/* =====================================================================
   nickel｜镍底层与扩散阻挡 —— 独立视觉体系（ni- 前缀，与集群其他站无复用）
   主题：镍银灰 + 金铜色，深炭字色；明亮科技风、工程感
   ===================================================================== */
:root{
  --ni-bg:#eef1f5;
  --ni-surface:#ffffff;
  --ni-surface-2:#f6f8fb;
  --ni-ink:#1d2630;
  --ni-muted:#5b6776;
  --ni-soft:#8a96a5;
  --ni-line:#cdd6e0;
  --ni-line-strong:#b7c2cf;
  --ni-primary:#8c9ba8;        /* 镍银灰 */
  --ni-primary-dark:#46535f;
  --ni-navy:#16263d;           /* 深底 */
  --ni-accent:#c9a227;         /* 金铜色 */
  --ni-accent-dark:#a37e10;
  --ni-accent-soft:#f3ead0;
  --ni-radius:14px;
  --ni-radius-sm:9px;
  --ni-shadow:0 10px 30px rgba(22,38,61,.10);
  --ni-shadow-sm:0 4px 14px rgba(22,38,61,.08);
  --ni-maxw:1200px;
  --h2-inset:16px;             /* 面包屑与 H2 左缘对齐基准 */
  --nav-h:64px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ni-ink);
  background:var(--ni-bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--ni-primary-dark);text-decoration:none;}
a:hover{color:var(--ni-accent-dark);}
img{max-width:100%;display:block;}
h1,h2,h3,h4{line-height:1.35;color:var(--ni-navy);font-weight:700;}
.container{max-width:var(--ni-maxw);margin:0 auto;padding:0 24px;}

/* ---------- 顶部固定导航 ---------- */
.ni-nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:80;
  background:rgba(22,38,61,.92);backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid rgba(201,162,39,.35);
}
.ni-nav-inner{max-width:var(--ni-maxw);margin:0 auto;height:100%;display:flex;align-items:center;gap:18px;padding:0 24px;}
.ni-logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:18px;letter-spacing:.5px;}
.ni-logo .ni-mark{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,var(--ni-primary),var(--ni-accent));display:inline-block;}
.ni-logo b{color:var(--ni-accent);}
.ni-nav-links{display:flex;align-items:center;gap:6px;margin:0;padding:0;list-style:none;margin-left:auto;}
.ni-nav-links>li{position:relative;}
.ni-nav-links a,.ni-menu-btn{display:block;padding:9px 14px;color:#dfe6ee;font-size:15px;border-radius:8px;background:none;border:none;cursor:pointer;font-family:inherit;}
.ni-nav-links a:hover,.ni-menu-btn:hover{background:rgba(255,255,255,.10);color:#fff;}
.ni-menu-panel{
  position:absolute;top:100%;left:0;min-width:230px;background:var(--ni-surface);
  border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);box-shadow:var(--ni-shadow);
  padding:8px;display:none;z-index:90;
}
.ni-menu:hover .ni-menu-panel{display:block;}
.ni-menu-panel a{color:var(--ni-ink);padding:8px 12px;border-radius:7px;display:flex;flex-direction:column;}
.ni-menu-panel a small{color:var(--ni-soft);font-size:12px;font-weight:400;}
.ni-menu-panel a:hover{background:var(--ni-surface-2);color:var(--ni-accent-dark);}
.ni-nav-toggle{display:none;background:none;border:none;color:#fff;font-size:26px;cursor:pointer;margin-left:auto;}

/* ---------- 通用区块 ---------- */
.ni-section{padding:54px 0;}
.ni-section-head{text-align:center;margin-bottom:34px;}
.ni-section-head h2{font-size:30px;margin:0 0 8px;}
.ni-section-head p{color:var(--ni-muted);margin:0;max-width:720px;margin-inline:auto;}
.ni-btn{display:inline-block;padding:11px 22px;border-radius:999px;font-weight:600;background:var(--ni-accent);color:#1d2630;border:0;cursor:pointer;box-shadow:var(--ni-shadow-sm);}
.ni-btn:hover{background:var(--ni-accent-dark);color:#fff;}
.ni-btn.ghost{background:none;border:1px solid var(--ni-line-strong);color:var(--ni-ink);}

/* ---------- 首页 Hero ---------- */
.ni-hero{position:relative;padding:120px 0 70px;background:
   radial-gradient(1200px 480px at 80% -10%,rgba(201,162,39,.18),transparent 60%),
   linear-gradient(160deg,#16263d 0%,#243a57 55%,#2c4a6b 100%);color:#fff;overflow:hidden;}
.ni-hero .container{position:relative;z-index:2;}
.ni-hero h1{color:#fff;font-size:46px;margin:0 0 16px;line-height:1.2;}
.ni-hero p{color:#cdd9e6;font-size:18px;max-width:720px;}
.ni-hero .ni-baseline{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;}
.ni-baseline .ni-chip{background:rgba(255,255,255,.08);border:1px solid rgba(201,162,39,.4);padding:10px 16px;border-radius:12px;}
.ni-baseline .ni-chip b{color:var(--ni-accent);font-size:22px;display:block;}
.ni-hero-cta{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap;}

/* 基线数字带 */
.ni-statband{background:var(--ni-navy);color:#fff;padding:26px 0;}
.ni-statband .container{display:flex;flex-wrap:wrap;gap:30px;justify-content:space-between;}
.ni-statband .ni-stat{flex:1;min-width:160px;text-align:center;}
.ni-statband .ni-stat b{display:block;font-size:30px;color:var(--ni-accent);}
.ni-statband .ni-stat span{color:#b9c6d6;font-size:14px;}

/* 卡片网格 */
.ni-grid{display:grid;gap:22px;}
.ni-grid.cols-3{grid-template-columns:repeat(3,1fr);}
.ni-grid.cols-2{grid-template-columns:repeat(2,1fr);}
.ni-card{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:var(--ni-radius);padding:24px;box-shadow:var(--ni-shadow-sm);transition:.18s;}
.ni-card:hover{transform:translateY(-4px);box-shadow:var(--ni-shadow);border-color:var(--ni-accent);}
.ni-card h3{margin:0 0 8px;font-size:19px;}
.ni-card .ni-card-tag{display:inline-block;font-size:12px;color:var(--ni-accent-dark);background:var(--ni-accent-soft);padding:3px 10px;border-radius:999px;margin-bottom:10px;}
.ni-card p{color:var(--ni-muted);margin:0 0 12px;font-size:14.5px;}
.ni-card a.ni-more{font-weight:600;color:var(--ni-accent-dark);}

/* 关键词矩阵 */
.ni-kw-matrix{display:flex;flex-wrap:wrap;gap:10px;}
.ni-kw-matrix .ni-kw{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:999px;padding:8px 16px;font-size:14px;color:var(--ni-ink);}

/* 场景条 */
.ni-scenarios{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
.ni-scenarios .ni-scn{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);padding:18px;position:relative;overflow:hidden;}
.ni-scenarios .ni-scn::before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:var(--ni-accent);}
.ni-scenarios .ni-scn h4{margin:0 0 6px;font-size:15px;}
.ni-scenarios .ni-scn small{color:var(--ni-soft);}

/* ---------- 面包屑（与 H2 左缘对齐） ---------- */
.ni-breadcrumb{font-size:13.5px;color:var(--ni-soft);padding:calc(var(--nav-h) + 18px) 0 0;margin:0;}
.ni-breadcrumb nav{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.ni-breadcrumb a{color:var(--ni-muted);}
.ni-breadcrumb a:hover{color:var(--ni-accent-dark);}
.ni-breadcrumb .sep{color:var(--ni-line-strong);}
.ni-breadcrumb .cur{color:var(--ni-ink);font-weight:600;}

/* ---------- 列表页布局（侧栏在前，240px + 1fr） ---------- */
.ni-list-layout{padding-bottom:60px;}
.ni-list-layout .ni-layout-grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start;}
.ni-cat-side{position:sticky;top:calc(var(--nav-h) + 16px);}
.ni-cat-panel{border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);background:var(--ni-surface);overflow:hidden;}
.ni-cat-panel>summary{list-style:none;cursor:pointer;padding:12px 16px;font-weight:700;color:var(--ni-navy);display:flex;justify-content:space-between;align-items:center;background:var(--ni-surface-2);}
.ni-cat-panel>summary::-webkit-details-marker{display:none;}
.ni-cat-panel>summary::after{content:"▾";transition:.2s;color:var(--ni-accent);}
.ni-cat-panel[open]>summary::after{transform:rotate(180deg);}
.ni-cat-list{list-style:none;margin:0;padding:8px;}
.ni-cat-list li a{display:block;padding:9px 12px;border-radius:7px;color:var(--ni-ink);font-size:14.5px;}
.ni-cat-list li a:hover,.ni-cat-list li a.active{background:var(--ni-accent-soft);color:var(--ni-accent-dark);font-weight:600;}
.ni-cat-list li small{display:block;color:var(--ni-soft);font-size:12px;}
.ni-cat-content h1{margin:0 0 6px;font-size:30px;}
.ni-cat-content .ni-cat-desc{color:var(--ni-muted);margin:0 0 22px;}
.ni-list-items{display:grid;gap:16px;}
.ni-list-row{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);padding:18px 20px;transition:.18s;}
.ni-list-row:hover{border-color:var(--ni-accent);box-shadow:var(--ni-shadow-sm);}
.ni-list-row h3{margin:0 0 6px;font-size:18px;}
.ni-list-row p{margin:0;color:var(--ni-muted);font-size:14px;}
.ni-list-row .ni-meta{margin-top:8px;color:var(--ni-soft);font-size:12.5px;}
.ni-pagination{display:flex;gap:8px;margin-top:26px;flex-wrap:wrap;}
.ni-pagination a,.ni-pagination span{padding:8px 13px;border-radius:8px;border:1px solid var(--ni-line);background:var(--ni-surface);font-size:14px;color:var(--ni-ink);}
.ni-pagination .cur{background:var(--ni-accent);color:#1d2630;border-color:var(--ni-accent);font-weight:700;}

/* ---------- 详情页布局（内容在前，1fr + 240px） ---------- */
.ni-article-layout,.ni-page-layout{padding-bottom:60px;}
.ni-layout-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:32px;align-items:start;}
.ni-content-main,.ni-page-main{max-width:760px;margin:0 auto;width:100%;}
.ni-content-main h1,.ni-page-main h1{font-size:32px;margin:6px 0 14px;}
.ni-summary-block{background:var(--ni-accent-soft);border-left:4px solid var(--ni-accent);padding:16px 18px;border-radius:0 var(--ni-radius-sm) var(--ni-radius-sm) 0;color:var(--ni-ink);margin-bottom:18px;}
.ni-keywords{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px;}
.ni-keywords .ni-kw{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:999px;padding:4px 12px;font-size:13px;}
.ni-update-time{color:var(--ni-soft);font-size:13px;margin-bottom:18px;}
.ni-content-main h2,.ni-page-main h2{font-size:23px;margin:34px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--ni-line);}
.ni-content-main h3,.ni-page-main h3{font-size:18px;margin:24px 0 10px;color:var(--ni-primary-dark);}
.ni-content-main p,.ni-page-main p{margin:0 0 14px;color:#2a3440;}
.ni-content-main ul,.ni-page-main ul,.ni-content-main ol,.ni-page-main ol{padding-left:22px;margin:0 0 14px;color:#2a3440;}
.ni-content-main li,.ni-page-main li{margin:6px 0;}
.ni-content-main strong,.ni-page-main strong{color:var(--ni-navy);}
.ni-content-main blockquote,.ni-page-main blockquote{margin:16px 0;padding:14px 18px;background:var(--ni-surface-2);border-left:4px solid var(--ni-primary);border-radius:0 10px 10px 0;color:var(--ni-muted);}

/* 表格：同时覆盖带 class 与 Markdown 裸 table */
table.ni-spec,.ni-content-main table,.ni-page-main table{
  border-collapse:collapse;width:100%;margin:16px 0 22px;font-size:14.5px;
  border:2px solid var(--ni-line-strong);
}
table.ni-spec th,.ni-content-main table th,.ni-page-main table th{
  background:var(--ni-navy);color:#fff;text-align:left;padding:10px 12px;font-weight:600;
}
table.ni-spec td,.ni-content-main table td,.ni-page-main table td{
  border:1px solid var(--ni-line);padding:9px 12px;color:#2a3440;
}
table.ni-spec tr:nth-child(even) td,.ni-content-main table tr:nth-child(even) td,.ni-page-main table tr:nth-child(even) td{
  background:var(--ni-surface-2);
}

/* FAQ（裸 details） */
.ni-faq-block{margin:26px 0;}
.ni-faq-block h2{font-size:23px;margin:0 0 12px;}
.ni-faq-block details{border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);margin-bottom:10px;background:var(--ni-surface);overflow:hidden;}
.ni-faq-block details summary{cursor:pointer;padding:13px 16px;font-weight:600;color:var(--ni-navy);list-style:none;display:flex;justify-content:space-between;align-items:center;}
.ni-faq-block details summary::-webkit-details-marker{display:none;}
.ni-faq-block details summary::after{content:"+";color:var(--ni-accent);font-size:20px;}
.ni-faq-block details[open] summary::after{content:"−";}
.ni-faq-block details p{padding:0 16px 14px;margin:0;color:#2a3440;}

/* 相关阅读 / 相关产品 */
.ni-related{margin:30px 0;}
.ni-related h2{font-size:20px;margin:0 0 14px;}
.ni-related ul{list-style:none;padding:0;display:grid;gap:10px;}
.ni-related li{background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);padding:14px 16px;}
.ni-related li a{font-weight:600;}
.ni-related li p{margin:4px 0 0;color:var(--ni-muted);font-size:13.5px;}

/* 目录侧栏（sticky，非 fixed） */
.ni-toc-aside{position:sticky;top:calc(var(--nav-h) + 16px);max-height:calc(100vh - 100px);overflow-y:auto;font-size:13.5px;}
.ni-toc-panel{border:1px solid var(--ni-line);border-radius:var(--ni-radius-sm);background:var(--ni-surface);overflow:hidden;}
.ni-toc-panel>summary{list-style:none;cursor:pointer;padding:11px 15px;font-weight:700;color:var(--ni-navy);display:flex;justify-content:space-between;align-items:center;background:var(--ni-surface-2);}
.ni-toc-panel>summary::-webkit-details-marker{display:none;}
.ni-toc-panel>summary::after{content:"▾";color:var(--ni-accent);transition:.2s;}
.ni-toc-panel[open]>summary::after{transform:rotate(180deg);}
.ni-toc-panel ol{list-style:none;margin:0;padding:8px 12px;}
.ni-toc-panel li{margin:2px 0;}
.ni-toc-panel a{color:var(--ni-muted);display:block;padding:5px 8px;border-radius:6px;border-left:2px solid transparent;}
.ni-toc-panel a:hover,.ni-toc-panel a.active{color:var(--ni-accent-dark);border-left-color:var(--ni-accent);background:var(--ni-accent-soft);}
.ni-toc-panel li.h3 a{padding-left:22px;font-size:12.5px;}

/* 标签 */
.ni-tag-row{margin:18px 0;display:flex;flex-wrap:wrap;gap:8px;}
.tag-text{background:var(--ni-surface-2);border:1px solid var(--ni-line);border-radius:999px;padding:4px 12px;font-size:12.5px;color:var(--ni-muted);}

/* ---------- 悬浮工具胶囊 ---------- */
.ni-capsule{position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:100;display:flex;flex-direction:column;gap:8px;
  background:linear-gradient(160deg,var(--ni-accent),var(--ni-primary));padding:10px;border-radius:999px;box-shadow:var(--ni-shadow);}
.ni-cap-btn{border:none;background:rgba(255,255,255,.16);color:#fff;font-size:13px;font-weight:600;padding:12px 14px;border-radius:999px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:3px;width:62px;font-family:inherit;transition:.15s;}
.ni-cap-btn:hover{background:rgba(22,38,61,.85);transform:scale(1.04);}
.ni-cap-btn .ni-ic{font-size:18px;line-height:1;}

/* 名片弹层 */
.ni-card-pop{position:fixed;right:96px;top:50%;transform:translateY(-50%);z-index:120;display:none;background:var(--ni-surface);border-radius:14px;box-shadow:var(--ni-shadow);padding:10px;}
.ni-card-pop.open{display:block;}
.ni-card-pop img{width:300px;height:500px;object-fit:contain;border-radius:8px;}
.ni-card-close{position:absolute;top:-12px;right:-12px;width:30px;height:30px;border-radius:50%;border:none;background:var(--ni-navy);color:#fff;font-size:18px;cursor:pointer;box-shadow:var(--ni-shadow-sm);}

/* ---------- 页脚 ---------- */
.ni-footer{background:var(--ni-navy);color:#aebccd;padding:46px 0 26px;margin-top:30px;}
.ni-footer .container{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;}
.ni-footer h4{color:#fff;font-size:15px;margin:0 0 12px;}
.ni-footer a{color:#aebccd;font-size:14px;display:block;padding:4px 0;}
.ni-footer a:hover{color:var(--ni-accent);}
.ni-footer .ni-foot-about{font-size:13.5px;line-height:1.7;}
.ni-footer-bottom{border-top:1px solid rgba(255,255,255,.10);margin-top:26px;padding-top:16px;font-size:13px;color:#7e8ea0;text-align:center;}

/* ---------- 归档页 ---------- */
.ni-archive-group{margin-bottom:30px;}
.ni-archive-group h3{border-left:4px solid var(--ni-accent);padding-left:12px;margin:0 0 12px;}
.ni-archive-group ul{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:8px;}
.ni-archive-group li a{padding:8px 12px;background:var(--ni-surface);border:1px solid var(--ni-line);border-radius:8px;display:block;font-size:14px;color:var(--ni-ink);}
.ni-archive-group li a:hover{border-color:var(--ni-accent);color:var(--ni-accent-dark);}

/* ---------- 404 ---------- */
.ni-404{padding:140px 0;text-align:center;}
.ni-404 h1{font-size:90px;color:var(--ni-accent);margin:0;}
.ni-404 p{color:var(--ni-muted);font-size:18px;}

/* ---------- 响应式（≤1024 折叠） ---------- */
@media (max-width:1024px){
  .ni-nav-toggle{display:block;}
  .ni-nav-links{position:fixed;top:var(--nav-h);left:0;right:0;background:var(--ni-navy);flex-direction:column;align-items:stretch;
    gap:0;padding:10px 16px;max-height:0;overflow:hidden;transition:max-height .25s ease;margin-left:0;}
  .ni-nav-links.open{max-height:90vh;overflow-y:auto;}
  .ni-nav-links>li{width:100%;}
  .ni-nav-links a,.ni-menu-btn{width:100%;text-align:left;color:#dfe6ee;}
  .ni-menu-panel{position:static;display:none;box-shadow:none;border:none;background:rgba(255,255,255,.04);padding:0 0 0 10px;}
  .ni-menu.open .ni-menu-panel{display:block;}
  .ni-menu-panel a{color:#dfe6ee;}
  .ni-hero h1{font-size:34px;}
  .ni-grid.cols-3,.ni-grid.cols-2{grid-template-columns:1fr;}
  .ni-scenarios{grid-template-columns:repeat(2,1fr);}
  /* 列表页：侧栏在前 → 单列，面板折叠由 details 处理 */
  .ni-list-layout .ni-layout-grid{grid-template-columns:1fr;}
  .ni-cat-side{position:static;}
  /* 详情页：单列，目录降级为 static 折叠面板（保留入口，不 display:none） */
  .ni-layout-grid{grid-template-columns:1fr;}
  .ni-content-main,.ni-page-main{max-width:100%;}
  .ni-toc-aside{position:static;max-height:none;}
  .ni-footer .container{grid-template-columns:1fr 1fr;}
}
@media (max-width:560px){
  .ni-scenarios{grid-template-columns:1fr;}
  .ni-archive-group ul{grid-template-columns:1fr;}
  .ni-footer .container{grid-template-columns:1fr;}
  .ni-capsule{right:12px;}
  .ni-card-pop{right:12px;}
  .ni-card-pop img{width:220px;height:auto;}
}