/* ============================================================
   mnbt2026 — 现代化改版模板  PbootCMS
   ============================================================ */
:root{
  --primary:#1668dc;
  --primary-dark:#0f4faf;
  --accent:#14b8a6;
  --ink:#1a2233;
  --ink-2:#5a6577;
  --ink-3:#8b95a7;
  --bg:#f5f7fa;
  --line:#e6eaf0;
  --white:#fff;
  --radius:14px;
  --shadow:0 10px 30px rgba(16,42,86,.08);
  --shadow-lg:0 18px 50px rgba(16,42,86,.14);
  --max:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);font-size:15px;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .25s}
img{max-width:100%;display:block}
ul,li{list-style:none}
input,textarea,button{font-family:inherit;outline:none}
.clear::after{content:"";display:table;clear:both}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* ---------- 顶部 ---------- */
.nb_top{background:var(--primary-dark);color:#cfe0f7;font-size:13px}
.nb_top .wrap{display:flex;justify-content:space-between;align-items:center;height:36px}
.nb_top a{color:#cfe0f7}
.nb_top a:hover{color:#fff}

/* ---------- 导航（两行式：logo行 + 导航行） ---------- */
.nb_header{position:relative;background:#fff;box-shadow:0 2px 12px rgba(16,42,86,.06)}
.nb_header_top .wrap{display:flex;align-items:center;justify-content:space-between;padding-top:10px;padding-bottom:10px}
.nb_head_flex{display:flex;align-items:center;justify-content:space-between}
.nb_logo{flex-shrink:0}
.nb_logo img{max-height:64px;max-width:520px;width:auto}
.nb_head_right{display:flex;align-items:center;gap:22px}
.nb_hotline{display:flex;align-items:center;gap:10px}
.nb_hotline svg{width:24px;height:24px;stroke:var(--primary);flex-shrink:0}
.nb_hotline span{font-size:18px;font-weight:600;color:var(--primary);line-height:1.3}
.nb_hotline span em{display:block;font-style:normal;font-size:12px;font-weight:400;color:var(--ink-3)}
/* 导航行（新版·亮色卡片风）：白色导航条 + 顶部渐变饰线 */
.nb_nav{display:flex;align-items:center;justify-content:center;flex-wrap:nowrap;white-space:nowrap;background:#fff;border-top:3px solid;border-image:linear-gradient(90deg,var(--primary),var(--accent)) 1;border-bottom:1px solid var(--line)}
.nb_nav.desktop-fixed{position:fixed;top:0;left:0;right:0;z-index:999;border-image:none;border-top:3px solid var(--primary);box-shadow:0 8px 26px rgba(16,42,86,.14)}
.nb_nav>li{position:relative}
.nb_nav>li>a{display:block;padding:17px 16px;font-size:15.5px;font-weight:500;color:var(--ink);position:relative;transition:color .25s}
.nb_nav>li>a:hover,.nb_nav>li>a.nav_on{color:var(--primary)}
.nb_nav>li>a::before{content:"";position:absolute;left:50%;bottom:0;width:0;height:3px;border-radius:3px 3px 0 0;background:linear-gradient(90deg,var(--primary),var(--accent));transform:translateX(-50%);transition:width .3s}
.nb_nav>li>a:hover::before,.nb_nav>li>a.nav_on::before{width:calc(100% - 24px)}
/* 有下级时显示小箭头 */
.nb_nav li.has-sub>a>span{display:inline-block;transition:.25s}
.nb_nav li.has-sub>a>span.caret{display:inline-block;width:0;height:0;margin-left:5px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;vertical-align:middle;opacity:.55}
.nb_nav li.has-sub:hover>a>span.caret{transform:rotate(180deg);opacity:1}
/* 下拉菜单：悬浮卡片式 */
.nb_nav .sub-menu{position:absolute;top:100%;left:50%;margin-left:-8px;min-width:200px;background:#fff;border-radius:14px;box-shadow:0 18px 44px rgba(16,42,86,.16);padding:10px 0;opacity:0;visibility:hidden;transform:translate(-50%,12px);transition:.28s;z-index:100;border:1px solid var(--line)}
.nb_nav .sub-menu::before{content:"";position:absolute;top:-7px;left:0;right:0;height:14px}
.nb_nav li:hover>.sub-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.nb_nav .sub-menu li{position:relative;margin:0 10px}
.nb_nav .sub-menu a{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;font-size:14px;color:var(--ink-2);border-radius:9px;white-space:nowrap;transition:.2s}
.nb_nav .sub-menu a:hover{color:var(--primary);background:linear-gradient(90deg,rgba(22,104,220,.08),rgba(26,188,156,.06));padding-left:20px}
.nb_nav .sub-menu .sub-menu{top:-10px;left:calc(100% + 14px);margin-left:0;transform:translateY(12px)}
.nb_nav .sub-menu li:hover>.sub-menu{transform:translateY(0)}
.nb_tools{display:flex;align-items:center;gap:4px;flex-shrink:0}
.nb_search_btn{width:40px;height:40px;border:1px solid var(--line);background:#fff;cursor:pointer;border-radius:10px;display:flex;align-items:center;justify-content:center;transition:.25s}
.nb_search_btn:hover{border-color:var(--primary);background:rgba(22,104,220,.06)}
.nb_search_btn svg{width:19px;height:19px;stroke:var(--ink-2)}
.nb_header{position:relative}
.nb_search{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-top:1px solid var(--line);box-shadow:0 16px 30px rgba(16,42,86,.14);z-index:998}
.nb_search form{max-width:var(--max);margin:0 auto;padding:14px 20px;display:flex;gap:10px}
.nb_search input[type=text]{flex:1;height:44px;border:1px solid var(--line);border-radius:10px;padding:0 16px;font-size:14px}
.nb_search input[type=text]:focus{border-color:var(--primary)}
.nb_search button{height:44px;padding:0 28px;border:none;border-radius:10px;background:var(--primary);color:#fff;font-size:14px;cursor:pointer}
.nb_search button:hover{background:var(--primary-dark)}
.btn-menu{display:none;width:42px;height:42px;border:none;background:transparent;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;align-items:center}
.btn-menu span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- Banner ---------- */
.nb_banner{position:relative;height:520px;overflow:hidden;background:#0c1b33}
.nb_slide{position:absolute;inset:0;opacity:0;transition:opacity 1s ease;background-size:cover;background-position:center}
.nb_slide:first-child{opacity:1}
.nb_slide.active{opacity:1;z-index:1}
.nb_slide::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(9,26,54,.72) 20%,rgba(9,26,54,.15) 70%)}
.nb_banner_txt{position:absolute;inset:0;z-index:2;display:flex;align-items:center;pointer-events:none}
.nb_banner_txt h2{color:#fff;font-size:44px;font-weight:700;letter-spacing:2px;text-shadow:0 4px 24px rgba(0,0,0,.4)}
.nb_banner_txt p{color:rgba(255,255,255,.85);font-size:17px;margin-top:14px;max-width:560px}
.nb_dots{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:10px}
.nb_dots i{width:26px;height:5px;border-radius:3px;background:rgba(255,255,255,.4);cursor:pointer;transition:.3s}
.nb_dots i.on{background:#fff;width:40px}

/* ---------- 内页Banner ---------- */
.ny_banner{position:relative;height:280px;background-size:cover;background-position:center;background-color:#12305e}
.ny_banner::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,30,64,.55),rgba(10,30,64,.35))}
.ny_banner .ny_banner_in{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;justify-content:center}
.ny_banner h1{color:#fff;font-size:34px;font-weight:700;letter-spacing:1px}
.ny_banner .crumb{color:rgba(255,255,255,.8);font-size:14px;margin-top:10px}
.ny_banner .crumb a{color:rgba(255,255,255,.8)}
.ny_banner .crumb a:hover{color:#fff}

/* ---------- 通用标题 ---------- */
.sec{padding:80px 0}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head .en{font-size:13px;letter-spacing:4px;text-transform:uppercase;color:var(--primary);font-weight:600}
.sec-head h2{font-size:32px;font-weight:700;margin-top:6px}
.sec-head .sub{color:var(--ink-3);margin-top:10px;font-size:15px}
.sec-head .bar{width:46px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--primary),var(--accent));margin:16px auto 0}

/* ---------- 优势 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.adv-card{background:#fff;border-radius:var(--radius);padding:40px 26px;text-align:center;box-shadow:var(--shadow);transition:.35s;border:1px solid transparent}
.adv-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:rgba(22,104,220,.15)}
.adv-card .ico{width:64px;height:64px;margin:0 auto 20px;border-radius:18px;background:linear-gradient(135deg,rgba(22,104,220,.12),rgba(20,184,166,.12));display:flex;align-items:center;justify-content:center}
.adv-card .ico svg{width:30px;height:30px;stroke:var(--primary)}
.adv-card h3{font-size:19px;margin-bottom:8px}
.adv-card p{color:var(--ink-2);font-size:14px}

/* ---------- 产品 ---------- */
.tab-bar{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:36px}
.tab-bar a{padding:8px 22px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:14px}
.tab-bar a:hover,.tab-bar a.on{background:var(--primary);border-color:var(--primary);color:#fff}
.pro-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.pro-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.35s}
.pro-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.pro-card .img{position:relative;padding-top:72%;overflow:hidden;background:#eef2f7}
.pro-card .img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.pro-card:hover .img img{transform:scale(1.06)}
.pro-card .tt{padding:16px 18px;font-size:15px;font-weight:500;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---------- 关于我们 ---------- */
.about-sec{background:#fff}
.about-flex{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-flex .img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg)}
.about-flex h2{font-size:30px;margin-bottom:6px}
.about-flex h2 span{color:var(--ink-3);font-size:15px;font-weight:400;margin-left:10px}
.about-flex p{color:var(--ink-2);margin:18px 0 28px;text-align:justify}
.btn{display:inline-block;padding:12px 32px;border-radius:999px;background:var(--primary);color:#fff;font-size:15px;transition:.3s}
.btn:hover{background:var(--primary-dark);box-shadow:0 8px 20px rgba(22,104,220,.35);color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--primary);color:var(--primary)}
.btn.ghost:hover{background:var(--primary);color:#fff}

/* ---------- 案例(推荐) ---------- */
.case-sec{background:linear-gradient(180deg,#f5f7fa,#eaf1fa)}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:24px}
.news-feat{grid-row:span 1}
.news-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.35s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.news-card .img{padding-top:60%;position:relative;overflow:hidden;background:#eef2f7}
.news-card .img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.news-card:hover .img img{transform:scale(1.06)}
.news-card .bd{padding:20px 22px 24px;flex:1;display:flex;flex-direction:column}
.news-card .bd h3{font-size:17px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card .bd p{color:var(--ink-2);font-size:13.5px;margin-top:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.news-card .bd .date{color:var(--ink-3);font-size:12.5px;margin-top:14px;display:flex;align-items:center;gap:6px}
.news-card .bd .date::before{content:"";width:16px;height:2px;background:var(--accent);border-radius:2px}
.news-list-card{justify-content:center}
.news-list-card .bd h3{font-size:16.5px}
.news-more{text-align:center;margin-top:42px}

/* ---------- CTA / 页脚 ---------- */
.cta{background:linear-gradient(110deg,var(--primary-dark),var(--primary));color:#fff;padding:56px 0}
.cta .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}
.cta h3{font-size:26px}
.cta p{opacity:.85;margin-top:6px}
.cta .btn{background:#fff;color:var(--primary)}
.cta .btn:hover{box-shadow:0 8px 24px rgba(0,0,0,.25)}
.nb_foot{background:#101b2e;color:#8d9ab1;padding:56px 0 0;font-size:14px}
.nb_foot .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:44px}
.nb_foot h4{color:#fff;font-size:17px;margin-bottom:18px}
.nb_foot a:hover{color:#fff}
.nb_foot .links li{margin-bottom:9px}
.nb_foot .contact li{margin-bottom:10px}
.nb_foot_bar{border-top:1px solid rgba(255,255,255,.08);padding:18px 0;text-align:center;font-size:13px;color:#6b7890}
.nb_foot_bar a{color:#6b7890}
.nb_foot_bar a:hover{color:#fff}

/* ---------- 内页通用 ---------- */
.nb_main{padding:60px 0 80px}
.nb_card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:44px 48px}
.rich{color:var(--ink-2);font-size:15px}
.rich img{max-width:100%;height:auto;border-radius:10px;margin:14px 0}
.rich p{margin-bottom:14px}

/* 文章列表 */
.art-list li{border-bottom:1px solid var(--line)}
.art-list a{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 8px;transition:.25s}
.art-list a:hover{background:#fafbfd;padding-left:16px}
.art-list .t{flex:1;min-width:0}
.art-list .t b{display:block;font-size:16.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.art-list .t i{display:block;font-style:normal;color:var(--ink-3);font-size:13.5px;margin-top:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.art-list .d{text-align:center;color:var(--ink-3);font-size:13px;min-width:64px}
.art-list .d span{display:block;font-size:24px;color:var(--primary);font-weight:600;line-height:1.2}
.pager{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:40px}
.pager a,.pager span{min-width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:14px;color:var(--ink-2)}
.pager a:hover{border-color:var(--primary);color:var(--primary)}
.pager span{background:var(--primary);border-color:var(--primary);color:#fff}

/* 文章详情 */
.art-head{text-align:center;padding-bottom:26px;border-bottom:1px solid var(--line);margin-bottom:30px}
.art-head h1{font-size:26px;line-height:1.5}
.art-head .meta{color:var(--ink-3);font-size:13.5px;margin-top:12px}
.art-prev{display:flex;justify-content:space-between;gap:20px;margin-top:34px;padding-top:24px;border-top:1px solid var(--line);color:var(--ink-2);font-size:14px}
.art-prev a:hover{color:var(--primary)}

/* 产品详情 */
.pd-flex{display:grid;grid-template-columns:1fr 1.1fr;gap:44px;align-items:start}
.pd-flex .img{border-radius:var(--radius);overflow:hidden;background:#eef2f7;box-shadow:var(--shadow)}
.pd-flex h1{font-size:26px;margin-bottom:16px}
.pd-flex .desc{color:var(--ink-2);margin:14px 0 26px;text-align:justify}
.pd-btns{display:flex;gap:14px;flex-wrap:wrap}
.side-menu{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:26px}
.side-menu .cap{background:linear-gradient(110deg,var(--primary-dark),var(--primary));color:#fff;padding:15px 22px;font-size:16px;font-weight:600}
.side-menu ul{padding:8px 0}
.side-menu .sm-row{display:flex;align-items:center;justify-content:space-between}
.side-menu .sm-row>a{flex:1;display:block;padding:11px 22px;font-size:14.5px;color:var(--ink-2);border-left:3px solid transparent}
.side-menu .sm-row>a:hover,.side-menu .sm-row>a.on{color:var(--primary);background:rgba(22,104,220,.06);border-left-color:var(--primary)}
.side-menu .sm-toggle{width:34px;height:34px;margin-right:8px;border:none;background:transparent;color:var(--ink-3);font-size:18px;cursor:pointer;border-radius:8px;line-height:1;flex-shrink:0;transition:.25s}
.side-menu .sm-toggle:hover{background:rgba(22,104,220,.08);color:var(--primary)}
.side-menu .sm-sub{padding:2px 0 6px}
.side-menu .sm-sub a{display:block;padding:8px 22px 8px 40px;font-size:13.5px;color:var(--ink-3);border-left:3px solid transparent}
.side-menu .sm-sub a:hover{color:var(--primary);border-left-color:var(--accent)}
/* 微信图标 */
.nb-side .i-wechat{width:24px;height:24px;fill:var(--ink-2);stroke:none;transition:.3s}
.nb-side a:hover .i-wechat,.nb-side .item:hover .i-wechat{fill:#fff}
.tag-title{font-size:21px;font-weight:700;padding-left:14px;border-left:4px solid var(--primary);margin:40px 0 22px}

/* 表单 */
.msg-form{max-width:640px;margin:0 auto}
.msg-form .row{margin-bottom:20px}
.msg-form label{display:block;font-size:14px;font-weight:500;margin-bottom:8px}
.msg-form input[type=text],.msg-form input[type=email],.msg-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-size:14px;transition:.25s;background:#fafbfd}
.msg-form input:focus,.msg-form textarea:focus{border-color:var(--primary);background:#fff}
.msg-form textarea{resize:vertical;min-height:130px}
.msg-form .btns{display:flex;gap:12px}
.msg-form input[type=submit]{padding:12px 40px;border:none;border-radius:999px;background:var(--primary);color:#fff;font-size:15px;cursor:pointer;transition:.3s}
.msg-form input[type=submit]:hover{background:var(--primary-dark)}
.msg-form input[type=reset]{padding:12px 40px;border:none;border-radius:999px;background:#eef1f6;color:var(--ink-2);font-size:15px;cursor:pointer}

/* 联系我们 */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info li{display:flex;gap:14px;margin-bottom:22px;align-items:flex-start}
.contact-info .ico{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,rgba(22,104,220,.12),rgba(20,184,166,.12));display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-info .ico svg{width:20px;height:20px;stroke:var(--primary)}
.contact-info b{display:block;font-size:15px}
.contact-info span{color:var(--ink-2);font-size:14px;word-break:break-all}

/* 悬浮客服 */
.nb-side{position:fixed;right:18px;bottom:110px;z-index:998;display:flex;flex-direction:column;gap:10px}
.nb-side a,.nb-side .item{width:50px;height:50px;border-radius:12px;background:#fff;box-shadow:var(--shadow-lg);display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;transition:.3s}
.nb-side a:hover,.nb-side .item:hover{background:var(--primary)}
.nb-side svg{width:22px;height:22px;stroke:var(--ink-2)}
.nb-side a:hover svg,.nb-side .item:hover svg{stroke:#fff}
.nb-side .pop{position:absolute;right:62px;top:50%;transform:translateY(-50%);background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);padding:14px 18px;white-space:nowrap;display:none;font-size:14px;color:var(--ink)}
.nb-side .item:hover .pop{display:block}

/* 动效 */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .nb_nav>li>a{padding:15px 9px;font-size:14px}
  .nb_logo img{max-height:52px}
}
@media (max-width:1024px){
  .adv-grid,.pro-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:1fr 1fr}
  .about-flex,.pd-flex,.contact-wrap{grid-template-columns:1fr;gap:30px}
  .nb_foot .cols{grid-template-columns:1fr 1fr}
  .nb_hotline span{font-size:15px}
}
@media (max-width:768px){
  .nb_top{display:none}
  .btn-menu{display:flex}
  /* 顶部一行：logo + 搜索 + 汉堡菜单按钮 */
  .nb_logo{flex-shrink:1;min-width:0;overflow:hidden}
  .nb_logo img{max-height:44px;max-width:calc(100vw - 130px);width:auto;height:auto;object-fit:contain}
  .nb_head_right{gap:8px;flex-shrink:0;margin-left:12px}
  .nb_header_top .wrap{padding-top:10px;padding-bottom:10px}
  .nb_hotline{display:none}
  .nb_header_top{position:sticky;top:0;z-index:1002;background:#fff;box-shadow:0 2px 10px rgba(16,42,86,.08)}
  /* 汉堡按钮动画（变 X） */
  .btn-menu.act span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .btn-menu.act span:nth-child(2){opacity:0}
  .btn-menu.act span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  /* 遮罩 */
  .nb_mask{position:fixed;inset:0;z-index:1000;background:rgba(10,24,48,.5);opacity:0;visibility:hidden;transition:.3s}
  .nb_mask.on{opacity:1;visibility:visible}
  /* 手机端抽屉菜单：从右侧滑出，标准手机菜单样式 */
  .nb_nav{position:fixed;top:0;right:0;bottom:0;z-index:1001;display:flex;flex-direction:column;align-items:stretch;gap:0;width:78%;max-width:320px;background:#fff;box-shadow:-12px 0 36px rgba(10,24,48,.2);transform:translateX(105%);transition:transform .32s ease;overflow-y:auto;-webkit-overflow-scrolling:touch;white-space:normal;border-top:none;border-bottom:none;border-image:none;padding:0}
  .nb_nav.open{display:flex;transform:translateX(0)}
  .nb_nav::before{content:"导航菜单";display:block;flex-shrink:0;padding:20px 24px 16px;font-size:16px;font-weight:600;color:#fff;background:linear-gradient(110deg,var(--primary-dark),var(--primary))}
  .nb_nav>li{flex-shrink:0;border-bottom:1px solid #f0f3f8}
  .nb_nav>li>a{padding:15px 24px;font-size:15px;border-radius:0;color:var(--ink);background:transparent;display:flex;align-items:center;justify-content:space-between}
  .nb_nav>li>a::before{display:none}
  .nb_nav>li>a:hover,.nb_nav>li>a.nav_on{color:var(--primary);background:#f6f9fe}
  .nb_nav>li>a:hover::after,.nb_nav>li>a.nav_on::after{display:none}
  .nb_nav>li>a .caret{margin-left:auto}
  .nb_nav.desktop-fixed{display:flex;position:fixed;transform:translateX(105%)}
  .nb_nav.desktop-fixed.open{transform:translateX(0)}
  /* 抽屉内子菜单：缩进静态展开 */
  .nb_nav .sub-menu{position:static;transform:none;opacity:1;visibility:visible;min-width:0;margin:0;border-radius:0;border:none;box-shadow:none;padding:0;background:#f7f9fc;display:none}
  .nb_nav li:hover>.sub-menu{transform:none}
  .nb_nav>li.sub-open>.sub-menu{display:block}
  .nb_nav .sub-menu li{margin:0;border-bottom:1px solid #eef2f8}
  .nb_nav .sub-menu a{padding:12px 24px 12px 40px;font-size:13.5px;color:var(--ink-2);border-radius:0;position:relative}
  .nb_nav .sub-menu a::before{content:"";position:absolute;left:26px;top:50%;width:5px;height:5px;margin-top:-2.5px;border-radius:50%;background:var(--primary)}
  .nb_nav .sub-menu li.sub-open>.sub-menu{display:block}
  /* 手机端不显示三级分类（列表页左侧已有），电脑端不受影响 */
  .nb_nav .sub-menu .sub-menu{display:none!important}
  .nb_nav .sub-menu .sub-menu a{padding-left:56px}
  .nb_nav .sub-menu .sub-menu a::before{left:42px}
  /* 手机端抽屉只显示到二级，三级到列表页侧栏看 */
  .nb_nav .sub-menu .sub-menu{display:none}
  .nb_nav li.sub-open>a>span.caret{transform:rotate(180deg);opacity:1}
  .nb_banner{height:360px}
  .nb_banner_txt h2{font-size:28px}
  .sec{padding:54px 0}
  .sec-head h2{font-size:25px}
  .pro-grid,.adv-grid,.news-grid{grid-template-columns:1fr 1fr}
  .news-grid{grid-template-columns:1fr}
  .ny_banner{height:200px}
  .ny_banner h1{font-size:24px}
  .nb_card{padding:26px 20px}
  .nb_foot .cols{grid-template-columns:1fr}
  .nb-side{display:none}
}
@media (max-width:420px){
  .pro-grid,.adv-grid{grid-template-columns:1fr}
}