:root{
  --bg:#0c111c;
  --bg-elev:#121828;
  --line:rgba(148,163,184,.18);
  --ink:#e2e8f0;
  --ink-dim:#94a3b8;
  --accent:#22d3ee;
  --accent-2:#34d399;
  --gold:#fbbf24;
  --serif:'Source Serif 4',Georgia,serif;
  --sans:'Inter',-apple-system,'Segoe UI',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;background:rgba(12,17,28,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);z-index:50}
.site-header .wrap{display:flex;align-items:center;gap:32px;padding:18px 24px}
.brand{display:flex;align-items:center;text-decoration:none;line-height:0}
.brand-logo{height:42px;width:auto;display:block;filter:drop-shadow(0 2px 8px rgba(34,211,238,.2))}
.site-nav{display:flex;gap:20px;flex:1}
.site-nav a{color:var(--ink-dim);text-decoration:none;font-size:.92rem;font-weight:500;transition:color .15s}
.site-nav a:hover{color:var(--accent)}
.lang-switch{color:var(--ink-dim);text-decoration:none;font-size:.85rem;padding:6px 12px;border:1px solid var(--line);border-radius:8px}
.lang-switch:hover{border-color:var(--accent);color:var(--accent)}

/* Hero */
.hero{padding:80px 0 60px;background:radial-gradient(ellipse at top,rgba(34,211,238,.08),transparent 60%)}
.eyebrow{color:var(--accent);font-size:.78rem;font-weight:600;letter-spacing:2px;text-transform:uppercase;margin-bottom:16px}
.hero-h1{font-family:var(--serif);font-size:clamp(2rem,5vw,3.4rem);font-weight:700;line-height:1.15;letter-spacing:-.02em;margin-bottom:18px}
.hero-h1 .accent{color:var(--accent)}
.hero-sub{font-size:1.1rem;color:var(--ink-dim);max-width:680px;margin-bottom:32px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:600;text-decoration:none;font-size:.95rem;transition:transform .15s,background .15s}
.btn-primary{background:var(--accent);color:#022;}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{border:1px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* Section */
.section{padding:60px 0}
.section-h2{font-family:var(--serif);font-size:1.9rem;font-weight:700;margin-bottom:8px;letter-spacing:-.01em}
.section-sub{color:var(--ink-dim);margin-bottom:28px}
.page-h1{font-family:var(--serif);font-size:clamp(1.8rem,4vw,2.6rem);font-weight:700;line-height:1.2;letter-spacing:-.02em;padding:40px 0 24px}

/* Pillar grid */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}
.pcard{background:var(--bg-elev);border:1px solid var(--line);border-radius:12px;padding:22px;text-decoration:none;color:var(--ink);transition:transform .15s,border-color .15s;display:flex;flex-direction:column;gap:10px;min-height:140px}
.pcard:hover{border-color:var(--accent);transform:translateY(-2px)}
.pcard-kw{color:var(--accent);font-size:.75rem;letter-spacing:1.5px;text-transform:uppercase;font-weight:600}
.pcard-title{font-family:var(--serif);font-size:1.15rem;font-weight:600;line-height:1.35;flex:1}
.pcard-arrow{color:var(--ink-dim);text-align:right;font-size:1.1rem}

/* Cluster cards */
.ccard{background:var(--bg-elev);border:1px solid var(--line);border-radius:12px;padding:20px;text-decoration:none;color:var(--ink);display:block}
.ccard:hover{border-color:var(--accent-2)}
.ccard-title{font-weight:600;margin-bottom:6px;line-height:1.4}
.ccard-ex{color:var(--ink-dim);font-size:.9rem;margin-bottom:10px}
.ccard-date{color:var(--ink-dim);font-size:.78rem}

/* Post list */
.post-list{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.post-row{display:block;padding:18px 20px;background:var(--bg);text-decoration:none;color:var(--ink);transition:background .15s}
.post-row:hover{background:var(--bg-elev)}
.post-date{color:var(--ink-dim);font-size:.78rem;margin-bottom:4px}
.post-title{font-weight:600;font-size:1.02rem;margin-bottom:4px}
.post-ex{color:var(--ink-dim);font-size:.9rem}

/* Article prose */
.article{padding:20px 0 60px;max-width:760px}
.pillar-article{padding:0 0 40px;max-width:780px}
.pillar-kw{color:var(--accent);font-size:.85rem;letter-spacing:1px;text-transform:uppercase;margin-bottom:20px}
.article-meta{color:var(--ink-dim);font-size:.88rem;margin-bottom:32px}
.meta-sep{margin:0 8px}
.breadcrumb{color:var(--ink-dim);font-size:.88rem;margin-bottom:14px}
.breadcrumb a{color:var(--ink-dim);text-decoration:none}
.breadcrumb a:hover{color:var(--accent)}

.prose{font-family:var(--serif);font-size:1.08rem;line-height:1.78}
.prose h2{font-size:1.7rem;font-weight:700;margin:48px 0 16px;letter-spacing:-.01em}
.prose h3{font-size:1.3rem;font-weight:700;margin:32px 0 12px}
.prose p{margin-bottom:1.2em}
.prose ul,.prose ol{margin:0 0 1.2em 1.4em}
.prose li{margin-bottom:.4em}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose img{max-width:100%;height:auto;border-radius:10px;margin:24px 0}
.prose blockquote{border-left:3px solid var(--accent);padding:6px 0 6px 18px;margin:20px 0;color:var(--ink-dim);font-style:italic}
.prose table{width:100%;border-collapse:collapse;margin:24px 0;font-family:var(--sans);font-size:.95rem}
.prose th,.prose td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.prose th{background:var(--bg-elev);font-weight:600}

/* Search */
.search-form{display:flex;gap:10px;margin:30px 0;padding-top:30px}
.search-form input[type=search]{flex:1;padding:12px 16px;background:var(--bg-elev);border:1px solid var(--line);border-radius:10px;color:var(--ink);font-size:1rem}
.search-form button{padding:12px 22px;background:var(--accent);color:#022;border:none;border-radius:10px;font-weight:600;cursor:pointer}

/* Footer */
.site-footer{margin-top:80px;border-top:1px solid var(--line);background:#080c14}
.site-footer .wrap{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;padding:50px 24px 30px}
.foot-brand{font-family:var(--serif);font-size:1.3rem;font-weight:700;margin-bottom:8px}
.foot-tag{color:var(--ink-dim);font-size:.92rem}
.foot-title{font-weight:600;margin-bottom:14px;font-size:.85rem;letter-spacing:1px;text-transform:uppercase;color:var(--ink-dim)}
.site-footer a{display:block;color:var(--ink);text-decoration:none;font-size:.92rem;padding:4px 0}
.site-footer a:hover{color:var(--accent)}
.foot-bottom{border-top:1px solid var(--line);padding:18px 24px;text-align:center;color:var(--ink-dim);font-size:.82rem}

@media (max-width:720px){
  .site-header .wrap{flex-wrap:wrap;gap:16px;padding:14px 18px}
  .site-nav{order:3;width:100%;overflow-x:auto;padding-bottom:4px}
  .site-footer .wrap{grid-template-columns:1fr 1fr}
}