/* style.css —— 液冷盲插连接器站 独立设计（深空冷调 / 电光青高亮，前缀 .bm-） */
:root{
  --bm-bg:#070e17;
  --bm-bg2:#0c1726;
  --bm-panel:#0f1d30;
  --bm-panel2:#13243b;
  --bm-line:#1d3350;
  --bm-text:#dce8f5;
  --bm-dim:#8aa6c4;
  --bm-cyan:#27e0d8;
  --bm-blue:#2f9bff;
  --bm-accent:#4af0c4;
  --bm-inset:0px;            /* 面包屑与正文 H2 左缘共用对齐基线 */
  --bm-maxw:1180px;
  --bm-radius:14px;
  --bm-font:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:
    radial-gradient(1200px 600px at 80% -10%,rgba(47,155,255,.10),transparent 60%),
    radial-gradient(900px 500px at -10% 10%,rgba(39,224,216,.08),transparent 55%),
    var(--bm-bg);
  color:var(--bm-text);font-family:var(--bm-font);line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--bm-cyan);text-decoration:none}
a:hover{color:var(--bm-accent)}
img{max-width:100%}

/* 顶栏 */
.bm-header{position:sticky;top:0;z-index:60;background:rgba(7,14,23,.82);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--bm-line)}
.bm-header-inner{max-width:var(--bm-maxw);margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:16px}
.bm-logo{font-weight:800;font-size:19px;letter-spacing:.5px;color:var(--bm-text)}
.bm-logo span{color:var(--bm-cyan)}
.bm-nav{display:flex;gap:6px;flex-wrap:wrap}
.bm-navlink{padding:8px 12px;border-radius:9px;color:var(--bm-dim);font-size:14px;
  transition:.15s}
.bm-navlink:hover{background:var(--bm-panel2);color:var(--bm-text)}
.bm-navtoggle{display:none;background:var(--bm-panel2);color:var(--bm-text);
  border:1px solid var(--bm-line);border-radius:9px;padding:8px 14px;font-size:14px;cursor:pointer}

/* 容器 / 面包屑对齐 */
.bm-wrap{max-width:var(--bm-maxw);margin:0 auto;padding:0 20px}
.bm-crumbs{font-size:13px;color:var(--bm-dim);padding:18px 0 6px;--bm-inset:0px}
.bm-crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.bm-crumbs li{display:inline-flex;align-items:center}
.bm-crumbs li:not(:last-child)::after{content:"›";margin:0 8px;color:var(--bm-line)}
.bm-crumbs a{color:var(--bm-dim)}
.bm-crumbs a:hover{color:var(--bm-cyan)}

/* 详情双栏 */
.bm-detail{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:40px;
  align-items:start;padding-bottom:60px}
.bm-article{min-width:0}
.bm-h1{font-size:30px;line-height:1.3;margin:6px 0 14px;color:#fff;
  border-left:4px solid var(--bm-cyan);padding-left:14px}

/* 摘要 / 关键词 / 时间 */
.bm-lead{background:linear-gradient(180deg,var(--bm-panel),var(--bm-bg2));
  border:1px solid var(--bm-line);border-left:3px solid var(--bm-blue);
  border-radius:12px;padding:16px 18px;color:var(--bm-text);margin:0 0 14px;font-size:15px}
.bm-kw{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 8px}
.tag-text{background:var(--bm-panel2);border:1px solid var(--bm-line);color:var(--bm-cyan);
  border-radius:999px;padding:3px 11px;font-size:12.5px}
.bm-time{font-size:12.5px;color:var(--bm-dim);margin-bottom:14px}
.bm-time time{font-style:normal}

/* 正文排版 */
.bm-article h2{font-size:22px;margin:30px 0 12px;color:#fff;
  padding-bottom:8px;border-bottom:1px solid var(--bm-line)}
.bm-article h3{font-size:18px;margin:24px 0 10px;color:var(--bm-accent)}
.bm-article p{margin:12px 0}
.bm-article ul,.bm-article ol{padding-left:22px;margin:12px 0}
.bm-article li{margin:6px 0}
.bm-article blockquote{margin:16px 0;padding:12px 16px;background:var(--bm-panel);
  border-left:4px solid var(--bm-cyan);border-radius:0 10px 10px 0;color:var(--bm-text)}
.bm-article blockquote p{margin:6px 0}
.bm-article code{background:var(--bm-panel2);padding:2px 6px;border-radius:6px;
  font-size:13px;color:var(--bm-accent)}
.bm-article hr{border:none;border-top:1px solid var(--bm-line);margin:24px 0}

/* 表格 */
.bm-article table.spec,.bm-ptable{width:100%;border-collapse:collapse;margin:16px 0;
  font-size:14px;background:var(--bm-panel);border:1px solid var(--bm-line);border-radius:10px;overflow:hidden}
.bm-article table.spec th,.bm-article table.spec td,
.bm-ptable th,.bm-ptable td{border:1px solid var(--bm-line);padding:9px 12px;text-align:left;
  vertical-align:top}
.bm-article table.spec thead th,.bm-article table.spec tr:first-child th,
.bm-ptable th{background:var(--bm-panel2);color:var(--bm-cyan);font-weight:600}
.bm-ptable th{width:34%}

/* 内链 */
.bm-ilink{color:var(--bm-cyan);border-bottom:1px dashed rgba(39,224,216,.5)}
.bm-ilink:hover{color:var(--bm-accent)}

/* 实践经验 callout */
.bm-callout{margin:18px 0;padding:14px 16px;background:rgba(74,240,196,.08);
  border:1px solid rgba(74,240,196,.35);border-radius:12px;color:var(--bm-text)}

/* FAQ 裸 details */
.bm-faq{margin:10px 0;border:1px solid var(--bm-line);border-radius:10px;
  background:var(--bm-panel);overflow:hidden}
.bm-faq summary{cursor:pointer;padding:13px 16px;font-weight:600;color:#fff;
  list-style:none;position:relative}
.bm-faq summary::-webkit-details-marker{display:none}
.bm-faq summary::before{content:"+";position:absolute;right:16px;color:var(--bm-cyan);font-weight:700}
.bm-faq[open] summary::before{content:"−"}
.bm-faq-a{padding:0 16px 14px;color:var(--bm-text)}

/* TOC sticky */
.bm-toc.toc-aside{position:sticky;top:84px;max-height:calc(100vh - 100px);overflow:auto;
  background:var(--bm-panel);border:1px solid var(--bm-line);border-radius:12px;padding:14px}
.bm-toc-title{font-size:13px;color:var(--bm-dim);margin-bottom:8px;letter-spacing:.5px}
.bm-toc-list{list-style:none;margin:0;padding:0}
.bm-toc-list li{margin:4px 0}
.bm-toc-list a{font-size:13.5px;color:var(--bm-dim)}
.bm-toc-list a:hover{color:var(--bm-cyan)}

/* 列表页 */
.bm-listlayout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:32px;
  padding-bottom:60px}
.bm-side{position:sticky;top:84px;align-self:start;
  background:var(--bm-panel);border:1px solid var(--bm-line);border-radius:12px;padding:14px}
.bm-side-title{font-size:13px;color:var(--bm-dim);margin-bottom:8px}
.category-list{list-style:none;margin:0;padding:0}
.category-list li{margin:2px 0}
.category-list a{display:block;padding:9px 12px;border-radius:9px;color:var(--bm-dim);font-size:14px}
.category-list a:hover,.category-list li.active a{background:var(--bm-panel2);color:var(--bm-cyan)}
.bm-list-ul{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.bm-listitem{border:1px solid var(--bm-line);border-radius:12px;background:var(--bm-panel);
  transition:.15s}
.bm-listitem:hover{border-color:var(--bm-cyan);transform:translateY(-2px)}
.bm-listitem a{display:block;padding:16px 18px}
.bm-li-title{display:block;font-size:17px;color:#fff;font-weight:600;margin-bottom:6px}
.bm-li-desc{display:block;font-size:13.5px;color:var(--bm-dim)}

/* 首页 */
.bm-hero{padding:56px 0 30px;text-align:center}
.bm-hero-h{font-size:38px;line-height:1.25;margin:0 0 16px;color:#fff;
  background:linear-gradient(90deg,var(--bm-cyan),var(--bm-blue));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.bm-hero-sub{font-size:16px;color:var(--bm-dim);max-width:820px;margin:0 auto 22px}
.bm-hero-cta{display:flex;gap:14px;justify-content:center}
.bm-btn{background:linear-gradient(90deg,var(--bm-cyan),var(--bm-blue));color:#04121f;
  font-weight:700;padding:12px 26px;border-radius:999px;font-size:15px}
.bm-btn-ghost{background:transparent;border:1px solid var(--bm-line);color:var(--bm-text)}
.bm-sec{margin:34px 0}
.bm-sec-h{font-size:22px;color:#fff;margin:0 0 16px;border-left:4px solid var(--bm-cyan);padding-left:12px}
.bm-chips{display:flex;flex-wrap:wrap;gap:10px}
.bm-chip{background:var(--bm-panel);border:1px solid var(--bm-line);color:var(--bm-cyan);
  border-radius:999px;padding:7px 15px;font-size:13.5px}
.bm-hgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.bm-hcard{display:flex;flex-direction:column;gap:6px;background:var(--bm-panel);
  border:1px solid var(--bm-line);border-radius:14px;padding:18px;transition:.15s}
.bm-hcard:hover{border-color:var(--bm-cyan);transform:translateY(-3px)}
.bm-hcard-cat{font-size:12px;color:var(--bm-accent)}
.bm-hcard-t{font-size:17px;font-weight:600;color:#fff}
.bm-hcard-d{font-size:13px;color:var(--bm-dim)}

/* 归档 */
.bm-arch{list-style:none;margin:10px 0;padding:0;display:grid;gap:8px}
.bm-arch li{padding:10px 14px;background:var(--bm-panel);border:1px solid var(--bm-line);border-radius:10px}
.bm-arch a{color:var(--bm-text)}

/* 页脚 */
.bm-footer{border-top:1px solid var(--bm-line);background:var(--bm-bg2);margin-top:40px}
.bm-footer-inner{max-width:var(--bm-maxw);margin:0 auto;padding:28px 20px;
  display:flex;flex-direction:column;gap:12px}
.bm-footer-nav{display:flex;flex-wrap:wrap;gap:14px}
.bm-footer-nav a{color:var(--bm-dim);font-size:13.5px}
.bm-footer-note{font-size:12.5px;color:var(--bm-dim);margin:0}
.bm-footer-copy{font-size:12.5px;color:var(--bm-dim);margin:0}

/* 悬浮胶囊 */
.bm-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;gap:10px}
.bm-capsule button,.bm-cap-ico{width:46px;height:46px;border-radius:999px;border:none;
  cursor:pointer;display:flex;align-items:center;justify-content:center;font-weight:700;color:#04121f;
  background:linear-gradient(135deg,var(--bm-cyan),var(--bm-blue));box-shadow:0 6px 18px rgba(39,224,216,.35)}
.bm-cap-ico{font-size:0}
.bm-cap-ico::after{content:"";width:16px;height:16px;border:2px solid #04121f;border-radius:50%;
  border-top-color:transparent;transform:rotate(45deg)}
.bm-cap-tx{display:none}
.bm-cap-tx.bm-shown{display:inline-block;background:linear-gradient(135deg,var(--bm-cyan),var(--bm-blue));
  color:#04121f;font-weight:700;font-size:12px;padding:7px 11px;border-radius:999px;cursor:pointer;
  box-shadow:0 6px 18px rgba(39,224,216,.35);text-align:center}

/* 弹窗 */
.bm-modal{position:fixed;inset:0;z-index:90;display:none}
.bm-modal.open{display:block}
.bm-modal-mask{position:absolute;inset:0;background:rgba(0,0,0,.6)}
.bm-modal-box{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--bm-panel);border:1px solid var(--bm-line);border-radius:14px;padding:18px;
  width:320px;text-align:center}
.bm-modal-close{position:absolute;right:10px;top:6px;background:none;border:none;color:var(--bm-dim);
  font-size:24px;cursor:pointer}
.bm-modal-tip{font-size:13px;color:var(--bm-dim);margin:0 0 12px}
.bm-modal-img{width:300px;height:500px;object-fit:contain;border-radius:8px;background:#fff}

/* 移动端 */
@media (max-width:900px){
  .bm-detail{grid-template-columns:1fr;gap:0}
  .bm-toc.toc-aside{display:none}
  .bm-listlayout{grid-template-columns:1fr}
  .bm-side{position:static}
  .bm-hgrid{grid-template-columns:1fr}
  .bm-nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    background:var(--bm-bg2);border-bottom:1px solid var(--bm-line);padding:10px}
  .bm-nav.open{display:flex}
  .bm-navtoggle{display:inline-block}
  .bm-hero-h{font-size:28px}
}