/* ===== K连接器中台 · 深色精密仪器风 ===== */
:root{
  --bg:#0a1626;
  --bg-2:#0e1f33;
  --panel:#102a43;
  --panel-2:#14304c;
  --line:#1d3a57;
  --line-soft:#16304a;
  --text:#dbe7f2;
  --muted:#8aa6bf;
  --cyan:#36b0c4;
  --cyan-bright:#5fd6e8;
  --cyan-deep:#1d7e8f;
  --gold:#d8b15a;
  --ok:#3fbf8f;
  --no:#e0715f;
  --radius:14px;
  --maxw:1180px;
  --header-h:64px;
  --h2-inset:0px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
a{color:var(--cyan-bright);text-decoration:none;}
a:hover{color:var(--cyan);}
img{max-width:100%;}
code{font-family:"JetBrains Mono",Consolas,monospace;background:var(--panel-2);
  padding:1px 6px;border-radius:5px;font-size:.9em;color:var(--cyan-bright);}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ===== 顶栏 ===== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:60;
  background:rgba(10,22,38,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);}
.header-inner{max-width:var(--maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:20px;padding:0 24px;}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;
  border:2px solid var(--cyan);border-radius:8px;color:var(--cyan-bright);font-weight:800;}
.brand-text{font-size:17px;letter-spacing:.5px;}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-links>a,.nav-cat>summary{display:inline-flex;align-items:center;padding:8px 12px;border-radius:8px;
  color:var(--muted);font-size:15px;cursor:pointer;list-style:none;user-select:none;}
.nav-links>a:hover,.nav-cat>summary:hover{color:var(--text);background:var(--panel);}
.nav-cat{position:relative;}
.nav-cat>summary{outline:none;}
.caret{width:0;height:0;margin-left:6px;border-left:4px solid transparent;border-right:4px solid transparent;
  border-top:5px solid var(--muted);transition:transform .2s;}
.nav-cat[open]>summary .caret,.nav-cat:hover>summary .caret{transform:rotate(180deg);}
.nav-cat>ul{position:absolute;top:100%;left:0;min-width:180px;margin:0;padding:8px;
  list-style:none;background:var(--panel);border:1px solid var(--line);border-radius:10px;
  box-shadow:0 14px 40px rgba(0,0,0,.45);display:none;z-index:70;}
.nav-cat>ul li a{display:block;padding:8px 10px;border-radius:7px;color:var(--muted);font-size:14px;}
.nav-cat>ul li a:hover{background:var(--panel-2);color:var(--text);}
@media(min-width:1025px){
  .nav-cat:hover>ul{display:block;}
  .nav-cat>ul::before{content:"";position:absolute;left:0;right:0;top:-8px;height:8px;}
}
.nav-toggle{display:none;margin-left:auto;width:42px;height:38px;background:none;border:1px solid var(--line);
  border-radius:9px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;padding:0;}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);margin:0 auto;}

/* ===== 主体 ===== */
main#main{padding-top:var(--header-h);min-height:70vh;}
.breadcrumb{font-size:13.5px;color:var(--muted);margin:22px 0 18px;padding:0;}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:8px;color:var(--line);}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--cyan-bright);}

/* ===== 文章 / 产品 布局 ===== */
.article-layout{padding-bottom:60px;}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 248px;gap:40px;align-items:start;}
.article-main{min-width:0;}
.article-title{font-size:30px;line-height:1.3;margin:0 0 14px;color:#fff;letter-spacing:.3px;}
.article-tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px;}
.tag-text{display:inline-block;font-size:12.5px;color:var(--cyan-bright);
  background:rgba(54,176,196,.12);border:1px solid rgba(54,176,196,.3);
  padding:3px 10px;border-radius:999px;}
.tag-cat{color:var(--muted);background:var(--panel);border-color:var(--line);}
.article-body{font-size:16px;}
.article-body h2{font-size:22px;margin:34px 0 14px;color:#fff;padding-bottom:8px;
  border-bottom:1px solid var(--line);scroll-margin-top:80px;}
.article-body h3{font-size:18px;margin:24px 0 10px;color:var(--cyan-bright);scroll-margin-top:80px;}
.article-body p{margin:0 0 16px;}
.article-body ul{margin:0 0 16px;padding-left:22px;}
.article-body li{margin:6px 0;}
.article-body blockquote{margin:18px 0;padding:14px 18px;background:var(--panel);
  border-left:3px solid var(--cyan);border-radius:0 10px 10px 0;color:var(--text);}
.article-body blockquote.abstract{background:linear-gradient(90deg,rgba(54,176,196,.14),rgba(54,176,196,.03));
  border-left-color:var(--cyan-bright);font-size:16.5px;}
.article-body blockquote.conclusion{border-left-color:var(--gold);background:rgba(216,177,90,.08);}
.article-body table.data{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;
  background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden;}
.article-body table.data th,.article-body table.data td{padding:10px 14px;text-align:left;
  border-bottom:1px solid var(--line-soft);}
.article-body table.data th{background:var(--panel-2);color:var(--cyan-bright);font-weight:600;}
.article-body table.data tr:last-child td{border-bottom:none;}
.article-body time{display:inline-block;font-size:13px;color:var(--muted);margin:6px 0 18px;
  font-family:"JetBrains Mono",monospace;}

/* FAQ */
.faq-section{margin-top:36px;}
.faq-section h2{font-size:22px;color:#fff;margin:0 0 16px;padding-bottom:8px;border-bottom:1px solid var(--line);}
.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin-bottom:10px;overflow:hidden;}
.faq-item>summary{padding:14px 18px;cursor:pointer;font-weight:600;color:var(--text);
  list-style:none;display:flex;align-items:center;gap:10px;}
.faq-item>summary::-webkit-details-marker{display:none;}
.faq-item>summary::before{content:"+";color:var(--cyan-bright);font-size:18px;font-weight:700;}
.faq-item[open]>summary::before{content:"−";}
.faq-a{padding:0 18px 14px;color:var(--muted);}

/* TOC */
.toc-aside{position:sticky;top:calc(var(--header-h) + 16px);align-self:start;}
.toc-panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;}
.toc-panel>summary{cursor:pointer;font-weight:600;color:var(--cyan-bright);list-style:none;
  display:flex;align-items:center;gap:8px;}
.toc-panel>summary::-webkit-details-marker{display:none;}
.toc-panel>summary::after{content:"";margin-left:auto;width:0;height:0;border-left:5px solid transparent;
  border-right:5px solid transparent;border-top:6px solid var(--muted);transition:transform .2s;}
.toc-panel:not([open])>summary::after{transform:rotate(-90deg);}
.toc-list{list-style:none;margin:12px 0 0;padding:0;}
.toc-list li{margin:8px 0;font-size:14px;}
.toc-list a{color:var(--muted);}
.toc-list a:hover{color:var(--cyan-bright);}

/* ===== 列表页 ===== */
.list-layout{padding-bottom:60px;}
.list-grid{display:grid;grid-template-columns:230px minmax(0,1fr);gap:36px;align-items:start;}
.cat-side{position:sticky;top:calc(var(--header-h) + 16px);}
.cat-panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;}
.cat-panel>summary{cursor:pointer;font-weight:600;color:var(--cyan-bright);list-style:none;
  display:flex;align-items:center;gap:8px;outline:none;}
.cat-panel>summary::-webkit-details-marker{display:none;}
.cat-panel>summary::after{content:"";margin-left:auto;width:0;height:0;border-left:5px solid transparent;
  border-right:5px solid transparent;border-top:6px solid var(--muted);transition:transform .2s;}
.cat-panel:not([open])>summary::after{transform:rotate(-90deg);}
.category-list{list-style:none;margin:12px 0 0;padding:0;}
.category-list li{display:flex;align-items:center;justify-content:space-between;
  padding:9px 10px;border-radius:8px;margin:2px 0;}
.category-list li:hover{background:var(--panel-2);}
.category-list li.active{background:rgba(54,176,196,.16);}
.category-list a{color:var(--text);font-size:14.5px;}
.category-list li.active a{color:var(--cyan-bright);font-weight:600;}
.cat-count{font-size:12px;color:var(--muted);background:var(--bg-2);padding:1px 8px;border-radius:999px;}
.list-title{font-size:28px;color:#fff;margin:0 0 10px;}
.cat-desc{color:var(--muted);margin:0 0 22px;}
.item-list{list-style:none;margin:0;padding:0;}
.item-row{padding:18px 0;border-bottom:1px solid var(--line-soft);}
.item-title{font-size:18px;font-weight:600;color:#fff;display:inline-block;margin:6px 0;}
.item-title:hover{color:var(--cyan-bright);}
.item-summary{color:var(--muted);margin:4px 0 0;font-size:14.5px;}

/* ===== 页面（关于/联系等）===== */
.page-wrap{padding-bottom:60px;}
.page-main{max-width:820px;margin:0 auto;}
.page-title{font-size:30px;color:#fff;margin:0 0 22px;}
.page-body h2{font-size:21px;color:#fff;margin:30px 0 12px;border-bottom:1px solid var(--line);padding-bottom:8px;}
.page-body h3{font-size:17px;color:var(--cyan-bright);margin:22px 0 8px;}
.page-body p{margin:0 0 16px;}
.page-body ul{margin:0 0 16px;padding-left:22px;}
.page-body blockquote{background:var(--panel);border-left:3px solid var(--cyan);padding:12px 16px;
  border-radius:0 10px 10px 0;margin:16px 0;}
.notfound{text-align:center;padding:60px 0;}

/* ===== 首页 ===== */
.hero{position:relative;overflow:hidden;padding:90px 0 70px;border-bottom:1px solid var(--line);}
.hero-bg{position:absolute;inset:0;
  background:
    radial-gradient(900px 400px at 80% -10%,rgba(54,176,196,.18),transparent 60%),
    repeating-linear-gradient(115deg,rgba(54,176,196,.05) 0 2px,transparent 2px 26px);}
.hero-inner{position:relative;}
.hero-eyebrow{color:var(--cyan-bright);letter-spacing:2px;font-size:13px;text-transform:uppercase;margin:0 0 12px;}
.hero-title{font-size:46px;line-height:1.15;margin:0 0 14px;color:#fff;letter-spacing:1px;}
.hero-sub{font-size:19px;color:var(--cyan-bright);margin:0 0 18px;font-weight:600;}
.hero-lead{max-width:720px;color:var(--muted);font-size:16px;margin:0 0 28px;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px;transition:.2s;}
.btn-primary{background:linear-gradient(135deg,var(--cyan),var(--cyan-deep));color:#04121c;}
.btn-primary:hover{filter:brightness(1.1);color:#04121c;}
.btn-ghost{border:1px solid var(--line);color:var(--text);}
.btn-ghost:hover{background:var(--panel);}

.section-title{font-size:24px;color:#fff;margin:0 0 22px;}
.block{padding:64px 0;border-bottom:1px solid var(--line-soft);}
.block-alt{background:var(--bg-2);}
.block-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap;gap:10px;}
.more-link{color:var(--cyan-bright);font-size:14px;}

.band{padding:64px 0;background:linear-gradient(180deg,var(--bg),var(--bg-2));border-bottom:1px solid var(--line-soft);}
.band-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.band-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;}
.band-card.ok{border-top:3px solid var(--ok);}
.band-card.no{border-top:3px solid var(--no);}
.band-k{display:block;font-size:18px;font-weight:700;color:#fff;margin-bottom:10px;}
.band-card p{color:var(--muted);margin:0;font-size:14px;}

.cat-card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:34px;}
.cat-card{display:flex;flex-direction:column;gap:8px;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:18px;transition:.2s;}
.cat-card:hover{border-color:var(--cyan);transform:translateY(-3px);}
.cat-card-name{font-size:17px;font-weight:700;color:#fff;}
.cat-card-desc{font-size:13.5px;color:var(--muted);}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.feature-card{display:flex;flex-direction:column;gap:8px;background:var(--panel-2);
  border:1px solid var(--line);border-radius:12px;padding:16px;transition:.2s;}
.feature-card:hover{border-color:var(--cyan);}
.feature-tag{font-size:12px;color:var(--cyan-bright);}
.feature-title{font-size:16px;font-weight:600;color:#fff;}
.feature-sum{font-size:13.5px;color:var(--muted);}
.sol-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:30px;}
.sol-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;}
.sol-card h3{margin:0 0 10px;color:var(--cyan-bright);font-size:17px;}
.sol-card p{color:var(--muted);margin:0;font-size:14px;}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;}

/* ===== 归档 ===== */
.archive-h{font-size:20px;color:#fff;margin:28px 0 12px;border-bottom:1px solid var(--line);padding-bottom:8px;}
.archive-list{list-style:none;margin:0;padding:0;}
.archive-list li{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line-soft);flex-wrap:wrap;}
.archive-date{font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--muted);}

/* ===== 悬浮胶囊 ===== */
.float-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;gap:10px;padding:10px 8px;border-radius:999px;
  background:linear-gradient(160deg,var(--cyan-deep),#0c2c3a);
  box-shadow:0 10px 30px rgba(0,0,0,.5);border:1px solid rgba(95,214,232,.35);}
.cap-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);color:#eaf6fb;cursor:pointer;font-size:11px;transition:.2s;}
.cap-btn:hover{background:var(--cyan);color:#04121c;}
.cap-btn svg{display:block;}

/* 名片弹层 */
.card-modal{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;}
.card-modal[hidden]{display:none;}
.card-modal-backdrop{position:absolute;inset:0;background:rgba(4,12,22,.78);backdrop-filter:blur(3px);}
.card-modal-body{position:relative;background:#fff;border-radius:14px;padding:10px;
  box-shadow:0 20px 60px rgba(0,0,0,.6);}
.card-modal-body img{display:block;border-radius:8px;width:300px;height:500px;object-fit:contain;}
.card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;
  background:var(--panel);color:#fff;border:1px solid var(--line);font-size:20px;cursor:pointer;line-height:1;}

/* ===== 页脚 ===== */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:48px 0 20px;}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;}
.footer-brand .brand-mark{margin-bottom:10px;}
.footer-name{font-weight:700;color:#fff;margin:0 0 6px;}
.footer-sub{color:var(--muted);font-size:14px;margin:0;}
.footer-col h4{color:var(--cyan-bright);font-size:15px;margin:0 0 12px;}
.footer-col ul{list-style:none;margin:0;padding:0;}
.footer-col li{margin:7px 0;}
.footer-col a{color:var(--muted);font-size:14px;}
.footer-col a:hover{color:var(--cyan-bright);}
.footer-bottom{max-width:var(--maxw);margin:30px auto 0;padding:18px 24px 0;border-top:1px solid var(--line);
  color:var(--muted);font-size:13px;text-align:center;}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .nav-toggle{display:flex;}
  .nav-links{position:absolute;top:var(--header-h);right:0;left:0;flex-direction:column;align-items:stretch;
    gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 16px;display:none;}
  .nav-links.open{display:flex;}
  .nav-links>a,.nav-cat>summary{padding:12px 10px;justify-content:space-between;}
  .nav-cat>ul{position:static;display:none;box-shadow:none;border:none;background:var(--panel);margin:0 0 6px;padding:6px;}
  .nav-cat[open]>ul{display:block;}
  .article-grid{grid-template-columns:1fr;gap:24px;}
  .toc-aside{position:static;}
  .list-grid{grid-template-columns:1fr;gap:20px;}
  .cat-side{position:static;}
  .band-grid,.cat-card-grid,.sol-grid{grid-template-columns:repeat(2,1fr);}
  .feature-grid{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .hero-title{font-size:34px;}
}
@media(max-width:560px){
  .band-grid,.cat-card-grid,.sol-grid,.footer-inner{grid-template-columns:1fr;}
  .container{padding:0 16px;}
  .article-title{font-size:24px;}
  .float-capsule{right:10px;}
  .cap-btn{width:48px;height:48px;}
}