/* ==========================================================================
   SENDLO BLOG STYLESHEET (Linear × Modern AI SaaS × Editorial Clean)
   ========================================================================== */

/* Active Navbar State for Blog */
.nav-links-desktop li.active-nav > a,
.nav-links-desktop li > a.active-link {
  color: var(--sendlo-blue) !important;
  font-weight: 700 !important;
}

/* ==========================================
   1. BLOG HERO SECTION
   ========================================== */
.blog-hero-section {
  /* top padding clears the fixed site header (~94px) */
  padding: 8rem 0 3rem 0;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 30%, rgba(0, 146, 254, 0.06) 0%, rgba(248, 250, 252, 0) 70%);
}

.blog-hero-container {
  max-width: 820px;
  margin: 0 auto;
}

.blog-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  background: rgba(0, 146, 254, 0.08);
  border: 1px solid rgba(0, 146, 254, 0.2);
  color: var(--sendlo-blue);
  font-size: 0.8125rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin-bottom: 1.25rem;
}

.blog-hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.blog-hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 450;
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================
   2. FEATURED ARTICLE SECTION
   ========================================== */
.featured-article-section {
  margin-bottom: 4rem;
}

.featured-article-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  box-shadow: 0 15px 40px rgba(0, 146, 254, 0.08);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

.featured-article-card:hover {
  transform: translateY(-4px);
  border-color: var(--sendlo-blue);
  box-shadow: 0 25px 60px rgba(0, 146, 254, 0.15);
}

.featured-visual-box {
  background: linear-gradient(135deg, #00122E 0%, #002B66 100%);
  padding: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.featured-badge-pill {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  color: #FFFFFF;
  font-size: 0.675rem;
  font-weight: 800;
  font-family: var(--font-mono);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.08em;
}

.featured-content-box {
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.article-cat-tag {
  font-size: 0.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--sendlo-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.65rem;
}

.featured-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.featured-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.75rem;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.read-cta-link {
  color: var(--sendlo-blue);
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap var(--transition-fast);
}

.featured-article-card:hover .read-cta-link {
  gap: 0.65rem;
}

/* Abstract SVG Visual Cards */
.blog-svg-visual {
  width: 100%;
  max-width: 320px;
  height: 200px;
}

/* ==========================================
   3. SEARCH & CATEGORY FILTER BAR
   ========================================== */
.blog-filter-bar {
  margin-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.blog-search-box {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

.search-input-icon {
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

.blog-search-input {
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 3rem;
  border-radius: 16px;
  border: 1px solid var(--border-light);
  background: var(--bg-primary);
  font-size: 0.95rem;
  color: var(--text-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: all var(--transition-fast);
  outline: none;
}

.blog-search-input:focus {
  border-color: var(--sendlo-blue);
  box-shadow: 0 8px 24px rgba(0, 146, 254, 0.15);
}

.category-pills-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.cat-pill-btn {
  padding: 0.5rem 1.15rem;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cat-pill-btn:hover {
  border-color: var(--sendlo-blue);
  color: var(--sendlo-blue);
  background: #F0F9FF;
}

.cat-pill-btn.active {
  background: var(--sendlo-blue);
  border-color: var(--sendlo-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(0, 146, 254, 0.3);
}

/* ==========================================
   4. BLOG ARTICLE GRID
   ========================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3.5rem;
}

.blog-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.03);
}

.blog-card:hover {
  transform: translateY(-6px);
  border-color: var(--sendlo-blue);
  box-shadow: 0 16px 40px rgba(0, 146, 254, 0.12);
}

.blog-card-visual {
  height: 140px;
  border-radius: 12px;
  background: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.blog-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.65rem;
  letter-spacing: -0.01em;
}

.blog-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex: 1;
}

.no-results-box {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-primary);
  border: 1px dashed var(--border-light);
  border-radius: 20px;
  grid-column: 1 / -1;
}

.no-results-box h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.no-results-box p {
  color: var(--text-secondary);
}

.load-more-row {
  text-align: center;
  margin-bottom: 5rem;
}

.btn-load-more {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  transition: all var(--transition-fast);
}

.btn-load-more:hover {
  border-color: var(--sendlo-blue);
  color: var(--sendlo-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 146, 254, 0.15);
}

/* ==========================================
   5. BLOG NEWSLETTER CTA
   ========================================== */
.blog-newsletter-section {
  background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
  border: 1px solid rgba(0, 146, 254, 0.2);
  border-radius: 24px;
  padding: 3.5rem 2.5rem;
  text-align: center;
  margin-bottom: 4rem;
}

.blog-newsletter-section h3 {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 0.65rem;
}

.blog-newsletter-section p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 1.75rem auto;
}

.newsletter-form-inline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto 0.75rem auto;
}

.newsletter-input {
  flex: 1;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: var(--bg-primary);
  font-size: 0.95rem;
  outline: none;
}

.newsletter-input:focus {
  border-color: var(--sendlo-blue);
}

.newsletter-subtext {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* ==========================================
   6. INDIVIDUAL ARTICLE EDITORIAL LAYOUT
   ========================================== */
.article-header-section {
  padding: 7.5rem 0 2.5rem 0;
  max-width: 800px;
  margin: 0 auto;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.article-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.article-breadcrumb a:hover {
  color: var(--sendlo-blue);
}

.article-main-title {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.article-main-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 450;
  margin-bottom: 1.75rem;
}

.article-author-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.author-orb {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 146, 254, 0.25);
}

.author-orb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
}

.author-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Article Hero Visual Banner */
.article-banner-hero {
  max-width: 960px;
  margin: 0 auto 3.5rem auto;
  border-radius: 24px;
  background: linear-gradient(135deg, #00122E 0%, #002B66 100%);
  padding: 4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 50px rgba(0, 146, 254, 0.15);
}

/* Article Layout Grid (Main Article Body + Sticky TOC) */
.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  max-width: 1100px;
  margin: 0 auto 5rem auto;
  align-items: start;
}

.article-content-body {
  max-width: 760px;
  font-size: 1.125rem;
  line-height: 1.75;
  color: #334155;
}

.article-content-body p.lead-text {
  font-size: 1.25rem;
  font-weight: 500;
  color: #1E293B;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.article-content-body h2 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 2.75rem 0 1rem 0;
}

.article-content-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem 0;
}

.blog-callout {
  background: #F0F9FF;
  border-left: 4px solid var(--sendlo-blue);
  padding: 1.5rem;
  border-radius: 0 14px 14px 0;
  margin: 2rem 0;
}

.callout-title {
  font-size: 0.85rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--sendlo-blue);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.workflow-diagram-card {
  background: #00122E;
  border-radius: 18px;
  padding: 1.75rem;
  margin: 2.5rem 0;
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #FFFFFF;
}

.wf-diagram-title {
  font-size: 0.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #38BDF8;
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
}

.wf-flow-nodes {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.wf-node {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 0.85rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.wf-node .node-tag {
  font-size: 0.625rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #38BDF8;
}

.wf-node .node-label {
  font-size: 0.85rem;
  font-weight: 800;
  color: #FFFFFF;
}

.wf-node .node-sub {
  font-size: 0.7rem;
  color: #94A3B8;
}

.wf-arrow {
  color: #38BDF8;
  font-size: 1.1rem;
}

.code-block {
  background: #0F172A;
  color: #F8FAFC;
  padding: 1.25rem 1.5rem;
  border-radius: 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid #1E293B;
}

.styled-bullets, .styled-list {
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Sticky Table of Contents Sidebar */
.article-toc-sidebar {
  position: sticky;
  top: 6rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.03);
}

.toc-header {
  font-size: 0.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--sendlo-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.toc-list a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  line-height: 1.4;
  transition: all var(--transition-fast);
  display: block;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--sendlo-blue);
  font-weight: 700;
  transform: translateX(4px);
}

/* Related Articles Section */
.related-articles-section {
  padding-top: 4rem;
  border-top: 1px solid var(--border-subtle);
  margin-bottom: 5rem;
}

/* ==========================================
   7. RESPONSIVE BREAKPOINTS FOR BLOG
   ========================================== */
@media (max-width: 992px) {
  .featured-article-card {
    grid-template-columns: 1fr;
  }
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
  .article-toc-sidebar {
    position: static;
    margin-bottom: 2rem;
  }
  .wf-flow-nodes {
    flex-direction: column;
  }
  .wf-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 640px) {
  .blog-hero-title {
    font-size: 2.25rem;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .article-main-title {
    font-size: 2.15rem;
  }
  .newsletter-form-inline {
    flex-direction: column;
  }
  .newsletter-input, .newsletter-form-inline button {
    width: 100%;
  }
}