/* ============================================================
   钢格板中文官网 · 版式参照 chinasteelgrating.com (EnZar)
   主色 #E02028 · 区块灰 #F1F1F1 · 页脚 #EEEEEE
   ============================================================ */
:root{
  --red:#E02028;
  --red-dark:#C41A21;
  --text:#333333;
  --text-2:#666666;
  --text-3:#999999;
  --bg-gray:#F1F1F1;
  --bg-gray-2:#F7F7F7;
  --footer:#EEEEEE;
  --line:#E3E3E3;
  --ff:"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{font-family:var(--ff);color:var(--text);background:#fff;font-size:15px;line-height:1.7;}
img{display:block;max-width:100%;}
picture{display:contents;}
a{text-decoration:none;color:inherit;transition:color .2s;}
ul{list-style:none;}
.container{width:1200px;max-width:92%;margin:0 auto;}

/* ---------- 顶部细条 ---------- */
.topbar{background:var(--bg-gray-2);border-bottom:1px solid #ECECEC;font-size:12.5px;color:var(--text-2);}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px;}
.topbar .left{display:flex;align-items:center;gap:6px;}
.topbar .left .dot{width:7px;height:7px;border-radius:50%;background:var(--red);}
.topbar .right{display:flex;align-items:center;gap:18px;}
.topbar .right a:hover{color:var(--red);}
.topbar .lang{display:flex;align-items:center;gap:4px;cursor:pointer;}
.topbar .lang b{color:var(--red);}

/* ---------- 主导航 ---------- */
.header{background:#fff;position:sticky;top:0;z-index:100;box-shadow:0 1px 0 rgba(0,0,0,.06);}
.header .container{display:flex;align-items:center;justify-content:space-between;height:86px;}
.logo{display:flex;align-items:center;gap:12px;}
.logo .mark{width:46px;height:46px;background:var(--red);border-radius:4px;color:#fff;font-size:26px;font-weight:800;display:flex;align-items:center;justify-content:center;letter-spacing:-2px;}
.logo .name{line-height:1.15;}
.logo .name .cn{font-size:21px;font-weight:800;color:#222;letter-spacing:1px;}
.logo .name .en{font-size:11px;color:var(--text-3);letter-spacing:.6px;text-transform:uppercase;}
.nav{display:flex;align-items:center;gap:34px;}
.nav > li{position:relative;}
.nav > li > a{display:block;padding:31px 2px;font-size:15.5px;font-weight:600;color:#333;}
.nav > li > a:hover,.nav > li.active > a{color:var(--red);}
.nav > li > a .caret{font-size:10px;color:var(--text-3);margin-left:3px;}
.dropdown{position:absolute;top:100%;left:50%;transform:translateX(-50%);background:#fff;min-width:190px;border-top:2px solid var(--red);box-shadow:0 10px 26px rgba(0,0,0,.12);opacity:0;visibility:hidden;transition:.2s;}
.nav > li:hover .dropdown{opacity:1;visibility:visible;}
.dropdown a{display:block;padding:10px 18px;font-size:14px;color:var(--text-2);border-bottom:1px solid #F2F2F2;}
.dropdown a:hover{color:var(--red);background:#FAFAFA;}
.head-tel{text-align:right;line-height:1.3;}
.head-tel .label{font-size:12px;color:var(--text-3);}
.head-tel .num{font-size:20px;font-weight:800;color:var(--red);}

/* ---------- 首屏轮播 ---------- */
.hero{position:relative;height:560px;overflow:hidden;background:#1A1D21;}
.hero .bg{position:absolute;inset:0;background:#1A1D21 url("../assets/hero.webp") center/cover;}
.hero .bg{background-image:image-set(url("../assets/hero-1280.avif") type("image/avif"),url("../assets/hero.webp") type("image/webp"));}
@media (max-width:992px){.hero .bg{background-image:image-set(url("../assets/hero-1000.avif") type("image/avif"),url("../assets/hero-1000.webp") type("image/webp"));}}
.hero .veil{position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.42),rgba(0,0,0,.08) 55%,rgba(0,0,0,0));}
.hero-card{position:absolute;top:70px;right:calc((100% - 1200px)/2 + 0px);width:470px;background:rgba(255,255,255,.94);padding:42px 44px 30px;border-radius:3px;}
.hero-card .eyebrow{font-size:14px;letter-spacing:2px;color:var(--text-3);text-transform:uppercase;}
.hero-card .eyebrow b{color:var(--red);margin-right:6px;}
.hero-card h1{font-size:34px;line-height:1.32;font-weight:800;color:#222;margin:14px 0 16px;}
.hero-card p{font-size:14.5px;color:var(--text-2);line-height:1.85;margin-bottom:26px;}
.btn{display:inline-block;background:var(--red);color:#fff;font-size:15px;font-weight:700;padding:13px 34px;border-radius:3px;transition:.2s;}
.btn:hover{background:var(--red-dark);color:#fff;}
.hero-dots{position:absolute;bottom:16px;right:44px;display:flex;gap:8px;}
.hero-dots i{width:22px;height:4px;background:rgba(0,0,0,.22);cursor:pointer;}
.hero-dots i.on{background:var(--red);}

/* ---------- 区块通用标题 ---------- */
.sec{padding:72px 0;}
.sec.gray{background:var(--bg-gray);}
.sec-head{text-align:center;margin-bottom:46px;}
.sec-head .eyebrow{font-size:13px;letter-spacing:3px;color:var(--red);font-weight:700;text-transform:uppercase;}
.sec-head h2{font-size:32px;font-weight:800;color:#222;margin-top:8px;letter-spacing:1px;}
.sec-head p{font-size:14.5px;color:var(--text-3);margin-top:10px;}

/* ---------- 品牌介绍（视频位 + 文案） ---------- */
.intro .container{display:flex;gap:56px;align-items:center;}
.intro-media{width:520px;flex:none;position:relative;border-radius:0 70px 0 0;overflow:hidden;}
.intro-media img{width:100%;height:330px;object-fit:cover;}
.intro-media .play{position:absolute;inset:0;margin:auto;width:64px;height:64px;border-radius:50%;background:rgba(224,32,40,.92);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:0 0 0 10px rgba(224,32,40,.25);}
.intro-copy{flex:1;}
.intro-copy .eyebrow{font-size:13px;letter-spacing:3px;color:var(--red);font-weight:700;}
.intro-copy h2{font-size:30px;font-weight:800;color:#222;line-height:1.45;margin:12px 0 18px;}
.intro-copy p{font-size:14.5px;color:var(--text-2);line-height:1.95;margin-bottom:14px;}
.intro-stats{display:flex;gap:46px;margin:26px 0 30px;}
.intro-stats b{display:block;font-size:34px;font-weight:800;color:var(--red);line-height:1.1;}
.intro-stats span{font-size:13px;color:var(--text-3);}

/* ---------- 我们拥有（3 卡片） ---------- */
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.card{background:#fff;border-radius:4px;padding:30px 28px 26px;box-shadow:0 2px 14px rgba(0,0,0,.05);transition:.25s;}
.card:hover{transform:translateY(-6px);box-shadow:0 14px 30px rgba(0,0,0,.10);}
.card h3{font-size:19px;font-weight:800;color:var(--red);margin-bottom:16px;}
.card .pic{margin-bottom:18px;}
.card .pic img{width:100%;height:200px;object-fit:cover;border-radius:3px;}
.card ul li{position:relative;padding:5px 0 5px 18px;font-size:14px;color:var(--text-2);}
.card ul li::before{content:"";position:absolute;left:0;top:13px;width:7px;height:7px;border-radius:50%;background:var(--red);}
.card .more{display:inline-block;margin-top:16px;font-size:14px;font-weight:700;color:var(--red);}
.card .more:hover{color:var(--red-dark);}

/* ---------- 应用场景（圆形图） ---------- */
.apps{display:grid;grid-template-columns:repeat(5,1fr);gap:34px 26px;}
.app{ text-align:center;}
.app .circle{width:170px;height:170px;border-radius:50%;overflow:hidden;margin:0 auto 16px;border:5px solid #F1F1F1;transition:.25s;}
.app:hover .circle{border-color:var(--red);}
.app .circle img{width:100%;height:100%;object-fit:cover;transition:.4s;}
.app:hover .circle img{transform:scale(1.08);}
.app span{font-size:15px;font-weight:600;color:#333;}
.app small{display:block;font-size:12px;color:var(--text-3);}

/* ---------- 为什么选择（大图上压双卡） ---------- */
.why{position:relative;padding:86px 0;background:url("../assets/f_big.webp") center/cover fixed no-repeat;}
.why .veil{position:absolute;inset:0;background:rgba(10,14,18,.35);}
.why .container{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:30px;}
.why-card{background:rgba(255,255,255,.96);border-radius:4px;padding:38px 40px;}
.why-card .eyebrow{font-size:13px;letter-spacing:3px;color:var(--red);font-weight:700;}
.why-card h2{font-size:26px;font-weight:800;color:#222;margin:8px 0 20px;}
.why-card li{display:flex;gap:12px;padding:8px 0;border-bottom:1px dashed #E8E8E8;}
.why-card li:last-child{border-bottom:none;}
.why-card .chk{flex:none;width:20px;height:20px;margin-top:3px;border-radius:50%;background:var(--red);color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;}
.why-card b{font-size:14.5px;color:#222;}
.why-card span{display:block;font-size:13px;color:var(--text-3);line-height:1.6;}

/* ---------- 工程案例 ---------- */
.cases{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.case{position:relative;border-radius:3px;overflow:hidden;cursor:pointer;}
.case img{width:100%;height:230px;object-fit:cover;transition:.4s;}
.case:hover img{transform:scale(1.06);}
.case .bar{position:absolute;left:0;right:0;bottom:0;background:rgba(224,32,40,.94);color:#fff;font-size:14.5px;font-weight:600;padding:12px 16px;}
.case .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0) 55%,rgba(0,0,0,.35));}

/* ---------- 资料中心 ---------- */
.res{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:start;}
.res-list li{background:#fff;border-radius:3px;margin-bottom:12px;box-shadow:0 1px 8px rgba(0,0,0,.04);}
.res-list a{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;font-size:14.5px;font-weight:600;color:#333;}
.res-list a::after{content:"›";color:var(--red);font-size:22px;line-height:1;}
.res-list a:hover{color:var(--red);}
.res-table{width:100%;border-collapse:collapse;background:#fff;border-radius:3px;overflow:hidden;box-shadow:0 1px 8px rgba(0,0,0,.04);}
.res-table th{background:var(--red);color:#fff;font-size:15px;font-weight:700;text-align:left;padding:13px 20px;}
.res-table td{padding:12px 20px;font-size:13.5px;color:var(--text-2);border-bottom:1px solid #F0F0F0;}
.res-table td:first-child{font-weight:700;color:#333;white-space:nowrap;}
.res-table tr:last-child td{border-bottom:none;}

/* ---------- 客户评价 ---------- */
.review{max-width:860px;margin:0 auto;text-align:center;}
.review .quote{font-size:110px;line-height:.6;color:var(--red);font-family:Georgia,serif;}
.review p{font-size:19px;color:#333;line-height:1.9;margin:26px 0 22px;font-weight:500;}
.review .stars{color:var(--red);font-size:18px;letter-spacing:4px;}
.review .who{margin-top:12px;font-size:14px;color:var(--text-3);}
.review .who b{color:#333;}
.review-dots{display:flex;justify-content:center;gap:8px;margin-top:28px;}
.review-dots i{width:10px;height:10px;border-radius:50%;background:#DDD;cursor:pointer;}
.review-dots i.on{background:var(--red);}

/* ---------- 页脚 ---------- */
.footer{background:var(--footer);padding:56px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:50px;padding-bottom:40px;}
.footer h4{font-size:16px;font-weight:800;color:#222;margin-bottom:18px;position:relative;padding-bottom:10px;}
.footer h4::after{content:"";position:absolute;left:0;bottom:0;width:30px;height:2px;background:var(--red);}
.footer .about p{font-size:13.5px;color:var(--text-2);line-height:1.9;margin:14px 0 18px;}
.certs{display:flex;gap:10px;}
.certs span{font-size:11.5px;color:var(--text-2);border:1px solid #D5D5D5;border-radius:2px;padding:4px 10px;background:#fff;}
.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 24px;}
.footer-links a{display:block;padding:5px 0 5px 16px;font-size:13.5px;color:var(--text-2);position:relative;}
.footer-links a::before{content:"›";position:absolute;left:0;color:var(--red);font-weight:700;}
.footer-links a:hover{color:var(--red);}
.contact li{display:flex;gap:10px;padding:6px 0;font-size:13.5px;color:var(--text-2);}
.contact .ic{color:var(--red);font-weight:800;}
.copyright{border-top:1px solid #DDD;padding:18px 0;text-align:center;font-size:12.5px;color:var(--text-3);}

/* ---------- 右侧固定留言 ---------- */
.side-tab{position:fixed;right:0;top:52%;z-index:99;background:var(--red);color:#fff;writing-mode:vertical-rl;letter-spacing:4px;padding:22px 12px;font-size:14px;border-radius:4px 0 0 4px;box-shadow:-4px 4px 14px rgba(224,32,40,.35);}
.side-tab:hover{background:var(--red-dark);color:#fff;}

/* ---------- 响应式 ---------- */
@media (max-width:1240px){
  .hero-card{right:4%;}
}
@media (max-width:992px){
  .nav{display:none;}
  .hero-card{position:relative;top:0;right:0;margin:60px auto;width:92%;}
  .hero{height:auto;padding:40px 0;}
  .intro .container{flex-direction:column;}
  .cards3,.cases,.apps{grid-template-columns:repeat(2,1fr);}
  .why .container{grid-template-columns:1fr;}
  .res{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
}

/* ============================================================
   子页面（集合页 / 栏目页）
   ============================================================ */
.page-hero{position:relative;height:320px;background:#20262C center/cover;display:flex;align-items:flex-end;overflow:hidden;}
.page-hero .veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,14,18,.25),rgba(10,14,18,.62));}
.page-hero .container{position:relative;padding-bottom:34px;}
.crumbs{font-size:13px;color:rgba(255,255,255,.75);margin-bottom:10px;}
.crumbs a{color:rgba(255,255,255,.85);}
.crumbs a:hover{color:#fff;}
.crumbs .cur{color:#fff;font-weight:600;}
.page-hero h1{color:#fff;font-size:34px;font-weight:800;letter-spacing:1px;}
.page-hero .sub{color:rgba(255,255,255,.82);font-size:14.5px;margin-top:8px;}

/* 概述：左文右图 */
.overview{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;}
.overview .eyebrow{font-size:13px;letter-spacing:3px;color:var(--red);font-weight:700;}
.overview h2{font-size:28px;font-weight:800;color:#222;margin:10px 0 16px;}
.overview p{font-size:14.5px;color:var(--text-2);line-height:1.95;margin-bottom:10px;}
.overview .pic img{width:100%;height:340px;object-fit:cover;border-radius:4px;box-shadow:0 10px 28px rgba(0,0,0,.12);}
.kw-note{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.kw-note span{font-size:12.5px;color:var(--text-2);background:var(--bg-gray);border-radius:999px;padding:5px 14px;}

/* 规格表 */
.spec-table{width:100%;border-collapse:collapse;background:#fff;box-shadow:0 1px 8px rgba(0,0,0,.05);}
.spec-table th{background:var(--red);color:#fff;font-size:15px;text-align:left;padding:13px 20px;width:190px;}
.spec-table td{padding:12px 20px;font-size:14px;color:var(--text-2);border-bottom:1px solid #F0F0F0;}
.spec-table tr:last-child td{border-bottom:none;}

/* 子系列卡片 */
.variants{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.variant{background:#fff;border:1px solid #ECECEC;border-radius:4px;overflow:hidden;transition:.25s;}
.variant:hover{box-shadow:0 12px 26px rgba(0,0,0,.10);transform:translateY(-5px);}
.variant img{width:100%;height:190px;object-fit:cover;}
.variant .pad{padding:20px 22px 22px;}
.variant h3{font-size:17px;font-weight:800;color:#222;margin-bottom:8px;}
.variant p{font-size:13.5px;color:var(--text-2);line-height:1.8;}

/* 特性网格 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.feat{display:flex;gap:14px;background:#fff;border:1px solid #ECECEC;border-radius:4px;padding:20px 22px;}
.feat .chk{flex:none;width:26px;height:26px;border-radius:50%;background:var(--red);color:#fff;font-size:13px;display:flex;align-items:center;justify-content:center;margin-top:2px;}
.feat b{font-size:15px;color:#222;display:block;margin-bottom:4px;}
.feat span{font-size:13px;color:var(--text-3);line-height:1.7;}

/* 应用词 chips */
.chips{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.chips a{font-size:14px;color:var(--text-2);background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 22px;transition:.2s;}
.chips a:hover{color:#fff;background:var(--red);border-color:var(--red);}

/* FAQ */
.faq{max-width:860px;margin:0 auto;}
.faq details{background:#fff;border:1px solid #ECECEC;border-radius:4px;margin-bottom:12px;padding:0 24px;}
.faq summary{padding:17px 0;font-size:15.5px;font-weight:700;color:#222;cursor:pointer;list-style:none;position:relative;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";position:absolute;right:2px;top:14px;color:var(--red);font-size:20px;font-weight:800;}
.faq details[open] summary::after{content:"−";}
.faq details p{padding:0 0 18px;font-size:14px;color:var(--text-2);line-height:1.9;}

/* 相关推荐 */
.related{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.rel-card{display:block;border:1px solid #ECECEC;border-radius:4px;overflow:hidden;background:#fff;transition:.25s;}
.rel-card:hover{box-shadow:0 10px 24px rgba(0,0,0,.10);transform:translateY(-4px);}
.rel-card img{width:100%;height:130px;object-fit:cover;}
.rel-card b{display:block;padding:13px 16px 3px;font-size:15px;color:#222;}
.rel-card small{display:block;padding:0 16px 14px;font-size:12.5px;color:var(--text-3);}

/* CTA 横带 */
.cta-band{background:linear-gradient(115deg,#C41A21,#E02028 55%,#F04148);padding:56px 0;}
.cta-band .container{display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;}
.cta-band h2{color:#fff;font-size:26px;font-weight:800;}
.cta-band p{color:rgba(255,255,255,.85);font-size:14px;margin-top:6px;}
.cta-band .btn{background:#fff;color:var(--red);font-size:15.5px;padding:15px 40px;}
.cta-band .btn:hover{background:#FFE8E9;}

/* 图集 */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.gallery img{width:100%;height:210px;object-fit:cover;border-radius:4px;}

/* 产品中心卡片 */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.cat-card{background:#fff;border:1px solid #ECECEC;border-radius:4px;overflow:hidden;transition:.25s;display:block;}
.cat-card:hover{box-shadow:0 14px 30px rgba(0,0,0,.10);transform:translateY(-5px);}
.cat-card img{width:100%;height:185px;object-fit:cover;}
.cat-card .pad{padding:18px 20px 20px;}
.cat-card h3{font-size:17.5px;font-weight:800;color:#222;}
.cat-card:hover h3{color:var(--red);}
.cat-card p{font-size:13px;color:var(--text-3);margin-top:6px;line-height:1.7;}

/* 应用领域页 */
.app-list{display:grid;grid-template-columns:repeat(4,1fr);gap:30px 26px;}

/* 新闻列表 */
.news-list{max-width:880px;margin:0 auto;}
.news-item{display:block;background:#fff;border:1px solid #ECECEC;border-radius:4px;padding:20px 26px;margin-bottom:14px;transition:.2s;}
.news-item:hover{box-shadow:0 8px 20px rgba(0,0,0,.08);}
.news-item b{font-size:16px;color:#222;}
.news-item:hover b{color:var(--red);}
.news-item p{font-size:13.5px;color:var(--text-3);margin-top:6px;}

/* 联系页 */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start;}
.form label{display:block;font-size:13.5px;font-weight:700;color:#333;margin:14px 0 6px;}
.form input,.form textarea,.form select{width:100%;border:1px solid #DDD;border-radius:3px;padding:11px 14px;font-size:14px;font-family:var(--ff);color:#333;}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--red);}
.form .btn{border:none;cursor:pointer;margin-top:20px;}
.contact-info li{display:flex;gap:12px;padding:10px 0;font-size:14.5px;color:var(--text-2);border-bottom:1px dashed #E8E8E8;}
.contact-info .ic{color:var(--red);font-weight:800;}

@media (max-width:992px){
  .overview,.contact-wrap{grid-template-columns:1fr;}
  .variants,.feat-grid,.cat-grid,.related,.app-list,.gallery{grid-template-columns:repeat(2,1fr);}
  .page-hero{height:260px;}
}

/* ---------- 悬浮快捷联系 / 微信二维码 ---------- */
.side-fabs{position:fixed;right:0;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:10px;z-index:99;}
.side-fabs .side-tab{position:static;}
.side-tab.wx{background:#1AAD19;box-shadow:-4px 4px 14px rgba(26,171,25,.35);}
.side-tab.wx:hover{background:#179b15;}
.btn.ghost{background:#fff;color:var(--red);border:1px solid var(--red);}
.btn.ghost:hover{background:#fff5f5;color:var(--red-dark);}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap;}
.qr-card{background:#fff;border:1px solid #EEE;border-radius:6px;padding:28px 24px;text-align:center;box-shadow:0 6px 24px rgba(0,0,0,.06);max-width:420px;}
.qr-card img{width:240px;height:240px;display:block;margin:0 auto 14px;border:1px solid #F0F0F0;border-radius:4px;}
.qr-card .wx-id{font-size:19px;font-weight:800;color:#222;letter-spacing:.5px;}
.qr-card .tip{font-size:13px;color:var(--text-3);margin:8px 0 4px;line-height:1.7;}
.qr-card .btn{margin-top:12px;}
.tel-link{color:var(--red);font-weight:800;font-size:16px;}
@media (max-width:992px){.side-fabs{top:auto;bottom:18px;transform:none;flex-direction:row;right:12px;}.side-fabs .side-tab{writing-mode:horizontal-tb;border-radius:4px;padding:12px 18px;letter-spacing:2px;}}

/* ---------- 助攻页（技术指南 / 应用场景） ---------- */
a.app{display:block;text-decoration:none;color:inherit;}
.article{max-width:900px;margin:0 auto;}
.article .lead{font-size:16px;line-height:1.95;color:#444;margin-bottom:14px;}
.article h2{font-size:22px;font-weight:800;color:#1A1A1A;margin:0 0 14px;padding-left:12px;border-left:4px solid var(--red);}
.article p{font-size:15.5px;line-height:1.95;color:var(--text-2);margin-bottom:14px;}
.article .spec-table{margin:18px 0 6px;}
.chk-list{list-style:none;margin:6px 0 8px;}
.chk-list li{position:relative;padding-left:24px;font-size:15px;line-height:1.9;color:var(--text-2);}
.chk-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--red);font-weight:800;}
.guide-links{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:980px;margin:0 auto;}
.guide-link{display:block;background:#fff;border:1px solid #EEE;border-left:4px solid var(--red);border-radius:4px;padding:18px 22px;text-decoration:none;transition:.2s;}
.guide-link:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);transform:translateY(-2px);}
.guide-link b{display:block;font-size:16px;color:#1F2328;margin-bottom:6px;}
.guide-link span{font-size:13.5px;color:var(--text-3);line-height:1.7;}
.footer-topics{border-top:1px solid #E2E2E2;margin-top:34px;padding:18px 0 4px;display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;}
.footer-topics b{font-size:13px;color:#333;}
.footer-topics a{font-size:13px;color:var(--text-2);}
.footer-topics a:hover{color:var(--red);}
.sitemap{display:grid;grid-template-columns:repeat(2,1fr);gap:26px 50px;}
.map-group h3{font-size:17px;font-weight:800;color:#1A1A1A;margin-bottom:10px;padding-bottom:8px;border-bottom:2px solid var(--red);display:inline-block;}
.map-list{list-style:none;display:grid;grid-template-columns:1fr;gap:6px;}
.map-list li{display:flex;gap:12px;align-items:baseline;font-size:14px;}
.map-list a{color:#1F2328;font-weight:600;white-space:nowrap;}
.map-list a:hover{color:var(--red);}
.map-list span{color:var(--text-3);font-size:12.5px;}
@media (max-width:992px){.guide-links,.sitemap{grid-template-columns:1fr;}.article p{font-size:15px;}}

/* ---------- 图集页 ---------- */
.gal-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.gal-item{position:relative;display:block;overflow:hidden;border-radius:4px;background:#111;text-decoration:none;}
.gal-item img{width:100%;height:200px;object-fit:cover;display:block;transition:transform .45s ease;}
.gal-item span{position:absolute;left:0;right:0;bottom:0;padding:22px 12px 10px;font-size:13px;color:#fff;
 background:linear-gradient(180deg,rgba(0,0,0,0),rgba(0,0,0,.78));letter-spacing:.3px;}
.gal-item:hover img{transform:scale(1.06);}
.tbl-note{font-size:13px;color:var(--text-3);margin:6px 0 0;line-height:1.75;}
@media (max-width:1240px){.gal-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:992px){.gal-grid{grid-template-columns:repeat(2,1fr);}.gal-item img{height:160px;}}

/* ---------- 技术文章聚合索引 ---------- */
.art-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:1080px;margin:0 auto;}
.art-card{position:relative;display:block;background:#fff;border:1px solid #EDEDED;border-radius:5px;
 padding:24px 26px 22px 28px;text-decoration:none;transition:.22s;border-left:4px solid var(--red);}
.art-card:hover{box-shadow:0 10px 28px rgba(0,0,0,.09);transform:translateY(-2px);}
.art-card .tag{display:inline-block;font-size:11.5px;color:var(--red);background:#FDF0F1;border:1px solid #F7D7DA;
 padding:2px 9px;border-radius:2px;letter-spacing:.5px;margin-bottom:11px;}
.art-card b{display:block;font-size:17.5px;font-weight:800;color:#1A1A1A;line-height:1.45;margin-bottom:8px;}
.art-card p{font-size:13.8px;color:var(--text-3);line-height:1.75;margin:0 0 12px;}
.art-card i{font-style:normal;font-size:13px;color:var(--red);font-weight:700;}
.art-card:hover b{color:var(--red);}
@media (max-width:992px){.art-grid{grid-template-columns:1fr;}.art-card{padding:20px 20px 18px 22px;}}

/* ---------- 集合页：相关技术文章列表 ---------- */
.art-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.art-row{display:flex;align-items:flex-start;gap:14px;background:#fff;border:1px solid #EEE;border-radius:4px;
 padding:18px 20px;text-decoration:none;transition:.2s;}
.art-row:hover{border-color:#F3C7CB;box-shadow:0 8px 22px rgba(0,0,0,.07);transform:translateY(-1px);}
.art-row .tag{flex:0 0 auto;font-size:11px;color:var(--red);background:#FDF0F1;border:1px solid #F7D7DA;
 padding:2px 7px;border-radius:2px;line-height:1.7;margin-top:2px;}
.art-row .txt{flex:1;}
.art-row b{display:block;font-size:15.5px;color:#1F2328;line-height:1.5;margin-bottom:5px;}
.art-row p{font-size:12.8px;color:var(--text-3);line-height:1.65;margin:0;}
.art-row i{font-style:normal;color:#C9CDD2;font-size:15px;transition:.2s;}
.art-row:hover i{color:var(--red);}
.art-row:hover b{color:var(--red);}
/* 正文上下文内链 */
.article a.inlink{color:var(--red);font-weight:600;border-bottom:1px dashed rgba(224,32,40,.45);text-decoration:none;padding:0 1px;}
.article a.inlink:hover{background:#FDF0F1;border-bottom-style:solid;}
@media (max-width:992px){.art-list{grid-template-columns:1fr;}}

/* 文章收尾提示 */
.article .art-note{margin-top:22px;padding:14px 18px;background:#FAFAFA;border-left:3px solid var(--red);
 font-size:14.5px;line-height:1.9;color:var(--text-2);border-radius:0 3px 3px 0;}

/* ============ 微信二维码弹窗（桌面端点击微信触发） ============ */
.wx-modal{position:fixed;inset:0;background:rgba(0,0,0,.58);z-index:9999;display:none;align-items:center;justify-content:center;padding:20px;}
.wx-modal.on{display:flex;}
.wx-box{position:relative;width:352px;max-width:100%;background:#fff;border-radius:10px;padding:26px 24px 22px;text-align:center;box-shadow:0 24px 70px rgba(0,0,0,.32);animation:wxIn .24s cubic-bezier(.2,.8,.3,1);}
@keyframes wxIn{from{opacity:0;transform:translateY(14px) scale(.97);}to{opacity:1;transform:none;}}
.wx-close{position:absolute;right:12px;top:8px;font-size:24px;line-height:1;color:#bbb;cursor:pointer;font-weight:400;}
.wx-close:hover{color:var(--red);}
.wx-hd{display:flex;gap:10px;align-items:flex-start;text-align:left;margin-bottom:16px;padding-right:14px;}
.wx-ic{flex:none;width:34px;height:34px;border-radius:8px;background:#07C160;color:#fff;font-size:15px;display:flex;align-items:center;justify-content:center;font-weight:700;}
.wx-hd b{display:block;font-size:16px;color:#1a1a1a;line-height:1.4;}
.wx-hd p{font-size:12px;color:var(--text-3);line-height:1.6;margin-top:4px;}
.wx-qr-wrap{background:#FAFAFA;border:1px solid #EFEFEF;border-radius:6px;padding:12px;}
.wx-qr-img{width:216px;height:216px;object-fit:cover;display:block;margin:0 auto;border-radius:2px;}
.wx-qr-tip{display:none;font-size:13px;color:var(--text-3);line-height:1.7;padding:60px 10px;}
.wx-id{font-size:13px;color:var(--text-2);margin:14px 0;}
.wx-id b{color:var(--red);font-size:17px;letter-spacing:.4px;margin-left:2px;}
.wx-acts{display:flex;gap:10px;}
.wx-btn{flex:1;display:block;padding:10px 0;border:1px solid var(--line);border-radius:4px;font-size:13.5px;color:#444;text-decoration:none;transition:.18s;}
.wx-btn:hover{border-color:var(--red);color:var(--red);}
.wx-btn.primary{background:var(--red);border-color:var(--red);color:#fff;}
.wx-btn.primary:hover{background:var(--red-dark);border-color:var(--red-dark);color:#fff;}
.wx-toast{position:fixed;left:50%;bottom:64px;transform:translate(-50%,10px);background:rgba(28,28,30,.94);color:#fff;font-size:13.5px;padding:11px 20px;border-radius:6px;z-index:10000;opacity:0;transition:.24s;pointer-events:none;max-width:88%;text-align:center;}
.wx-toast.on{opacity:1;transform:translate(-50%,0);}
@media (max-width:640px){.wx-box{width:100%;padding:22px 18px 18px;}.wx-qr-img{width:200px;height:200px;}}

/* ---------- 桌面端：电话咨询常显号码 + 点击复制 ---------- */
.side-tab.tel{position:relative;cursor:pointer;}
.side-tab.tel .tel-num{position:absolute;right:100%;top:50%;transform:translateY(-50%);writing-mode:horizontal-tb;background:#fff;color:var(--red);font-size:15px;font-weight:800;letter-spacing:.6px;padding:9px 13px;border:1px solid #F3D6D8;border-right:0;border-radius:4px 0 0 4px;box-shadow:-4px 4px 14px rgba(0,0,0,.10);white-space:nowrap;line-height:1;transition:.18s;}
.side-tab.tel:hover{background:var(--red-dark);}
.side-tab.tel:hover .tel-num{background:var(--red);color:#fff;border-color:var(--red);}
@media (max-width:992px){.side-tab.tel .tel-num{display:none;}}

/* ---------- 桌面端：电话弹窗 ---------- */
.tel-box{padding-top:26px;}
.tel-box .tel-ic{background:var(--red);font-size:17px;}
.tel-big{font-size:33px;font-weight:800;color:var(--red);letter-spacing:1.6px;line-height:1.1;margin:4px 0 10px;font-variant-numeric:tabular-nums;}
.tel-note{font-size:12.5px;color:var(--text-3);line-height:1.6;margin-bottom:18px;}

/* ---------- 移动端导航（2026-11-06 SEO 审计 P0-2） ---------- */
.menu-btn{display:none;background:none;border:1px solid #DDD;border-radius:4px;font-size:18px;line-height:1;padding:9px 13px;color:#333;cursor:pointer;}
@media (max-width:992px){
  .menu-btn{display:inline-block;margin-left:12px;}
  .header .container{position:relative;}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 20px 16px;box-shadow:0 12px 24px rgba(0,0,0,.14);z-index:98;max-height:72vh;overflow:auto;}
  .nav.open{display:flex;}
  .nav > li > a{padding:12px 2px;border-bottom:1px solid #F2F2F2;font-size:15px;}
  .dropdown{position:static;transform:none;opacity:1;visibility:visible;display:none;box-shadow:none;border-top:none;min-width:0;background:#FAFAFA;}
  .nav > li:hover .dropdown{display:none;}
  .nav > li.expanded .dropdown{display:block;}
}