/* nd-blog.css — Signsutra Technical Journal & Single Article Styles. Scoped under `.nd`. */

/* ==========================================================================
   1. ARCHIVE / JOURNAL PAGE
   ========================================================================== */

/* Hero Section */
.nd .blog-hero{
  margin-top:var(--nav-h);
  padding:90px 60px 60px;
  border-bottom:1px solid var(--gray-mid);
  position:relative;
}

.nd .blog-hero h1{
  font-size:clamp(40px,6vw,76px);
  font-weight:200;
  line-height:1.06;
  letter-spacing:-.03em;
  color:var(--black);
}
.nd .blog-hero h1 em{
  font-style:normal;
  color:var(--red);
}

.nd .blog-hero .hero-sub{
  margin-top:22px;
  font-size:15px;
  font-weight:300;
  color:var(--gray-text);
  max-width:680px;
  line-height:1.75;
}

/* Technical Specification Chips Ribbon */
.nd .blog-specs-ribbon{
  margin-top:32px;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
}

.nd .blog-spec-chip{
  font-family:monospace;
  font-size:10px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  padding:6px 14px;
  border:1px solid var(--gray-mid);
  background:var(--gray-light);
  color:var(--black);
  border-radius:2px;
  transition:border-color .2s ease,color .2s ease,transform .2s ease;
}
.nd .blog-spec-chip:hover{
  border-color:var(--red);
  color:var(--red);
  transform:translateY(-1px);
}

/* Category Filter Bar */
.nd .blog-filter-wrap{
  border-bottom:1px solid var(--gray-mid);
  background:var(--gray-light);
  padding:20px 60px;
}

.nd .blog-filter-bar{
  display:flex;
  align-items:center;
  gap:10px;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  padding-bottom:2px;
}

.nd .blog-filter-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex-shrink:0;
  padding:8px 18px;
  border:1px solid var(--gray-mid);
  border-radius:2px;
  background:#fff;
  font-family:var(--font);
  font-size:11px;
  font-weight:400;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--black);
  cursor:pointer;
  transition:all .2s ease;
  text-decoration:none;
}
.nd .blog-filter-btn:hover{
  border-color:var(--red);
  color:var(--red);
}
.nd .blog-filter-btn.active{
  background:var(--black);
  border-color:var(--black);
  color:#fff;
}
.nd .blog-filter-count{
  font-size:9px;
  font-weight:500;
  opacity:.7;
  padding:1px 6px;
  background:rgba(0,0,0,.06);
  border-radius:10px;
}
.nd .blog-filter-btn.active .blog-filter-count{
  background:rgba(255,255,255,.25);
  color:#fff;
}

/* Featured / Spotlight Lead Post */
.nd .blog-featured-wrap{
  padding:60px 60px 0;
}

.nd .blog-featured-card{
  display:grid;
  grid-template-columns:1.2fr 1fr;
  border:1px solid var(--gray-mid);
  background:#fff;
  text-decoration:none;
  color:inherit;
  transition:border-color .25s ease,box-shadow .25s ease;
}
.nd .blog-featured-card:hover{
  border-color:var(--black);
  box-shadow:0 12px 36px rgba(0,0,0,.04);
}

.nd .blog-featured-thumb{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--gray-light);
}
.nd .blog-featured-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transition:transform .6s cubic-bezier(.25,1,.5,1);
}
.nd .blog-featured-card:hover .blog-featured-thumb img{
  transform:scale(1.04);
}

.nd .blog-featured-content{
  padding:48px 48px;
  display:flex;
  flex-direction:column;
  justify-content:center;
}

.nd .blog-featured-badge{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:monospace;
  font-size:10px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  margin-bottom:16px;
}
.nd .blog-featured-badge::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--red);
}

.nd .blog-featured-card h2{
  font-size:clamp(24px,2.8vw,36px);
  font-weight:300;
  line-height:1.25;
  letter-spacing:-.02em;
  color:var(--black);
  margin-bottom:18px;
  transition:color .2s ease;
}
.nd .blog-featured-card:hover h2{
  color:var(--red);
}

.nd .blog-featured-excerpt{
  font-size:15px;
  font-weight:300;
  line-height:1.75;
  color:var(--gray-text);
  margin-bottom:28px;
}

.nd .blog-featured-meta{
  margin-top:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:11px;
  font-weight:400;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gray-text);
  padding-top:20px;
  border-top:1px solid var(--gray-mid);
}

.nd .blog-featured-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--black);
  font-weight:500;
  transition:color .2s ease;
}
.nd .blog-featured-card:hover .blog-featured-link{
  color:var(--red);
}
.nd .blog-featured-link svg{
  width:14px;
  height:14px;
  stroke:currentColor;
  transition:transform .2s ease;
}
.nd .blog-featured-card:hover .blog-featured-link svg{
  transform:translateX(4px);
}

/* Standard Editorial Grid */
.nd .blog-grid-wrap{
  padding:40px 60px 80px;
}

.nd .blog-grid-label{
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--black);
  margin-bottom:24px;
  display:flex;
  align-items:center;
  gap:12px;
}
.nd .blog-grid-label::after{
  content:"";
  flex:1;
  height:1px;
  background:var(--gray-mid);
}

.nd .blog-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:32px;
}

.nd .blog-card{
  display:flex;
  flex-direction:column;
  background:#fff;
  border:1px solid var(--gray-mid);
  text-decoration:none;
  color:inherit;
  transition:border-color .25s ease,box-shadow .25s ease,transform .25s ease;
  position:relative;
}
.nd .blog-card:hover{
  border-color:var(--black);
  box-shadow:0 8px 24px rgba(0,0,0,.04);
  transform:translateY(-2px);
}

.nd .blog-card-thumb{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  background:var(--gray-light);
}
.nd .blog-card-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transition:transform .5s ease;
}
.nd .blog-card:hover .blog-card-thumb img{
  transform:scale(1.05);
}

/* Fallback Blueprint Texture for cards without image */
.nd .blog-card-thumb.is-blank{
  background:
    repeating-linear-gradient(0deg,transparent 0 23px,rgba(10,10,10,.05) 23px 24px),
    repeating-linear-gradient(90deg,transparent 0 23px,rgba(10,10,10,.05) 23px 24px),var(--gray-light);
  display:flex;
  align-items:center;
  justify-content:center;
}
.nd .blog-card-thumb.is-blank span{
  font-family:monospace;
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gray-text);
}

.nd .blog-card-body{
  padding:28px 28px 24px;
  display:flex;
  flex-direction:column;
  flex:1;
}

.nd .blog-card-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:14px;
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.nd .blog-card-cat{
  color:var(--red);
  font-weight:500;
}

.nd .blog-card-read{
  color:var(--gray-text);
  font-family:monospace;
  font-size:10px;
}

.nd .blog-card h3{
  font-size:19px;
  font-weight:300;
  line-height:1.35;
  letter-spacing:-.015em;
  margin-bottom:12px;
  color:var(--black);
  transition:color .2s ease;
}
.nd .blog-card:hover h3{
  color:var(--red);
}

.nd .blog-card-excerpt{
  font-size:13.5px;
  font-weight:300;
  line-height:1.7;
  color:var(--gray-text);
  margin-bottom:20px;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

.nd .blog-card-footer{
  margin-top:auto;
  padding-top:16px;
  border-top:1px solid var(--gray-mid);
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:11px;
  font-weight:400;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gray-text);
}

.nd .blog-card-more{
  color:var(--black);
  font-weight:500;
  display:inline-flex;
  align-items:center;
  gap:6px;
  transition:color .2s ease;
}
.nd .blog-card:hover .blog-card-more{
  color:var(--red);
}
.nd .blog-card-more svg{
  width:12px;
  height:12px;
  stroke:currentColor;
  transition:transform .2s ease;
}
.nd .blog-card:hover .blog-card-more svg{
  transform:translateX(3px);
}

/* Empty State */
.nd .blog-empty{
  text-align:center;
  padding:90px 20px;
  font-size:16px;
  font-weight:300;
  color:var(--gray-text);
}

/* Pagination */
.nd .pager{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:40px 60px 60px;
}
.nd .pager a,.nd .pager span{
  min-width:42px;
  height:42px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:0 14px;
  border:1px solid var(--gray-mid);
  font-family:var(--font);
  font-size:12px;
  font-weight:400;
  letter-spacing:.1em;
  text-decoration:none;
  color:var(--black);
  background:#fff;
  transition:all .2s ease;
}
.nd .pager a:hover{
  border-color:var(--red);
  color:var(--red);
}
.nd .pager .current{
  background:var(--black);
  border-color:var(--black);
  color:#fff;
}

/* Bottom Technical Callout */
.nd .blog-cta{
  border-top:1px solid var(--gray-mid);
  padding:70px 60px;
  background:#fafafa;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:32px;
}
.nd .blog-cta-left b{
  display:block;
  font-size:12px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--black);
  margin-bottom:8px;
}
.nd .blog-cta-left p{
  font-size:14px;
  font-weight:300;
  color:var(--gray-text);
  line-height:1.6;
  max-width:580px;
}
.nd .blog-cta-actions{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
}

/* ==========================================================================
   2. SINGLE ARTICLE PAGE
   ========================================================================== */

.nd .single-post-stage{
  max-width:1120px;
  margin:0 auto;
  padding:80px 60px 0;
}

.nd .single-post-header{
  margin-top:var(--nav-h);
  padding-bottom:36px;
  border-bottom:1px solid var(--gray-mid);
}

.nd .single-post-crumbs{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gray-text);
  margin-bottom:20px;
}
.nd .single-post-crumbs a{
  color:var(--gray-text);
  text-decoration:none;
  transition:color .2s ease;
}
.nd .single-post-crumbs a:hover{
  color:var(--red);
}
.nd .single-post-crumbs span.sep{
  opacity:.4;
}
.nd .single-post-crumbs span.current{
  color:var(--red);
  font-weight:500;
}

.nd .single-post-header h1{
  font-size:clamp(34px,5vw,62px);
  font-weight:200;
  line-height:1.1;
  letter-spacing:-.025em;
  color:var(--black);
  margin-bottom:24px;
}
.nd .single-post-header h1 em{
  font-style:normal;
  color:var(--red);
}

.nd .single-post-meta{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:24px;
  font-size:11px;
  font-weight:400;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gray-text);
}
.nd .single-post-meta span{
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.nd .single-post-meta strong{
  color:var(--black);
  font-weight:500;
}

/* Hero Image with Architectural Framing */
.nd .single-hero-frame{
  margin-top:40px;
  position:relative;
  border:1px solid var(--black);
  background:var(--gray-light);
  overflow:hidden;
}
.nd .single-hero-frame img{
  width:100%;
  max-height:560px;
  object-fit:cover;
  display:block;
}
.nd .single-hero-frame figcaption{
  padding:12px 20px;
  font-family:monospace;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--gray-text);
  background:#fff;
  border-top:1px solid var(--gray-mid);
}

/* Article Body Typography */
.nd .single-content-wrap{
  max-width:760px;
  margin:0 auto;
  padding:64px 0 80px;
}

.nd .entry{
  font-size:16.5px;
  font-weight:300;
  line-height:1.85;
  color:#2b2b2b;
}
.nd .entry p.lead{
  font-size:19px;
  font-weight:300;
  line-height:1.75;
  color:var(--black);
  padding-bottom:12px;
}
.nd .entry>*+*{
  margin-top:1.4em;
}
.nd .entry h2{
  font-size:clamp(22px,2.8vw,30px);
  font-weight:300;
  letter-spacing:-.015em;
  line-height:1.25;
  margin-top:2.2em;
  padding-bottom:10px;
  border-bottom:1px solid var(--gray-mid);
  color:var(--black);
}
.nd .entry h3{
  font-size:20px;
  font-weight:400;
  letter-spacing:.01em;
  margin-top:1.8em;
  color:var(--black);
}
.nd .entry a{
  color:var(--red);
  text-decoration:underline;
  text-underline-offset:3px;
}
.nd .entry strong{
  font-weight:500;
  color:var(--black);
}
.nd .entry ul,.nd .entry ol{
  padding-left:1.4em;
  margin:1.4em 0;
}
.nd .entry li+li{
  margin-top:.6em;
}
.nd .entry blockquote{
  margin:2em 0;
  border-left:3px solid var(--red);
  padding:20px 28px;
  background:#fafafa;
  font-size:18px;
  font-weight:300;
  line-height:1.65;
  color:var(--black);
}

/* Engineering Verification Seal */
.nd .single-author-seal{
  margin-top:60px;
  padding:28px 32px;
  border:1px solid var(--black);
  background:var(--gray-light);
  display:flex;
  align-items:flex-start;
  gap:20px;
}
.nd .single-seal-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  background:#10b981;
  margin-top:5px;
  flex-shrink:0;
  box-shadow:0 0 0 4px rgba(16,185,129,.2);
}
.nd .single-seal-text b{
  display:block;
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--black);
  margin-bottom:6px;
}
.nd .single-seal-text p{
  font-size:13px;
  font-weight:300;
  line-height:1.6;
  color:var(--gray-text);
  margin:0;
}

/* Prev / Next Article Navigation */
.nd .post-nav{
  display:grid;
  grid-template-columns:1fr 1fr;
  border-top:1px solid var(--gray-mid);
  border-bottom:1px solid var(--gray-mid);
  margin-top:60px;
}
.nd .post-nav a{
  padding:36px 48px;
  text-decoration:none;
  color:inherit;
  transition:background .25s ease;
  display:flex;
  flex-direction:column;
}
.nd .post-nav a:hover{
  background:var(--gray-light);
}
.nd .post-nav a:hover strong{
  color:var(--red);
}
.nd .post-nav a+a{
  border-left:1px solid var(--gray-mid);
  text-align:right;
}
.nd .post-nav em{
  display:block;
  font-style:normal;
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  margin-bottom:10px;
}
.nd .post-nav strong{
  font-size:17px;
  font-weight:300;
  line-height:1.35;
  color:var(--black);
  transition:color .2s ease;
}

/* Return to Journal Button */
.nd .single-back-wrap{
  padding:40px 0;
  text-align:center;
}

/* ==========================================================================
   3. RESPONSIVE MEDIA QUERIES
   ========================================================================== */

@media(max-width:1080px){
  .nd .blog-hero,
  .nd .blog-filter-wrap,
  .nd .blog-featured-wrap,
  .nd .blog-grid-wrap,
  .nd .blog-cta,
  .nd .single-post-stage{
    padding-left:40px;
    padding-right:40px;
  }
  .nd .blog-featured-card{
    grid-template-columns:1fr;
  }
  .nd .blog-grid{
    grid-template-columns:repeat(2,1fr);
  }
}

@media(max-width:768px){
  .nd .blog-hero,
  .nd .blog-filter-wrap,
  .nd .blog-featured-wrap,
  .nd .blog-grid-wrap,
  .nd .blog-cta,
  .nd .single-post-stage{
    padding-left:24px;
    padding-right:24px;
  }
  .nd .blog-grid{
    grid-template-columns:1fr;
  }
  .nd .blog-featured-content{
    padding:30px 24px;
  }
  .nd .post-nav{
    grid-template-columns:1fr;
  }
  .nd .post-nav a+a{
    border-left:none;
    border-top:1px solid var(--gray-mid);
    text-align:left;
  }
  .nd .single-post-meta{
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }
}