:root{
  --bg:#0b1020; --bg-2:#0f172a; --panel:#121a2e; --panel-2:#172033;
  --line:#22304d; --text:#e7ecf5; --muted:#9fb0c9; --dim:#6b7c99;
  --brand:#3b82f6; --brand-2:#06b6d4; --accent:#38e1c4;
  --radius:14px; --maxw:1200px; --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:radial-gradient(1200px 600px at 70% -10%, #14223f 0%, var(--bg) 55%) fixed;
  color:var(--text); font:16px/1.7 "Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand-2); text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%}
.container{max-width:var(--maxw); margin:0 auto; padding:0 22px}
hr{border:none; border-top:1px solid var(--line); margin:28px 0}

/* Header */
.site-header{position:sticky; top:0; z-index:50; backdrop-filter:blur(10px);
  background:rgba(11,16,32,.82); border-bottom:1px solid var(--line)}
.header-inner{display:flex; align-items:center; justify-content:space-between; height:64px}
.brand{display:flex; align-items:center; gap:10px; color:var(--text); font-weight:700}
.brand-name{font-size:16px; letter-spacing:.3px}
.main-nav{display:flex; gap:22px; flex-wrap:wrap}
.main-nav a{color:var(--muted); font-size:14.5px; font-weight:500}
.main-nav a:hover{color:var(--text)}

/* Hero */
.hero{position:relative; padding:84px 0 70px; overflow:hidden}
.hero::before{content:""; position:absolute; inset:-20% -10% auto -10%; height:420px;
  background:radial-gradient(600px 300px at 30% 20%, rgba(59,130,246,.28), transparent 70%),
             radial-gradient(500px 300px at 80% 10%, rgba(6,182,212,.22), transparent 70%); filter:blur(8px)}
.hero-inner{position:relative; max-width:880px}
.hero-eyebrow{color:var(--brand-2); letter-spacing:3px; font-size:13px; font-weight:700; text-transform:uppercase}
.hero-title{font-size:clamp(32px,5vw,52px); line-height:1.15; margin:14px 0 18px; font-weight:800;
  background:linear-gradient(120deg,#fff,#bcd4ff); -webkit-background-clip:text; background-clip:text; color:transparent}
.hero-sub{color:var(--muted); font-size:17px; max-width:760px}
.hero-actions{display:flex; gap:14px; margin:26px 0 30px}
.btn-primary{display:inline-flex; align-items:center; justify-content:center; padding:12px 22px; border-radius:10px;
  background:linear-gradient(120deg,var(--brand),var(--brand-2)); color:#fff; font-weight:700; border:none; cursor:pointer; font-size:15px}
.btn-primary:hover{color:#fff; filter:brightness(1.08)}
.btn-ghost{display:inline-flex; align-items:center; padding:12px 22px; border-radius:10px; border:1px solid var(--line); color:var(--text); font-weight:600}
.btn-ghost:hover{border-color:var(--brand); color:#fff}
.btn-lg{padding:14px 28px; font-size:16px}
.hero-stats{display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-top:10px}
.hero-stats li{list-style:none; background:var(--panel); border:1px solid var(--line); border-radius:12px; padding:16px}
.hero-stats strong{display:block; font-size:20px; color:#fff}
.hero-stats span{color:var(--dim); font-size:13px}

/* Sections */
.section{padding:60px 0}
.section-alt{background:linear-gradient(180deg, rgba(255,255,255,.02), transparent)}
.section-head{margin-bottom:30px; max-width:760px}
.section-head h2{font-size:30px; margin:0 0 10px; font-weight:800}
.section-head p{color:var(--muted); margin:0}
.section-more{margin-top:22px}
.section-more a{font-weight:700}

/* Capability grid */
.cap-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
.cap-card{background:var(--panel); border:1px solid var(--line); border-radius:var(--radius); padding:24px; transition:.2s}
.cap-card:hover{transform:translateY(-4px); border-color:var(--brand); box-shadow:var(--shadow)}
.cap-card h3{margin:0 0 10px; font-size:18px}
.cap-card p{color:var(--muted); font-size:14.5px; margin:0 0 14px}
.cap-card a{font-weight:700; font-size:14px}

/* Post grid */
.post-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
.post-card{display:block; background:var(--panel); border:1px solid var(--line); border-radius:var(--radius); padding:22px; transition:.2s; color:var(--text)}
.post-card:hover{transform:translateY(-4px); border-color:var(--brand); box-shadow:var(--shadow); color:var(--text)}
.post-cat{display:inline-block; font-size:12px; color:var(--brand-2); border:1px solid var(--line); border-radius:999px; padding:3px 10px; margin-bottom:10px}
.post-card h3{margin:0 0 8px; font-size:17px; line-height:1.4}
.post-card p{color:var(--muted); font-size:14px; margin:0}

/* Article layout */
.article-layout{display:grid; grid-template-columns:minmax(0,760px) 240px; gap:40px; padding:36px 0}
.article-main{min-width:0}
.article-title{font-size:30px; line-height:1.3; margin:0 0 18px; font-weight:800}
.article-meta{margin:0 0 22px; font-size:13px; color:var(--muted); display:flex; gap:8px; flex-wrap:wrap}
.article-meta time{font-variant-numeric:tabular-nums}
.summary-block{background:linear-gradient(120deg,rgba(59,130,246,.12),rgba(6,182,212,.08)); border:1px solid var(--line);
  border-left:3px solid var(--brand); border-radius:10px; padding:16px 18px; color:var(--text); font-size:15.5px}
.keyword-line{color:var(--brand-2); font-size:13.5px; margin:14px 0; font-weight:600}
.keyword-line strong{color:var(--text)}
.update-time{color:var(--dim); font-size:13px; margin:6px 0 18px}
.conclusion-block{border-left:3px solid var(--accent); background:rgba(56,225,196,.07); border-radius:10px; padding:14px 18px; margin:18px 0}
.conclusion-block strong{color:var(--accent)}

/* Content typography */
.article-main h2{font-size:23px; margin:34px 0 12px; padding-top:8px; font-weight:800; scroll-margin-top:90px}
.article-main h3{font-size:18px; margin:24px 0 10px; scroll-margin-top:90px}
.article-main p{margin:12px 0; color:#dbe4f2}
.article-main ul, .article-main ol{margin:12px 0; padding-left:22px; color:#dbe4f2}
.article-main li{margin:6px 0}
.article-main code{background:var(--panel-2); border:1px solid var(--line); border-radius:6px; padding:1px 6px; font-size:13.5px; color:var(--accent)}
.article-main blockquote{border-left:3px solid var(--brand); background:var(--panel); border-radius:10px; padding:14px 18px; margin:18px 0; color:var(--muted)}
table.data{width:100%; border-collapse:collapse; margin:18px 0; font-size:14.5px; background:var(--panel); border-radius:10px; overflow:hidden}
table.data th, table.data td{border:1px solid var(--line); padding:10px 12px; text-align:left}
table.data th{background:var(--panel-2); color:#fff; font-weight:700}
table.data td{color:#dbe4f2}

/* TOC */
.toc-aside{position:sticky; top:84px; max-height:calc(100vh - 110px); overflow-y:auto; align-self:start}
.toc-title{font-size:13px; color:var(--dim); text-transform:uppercase; letter-spacing:1.5px; margin-bottom:10px}
#toc ul{list-style:none; margin:0; padding:0; border-left:1px solid var(--line)}
#toc li{margin:0}
#toc a{display:block; padding:6px 12px; color:var(--muted); font-size:13.5px; border-left:2px solid transparent; margin-left:-1px}
#toc a:hover{color:var(--text); border-left-color:var(--brand)}
#toc .toc-h3 a{padding-left:26px; font-size:13px}

/* FAQ */
.faq{margin:30px 0; border-top:1px solid var(--line); padding-top:18px}
.faq details{border:1px solid var(--line); border-radius:10px; background:var(--panel); margin:10px 0; overflow:hidden}
.faq summary{cursor:pointer; padding:14px 18px; font-weight:700; color:#fff; list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+"; color:var(--brand-2); margin-right:10px; font-weight:800}
.faq details[open] summary::before{content:"−"}
.faq-a{padding:0 18px 16px; color:var(--muted); font-size:14.5px}

/* Related */
.related-reading{margin-top:30px; border-top:1px solid var(--line); padding-top:18px}
.related-reading h2{font-size:20px; margin:0 0 12px}
.related-reading ul{padding-left:20px}
.related-reading li{margin:8px 0; color:#dbe4f2}

/* Breadcrumb */
.breadcrumb{padding:18px 0 0; font-size:13.5px; color:var(--dim)}
.breadcrumb ol{list-style:none; margin:0; padding:0; display:flex; flex-wrap:wrap; gap:8px}
.breadcrumb li:not(:last-child)::after{content:"›"; margin-left:8px; color:var(--dim)}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{color:var(--text)}

/* List pages */
.list-layout{display:grid; grid-template-columns:220px 1fr; gap:34px; padding:30px 0 50px}
.cat-side{position:sticky; top:84px; align-self:start; border:1px solid var(--line); border-radius:12px; background:var(--panel); padding:14px}
.cat-title{font-size:12px; color:var(--dim); text-transform:uppercase; letter-spacing:1.5px; margin-bottom:10px}
.category-list{list-style:none; margin:0; padding:0}
.category-list li{margin:2px 0}
.category-list a{display:block; padding:9px 12px; border-radius:8px; color:var(--muted); font-size:14.5px}
.category-list a:hover{background:var(--panel-2); color:#fff}
.category-list li.active a{background:linear-gradient(120deg,var(--brand),var(--brand-2)); color:#fff; font-weight:700}
.list-head h1{font-size:28px; margin:0 0 6px}
.list-desc{color:var(--muted); margin:0 0 18px}
.item-list{list-style:none; margin:0; padding:0}
.item-row{padding:18px 0; border-bottom:1px solid var(--line)}
.item-title{font-size:18px; font-weight:700; color:#fff}
.item-summary{color:var(--muted); font-size:14.5px; margin:6px 0}
.item-meta{display:flex; gap:12px; align-items:center; font-size:13px; color:var(--dim)}
.item-cat{color:var(--brand-2); border:1px solid var(--line); border-radius:999px; padding:2px 10px}
.pagination{margin-top:22px; display:flex; gap:14px; align-items:center; color:var(--muted)}

/* Page (about/privacy) */
.page-layout{padding:40px 0 60px; max-width:860px; margin:0 auto}
.page-title{font-size:30px; margin:0 0 20px; font-weight:800}
.page-article h2{font-size:22px; margin:28px 0 10px}
.page-article p{color:#dbe4f2}
.page-article ul{padding-left:22px; color:#dbe4f2}
.center{text-align:center}

/* Footer */
.site-footer{margin-top:60px; border-top:1px solid var(--line); background:var(--bg-2)}
.footer-inner{display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:30px; padding:46px 0 30px}
.footer-col h3{font-size:15px; margin:0 0 14px; color:#fff}
.footer-col p{color:var(--muted); font-size:14px}
.footer-col ul{list-style:none; margin:0; padding:0}
.footer-col li{margin:8px 0}
.footer-col a{color:var(--muted); font-size:14px}
.footer-bottom{border-top:1px solid var(--line); padding:16px 0; color:var(--dim); font-size:13px}
.footer-bottom .container{display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px}

/* Float capsule */
.float-capsule{position:fixed; right:18px; top:50%; transform:translateY(-50%); z-index:60;
  display:flex; flex-direction:column; gap:10px}
.capsule-btn{width:52px; height:52px; border-radius:26px; border:1px solid var(--line); background:rgba(18,26,46,.9);
  backdrop-filter:blur(8px); color:var(--text); display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:2px; cursor:pointer; font-size:11px; font-weight:600; box-shadow:var(--shadow); transition:.2s}
.capsule-btn:hover{border-color:var(--brand); color:#fff; transform:scale(1.05)}
.capsule-btn svg{display:block}

/* Card modal */
.card-modal{position:fixed; inset:0; z-index:100; display:flex; align-items:center; justify-content:center}
.card-modal[hidden]{display:none}
.card-modal-backdrop{position:absolute; inset:0; background:rgba(3,7,18,.78); backdrop-filter:blur(4px)}
.card-modal-panel{position:relative; background:var(--panel); border:1px solid var(--line); border-radius:16px; padding:18px;
  box-shadow:var(--shadow); text-align:center}
.card-modal-imgwrap{width:300px; height:500px; border-radius:12px; overflow:hidden; background:var(--panel-2); display:flex; align-items:center; justify-content:center}
.card-modal-imgwrap img{width:300px; height:500px; object-fit:contain; display:block}
.card-modal-close{position:absolute; top:-12px; right:-12px; width:34px; height:34px; border-radius:50%; border:1px solid var(--line);
  background:var(--bg); color:#fff; font-size:18px; cursor:pointer; line-height:1}
.card-modal-tip{color:var(--muted); font-size:13px; margin:12px 0 0}

/* Card page */
.card-hero{padding:70px 0}
.card-hero-inner{display:grid; grid-template-columns:360px 1fr; gap:50px; align-items:center}
.card-mock{background:linear-gradient(160deg,var(--panel-2),var(--panel)); border:1px solid var(--line); border-radius:18px; padding:22px; box-shadow:var(--shadow)}
.card-mock-top{display:flex; align-items:center; gap:12px; padding-bottom:14px; border-bottom:1px solid var(--line)}
.card-mock-name{font-weight:800; color:#fff; margin:0}
.card-mock-tag{color:var(--brand-2); font-size:13px; margin:2px 0 0}
.card-mock-body{padding:14px 0; color:var(--muted); font-size:14.5px}
.card-mock-body ul{padding-left:20px; margin:10px 0 0}
.card-mock-foot{display:flex; align-items:center; justify-content:space-between; gap:12px; padding-top:14px; border-top:1px solid var(--line); color:var(--dim); font-size:13px}
.card-copy .hero-eyebrow{margin-bottom:8px}
.card-copy h1{font-size:clamp(26px,4vw,40px); margin:0 0 14px; font-weight:800}
.card-lead{color:var(--muted); font-size:16px; max-width:620px}
.card-points{margin:24px 0; display:grid; gap:14px}
.card-point{display:flex; gap:14px; align-items:flex-start; background:var(--panel); border:1px solid var(--line); border-radius:12px; padding:16px}
.card-point span{color:var(--brand-2); font-weight:800; font-size:18px; min-width:28px}
.card-point p{margin:0; color:var(--muted); font-size:14.5px}

/* Archive */
.archive-list{list-style:none; padding:0; margin:10px 0 30px}
.archive-list li{padding:8px 0; border-bottom:1px solid var(--line); color:var(--muted); font-size:14.5px}
.archive-list time{color:var(--dim); margin-right:8px}

/* Responsive */
@media (max-width:980px){
  .cap-grid,.post-grid{grid-template-columns:repeat(2,1fr)}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .article-layout{grid-template-columns:1fr}
  .toc-aside{display:none}
  .list-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .card-hero-inner{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
}
@media (max-width:620px){
  .cap-grid,.post-grid,.hero-stats{grid-template-columns:1fr}
  .main-nav{gap:14px; font-size:13px}
  .float-capsule{right:10px}
  .capsule-btn{width:46px; height:46px}
}