/* ============================================================
   satellite.天线.中国 — 设计系统
   简约大气 · 专业科技感 · 纯静态
   ============================================================ */

:root{
  --bg:           #f6f8fb;
  --bg-soft:      #eef2f7;
  --surface:      #ffffff;
  --ink:          #0e1726;
  --ink-2:        #3a4a5e;
  --ink-3:        #6b7a8d;
  --line:         #e2e8f0;
  --line-soft:    #eef1f6;
  --navy:         #0b1f3a;
  --navy-2:       #11294b;
  --brand:        #0ea5b7;   /* cyan-teal */
  --brand-2:      #16c2c9;
  --brand-deep:   #0b7e8c;
  --accent:       #2563eb;
  --gold:         #c9a227;
  --ok:           #16a34a;
  --warn:         #d97706;
  --radius:       14px;
  --radius-sm:    10px;
  --shadow:       0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
  --shadow-lg:    0 12px 40px rgba(11,31,58,.14);
  --maxw:         1180px;
  --font:         "Inter","Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:         "JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:var(--brand-deep);text-decoration:none;transition:color .15s;}
a:hover{color:var(--accent);}
img{max-width:100%;display:block;}
h1,h2,h3,h4{color:var(--navy);line-height:1.25;font-weight:700;letter-spacing:-.01em;}
h1{font-size:clamp(28px,4vw,42px);}
h2{font-size:clamp(22px,2.6vw,30px);margin-top:0;}
h3{font-size:20px;}
p{margin:.7em 0;color:var(--ink-2);}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,.82);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;height:66px;}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--navy);font-size:18px;letter-spacing:-.02em;}
.brand .logo{
  width:34px;height:34px;border-radius:9px;flex:none;
  background:radial-gradient(120% 120% at 30% 20%,var(--brand-2),var(--brand-deep));
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.25), 0 4px 14px rgba(14,165,183,.35);
  position:relative;
}
.brand .logo::before{content:"";position:absolute;inset:9px;border:2px solid rgba(255,255,255,.85);border-radius:50%;}
.brand .logo::after{content:"";position:absolute;left:50%;top:6px;width:2px;height:22px;background:rgba(255,255,255,.85);transform:translateX(-50%) rotate(20deg);}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--ink-3);letter-spacing:.04em;}
.nav{display:flex;align-items:center;gap:4px;}
.nav a{padding:9px 13px;border-radius:9px;color:var(--ink-2);font-weight:600;font-size:14.5px;}
.nav a:hover{background:var(--bg-soft);color:var(--navy);}
.nav a.cta{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#fff;box-shadow:0 6px 18px rgba(14,165,183,.35);}
.nav a.cta:hover{color:#fff;filter:brightness(1.05);}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:9px;width:42px;height:38px;font-size:18px;cursor:pointer;color:var(--navy);}

/* ---------- 通用区块 ---------- */
.section{padding:72px 0;}
.section.soft{background:var(--surface);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);}
.section-head{max-width:720px;margin:0 auto 40px;text-align:center;}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand-deep);background:rgba(14,165,183,.1);padding:5px 12px;border-radius:999px;margin-bottom:14px;}
.section-head p{color:var(--ink-3);}
.lead{font-size:18px;color:var(--ink-2);}

/* ---------- 首页 Hero ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(900px 500px at 85% -10%,rgba(22,194,201,.18),transparent 60%),
  radial-gradient(700px 400px at 0% 110%,rgba(37,99,235,.12),transparent 55%),
  linear-gradient(180deg,var(--navy),var(--navy-2));
  color:#eaf2ff;
}
.hero::after{content:"";position:absolute;inset:0;background-image:
  linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;mask-image:radial-gradient(circle at 70% 30%,#000,transparent 75%);opacity:.5;}
.hero .container{position:relative;z-index:2;padding:96px 22px 104px;}
.hero h1{color:#fff;font-size:clamp(30px,4.6vw,52px);max-width:16em;}
.hero .sub{font-size:18px;color:#b9cbe6;max-width:42em;margin-top:18px;}
.hero .pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.hero .pills span{font-size:13px;color:#cfe0f5;border:1px solid rgba(255,255,255,.18);padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.04);}
.hero .actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:11px;font-weight:700;font-size:15px;cursor:pointer;border:1px solid transparent;}
.btn-primary{background:linear-gradient(135deg,var(--brand-2),var(--brand-deep));color:#04222a;box-shadow:0 10px 30px rgba(22,194,201,.35);}
.btn-primary:hover{color:#04222a;filter:brightness(1.04);}
.btn-ghost{background:rgba(255,255,255,.06);color:#eaf2ff;border-color:rgba(255,255,255,.22);}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff;}

/* 指标条 */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:54px;}
.metrics .m{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:18px 20px;}
.metrics .m b{display:block;font-size:26px;color:#fff;font-family:var(--mono);letter-spacing:-.02em;}
.metrics .m span{font-size:13px;color:#b9cbe6;}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:22px;}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-2{grid-template-columns:repeat(2,1fr);}
.grid.cols-4{grid-template-columns:repeat(4,1fr);}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s,border-color .18s;}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#cfe9ec;}
.card .kicker{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-deep);}
.card h3{margin:10px 0 8px;font-size:19px;}
.card p{font-size:14.5px;margin:0;}
.card .more{display:inline-block;margin-top:14px;font-weight:700;font-size:14px;color:var(--brand-deep);}
.card .ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(22,194,201,.18),rgba(14,165,183,.28));color:var(--brand-deep);font-size:20px;margin-bottom:14px;}

/* 业务线特色卡 */
.line-card{position:relative;overflow:hidden;}
.line-card .no{position:absolute;right:16px;top:10px;font-family:var(--mono);font-size:40px;color:var(--line-soft);font-weight:800;}

/* ---------- 文章/产品详情布局 ---------- */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:40px;align-items:start;}
.doc{max-width:760px;}
.doc .body h2{margin-top:38px;padding-top:8px;border-top:1px solid var(--line-soft);scroll-margin-top:84px;}
.doc .body h2:first-of-type{border-top:none;}
.doc .body h3{margin-top:26px;scroll-margin-top:84px;}
.doc .body table{border-collapse:collapse;width:100%;margin:18px 0;font-size:14.5px;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden;}
.doc .body th,.doc .body td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top;}
.doc .body th{background:var(--bg-soft);color:var(--navy);font-weight:700;}
.doc .body code{font-family:var(--mono);font-size:13.5px;background:var(--bg-soft);padding:2px 6px;border-radius:6px;color:var(--brand-deep);}
.doc .body ul,.doc .body ol{padding-left:1.3em;}
.doc .body li{margin:.35em 0;}
.callout{border-left:4px solid var(--brand);background:linear-gradient(90deg,rgba(14,165,183,.08),transparent);padding:14px 18px;border-radius:0 10px 10px 0;margin:20px 0;color:var(--ink);}
.callout.practice{border-left-color:var(--gold);background:linear-gradient(90deg,rgba(201,162,39,.1),transparent);}
.callout b{color:var(--navy);}

/* 摘要块 */
.abstract{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px;color:var(--ink-2);font-size:15.5px;border-left:4px solid var(--accent);}
.kwline{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 4px;}
.kwline .tag-text{font-size:12.5px;background:var(--bg-soft);border:1px solid var(--line);color:var(--ink-2);padding:4px 10px;border-radius:999px;}
.updated{font-size:13px;color:var(--ink-3);margin:10px 0;}

/* 面包屑 */
.breadcrumb{padding:16px 0 0;font-size:13.5px;color:var(--ink-3);}
.breadcrumb a{color:var(--ink-3);}
.breadcrumb a:hover{color:var(--brand-deep);}
.breadcrumb span.sep{margin:0 8px;opacity:.6;}

/* 目录 TOC */
.toc-aside{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 104px);overflow:auto;}
.toc-aside .box{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px;}
.toc-aside h4{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin:0 0 10px;}
.toc-aside ol{margin:0;padding-left:1.1em;font-size:14px;}
.toc-aside ol li{margin:7px 0;}
.toc-aside a{color:var(--ink-2);}
.toc-aside a:hover{color:var(--brand-deep);}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:12px;background:var(--surface);margin:12px 0;overflow:hidden;}
.faq summary{cursor:pointer;padding:15px 18px;font-weight:700;color:var(--navy);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";font-size:20px;color:var(--brand-deep);font-weight:700;}
.faq details[open] summary::after{content:"−";}
.faq .ans{padding:0 18px 16px;color:var(--ink-2);font-size:15px;}

/* 分类侧栏（列表页） */
.cat-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:34px;align-items:start;}
.cat-side{position:sticky;top:84px;}
.cat-side h4{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin:0 0 10px;}
.category-list{list-style:none;margin:0;padding:0;}
.category-list li{margin:2px 0;}
.category-list a{display:block;padding:10px 13px;border-radius:9px;color:var(--ink-2);font-weight:600;font-size:14.5px;border:1px solid transparent;}
.category-list a:hover{background:var(--bg-soft);color:var(--navy);}
.category-list a.active{background:linear-gradient(135deg,rgba(22,194,201,.16),rgba(14,165,183,.22));color:var(--navy-2);border-color:#cfe9ec;}
.cat-content h2{margin-top:0;}
.cat-content .list-item{display:block;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:14px 0;box-shadow:var(--shadow);transition:border-color .15s,transform .15s;}
.cat-content .list-item:hover{border-color:#cfe9ec;transform:translateY(-2px);}
.cat-content .list-item h3{margin:0 0 6px;font-size:18px;}
.cat-content .list-item .meta{font-size:13px;color:var(--ink-3);margin-bottom:6px;}
.cat-content .list-item p{margin:0;font-size:14.5px;}

/* 产品参数表 */
.spec-table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 14px;text-align:left;}
.spec-table th{background:var(--bg-soft);width:34%;color:var(--navy);font-weight:700;}
.spec-table td{font-family:var(--mono);color:var(--ink);}

/* 相关阅读/相关产品 */
.related{margin-top:46px;border-top:1px solid var(--line);padding-top:26px;}
.related h3{font-size:18px;margin-bottom:14px;}
.related a{display:block;padding:13px 16px;border:1px solid var(--line);border-radius:11px;margin:10px 0;background:var(--surface);color:var(--ink-2);}
.related a:hover{border-color:#cfe9ec;color:var(--navy);}
.related a b{color:var(--navy);display:block;}
.related a span{font-size:13.5px;color:var(--ink-3);}

/* 页脚 */
.site-footer{background:var(--navy);color:#c5d3e6;padding:54px 0 30px;margin-top:0;}
.site-footer a{color:#cfe0f5;}
.site-footer a:hover{color:#fff;}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;}
.foot-grid h5{color:#fff;font-size:14px;margin:0 0 14px;letter-spacing:.04em;}
.foot-grid ul{list-style:none;margin:0;padding:0;}
.foot-grid li{margin:8px 0;font-size:14px;}
.foot-about p{color:#9fb3cf;font-size:14px;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:20px;font-size:13px;color:#8ba0bf;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}

/* ---------- 底部广告条（引流，可关闭，刷新重现） ---------- */
.adbar{position:fixed;left:0;right:0;bottom:0;z-index:80;background:linear-gradient(90deg,#06223f,#0b3a52);color:#eaf6ff;border-top:1px solid rgba(34,211,238,.4);box-shadow:0 -8px 30px rgba(0,0,0,.25);}
.adbar .inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:16px;padding:11px 22px;}
.adbar .tag{font-size:11px;font-weight:800;letter-spacing:.08em;background:rgba(34,211,238,.18);color:#7ff0ff;padding:4px 9px;border-radius:6px;flex:none;}
.adbar .txt{flex:1;font-size:14px;}
.adbar .txt b{color:#fff;}
.adbar a.go{background:linear-gradient(135deg,#22d3ee,#0ea5b7);color:#042029;font-weight:800;padding:9px 18px;border-radius:9px;font-size:14px;white-space:nowrap;}
.adbar a.go:hover{color:#042029;filter:brightness(1.06);}
.adbar .x{background:none;border:none;color:#9fc4dd;font-size:22px;cursor:pointer;line-height:1;padding:4px 8px;}
.adbar .x:hover{color:#fff;}
body.has-adbar{padding-bottom:58px;}
@media (max-width:680px){body.has-adbar{padding-bottom:110px;}}

/* ---------- 右侧悬浮：企业微信名片 + 一键到顶 ---------- */
.float-rail{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;display:flex;flex-direction:column;gap:12px;align-items:center;}
.float-btn{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;cursor:pointer;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-lg);color:var(--navy);font-size:22px;transition:transform .15s,border-color .15s;}
.float-btn:hover{transform:scale(1.06);border-color:var(--brand);}
.float-btn small{position:absolute;right:56px;background:var(--navy);color:#fff;font-size:12px;padding:5px 10px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transform:translateX(6px);transition:.15s;font-family:var(--font);}
.float-btn:hover small{opacity:1;transform:translateX(0);}
.float-btn.wechat{background:linear-gradient(135deg,#1aad19,#0e8f0d);color:#fff;border-color:transparent;}
.float-btn.top{opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s,transform .15s;}
.float-btn.top.show{opacity:1;visibility:visible;}

/* 名片弹层 */
.wx-modal{position:fixed;inset:0;z-index:90;background:rgba(6,18,34,.55);display:none;align-items:center;justify-content:center;padding:20px;}
.wx-modal.open{display:flex;}
.wx-modal .panel{background:#fff;border-radius:16px;padding:18px;max-width:340px;box-shadow:var(--shadow-lg);text-align:center;}
.wx-modal .panel img{border-radius:10px;width:100%;}
.wx-modal .panel p{font-size:13px;color:var(--ink-3);margin:12px 0 0;}
.wx-modal .closex{position:absolute;top:18px;right:22px;color:#fff;font-size:30px;cursor:pointer;background:none;border:none;}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .grid.cols-3,.grid.cols-4{grid-template-columns:repeat(2,1fr);}
  .layout{grid-template-columns:1fr;}
  .toc-aside{display:none;}
  .cat-layout{grid-template-columns:1fr;}
  .cat-side{position:static;}
  .metrics{grid-template-columns:repeat(2,1fr);}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:680px){
  .nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:10px;gap:2px;}
  .nav.open{display:flex;}
  .nav-toggle{display:block;}
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr;}
  .metrics{grid-template-columns:1fr 1fr;}
  .foot-grid{grid-template-columns:1fr;}
  .section{padding:54px 0;}
  .hero .container{padding:72px 22px 80px;}
  .adbar .inner{flex-wrap:wrap;gap:10px;padding:10px 16px;}
  .adbar .tag{display:none;}
}