/* coax.低损耗电缆.中国 —— 独立设计系统（coax- 前缀，与任何子站零复用） */
:root{
  --bg:#0B1026;
  --bg-2:#0E1430;
  --surface:#121A38;
  --surface-2:#182149;
  --accent:#8B5CF6;      /* 信号紫 */
  --accent-2:#E0A458;    /* 铜金 */
  --line:#2A3358;
  --line-soft:#1E2647;
  --text:#E8ECF6;
  --text-dim:#9AA6C8;
  --text-mute:#6B769C;
  --ok:#36D39A;
  --warn:#F2B544;
  --radius:14px;
  --radius-sm:9px;
  --h2-inset:16px;       /* 面包屑与 H2 左缘对齐基准（详情/列表/文章=16px） */
  --nav-h:62px;
  --maxw:1200px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--sans);font-size:16px;line-height:1.75;
  padding-top:var(--nav-h);-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;}
a:hover{color:var(--accent-2);}
img{max-width:100%;}
h1,h2,h3,h4{line-height:1.3;font-weight:700;}
h1{font-size:30px;margin:0 0 14px;}
h2{font-size:23px;margin:34px 0 14px;color:#fff;
   border-left:4px solid var(--accent);padding-left:12px;}
h3{font-size:19px;margin:24px 0 10px;color:#EDEFFB;}
p{margin:0 0 14px;}
ul,ol{margin:0 0 14px;padding-left:22px;}
li{margin:6px 0;}

/* ===== 顶部固定导航 ===== */
.coax-nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:50;
  background:rgba(11,16,38,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);}
.coax-nav-inner{max-width:var(--maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:18px;padding:0 18px;}
.coax-logo{font-weight:800;font-size:18px;color:#fff;white-space:nowrap;}
.coax-logo b{color:var(--accent);}
.coax-logo span{color:var(--accent-2);}
.coax-nav-menu{display:flex;align-items:center;gap:4px;margin-left:auto;flex-wrap:wrap;}
.coax-nav-menu a{color:var(--text-dim);padding:8px 11px;border-radius:8px;font-size:14px;}
.coax-nav-menu a:hover,.coax-nav-menu a.active{color:#fff;background:var(--surface-2);}
.coax-nav-toggle{display:none;margin-left:auto;background:var(--surface-2);color:#fff;
  border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:14px;cursor:pointer;}

/* ===== 容器与面包屑对齐 ===== */
.coax-container{max-width:var(--maxw);margin:0 auto;padding:0 18px;}
.coax-breadcrumb{padding:18px 0 4px;font-size:13px;color:var(--text-mute);
  padding-left:var(--h2-inset);}
.coax-breadcrumb a{color:var(--text-dim);}
.coax-breadcrumb a:hover{color:var(--accent-2);}
.coax-breadcrumb .sep{margin:0 7px;color:var(--text-mute);}
.coax-breadcrumb .cur{color:var(--text);}

/* ===== 首页 hero ===== */
.coax-hero{position:relative;overflow:hidden;border-radius:var(--radius);
  background:radial-gradient(1100px 420px at 78% -10%,rgba(139,92,246,.30),transparent 60%),
             radial-gradient(700px 360px at 5% 120%,rgba(224,164,88,.18),transparent 55%),
             var(--surface);
  border:1px solid var(--line);padding:46px 38px;margin:18px 0 26px;}
.coax-hero h1{font-size:38px;color:#fff;margin-bottom:14px;}
.coax-hero h1 b{color:var(--accent);}
.coax-hero p{color:var(--text-dim);max-width:760px;font-size:16px;}
.coax-hero-tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px;}
.coax-hero-tags span{background:var(--surface-2);border:1px solid var(--line);
  color:var(--text-dim);border-radius:999px;padding:6px 13px;font-size:13px;}
.coax-hero-cta{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap;}
.coax-btn{display:inline-block;background:linear-gradient(135deg,var(--accent),#6d3fd1);
  color:#fff;padding:11px 20px;border-radius:10px;font-weight:600;font-size:14px;
  border:1px solid rgba(255,255,255,.12);}
.coax-btn:hover{color:#fff;filter:brightness(1.08);}
.coax-btn.ghost{background:transparent;border:1px solid var(--accent);color:var(--accent);}

/* ===== 区块标题 ===== */
.coax-section{margin:30px 0;}
.coax-section h2.coax-sec-title{border-left:4px solid var(--accent-2);color:#fff;
  font-size:22px;margin:0 0 16px;}
.coax-grid-cards{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));}
.coax-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;transition:transform .15s,border-color .15s;}
.coax-card:hover{transform:translateY(-3px);border-color:var(--accent);}
.coax-card h3{margin:0 0 8px;font-size:17px;}
.coax-card h3 a{color:#fff;}
.coax-card p{color:var(--text-dim);font-size:14px;margin:0;}
.coax-card .coax-cat-tag{display:inline-block;font-size:12px;color:var(--accent-2);
  border:1px solid var(--line);border-radius:6px;padding:2px 8px;margin-bottom:10px;}

/* ===== 详情页栅格（内容在前，TOC 在后） ===== */
.coax-detail-layout .coax-layout-grid{
  display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:34px;
  align-items:start;padding:8px 0 40px;}
.coax-content-main{padding-left:var(--h2-inset);min-width:0;}
.coax-content-main h2:first-child{margin-top:6px;}

/* ===== 列表/分类页栅格（侧栏在前，内容在后） ===== */
.coax-list-layout .coax-layout-grid{
  display:grid;grid-template-columns:240px minmax(0,1fr);gap:30px;
  align-items:start;padding:8px 0 40px;}

/* ===== 分类侧栏（原生 details 折叠） ===== */
.coax-cat-side{position:sticky;top:calc(var(--nav-h) + 14px);}
.coax-cat-panel{background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;}
.coax-cat-panel>summary,.coax-toc-panel>summary{list-style:none;cursor:pointer;
  padding:13px 16px;font-weight:600;color:#fff;background:var(--surface-2);
  display:flex;align-items:center;justify-content:space-between;font-size:15px;}
.coax-cat-panel>summary::-webkit-details-marker{display:none;}
.coax-cat-panel>summary::after,.coax-toc-panel>summary::after{content:"▾";
  transition:transform .2s;color:var(--accent);}
.coax-cat-panel[open]>summary::after,.coax-toc-panel[open]>summary::after{transform:rotate(180deg);}
.coax-category-list{list-style:none;margin:0;padding:8px 10px 12px;}
.coax-category-list li{margin:2px 0;}
.coax-category-list a{display:block;padding:8px 12px;border-radius:8px;color:var(--text-dim);font-size:14px;}
.coax-category-list a:hover,.coax-category-list a.active{background:var(--surface-2);color:#fff;}
.coax-cat-content .coax-cat-head{margin-bottom:16px;}
.coax-cat-content .coax-cat-head h1{font-size:26px;color:#fff;}
.coax-cat-content .coax-cat-head p{color:var(--text-dim);}
.coax-list-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;margin-bottom:14px;}
.coax-list-item h3{margin:0 0 6px;font-size:17px;}
.coax-list-item h3 a{color:#fff;}
.coax-list-item p{color:var(--text-dim);font-size:14px;margin:0 0 8px;}
.coax-list-item .coax-meta{font-size:12px;color:var(--text-mute);}

/* ===== 详情页目录（原生 details 折叠，sticky） ===== */
.coax-toc-aside{position:sticky;top:calc(var(--nav-h) + 14px);
  max-height:calc(100vh - var(--nav-h) - 30px);overflow-y:auto;}
.coax-toc-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);}
.coax-toc-panel>summary{padding:12px 16px;}
.coax-toc-list{list-style:none;margin:0;padding:6px 14px 14px;counter-reset:toc;}
.coax-toc-list li{margin:3px 0;font-size:13px;counter-increment:toc;}
.coax-toc-list li a{color:var(--text-dim);display:block;padding:5px 8px;border-radius:7px;}
.coax-toc-list li a:hover{background:var(--surface-2);color:#fff;}

/* ===== 表格（覆盖 markdown 裸 table + coax-spec） ===== */
.coax-content-main table,table.coax-spec{width:100%;border-collapse:collapse;
  margin:14px 0 18px;font-size:14px;background:var(--surface);}
.coax-content-main table th,.coax-content-main table td,
table.coax-spec th,table.coax-spec td{border:1px solid #cbd5e1;padding:9px 12px;text-align:left;}
.coax-content-main table th,table.coax-spec th{background:var(--accent);color:#fff;font-weight:600;}
.coax-content-main table tbody tr:nth-child(even),
table.coax-spec tbody tr:nth-child(even){background:var(--surface-2);}

/* ===== 结论块 / 摘要块 ===== */
.coax-concl{border-left:4px solid var(--accent-2);background:var(--surface);
  border:1px solid var(--line);border-left:4px solid var(--accent-2);
  border-radius:10px;padding:14px 18px;margin:18px 0;color:var(--text);}
.coax-concl p{margin:6px 0;}
.coax-summary{background:linear-gradient(135deg,rgba(139,92,246,.12),rgba(224,164,88,.08));
  border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:0 0 18px;color:var(--text);}
.coax-keywords{font-size:13px;color:var(--text-dim);margin:0 0 18px;}
.coax-keywords b{color:var(--accent-2);}
.coax-update{font-size:12px;color:var(--text-mute);margin:0 0 16px;}

/* ===== FAQ（裸 details） ===== */
.coax-faq{margin:22px 0;display:grid;gap:10px;}
.coax-faq details{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:0;}
.coax-faq details>summary{list-style:none;cursor:pointer;padding:13px 16px;font-weight:600;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:15px;}
.coax-faq details>summary::-webkit-details-marker{display:none;}
.coax-faq details>summary::after{content:"+";color:var(--accent);font-size:18px;}
.coax-faq details[open]>summary::after{content:"–";}
.coax-faq details .coax-faq-a{padding:0 16px 14px;color:var(--text-dim);}

/* ===== 标签 ===== */
.coax-tag{display:inline-block;background:var(--surface-2);border:1px solid var(--line);
  color:var(--text-dim);border-radius:6px;padding:2px 9px;font-size:12px;margin:2px 4px 2px 0;}
.coax-tag-text{display:inline-block;}

/* ===== 相关阅读 / 相关产品 ===== */
.coax-related{margin:26px 0;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:16px 20px;}
.coax-related h2{border-left:none;padding:0;color:#fff;font-size:19px;margin:0 0 12px;}
.coax-related ul{margin:0;padding-left:20px;}
.coax-related li{margin:7px 0;color:var(--text-dim);}
.coax-related li b{color:var(--accent-2);}

/* ===== 页面卡片（about/contact/privacy/services/solutions） ===== */
.coax-page-wrap{--h2-inset:48px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:34px 48px;margin:18px 0 40px;}
.coax-page-wrap h1{color:#fff;}
.coax-page-wrap .coax-breadcrumb{padding-left:0;margin-top:0;padding-top:0;}
.coax-page-main{padding-left:0;}

/* ===== 悬浮工具胶囊 ===== */
.coax-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;
  display:flex;flex-direction:column;gap:10px;}
.coax-float button{width:52px;height:52px;border-radius:999px;border:none;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
  color:#fff;font-size:11px;font-weight:600;box-shadow:var(--shadow);
  background:linear-gradient(135deg,var(--accent),#6d3fd1);}
.coax-float button.coax-float-mail{background:linear-gradient(135deg,var(--accent-2),#b9802f);}
.coax-float button svg{width:20px;height:20px;}
.coax-float button:hover{filter:brightness(1.1);}

/* 名片弹层 */
.coax-card-modal{position:fixed;inset:0;background:rgba(5,8,20,.72);z-index:80;
  display:none;align-items:center;justify-content:center;padding:20px;}
.coax-card-modal.open{display:flex;}
.coax-card-modal img{width:300px;height:500px;object-fit:contain;border-radius:10px;
  box-shadow:var(--shadow);background:#fff;}
.coax-card-modal .coax-card-close{position:absolute;top:24px;right:30px;color:#fff;
  font-size:30px;cursor:pointer;background:none;border:none;}

/* ===== 页脚 ===== */
.coax-footer{background:var(--bg-2);border-top:1px solid var(--line);margin-top:40px;
  padding:34px 0 26px;color:var(--text-dim);font-size:13px;}
.coax-footer-inner{max-width:var(--maxw);margin:0 auto;padding:0 18px;
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:26px;}
.coax-footer h4{color:#fff;font-size:15px;margin:0 0 12px;}
.coax-footer a{color:var(--text-dim);display:block;margin:5px 0;}
.coax-footer a:hover{color:var(--accent-2);}
.coax-footer .coax-cols{display:contents;}
.coax-footer-bottom{max-width:var(--maxw);margin:22px auto 0;padding:16px 18px 0;
  border-top:1px solid var(--line);color:var(--text-mute);font-size:12px;}

/* ===== 404 / archive ===== */
.coax-404{padding:60px 18px;text-align:center;}
.coax-404 h1{font-size:64px;color:var(--accent);}
.coax-archive-list{columns:2;column-gap:30px;margin:10px 0;}
.coax-archive-list a{display:block;break-inside:avoid;padding:8px 0;color:var(--text-dim);
  border-bottom:1px solid var(--line-soft);}

/* ===== 响应式：≤1024 折叠 ===== */
@media (max-width:1024px){
  :root{--h2-inset:14px;}
  .coax-nav-toggle{display:block;}
  .coax-nav-menu{display:none;position:absolute;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;background:var(--bg-2);
    border-bottom:1px solid var(--line);padding:8px 12px;}
  .coax-nav-menu.is-open{display:flex;}
  .coax-nav-menu a{padding:11px 10px;}
  .coax-detail-layout .coax-layout-grid,
  .coax-list-layout .coax-layout-grid{grid-template-columns:1fr;}
  .coax-cat-side,.coax-toc-aside{position:static;max-height:none;margin-bottom:16px;}
  .coax-page-wrap{padding:24px 18px;}
  .coax-page-wrap{--h2-inset:0px;}
  .coax-hero{padding:34px 22px;}
  .coax-hero h1{font-size:30px;}
  .coax-footer-inner{grid-template-columns:1fr;}
}
@media (max-width:560px){
  .coax-archive-list{columns:1;}
  .coax-float{right:10px;}
  .coax-float button{width:46px;height:46px;}
}