/* iLang Blog — Dark theme matching ilang.ai + designer mockup */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0e17;
  --bg-2:#0d1117;
  --fg:#e2e8f0;
  --fg-strong:#f1f5f9;
  --accent:#00d4aa;
  --accent-dim:rgba(0,212,170,.12);
  --accent-line:rgba(0,212,170,.28);
  --accent2:#7c3aed;
  --accent2-dim:rgba(124,58,237,.14);
  --gold:#d4a85a;
  --muted:#64748b;
  --muted-2:#94a3b8;
  --card-bg:#111827;
  --card-line:#1f2937;
  --code-bg:#131c2b;
  --code-line:#243245;
  --hairline:#1a2232;
  --sans:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --serif:'Source Serif 4',Georgia,'Songti SC',serif;
  --mono:'JetBrains Mono','SF Mono',Consolas,monospace;
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:#05070c;color:var(--fg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--fg-strong)}

/* Nav */
.bnav{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 28px;border-bottom:1px solid var(--hairline);
  background:rgba(10,14,23,.85);backdrop-filter:blur(12px);
  position:sticky;top:0;z-index:100;
}
.bnav .brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--fg-strong);font-size:1.02rem;text-decoration:none}
.bnav .brand .logo{
  width:26px;height:26px;border-radius:7px;
  background:linear-gradient(135deg,var(--accent),#2ad29c);
  display:grid;place-items:center;color:#04130d;font-weight:800;font-size:14px;
}
.bnav .links{display:flex;gap:6px;align-items:center;font-size:.88rem}
.bnav .links a{color:var(--muted-2);padding:6px 12px;border-radius:7px;transition:all .15s}
.bnav .links a:hover{color:var(--fg-strong);background:rgba(255,255,255,.04)}
.bnav .links a.cur{color:var(--accent);background:var(--accent-dim)}

/* Blog wrapper */
.b-wrap{max-width:1080px;margin:0 auto;padding:0 28px}

/* Hero header */
.b-head{padding:56px 0 36px;border-bottom:1px solid var(--hairline)}
.b-eyebrow{font-family:var(--mono);font-size:.78rem;color:var(--accent);letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px}
.b-head h1{font-family:var(--serif);font-size:2.8rem;line-height:1.08;font-weight:600;letter-spacing:-.02em;color:var(--fg-strong);margin-bottom:14px}
.b-head p{color:var(--muted-2);font-size:1.04rem;max-width:560px}

/* Featured card */
.featured{
  display:grid;grid-template-columns:1.1fr .9fr;gap:0;
  margin:40px 0;border:1px solid var(--card-line);border-radius:16px;overflow:hidden;
  background:var(--card-bg);
}
.featured .f-text{padding:40px;display:flex;flex-direction:column;justify-content:center}
.featured .ftag{
  display:inline-flex;align-items:center;gap:7px;align-self:flex-start;
  font-family:var(--mono);font-size:.72rem;color:var(--gold);letter-spacing:.1em;text-transform:uppercase;
  border:1px solid rgba(212,168,90,.3);background:rgba(212,168,90,.08);padding:4px 11px;border-radius:999px;margin-bottom:20px;
}
.featured h2{font-family:var(--serif);font-size:2.1rem;line-height:1.15;font-weight:600;letter-spacing:-.01em;color:var(--fg-strong);margin-bottom:18px}
.featured .quote{
  font-family:var(--serif);font-style:italic;font-size:1.1rem;line-height:1.5;
  color:var(--fg);border-left:2px solid var(--accent);padding-left:18px;margin-bottom:22px;
}
.featured .meta{display:flex;align-items:center;gap:16px;font-size:.82rem;color:var(--muted);font-family:var(--mono)}
.featured .meta .date{color:var(--fg)}
.featured .read-btn{
  margin-top:24px;align-self:flex-start;display:inline-flex;align-items:center;gap:8px;
  background:var(--accent);color:#04130d;font-weight:700;padding:11px 22px;border-radius:9px;font-size:.92rem;
  transition:opacity .15s;
}
.featured .read-btn:hover{opacity:.85;color:#04130d}
.featured .visual{
  position:relative;
  background:radial-gradient(circle at 70% 30%,rgba(0,212,170,.18),transparent 55%),radial-gradient(circle at 30% 80%,rgba(124,58,237,.2),transparent 55%),#0b1018;
  border-left:1px solid var(--card-line);overflow:hidden;min-height:320px;
}
.featured .visual svg{position:absolute;inset:0;width:100%;height:100%}

/* Coming soon */
.sec-label{font-family:var(--mono);font-size:.78rem;color:var(--muted-2);letter-spacing:.12em;text-transform:uppercase;margin:48px 0 18px;display:flex;align-items:center;gap:12px}
.sec-label::after{content:"";flex:1;height:1px;background:var(--hairline)}
.upcoming{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.up-card{border:1px dashed var(--card-line);border-radius:13px;padding:22px;background:rgba(255,255,255,.012);opacity:.78}
.up-card .badge{font-family:var(--mono);font-size:.68rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px;display:inline-block;border:1px solid var(--hairline);padding:3px 8px;border-radius:5px}
.up-card h3{font-family:var(--serif);font-size:1.12rem;font-weight:600;color:var(--muted-2);line-height:1.3}

/* Newsletter */
.news{
  margin:48px 0;border:1px solid var(--accent-line);border-radius:16px;
  background:linear-gradient(135deg,var(--accent-dim),transparent 60%),var(--card-bg);
  padding:36px 40px;display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap;
}
.news h3{font-family:var(--serif);font-size:1.4rem;font-weight:600;color:var(--fg-strong);margin-bottom:6px}
.news p{color:var(--muted-2);font-size:.92rem}
.news .form{display:flex;gap:10px}
.news input{background:#05070c;border:1px solid var(--card-line);border-radius:9px;padding:11px 16px;color:var(--fg);font-size:.92rem;min-width:220px;font-family:var(--sans)}
.news input::placeholder{color:var(--muted)}
.news button{background:var(--accent);color:#04130d;font-weight:700;border:none;border-radius:9px;padding:11px 22px;font-size:.92rem;cursor:pointer}

/* Blog footer */
.b-foot{border-top:1px solid var(--hairline);padding:28px 0 40px;margin-top:24px;display:flex;justify-content:space-between;color:var(--muted);font-size:.82rem;font-family:var(--mono)}

/* Post list (non-featured) */
.posts-list{margin-top:40px}
.post-card{padding:24px 0;border-bottom:1px solid var(--hairline)}
.post-card:last-child{border-bottom:none}
.post-card h2 a{color:var(--fg-strong);font-family:var(--serif);font-size:1.3rem;font-weight:600;transition:color .15s}
.post-card h2 a:hover{color:var(--accent)}
.post-card .post-excerpt{color:var(--muted-2);font-size:.94rem;margin-top:6px}
.post-card .post-meta{font-family:var(--mono);font-size:.78rem;color:var(--muted);margin-bottom:6px}

/* Tag links */
.tag-link,.tag-link-sm{
  background:var(--accent-dim);color:var(--accent);
  padding:3px 10px;border-radius:5px;font-size:.75rem;font-weight:500;
  font-family:var(--mono);text-decoration:none;transition:all .15s;
}
.tag-link:hover,.tag-link-sm:hover{background:var(--accent);color:#04130d}

/* Tags page */
.tags-page{max-width:720px;margin:0 auto;padding:60px 28px 80px}
.tags-page h1{font-family:var(--serif);font-size:2rem;font-weight:600;color:var(--fg-strong);margin-bottom:8px}
.tags-intro{color:var(--muted-2);font-size:.94rem;margin-bottom:32px}
.tags-cloud{display:flex;flex-wrap:wrap;gap:12px}
.tag-pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border:1px solid var(--card-line);border-radius:8px;
  text-decoration:none;color:var(--fg);font-size:.92rem;font-weight:500;
  transition:all .15s;
}
.tag-pill:hover{border-color:var(--accent);background:var(--accent-dim);color:var(--fg-strong)}
.tag-count{background:rgba(255,255,255,.06);color:var(--muted);font-size:.75rem;padding:2px 8px;border-radius:10px;font-weight:600}

/* Tag term page */
.tag-term-page{max-width:960px;margin:0 auto;padding:0 28px 80px}
.tag-term-header{padding:60px 0 32px;border-bottom:1px solid var(--hairline);margin-bottom:0}
.tag-term-header h1{font-family:var(--serif);font-size:1.8rem;font-weight:600;margin-top:12px;color:var(--fg-strong)}
.tag-term-count{color:var(--muted);font-size:.82rem;margin-top:4px}
.back-link{color:var(--accent);font-size:.86rem;text-decoration:none;font-weight:500;font-family:var(--mono)}
.back-link:hover{text-decoration:underline}

/* ===== ARTICLE PAGE ===== */
.progress-bar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2));width:0;z-index:200;transition:width .1s}
.art-layout{display:grid;grid-template-columns:1fr 200px;gap:48px;max-width:860px;margin:0 auto;padding:0 28px}
.art-main{padding:48px 0;min-width:0}
.art-eyebrow{font-family:var(--mono);font-size:.78rem;color:var(--accent);letter-spacing:.14em;text-transform:uppercase;margin-bottom:18px}
.art-main h1{font-family:var(--serif);font-size:2.5rem;line-height:1.12;font-weight:600;letter-spacing:-.015em;color:var(--fg-strong);margin-bottom:22px}
.art-byline{display:flex;align-items:center;gap:14px;padding-bottom:24px;border-bottom:1px solid var(--hairline);margin-bottom:32px;font-size:.84rem;color:var(--muted)}
.art-byline .av{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent2),var(--accent));flex-shrink:0}
.art-byline .who{color:var(--fg);font-weight:600}
.art-byline .dot{color:var(--card-line)}
.post-tags-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}

/* Article body — serif */
.art-body{font-family:var(--serif);font-size:1.14rem;line-height:1.85;color:#cdd5e0}
.art-body .abstract{font-family:var(--mono);font-size:.82rem;line-height:1.6;color:var(--muted-2);border-left:2px solid var(--hairline);padding:12px 16px;margin-bottom:2em;background:rgba(255,255,255,.02);border-radius:0 4px 4px 0}
.art-body .abstract strong{color:var(--muted);font-weight:500}
.art-body .abstract a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent}
.art-body .abstract a:hover{border-bottom-color:var(--accent)}
.art-body p{margin-bottom:1.4em}
.art-body h2{font-family:var(--sans);font-size:1.4rem;font-weight:700;color:var(--fg-strong);margin:1.8em 0 .6em;letter-spacing:-.01em}
.art-body h3{font-family:var(--sans);font-size:1.15rem;font-weight:600;color:var(--fg-strong);margin:1.4em 0 .5em}
.art-body .lead{font-size:1.3rem;line-height:1.6;color:var(--fg)}
.art-body a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.art-body strong{font-weight:600;color:var(--fg-strong)}
.art-body blockquote{
  font-family:var(--serif);font-style:italic;font-size:1.5rem;line-height:1.4;
  color:var(--fg-strong);margin:1.4em 0;padding:8px 0 8px 26px;
  border-left:3px solid var(--accent);
}
.art-body blockquote strong{color:var(--accent);font-style:normal}
.art-body code{font-family:var(--mono);background:var(--code-bg);padding:2px 6px;border-radius:4px;font-size:.88rem;color:var(--accent)}
.art-body pre{
  background:var(--code-bg);border:1px solid var(--code-line);
  border-radius:11px;padding:20px;overflow-x:auto;margin:1.5em 0;
  font-size:.84rem;line-height:1.7;color:#cbd5e1;
}
.art-body pre code{background:none;padding:0;color:inherit;font-size:inherit}
.art-body ul,.art-body ol{margin:1em 0;padding-left:24px}
.art-body li{margin-bottom:8px;color:#cdd5e0}
.art-body img{max-width:100%;border-radius:8px;margin:1.5em 0}
.art-body hr{border:none;border-top:1px solid var(--hairline);margin:2.5em 0}

/* Sticky TOC */
.toc{position:sticky;top:80px;align-self:start;padding:48px 0}
.toc h4{font-family:var(--mono);font-size:.72rem;color:var(--muted);letter-spacing:.12em;text-transform:uppercase;margin-bottom:16px}
.toc a{display:block;color:var(--muted-2);font-size:.84rem;padding:6px 0 6px 14px;border-left:1px solid var(--hairline);transition:all .15s}
.toc a:hover{color:var(--fg)}

/* Article footer */
.art-end{max-width:860px;margin:0 auto;padding:36px 28px 56px;border-top:1px solid var(--hairline)}
.art-author{display:flex;gap:16px;align-items:center;margin-bottom:36px}
.art-author .av{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--accent2),var(--accent));flex-shrink:0}
.art-author .bio b{color:var(--fg-strong)}
.art-author .bio p{color:var(--muted-2);font-size:.88rem}

/* Related posts */
.related-posts h4{font-family:var(--mono);font-size:.78rem;color:var(--muted-2);letter-spacing:.12em;text-transform:uppercase;margin-bottom:16px}
.comments{margin-top:48px;padding-top:32px;border-top:1px solid var(--hairline)}
.comments h4{font-family:var(--mono);font-size:.78rem;color:var(--muted-2);letter-spacing:.12em;text-transform:uppercase;margin-bottom:20px}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.rel-card{border:1px solid var(--card-line);border-radius:11px;padding:20px;background:var(--card-bg);text-decoration:none;display:block;transition:border-color .15s}
.rel-card:hover{border-color:var(--accent)}
.rel-card .k{font-family:var(--mono);font-size:.7rem;color:var(--accent);letter-spacing:.08em;margin-bottom:8px}
.rel-card h5{font-family:var(--serif);font-size:1.05rem;color:var(--fg-strong);font-weight:600;line-height:1.3}

.post-nav-bottom{display:flex;justify-content:space-between;margin-top:24px}

/* Home tags */
.home-tags{margin-top:48px;padding-top:32px;border-top:1px solid var(--hairline)}
.home-tags h3{font-family:var(--mono);font-size:.78rem;color:var(--muted-2);letter-spacing:.12em;text-transform:uppercase;margin-bottom:16px}
.tags-row{display:flex;flex-wrap:wrap;gap:8px}
.tag-count-sm{opacity:.6;font-size:.68rem}

/* Responsive */
@media(max-width:820px){
  .b-wrap{padding:0 16px}
  .featured{grid-template-columns:1fr}
  .featured .f-text{padding:24px}
  .featured .visual{min-height:180px;border-left:none;border-top:1px solid var(--card-line)}
  .featured h2{font-size:1.6rem}
  .featured .quote{font-size:1rem}
  .featured .meta{flex-wrap:wrap;gap:8px}
  .upcoming{grid-template-columns:1fr}
  .up-card{padding:16px}
  .news{flex-direction:column;align-items:flex-start;padding:24px 20px}
  .news input{min-width:180px;width:100%}
  .news .form{width:100%;flex-direction:column}
  .news button{width:100%}
  .art-layout{grid-template-columns:1fr;padding:0 16px}
  .toc{display:none}
  .art-main h1{font-size:1.6rem}
  .art-byline{flex-wrap:wrap;gap:8px}
  .art-body blockquote{font-size:1.2rem;padding-left:16px}
  .art-end{padding:24px 16px 40px}
  .related-grid{grid-template-columns:1fr}
  .b-head{padding:36px 0 24px}
  .b-head h1{font-size:2rem}
  .b-head p{font-size:.94rem}
  .bnav{padding:12px 16px}
  .bnav .links{gap:0}
  .bnav .links a{padding:6px 6px;font-size:.78rem}
  .b-foot{flex-direction:column;gap:8px;text-align:center}
  .post-nav-bottom{flex-direction:column;gap:8px}
}
@media(max-width:480px){
  .bnav .brand{font-size:.9rem}
  .bnav .links a{padding:4px 4px;font-size:.72rem}
  .b-head h1{font-size:1.6rem}
  .featured h2{font-size:1.4rem}
  .art-main h1{font-size:1.4rem}
  .sec-label{font-size:.7rem}
}