/* ═══════════════════════════════════════════════════════════════
   ARTICLE.CSS — Long-form Engineering Deep-Dives & AdSense Ready
   ═══════════════════════════════════════════════════════════════ */

.article-hero {
  padding: 5rem 0 3.5rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.article-breadcrumbs a {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur-fast);
}

.article-breadcrumbs a:hover {
  color: var(--blue-500);
}

.article-breadcrumbs span.sep {
  opacity: 0.5;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 1.5rem;
  max-width: 950px;
}

.article-author-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.article-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.article-avatar {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.article-author-info strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text);
}

.article-author-info span {
  font-size: 0.8rem;
  color: var(--text-3);
}

.article-stats {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-2);
}

.article-stat-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ── Article Layout ── */
.article-section {
  padding: 4rem 0 6rem;
  background: var(--bg);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 3.5rem;
  align-items: start;
}

/* ── Content Styling ── */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-2);
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin: 3rem 0 1.25rem;
  padding-top: 1rem;
  position: relative;
  scroll-margin-top: 100px;
}

.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  margin: 2rem 0 0.85rem;
  scroll-margin-top: 100px;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
  margin: 1rem 0 1.75rem 1.75rem;
}

.article-body li {
  margin-bottom: 0.6rem;
}

.article-lead {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--text);
  font-weight: 400;
  margin-bottom: 2rem;
  border-left: 4px solid var(--blue-500);
  padding-left: 1.25rem;
}

/* ── Code Blocks ── */
.code-box {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: 2rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #A1A1AA;
}

.code-header .lang-tag {
  color: var(--cyan-400);
  font-weight: 600;
  text-transform: uppercase;
}

.code-box pre {
  margin: 0;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  color: #E4E4E7;
}

/* ── Callouts & Key Takeaways ── */
.takeaway-box {
  background: rgba(37,99,235,0.06);
  border: 1px solid rgba(37,99,235,0.25);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin: 2.5rem 0;
}

[data-theme="dark"] .takeaway-box {
  background: rgba(99,102,241,0.08);
  border-color: rgba(99,102,241,0.3);
}

.takeaway-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.takeaway-box ul {
  margin: 0 0 0 1.25rem;
  padding: 0;
}

/* ── AdSense Compliant Containers ── */
.ad-slot-container {
  margin: 3rem 0;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px dashed var(--border-2);
  border-radius: var(--radius-md);
  text-align: center;
}

.ad-slot-label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.ad-placeholder {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-2);
  border: 1px solid var(--border);
}

/* ── Article Sidebar ── */
.article-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-widget {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.sidebar-widget h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 0.6rem;
}

.toc-list a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.4;
  display: block;
  transition: all var(--dur-fast);
  padding-left: 0.5rem;
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  color: var(--blue-500);
  border-left-color: var(--blue-500);
}

.sidebar-cta {
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(6,182,212,0.06));
  border: 1px solid var(--border-blue);
}

.sidebar-cta h4 {
  color: var(--blue-600);
}

.sidebar-cta p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* ── Author Bio Box ── */
.author-bio-card {
  margin-top: 4rem;
  padding: 2.25rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.author-bio-avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 800;
  flex-shrink: 0;
}

.author-bio-text h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.author-bio-role {
  font-size: 0.85rem;
  color: var(--blue-500);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.author-bio-text p {
  margin: 0;
  font-size: 0.925rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ── Article Footer / Pagination ── */
.article-nav-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.article-nav-card {
  padding: 1.25rem 1.5rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--dur-fast);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.article-nav-card:hover {
  border-color: var(--border-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.article-nav-card .nav-dir {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-3);
  font-weight: 600;
}

.article-nav-card .nav-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

@media (max-width: 992px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 600px) {
  .author-bio-card {
    flex-direction: column;
    text-align: center;
  }
  .article-nav-row {
    grid-template-columns: 1fr;
  }
}