/* ===== K 连接器技术平台 · 原创明亮科技风 ===== */
:root{
  --ink:#0b1f3a; --ink-2:#13315c; --accent:#1f8bff; --accent-2:#19d3c5;
  --bg:#eef3fb; --card:#ffffff; --line:#cbd5e1; --line-soft:#e3e9f3;
  --text:#1c2738; --muted:#5b6b82; --warn:#b45309;
  --h2-inset:16px;        /* 文章/列表/产品 正文与面包屑左缘 */
  --radius:14px; --shadow:0 10px 30px rgba(15,40,80,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3,h4,h5,h6{font-family:inherit;color:var(--ink);line-height:1.3;font-weight:700}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* ===== 顶部固定导航 ===== */
.kb-header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(11,31,58,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.08)}
.kb-header-inner{max-width:1180px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;justify-content:space-between}
.kb-logo{color:#fff;font-weight:800;font-size:19px;letter-spacing:.5px;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.kb-nav{display:flex;gap:22px}
.kb-nav a{color:#cfe0f5;font-size:15px;font-weight:500}
.kb-nav a:hover{color:#fff;text-decoration:none}
.kb-nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.kb-nav-toggle span{width:24px;height:2px;background:#fff;display:block;border-radius:2px}

/* ===== 通用布局 ===== */
.kb-layout,.kb-list-layout{padding-top:84px}
.kb-grid{display:grid;gap:32px;max-width:1180px;margin:0 auto;padding:24px 20px 60px}
.kb-layout .kb-grid{grid-template-columns:minmax(0,1fr) 240px}      /* 详情：内容 + 右 TOC */
.kb-list-layout .kb-grid{grid-template-columns:240px minmax(0,1fr)} /* 列表：左分类 + 内容 */
.kb-content,.kb-cat-content{background:var(--card);border:1px solid var(--line-soft);
  border-radius:var(--radius);padding:28px var(--h2-inset);box-shadow:var(--shadow);min-width:0}
.kb-page-wrap{padding:84px 20px 60px}
.kb-page-card{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);
  max-width:920px;margin:0 auto;padding:36px 48px;box-shadow:var(--shadow)}
.kb-page-card .kb-breadcrumb{padding-left:0}
.kb-article{margin-top:8px}

/* ===== 面包屑（左缘与 H2 对齐）===== */
.kb-breadcrumb{font-size:13.5px;color:var(--muted);margin:0 0 18px;padding:0}
.kb-breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0}
.kb-breadcrumb li{display:flex;align-items:center;gap:8px}
.kb-breadcrumb li:not(:last-child)::after{content:"›";color:#aab6c8}
.kb-breadcrumb a{color:var(--muted)}
.kb-breadcrumb span[aria-current]{color:var(--ink);font-weight:600}

/* ===== 文章排版 ===== */
.kb-article h1{font-size:30px;margin:.1em 0 .4em}
.kb-article h2{font-size:22px;margin:1.6em 0 .7em;padding-bottom:.3em;border-bottom:2px solid var(--line-soft)}
.kb-article h3{font-size:18px;margin:1.3em 0 .5em}
.kb-article p{margin:.6em 0}
.kb-article ul,.kb-article ol{padding-left:1.4em;margin:.6em 0}
.kb-article li{margin:.3em 0}
.kb-article blockquote{margin:1em 0;padding:12px 16px;background:#f2f7ff;border-left:4px solid var(--accent);border-radius:8px;color:var(--ink-2)}
.kb-article code{background:#eef2f8;padding:2px 6px;border-radius:5px;font-size:14px}
.kb-article time{display:inline-block;font-size:13px;color:var(--muted);margin:.3em 0 1em}
.kb-tag{display:inline-block;background:#eaf2ff;color:var(--ink-2);border:1px solid #d4e3ff;
  border-radius:999px;padding:2px 12px;font-size:13px;margin:2px 4px 2px 0}

/* ===== 表格（M26：覆盖全部正文 table，含 Markdown 裸 table）===== */
.kb-article table,.kb-page-card table,table.spec{border-collapse:collapse;width:100%;margin:1.1em 0;
  font-size:14.5px;border:1px solid var(--line)}
.kb-article table th,.kb-page-card table th,table.spec th{background:var(--ink);color:#fff;
  text-align:left;padding:10px 12px;font-weight:600;border:1px solid var(--line)}
.kb-article table td,.kb-page-card table td,table.spec td{padding:9px 12px;border:1px solid var(--line);vertical-align:top}
.kb-article table tr:nth-child(even) td,.kb-page-card table tr:nth-child(even) td,table.spec tr:nth-child(even) td{background:#f6f9fe}

/* ===== 目录 / 分类侧栏（原生 details 折叠）===== */
.kb-toc,.kb-cat-side{position:sticky;top:84px;align-self:start}
.toc-panel,.cat-panel{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);
  padding:12px 14px;box-shadow:var(--shadow)}
.toc-panel summary,.cat-panel summary{cursor:pointer;font-weight:700;color:var(--ink);
  list-style:none;padding:4px 0;display:flex;align-items:center;gap:8px}
.toc-panel summary::after,.cat-panel summary::after{content:"▾";margin-left:auto;transition:transform .2s;color:var(--muted)}
.toc-panel[open] summary::after,.cat-panel[open] summary::after{transform:rotate(180deg)}
.kb-toc-list{list-style:none;margin:8px 0 0;padding:0;font-size:14px}
.kb-toc-list li{margin:4px 0}
.kb-toc-l3{padding-left:14px}
.kb-toc-list a{color:var(--muted)}
.kb-toc-list a:hover{color:var(--accent)}
.category-list{list-style:none;margin:8px 0 0;padding:0}
.category-list li{margin:2px 0}
.category-list a{display:block;padding:8px 12px;border-radius:9px;color:var(--ink-2);font-weight:500}
.category-list a:hover{background:#eef4ff;text-decoration:none}
.category-list li.active a{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#fff}

/* ===== FAQ ===== */
.kb-faq{margin:2em 0 1em}
.kb-faq h2{font-size:22px;margin:0 0 .6em}
.kb-faq-item{border:1px solid var(--line-soft);border-radius:10px;margin:.5em 0;background:#fbfdff}
.kb-faq-item summary{cursor:pointer;padding:12px 16px;font-weight:600;color:var(--ink)}
.kb-faq-a{padding:0 16px 14px;color:var(--text)}

/* ===== 案例 callout ===== */
.kb-case{margin:1.6em 0;padding:14px 18px;background:#fff7ed;border-left:4px solid var(--warn);border-radius:10px}
.kb-case h4{margin:0 0 .3em;color:var(--warn)}
.kb-case p{margin:0}

/* ===== 卡片网格（首页/列表卡片）===== */
.kb-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;margin:1.2em 0}
.kb-card{background:var(--card);border:1px solid var(--line-soft);border-radius:12px;padding:18px;
  box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}
.kb-card:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(15,40,80,.14)}
.kb-card h3{margin:.1em 0 .4em;font-size:17px}
.kb-card p{margin:.3em 0;color:var(--muted);font-size:14px}
.kb-card .kb-more{font-weight:600;color:var(--accent)}

/* ===== 首页 hero ===== */
.kb-hero{background:radial-gradient(1200px 500px at 70% -10%,rgba(25,211,197,.25),transparent),
  linear-gradient(135deg,var(--ink),var(--ink-2));color:#fff;padding:88px 20px 64px;margin-top:64px}
.kb-hero-inner{max-width:1180px;margin:0 auto}
.kb-hero h1{color:#fff;font-size:40px;margin:0 0 .3em}
.kb-hero p{color:#cfe0f5;font-size:18px;max-width:760px}
.kb-hero .kb-cta{display:flex;gap:14px;margin-top:24px;flex-wrap:wrap}
.kb-btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:600}
.kb-btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#fff}
.kb-btn.ghost{border:1px solid rgba(255,255,255,.4);color:#fff}
.kb-section{max-width:1180px;margin:0 auto;padding:40px 20px}
.kb-section h2{font-size:26px;margin:0 0 .2em}
.kb-section .kb-sub{color:var(--muted);margin:0 0 18px}
.kb-stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-top:8px}
.kb-stat .item{background:var(--card);border:1px solid var(--line-soft);border-radius:12px;padding:18px;text-align:center;box-shadow:var(--shadow)}
.kb-stat .num{font-size:30px;font-weight:800;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.kb-stat .lbl{color:var(--muted);font-size:14px}

/* ===== 页脚 ===== */
.kb-footer{background:var(--ink);color:#cfe0f5;margin-top:40px}
.kb-footer-inner{max-width:1180px;margin:0 auto;padding:40px 20px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.kb-footer h4{color:#fff;margin:0 0 12px;font-size:16px}
.kb-footer p{font-size:14px;color:#9fb4d4}
.kb-footer ul{list-style:none;margin:0;padding:0}
.kb-footer li{margin:6px 0}
.kb-footer a{color:#cfe0f5}
.kb-footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:14px 20px;text-align:center;font-size:13px;color:#7f95b8}

/* ===== 悬浮胶囊 ===== */
.kb-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;
  display:flex;flex-direction:column;gap:8px;background:linear-gradient(160deg,var(--accent),var(--accent-2));
  padding:10px 8px;border-radius:999px;box-shadow:0 10px 28px rgba(15,40,80,.3)}
.kb-cap-btn{width:46px;height:46px;border:0;border-radius:50%;background:rgba(255,255,255,.16);color:#fff;
  font-size:15px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center}
.kb-cap-btn:hover{background:rgba(255,255,255,.32);text-decoration:none}
.kb-card-modal{position:fixed;inset:0;z-index:80;background:rgba(8,18,36,.6);display:flex;align-items:center;justify-content:center}
.kb-card-modal[hidden]{display:none}
.kb-card-inner{position:relative;background:#fff;border-radius:14px;padding:10px;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.kb-card-inner img{display:block;width:300px;height:500px;object-fit:contain;border-radius:8px}
.kb-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border:0;border-radius:50%;
  background:#fff;color:var(--ink);font-size:20px;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.3)}

/* ===== 分页 ===== */
.kb-pagination{display:flex;gap:8px;margin:24px 0;flex-wrap:wrap}
.kb-pagination a{padding:7px 13px;border:1px solid var(--line);border-radius:8px;color:var(--ink-2);background:#fff}
.kb-pagination a.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ===== 响应式（断点 1024，与 JS matchMedia 一致）===== */
@media (max-width:1024px){
  .kb-layout .kb-grid,.kb-list-layout .kb-grid{grid-template-columns:1fr}
  .kb-toc,.kb-cat-side{position:static;top:auto}
  .kb-nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--ink);
    flex-direction:column;gap:0;padding:8px 20px 16px}
  .kb-nav.open{display:flex}
  .kb-nav a{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08)}
  .kb-nav-toggle{display:flex}
  .kb-hero h1{font-size:30px}
  .kb-footer-inner{grid-template-columns:1fr}
}
@media (max-width:560px){
  .kb-page-card{padding:24px 18px}
  .kb-content,.kb-cat-content{padding:20px 14px}
  :root{--h2-inset:14px}
}