/* ========================================
   BLOG — Extends main site design system
   ======================================== */
/* ---- BLOG VARIABLES ---- */
:root {
  --blog-max-width: 720px;
  --blog-wide-width: 960px;
  --blog-full-width: 1200px;
}

/* ---- READING PROGRESS BAR ---- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  z-index: 9998;
  transition: none;
}

/* ---- GRAIN OVERLAY ---- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ---- BLOG NAV ---- */
.blog-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 10, 11, 0.8);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}
.blog-nav.scrolled {
  padding: 0.875rem 2rem;
}
.blog-nav-inner {
  max-width: var(--blog-full-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.blog-nav-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  min-height: 44px;
}
.blog-nav-back:hover {
  color: var(--accent);
}
.blog-nav-back svg {
  transition: transform var(--transition);
}
.blog-nav-back:hover svg {
  transform: translateX(-3px);
}
.blog-nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  user-select: none;
}
.blog-nav-logo .accent {
  color: var(--accent);
}
.blog-nav-home {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.blog-nav-home:hover {
  color: var(--text);
}

/* ---- BLOG HERO (Article) ---- */
.blog-hero {
  padding: 8rem 2rem 3rem;
  max-width: var(--blog-wide-width);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.blog-hero-category {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}
.blog-hero-category[data-category="ai-agents"] {
  background: rgba(232, 166, 52, 0.15);
  color: var(--accent);
  border: 1px solid rgba(232, 166, 52, 0.3);
}
.blog-hero-category[data-category="automation"] {
  background: rgba(52, 211, 153, 0.15);
  color: var(--emerald);
  border: 1px solid rgba(52, 211, 153, 0.3);
}
.blog-hero-category[data-category="development"] {
  background: rgba(62, 207, 207, 0.15);
  color: var(--cyan);
  border: 1px solid rgba(62, 207, 207, 0.3);
}
.blog-hero-category[data-category="business"] {
  background: rgba(244, 114, 182, 0.15);
  color: var(--rose);
  border: 1px solid rgba(244, 114, 182, 0.3);
}
.blog-hero-category[data-category="security"] {
  background: rgba(248, 113, 113, 0.15);
  color: #f87171;
  border: 1px solid rgba(248, 113, 113, 0.3);
}
.blog-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.blog-hero-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.blog-hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.blog-hero-meta svg {
  color: var(--text-muted);
}
.blog-hero-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.blog-hero-author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  color: var(--accent);
}
.blog-hero-author strong {
  color: var(--text);
  font-weight: 600;
}

/* ---- BLOG LISTING HERO ---- */
.blog-listing-hero {
  padding: 8rem 2rem 3rem;
  text-align: center;
  position: relative;
  z-index: 2;
}
.blog-listing-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.blog-listing-hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- FILTER BAR ---- */
.blog-filters {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem 2rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
  margin-bottom: 2rem;
}
.blog-filter-btn {
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 40px;
}
.blog-filter-btn:hover {
  color: var(--text-secondary);
  border-color: var(--border);
}
.blog-filter-btn.active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

/* ---- BLOG GRID (Listing) ---- */
.blog-grid {
  max-width: var(--blog-full-width);
  margin: 0 auto;
  padding: 0 2rem 4rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
  position: relative;
  z-index: 2;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.blog-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  opacity: 0;
  transition: opacity var(--transition);
}
.blog-card:hover {
  border-color: var(--border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.blog-card:hover::before {
  opacity: 1;
}
.blog-card-category {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  width: fit-content;
}
.blog-card-category[data-category="ai-agents"] {
  background: rgba(232, 166, 52, 0.12);
  color: var(--accent);
}
.blog-card-category[data-category="automation"] {
  background: rgba(52, 211, 153, 0.12);
  color: var(--emerald);
}
.blog-card-category[data-category="development"] {
  background: rgba(62, 207, 207, 0.12);
  color: var(--cyan);
}
.blog-card-category[data-category="business"] {
  background: rgba(244, 114, 182, 0.12);
  color: var(--rose);
}
.blog-card-category[data-category="security"] {
  background: rgba(248, 113, 113, 0.12);
  color: #f87171;
}
.blog-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}
.blog-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}
.blog-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.blog-card-arrow {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition);
}
.blog-card:hover .blog-card-arrow {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateX(3px);
}

/* ---- BLOG CONTENT (Article body) ---- */
.blog-content {
  max-width: var(--blog-max-width);
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
  position: relative;
  z-index: 2;
}
.blog-content > * + * {
  margin-top: 1.5rem;
}
.blog-content p {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.blog-content strong {
  color: var(--text);
  font-weight: 600;
}
.blog-content em {
  color: var(--cyan);
  font-style: italic;
}

/* Headings */
.blog-content h2 {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
}
.blog-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

/* Links */
.blog-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.blog-content a:hover {
  border-bottom-color: var(--accent);
}

/* Lists */
.blog-content ul,
.blog-content ol {
  padding-left: 1.5rem;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.blog-content ul {
  list-style: disc;
}
.blog-content ol {
  list-style: decimal;
}
.blog-content li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}
.blog-content li::marker {
  color: var(--accent);
}

/* Blockquote */
.blog-content blockquote {
  border-left: 3px solid var(--cyan);
  background: var(--bg-elevated);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
  font-style: italic;
}
.blog-content blockquote p {
  margin: 0;
  font-size: inherit;
}

/* Inline code */
.blog-content code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--surface);
  color: var(--cyan);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
}

/* Code blocks */
.blog-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.blog-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Images */
.blog-content img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin: 2rem 0;
}

/* Horizontal rule */
.blog-content hr {
  border: none;
  height: 1px;
  background: var(--border-subtle);
  margin: 3rem 0;
}

/* ---- BLOG TAGS ---- */
.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  max-width: var(--blog-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 2rem;
  padding-right: 2rem;
  position: relative;
  z-index: 2;
}
.blog-tags span {
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}
.blog-tags span:hover {
  border-color: var(--border);
  color: var(--text);
}

/* ---- BLOG SHARE ---- */
.blog-share {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: var(--blog-max-width);
  margin: 2rem auto 0;
  padding: 0 2rem;
  position: relative;
  z-index: 2;
}
.blog-share-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.blog-share a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition);
}
.blog-share a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(232, 166, 52, 0.08);
}

/* ---- BLOG CTA ---- */
.blog-cta {
  max-width: var(--blog-max-width);
  margin: 4rem auto 0;
  padding: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  position: relative;
  z-index: 2;
  overflow: hidden;
}
.blog-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}
.blog-cta h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.blog-cta p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.blog-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  background: var(--accent);
  color: var(--bg);
}
.blog-cta .btn:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

/* ---- BLOG RELATED ---- */
.blog-related {
  max-width: var(--blog-full-width);
  margin: 4rem auto 0;
  padding: 4rem 2rem;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 2;
}
.blog-related h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}
.blog-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.related-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  opacity: 0;
  transition: opacity var(--transition);
}
.related-card:hover {
  border-color: var(--border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.related-card:hover::before {
  opacity: 1;
}
.related-card-category {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 0.75rem;
}
.related-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.75rem;
}
.related-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---- BLOG FOOTER ---- */
.blog-footer {
  padding: 2rem;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 2;
}
.blog-footer-inner {
  max-width: var(--blog-full-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.blog-footer-logo {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.03em;
}
.blog-footer-logo .accent {
  color: var(--accent);
}
.blog-footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---- REDUCED MOTION ---- */
@media (prefers-reduced-motion: reduce) {
  .reading-progress { display: none; }
  .blog-card { transition: none; }
  .related-card { transition: none; }
}

/* ---- RESPONSIVE ---- */

/* Tablet */
@media (max-width: 1024px) {
  .blog-related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 768px) {
  .blog-nav {
    padding: 1rem 1.5rem;
  }
  .blog-nav.scrolled {
    padding: 0.75rem 1.5rem;
  }
  .blog-hero {
    padding: 6rem 1.5rem 2rem;
  }
  .blog-hero h1 {
    font-size: 1.75rem;
  }
  .blog-hero-meta {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  .blog-listing-hero {
    padding: 6rem 1.5rem 2rem;
  }
  .blog-listing-hero h1 {
    font-size: 2.25rem;
  }
  .blog-filters {
    padding: 1rem 1.5rem;
    gap: 0.4rem;
  }
  .blog-filter-btn {
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
  }
  .blog-grid {
    padding: 0 1.5rem 3rem;
    grid-template-columns: 1fr;
  }
  .blog-content {
    padding: 1.5rem 1.5rem 3rem;
  }
  .blog-content h2 {
    font-size: 1.4rem;
  }
  .blog-content h3 {
    font-size: 1.15rem;
  }
  .blog-content p,
  .blog-content ul,
  .blog-content ol {
    font-size: 1rem;
  }
  .blog-tags {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  .blog-share {
    padding: 0 1.5rem;
  }
  .blog-cta {
    margin-left: 1.5rem;
    margin-right: 1.5rem;
    padding: 2rem 1.5rem;
  }
  .blog-related {
    padding: 3rem 1.5rem;
  }
  .blog-related-grid {
    grid-template-columns: 1fr;
  }
  .blog-footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .blog-hero h1 {
    font-size: 1.5rem;
  }
  .blog-listing-hero h1 {
    font-size: 1.85rem;
  }
  .blog-card {
    padding: 1.5rem;
  }
  .blog-cta {
    padding: 1.75rem 1.25rem;
  }
  .blog-cta h3 {
    font-size: 1.25rem;
  }
  .related-card {
    padding: 1.5rem;
  }
}