/* ==========================================================
   tnc.同轴连接器.公司 · 商业科技风主题
   深海军蓝 + 信号青 + 规格条带，无模板占位
   ========================================================== */
:root{
  --bg:#0A1220; --bg2:#0E1830; --panel:#111D36; --panel2:#15243F;
  --line:#23385C; --line-soft:#1B2C4C;
  --txt:#E8F0FB; --txt2:#A9BCD8; --txt3:#6E85A8;
  --cyan:#22D3EE; --cyan-soft:rgba(34,211,238,.12);
  --indigo:#818CF8; --amber:#F5B85C;
  --radius:14px; --wrap:1200px;
  --font:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  --mono:"Cascadia Code","JetBrains Mono",Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--txt);font-family:var(--font);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased}
h1,h2,h3,p,li,td,th{overflow-wrap:anywhere;word-break:break-word}
img{max-width:100%}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
code{font-family:var(--mono);background:var(--panel);border:1px solid var(--line-soft);border-radius:6px;padding:.1em .4em;font-size:.9em}

/* ---------- 头部 ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,18,32,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}
.header-inner{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:12px;color:var(--txt)}
.brand:hover{text-decoration:none}
.brand-mark{width:36px;height:36px;flex:none}
.brand-txt{display:flex;flex-direction:column;line-height:1.25}
.brand-txt strong{font-size:17px;letter-spacing:.02em}
.brand-txt small{font-family:var(--mono);font-size:11px;color:var(--cyan);letter-spacing:.04em}
.site-nav{margin-left:auto;display:flex;gap:26px}
.site-nav a{color:var(--txt2);font-size:15px;padding:6px 2px;border-bottom:2px solid transparent}
.site-nav a:hover{color:var(--txt);text-decoration:none}
.site-nav a[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--txt);margin:5px 0;border-radius:2px}

/* ---------- 首屏 ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(900px 420px at 85% -10%,rgba(34,211,238,.14),transparent 60%),
  radial-gradient(700px 380px at -10% 110%,rgba(129,140,248,.12),transparent 60%),
  linear-gradient(180deg,var(--bg2),var(--bg));border-bottom:1px solid var(--line-soft)}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(35,56,92,.16) 1px,transparent 1px),linear-gradient(90deg,rgba(35,56,92,.16) 1px,transparent 1px);background-size:56px 56px;mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 75%);pointer-events:none}
.hero-inner{position:relative;z-index:1;padding:88px 24px 64px;max-width:var(--wrap);margin:0 auto}
.hero-kicker{display:inline-block;font-family:var(--mono);font-size:13px;color:var(--cyan);border:1px solid var(--line);background:var(--cyan-soft);border-radius:999px;padding:4px 14px;margin:0 0 18px;letter-spacing:.08em}
.hero h1{font-size:40px;line-height:1.3;margin:0 0 18px;max-width:860px}
.hero-sub{color:var(--txt2);max-width:820px;font-size:16.5px;margin:0 0 28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:10px;padding:11px 26px;font-size:15px;border:1px solid transparent;cursor:pointer}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--cyan);color:#06222B;font-weight:600}
.btn-primary:hover{background:#5FE6F8}
.btn-ghost{border-color:var(--line);color:var(--txt)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.hero-specs{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:0;margin:0}
.hero-specs li{background:rgba(17,29,54,.7);border:1px solid var(--line-soft);border-radius:var(--radius);padding:18px 20px}
.hero-specs strong{display:block;font-family:var(--mono);font-size:24px;color:var(--cyan);margin-bottom:6px}
.hero-specs span{color:var(--txt3);font-size:13px;line-height:1.5;display:block}

/* ---------- 区块 ---------- */
.section{padding:72px 0}
.section-alt{background:var(--bg2);border-block:1px solid var(--line-soft)}
.sec-title{font-size:28px;margin:0 0 8px;position:relative;padding-left:16px}
.sec-title::before{content:"";position:absolute;left:0;top:.32em;bottom:.32em;width:4px;border-radius:2px;background:linear-gradient(180deg,var(--cyan),var(--indigo))}
.sec-sub{color:var(--txt2);margin:0 0 32px;padding-left:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.p-line-card,.a-card{display:flex;flex-direction:column;gap:10px;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:24px;color:var(--txt);transition:border-color .2s,transform .2s}
.p-line-card:hover,.a-card:hover{text-decoration:none;border-color:var(--cyan);transform:translateY(-3px)}
.p-line-card h3,.a-card h3{margin:0;font-size:18px}
.p-line-card p,.a-card p{margin:0;color:var(--txt2);font-size:14px;flex:1}
.card-more{font-size:13px;color:var(--cyan)}
.a-tag{display:inline-block;font-size:12px;color:var(--cyan);background:var(--cyan-soft);border:1px solid var(--line-soft);border-radius:6px;padding:2px 10px;font-family:var(--mono)}
.edge-card{border-radius:var(--radius);padding:26px;border:1px solid var(--line-soft)}
.edge-card h3{margin:0 0 14px;font-size:19px}
.edge-card ul{margin:0;padding-left:20px;color:var(--txt2);font-size:14.5px}
.edge-card li{margin:8px 0}
.edge-do{background:linear-gradient(180deg,rgba(34,211,238,.07),var(--panel));border-color:rgba(34,211,238,.35)}
.edge-do h3{color:var(--cyan)}
.edge-no{background:var(--panel)}
.edge-no h3{color:var(--amber)}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line-soft);border-radius:var(--radius);margin:20px 0}
table.data{width:100%;border-collapse:collapse;font-size:14px;min-width:560px}
table.data th{background:var(--panel2);color:var(--cyan);text-align:left;font-weight:600;white-space:nowrap}
table.data th,table.data td{padding:12px 16px;border-bottom:1px solid var(--line-soft)}
table.data tbody tr:nth-child(even){background:rgba(21,36,63,.5)}
table.data tbody tr:last-child td{border-bottom:0}

/* ---------- 列表页 ---------- */
.list-page{padding:48px 24px}
.list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px}
.cat-side-title{font-family:var(--mono);font-size:12px;color:var(--txt3);letter-spacing:.1em;margin:22px 0 10px}
.cat-side-title:first-child{margin-top:0}
ul.category-list{list-style:none;margin:0 0 8px;padding:0}
.category-list li{margin:2px 0}
.category-list a{display:block;color:var(--txt2);font-size:14.5px;padding:8px 14px;border-radius:9px;border-left:2px solid transparent}
.category-list a:hover{background:var(--panel);color:var(--txt);text-decoration:none}
.category-list a.active{background:var(--cyan-soft);border-left-color:var(--cyan);color:var(--cyan)}
.cat-content h1{margin:0 0 8px;font-size:30px}
.cat-desc{color:var(--txt2);margin:0 0 30px}
.art-list{display:flex;flex-direction:column;gap:16px}
.art-item{display:block;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:22px 24px;color:var(--txt)}
.art-item:hover{text-decoration:none;border-color:var(--cyan)}
.art-item h2{margin:10px 0 8px;font-size:19px}
.art-item p{margin:0;color:var(--txt2);font-size:14.5px}
.prod-list{display:flex;flex-direction:column;gap:16px}
.prod-item{display:block;background:var(--panel);border:1px solid var(--line-soft);border-radius:var(--radius);padding:22px 24px;color:var(--txt)}
.prod-item:hover{text-decoration:none;border-color:var(--cyan)}
.prod-item-head{display:flex;align-items:center;gap:12px}
.prod-item h2{margin:0;font-size:19px;flex:1}
.prod-item>p{color:var(--txt2);font-size:14.5px;margin:8px 0 12px}
.prod-params{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:6px 24px}
.prod-params li{display:flex;gap:10px;font-size:13px;font-family:var(--mono);color:var(--txt2);border-top:1px dashed var(--line-soft);padding-top:6px}
.prod-params li span{color:var(--txt3);flex:none}

/* ---------- 详情页 ---------- */
.detail{padding:40px 24px 72px}
.detail-layout{display:grid;grid-template-columns:minmax(0,760px) 240px;gap:40px;justify-content:center}
.breadcrumb{margin-bottom:22px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:13.5px;color:var(--txt3)}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:6px;color:var(--line)}
.breadcrumb a{color:var(--txt3)}
.breadcrumb a:hover{color:var(--cyan)}
.article-head{margin-bottom:26px}
.article-title{font-size:34px;line-height:1.35;margin:12px 0}
.article-lead{color:var(--txt2);font-size:16px;border-left:3px solid var(--cyan);padding-left:14px;margin:0 0 14px}
.article-meta{color:var(--txt3);font-size:13.5px;font-family:var(--mono);margin:0 0 10px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.toc-aside{position:sticky;top:84px;max-height:calc(100vh - 110px);overflow-y:auto;align-self:start}
.toc{border:1px solid var(--line-soft);border-radius:var(--radius);padding:18px;background:var(--panel)}
.toc-title{font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--txt3);margin:0 0 10px}
.toc ul{list-style:none;margin:0;padding:0}
.toc a{display:block;color:var(--txt2);font-size:13.5px;padding:5px 8px;border-left:2px solid var(--line-soft)}
.toc a:hover{color:var(--cyan);border-left-color:var(--cyan);text-decoration:none}

/* ---------- 正文 ---------- */
.prose{font-size:15.5px;color:#D5E1F2}
.prose h2{font-size:23px;margin:40px 0 14px;padding-left:12px;border-left:4px solid var(--cyan);scroll-margin-top:84px}
.prose h3{font-size:18px;margin:28px 0 10px;color:var(--txt);scroll-margin-top:84px}
.prose p{margin:12px 0}
.prose ul,.prose ol{padding-left:24px;margin:12px 0}
.prose li{margin:6px 0}
.prose blockquote{margin:18px 0;padding:14px 18px;background:var(--panel);border-left:4px solid var(--indigo);border-radius:0 10px 10px 0;color:var(--txt2)}
.prose blockquote p{margin:0}
.faq-block h2{margin-top:44px}
.prose details{border:1px solid var(--line-soft);border-radius:10px;background:var(--panel);margin:10px 0;padding:0}
.prose details summary{cursor:pointer;padding:13px 18px;font-weight:600;color:var(--txt);list-style:none;position:relative;padding-right:40px}
.prose details summary::-webkit-details-marker{display:none}
.prose details summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--cyan);font-size:18px}
.prose details[open] summary::after{content:"−"}
.prose details p{padding:0 18px 14px;margin:0;color:var(--txt2)}
.page-prose{max-width:820px;margin:0 auto}

/* ---------- 归档 / 404 ---------- */
.archive-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.archive-list{list-style:none;padding:0;margin:0}
.archive-list li{padding:7px 0;border-bottom:1px dashed var(--line-soft);font-size:14.5px}
.archive-list a{color:var(--txt2)}
.archive-list a:hover{color:var(--cyan)}
.notfound{padding:110px 24px;text-align:center}
.nf-code{font-family:var(--mono);font-size:88px;color:var(--cyan);margin:0;line-height:1}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:60px;border-top:1px solid var(--line-soft);background:var(--bg2)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:40px;padding:44px 24px 28px}
.footer-name{display:flex;align-items:baseline;gap:12px;margin:0 0 10px}
.footer-name strong{font-size:19px}
.footer-name span{font-family:var(--mono);font-size:13px;color:var(--txt3)}
.footer-desc{color:var(--txt2);font-size:13.5px;margin:0 0 12px}
.footer-org{color:var(--txt3);font-size:13px;margin:0}
.footer-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 24px;align-content:start}
.footer-nav a{color:var(--txt2);font-size:14px}
.footer-beian{border-top:1px solid var(--line-soft)}
.beian-row{display:flex;flex-wrap:wrap;gap:8px 28px;justify-content:center;padding:14px 24px}
.beian-item{display:inline-flex;align-items:center;gap:7px;color:var(--txt3);font-size:13px}
.beian-item:hover{color:var(--cyan);text-decoration:none}
.beian-ico{width:16px;height:16px;flex:none}
.beian-ico-img{width:18px;height:20px}

/* ---------- 中部胶囊（企业微信名片 / 回到顶部） ---------- */
.side-capsule{position:fixed;right:14px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px}
.capsule{display:flex;flex-direction:column;align-items:center;gap:6px;width:64px;padding:12px 4px 10px;border-radius:999px;border:1px solid var(--line);background:rgba(17,29,54,.92);color:var(--txt2);cursor:pointer;box-shadow:0 8px 24px rgba(2,8,20,.45);transition:border-color .2s,color .2s,transform .2s}
.capsule:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
.capsule-ico{width:24px;height:24px;flex:none}
.capsule-txt{font-size:12px;line-height:1.35;text-align:center}
.capsule-wechat{color:var(--cyan);border-color:rgba(34,211,238,.5)}
.capsule-wechat .capsule-ico{width:28px;height:28px}
.capsule-top{opacity:1;transition:opacity .25s}
.capsule-top[hidden]{display:none}

/* ---------- 名片弹层 ---------- */
.wechat-modal{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;padding:20px}
.wechat-modal[hidden]{display:none}
.wechat-modal-mask{position:absolute;inset:0;background:rgba(4,9,20,.78);backdrop-filter:blur(4px)}
.wechat-modal-body{position:relative;z-index:1;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:0 24px 64px rgba(0,0,0,.55);max-width:calc(100vw - 40px)}
.wechat-card-img{display:block;width:300px;height:500px;max-width:calc(100vw - 76px);max-height:calc(100vh - 160px);object-fit:contain;border-radius:10px;background:#fff}
.wechat-modal-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--panel2);color:var(--txt);font-size:19px;cursor:pointer;line-height:1}
.wechat-modal-close:hover{border-color:var(--cyan);color:var(--cyan)}
.wechat-modal-tip{margin:12px 0 0;font-size:13px;color:var(--txt2);text-align:center}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .detail-layout{grid-template-columns:minmax(0,1fr)}
  .toc-aside{display:none}
  .list-layout{grid-template-columns:minmax(0,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:32px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .archive-grid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .hero-inner{padding:56px 20px 44px}
  .hero h1{font-size:24px}
  .hero-specs{grid-template-columns:repeat(2,1fr)}
  .grid-4,.grid-3,.grid-2{grid-template-columns:minmax(0,1fr)}
  .prod-params{grid-template-columns:minmax(0,1fr)}
  .article-title{font-size:22px}
  .sec-title{font-size:22px}
  .side-capsule{right:8px}
  .capsule{width:56px;padding:9px 2px 8px}
  .capsule-txt{font-size:11px}
  .site-nav{position:fixed;top:64px;left:0;right:0;flex-direction:column;gap:0;background:var(--bg2);border-bottom:1px solid var(--line-soft);padding:8px 0;transform:translateY(-8px);opacity:0;pointer-events:none;transition:.2s}
  .site-nav.open{transform:none;opacity:1;pointer-events:auto}
  .site-nav a{padding:13px 24px;border-bottom:0}
  .nav-toggle{display:block}
  .header-inner{gap:14px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
}