/* ============================================================
   天线.公司 · 无线波束主题 (Wireless Beam) — atn- 前缀独立骨架
   深空底 #0A0E1A + 波束紫 #6D5BFF + 信号青 #21D4FD + 高频金 #F4C145
   ============================================================ */
:root{
  --bg:#0A0E1A;
  --bg-soft:#0F1525;
  --bg-card:#121A2E;
  --bg-card-2:#16203a;
  --line:#26314d;
  --line-soft:#1c2840;
  --txt:#E6ECF7;
  --txt-soft:#A8B4CC;
  --txt-dim:#74809A;
  --violet:#6D5BFF;
  --violet-2:#8A7BFF;
  --cyan:#21D4FD;
  --gold:#F4C145;
  --radius:14px;
  --h2-inset:16px;            /* 面包屑与正文 H2 左缘对齐基准 */
  --nav-h:64px;
  --maxw:1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
a{color:var(--cyan);text-decoration:none;}
a:hover{color:var(--violet-2);}
img{max-width:100%;}
h1,h2,h3,h4{line-height:1.35;font-weight:700;}
h1{font-size:30px;margin:.2em 0 .6em;}
h2{font-size:23px;margin:1.8em 0 .8em;color:#fff;
   border-left:4px solid var(--violet);padding-left:12px;}
h3{font-size:19px;margin:1.4em 0 .6em;color:var(--cyan);}
p{margin:.7em 0;color:var(--txt);}
ul,ol{margin:.6em 0;padding-left:1.4em;}
li{margin:.35em 0;}

/* ---------- 布局容器 ---------- */
.atn-container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.atn-article-layout,.atn-list-layout,.atn-page-wrap{
  max-width:var(--maxw);margin:0 auto;padding:0 20px;
}
.atn-layout-grid{
  display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;
  align-items:start;margin-top:18px;
}
.atn-list-layout .atn-layout-grid{
  grid-template-columns:240px minmax(0,1fr);   /* [M27] 侧栏在前：240 居左、内容 1fr */
}
.atn-content-main{
  padding:0 24px 0 var(--h2-inset);
  min-width:0;
}
.atn-cat-content{padding:0 24px 0 var(--h2-inset);min-width:0;}

/* ---------- 顶部导航 ---------- */
.atn-header{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:90;
  background:rgba(10,14,26,.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.atn-header .atn-container{display:flex;align-items:center;height:100%;justify-content:space-between;}
.atn-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:#fff;}
.atn-brand .atn-logo-dot{width:14px;height:14px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,var(--cyan),var(--violet));
  box-shadow:0 0 14px var(--violet);}
.atn-nav{display:flex;align-items:center;gap:4px;}
.atn-nav>a{
  color:var(--txt-soft);padding:8px 13px;border-radius:9px;font-size:14.5px;
  position:relative;transition:.2s;
}
.atn-nav>a:hover,.atn-nav>a.atn-nav-active{color:#fff;background:var(--bg-card);}
.atn-nav-item{position:relative;}
.atn-nav-item>.atn-nav-sub{
  position:absolute;top:100%;left:0;min-width:170px;
  background:var(--bg-card);border:1px solid var(--line);border-radius:12px;
  padding:8px;display:none;flex-direction:column;gap:2px;box-shadow:0 18px 40px rgba(0,0,0,.5);
}
.atn-nav-item:hover>.atn-nav-sub,.atn-nav-item:focus-within>.atn-nav-sub{display:flex;}
.atn-nav-sub a{padding:8px 12px;border-radius:8px;color:var(--txt-soft);font-size:14px;}
.atn-nav-sub a:hover{background:var(--bg-card-2);color:#fff;}
.atn-nav-toggle{display:none;background:none;border:1px solid var(--line);color:#fff;
  border-radius:9px;padding:7px 11px;cursor:pointer;font-size:18px;}

/* ---------- 面包屑（[M18c++] 对齐 H2 左缘） ---------- */
.atn-crumb{
  max-width:var(--maxw);
  margin:calc(var(--nav-h) + 14px) auto 0;
  padding:0 20px 0 calc(20px + var(--h2-inset));
  font-size:13.5px;color:var(--txt-dim);
}
.atn-crumb a{color:var(--txt-soft);}
.atn-crumb .sep{margin:0 8px;color:var(--line);}
.atn-crumb .cur{color:var(--txt);}

/* ---------- 详情页目录 TOC ---------- */
.atn-toc-aside{position:sticky;top:calc(var(--nav-h) + 18px);
  max-height:calc(100vh - var(--nav-h) - 36px);overflow:auto;}
.atn-toc-panel,.atn-cat-panel{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);
  padding:6px 0;
}
.atn-toc-panel>summary,.atn-cat-panel>summary{
  cursor:pointer;list-style:none;padding:12px 16px;font-weight:700;color:#fff;
  display:flex;align-items:center;justify-content:space-between;
}
.atn-toc-panel>summary::-webkit-details-marker{display:none;}
.atn-toc-panel>summary::after,.atn-cat-panel>summary::after{
  content:"";width:8px;height:8px;border-right:2px solid var(--cyan);
  border-bottom:2px solid var(--cyan);transform:rotate(45deg);transition:.25s;
}
.atn-toc-panel[open]>summary::after,.atn-cat-panel[open]>summary::after{transform:rotate(-135deg);}
.atn-toc-panel ol{margin:0;padding:6px 16px 12px 30px;counter-reset:toc;}
.atn-toc-panel ol li{margin:7px 0;font-size:14px;color:var(--txt-soft);}
.atn-toc-panel ol li a{color:var(--txt-soft);}
.atn-toc-panel ol li a:hover{color:var(--cyan);}

/* ---------- 分类侧栏 ---------- */
.atn-cat-side{padding-top:6px;}
.atn-cat-panel ul.atn-category-list{list-style:none;margin:0;padding:6px 8px 12px;}
.atn-cat-panel ul.atn-category-list li{margin:2px 0;}
.atn-cat-panel ul.atn-category-list a{
  display:block;padding:9px 12px;border-radius:9px;color:var(--txt-soft);font-size:14.5px;
  border-left:3px solid transparent;
}
.atn-cat-panel ul.atn-category-list a:hover,.atn-cat-panel ul.atn-category-list a.active{
  background:var(--bg-card-2);color:#fff;border-left-color:var(--violet);
}

/* ---------- 卡片 / 列表条目 ---------- */
.atn-card{
  background:linear-gradient(150deg,var(--bg-card),var(--bg-card-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 20px 18px;position:relative;overflow:hidden;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);
  transition:.25s;
}
.atn-card:hover{border-color:var(--violet);transform:translateY(-3px);
  box-shadow:0 16px 40px rgba(109,91,255,.22);}
.atn-card h3{margin:.1em 0 .4em;font-size:18px;}
.atn-card h3 a{color:#fff;}
.atn-card .atn-meta{font-size:12.5px;color:var(--txt-dim);margin-bottom:8px;}
.atn-card p{font-size:14.5px;color:var(--txt-soft);margin:.4em 0;}
.atn-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin-top:8px;}
.atn-tag-text{display:inline-block;background:rgba(33,212,253,.12);color:var(--cyan);
  border:1px solid rgba(33,212,253,.3);border-radius:999px;font-size:12px;
  padding:2px 10px;margin:3px 4px 3px 0;}

/* ---------- 表格（[M26] 覆盖全部正文 <table>） ---------- */
.atn-content-main table,.atn-cat-content table,.atn-page-main table,table.atn-spec{
  width:100%;border-collapse:collapse;margin:1em 0;font-size:14.5px;
  border:1px solid #cbd5e1;background:var(--bg-card);
}
.atn-content-main table th,.atn-cat-content table th,.atn-page-main table th,table.atn-spec th{
  background:var(--violet);color:#fff;text-align:left;padding:10px 12px;border:1px solid #cbd5e1;
}
.atn-content-main table td,.atn-cat-content table td,.atn-page-main table td,table.atn-spec td{
  padding:9px 12px;border:1px solid #41506f;color:var(--txt-soft);
}
.atn-content-main table tr:nth-child(even) td,.atn-cat-content table tr:nth-child(even) td,
.atn-page-main table tr:nth-child(even) td,table.atn-spec tr:nth-child(even) td{
  background:rgba(255,255,255,.03);
}

/* ---------- 摘要块 / 结论块 / 实践经验 ---------- */
.atn-summary-box{
  background:linear-gradient(135deg,rgba(109,91,255,.12),rgba(33,212,253,.08));
  border:1px solid var(--line);border-left:4px solid var(--cyan);
  border-radius:12px;padding:16px 18px;margin:1em 0;color:var(--txt);
}
.atn-conclusion{
  background:var(--bg-card);border:1px solid var(--line);border-radius:12px;
  padding:14px 18px;margin:1.2em 0;
}
.atn-conclusion strong{color:var(--gold);}
.atn-case{
  background:rgba(244,193,69,.08);border:1px dashed rgba(244,193,69,.5);
  border-radius:12px;padding:14px 18px;margin:1.2em 0;color:var(--txt-soft);
}
.atn-case b{color:var(--gold);}

/* ---------- FAQ 裸 details（包在 atn-faq-wrap 内，bare_details） ---------- */
.atn-faq-wrap{margin-top:1.4em;}
.atn-faq-wrap details{background:var(--bg-card);border:1px solid var(--line);
  border-radius:12px;margin:.6em 0;padding:0 16px;}
.atn-faq-wrap details>summary{cursor:pointer;padding:14px 0;font-weight:600;color:#fff;list-style:none;
  display:flex;justify-content:space-between;align-items:center;}
.atn-faq-wrap details>summary::-webkit-details-marker{display:none;}
.atn-faq-wrap details>summary::after{content:"+";color:var(--cyan);font-size:20px;}
.atn-faq-wrap details[open]>summary::after{content:"−";}
.atn-faq-wrap details .atn-faq-a{padding:0 0 14px;color:var(--txt-soft);font-size:15px;}

/* ---------- 相关阅读 / 相关产品 ---------- */
.atn-rel{border-top:1px solid var(--line);margin-top:1.6em;padding-top:1em;}
.atn-rel h2{border-left-color:var(--cyan);}
.atn-rel ul{list-style:none;padding-left:0;}
.atn-rel li{margin:.5em 0;padding-left:18px;position:relative;color:var(--txt-soft);}
.atn-rel li::before{content:"▸";position:absolute;left:0;color:var(--violet);}

/* ---------- 页面主卡片（关于/联系等） ---------- */
.atn-page-main{max-width:860px;margin:10px auto 0;padding:0 20px 40px;}
.atn-page-main .atn-content-card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 30px;clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.atn-page-wrap{--h2-inset:16px;}

/* ---------- 悬浮胶囊（右侧居中） ---------- */
.atn-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:120;
  display:flex;flex-direction:column;gap:12px;}
.atn-capsule{
  display:flex;align-items:center;gap:8px;justify-content:center;
  width:52px;height:52px;border-radius:30px;cursor:pointer;border:none;
  background:linear-gradient(135deg,var(--violet),var(--cyan));color:#fff;
  font-size:20px;box-shadow:0 8px 24px rgba(109,91,255,.45);transition:.2s;position:relative;
}
.atn-capsule:hover{width:auto;padding:0 16px;border-radius:30px;}
.atn-capsule:hover .atn-cap-label{display:inline;white-space:nowrap;}
.atn-cap-label{display:none;font-size:13px;font-weight:600;}
.atn-card-pop{
  position:fixed;right:80px;top:50%;transform:translateY(-50%);z-index:130;
  background:var(--bg-card);border:1px solid var(--line);border-radius:14px;
  padding:12px;box-shadow:0 20px 50px rgba(0,0,0,.6);
}
.atn-card-pop[hidden]{display:none;}
.atn-card-pop img{max-width:300px;display:block;border-radius:8px;}
.atn-card-pop .atn-card-close{position:absolute;top:6px;right:10px;color:var(--txt-soft);
  cursor:pointer;font-size:18px;}
.atn-card-pop .atn-card-cap{font-size:12.5px;color:var(--txt-dim);text-align:center;margin-top:6px;}

/* ---------- 页脚 ---------- */
.atn-footer{margin-top:60px;border-top:1px solid var(--line);
  background:linear-gradient(180deg,transparent,rgba(109,91,255,.05));}
.atn-footer .atn-container{padding-top:34px;padding-bottom:26px;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px;}
.atn-foot-title{font-size:14px;font-weight:700;color:#fff;margin-bottom:12px;}
.atn-footer a{display:block;color:var(--txt-soft);font-size:13.5px;margin:6px 0;}
.atn-footer a:hover{color:var(--cyan);}
.atn-foot-bottom{border-top:1px solid var(--line-soft);text-align:center;
  padding:16px;font-size:13px;color:var(--txt-dim);}

/* ---------- 首页 hero ---------- */
.atn-hero{position:relative;overflow:hidden;padding:calc(var(--nav-h) + 60px) 0 60px;}
.atn-hero::before{content:"";position:absolute;inset:-20% -10% auto -10%;height:520px;z-index:0;
  background:radial-gradient(60% 60% at 70% 10%,rgba(109,91,255,.35),transparent 60%),
             radial-gradient(50% 50% at 20% 30%,rgba(33,212,253,.22),transparent 60%);
  filter:blur(8px);}
.atn-hero .atn-container{position:relative;z-index:1;}
.atn-hero h1{font-size:42px;background:linear-gradient(120deg,#fff,var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;max-width:760px;}
.atn-hero p{font-size:18px;color:var(--txt-soft);max-width:680px;}
.atn-hero .atn-hero-cta{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap;}
.atn-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:30px;
  font-weight:700;font-size:15px;cursor:pointer;border:none;}
.atn-btn-primary{background:linear-gradient(135deg,var(--violet),var(--cyan));color:#fff;}
.atn-btn-ghost{border:1px solid var(--line);color:#fff;background:rgba(255,255,255,.04);}
.atn-stats{display:flex;gap:30px;margin-top:34px;flex-wrap:wrap;}
.atn-stats .atn-stat b{display:block;font-size:28px;color:var(--gold);}
.atn-stats .atn-stat span{font-size:13px;color:var(--txt-dim);}
.atn-section{padding:46px 0;}
.atn-section h2.atn-sec-title{font-size:26px;color:#fff;border:none;padding:0;margin:0 0 6px;}
.atn-section .atn-sec-sub{color:var(--txt-dim);margin-bottom:22px;}
.atn-chips{display:flex;flex-wrap:wrap;gap:10px;}
.atn-chip{background:var(--bg-card);border:1px solid var(--line);border-radius:999px;
  padding:8px 16px;font-size:14px;color:var(--txt-soft);}

/* ---------- 归档页 ---------- */
.atn-archive-group{margin-bottom:30px;}
.atn-archive-group h3{color:var(--cyan);}
.atn-archive-list{columns:2;column-gap:30px;}
.atn-archive-list a{display:block;color:var(--txt-soft);padding:5px 0;break-inside:avoid;}
.atn-archive-list a:hover{color:var(--cyan);}

/* ---------- 404 ---------- */
.atn-404{text-align:center;padding:120px 20px;}
.atn-404 h1{font-size:90px;background:linear-gradient(120deg,var(--violet),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;}

/* ---------- 响应式（[M25] 折叠 + 单栏） ---------- */
@media (max-width:1024px){
  .atn-layout-grid,.atn-list-layout .atn-layout-grid{
    grid-template-columns:1fr;gap:18px;
  }
  .atn-toc-aside,.atn-cat-side{position:static;max-height:none;}
  .atn-nav{position:absolute;top:var(--nav-h);left:0;right:0;flex-direction:column;
    background:var(--bg-soft);border-bottom:1px solid var(--line);padding:10px;display:none;}
  .atn-nav.atn-nav-open{display:flex;}
  .atn-nav-item>.atn-nav-sub{position:static;display:flex;box-shadow:none;border:none;
    background:transparent;padding-left:10px;}
  .atn-nav-toggle{display:block;}
  .atn-content-main,.atn-cat-content{padding:0;}
  .atn-crumb{padding:0 20px;}
  .atn-hero h1{font-size:32px;}
  .atn-footer .atn-container{grid-template-columns:1fr 1fr;}
}
@media (max-width:600px){
  .atn-footer .atn-container{grid-template-columns:1fr;}
  .atn-archive-list{columns:1;}
  .atn-hero h1{font-size:27px;}
  .atn-float{right:10px;}
}