/* ==================================================================
   chuangwei-br12 · Blueprint Revolution (design #12, lyguohan series)
   色板（锁定）：#001E3C 背景 / #FFFFFF 主色 / #FFD700 强调 / #E0E8F0 正文 / #7A9BB5 次要
   字形：衬线标题（Georgia 栈）/ IBM Plex Sans 正文 / 等宽标注（Consolas 栈）
   圆角：0px（纯工程制图）
   结构铁律：本主题只做视觉换装——chuangwei-en 的 DOM 与全部 SEO 资产逐字节保留；
   无任何默认隐藏内容（no-JS 下降级为静态绘制态）。
   ================================================================== */
:root{
  --bg:#001E3C;
  --white:#FFFFFF;
  --accent:#FFD700;
  --text:#E0E8F0;
  --muted:#7A9BB5;

  --ink-deep:#001227;
  --line-1:rgba(255,255,255,.10);
  --line-2:rgba(255,255,255,.20);
  --line-3:rgba(255,255,255,.34);
  --line-4:rgba(255,255,255,.55);
  --grid-major:rgba(255,255,255,.075);
  --grid-minor:rgba(255,255,255,.030);
  --accent-line:rgba(255,215,0,.42);
  --accent-soft:rgba(255,215,0,.10);

  --serif:Georgia,'Times New Roman','Noto Serif SC','Source Han Serif SC',serif;
  --sans:'IBM Plex Sans',-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --mono:Consolas,'Lucida Console','Courier New',monospace;

  --g:40px;
  --g2:8px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:72px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;overflow-x:clip;-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--sans);font-size:15px;line-height:1.75;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:clip;
}
/* 全站图纸底纹（固定层，弱） */
body::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(var(--grid-minor) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-minor) 1px,transparent 1px);
  background-size:var(--g) var(--g);
}
img,svg{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;font-family:var(--serif);font-weight:700;color:var(--white);line-height:1.24;letter-spacing:.01em;}
p{margin:0;}
button{font:inherit;}
::selection{background:var(--accent);color:var(--bg);}
:focus-visible{outline:1px dashed var(--accent);outline-offset:3px;}
.mono{font-family:var(--mono);}

.wrap{width:min(1360px,calc(100% - 112px));margin:0 auto;position:relative;z-index:3;}

/* ===================== 跳转链接 ===================== */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--accent);color:var(--bg);padding:10px 18px;
  font-size:13px;letter-spacing:.06em;
}
.skip-link:focus{left:14px;top:14px;}

/* ===================== 顶部规格条（滚动离场） ===================== */
.topbar{
  position:relative;z-index:81;
  background:var(--ink-deep);
  border-bottom:1px solid var(--line-1);
  font-family:var(--mono);font-size:9.5px;letter-spacing:.22em;
  color:var(--muted);text-transform:uppercase;
}
.topbar-inner{
  width:min(1360px,calc(100% - 112px));margin:0 auto;
  display:flex;justify-content:space-between;gap:20px;padding:9px 0;
}
.topbar .tick{color:var(--accent);}
.tb-right{white-space:nowrap;}

/* ===================== 固定导航（图纸标题栏） ===================== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(0,18,39,.88);
  border-bottom:1px solid var(--line-1);
  backdrop-filter:blur(14px) saturate(120%);-webkit-backdrop-filter:blur(14px) saturate(120%);
}
.site-header::after{
  content:'';position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent 0,var(--accent) 22%,var(--accent) 34%,transparent 46%,transparent 100%);
  opacity:.65;pointer-events:none;
}
.site-header .header-inner{
  width:min(1360px,calc(100% - 112px));margin:0 auto;
  min-height:var(--header-h);
  display:flex;align-items:center;gap:32px;
}
.logo{display:flex;align-items:center;flex-shrink:0;}
.logo img{height:40px;width:auto;}
.main-nav{display:flex;align-items:center;gap:0;margin-left:auto;}
.main-nav a{
  position:relative;padding:10px 15px;font-size:13.5px;letter-spacing:.06em;color:var(--text);
  transition:color .25s ease;white-space:nowrap;
}
.main-nav a::before{
  content:'';position:absolute;left:15px;right:15px;bottom:5px;height:1px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease);
}
.main-nav a:hover{color:var(--white);}
.main-nav a:hover::before{transform:scaleX(1);}
.header-actions{display:flex;align-items:center;gap:16px;flex-shrink:0;}
.lang-switch{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--muted);
  border:1px solid var(--line-2);padding:6px 10px;transition:color .25s,border-color .25s;
}
.lang-switch:hover{color:var(--accent);border-color:var(--accent-line);}
.nav-toggle{
  display:none;background:none;border:1px solid var(--line-2);cursor:pointer;
  width:40px;height:38px;padding:9px 10px;flex-direction:column;justify-content:space-between;
}
.nav-toggle span{display:block;height:1px;background:var(--white);transition:transform .3s var(--ease),opacity .3s;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(4.5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg);}

/* ===================== 按钮 ===================== */
.btn{
  position:relative;display:inline-flex;align-items:center;gap:12px;border-radius:0;cursor:pointer;
  padding:14px 26px;font-family:var(--sans);font-size:14px;letter-spacing:.09em;
  border:1px solid transparent;background:transparent;color:var(--white);overflow:hidden;
  transition:color .3s ease,background .3s ease,border-color .3s ease,transform .3s ease;
  isolation:isolate;
}
.btn-primary{
  background:var(--accent);color:var(--bg);font-weight:700;
  box-shadow:0 16px 40px -22px rgba(255,215,0,.9),inset 0 0 0 1px rgba(255,255,255,.25);
}
.btn-primary:hover{background:#FFE55C;transform:translateY(-2px);}
.btn-ghost{border-color:var(--line-3);color:var(--white);}
.btn-ghost::before{
  content:'';position:absolute;inset:0;background:var(--accent);transform:scaleY(0);transform-origin:bottom;
  transition:transform .38s var(--ease);z-index:-1;
}
.btn-ghost:hover{border-color:var(--accent);color:var(--bg);}
.btn-ghost:hover::before{transform:scaleY(1);}
.btn-light{background:var(--white);color:var(--bg);font-weight:700;}
.btn-light:hover{background:var(--accent);transform:translateY(-2px);}
.btn-outline-light{border-color:var(--line-3);color:var(--white);}
.btn-outline-light:hover{border-color:var(--accent);color:var(--accent);}
.btn-whatsapp,.btn-telegram{border-color:var(--line-3);color:var(--white);}
.btn-whatsapp:hover,.btn-telegram:hover{border-color:var(--accent);color:var(--accent);}
.btn-quote{padding:11px 20px;font-size:13px;}

/* ===================== 固定图框 + CAD 光标（JS 注入） ===================== */
.sheet-frame{position:fixed;inset:14px;z-index:60;pointer-events:none;border:1px solid rgba(255,255,255,.09);}
.sheet-frame .fc{position:absolute;width:28px;height:28px;}
.sheet-frame .fc::before,.sheet-frame .fc::after{content:'';position:absolute;background:rgba(255,255,255,.5);}
.sheet-frame .fc::before{width:28px;height:1px;top:0;}
.sheet-frame .fc::after{height:28px;width:1px;left:0;}
.sheet-frame .fc.tl{top:-1px;left:-1px;}
.sheet-frame .fc.tr{top:-1px;right:-1px;transform:scaleX(-1);}
.sheet-frame .fc.bl{bottom:-1px;left:-1px;transform:scaleY(-1);}
.sheet-frame .fc.br{bottom:-1px;right:-1px;transform:scale(-1,-1);}
.sheet-frame .ruler{
  position:absolute;left:-1px;top:50%;transform:translateY(-50%);
  width:6px;height:180px;
  background:repeating-linear-gradient(to bottom,rgba(255,215,0,.6) 0 1px,transparent 1px 12px);
  border-left:1px solid rgba(255,255,255,.22);
}
.sheet-frame .ruler.r{left:auto;right:-1px;border-left:0;border-right:1px solid rgba(255,255,255,.22);}
.sheet-frame .stamp{
  position:absolute;right:6px;bottom:6px;
  font-family:var(--mono);font-size:8.5px;letter-spacing:.2em;color:rgba(255,255,255,.28);
  padding:3px 6px;border:1px solid rgba(255,255,255,.12);
}
.cad-cursor{position:fixed;left:0;top:0;width:0;height:0;z-index:95;pointer-events:none;display:none;}
.cad-cursor .ch,.cad-cursor .cv{position:absolute;background:var(--accent);opacity:0;transition:opacity .3s ease;}
.cad-cursor .ch{left:-52px;top:0;width:104px;height:1px;}
.cad-cursor .cv{top:-52px;left:0;width:1px;height:104px;}
.cad-cursor .box{position:absolute;left:-5px;top:-5px;width:10px;height:10px;border:1px solid var(--accent);opacity:0;transition:opacity .3s ease;}
.cad-cursor .box::before,.cad-cursor .box::after{content:'';position:absolute;background:var(--accent);opacity:.9;}
.cad-cursor .box::before{left:4px;top:-4px;width:1px;height:18px;}
.cad-cursor .box::after{top:4px;left:-4px;height:1px;width:18px;}
.cad-cursor.on .ch,.cad-cursor.on .cv,.cad-cursor.on .box{opacity:1;}
.cad-cursor .val{
  position:absolute;left:12px;top:10px;font-family:var(--mono);font-size:9px;
  letter-spacing:.14em;color:var(--accent);opacity:0;white-space:nowrap;transition:opacity .3s ease;
}
.cad-cursor.on .val{opacity:.75;}

/* ===================== 首屏 ===================== */
.hero{
  position:relative;padding:96px 0 0;overflow:hidden;
  background:
    radial-gradient(1100px 640px at 74% 6%,rgba(255,215,0,.075),transparent 60%),
    radial-gradient(820px 520px at 10% 88%,rgba(122,155,181,.13),transparent 66%),
    linear-gradient(180deg,#00244A 0%,var(--bg) 46%,#001A35 100%);
}
.hero::before{
  content:'';position:absolute;top:0;left:0;width:38%;height:420px;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.055) 0 1px,transparent 1px 7px);
  mask-image:linear-gradient(125deg,#000 0%,transparent 62%);
  -webkit-mask-image:linear-gradient(125deg,#000 0%,transparent 62%);
}
.hero::after{
  content:'';position:absolute;right:-260px;bottom:-320px;width:900px;height:900px;z-index:0;pointer-events:none;
  border:1px solid rgba(255,255,255,.10);
  border-radius:50%;
  box-shadow:0 0 0 80px rgba(255,255,255,.018),0 0 0 160px rgba(255,255,255,.012),0 0 120px rgba(255,215,0,.05) inset;
}
.hero-grid{
  position:relative;z-index:3;
  display:grid;grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr);
  gap:64px;align-items:center;padding-bottom:76px;
}
.hero-copy{position:relative;z-index:3;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;margin-bottom:28px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--white);border:1px solid var(--line-2);padding:7px 13px;
  background:linear-gradient(90deg,rgba(255,255,255,.05),transparent);
}
.eyebrow::before{
  content:'';width:6px;height:6px;background:var(--accent);display:block;
  animation:blink 1.15s steps(1,end) infinite;
}
.hero h1{font-size:clamp(32px,3.55vw,57px);line-height:1.2;letter-spacing:.015em;margin-bottom:22px;}
.hero-sub{
  font-family:var(--serif);font-size:15.5px;letter-spacing:.02em;color:var(--text);
  line-height:1.95;max-width:600px;margin-bottom:8px;
}
.hero-lead{max-width:600px;font-size:14.5px;line-height:2.05;color:var(--text);opacity:.92;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px;}

/* 首屏工程图（hero-media → dwg 画框） */
.hero-media{
  position:relative;border:1px solid var(--line-2);
  animation:rise 1s var(--ease) .15s both;
  background:
    linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012)),
    rgba(0,24,50,.55);
  box-shadow:0 40px 90px -50px rgba(0,0,0,.9),inset 0 0 80px rgba(255,255,255,.02);
  padding:44px 10px 6px;
}
.hero-media::before{
  content:'OCS SCHEMATIC / FIG. 01 — SCALE NTS';
  position:absolute;top:0;left:0;right:0;
  display:flex;align-items:center;justify-content:space-between;
  padding:11px 16px;border-bottom:1px solid var(--line-1);
  font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase;
}
.hero-media::after{
  content:'';position:absolute;top:13px;right:16px;width:5px;height:5px;background:var(--accent);
  animation:blink 1.15s steps(1,end) infinite;
}
.hero-media .catenary{position:relative;z-index:1;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:20px 20px;}

/* 标题栏参数块（titleblock → dwg-title） */
.titleblock{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  border-top:1px solid var(--line-1);border-left:1px solid var(--line-1);
  font-family:var(--mono);margin:0 0 56px;
}
.titleblock .tb-cell{
  display:flex;justify-content:space-between;align-items:baseline;gap:14px;
  padding:11px 16px;border-right:1px solid var(--line-1);border-bottom:1px solid var(--line-1);
}
.titleblock .tb-label{
  font-size:8.5px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase;white-space:nowrap;
}
.titleblock .tb-value{font-size:11px;letter-spacing:.08em;color:var(--white);text-align:right;}
.titleblock .sep{color:var(--muted);}

/* ===================== 通用板块 ===================== */
.section{position:relative;padding:110px 0;overflow:hidden;z-index:1;}
.section-alt{
  background:
    radial-gradient(900px 500px at 86% 0%,rgba(255,255,255,.05),transparent 62%),
    linear-gradient(180deg,#00203F,#001A35 60%,#001E3C);
  border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1);
}
.section-tight{padding:56px 0 88px;}

.callout{
  position:relative;margin-bottom:60px;padding-bottom:24px;
  border-bottom:1px solid var(--line-2);
  display:flex;align-items:flex-end;gap:26px;
}
.callout::before{
  content:'';position:absolute;left:50%;bottom:-1px;height:2px;width:min(420px,46%);
  background:var(--accent);transform:translateX(-50%);
}
.callout::after{
  content:'';position:absolute;left:50%;bottom:-5px;width:9px;height:9px;
  border-left:1px solid var(--accent);border-bottom:1px solid var(--accent);
  transform:translate(-100%,0) rotate(45deg);opacity:1;
}
.callout-no{
  font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--accent);
  text-transform:uppercase;flex-shrink:0;padding-bottom:8px;
}
.section-title{font-size:clamp(26px,2.8vw,40px);line-height:1.25;}
.callout-tag{
  font-family:var(--mono);font-size:10px;letter-spacing:.24em;color:var(--muted);
  text-transform:uppercase;margin-left:auto;padding-bottom:8px;text-align:right;flex-shrink:0;
}
.section-more{margin-top:34px;}
.widget-title{font-size:clamp(22px,2.2vw,30px);margin-bottom:30px;}

/* ===================== 面包屑 ===================== */
.breadcrumb-row{padding-top:34px;}
.breadcrumb{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px 0;align-items:center;}
.breadcrumb li{display:flex;align-items:center;color:var(--muted);}
.breadcrumb li+li::before{content:'/';margin:0 10px;color:var(--line-3);}
.breadcrumb a{color:var(--muted);transition:color .25s;}
.breadcrumb a:hover{color:var(--accent);}
.breadcrumb li.active a{color:var(--white);}

/* ===================== 产品矩阵（cat-card → prod 卡） ===================== */
.cat-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;
  background:var(--line-1);border:1px solid var(--line-1);
}
.cat-card{
  position:relative;background:#001F3E;padding:30px 26px 24px;min-height:230px;
  display:flex;flex-direction:column;overflow:hidden;
  transition:background .45s ease;
}
.cat-card::before{
  content:'';position:absolute;top:0;left:0;height:1px;width:100%;z-index:2;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .5s var(--ease);
}
.cat-card::after{
  content:'';position:absolute;bottom:0;right:0;height:1px;width:100%;z-index:2;
  background:var(--accent);transform:scaleX(0);transform-origin:right;
  transition:transform .5s var(--ease) .12s;
}
.cat-card:hover{background:#002B54;}
.cat-card:hover::before,.cat-card:hover::after{transform:scaleX(1);}
.cat-index{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--muted);margin-bottom:20px;transition:color .35s;}
.cat-card h3{font-size:18px;letter-spacing:.04em;margin-bottom:8px;position:relative;z-index:1;}
.cat-card p{font-size:12.5px;color:var(--muted);line-height:1.8;position:relative;z-index:1;}
.cat-card:hover .cat-index{color:var(--accent);}
.cat-arrow{
  margin-top:auto;align-self:flex-end;color:var(--muted);font-family:var(--mono);font-size:15px;
  transition:transform .4s var(--ease),color .35s;
}
.cat-card:hover .cat-arrow{color:var(--accent);transform:translateX(6px);}

/* ===================== 产品卡（product-card） ===================== */
.product-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;
  background:var(--line-1);border:1px solid var(--line-1);
}
.product-card{
  position:relative;background:#001F3E;padding:0 0 22px;
  display:flex;flex-direction:column;
  transition:background .45s ease;
}
.product-card::before{
  content:'';position:absolute;top:0;left:0;height:1px;width:100%;z-index:2;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .5s var(--ease);
}
.product-card::after{
  content:'';position:absolute;bottom:0;right:0;height:1px;width:100%;z-index:2;
  background:var(--accent);transform:scaleX(0);transform-origin:right;
  transition:transform .5s var(--ease) .12s;
}
.product-card:hover{background:#002B54;}
.product-card:hover::before,.product-card:hover::after{transform:scaleX(1);}
.product-media{
  border-bottom:1px solid var(--line-1);overflow:hidden;background:rgba(0,10,22,.4);
}
.product-media img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .6s var(--ease);}
.product-card:hover .product-media img{transform:scale(1.045);}
.product-info{padding:20px 24px 0;}
.product-info h2,.product-info h3{font-size:17px;line-height:1.4;margin-bottom:8px;transition:color .3s;}
.product-card:hover .product-info h2,.product-card:hover .product-info h3{color:var(--accent);}
.product-info p{font-size:12.5px;color:var(--muted);line-height:1.8;}

/* ===================== KV / 亮点（perf-item → kv 角标盒） ===================== */
.perf-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;}
.perf-item{
  position:relative;border:1px solid var(--line-2);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  padding:26px 26px 24px;
}
.perf-item::before,.perf-item::after{content:'';position:absolute;width:12px;height:12px;border:1px solid var(--accent);}
.perf-item::before{top:-1px;left:-1px;border-right:0;border-bottom:0;}
.perf-item::after{bottom:-1px;right:-1px;border-left:0;border-top:0;}
.perf-item h3{font-size:19px;margin-bottom:12px;}
.perf-item p{font-size:13px;line-height:1.95;color:var(--text);opacity:.9;}
.perf-item p strong{color:var(--white);}

/* ===================== CTA 带（cta-band → contact 底光） ===================== */
.cta-band{
  position:relative;padding:96px 0;overflow:hidden;
  background:
    radial-gradient(780px 460px at 18% 8%,rgba(255,215,0,.10),transparent 62%),
    radial-gradient(620px 400px at 92% 0%,rgba(122,155,181,.16),transparent 66%),
    linear-gradient(180deg,#001A35,#001227);
  border-top:1px solid var(--line-2);
}
.cta-band::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:var(--g) var(--g);
  mask-image:linear-gradient(180deg,transparent,#000 55%);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 55%);
}
.cta-inner{position:relative;z-index:2;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;}
.cta-band h2{font-size:clamp(26px,3vw,42px);line-height:1.3;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;}

/* ===================== 页面骨架（page-title/desc/content） ===================== */
.page-title{font-size:clamp(30px,3.2vw,48px);line-height:1.22;margin-bottom:18px;}
.page-desc{font-size:15px;color:var(--muted);line-height:1.95;max-width:820px;margin-bottom:10px;}
.page-body{padding-bottom:26px;}
.page-content{
  font-size:14.5px;line-height:2.05;color:var(--text);opacity:.96;
}
.page-content p{margin-bottom:16px;}
.page-content h2{font-size:clamp(22px,2.2vw,30px);margin:38px 0 16px;}
.page-content h3{font-size:19px;margin:30px 0 12px;}
.page-content strong{color:var(--white);}
.page-content a{color:var(--accent);border-bottom:1px solid var(--accent-line);}
.page-content a:hover{border-bottom-color:var(--accent);}
.page-content ul{list-style:none;margin:0 0 16px;}
.page-content ul li{position:relative;padding-left:22px;margin-bottom:8px;}
.page-content ul li::before{content:'';position:absolute;left:2px;top:.72em;width:6px;height:6px;background:var(--accent);transform:rotate(45deg);}
.page-content img{border:1px solid var(--line-1);}
.sort-def{border-left:2px solid var(--accent-line);padding-left:20px;margin-bottom:34px;}

/* ===================== 子栏目页签 + 分页 ===================== */
.subcat-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 38px;}
.subcat-tabs a{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--line-2);padding:8px 12px;
  transition:color .25s,border-color .25s,background .25s;
}
.subcat-tabs a:hover{color:var(--accent);border-color:var(--accent-line);}
.pager{display:flex;flex-wrap:wrap;gap:8px;margin-top:44px;font-family:var(--mono);font-size:12px;}
.pager a,.pager span{
  display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:38px;padding:0 12px;
  border:1px solid var(--line-2);color:var(--text);transition:border-color .25s,color .25s,background .25s;
}
.pager a:hover{border-color:var(--accent-line);color:var(--accent);}
.pager span{background:var(--accent);color:var(--bg);border-color:var(--accent);font-weight:700;}

/* ===================== 产品详情 ===================== */
.pd-header{margin-bottom:44px;}
.pd-title{font-size:clamp(28px,3vw,46px);line-height:1.22;}
.pd-subtitle{font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--accent);margin-top:12px;}
.pd-grid{display:grid;grid-template-columns:minmax(0,.94fr) minmax(0,1.06fr);gap:40px;align-items:start;margin-bottom:56px;}
.pd-media{
  position:relative;border:1px solid var(--line-2);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012)),rgba(0,24,50,.55);
  padding:14px;
}
.pd-media img{width:100%;height:auto;}
.pd-img-note{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--muted);
  padding:10px 4px 2px;text-transform:uppercase;
}
.pd-spec{position:relative;}
.pd-spec-title{font-size:clamp(20px,2vw,26px);margin-bottom:18px;}
.spec-table{width:100%;border-collapse:collapse;border:1px solid var(--line-2);background:rgba(0,15,32,.45);}
.spec-table th,.spec-table td{
  text-align:left;padding:13px 18px;border-bottom:1px solid var(--line-1);vertical-align:top;
}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0;}
.spec-table th{
  font-family:var(--sans);font-weight:400;font-size:12.5px;color:var(--muted);letter-spacing:.04em;
  width:42%;
}
.spec-table th::before{content:'';display:inline-block;width:3px;height:3px;background:var(--accent);margin-right:9px;vertical-align:2px;}
.spec-table td{font-family:var(--mono);font-size:13.5px;color:var(--white);letter-spacing:.02em;line-height:1.6;}
.spec-table tr:hover th,.spec-table tr:hover td{background:rgba(255,255,255,.035);}
.pd-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px;}
.pd-body{margin-bottom:56px;}
.pd-perf{margin-bottom:56px;}
.pd-perf .section-title{margin-bottom:30px;}
.pd-scene{margin-bottom:64px;}
.pd-scene .section-title{margin-bottom:30px;}
.scene-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;}
.pd-app-card{
  position:relative;border:1px solid var(--line-2);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  padding:26px;transition:border-color .35s ease,transform .35s var(--ease);
}
.pd-app-card:hover{border-color:var(--accent-line);transform:translateX(4px);}
.pd-app-card h2{font-size:19px;margin-bottom:10px;}
.pd-app-card p{font-size:13px;line-height:1.9;color:var(--muted);}
.pd-app-icon{
  width:42px;height:42px;border:1px solid var(--line-2);display:grid;place-items:center;
  margin-bottom:18px;transition:border-color .35s,transform .5s var(--ease);
  font-size:17px;color:var(--white);
}
.pd-app-card:hover .pd-app-icon{border-color:var(--accent);transform:rotate(45deg);color:var(--accent);}
.pd-app-card:hover .pd-app-icon *{transform:rotate(-45deg);}

/* ===================== 文档行（doc-row → news-item 风） ===================== */
.doc-list{border-top:1px solid var(--line-2);}
.doc-row{
  position:relative;display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;
  padding:22px 6px 22px 0;border-bottom:1px solid var(--line-1);
  transition:padding-left .4s var(--ease),background .4s ease;
}
.doc-row:hover{padding-left:14px;background:rgba(255,255,255,.025);}
.doc-row::after{
  content:'';position:absolute;left:0;bottom:-1px;height:1px;width:0;background:var(--accent);
  transition:width .5s var(--ease);
}
.doc-row:hover::after{width:100%;}
.doc-thumb{width:96px;height:64px;object-fit:cover;border:1px solid var(--line-1);}
.doc-body h2,.doc-body h3{font-family:var(--serif);font-size:17.5px;line-height:1.5;margin-bottom:6px;transition:color .3s;}
.doc-row:hover .doc-body h2,.doc-row:hover .doc-body h3{color:var(--accent);}
.doc-body p{font-size:12.5px;color:var(--muted);line-height:1.85;}
.doc-arrow{color:var(--muted);font-family:var(--mono);font-size:15px;transition:transform .4s var(--ease),color .3s;}
.doc-row:hover .doc-arrow{color:var(--accent);transform:translateX(6px);}

/* ===================== 数据条（standards-strip → hero-facts 风） ===================== */
.standards-strip{
  position:relative;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);
  background:linear-gradient(90deg,rgba(255,215,0,.035),rgba(255,255,255,.02) 40%,transparent);
  margin:26px 0 8px;
}
.strip-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));}
.strip-item{
  padding:24px 24px;border-right:1px solid var(--line-1);
  display:flex;flex-direction:column;gap:8px;transition:background .35s ease;
}
.strip-item:last-child{border-right:0;}
.strip-item:hover{background:rgba(255,255,255,.03);}
.strip-item .mono{font-family:var(--serif);font-size:clamp(22px,2vw,30px);color:var(--white);line-height:1;font-variant-numeric:tabular-nums;}
.strip-item span:last-child{font-family:var(--mono);font-size:9px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase;line-height:1.7;}

/* ===================== 404 ===================== */
.nf-wrap{min-height:52vh;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;padding:120px 0;}
.nf-code{font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--accent);margin-bottom:20px;}
.nf-wrap h1{font-size:clamp(34px,4vw,60px);margin-bottom:18px;}
.nf-wrap p{color:var(--muted);margin-bottom:10px;max-width:520px;}
.nf-wrap p + p{margin-bottom:30px;}

/* ===================== 页脚 ===================== */
.site-footer{
  position:relative;z-index:2;margin-top:0;border-top:1px solid var(--line-2);
  padding:64px 0 0;
  background:linear-gradient(180deg,#001A35,#001227);
}
.footer-grid{
  display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,.9fr) minmax(0,.8fr) minmax(0,1.2fr);
  gap:44px;padding-bottom:52px;
}
.footer-brand img{height:40px;width:auto;margin-bottom:18px;background:rgba(255,255,255,.04);padding:6px;}
.footer-col h2{
  font-family:var(--mono);font-size:9px;font-weight:400;letter-spacing:.24em;
  color:var(--accent);text-transform:uppercase;margin-bottom:16px;
}
.footer-col{display:flex;flex-direction:column;gap:10px;align-items:flex-start;}
.footer-col a{font-size:13px;color:var(--text);transition:color .25s,padding-left .3s var(--ease);}
.footer-col a:hover{color:var(--accent);padding-left:6px;}
.footer-col p{font-size:12.5px;line-height:1.85;color:var(--text);}
.footer-col p a{padding:0;display:inline;}
.footer-col p a:hover{color:var(--accent);}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;
  padding:20px 0 30px;border-top:1px solid var(--line-1);
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;
}
.footer-bottom .mono{font-size:10px;}
.footer-bottom p{margin:0;}
.isot-pwby svg{opacity:.85;}
.footer-bottom .isot-pwby{margin-right:auto;}
.footer-bottom > p{order:2;}
.footer-bottom .isot-pwby + p{order:1;}
.footer-bottom .mono{order:3;}

/* ===================== RFQ 悬浮条 ===================== */
.rfq-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  background:rgba(0,18,39,.92);
  border-top:1px solid var(--line-2);
  backdrop-filter:blur(14px) saturate(120%);-webkit-backdrop-filter:blur(14px) saturate(120%);
  box-shadow:0 -18px 50px -30px rgba(0,0,0,.9);
}
.rfq-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:12px 0;}
.rfq-text{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--white);text-transform:uppercase;}
.rfq-actions{display:flex;gap:10px;flex-wrap:wrap;}
.rfq-actions .btn{padding:10px 18px;font-size:13px;}

/* ===================== SVG 接触网图（复用 chuangwei-en 类名） ===================== */
.catenary{width:100%;height:auto;display:block;}
.catenary .stroke{
  fill:none;stroke:#D8E4F0;stroke-width:2.2;
  stroke-linecap:round;stroke-linejoin:round;
}
.catenary .stroke-thin{stroke-width:1.3;opacity:.75;}
.catenary .stroke-steel{stroke:var(--muted);stroke-width:1.5;}
.catenary .node{fill:var(--accent);stroke:none;}
.catenary .dim{font-family:var(--mono);font-size:13px;letter-spacing:.08em;fill:var(--muted);stroke:none;}
@media (prefers-reduced-motion: no-preference){
  .catenary .draw{
    stroke-dasharray:1;stroke-dashoffset:1;
    animation:catdraw 1.5s cubic-bezier(.5,0,.2,1) forwards;
  }
  .catenary .draw.d2{animation-delay:.25s;}
  .catenary .draw.d3{animation-delay:.5s;}
  .catenary .draw.d4{animation-delay:.75s;}
  .catenary .node{opacity:0;animation:catnode .4s ease 1.4s forwards;}
}
@keyframes catdraw{to{stroke-dashoffset:0;}}
@keyframes catnode{to{opacity:1;}}

/* ===================== 动画 ===================== */
@keyframes blink{0%,49%{opacity:1;}50%,100%{opacity:.12;}}
@keyframes rise{from{opacity:0;transform:translateY(26px);}to{opacity:1;transform:none;}}
@keyframes marquee{from{transform:translateX(0);}to{transform:translateX(-50%);}}
@keyframes rule-draw{to{transform:scaleX(1);}}
@keyframes fade-in{to{opacity:1;}}

/* h1 金线高亮（br12.js 包裹 .hl；no-JS=纯文本） */
.hero h1 .hl{position:relative;display:inline-block;color:var(--accent);}
.hero h1 .hl::after{
  content:'';position:absolute;left:-2px;right:-2px;top:52%;height:1px;background:var(--accent);
  transform:scaleX(0);transform-origin:center;
  animation:rule-draw 1s var(--ease) .9s forwards;opacity:.55;
}

/* 标准认证跑马灯（br12.js 注入，aria-hidden 装饰） */
.strip{
  position:relative;z-index:3;overflow:hidden;
  border-bottom:1px solid var(--line-1);
  background:rgba(255,255,255,.016);
  padding:15px 0;
}
.strip::before,.strip::after{
  content:'';position:absolute;top:0;bottom:0;width:120px;z-index:2;pointer-events:none;
}
.strip::before{left:0;background:linear-gradient(90deg,var(--bg),transparent);}
.strip::after{right:0;background:linear-gradient(270deg,var(--bg),transparent);}
.strip-inner{display:flex;align-items:center;gap:44px;white-space:nowrap;width:max-content;
  animation:marquee 48s linear infinite;}
.strip:hover .strip-inner{animation-play-state:paused;}
.strip-item{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);}
.strip-item b{color:var(--white);font-weight:400;}
.strip-item i{width:6px;height:6px;background:var(--accent);display:block;font-style:normal;transform:rotate(45deg);}

/* 滚动进场（渐进增强：仅 JS 预藏，no-JS/无 IO 全部静态可见；播完即摘属性还原原生样式） */
[data-anim-pre]{opacity:0;transform:translateY(22px);}
[data-anim-pre].in{opacity:1;transform:none;transition:opacity .9s var(--ease),transform .9s var(--ease);}
.callout[data-line-pre]::before{width:0;transition:none;}
.callout[data-line-pre].in::before{width:min(420px,46%);transition:width 1.2s var(--ease) .15s;}
.callout[data-line-pre]::after{transform:translateX(-100%) rotate(45deg) scale(0);opacity:0;transition:none;}
.callout[data-line-pre].in::after{transform:translate(-100%,0) rotate(45deg) scale(1);opacity:1;transition:transform .45s var(--ease) 1.15s,opacity .3s ease 1.15s;}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  .hero-media{animation:none;}
}

/* ===================== 响应式 1180 ===================== */
@media (max-width:1180px){
  .wrap,.topbar-inner,.site-header .header-inner{width:calc(100% - 56px);}
  .site-header .header-inner{gap:20px;}
  .main-nav a{padding:10px 10px;font-size:13px;}
  .cat-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .product-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .strip-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .strip-item:nth-child(3n){border-right:0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
}

/* ===================== 平板 980 ===================== */
@media (max-width:980px){
  .sheet-frame,.cad-cursor{display:none !important;}
  .main-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:none;flex-direction:column;align-items:stretch;gap:0;
    background:rgba(0,18,39,.97);border-bottom:1px solid var(--line-2);
    padding:10px 0 18px;z-index:79;
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:13px 28px;border-bottom:1px solid var(--line-1);font-size:14px;}
  .main-nav a::before{display:none;}
  .nav-toggle{display:flex;margin-left:4px;}
  .btn-quote{display:none;}
  .hero{padding-top:64px;}
  .hero-grid{grid-template-columns:1fr;gap:44px;padding-bottom:52px;}
  .section{padding:84px 0;}
  .section-tight{padding:44px 0 72px;}
  .callout{flex-wrap:wrap;gap:12px 20px;margin-bottom:44px;}
  .callout-tag{margin-left:0;text-align:left;}
  .perf-grid,.scene-grid{grid-template-columns:1fr;}
  .pd-grid{grid-template-columns:1fr;}
  .titleblock{grid-template-columns:1fr;}
  .strip-grid{grid-template-columns:1fr 1fr;}
  .strip-item:nth-child(3n){border-right:1px solid var(--line-1);}
  .strip-item:nth-child(2n){border-right:0;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}

/* ===================== 手机 640 ===================== */
@media (max-width:640px){
  body{font-size:14.5px;}
  .wrap,.topbar-inner,.site-header .header-inner{width:calc(100% - 40px);}
  .site-header .header-inner{min-height:64px;gap:14px;}
  .logo img{height:32px;}
  .topbar-inner{justify-content:center;}
  .tb-right{display:none;}
  .hero{padding-top:48px;}
  .hero h1{font-size:31px;line-height:1.26;}
  .hero-cta .btn{width:100%;justify-content:center;}
  .cat-grid,.product-grid{grid-template-columns:1fr;}
  .cat-card{min-height:0;}
  .strip-grid{grid-template-columns:1fr;}
  .strip-item{border-right:0;border-bottom:1px solid var(--line-1);}
  .strip-item:last-child{border-bottom:0;}
  .footer-grid{grid-template-columns:1fr;}
  .cta-inner{flex-direction:column;align-items:flex-start;}
  .rfq-text{display:none;}
  .rfq-inner{justify-content:center;}
  .doc-row{grid-template-columns:1fr auto;gap:14px;}
  .doc-thumb{display:none;}
  .scene-grid{grid-template-columns:1fr;}
  .spec-table th{width:46%;}
  .titleblock .tb-cell{flex-direction:column;align-items:flex-start;gap:4px;}
  .titleblock .tb-value{text-align:left;}
}

/* ===================== RTL 垫（ar 本地化时启用） ===================== */
[dir="rtl"] .cat-arrow{transform:scaleX(-1);}
[dir="rtl"] .cat-card:hover .cat-arrow{transform:scaleX(-1) translateX(6px);}
[dir="rtl"] .doc-row::after{left:auto;right:0;}
[dir="rtl"] .doc-row:hover{padding-left:0;padding-right:14px;}
[dir="rtl"] .doc-arrow{transform:scaleX(-1);}
[dir="rtl"] .page-content ul li{padding-left:0;padding-right:22px;}
[dir="rtl"] .page-content ul li::before{left:auto;right:2px;}
[dir="rtl"] .sort-def{border-left:0;border-right:2px solid var(--accent-line);padding-left:0;padding-right:20px;}
[dir="rtl"] .pd-app-card:hover{transform:translateX(-4px);}