:root{
  --bg:#0a1424;
  --bg-soft:#0f1d33;
  --panel:#ffffff;
  --ink:#16253b;
  --ink-soft:#46566e;
  --line:#e3e9f2;
  --primary:#0b5fff;
  --primary-d:#083bb3;
  --accent:#00c2c7;
  --cyan:#13d4e6;
  --radius:14px;
  --maxw:1180px;
  --shadow:0 10px 30px rgba(10,20,36,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#f4f7fb;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3,h4{line-height:1.3;color:var(--ink)}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:linear-gradient(120deg,#08182f 0%,#0c2748 55%,#0b3a52 100%);color:#fff;box-shadow:0 2px 18px rgba(0,0,0,.25)}
.header-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:24px;padding:14px 20px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand:hover{text-decoration:none}
.brand-mark{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:20px;background:linear-gradient(135deg,var(--primary),var(--cyan));color:#fff;box-shadow:0 6px 18px rgba(11,95,255,.45)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:17px}
.brand-text em{font-style:normal;font-size:12px;color:#9fc3e6}
.site-nav{display:flex;gap:18px;margin-left:auto;flex-wrap:wrap}
.site-nav a{color:#d6e6f7;font-size:14px;padding:6px 2px;border-bottom:2px solid transparent}
.site-nav a:hover{color:#fff;text-decoration:none;border-color:var(--cyan)}
.nav-toggle{display:none;background:none;border:1px solid #2c4straight;color:#fff;font-size:20px;margin-left:auto}

/* wrap + layout */
.wrap{max-width:var(--maxw);margin:0 auto;padding:22px 20px 60px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;align-items:start}
.main{min-width:0}
.main .article{max-width:760px;margin:0 auto}
@media (max-width:980px){.layout{grid-template-columns:1fr}.toc-aside{display:none}}

/* breadcrumb */
.breadcrumb{font-size:13px;color:var(--ink-soft);margin-bottom:16px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:0}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:8px;color:#aab6c8}
.breadcrumb span{color:var(--ink)}

/* hero (home) */
.hero{position:relative;border-radius:20px;overflow:hidden;background:radial-gradient(120% 140% at 0% 0%,#0c3358 0%,#0a1424 60%);color:#fff;padding:54px 44px;margin-bottom:26px}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(19,212,230,.35),transparent 70%)}
.hero h1{font-size:34px;margin:0 0 12px;position:relative}
.hero p{max-width:640px;color:#c7d8ec;position:relative;font-size:15px}
.hero .hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;position:relative}
.hero .hero-tags span{background:rgba(255,255,255,.08);border:1px solid rgba(19,212,230,.4);padding:6px 12px;border-radius:999px;font-size:13px;color:#dff3f8}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:transform .15s ease,border-color .15s ease}
.card:hover{transform:translateY(-3px);border-color:var(--primary)}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--ink-soft);font-size:14px}
.card .meta{margin-top:10px;font-size:12px;color:#8a99ad}
.section-title{font-size:22px;margin:34px 0 14px;padding-left:12px;border-left:4px solid var(--primary)}

/* article */
.article h1{font-size:28px;margin:0 0 10px}
.summary-block{background:linear-gradient(180deg,#eef4ff,#f6f9ff);border:1px solid #d8e6ff;border-left:4px solid var(--primary);border-radius:12px;padding:16px 18px;color:var(--ink);font-size:15px;margin:14px 0 18px}
.kw-line{font-size:13px;color:var(--ink-soft);margin-bottom:10px}
.kw-line b{color:var(--primary)}
.update-time{font-size:12px;color:#8a99ad;margin:6px 0 18px}
.article h2{font-size:21px;margin:30px 0 10px;padding-top:8px;border-top:1px dashed var(--line)}
.article h3{font-size:17px;margin:22px 0 8px}
.article p{margin:10px 0}
.article ul,.article ol{padding-left:22px;margin:10px 0}
.article li{margin:6px 0}

/* table */
table.data{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;background:#fff;box-shadow:var(--shadow);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{background:#0c2748;color:#fff;font-weight:600}
table.data tbody tr:nth-child(even){background:#f7fafd}
/* 正文/单页内的裸 markdown 表格也加边框 */
.article .body table,.leaf .body table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;background:#fff}
.article .body th,.article .body td,.leaf .body th,.leaf .body td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.article .body thead th,.leaf .body thead th{background:#eef4fb;color:#0c2748;font-weight:600}
.article .body tbody tr:nth-child(even),.leaf .body tbody tr:nth-child(even){background:#f7fafd}

/* callout / conclusion */
.conclusion{background:#0c2748;color:#eaf2ff;border-radius:12px;padding:16px 18px;margin:18px 0}
.conclusion p{margin:6px 0;color:#dce9ff}
.conclusion b{color:#9fe9f3}
blockquote.note{border-left:4px solid var(--accent);background:#eafafa;padding:10px 14px;color:#14555a;margin:14px 0;border-radius:8px}
.experience{background:#fff7e8;border:1px solid #f3dca0;border-left:4px solid #e6a700;border-radius:10px;padding:12px 16px;margin:16px 0;color:#6b5212;font-size:14px}
.author-block{background:#e8fbf6;border:1px solid #bfe9dd;border-left:4px solid #0d9488;border-radius:10px;padding:12px 16px;margin:16px 0;color:#1f5d52;font-size:13.5px}

/* FAQ bare details */
details.faq{border:1px solid var(--line);border-radius:10px;margin:10px 0;background:#fff;overflow:hidden}
details.faq summary{cursor:pointer;padding:12px 16px;font-weight:600;list-style:none;position:relative;background:#f8fbff}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";position:absolute;right:16px;color:var(--primary);font-size:18px}
details.faq[open] summary::after{content:"−"}
details.faq .faq-a{padding:0 16px 14px;color:var(--ink-soft)}
.faq-title{font-size:18px;margin:26px 0 8px}

/* related */
.related{margin-top:30px;border-top:1px solid var(--line);padding-top:18px}
.related h2{font-size:18px;border:0;padding:0;margin:0 0 12px}
.related ul{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.related li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.related li a{font-weight:600}
.related li span{display:block;color:var(--ink-soft);font-size:13px;margin-top:4px}

/* toc */
.toc-aside{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow-y:auto}
.toc-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;box-shadow:var(--shadow)}
.toc-title{font-size:13px;font-weight:700;color:var(--ink-soft);margin:0 0 8px}
#toc ul{list-style:none;margin:0;padding:0}
#toc .toc-lv2 a{display:block;padding:5px 0;font-size:13px;color:var(--ink-soft);border-left:2px solid transparent;padding-left:10px}
#toc .toc-lv3 a{display:block;padding:4px 0 4px 22px;font-size:12px;color:#8a99ad}
#toc a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}

/* category list */
.cat-side{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;box-shadow:var(--shadow)}
.cat-side ul.category-list{list-style:none;margin:0;padding:0}
.cat-side ul.category-list li{margin:2px 0}
.cat-side ul.category-list a{display:block;padding:9px 12px;border-radius:8px;color:var(--ink);font-size:14px}
.cat-side ul.category-list a:hover,.cat-side ul.category-list a.active{background:#eef4ff;color:var(--primary);text-decoration:none;font-weight:600}

/* footer */
.site-footer{background:#08182f;color:#c7d8ec;margin-top:40px}
.footer-inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;padding:40px 20px 20px}
.footer-col h3{color:#fff;font-size:15px;margin:0 0 12px}
.footer-col p,.footer-col li{font-size:13px;color:#aebfd2}
.footer-col ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.footer-col a{color:#aebfd2}
.footer-bottom{border-top:1px solid #16324f;padding:14px 20px;font-size:12px;color:#7e93ab;text-align:center}

/* float capsule left-middle */
.float-capsule{position:fixed;left:18px;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:12px;z-index:60}
.cap{display:flex;flex-direction:column;align-items:center;gap:3px;width:58px;height:58px;border-radius:18px;border:1px solid rgba(19,212,230,.5);background:rgba(12,39,72,.92);color:#dff3f8;cursor:pointer;box-shadow:0 8px 22px rgba(0,0,0,.3);backdrop-filter:blur(4px);font-size:11px;justify-content:center}
.cap:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.cap svg{display:block}
.cap-top{opacity:0;pointer-events:none;transition:opacity .25s}
.cap-top.show{opacity:1;pointer-events:auto}
@media (max-width:600px){.float-capsule{left:8px}.cap{width:50px;height:50px}}

/* wechat modal */
.wechat-modal{position:fixed;inset:0;z-index:80;display:grid;place-items:center}
.wechat-modal[hidden]{display:none}
.wechat-modal-mask{position:absolute;inset:0;background:rgba(6,14,26,.7)}
.wechat-modal-card{position:relative;background:#fff;border-radius:16px;padding:18px;box-shadow:0 20px 60px rgba(0,0,0,.4);text-align:center}
.wechat-tip{font-size:13px;color:var(--ink-soft);margin:0 0 10px}
.wechat-modal-card img{display:block;border-radius:8px;width:min(340px,82vw);height:auto;object-fit:contain;background:#fff}
.wechat-close{position:absolute;right:-12px;top:-12px;width:32px;height:32px;border-radius:50%;border:0;background:#0c2748;color:#fff;font-size:20px;cursor:pointer;line-height:1}

/* list page layout with sidebar */
.cat-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:28px}
@media (max-width:820px){.cat-layout{grid-template-columns:1fr}}
.pager{margin-top:20px;font-size:13px;color:var(--ink-soft)}

/* product page */
.product-head{display:grid;grid-template-columns:1fr;gap:14px}
.param-table{margin:14px 0}
.scenario{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0}
.scenario b{color:var(--primary)}

/* page (about/privacy) */
.leaf{max-width:820px;margin:0 auto}
.leaf h1{font-size:28px}
.leaf section{margin:18px 0}