/* ============================================================
   CogenPro BLOG — light theme (V15)
   Inherits brand tokens from cogenpro.css (loaded first),
   overrides to a white/light reading surface for blog pages only.
   ============================================================ */

:root{
  --blog-bg:#ffffff;
  --blog-surface:#f6f8fb;
  --blog-text:#12203d;        /* deep navy for body text */
  --blog-heading:#070e1c;     /* near-black navy for headings */
  --blog-muted:#5a6b86;
  --blog-muted2:#8494ac;
  --blog-border:#e4e9f1;
  --blog-border-strong:#d3dbe8;
}

/* ---- page shell overrides ---- */
body.blog{background:var(--blog-bg);color:var(--blog-text)}
body.blog nav:not(.article-breadcrumb){
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--blog-border);
}
body.blog .nav-link{color:var(--blog-muted)}
body.blog .nav-link:hover{color:var(--blue)}
body.blog .nav-logo-img{height:54px;width:auto}
body.blog .lang-btn{color:var(--blog-muted);border-color:var(--blog-border-strong)}
body.blog .lang-btn.active{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---- blog hub ---- */
.blog-hub-wrap{max-width:1080px;margin:0 auto;padding:7.5rem 1.5rem 4rem}
.blog-hub-head{text-align:center;max-width:720px;margin:0 auto 3.5rem}
.blog-kicker{font-family:'Archivo',sans-serif;font-weight:600;font-size:0.72rem;letter-spacing:0.25em;text-transform:uppercase;color:var(--gold)}
.blog-hub-title{font-family:'Archivo',sans-serif;font-weight:800;font-size:2.6rem;line-height:1.1;letter-spacing:-0.02em;color:var(--blog-heading);margin:0.9rem 0 1rem}
.blog-hub-intro{font-size:1.02rem;line-height:1.7;color:var(--blog-muted)}

.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.8rem}
.blog-card{display:flex;flex-direction:column;background:var(--blog-bg);border:1px solid var(--blog-border);border-radius:12px;overflow:hidden;transition:transform 0.2s,box-shadow 0.2s,border-color 0.2s;text-decoration:none}
.blog-card:hover{transform:translateY(-4px);box-shadow:0 14px 40px rgba(12,24,48,0.10);border-color:var(--blog-border-strong)}
.blog-card-img{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--blog-surface);display:block}
.blog-card-slot{width:100%;aspect-ratio:16/9;background:linear-gradient(135deg,#eef2f8,#e2e8f2);display:flex;align-items:center;justify-content:center;text-align:center;color:var(--blog-muted2);font-family:'Archivo',sans-serif;font-size:0.72rem;letter-spacing:0.1em;text-transform:uppercase;padding:1rem}
.blog-card-body{padding:1.5rem 1.5rem 1.7rem;display:flex;flex-direction:column;flex:1}
.blog-card-cluster{font-family:'Archivo',sans-serif;font-weight:600;font-size:0.66rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--gold);margin-bottom:0.7rem}
.blog-card-title{font-family:'Archivo',sans-serif;font-weight:700;font-size:1.16rem;line-height:1.3;letter-spacing:-0.01em;color:var(--blog-heading);margin-bottom:0.6rem}
.blog-card-excerpt{font-size:0.9rem;line-height:1.6;color:var(--blog-muted);flex:1}
.blog-card-meta{margin-top:1.2rem;display:flex;align-items:center;gap:0.6rem;font-family:'Archivo',sans-serif;font-size:0.74rem;color:var(--blog-muted2)}
.blog-card-arrow{margin-left:auto;color:var(--blue);font-weight:700}

/* ---- article ---- */
.article-wrap{max-width:900px;margin:0 auto;padding:7.5rem 1.5rem 2rem}
.article-breadcrumb{display:flex;flex-wrap:wrap;gap:0.45rem;align-items:center;font-family:'Archivo',sans-serif;font-size:0.74rem;color:var(--blog-muted2);margin-bottom:1.8rem}
.article-breadcrumb a{color:var(--blog-muted);text-decoration:none}
.article-breadcrumb a:hover{color:var(--blue)}
.article-cluster{font-family:'Archivo',sans-serif;font-weight:600;font-size:0.7rem;letter-spacing:0.16em;text-transform:uppercase;color:var(--gold)}
.article-title{font-family:'Archivo',sans-serif;font-weight:800;font-size:2.3rem;line-height:1.14;letter-spacing:-0.02em;color:var(--blog-heading);margin:0.8rem 0 1rem}
.article-meta{display:flex;align-items:center;gap:0.9rem;font-family:'Archivo',sans-serif;font-size:0.78rem;color:var(--blog-muted2);padding-bottom:1.8rem;border-bottom:1px solid var(--blog-border);margin-bottom:2rem}
.article-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--blog-muted2)}

.article-hero{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;margin:0 0 2.4rem;background:var(--blog-surface)}
.article-img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;margin:1.8rem 0;background:var(--blog-surface)}
.img-slot{width:100%;aspect-ratio:16/9;border-radius:12px;background:linear-gradient(135deg,#eef2f8,#e2e8f2);border:1px dashed var(--blog-border-strong);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:var(--blog-muted2);font-family:'Archivo',sans-serif;padding:1.5rem;margin:0 0 2.4rem}
.img-slot .slot-label{font-size:0.78rem;letter-spacing:0.1em;text-transform:uppercase;font-weight:700;margin-bottom:0.4rem}
.img-slot .slot-hint{font-size:0.76rem;color:var(--blog-muted2);font-family:'DM Sans',sans-serif;max-width:420px;line-height:1.5}

.article-body{font-size:1.03rem;line-height:1.78;color:var(--blog-text)}
.article-body p{margin-bottom:1.3rem}
.article-body h2{font-family:'Archivo',sans-serif;font-weight:800;font-size:1.5rem;line-height:1.2;letter-spacing:-0.01em;color:var(--blog-heading);margin:2.6rem 0 1rem}
.article-body h3{font-family:'Archivo',sans-serif;font-weight:700;font-size:1.15rem;color:var(--blog-heading);margin:1.8rem 0 0.7rem}
.article-body ul,.article-body ol{margin:0 0 1.3rem;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:0.7rem}
.article-body ul li{position:relative;padding-left:1.4rem;line-height:1.7}
.article-body ul li::before{content:'';position:absolute;left:0;top:0.62em;width:7px;height:7px;border-radius:50%;background:var(--gold)}
.article-body ol{counter-reset:step}
.article-body ol li{position:relative;padding-left:2rem;line-height:1.7;counter-increment:step}
.article-body ol li::before{content:counter(step);position:absolute;left:0;top:0.05em;width:1.4rem;height:1.4rem;background:var(--blue);color:#fff;border-radius:50%;font-family:'Archivo',sans-serif;font-weight:700;font-size:0.74rem;display:flex;align-items:center;justify-content:center}
.article-body strong{color:var(--blog-heading);font-weight:600}
.article-body a{color:var(--blue);text-decoration:underline;text-underline-offset:2px}

/* inline pillar link callout */
.pillar-callout{background:var(--blog-surface);border-left:3px solid var(--gold);border-radius:0 8px 8px 0;padding:1.1rem 1.3rem;margin:1.8rem 0;font-size:0.96rem;line-height:1.6}
.pillar-callout a{font-weight:600}

/* video summary (lazy-loaded YouTube facade) */
.article-video{margin:2.2rem auto 2.6rem;max-width:360px}
.video-embed{position:relative;width:100%;border-radius:14px;overflow:hidden;background:#070e1c;box-shadow:0 10px 34px rgba(12,24,48,0.16)}
.video-embed-vertical{aspect-ratio:9/16}
.video-embed-wide{aspect-ratio:16/9}
.video-facade{position:absolute;inset:0;width:100%;height:100%;border:0;padding:0;margin:0;cursor:pointer;background:#070e1c;display:block}
.video-facade img{width:100%;height:100%;object-fit:cover;display:block;opacity:0.82;transition:opacity 0.2s}
.video-facade:hover img{opacity:1}
.video-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:66px;height:66px;border-radius:50%;background:var(--gold);color:#1a1500;display:flex;align-items:center;justify-content:center;font-size:1.5rem;padding-left:5px;box-shadow:0 6px 22px rgba(0,0,0,0.45);transition:transform 0.15s,background 0.2s}
.video-facade:hover .video-play{transform:translate(-50%,-50%) scale(1.06);background:var(--gold-bright)}
.video-iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.article-video figcaption{margin-top:0.7rem;font-size:0.8rem;color:var(--blog-muted2);font-style:italic;text-align:center}

/* figure (real drawing) */
.article-figure{margin:1.8rem 0}
.article-figure img{width:100%;border-radius:10px;border:1px solid var(--blog-border);display:block;background:#fff}
.article-figure figcaption{margin-top:0.7rem;font-size:0.8rem;color:var(--blog-muted2);font-style:italic;text-align:center}

/* key-facts box */
.key-box{background:var(--blog-surface);border:1px solid var(--blog-border);border-radius:12px;padding:1.5rem 1.6rem;margin:2rem 0}
.key-box h3{font-family:'Archivo',sans-serif;font-weight:700;font-size:0.82rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--gold);margin:0 0 0.9rem}
.key-box ul{margin:0;gap:0.55rem}

/* end CTA */
.article-cta{margin:3rem 0 1rem;background:linear-gradient(135deg,#070e1c,#13234a);border-radius:14px;padding:2.2rem 2rem;text-align:center;color:#fff}
.article-cta h3{font-family:'Archivo',sans-serif;font-weight:800;font-size:1.4rem;letter-spacing:-0.01em;margin:0 0 0.7rem;color:#fff}
.article-cta p{color:#b8c4da;font-size:0.96rem;line-height:1.6;max-width:520px;margin:0 auto 1.5rem}
.article-cta .cta-btn{display:inline-flex;align-items:center;gap:0.7rem;background:var(--gold);color:#1a1500;font-family:'Archivo',sans-serif;font-weight:700;font-size:0.9rem;padding:0.85rem 1.7rem;border-radius:8px;text-decoration:none;transition:background 0.2s}
.article-cta .cta-btn:hover{background:var(--gold-bright)}

/* related */
.article-related{margin:3rem 0 1rem;border-top:1px solid var(--blog-border);padding-top:2rem}
.article-related h3{font-family:'Archivo',sans-serif;font-weight:700;font-size:0.82rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--blog-muted);margin:0 0 1.2rem}
.related-links{display:flex;flex-direction:column;gap:0.8rem}
.related-links a{display:flex;align-items:center;gap:0.7rem;color:var(--blog-heading);text-decoration:none;font-family:'Archivo',sans-serif;font-weight:600;font-size:0.95rem;padding:0.5rem 0}
.related-links a:hover{color:var(--blue)}
.related-links a .rl-arrow{color:var(--gold);font-weight:700}

/* footer light on blog */
body.blog footer{background:var(--blog-surface);border-top:1px solid var(--blog-border);color:var(--blog-muted)}
body.blog .footer-brand{color:var(--blog-heading)}
body.blog .footer-col h5{color:var(--blog-heading)}
body.blog .footer-col a{color:var(--blog-muted)}
body.blog .footer-col a:hover{color:var(--blue)}
body.blog .footer-brand-desc{color:var(--blog-muted)}
body.blog .footer-bottom{color:var(--blog-muted2);border-top-color:var(--blog-border)}
body.blog .footer-brand-img{height:54px;width:auto}

@media(max-width:640px){
  .blog-hub-title{font-size:2rem}
  .article-title{font-size:1.8rem}
  .article-body{font-size:1rem}
  .blog-hub-wrap,.article-wrap{padding-top:6rem}
}

/* reviewer credential + disclaimer box (V16) */
.review-box{background:#fbfaf5;border:1px solid var(--gold-light);border-left:3px solid var(--gold)}
.review-box strong{color:var(--blog-heading);font-weight:600}