:root{
  --navy:#15324f; --navy-2:#0f2438; --accent:#1f9e8f; --accent-2:#2bb3a3;
  --ink:#1c2733; --muted:#5c6b78; --line:#e4e9ee; --bg:#ffffff; --bg-alt:#f5f8fa;
  --radius:14px; --header-h:64px; --maxw:1100px;
  --h2-inset:0px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;padding-top:var(--header-h);
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.3;color:var(--navy);overflow-wrap:anywhere;word-break:break-word}
h1{font-size:34px;margin:.2em 0 .5em}
h2{font-size:26px;margin:1.6em 0 .7em;padding-bottom:.3em;border-bottom:2px solid var(--line)}
h3{font-size:20px;margin:1.3em 0 .5em}
p{margin:.7em 0}
ul,ol{padding-left:1.4em}
li{margin:.3em 0}

/* ===== Header / Nav ===== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);background:rgba(21,50,79,.96);
  backdrop-filter:blur(8px);z-index:1000;border-bottom:1px solid rgba(255,255,255,.08)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px}
.brand img{border-radius:8px;background:#fff;padding:2px}
.brand-name{letter-spacing:.5px}
.main-nav .nav-list{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.nav-item>a{display:block;color:#dce6ee;padding:8px 14px;border-radius:8px;font-size:15px}
.nav-item>a:hover{background:rgba(255,255,255,.1);text-decoration:none;color:#fff}
.nav-item.active>a{color:#fff;background:rgba(31,158,143,.25)}
.has-dropdown{position:relative}
.dropdown{position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:12px;
  box-shadow:0 12px 30px rgba(15,36,56,.18);min-width:180px;padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s}
.has-dropdown:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown ul{list-style:none;margin:0;padding:0}
.dropdown a{display:block;color:var(--ink);padding:8px 12px;border-radius:8px;font-size:14px}
.dropdown a:hover{background:var(--bg-alt)}
.nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.3);color:#fff;font-size:20px;
  border-radius:8px;padding:4px 10px;cursor:pointer}
.mobile-nav{background:var(--navy-2);border-top:1px solid rgba(255,255,255,.08);padding:10px 20px}
.mobile-nav[hidden]{display:none}
.m-group{margin:6px 0}
.m-group>summary{cursor:pointer;color:#cfe0ea;padding:8px 0;font-weight:600}
.m-group ul{list-style:none;margin:0;padding:0 0 6px 14px}
.m-group a{color:#dce6ee;display:block;padding:6px 0}
.m-pages{list-style:none;margin:6px 0 0;padding:0}
.m-pages a{color:#fff;display:block;padding:8px 0;border-top:1px solid rgba(255,255,255,.08)}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 60%,#102a40 100%);color:#fff;padding:64px 0 72px}
.hero-inner{display:flex;gap:40px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.hero-text{flex:1 1 480px}
.hero-eyebrow{color:var(--accent-2);font-weight:700;letter-spacing:2px;margin:0 0 10px;font-size:14px}
.hero h1{color:#fff;font-size:40px;margin:0 0 18px;line-height:1.25}
.hero-sub{color:#c6d6e2;font-size:17px;max-width:560px;margin:0 0 26px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:var(--accent);color:#fff;padding:12px 26px;border-radius:30px;font-weight:600}
.btn-primary:hover{background:var(--accent-2);text-decoration:none}
.btn-ghost{border:1px solid rgba(255,255,255,.4);color:#fff;padding:12px 26px;border-radius:30px;font-weight:600}
.btn-ghost:hover{border-color:#fff;text-decoration:none}
.hero-stats{flex:1 1 300px;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.stat{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:18px;text-align:center}
.stat-num{display:block;font-size:28px;font-weight:800;color:#fff}
.stat-label{display:block;font-size:13px;color:#bcd0dd;margin-top:4px}

/* ===== Sections ===== */
.section{padding:56px 0}
.section-alt{background:var(--bg-alt)}
.section-title{text-align:center;font-size:30px;margin:0 0 8px}
.section-lead{text-align:center;color:var(--muted);max-width:680px;margin:0 auto 32px}
.line-grid{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:0;margin:0}
.line-grid li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:.18s}
.line-grid li:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 10px 24px rgba(15,36,56,.08)}
.line-grid a{color:var(--navy);font-weight:700;font-size:17px}
.line-grid li:hover a{color:var(--accent)}
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.scene-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.scene-card h3{margin-top:0;color:var(--navy)}
.scene-card p{color:var(--muted);font-size:15px;margin:8px 0 0}
.article-mini{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:0}
.article-mini li{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.article-mini a{font-weight:600}
.more-link{text-align:center;margin-top:24px;font-weight:600}

/* ===== Article / Product layout ===== */
.article-grid{display:flex;gap:40px;align-items:flex-start;padding:32px 0}
.article-main{flex:1 1 auto;min-width:0;max-width:760px;margin:0 auto}
.toc-aside{flex:0 0 240px;position:sticky;top:calc(var(--header-h) + 20px);max-height:calc(100vh - var(--header-h) - 40px);overflow-y:auto}
.toc-title{font-size:14px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin:0 0 10px}
.toc ul{list-style:none;padding:0;margin:0;border-left:2px solid var(--line)}
.toc li a{display:block;padding:5px 12px;color:var(--muted);font-size:14px;border-left:2px solid transparent;margin-left:-2px}
.toc li a:hover{color:var(--accent);border-left-color:var(--accent);text-decoration:none}
.toc .toc-h3 a{padding-left:24px;font-size:13px}

/* breadcrumb：与正文 H2 同左缘（同在 article-main / cat-content 内，无额外内边距） */
.breadcrumb{margin:0 0 18px;font-size:14px;color:var(--muted)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:#aab6c0}
.breadcrumb a{color:var(--muted)}
.breadcrumb .bc-current{color:var(--navy);font-weight:600}

.kw-bar{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px}
.tag-text{background:var(--bg-alt);border:1px solid var(--line);color:var(--muted);font-size:13px;padding:3px 10px;border-radius:20px}
.update-time{display:inline-block;color:var(--muted);font-size:13px;margin:4px 0 18px}
.post h2{scroll-margin-top:calc(var(--header-h) + 16px)}
.post h3{scroll-margin-top:calc(var(--header-h) + 16px)}
table.data{border-collapse:collapse;width:100%;margin:18px 0;font-size:15px;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
table.data th,table.data td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.data thead th,table.data tbody tr:first-child td{background:var(--bg-alt);font-weight:600;color:var(--navy)}
blockquote.callout{border-left:4px solid var(--accent);background:var(--bg-alt);padding:14px 18px;margin:18px 0;border-radius:0 10px 10px 0;color:var(--ink)}
blockquote.callout p{margin:.3em 0}
blockquote:not(.callout){border-left:4px solid var(--line);padding:12px 18px;margin:18px 0;color:var(--muted)}

/* FAQ 裸 details */
.faq{margin:30px 0}
.faq-title{font-size:22px;color:var(--navy);border-bottom:2px solid var(--line);padding-bottom:.3em}
.faq details{border:1px solid var(--line);border-radius:10px;margin:10px 0;padding:0 16px;background:#fff}
.faq details[open]{background:var(--bg-alt)}
.faq summary{cursor:pointer;font-weight:600;padding:14px 0;color:var(--navy)}
.faq details p{margin:0 0 14px;color:var(--ink)}

/* list pages */
.list-grid{display:flex;gap:30px;padding:32px 0;align-items:flex-start}
.cat-side{flex:0 0 220px;position:sticky;top:calc(var(--header-h) + 20px)}
.cat-side-title{font-weight:700;color:var(--navy);margin-bottom:10px;font-size:15px}
.category-list{list-style:none;padding:0;margin:0}
.category-list li{margin:2px 0}
.category-list a{display:block;padding:9px 14px;border-radius:8px;color:var(--ink);border-left:3px solid transparent}
.category-list a:hover{background:var(--bg-alt);text-decoration:none}
.category-list li.active a{background:rgba(31,158,143,.12);border-left-color:var(--accent);color:var(--accent);font-weight:600}
.cat-content{flex:1 1 auto;min-width:0}
.list-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:8px}
.list-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;transition:.18s}
.list-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.list-card h3{margin:0 0 8px;font-size:18px}
.list-card h3 a{color:var(--navy)}
.list-card p{color:var(--muted);font-size:14px;margin:0}
.empty{color:var(--muted)}

/* page */
.page-wrap{max-width:820px;margin:0 auto;padding:32px 0}
.page-wrap.center{text-align:center}
.arc-list{columns:2;column-gap:30px}
.arc-list li{break-inside:avoid;margin:6px 0}

/* ===== Footer ===== */
.site-footer{background:var(--navy);color:#cdd9e2;margin-top:40px;padding:44px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:28px}
.footer-col h4{color:#fff;margin:0 0 12px;font-size:16px}
.footer-col ul{list-style:none;padding:0;margin:0}
.footer-col a{color:#bcd0dd;display:block;padding:4px 0;font-size:14px}
.footer-col p{font-size:14px;margin:6px 0}
.footer-note{color:#8ea3b3;font-size:13px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding:16px 20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#90a4b3}

/* ===== 悬浮胶囊（左侧中部，长胶囊） ===== */
.float-rail{position:fixed;left:16px;top:50%;transform:translateY(-50%);z-index:9999;
  display:flex;flex-direction:column;gap:10px;background:rgba(21,50,79,.94);padding:10px 8px;border-radius:30px;
  box-shadow:0 10px 30px rgba(15,36,56,.3);backdrop-filter:blur(6px)}
.rail-btn{border:none;background:transparent;color:#fff;cursor:pointer;width:48px;height:48px;border-radius:24px;
  font-size:12px;line-height:1.2;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  transition:.15s;font-family:inherit}
.rail-btn:hover{background:var(--accent);color:#fff}
.rail-btn[hidden]{display:none}

/* 企业微信名片弹层 */
.weixin-modal{position:fixed;inset:0;z-index:10000;display:flex;align-items:center;justify-content:center;
  padding:24px;background:rgba(15,36,56,.62);backdrop-filter:blur(3px)}
.weixin-modal[hidden]{display:none}
.weixin-modal-box{position:relative;background:#fff;border-radius:var(--radius);padding:20px 20px 18px;
  max-width:min(420px,92vw);max-height:calc(100vh - 48px);display:flex;flex-direction:column;overflow:hidden;
  box-shadow:0 18px 50px rgba(15,36,56,.35)}
.weixin-close{position:absolute;top:10px;right:12px;width:30px;height:30px;border:none;background:transparent;
  color:var(--muted);font-size:20px;line-height:1;cursor:pointer;border-radius:50%;font-family:inherit;z-index:2}
.weixin-close:hover{background:var(--bg-alt);color:var(--ink)}
.weixin-tip{margin:0 0 12px;font-size:14px;color:var(--muted);text-align:center;flex:none}
/* 名片为竖版长图（638×1016）：整体等比缩放到弹窗内，保证完整可见且不出现内部滚动条 */
.weixin-img-wrap{flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden}
.weixin-img-wrap img{display:block;max-width:100%;max-height:calc(100vh - 150px);
  width:auto;height:auto;object-fit:contain;border-radius:10px;border:1px solid var(--line)}
@media (max-width:640px){
  .weixin-modal{padding:12px}
  .weixin-modal-box{max-width:100%;max-height:calc(100vh - 24px);padding:16px 14px 14px}
  .weixin-img-wrap img{max-height:calc(100vh - 118px)}
}
/* ===== Responsive ===== */
@media (max-width:1024px){
  .article-grid{flex-direction:column;gap:20px}
  .toc-aside{position:static;flex:none;max-height:none;width:100%;order:2}
  .toc ul{border-left:none;display:flex;flex-wrap:wrap;gap:6px}
  .toc li a{border-left:none;border:1px solid var(--line);border-radius:20px;padding:4px 12px}
  .article-main{max-width:100%}
  .line-grid,.scene-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .main-nav{display:none}
  .nav-toggle{display:block}
  .hero h1{font-size:30px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .list-grid{flex-direction:column}
  .cat-side{position:static;flex:none;width:100%}
  .category-list{display:flex;flex-wrap:wrap;gap:8px}
  .category-list a{border-left:none;border:1px solid var(--line);border-radius:20px;padding:6px 12px}
  .category-list li.active a{border-color:var(--accent)}
  .list-cards,.article-mini{grid-template-columns:1fr}
  .arc-list{columns:1}
}
@media (max-width:640px){
  .line-grid,.scene-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  h1{font-size:26px}
  h2{font-size:22px}
}