.head-visual{
  margin-top:26px;border-radius:14px;overflow:hidden;position:relative;
  aspect-ratio:16/6;
}
.head-visual img{width:100%;height:100%;object-fit:cover}
.head-visual .veil{
  position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(14,17,19,.46) 0%,rgba(14,17,19,.06) 62%);
}
.head-visual .caption{
  position:absolute;left:22px;bottom:18px;color:#fff;
  font-size:13px;letter-spacing:.02em;text-shadow:0 1px 6px rgba(0,0,0,.4);
}

/* Article grid */
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 296px;gap:40px;align-items:start}
.article-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-block);
  padding:42px 48px 46px;
  box-shadow:var(--shadow-1);
  min-width:0;
}

/* Rich text */
.prose{max-width:760px;font-size:16.5px;line-height:1.85;color:#232A2F}
.prose>*+*{margin-top:1.15em}
.prose h2{
  font-size:clamp(21px,2.1vw,26px);line-height:1.35;margin-top:2em;
  padding-left:14px;position:relative;
}
.prose h2::before{
  content:"";position:absolute;left:0;top:.28em;width:4px;height:20px;border-radius:2px;background:var(--brand-furnace);
}
.prose h3{font-size:20px;line-height:1.4;margin-top:1.7em}
.prose p{margin-top:1.05em}
.prose a{color:var(--brand-furnace);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--brand-ember)}
.prose strong{font-weight:700;color:var(--ink-900)}
.prose ul,.prose ol{margin-top:1.05em;padding-left:1.35em}
.prose ul li{list-style:none;position:relative;line-height:1.9;padding-left:2px}
.prose ul li::before{
  content:"";position:absolute;left:-1.05em;top:.75em;width:6px;height:6px;border-radius:2px;
  background:var(--brand-steel);
}
.prose ol{list-style:decimal}
.prose ol li{line-height:1.9;margin-left:.2em}
.prose ol li::marker{color:var(--brand-furnace);font-weight:600}
.prose blockquote{
  border-left:3px solid var(--brand-furnace);
  background:#F7F8F9;
  padding:16px 18px;
  border-radius:0 12px 12px 0;
  color:var(--ink-600);
  font-size:15.5px;
}
.prose img{border-radius:14px;margin-top:1.5em}
.prose figure{margin:1.6em 0 0}
.prose figcaption{font-size:13px;color:var(--ink-300);text-align:center;margin-top:10px}
.prose table{width:100%;border-collapse:collapse;font-size:15px;margin-top:1.4em}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:11px 12px;text-align:left}
.prose th{background:#F7F8F9;font-weight:600;color:var(--ink-600);font-size:14px}
.prose code{
  font-family:var(--mono);font-size:14px;background:#F2F4F5;border:1px solid var(--line);
  padding:1px 6px;border-radius:6px;font-variant-numeric:tabular-nums;
}

/* Empty state */
.empty-state{
  text-align:center;padding:56px 24px;border:1px dashed var(--line);border-radius:var(--r-card);
  background:#FAFBFB;
}
.empty-state .ico{
  width:56px;height:56px;margin:0 auto 16px;border-radius:16px;display:grid;place-items:center;
  background:rgba(225,84,28,.10);color:var(--brand-furnace);font-size:22px;
}
.empty-state h2{font-size:20px;margin-bottom:8px}
.empty-state p{color:var(--ink-600);font-size:15px;margin-bottom:20px}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;
  transition:transform .16s ease,background .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--brand-furnace);color:#fff;box-shadow:0 6px 16px rgba(225,84,28,.22)}
.btn-primary:hover{background:var(--brand-ember);transform:translateY(-1px);box-shadow:var(--shadow-3)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;color:var(--ink-600);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand-furnace);color:var(--brand-furnace);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0)}
.btn-link{
  display:inline-flex;align-items:center;gap:8px;color:var(--brand-furnace);font-weight:600;font-size:15px;
  transition:gap .16s ease,color .16s ease;
}
.btn-link i{font-size:14px}
.btn-link:hover{gap:12px;color:var(--brand-ember)}

/* Tags */
.tag-block{margin-top:44px;padding-top:28px;border-top:1px solid var(--line);max-width:760px}
.tag-block h3{font-size:15px;color:var(--ink-600);margin-bottom:14px;font-weight:600}
.tag-set{display:flex;flex-wrap:wrap;gap:10px}
.tag-set a{
  display:inline-flex;align-items:center;padding:7px 14px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:#fff;font-size:13px;color:var(--ink-600);
  transition:border-color .16s ease,color .16s ease,background .16s ease;
}
.tag-set a:hover{border-color:rgba(225,84,28,.4);color:var(--brand-furnace);background:rgba(225,84,28,.05)}

/* Prev / next */
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:34px}
.pn-card{
  display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px 24px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.pn-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:rgba(225,84,28,.3)}
.pn-card .label{font-size:12px;letter-spacing:.06em;color:var(--ink-300);display:flex;align-items:center;gap:7px}
.pn-card h4{font-size:17px;margin:10px 0 8px;line-height:1.45}
.pn-card:hover h4{color:var(--brand-furnace)}
.pn-card p{font-size:14px;color:var(--ink-600);line-height:1.65}
.pn-card .go{margin-top:14px;display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--brand-steel);font-weight:600}

/* Related */
.section{margin-top:64px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}
.section-head h2{font-size:clamp(20px,2.2vw,26px)}
.section-head .eyebrow{font-size:12px;letter-spacing:.06em;color:var(--brand-steel);display:block;margin-bottom:8px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  position:relative;transition:transform .18s ease,box-shadow .18s ease,color .18s ease;
  box-shadow:var(--shadow-1);
}
.card::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad-brand);z-index:2}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2)}
.card:hover h3{color:var(--brand-furnace)}
.card-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--grad-silver);border-radius:0}
.card-thumb img{width:100%;height:100%;object-fit:cover}
.card-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:17px;line-height:1.45;margin-bottom:10px;transition:color .18s ease}
.card-body p{font-size:14px;color:var(--ink-600);line-height:1.68;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-foot{
  margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--ink-300);font-variant-numeric:tabular-nums;
}
.mini-pill{
  display:inline-flex;align-items:center;padding:4px 11px;border-radius:var(--r-pill);
  border:1px solid rgba(55,98,107,.3);color:var(--brand-steel);font-size:12px;letter-spacing:.04em;line-height:1.4;
}

/* Back band */
.back-band{
  margin-top:56px;border-radius:var(--r-block);overflow:hidden;position:relative;
  background:var(--ink-900);color:#fff;padding:40px 44px;
}
.back-band::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.06) 0 1px,transparent 1px 4px);
  opacity:.55;pointer-events:none;
}
.back-band .glow{
  position:absolute;right:-70px;bottom:-110px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(225,84,28,.4) 0%,rgba(225,84,28,0) 70%);
}
.back-band-inner{position:relative;z-index:1;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px}
.back-band h2{font-size:clamp(20px,2.4vw,28px);margin-bottom:8px}
.back-band p{color:#C6CDD3;font-size:15px;max-width:560px}

/* Sticky rail */
.rail{position:sticky;top:28px;display:flex;flex-direction:column;gap:18px}
.rail-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;box-shadow:var(--shadow-1);
}
.rail-card h3{font-size:15px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.rail-card h3 i{color:var(--brand-furnace);font-size:14px}
.rail-list{display:flex;flex-direction:column;gap:2px}
.rail-list a{
  display:flex;align-items:flex-start;gap:10px;padding:9px 10px;border-radius:10px;
  font-size:14px;color:var(--ink-600);line-height:1.55;
  transition:background .16s ease,color .16s ease;
}
.rail-list a:hover{background:#F4F6F7;color:var(--brand-furnace)}
.rail-list a i{font-size:11px;color:var(--brand-steel);margin-top:7px}
.rail-cta{background:var(--ink-900);color:#fff;position:relative;overflow:hidden}
.rail-cta::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.06) 0 1px,transparent 1px 4px);
  opacity:.5;pointer-events:none;
}
.rail-cta h3{color:#fff;position:relative;z-index:1}
.rail-cta p{position:relative;z-index:1;color:#B9C1C7;font-size:13.5px;line-height:1.65;margin-bottom:16px}
.rail-cta .btn{position:relative;z-index:1;width:100%}
.rail-data{display:flex;flex-direction:column;gap:12px;margin-top:4px}
.rail-data .row{display:flex;align-items:baseline;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--line);padding-bottom:10px}
.rail-data .row:last-child{border-bottom:0;padding-bottom:0}
.rail-data .k{font-size:13px;color:var(--ink-300)}
.rail-data .v{font-family:var(--mono);font-size:15px;font-weight:600;color:var(--brand-furnace);font-variant-numeric:tabular-nums}

/* Footer */
.site-footer{margin-top:auto;background:var(--ink-900);color:#D7DDE1;position:relative;overflow:hidden}
.site-footer::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 4px);
  opacity:.5;pointer-events:none;
}
.footer-grid{position:relative;z-index:1;padding:60px 40px 44px;max-width:1240px;margin:0 auto;row-gap:32px}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px}
.footer-col p{font-size:14px;line-height:1.75;color:#A7B0B7}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand .brand-mark{box-shadow:none}
.footer-brand .brand-text strong{color:#fff;font-size:15px}
.footer-brand .brand-text em{color:#8E979E}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col ul a{font-size:14px;color:#C6CDD3;transition:color .16s ease}
.footer-col ul a:hover{color:var(--brand-furnace)}
.footer-contact li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:#C6CDD3;line-height:1.6}
.footer-contact i{color:var(--brand-furnace);margin-top:5px;font-size:13px}
.footer-phone{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:600;color:#fff}
.footer-phone:hover{color:var(--brand-furnace)}
.footer-bottom{
  position:relative;z-index:1;
  border-top:1px solid rgba(255,255,255,.1);
  max-width:1240px;margin:0 auto;
  padding:18px 40px 26px;
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:#8E979E;
}

/* Reveal helper */
.fade-up{animation:fadeUp .5s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* ---------- Responsive ---------- */
@media screen and (max-width:1399px){
  .article-grid{grid-template-columns:minmax(0,1fr) 276px;gap:32px}
}
@media screen and (max-width:1199px){
  .article-grid{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;flex-direction:row;flex-wrap:wrap}
  .rail-card{flex:1 1 300px}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media screen and (max-width:1023px){
  .sidebar{display:none}
  .mobile-topbar{display:flex}
  .container{padding:0 24px}
  .page-body{padding:24px 0 64px;padding-top:80px}
  .article-panel{padding:32px 30px 36px}
  .article-head{padding:28px 26px 24px;border-radius:var(--r-card)}
  .footer-grid{padding:48px 24px 36px}
  .footer-bottom{padding:16px 24px 24px}
  .back-band{padding:32px 28px}
}
@media screen and (max-width:767px){
  .container{padding:0 18px}
  .related-grid{grid-template-columns:minmax(0,1fr)}
  .prevnext{grid-template-columns:minmax(0,1fr)}
  .prose{font-size:16px}
  .article-panel{padding:24px 20px 28px}
  .article-head h1{font-size:clamp(22px,6.4vw,30px)}
  .head-visual{aspect-ratio:16/9}
  .rail{flex-direction:column}
  .rail-card{flex:1 1 auto}
  .section{margin-top:48px}
}
@media screen and (max-width:520px){
  .meta-row{gap:10px;font-size:13px}
  .meta-row .divider{display:none}
  .back-band-inner{flex-direction:column;align-items:flex-start}
  .section-head{flex-direction:column;align-items:flex-start;gap:10px}
}

/* roulang page: category2 */
:root{
  --brand-furnace:#E1541C;
  --brand-ember:#B73F14;
  --brand-glow:#F0A03C;
  --brand-steel:#37626B;
  --ink-900:#0E1113;
  --ink-600:#4A5560;
  --ink-300:#9AA3AB;
  --line:#E3E7EA;
  --bg:#F5F6F7;
  --surface:#FFFFFF;
  --ok:#1F7A55;
  --warn:#C2410C;
  --radius-card:18px;
  --radius-block:24px;
  --radius-btn:12px;
  --radius-pill:999px;
  --sh-1:0 1px 2px rgba(14,17,19,.06);
  --sh-2:0 8px 24px rgba(14,17,19,.08);
  --sh-3:0 16px 40px rgba(225,84,28,.16);
  --grad-brand:linear-gradient(135deg,#E1541C 0%,#F0A03C 52%,#B73F14 100%);
  --grad-steel:linear-gradient(160deg,#FFFFFF 0%,#EDF1F3 100%);
  --sidebar-w:248px;
  --sec:88px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-900);
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:14px;}
a{color:var(--brand-furnace);text-decoration:none;transition:color .16s ease,border-color .16s ease,background-color .16s ease;}
a:hover{color:var(--brand-ember);}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{
  outline:2px solid var(--brand-furnace);
  outline-offset:2px;
  border-radius:4px;
}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;letter-spacing:0;text-wrap:pretty;}
p{margin:0 0 1.15em;text-wrap:pretty;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;cursor:pointer;}
.num,.data-badge b,.stat b,.spec-cell{font-variant-numeric:tabular-nums;}

/* ---------- App shell ---------- */
.app-shell{display:flex;align-items:flex-start;min-height:100vh;}

.sidebar{
  position:sticky;top:0;
  width:var(--sidebar-w);
  flex:0 0 var(--sidebar-w);
  height:100vh;
  overflow-y:auto;
  background:var(--surface);
  border-right:1px solid var(--line);
  padding:28px 20px 24px;
  display:flex;
  flex-direction:column;
  gap:24px;
  z-index:60;
}
.sidebar-brand{display:flex;align-items:center;gap:12px;text-decoration:none;}
.brand-mark{
  width:46px;height:46px;flex:0 0 46px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:12px;
  background:var(--grad-brand);
  color:#fff;font-weight:700;font-size:18px;letter-spacing:.02em;
  box-shadow:0 6px 16px rgba(225,84,28,.28);
}
.brand-text{display:flex;flex-direction:column;line-height:1.3;}
.brand-text strong{font-size:16px;color:var(--ink-900);font-weight:700;}
.brand-text em{font-style:normal;font-size:12px;color:var(--ink-300);letter-spacing:.06em;}

.nav-block-label{
  display:block;font-size:12px;letter-spacing:.06em;color:var(--ink-300);
  padding:0 10px 10px;border-bottom:1px solid var(--line);
}
.nav-list{display:flex;flex-direction:column;gap:4px;margin-top:14px;}
.nav-list a{
  position:relative;
  display:flex;align-items:center;gap:10px;
  padding:11px 12px;
  border-radius:10px;
  color:var(--ink-600);
  font-size:15px;font-weight:500;
  transition:background-color .16s ease,color .16s ease;
}
.nav-list a i{font-size:15px;width:20px;text-align:center;color:var(--ink-300);transition:color .16s ease;}
.nav-list a:hover{background:#F3F5F6;color:var(--brand-furnace);}
.nav-list a:hover i{color:var(--brand-furnace);}
.nav-list a.is-active{
  background:rgba(225,84,28,.08);
  color:var(--brand-furnace);
  font-weight:700;
}
.nav-list a.is-active i{color:var(--brand-furnace);}
.nav-list a.is-active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:3px;border-radius:2px;background:var(--brand-furnace);
}
.sidebar-foot{margin-top:auto;display:flex;flex-direction:column;gap:12px;}
.side-cta{
  background:var(--ink-900);
  border-radius:16px;
  padding:20px 18px;
  color:#fff;
  position:relative;overflow:hidden;
}
.side-cta::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 7px);
  opacity:.6;pointer-events:none;
}
.side-cta h3{font-size:15px;color:#fff;margin-bottom:6px;position:relative;z-index:1;}
.side-cta p{font-size:13px;color:#A9B2B9;line-height:1.6;margin-bottom:14px;position:relative;z-index:1;}
.side-cta .side-btn{
  position:relative;z-index:1;
  display:inline-flex;align-items:center;gap:8px;
  background:var(--grad-brand);color:#fff;
  padding:10px 16px;border-radius:var(--radius-btn);
  font-size:14px;font-weight:600;
}
.side-cta .side-btn:hover{color:#fff;transform:translateY(-1px);box-shadow:var(--sh-3);}
.side-phone{
  display:flex;align-items:center;gap:10px;
  padding:12px 14px;border:1px solid var(--line);border-radius:12px;
  color:var(--ink-600);font-size:14px;font-weight:600;background:var(--surface);
}
.side-phone i{color:var(--brand-furnace);}
.side-phone:hover{border-color:rgba(225,84,28,.4);color:var(--brand-furnace);}

.mobile-bar{display:none;}
.drawer-mask{display:none;}
.drawer-close{display:none;}

/* ---------- Main ---------- */
.app-main{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;}
.wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 48px;}
.sec{margin-top:var(--sec);}

.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;color:var(--ink-300);
  padding-top:36px;
}
.crumb a{color:var(--ink-600);}
.crumb a:hover{color:var(--brand-furnace);}
.crumb .sep{color:#C7CDD2;}
.crumb .current{color:var(--ink-900);font-weight:600;}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  margin-top:22px;
  border-radius:var(--radius-block);
  background:var(--grad-steel);
  border:1px solid var(--line);
  padding:52px 48px 46px;
  box-shadow:var(--sh-1);
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(14,17,19,.05) 0 1px,transparent 1px 7px);
  opacity:.55;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;right:-90px;top:-130px;width:440px;height:440px;border-radius:50%;
  background:radial-gradient(circle,rgba(225,84,28,.18),transparent 68%);
  pointer-events:none;
}
.hero>*{position:relative;z-index:1;}
.hero-inner{max-width:60%;}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:var(--radius-pill);
  background:rgba(55,98,107,.10);
  border:1px solid rgba(55,98,107,.24);
  color:var(--brand-steel);
  font-size:12px;letter-spacing:.06em;font-weight:600;
  margin-bottom:18px;
}
.hero h1{
  font-size:clamp(30px,4.4vw,50px);
  line-height:1.18;
  font-weight:700;
  margin-bottom:18px;
}
.hero h1 span{color:var(--brand-furnace);}
.hero-lead{
  font-size:17px;color:var(--ink-600);line-height:1.8;
  max-width:52ch;margin-bottom:26px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:30px;}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn-primary{background:var(--brand-furnace);color:#fff;box-shadow:0 6px 16px rgba(225,84,28,.24);}
.btn-primary:hover{background:var(--brand-ember);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-3);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:#fff;color:var(--ink-600);border-color:#CFD6DA;}
.btn-ghost:hover{border-color:var(--brand-furnace);color:var(--brand-furnace);transform:translateY(-1px);}
.btn-link{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--brand-furnace);font-weight:600;font-size:15px;padding:13px 4px;
}
.btn-link i{transition:transform .16s ease;}
.btn-link:hover i{transform:translateX(4px);}

.badge-row{display:flex;flex-wrap:wrap;gap:12px;}
.data-badge{
  display:inline-flex;align-items:center;gap:10px;
  padding:10px 18px;border-radius:var(--radius-pill);
  background:rgba(225,84,28,.10);
  border:1px solid rgba(225,84,28,.24);
}
.data-badge b{font-size:24px;color:var(--brand-furnace);font-weight:700;line-height:1;}
.data-badge b small{font-size:13px;font-weight:600;margin-left:2px;}
.data-badge span{font-size:12px;color:var(--ink-600);letter-spacing:.02em;}

/* ---------- Section heading ---------- */
.sec-head{margin-bottom:32px;max-width:760px;}
.sec-eyebrow{
  display:inline-block;font-size:12px;letter-spacing:.06em;color:var(--brand-furnace);
  font-weight:700;margin-bottom:10px;
}
.sec-head h2{font-size:clamp(24px,2.8vw,34px);margin-bottom:12px;}
.sec-head p{color:var(--ink-600);font-size:16px;margin:0;}

/* ---------- Data cards ---------- */
.data-grid{row-gap:24px;}
.data-card{
  position:relative;
  height:100%;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px 22px 22px;
  box-shadow:var(--sh-1);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
  overflow:hidden;
}
.data-card::before{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad-brand);
}
.data-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:#D6DCE0;}
.data-card .card-label{
  display:inline-block;font-size:12px;letter-spacing:.06em;color:var(--brand-steel);
  border:1px solid rgba(55,98,107,.28);
  border-radius:var(--radius-pill);
  padding:4px 10px;margin-bottom:14px;
}
.data-card .card-value{
  font-size:26px;font-weight:700;color:var(--ink-900);
  line-height:1.2;margin-bottom:8px;
  font-variant-numeric:tabular-nums;
}
.data-card .card-value em{font-style:normal;color:var(--brand-furnace);}
.data-card h3{font-size:16px;font-weight:600;margin-bottom:8px;color:var(--ink-900);}
.data-card p{font-size:14px;color:var(--ink-600);line-height:1.7;margin:0;}
.data-card .card-line{
  margin-top:14px;padding-top:12px;border-top:1px solid var(--line);
  font-size:13px;color:var(--ink-300);
}

/* ---------- Feature strip ---------- */
.strip{
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:0;
  border-radius:var(--radius-block);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--surface);
  box-shadow:var(--sh-1);
}
.strip-media{position:relative;min-height:340px;}
.strip-media img{width:100%;height:100%;object-fit:cover;border-radius:0;aspect-ratio:4/3;}
.strip-body{padding:44px 44px 40px;background:var(--surface);}
.strip-body h2{font-size:clamp(22px,2.4vw,30px);margin-bottom:14px;}
.strip-body > p{color:var(--ink-600);font-size:15.5px;}
.strip-list{margin-top:22px;display:flex;flex-direction:column;gap:0;}
.strip-list li{
  display:flex;gap:14px;align-items:flex-start;
  padding:14px 0;border-top:1px solid var(--line);
  font-size:15px;color:var(--ink-600);
}
.strip-list li:last-child{border-bottom:1px solid var(--line);}
.strip-list i{color:var(--brand-furnace);margin-top:6px;font-size:14px;}
.strip-list strong{color:var(--ink-900);font-weight:600;margin-right:6px;}

/* ---------- Spec table ---------- */
.spec-wrap{
  border:1px solid var(--line);
  border-radius:var(--radius-block);
  background:var(--surface);
  box-shadow:var(--sh-1);
  overflow:hidden;
}
.spec-scroll{overflow-x:auto;}
.spec-row{
  display:grid;
  grid-template-columns:1.1fr 1.5fr 1.1fr 1.5fr 1fr;
  min-width:860px;
  align-items:center;
  padding:0 28px;
}
.spec-row + .spec-row{border-top:1px solid var(--line);}
.spec-head{
  background:#F7F9FA;
  color:var(--ink-600);
  font-size:13px;font-weight:700;letter-spacing:.06em;
  padding-top:16px;padding-bottom:16px;
}
.spec-cell{padding-top:20px;padding-bottom:20px;font-size:15px;color:var(--ink-600);}
.spec-cell{font-variant-numeric:tabular-nums;}
.spec-cell:first-child{color:var(--ink-900);font-weight:600;}
.spec-cell .steel-tag{
  display:inline-block;font-size:12px;color:var(--brand-steel);
  border:1px solid rgba(55,98,107,.26);border-radius:var(--radius-pill);
  padding:3px 10px;
}
.spec-note{
  padding:18px 28px;background:#F7F9FA;border-top:1px solid var(--line);
  font-size:13.5px;color:var(--ink-600);
}

/* ---------- Flow ---------- */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;}
.flow-item{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px 20px;
  box-shadow:var(--sh-1);
  transition:transform .18s ease,box-shadow .18s ease;
}
.flow-item:hover{transform:translateY(-2px);box-shadow:var(--sh-2);}
.flow-item .flow-no{
  font-size:13px;font-weight:700;color:var(--brand-furnace);letter-spacing:.06em;
  display:block;margin-bottom:12px;
}
.flow-item h3{font-size:16px;margin-bottom:8px;}
.flow-item p{font-size:13.5px;color:var(--ink-600);margin:0;line-height:1.7;}

/* ---------- FAQ ---------- */
.faq-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-block);
  padding:12px 30px;
  box-shadow:var(--sh-1);
}
.faq-accordion{margin:0;}
.faq-accordion .accordion-item{border-bottom:1px solid var(--line);position:relative;}
.faq-accordion .accordion-item:last-child{border-bottom:0;}
.faq-accordion .accordion-item::before{
  content:"";position:absolute;left:-30px;top:26px;bottom:auto;width:3px;height:0;
  background:var(--brand-furnace);border-radius:2px;
  transition:height .18s ease;
}
.faq-accordion .accordion-item.is-active::before{height:20px;}
.faq-accordion .accordion-title{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 0;font-size:17px;font-weight:600;color:var(--ink-900);
  border:0;
}
.faq-accordion .accordion-title:hover{color:var(--brand-furnace);}
.faq-accordion .accordion-title::after{
  content:"+";font-size:20px;font-weight:400;color:var(--brand-furnace);
  line-height:1;transition:transform .18s ease;flex:0 0 auto;
}
.faq-accordion .accordion-item.is-active .accordion-title{color:var(--brand-furnace);}
.faq-accordion .accordion-item.is-active .accordion-title::after{content:"−";transform:rotate(180deg);}
.faq-accordion .accordion-content{
  display:none;padding:0 0 22px;font-size:15px;color:var(--ink-600);line-height:1.8;
}
.faq-accordion .accordion-item.is-active .accordion-content{display:block;}
.faq-accordion .accordion-content p{margin:0;}

/* ---------- CTA ---------- */
.cta-block{
  position:relative;overflow:hidden;
  border-radius:var(--radius-block);
  background:
    linear-gradient(135deg,rgba(14,17,19,.94) 0%,rgba(14,17,19,.88) 55%,rgba(183,63,20,.82) 100%),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  padding:52px 48px;
  color:#fff;
}
.cta-block::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 8px);
  opacity:.5;pointer-events:none;
}
.cta-inner{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:52px;}
.cta-copy h2{font-size:clamp(24px,2.8vw,34px);color:#fff;margin-bottom:14px;}
.cta-copy p{color:#B8C0C6;font-size:15.5px;line-height:1.8;margin-bottom:22px;}
.cta-points{display:flex;flex-direction:column;gap:10px;}
.cta-points li{display:flex;align-items:center;gap:10px;font-size:14.5px;color:#D5DBDF;}
.cta-points i{color:var(--brand-glow);font-size:13px;}

.form-card{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius-card);
  padding:26px 24px;
  backdrop-filter:none;
}
.form-card h3{font-size:17px;color:#fff;margin-bottom:6px;}
.form-card > p{font-size:13px;color:#A9B2B9;margin-bottom:18px;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:13px;color:#C3CAD0;margin-bottom:7px;}
.field input,.field textarea{
  width:100%;height:48px;padding:0 14px;
  background:#fff;border:1px solid #D6DCE0;border-radius:var(--radius-btn);
  font-size:15px;color:var(--ink-900);font-family:inherit;
  transition:border-color .16s ease,box-shadow .16s ease;
}
.field textarea{height:96px;padding:12px 14px;resize:vertical;line-height:1.6;}
.field input::placeholder,.field textarea::placeholder{color:#A6AEB5;}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--brand-furnace);box-shadow:0 0 0 4px rgba(225,84,28,.16);
}
.check-row{display:flex;align-items:flex-start;gap:10px;margin:4px 0 18px;}
.check-row input{width:18px;height:18px;margin-top:3px;accent-color:var(--brand-furnace);}
.check-row label{font-size:12.5px;color:#A9B2B9;line-height:1.6;margin:0;}
.form-card .btn-primary{width:100%;justify-content:center;}
.form-tip{margin-top:12px;font-size:12.5px;color:#8E979E;text-align:center;}

/* ---------- Footer ---------- */
.site-footer{
  margin-top:var(--sec);
  background:var(--ink-900);
  color:#B8C0C6;
  padding:64px 48px 0;
  position:relative;
}
.site-footer::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.04) 0 1px,transparent 1px 8px);
  opacity:.7;pointer-events:none;
}
.site-footer > *{position:relative;z-index:1;}
.footer-grid{max-width:1240px;margin:0 auto;row-gap:36px;}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600;}
.footer-col p{font-size:14px;line-height:1.8;color:#9AA3AB;margin:14px 0 0;}
.footer-brand{display:flex;align-items:center;gap:12px;}
.footer-brand .brand-mark{width:44px;height:44px;flex:0 0 44px;font-size:17px;}
.footer-brand .brand-text strong{color:#fff;font-size:16px;}
.footer-brand .brand-text em{color:#8E979E;font-style:normal;font-size:12px;}
.footer-col ul li{margin-bottom:10px;}
.footer-col ul a{color:#B8C0C6;font-size:14px;}
.footer-col ul a:hover{color:var(--brand-furnace);}
.footer-contact li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:#B8C0C6;}
.footer-contact i{color:var(--brand-furnace);margin-top:5px;font-size:13px;}
.footer-phone{color:#fff;font-weight:600;}
.footer-phone:hover{color:var(--brand-furnace);}
.footer-bottom{
  max-width:1240px;margin:48px auto 0;
  padding:22px 0 28px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:#8E979E;
}

/* ---------- Breakpoints ---------- */
@media screen and (max-width:1439px){
  .wrap{padding:0 40px;}
  .sec{--sec:80px;}
}
@media screen and (max-width:1023px){
  :root{--sec:64px;}
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;height:100%;
    transform:translateX(-100%);
    transition:transform .22s ease;
    box-shadow:0 0 40px rgba(14,17,19,.24);
    width:280px;flex-basis:280px;
  }
  .sidebar.is-open{transform:translateX(0);}
  .drawer-close{
    display:inline-flex;align-items:center;justify-content:center;
    position:absolute;right:14px;top:20px;
    width:36px;height:36px;border-radius:10px;
    border:1px solid var(--line);background:#fff;color:var(--ink-600);
  }
  .drawer-close:hover{color:var(--brand-furnace);border-color:rgba(225,84,28,.4);}
  .drawer-mask{
    display:block;position:fixed;inset:0;background:rgba(14,17,19,.5);
    opacity:0;pointer-events:none;transition:opacity .22s ease;z-index:55;
  }
  .drawer-mask.is-open{opacity:1;pointer-events:auto;}
  .mobile-bar{
    display:flex;align-items:center;justify-content:space-between;
    position:fixed;top:0;left:0;right:0;height:56px;padding:0 16px;
    background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);
    z-index:50;
  }
  .mobile-bar .brand-mark{width:36px;height:36px;flex:0 0 36px;font-size:14px;border-radius:10px;}
  .mobile-bar .brand-text strong{font-size:14px;}
  .mobile-bar .brand-text em{display:none;}
  .hamburger{
    width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;
    border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink-900);
    font-size:16px;
  }
  .hamburger:hover{color:var(--brand-furnace);border-color:rgba(225,84,28,.4);}
  .app-main{padding-top:56px;}
  .wrap{padding:0 28px;}
  .hero{padding:40px 28px 34px;}
  .hero-inner{max-width:100%;}
  .hero::after{width:280px;height:280px;right:-100px;top:-110px;}
  .strip{grid-template-columns:1fr;}
  .strip-media{min-height:240px;}
  .strip-media img{aspect-ratio:16/9;}
  .strip-body{padding:32px 28px 30px;}
  .flow{grid-template-columns:repeat(2,1fr);}
  .cta-block{padding:40px 28px;}
  .cta-inner{grid-template-columns:1fr;gap:34px;}
  .faq-panel{padding:8px 24px;}
  .faq-accordion .accordion-item::before{left:-24px;}
  .site-footer{padding:52px 28px 0;}
  .footer-bottom{margin-top:36px;}
}
@media screen and (max-width:639px){
  :root{--sec:44px;}
  body{font-size:15.5px;}
  .wrap{padding:0 18px;}
  .crumb{padding-top:20px;font-size:13px;}
  .hero{margin-top:16px;padding:32px 20px 28px;border-radius:20px;}
  .hero h1{font-size:clamp(26px,7.4vw,34px);}
  .hero-lead{font-size:15.5px;}
  .hero-actions{gap:10px;}
  .btn{width:100%;justify-content:center;padding:14px 18px;}
  .btn-link{width:100%;justify-content:center;}
  .badge-row{gap:10px;}
  .data-badge{padding:9px 14px;flex:1 1 calc(50% - 10px);justify-content:flex-start;}
  .data-badge b{font-size:20px;}
  .sec-head{margin-bottom:22px;}
  .data-card{padding:20px 18px;}
  .data-card .card-value{font-size:22px;}
  .spec-row{padding:0 16px;min-width:760px;}
  .spec-note{padding:14px 16px;}
  .flow{grid-template-columns:1fr;gap:14px;}
  .faq-panel{padding:6px 18px;border-radius:20px;}
  .faq-accordion .accordion-item::before{left:-18px;}
  .faq-accordion .accordion-title{font-size:15.5px;padding:18px 0;}
  .faq-accordion .accordion-content{font-size:14.5px;}
  .cta-block{padding:32px 20px;border-radius:20px;}
  .site-footer{padding:44px 18px 0;}
  .footer-bottom{flex-direction:column;gap:6px;font-size:12.5px;}
}