/* Reading Progress Bar */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: var(--gradient-brand);
  width: 0%;
  z-index: 1001;
  transition: width 0.1s ease-out;
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.8);
}

/* Article Hero Header */
.article-header {
  padding: 60px 0 40px 0;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-breadcrumb a {
  color: var(--text-secondary);
}

.article-breadcrumb a:hover {
  color: var(--accent-cyan);
}

.article-main-title {
  font-size: 3.2rem;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  max-width: 980px;
}

.article-deck {
  font-size: 1.35rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 880px;
  margin-bottom: 36px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.author-meta-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.author-avatar-large {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #080c14;
  font-size: 1.2rem;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.35);
}

.author-details-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-details-role {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-stats-pills {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-pill-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

/* Article Body Layout: 3 Columns (TOC, Content, Sidebar/Actions) */
.article-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 56px;
  padding: 60px 0 100px 0;
  position: relative;
}

/* Sticky Table of Contents Sidebar */
.toc-sidebar {
  position: sticky;
  top: 100px;
  height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.toc-sidebar::-webkit-scrollbar {
  width: 4px;
}
.toc-sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.toc-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 20px;
}

.toc-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.toc-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

.toc-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.08);
  border-left-color: var(--accent-cyan);
  font-weight: 600;
}

.toc-sublink {
  padding-left: 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.toc-share-box {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.share-buttons {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.share-btn {
  flex: 1;
  padding: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  background: rgba(0, 242, 254, 0.15);
  color: #fff;
  border-color: var(--accent-cyan);
}

/* Article Core Content Typography */
.article-content {
  color: #cbd5e1;
  font-size: 1.12rem;
  line-height: 1.85;
  letter-spacing: -0.01em;
}

.article-content h2 {
  font-size: 2.15rem;
  line-height: 1.25;
  margin-top: 56px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #fff;
  scroll-margin-top: 100px;
}

.article-content h3 {
  font-size: 1.5rem;
  margin-top: 36px;
  margin-bottom: 16px;
  color: #f1f5f9;
  scroll-margin-top: 100px;
}

.article-content h4 {
  font-size: 1.2rem;
  margin-top: 28px;
  margin-bottom: 12px;
  color: #e2e8f0;
}

.article-content p {
  margin-bottom: 24px;
  color: #cbd5e1;
}

.article-content strong {
  color: #ffffff;
  font-weight: 600;
}

.article-content ul, .article-content ol {
  margin-bottom: 28px;
  padding-left: 28px;
}

.article-content li {
  margin-bottom: 10px;
  color: #cbd5e1;
}

/* Callout Alerts */
.callout {
  padding: 24px 28px;
  border-radius: var(--radius-md);
  margin: 36px 0;
  background: rgba(15, 23, 42, 0.7);
  border-left: 4px solid;
}

.callout-title {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.callout.tip {
  border-left-color: var(--accent-cyan);
  background: linear-gradient(90deg, rgba(0, 242, 254, 0.08) 0%, rgba(15, 23, 42, 0.5) 100%);
}
.callout.tip .callout-title { color: var(--accent-cyan); }

.callout.important {
  border-left-color: var(--accent-emerald);
  background: linear-gradient(90deg, rgba(16, 185, 129, 0.08) 0%, rgba(15, 23, 42, 0.5) 100%);
}
.callout.important .callout-title { color: #34d399; }

.callout.warning {
  border-left-color: var(--accent-amber);
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.08) 0%, rgba(15, 23, 42, 0.5) 100%);
}
.callout.warning .callout-title { color: #fbbf24; }

.callout.architecture {
  border-left-color: var(--accent-purple);
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.08) 0%, rgba(15, 23, 42, 0.5) 100%);
}
.callout.architecture .callout-title { color: #c084fc; }

/* Code Blocks with Header and Copy Button */
.code-block-wrapper {
  margin: 36px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: #090d16;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: #0f172a;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.code-lang-tag {
  color: var(--accent-cyan);
  font-weight: 600;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent-cyan);
  color: #080c14;
  font-weight: 600;
}

pre code {
  display: block;
  padding: 22px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.65;
  color: #e2e8f0;
  overflow-x: auto;
  tab-size: 2;
}

/* Syntax Highlighting Mock Tokens */
.code-kw { color: #f472b6; }
.code-fn { color: #60a5fa; }
.code-str { color: #34d399; }
.code-com { color: #64748b; font-style: italic; }
.code-var { color: #facc15; }
.code-num { color: #c084fc; }

/* Comparative Tables */
.table-container {
  margin: 36px 0;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.5);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.data-table th {
  background: #0f172a;
  color: #fff;
  padding: 16px 20px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

/* Architecture Flow Diagrams */
.diagram-box {
  margin: 40px 0;
  padding: 32px;
  background: radial-gradient(circle at center, rgba(15, 23, 42, 0.9) 0%, #080c14 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glow);
}

.diagram-title {
  text-align: center;
  font-size: 1.15rem;
  margin-bottom: 24px;
  color: var(--accent-cyan);
}

.pipeline-nodes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  position: relative;
}

.node-card {
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  text-align: center;
  position: relative;
}

.node-step {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.node-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  margin-bottom: 8px;
}

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

/* Key Takeaway Box */
.takeaway-banner {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(0, 242, 254, 0.15) 100%);
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin: 48px 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.takeaway-banner h3 {
  color: #fff;
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.4rem;
}

.takeaway-banner ul {
  margin-bottom: 0;
}

.takeaway-banner li {
  color: #f1f5f9;
  font-weight: 500;
}

/* Author Bio Card */
.author-bio-card {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  gap: 28px;
  margin: 64px 0 40px 0;
  align-items: center;
}

.bio-avatar {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: #080c14;
  flex-shrink: 0;
}

.bio-content h4 {
  font-size: 1.25rem;
  margin-bottom: 6px;
}

.bio-content .bio-role {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.bio-content p {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 0;
}

/* Article CTA Box */
.article-cta-box {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  margin: 64px 0;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 30px rgba(139, 92, 246, 0.2);
}

.article-cta-box h3 {
  font-size: 2rem;
  margin-bottom: 14px;
  color: #fff;
}

.article-cta-box p {
  max-width: 600px;
  margin: 0 auto 28px auto;
  font-size: 1.05rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .toc-sidebar {
    position: relative;
    top: 0;
    height: auto;
    margin-bottom: 40px;
  }
  .pipeline-nodes {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-main-title {
    font-size: 2.4rem;
  }
}

@media (max-width: 640px) {
  .article-main-title {
    font-size: 1.95rem;
  }
  .article-deck {
    font-size: 1.1rem;
  }
  .pipeline-nodes {
    grid-template-columns: 1fr;
  }
  .author-bio-card {
    flex-direction: column;
    text-align: center;
  }
  .bio-avatar {
    margin: 0 auto;
  }
  .article-cta-box {
    padding: 32px 20px;
  }
}