/* ============================================================
   钢板站点主题样式 —— 主色 #D83A2E / 底色 #F5F3F3
   ============================================================ */
:root{
  --primary:#D83A2E;
  --primary-dark:#AE2A20;
  --primary-soft:#FBEAE8;
  --bg:#F5F3F3;
  --card:#FFFFFF;
  --ink:#26282C;
  --ink-2:#43464C;
  --muted:#75797F;
  --line:#E6E2E0;
  --dark:#24262A;
  --dark-2:#2E3136;
  --gold:#B98A2F;
  --shadow-sm:0 1px 3px rgba(30,30,32,.07);
  --shadow-md:0 10px 28px -12px rgba(30,30,32,.16);
  --shadow-lg:0 22px 48px -20px rgba(30,30,32,.24);
  --radius:8px;
  --w:1180px;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  font-size:16.5px;
  line-height:1.92;
  letter-spacing:.015em;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
table{border-collapse:collapse;width:100%}
.container{max-width:var(--w);margin:0 auto;padding:0 28px}
.skip{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:8px 16px;z-index:999}
.skip:focus{left:12px;top:12px}
::selection{background:var(--primary);color:#fff}

/* ---------- 顶部细条 + 头部 ---------- */
.topbar{background:var(--dark);color:#C9CCD1;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;min-height:38px;gap:16px}
.topbar a{color:#C9CCD1;transition:color .18s}
.topbar a:hover{color:#fff}
.topbar .tb-links{display:flex;gap:22px;align-items:center}
.lang-switch{display:flex;gap:10px;align-items:center}
.lang-switch .on{color:#fff;font-weight:600}
.lang-switch i{width:1px;height:12px;background:#4A4D53;display:inline-block}

.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm)}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:76px}
.brand{display:flex;align-items:center;gap:13px;min-width:0}
.brand .mark{width:46px;height:46px;flex:0 0 auto}
.brand-txt .cn{font-size:19px;font-weight:700;letter-spacing:.06em;line-height:1.3;white-space:nowrap}
.brand-txt .en{font-size:11.5px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;line-height:1.3}
.brand-txt .cn small{display:block;font-size:12px;color:var(--muted);font-weight:400;letter-spacing:.22em}

/* ---------- 主导航 ---------- */
.main-nav>ul{display:flex;gap:4px}
.main-nav a{display:block;padding:10px 16px;font-size:16px;font-weight:500;color:var(--ink-2);border-radius:6px;transition:all .18s;white-space:nowrap}
.main-nav>ul>li{position:relative}
.main-nav>ul>li>a{padding:22px 16px}
.main-nav a:hover{color:var(--primary)}
.main-nav li.active>a{color:var(--primary);font-weight:600}
.main-nav li.active>a::after{content:"";position:absolute;left:16px;right:16px;bottom:12px;height:3px;background:var(--primary);border-radius:2px}
.has-sub>a .arr{display:inline-block;width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-3px);margin-left:7px;transition:transform .2s}
.submenu{position:absolute;top:100%;left:8px;min-width:236px;background:#fff;border:1px solid var(--line);border-top:3px solid var(--primary);border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .22s;z-index:99;padding:8px 0}
.has-sub:hover .submenu,.has-sub:focus-within .submenu{opacity:1;visibility:visible;transform:translateY(0)}
.has-sub:hover>a .arr{transform:rotate(225deg) translateY(-2px)}
.submenu a{padding:10px 18px;font-size:15px;color:var(--ink-2)}
.submenu a:hover{background:var(--primary-soft);color:var(--primary)}
.submenu li.active a{color:var(--primary);font-weight:600}
.nav-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{width:20px;height:2px;background:var(--ink);transition:all .25s}

/* ---------- 面包屑 ---------- */
.crumb{padding:22px 0 0;font-size:13.5px;color:var(--muted)}
.crumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--primary)}
.crumb li+li::before{content:"/";margin-right:8px;color:#C9C5C3}
.crumb .cur{color:var(--ink)}

/* ---------- Hero ---------- */
.hero{position:relative;color:#fff;background:var(--dark);overflow:hidden}
.hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.42}
.hero .bg::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(20,21,24,.88) 8%,rgba(20,21,24,.55) 55%,rgba(216,58,46,.28))}
.hero .container{position:relative;padding-top:108px;padding-bottom:116px}
.hero .kicker-line{display:inline-flex;align-items:center;gap:12px;font-size:14.5px;letter-spacing:.3em;color:#F2B9B3;margin-bottom:22px}
.hero .kicker-line::before{content:"";width:38px;height:2px;background:var(--primary)}
.hero h1{font-size:clamp(34px,5vw,54px);font-weight:700;line-height:1.32;letter-spacing:.04em;max-width:15em}
.hero h1 em{font-style:normal;color:#F0857B}
.hero p.lead{margin-top:24px;max-width:34em;font-size:17.5px;color:#E4E6E9;line-height:2}
.hero .cta{margin-top:38px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 30px;border-radius:5px;font-size:16px;font-weight:600;letter-spacing:.05em;transition:all .2s;border:1px solid transparent;cursor:pointer}
.btn-r{background:var(--primary);color:#fff}
.btn-r:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 12px 24px -10px rgba(216,58,46,.55)}
.btn-o{border-color:rgba(255,255,255,.55);color:#fff}
.btn-o:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* ---------- 通用 section ---------- */
.sec{padding:92px 0}
.sec-tight{padding:66px 0}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{margin-bottom:52px;max-width:720px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:13.5px;font-weight:600;letter-spacing:.28em;color:var(--primary);text-transform:uppercase;margin-bottom:14px}
.kicker::before{content:"";width:26px;height:2px;background:var(--primary)}
.sec-head.center .kicker::after{content:"";width:26px;height:2px;background:var(--primary)}
.sec-head h2,.h2{font-size:clamp(26px,3.4vw,34px);font-weight:700;letter-spacing:.03em;line-height:1.4}
.sec-head .sub{margin-top:14px;color:var(--muted);font-size:16px;line-height:1.9}
.more-link{display:inline-flex;align-items:center;gap:7px;color:var(--primary);font-weight:600;font-size:15.5px;margin-top:8px}
.more-link:hover{color:var(--primary-dark)}
.more-link .a{transition:transform .2s}
.more-link:hover .a{transform:translateX(4px)}

/* ---------- 数字带 ---------- */
.stats{background:var(--dark);color:#fff}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding-top:44px;padding-bottom:44px}
.stat b{display:block;font-size:clamp(28px,3.2vw,40px);font-weight:700;letter-spacing:.02em;line-height:1.2}
.stat b i{font-style:normal;font-size:.55em;color:#F0857B;margin-left:3px}
.stat span{display:block;margin-top:6px;color:#A9ADB3;font-size:14.5px;letter-spacing:.08em}

/* ---------- 产品卡片网格 ---------- */
.grid{display:grid;gap:26px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px 26px;position:relative;overflow:hidden;transition:all .25s;display:flex;flex-direction:column}
.pcard::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--primary);transform:scaleX(0);transform-origin:left;transition:transform .3s}
.pcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:transparent}
.pcard:hover::before{transform:scaleX(1)}
.pcard .ic{width:52px;height:52px;color:var(--primary);margin-bottom:18px}
.pcard h3{font-size:19.5px;font-weight:700;letter-spacing:.02em}
.pcard .spec{margin:6px 0 12px;font-size:13.5px;color:var(--gold);letter-spacing:.06em;font-weight:600}
.pcard p{color:var(--muted);font-size:14.8px;line-height:1.85;flex:1}
.pcard .go{margin-top:16px;font-size:14.5px;font-weight:600;color:var(--primary);display:inline-flex;align-items:center;gap:6px}
.pcard:hover .go{color:var(--primary-dark)}

/* ---------- 图文分栏 ---------- */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.split.rev .s-media{order:2}
.s-media .figstack{position:relative}
.s-media .figstack .main-fig{border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.s-media .badge{position:absolute;right:-14px;bottom:-16px;background:var(--primary);color:#fff;border-radius:var(--radius);padding:16px 22px;box-shadow:var(--shadow-md)}
.s-media .badge b{display:block;font-size:24px;line-height:1.2}
.s-media .badge span{font-size:12.5px;opacity:.85;letter-spacing:.1em}
.s-copy p{margin-bottom:1.1em;text-align:justify}
.s-copy .list-check{margin:18px 0 6px}
.list-check li{position:relative;padding:7px 0 7px 34px;color:var(--ink-2)}
.list-check li::before{content:"";position:absolute;left:0;top:15px;width:19px;height:19px;border-radius:50%;background:var(--primary-soft)}
.list-check li::after{content:"";position:absolute;left:5.5px;top:20px;width:8px;height:4.5px;border-left:2px solid var(--primary);border-bottom:2px solid var(--primary);transform:rotate(-45deg)}

/* ---------- figure ---------- */
figure.photo{margin:34px 0}
figure.photo img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow-sm)}
figure.photo figcaption{margin-top:12px;text-align:center;font-size:13.5px;color:var(--muted);letter-spacing:.03em}
figure.photo figcaption::before{content:"▲ ";font-size:10px;color:var(--primary);vertical-align:1px}
.imgrow{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:34px 0}
.imgrow figure.photo{margin:0}

/* ---------- 内容主体（文章/详情页） ---------- */
.page-body{background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow-sm);padding:58px clamp(26px,5vw,72px) 54px;margin:30px 0 74px}
.page-head .kicker{margin-bottom:10px}
.page-head h1{font-size:clamp(27px,3.6vw,38px);font-weight:700;line-height:1.42;letter-spacing:.02em}
.page-head .meta{margin-top:16px;display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:14px;align-items:center}
.page-head .meta .cat{background:var(--primary-soft);color:var(--primary);padding:3px 12px;border-radius:99px;font-size:13px;font-weight:600}
.page-head hr{border:none;height:1px;background:var(--line);margin:28px 0 34px}
.lead-p{font-size:18px;color:var(--ink-2);line-height:2.05;margin-bottom:1.2em}
.page-body h2{font-size:24px;font-weight:700;margin:44px 0 18px;padding-left:16px;border-left:5px solid var(--primary);line-height:1.45;letter-spacing:.02em}
.page-body h3{font-size:19px;font-weight:700;margin:30px 0 12px}
.page-body p{margin-bottom:1.15em;text-align:justify}
.page-body p strong{color:var(--primary-dark)}
.page-body ul.disc{list-style:none;margin:0 0 1.2em}
.page-body ul.disc li{position:relative;padding:6px 0 6px 26px;text-align:justify}
.page-body ul.disc li::before{content:"";position:absolute;left:6px;top:18px;width:7px;height:7px;background:var(--primary);border-radius:2px;transform:rotate(45deg)}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;margin:26px 0 30px;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
table.data{min-width:560px;font-size:15px;background:#fff}
table.data caption{caption-side:top;text-align:left;font-weight:700;font-size:16.5px;padding:0 4px 14px;color:var(--ink)}
table.data th{background:var(--dark);color:#fff;font-weight:600;padding:13px 18px;text-align:left;letter-spacing:.05em;white-space:nowrap}
table.data td{padding:12px 18px;border-top:1px solid var(--line);color:var(--ink-2)}
table.data tbody tr:nth-child(even){background:#FAF8F8}
table.data tbody tr:hover{background:var(--primary-soft)}
table.data td:first-child{font-weight:600;color:var(--ink);white-space:nowrap}

/* 延伸阅读 2x4 */
.rel-title{font-size:21px;font-weight:700;margin:46px 0 6px;padding-left:16px;border-left:5px solid var(--primary)}
.rel-sub{color:var(--muted);font-size:14px;margin-bottom:16px}
table.rel{background:#fff;font-size:15px}
table.rel td{padding:0;border:1px solid var(--line)}
table.rel tr:nth-child(even) td{background:#FAF8F8}
table.rel a{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:13px 18px;transition:all .18s}
table.rel a .t{color:var(--ink-2);font-weight:500}
table.rel a .d{color:var(--muted);font-size:13px;white-space:nowrap}
table.rel a:hover{background:var(--primary-soft)}
table.rel a:hover .t{color:var(--primary);font-weight:600}

/* ---------- FAQ ---------- */
.faq{margin-top:14px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;overflow:hidden}
.faq summary{cursor:pointer;padding:17px 52px 17px 22px;font-weight:600;font-size:16.5px;position:relative;list-style:none;transition:background .18s}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:22px;top:50%;width:10px;height:10px;border-right:2px solid var(--primary);border-bottom:2px solid var(--primary);transform:translateY(-70%) rotate(45deg);transition:transform .25s}
.faq details[open] summary::after{transform:translateY(-30%) rotate(225deg)}
.faq summary:hover{background:var(--primary-soft)}
.faq .ans{padding:2px 22px 20px;color:var(--ink-2);text-align:justify}

/* ---------- 关键词标签 ---------- */
.tags-bar{margin:8px 0 60px}
.tags-bar .lb{font-size:13.5px;font-weight:700;letter-spacing:.2em;color:var(--muted);margin-bottom:14px;display:flex;align-items:center;gap:10px}
.tags-bar .lb::after{content:"";flex:1;height:1px;background:var(--line)}
.tags{display:flex;flex-wrap:wrap;gap:12px}
.tags a{display:inline-flex;align-items:center;background:#fff;border:1px solid var(--line);padding:7px 17px;border-radius:99px;font-size:14.5px;color:var(--ink-2);transition:all .18s}
.tags a::before{content:"#";color:var(--primary);margin-right:5px;font-weight:700}
.tags a:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft);transform:translateY(-2px)}

/* ---------- 文章卡片 ---------- */
.acard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:all .25s}
.acard:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.acard .thumb{height:196px;background-size:cover;background-position:center;position:relative}
.acard .thumb .cat{position:absolute;left:14px;top:14px;background:rgba(216,58,46,.94);color:#fff;font-size:12.5px;padding:4px 12px;border-radius:99px;letter-spacing:.08em}
.acard .in{padding:24px 24px 20px;display:flex;flex-direction:column;flex:1}
.acard h3{font-size:17.5px;line-height:1.6;font-weight:700}
.acard h3 a:hover{color:var(--primary)}
.acard p{margin-top:10px;color:var(--muted);font-size:14.5px;line-height:1.8;flex:1}
.acard .ft{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
.acard .ft b{color:var(--primary);font-weight:600}

/* ---------- 应用领域 chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 6px}
.chips span{background:#fff;border:1px solid var(--line);padding:6px 16px;border-radius:6px;font-size:14px;color:var(--ink-2)}
.chips span.hl{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}

/* ---------- CTA 带 ---------- */
.cta-band{background:linear-gradient(115deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;border-radius:12px;padding:52px 56px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;box-shadow:0 24px 48px -22px rgba(174,42,32,.55)}
.cta-band h3{font-size:clamp(21px,2.6vw,27px);letter-spacing:.04em;line-height:1.5}
.cta-band p{margin-top:8px;color:#FAD3CE;font-size:15.5px}
.cta-band .btn{background:#fff;color:var(--primary-dark)}
.cta-band .btn:hover{transform:translateY(-2px);box-shadow:0 14px 26px -12px rgba(0,0,0,.4)}

/* ---------- 人物插画（团队/服务形象） ---------- */
.person-card{position:relative;text-align:center}
.person-card svg{width:100%;max-width:330px;margin:0 auto}
.person-card .role{margin-top:10px;font-size:13.5px;color:var(--muted);letter-spacing:.12em}

/* ---------- 页脚（footer.html 注入） ---------- */
#siteFooter{margin-top:0}
.site-footer{background:var(--dark);color:#B9BDC3;font-size:14.5px}
.ft-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:44px;padding:64px 0 46px}
.ft-brand .mark{width:42px;height:42px;margin-bottom:14px}
.ft-brand .fm{font-size:17px;font-weight:700;color:#fff;letter-spacing:.08em}
.ft-brand p{margin-top:12px;line-height:1.95;color:#9BA0A7;text-align:justify}
.ft-col h4{color:#fff;font-size:15.5px;letter-spacing:.14em;margin-bottom:18px;position:relative;padding-bottom:12px}
.ft-col h4::after{content:"";position:absolute;left:0;bottom:0;width:26px;height:2px;background:var(--primary)}
.ft-col li{margin-bottom:10px}
.ft-col a{color:#B9BDC3;transition:all .18s}
.ft-col a:hover{color:#F0857B;padding-left:4px}
.ft-note{margin-top:10px;color:#9BA0A7;line-height:1.95}
.ft-bottom{border-top:1px solid #383B40;padding:22px 0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#82868C}
.ft-bottom a{color:#82868C}
.ft-bottom a:hover{color:#F0857B}

/* ---------- 返回顶部 ---------- */
.backtop{position:fixed;right:26px;bottom:30px;width:46px;height:46px;border-radius:8px;background:#fff;border:1px solid var(--line);color:var(--primary);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(12px);transition:all .25s;z-index:90;cursor:pointer}
.backtop.show{opacity:1;visibility:visible;transform:none}
.backtop:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---------- 工具类 ---------- */
.mt-0{margin-top:0}.mt-1{margin-top:12px}.mt-2{margin-top:24px}.mt-3{margin-top:40px}
.note{background:var(--primary-soft);border-left:4px solid var(--primary);padding:16px 22px;border-radius:0 6px 6px 0;color:var(--ink-2);margin:24px 0;text-align:justify}
.note b{color:var(--primary-dark)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .ft-top{grid-template-columns:1fr 1fr;gap:36px}
  .main-nav a{padding:20px 10px;font-size:15px}
}
@media (max-width:900px){
  .g3{grid-template-columns:repeat(2,1fr)}
  .split,.split.rev{grid-template-columns:1fr;gap:36px}
  .split.rev .s-media{order:0}
  .hero .container{padding-top:76px;padding-bottom:84px}
  .sec{padding:64px 0}
  /* 移动端导航 */
  .nav-toggle{display:flex}
  .main-nav{position:fixed;inset:0;top:0;background:#fff;z-index:98;padding:96px 30px 40px;transform:translateX(102%);transition:transform .3s;overflow-y:auto}
  body.nav-open .main-nav{transform:none}
  body.nav-open{overflow:hidden}
  .main-nav>ul{flex-direction:column;gap:2px}
  .main-nav>ul>li>a{padding:15px 6px;font-size:17px;border-bottom:1px solid var(--line)}
  .main-nav li.active>a::after{display:none}
  .submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-left:3px solid var(--primary);border-radius:0;margin:4px 0 8px 10px;display:none;padding:2px 0}
  .has-sub.open .submenu{display:block}
  .has-sub>a .arr{position:absolute;right:8px;top:24px}
  .topbar .tb-links{display:none}
  .topbar .container{justify-content:flex-end}
}
@media (max-width:640px){
  body{font-size:16px}
  .container{padding:0 20px}
  .g3,.g2,.g4{grid-template-columns:1fr}
  .stats .container{grid-template-columns:repeat(2,1fr);gap:26px 14px}
  .imgrow{grid-template-columns:1fr}
  .page-body{padding:36px 22px 40px}
  .cta-band{padding:36px 28px}
  .ft-top{grid-template-columns:1fr;gap:30px;padding:48px 0 36px}
  .hero h1{font-size:30px}
  .brand-txt .cn{font-size:16.5px}
  table.rel a{flex-direction:column;align-items:flex-start;gap:3px;padding:12px 14px}
}
@media print{
  .site-header,.topbar,.backtop,.cta-band,.tags-bar{display:none}
  body{background:#fff}
}