:root{
  --black:#020305; --panel:rgba(11,15,23,.68); --panel-strong:rgba(11,15,23,.9);
  --primary:#00f0ff; --primary-dim:#00a3b3; --primary-glow:rgba(0,240,255,.22);
  --silver:#9aa6b6; --silver-light:#d8e2f0; --white:#f5f8ff; --border:rgba(0,240,255,.14);
  --radius:14px; --max-width:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--black);color:var(--silver-light);
  font-family:'Chiron Hei HK','PingFang SC','Microsoft YaHei',sans-serif;line-height:1.8;overflow-x:hidden}
body::after{content:'';position:fixed;inset:0;
  background:repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,240,255,.015) 3px);
  pointer-events:none;z-index:-1}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--white)}
.site-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;
  padding:1rem 4vw;background:rgba(2,3,5,.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.05)}
.logo{font-family:'Orbitron',sans-serif;font-weight:900;font-size:1.25rem;color:var(--white);letter-spacing:2px}
.logo span{color:var(--primary)}
.nav{display:flex;align-items:center;gap:1.6rem;flex-wrap:wrap}
.nav a{color:var(--silver);font-size:.9rem;position:relative}
.nav a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:1px;background:var(--primary);transition:width .25s}
.nav a:hover{color:var(--primary)} .nav a:hover::after{width:100%}
.nav a.active{color:var(--primary)} .nav a.active::after{width:100%}
.nav .btn{border:1px solid var(--primary);color:var(--primary);padding:.4rem .95rem;border-radius:4px}
.nav .btn::after{display:none}
main{max-width:var(--max-width);margin:0 auto;padding:2.5rem 4vw 4rem}
.breadcrumb{font-size:.85rem;color:var(--silver);margin-bottom:1.6rem;display:flex;gap:.5rem;flex-wrap:wrap}
.breadcrumb span{opacity:.5}
.breadcrumb .b-cat{color:var(--silver)}
.eyebrow{display:inline-block;font-family:'Orbitron',sans-serif;color:var(--primary);font-size:.72rem;
  letter-spacing:.12em;text-transform:uppercase;margin-bottom:.8rem;border:1px solid var(--border);
  padding:.25rem .6rem;border-radius:4px}
h1,h2,h3,h4{color:var(--white);line-height:1.3}
.article{background:var(--panel);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);
  padding:2.4rem clamp(1.2rem,4vw,3rem);backdrop-filter:blur(8px);max-width:900px;margin:0 auto}
.article-head h1{font-size:clamp(1.5rem,3.6vw,2.4rem);margin:.2rem 0 .9rem;letter-spacing:-.01em}
.article-meta{color:var(--silver);font-size:.85rem;padding-bottom:1.4rem;border-bottom:1px solid rgba(255,255,255,.06)}
.article-body{font-size:1.03rem}
.article-body p{margin:0 0 1.2rem}
.article-body strong{color:var(--white);font-weight:700}
.article-body h3{margin:2.4rem 0 .9rem;font-size:1.22rem;border-left:3px solid var(--primary);
  padding-left:.85rem;color:var(--white)}
.article-body h4{margin:1.8rem 0 .7rem;font-size:1.08rem}
.article-body ul,.article-body ol{padding-left:1.4rem;margin:0 0 1.2rem}
.article-body li{margin:.35rem 0}
.article-body hr{border:none;border-top:1px solid rgba(255,255,255,.08);margin:2rem 0}
.article-body blockquote{margin:1.4rem 0;padding:.9rem 1.2rem;border-left:3px solid var(--primary-dim);
  background:rgba(0,240,255,.05);border-radius:0 8px 8px 0;color:var(--silver)}
.article-body pre{background:#05070a;border:1px solid rgba(255,255,255,.07);border-radius:8px;
  padding:1rem 1.2rem;overflow-x:auto;font-size:.9rem;line-height:1.6;margin:0 0 1.2rem}
.article-body code{font-family:Consolas,'Courier New',monospace;color:var(--primary)}
.article-body pre code{color:var(--silver-light)}
.table-wrap{overflow-x:auto;margin:0 0 1.4rem}
.article-body table{border-collapse:collapse;width:100%;font-size:.94rem;background:rgba(5,7,10,.5)}
.article-body th,.article-body td{border:1px solid rgba(255,255,255,.08);padding:.6rem .85rem;text-align:left}
.article-body th{background:rgba(0,240,255,.08);color:var(--primary);font-weight:700;white-space:nowrap}
.article-body tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.pn-wrap{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-top:2.2rem;padding-top:1.4rem;
  border-top:1px solid rgba(255,255,255,.06)}
.pn{font-size:.9rem;color:var(--silver);max-width:46%}
.pn:hover{color:var(--primary)}
.related{max-width:900px;margin:2rem auto 0;background:var(--panel);border:1px solid rgba(255,255,255,.06);
  border-radius:var(--radius);padding:1.6rem 2rem}
.related h2{font-size:1.05rem;margin:0 0 1rem;color:var(--primary)}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:.55rem 1.5rem}
.related li{font-size:.92rem;color:var(--silver-light)}
.cta-box{margin:2.5rem auto 0;max-width:900px;padding:clamp(2rem,4vw,3rem);border-radius:20px;
  border:1px solid var(--border);background:radial-gradient(circle at 50% 0%,rgba(0,240,255,.12),transparent 55%),var(--panel-strong);
  text-align:center;backdrop-filter:blur(14px)}
.cta-box h2{font-size:clamp(1.3rem,2.6vw,1.9rem);margin:0 0 .8rem}
.cta-box p{color:var(--silver);max-width:560px;margin:0 auto 1.4rem;font-size:.98rem}
.btn-primary{display:inline-block;background:linear-gradient(90deg,var(--primary),#00c2ff);color:#000;font-weight:700;
  padding:.85rem 1.7rem;border-radius:6px;box-shadow:0 0 28px var(--primary-glow);transition:transform .2s,box-shadow .2s}
.btn-primary:hover{color:#000;transform:translateY(-2px);box-shadow:0 0 40px rgba(0,240,255,.35)}
.contact-row{margin-top:1.1rem;color:var(--silver);font-size:.9rem}
.contact-row strong{color:var(--primary);font-family:'Orbitron',sans-serif}
footer{padding:2.5rem 4vw;border-top:1px solid rgba(255,255,255,.06);text-align:center;color:var(--silver);font-size:.85rem}
footer .logo{display:inline-block;margin-bottom:.6rem}
.f-sub{opacity:.65;margin-top:.5rem}

/* ---- 文章中心页 ---- */
.hub-head{max-width:900px;margin:0 auto 2rem;text-align:center}
.hub-head h1{font-size:clamp(1.7rem,4vw,2.6rem);margin:.2rem 0 1rem}
.hub-head p{color:var(--silver);max-width:700px;margin:0 auto}
.hub-nav{display:flex;justify-content:center;flex-wrap:wrap;gap:.6rem;margin:0 auto 2.5rem;max-width:900px}
.hub-nav a{border:1px solid var(--border);color:var(--primary);padding:.35rem .85rem;border-radius:999px;font-size:.85rem}
.hub-nav a:hover{background:rgba(0,240,255,.08);color:var(--primary)}
.cat-wrap{display:grid;grid-template-columns:1fr;gap:2rem}
.cat-section{background:var(--panel);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);
  padding:1.8rem clamp(1.2rem,3vw,2.2rem);backdrop-filter:blur(8px)}
.cat-section h2{display:flex;align-items:center;gap:.8rem;font-size:1.2rem;margin:0 0 1.1rem}
.cat-num{font-family:'Orbitron',sans-serif;color:var(--primary);font-size:1.5rem;opacity:.9}
.cat-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:.45rem 1.6rem}
.cat-list li{font-size:.94rem}
.cat-list a{color:var(--silver-light)}
.cat-list a:hover{color:var(--primary)}
@media(max-width:720px){
  .nav{gap:1rem}
  .related ul,.cat-list{grid-template-columns:1fr}
  .pn{max-width:100%}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}}