:root{
  --fkr-bg:#0B1A2F;
  --fkr-surface:#11243C;
  --fkr-surface-2:#16304E;
  --fkr-ink:#E8EEF6;
  --fkr-muted:#9FB2C8;
  --fkr-primary:#18A8C9;
  --fkr-accent:#E8923A;
  --fkr-line:#2A3F5C;
  --fkr-line-soft:#1E3450;
  --fkr-maxw:1200px;
  --fkr-h2-inset:0px;
  --fkr-header-h:64px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--fkr-bg);color:var(--fkr-ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.7;font-size:16px;padding-top:var(--fkr-header-h);
}
a{color:var(--fkr-primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* ===== Header ===== */
.fkr-header{position:fixed;top:0;left:0;right:0;height:var(--fkr-header-h);z-index:50;
  background:rgba(11,26,47,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--fkr-line)}
.fkr-header-inner{max-width:var(--fkr-maxw);margin:0 auto;height:100%;padding:0 24px;
  display:flex;align-items:center;gap:20px}
.fkr-logo{font-weight:700;color:var(--fkr-ink);font-size:18px;letter-spacing:.5px;white-space:nowrap}
.fkr-nav{display:flex;align-items:center;gap:18px;margin-left:auto;flex-wrap:nowrap}
.fkr-nav>a,.fkr-nav-group-btn{color:var(--fkr-muted);background:none;border:none;cursor:pointer;font-size:15px;font-family:inherit}
.fkr-nav>a:hover{color:var(--fkr-ink);text-decoration:none}
.fkr-nav-group{position:relative}
.fkr-nav-sub{position:absolute;top:100%;right:0;background:var(--fkr-surface);border:1px solid var(--fkr-line);
  border-radius:8px;padding:8px;min-width:170px;display:none;flex-direction:column;gap:2px}
.fkr-nav-group.open .fkr-nav-sub{display:flex}
.fkr-nav-sub a{padding:6px 10px;border-radius:6px;color:var(--fkr-muted);font-size:14px}
.fkr-nav-sub a:hover{background:var(--fkr-surface-2);color:var(--fkr-ink)}
.fkr-nav-toggle{display:none;background:none;border:none;color:var(--fkr-ink);font-size:22px;margin-left:auto;cursor:pointer}

/* ===== Container / layouts ===== */
.fkr-container{max-width:var(--fkr-maxw);margin:0 auto;padding:24px;padding-left:calc(24px + var(--fkr-h2-inset))}
.fkr-detail-layout,.fkr-list-layout{margin-top:8px}
.fkr-layout-grid{display:grid;gap:32px}
.fkr-detail-layout .fkr-layout-grid{grid-template-columns:minmax(0,1fr) 240px}
.fkr-list-layout .fkr-layout-grid{grid-template-columns:240px minmax(0,1fr)}
.fkr-content-main{min-width:0}
.fkr-toc-aside{position:sticky;top:calc(var(--fkr-header-h) + 16px);max-height:calc(100vh - var(--fkr-header-h) - 32px);overflow:auto}

/* ===== Breadcrumb ===== */
.fkr-breadcrumb{margin:0 0 14px;padding-left:var(--fkr-h2-inset)}
.fkr-breadcrumb-list{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:13px;color:var(--fkr-muted)}
.fkr-breadcrumb-list li{display:flex;align-items:center}
.fkr-breadcrumb-list li+li::before{content:"›";margin:0 6px;color:var(--fkr-line)}
.fkr-breadcrumb-list a{color:var(--fkr-muted)}
.fkr-breadcrumb-list span[aria-current]{color:var(--fkr-ink)}

/* ===== Headings / body ===== */
.fkr-h1{font-size:30px;line-height:1.3;margin:0 0 14px;color:#fff}
.fkr-summary{font-size:16px;color:var(--fkr-muted);background:var(--fkr-surface);border-left:3px solid var(--fkr-primary);
  padding:12px 16px;border-radius:6px;margin:0 0 14px}
.fkr-keywords{margin:0 0 14px;display:flex;flex-wrap:wrap;gap:8px}
.fkr-tag{background:var(--fkr-surface-2);color:var(--fkr-primary);border:1px solid var(--fkr-line);
  padding:2px 10px;border-radius:999px;font-size:13px}
.fkr-update{font-size:13px;color:var(--fkr-muted);margin:0 0 16px}
.fkr-article-body h2{font-size:22px;margin:28px 0 12px;padding-top:6px;color:#fff;border-left:3px solid var(--fkr-accent);padding-left:12px}
.fkr-article-body h3{font-size:18px;margin:20px 0 10px;color:#fff}
.fkr-article-body p{margin:0 0 14px}
.fkr-article-body ul,.fkr-article-body ol{padding-left:22px;margin:0 0 14px}
.fkr-article-body li{margin:4px 0}
.fkr-article-body blockquote{margin:14px 0;padding:12px 16px;background:var(--fkr-surface);border-radius:6px;
  border-left:3px solid var(--fkr-accent);color:var(--fkr-muted)}

/* ===== Tables (M26: cover all body tables) ===== */
.fkr-content-main table,.fkr-page-main table,table.fkr-spec{
  width:100%;border-collapse:collapse;margin:14px 0;font-size:14px;
  border:1px solid #cbd5e1;background:var(--fkr-surface)}
.fkr-content-main table th,.fkr-page-main table th,table.fkr-spec th{
  background:var(--fkr-primary);color:#04222b;text-align:left;padding:9px 12px;font-weight:600}
.fkr-content-main table td,.fkr-page-main table td,table.fkr-spec td{
  border:1px solid #cbd5e1;padding:8px 12px;color:var(--fkr-ink)}
.fkr-content-main table tr:nth-child(even) td,table.fkr-spec tr:nth-child(even) td{background:var(--fkr-surface-2)}

/* ===== TOC panel / category panel (responsive <details>) ===== */
.fkr-toc-panel,.fkr-cat-panel{background:var(--fkr-surface);border:1px solid var(--fkr-line);border-radius:8px;padding:12px 14px}
.fkr-toc-summary,.fkr-cat-summary{cursor:pointer;font-weight:600;color:var(--fkr-ink);list-style:none}
.fkr-toc-summary::after,.fkr-cat-summary::after{content:"▾";float:right;transition:transform .2s}
.fkr-toc-panel:not([open]) .fkr-toc-summary::after,.fkr-cat-panel:not([open]) .fkr-cat-summary::after{transform:rotate(-90deg)}
.fkr-toc-list{list-style:none;margin:10px 0 0;padding:0;font-size:14px}
.fkr-toc-list li{margin:4px 0}
.fkr-toc-lv3{padding-left:14px}
.fkr-toc-list a{color:var(--fkr-muted)}
.fkr-toc-list a:hover{color:var(--fkr-ink)}

/* ===== Category list (list page) ===== */
.fkr-cat-side{margin:0}
.fkr-category-list{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:2px}
.fkr-category-list a{display:block;padding:8px 12px;border-radius:6px;color:var(--fkr-muted);font-size:14px}
.fkr-category-list a:hover,.fkr-category-list a.active{background:var(--fkr-surface-2);color:var(--fkr-ink);text-decoration:none}

/* ===== FAQ ===== */
.fkr-faq{margin:28px 0 0}
.fkr-faq-title{font-size:22px;margin:0 0 12px;color:#fff}
.fkr-faq-item{border:1px solid var(--fkr-line);border-radius:8px;margin:8px 0;background:var(--fkr-surface);padding:0}
.fkr-faq-item summary{cursor:pointer;padding:12px 16px;font-weight:600;color:var(--fkr-ink)}
.fkr-faq-a{padding:0 16px 14px;color:var(--fkr-muted)}

/* ===== Cards / grids ===== */
.fkr-item-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:14px 0}
.fkr-item{display:block;background:var(--fkr-surface);border:1px solid var(--fkr-line);border-radius:10px;padding:18px;
  transition:border-color .2s,transform .2s;color:var(--fkr-ink)}
.fkr-item:hover{border-color:var(--fkr-primary);transform:translateY(-2px);text-decoration:none}
.fkr-item-title{font-size:17px;margin:0 0 8px;color:#fff}
.fkr-item-desc{font-size:14px;color:var(--fkr-muted);margin:0}
.fkr-item-static{cursor:default}

/* ===== List page ===== */
.fkr-list-desc{color:var(--fkr-muted);margin:0 0 18px}
.fkr-cat-side-wrap{}
.fkr-cat-content{min-width:0}

/* ===== Page wrap ===== */
.fkr-page-wrap{max-width:880px;margin:0 auto}
.fkr-page-main{background:var(--fkr-surface);border:1px solid var(--fkr-line);border-radius:12px;padding:48px}
.fkr-breadcrumb{padding-left:0}
.fkr-page-wrap .fkr-breadcrumb{padding-left:0}
.fkr-page-body h2{font-size:22px;margin:26px 0 12px;color:#fff;border-left:3px solid var(--fkr-accent);padding-left:12px}
.fkr-page-body h3{font-size:18px;margin:18px 0 10px;color:#fff}
.fkr-page-body p{margin:0 0 14px}
.fkr-page-body ul{padding-left:22px}
.fkr-page-body table{width:100%;border-collapse:collapse;margin:14px 0;border:1px solid #cbd5e1}
.fkr-page-body th{background:var(--fkr-primary);color:#04222b;padding:9px 12px}
.fkr-page-body td{border:1px solid #cbd5e1;padding:8px 12px}

/* ===== Product spec strip ===== */
.fkr-spec-strip{background:var(--fkr-surface);border:1px solid var(--fkr-accent);border-radius:10px;padding:14px 16px;margin-bottom:16px}
.fkr-spec-strip-title{font-size:15px;margin:0 0 10px;color:var(--fkr-accent)}
.fkr-spec-strip-list{list-style:none;margin:0;padding:0;font-size:13px}
.fkr-spec-strip-list li{display:flex;justify-content:space-between;gap:10px;padding:5px 0;border-bottom:1px dashed var(--fkr-line-soft)}
.fkr-spec-strip-list li:last-child{border-bottom:none}
.fkr-spec-strip-list span{color:var(--fkr-muted)}
.fkr-spec-strip-list b{color:var(--fkr-ink);font-weight:600}

/* ===== Hero / home ===== */
.fkr-hero{background:linear-gradient(135deg,#0B1A2F,#16304E);border:1px solid var(--fkr-line);border-radius:14px;padding:48px 32px;margin:8px 0 28px}
.fkr-hero-title{font-size:34px;margin:0 0 12px;color:#fff}
.fkr-hero-sub{font-size:17px;color:var(--fkr-muted);max-width:760px;margin:0 0 20px}
.fkr-hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.fkr-btn{display:inline-block;padding:10px 22px;border-radius:8px;border:1px solid var(--fkr-line);color:var(--fkr-ink);background:var(--fkr-surface)}
.fkr-btn:hover{text-decoration:none;border-color:var(--fkr-primary)}
.fkr-btn-primary{background:var(--fkr-primary);color:#04222b;border-color:var(--fkr-primary);font-weight:600}
.fkr-block{margin:28px 0}
.fkr-block-title{font-size:22px;margin:0 0 14px;color:#fff}
.fkr-block-split{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.fkr-keyword-cloud{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0}
.fkr-keyword-cloud li{background:var(--fkr-surface);border:1px solid var(--fkr-line);border-radius:999px;padding:6px 14px;color:var(--fkr-muted);font-size:14px}
.fkr-baseline-list{padding-left:20px;margin:0;color:var(--fkr-muted)}
.fkr-baseline-list li{margin:6px 0}
.fkr-archive-list{list-style:none;padding:0;margin:0 0 18px}
.fkr-archive-list li{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--fkr-line-soft)}
.fkr-archive-cat{color:var(--fkr-muted);font-size:13px}
.fkr-404{text-align:center;padding:60px 20px}

/* ===== Footer ===== */
.fkr-footer{margin-top:40px;border-top:1px solid var(--fkr-line);background:var(--fkr-surface)}
.fkr-footer-inner{max-width:var(--fkr-maxw);margin:0 auto;padding:32px 24px;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.fkr-footer-title{font-size:15px;color:#fff;margin:0 0 12px}
.fkr-footer-text{font-size:14px;color:var(--fkr-muted)}
.fkr-footer-list{list-style:none;padding:0;margin:0;font-size:14px;color:var(--fkr-muted)}
.fkr-footer-list li{margin:6px 0}
.fkr-footer-bottom{border-top:1px solid var(--fkr-line);padding:14px 24px;text-align:center;color:var(--fkr-muted);font-size:13px}

/* ===== Float capsule ===== */
.fkr-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px}
.fkr-float-btn{width:54px;height:54px;border-radius:999px;border:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--fkr-primary),var(--fkr-accent));color:#04222b;box-shadow:0 6px 18px rgba(0,0,0,.35)}
.fkr-float-btn:hover{filter:brightness(1.08)}
.fkr-float-ico{font-size:18px;line-height:1}
.fkr-float-txt{font-size:11px;margin-top:2px;font-weight:600}
.fkr-card-overlay{position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center}
.fkr-card-overlay[hidden]{display:none}
.fkr-card-box{position:relative;background:#fff;border-radius:10px;padding:8px}
.fkr-card-img{display:block;width:300px;height:500px;object-fit:contain}
.fkr-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:999px;border:none;background:#fff;color:#111;font-size:20px;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.3)}

/* ===== Pagination ===== */
.fkr-pagination{display:flex;gap:8px;margin:20px 0;flex-wrap:wrap}
.fkr-pagination a{padding:6px 14px;border:1px solid var(--fkr-line);border-radius:6px;color:var(--fkr-muted);font-size:14px}
.fkr-pagination a.active,.fkr-pagination a:hover{background:var(--fkr-primary);color:#04222b;border-color:var(--fkr-primary);text-decoration:none}

/* ===== Responsive (M25: breakpoint 1024, keep nav reachable, no display:none on toc/cat) ===== */
@media (max-width: 1024px){
  .fkr-detail-layout .fkr-layout-grid,.fkr-list-layout .fkr-layout-grid{grid-template-columns:1fr}
  .fkr-toc-aside{position:static;max-height:none;margin-top:18px}
  .fkr-cat-side-wrap{margin-bottom:18px}
  .fkr-nav{position:absolute;top:var(--fkr-header-h);left:0;right:0;background:var(--fkr-surface);
    flex-direction:column;align-items:stretch;padding:12px 24px;gap:10px;border-bottom:1px solid var(--fkr-line);display:none}
  .fkr-nav.open{display:flex}
  .fkr-nav-group{position:static}
  .fkr-nav-sub{position:static;display:flex;min-width:0;border:none;background:none;padding:0 0 0 12px}
  .fkr-nav-toggle{display:block}
  .fkr-block-split{grid-template-columns:1fr}
  .fkr-footer-inner{grid-template-columns:1fr}
  .fkr-page-main{padding:28px 20px}
}