/*
 * single.css — Article Reading Experience
 * NextAIWorks Theme v3.0 — Milestone 4
 *
 * Design reference: Medium, Towards Data Science, Substack, The Pragmatic Engineer.
 * Core principle: Maximum readability at comfortable line length (65–72ch).
 * ============================================================ */

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */
.pub-reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient( 90deg, var(--brand-blue) 0%, #7C3AED 100% );
  z-index: 10000;
  transition: width 100ms linear;
  border-radius: 0 2px 2px 0;
  pointer-events: none;
}

/* ============================================================
   ARTICLE HEADER
   ============================================================ */
.pub-article-header {
  max-width: 720px;
  margin-inline: auto;
  padding-block: var(--space-8) var(--space-6);
}
.pub-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.pub-breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 150ms;
}
.pub-breadcrumb a:hover { color: var(--brand-blue); }
.pub-breadcrumb-sep { color: var(--border-strong); }

.pub-article-eyebrow {
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.pub-article-title {
  font-family: var(--font-ui);
  font-size: clamp( 1.7rem, 4.5vw, 2.6rem );
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: var(--brand-navy);
  margin-bottom: var(--space-4);
}

/* Meta bar */
.pub-article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-color);
}
.pub-article-meta a {
  color: var(--brand-navy);
  font-weight: 600;
  text-decoration: none;
}
.pub-article-meta a:hover { color: var(--brand-blue); }
.pub-article-meta-sep { color: var(--border-strong); }
.pub-meta-date { font-variant-numeric: tabular-nums; }

/* ============================================================
   SHARE BUTTONS (below article meta)
   ============================================================ */
.pub-share {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.pub-share-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-right: var(--space-1);
}
.pub-share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  background: var(--bg-card);
  cursor: pointer;
  transition: all 200ms ease;
  line-height: 1;
}
.pub-share-btn:hover {
  border-color: var(--border-strong);
  color: var(--brand-navy);
  background: var(--bg-muted);
}
.pub-share-btn--twitter:hover { color: #000; border-color: #000; }
.pub-share-btn--linkedin:hover { color: #0A66C2; border-color: #0A66C2; }
.pub-share-btn.is-copied { color: #059669; border-color: #059669; }

/* ============================================================
   FEATURED IMAGE — full-width cinematic
   ============================================================ */
.pub-article-img {
  max-width: 900px;
  margin-inline: auto;
  margin-bottom: var(--space-6);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.pub-article-img img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-height: 520px;
}

/* ============================================================
   TABLE OF CONTENTS
   ============================================================ */
.pub-toc {
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--brand-blue);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin: var(--space-6) 0;
  max-width: 720px;
  margin-inline: auto;
}
.pub-toc-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brand-navy);
  margin-bottom: var(--space-4);
}
.pub-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.pub-toc-item { margin: 0; }
.pub-toc-item--h3 { padding-left: var(--space-4); }
.pub-toc-link {
  display: block;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  line-height: 1.4;
  transition: color 150ms, background 150ms;
}
.pub-toc-link:hover,
.pub-toc-link.is-active {
  color: var(--brand-blue);
  background: rgba(37,99,235,0.06);
}
.pub-toc-link.is-active { font-weight: 600; }

/* ============================================================
   ARTICLE CONTENT — The Reading Canvas
   ============================================================ */
.pub-article-content {
  max-width: 720px;
  margin-inline: auto;
  font-family: var(--font-serif, var(--font-body));
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-body);
  word-break: break-word;
}

/* Headings */
.pub-article-content h2 {
  font-family: var(--font-ui);
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--brand-navy);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  scroll-margin-top: 80px;
}
.pub-article-content h3 {
  font-family: var(--font-ui);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--brand-navy);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  scroll-margin-top: 80px;
}
.pub-article-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--brand-navy);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

/* Paragraphs, lists */
.pub-article-content p { margin-bottom: var(--space-5); }
.pub-article-content ul,
.pub-article-content ol { margin: 0 0 var(--space-5) var(--space-5); }
.pub-article-content li { margin-bottom: var(--space-1); }

/* Links */
.pub-article-content a {
  color: var(--brand-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 150ms;
}
.pub-article-content a:hover { color: var(--brand-navy); }

/* Blockquote */
.pub-article-content blockquote {
  border-left: 4px solid var(--brand-blue);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-8) 0;
  background: rgba(37,99,235,0.04);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-muted);
}
.pub-article-content blockquote p:last-child { margin-bottom: 0; }
.pub-article-content blockquote cite {
  font-size: 0.85rem;
  font-style: normal;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: var(--space-2);
  display: block;
}

/* Horizontal rule */
.pub-article-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: var(--space-10) 0;
}

/* Inline code */
.pub-article-content code:not(pre code) {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  font-size: 0.88em;
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1px 6px;
  color: #B45309;
  white-space: nowrap;
}

/* ============================================================
   CODE BLOCKS — Premium dark theme
   ============================================================ */
.pub-code-wrap {
  position: relative;
  margin: var(--space-7) 0;
}
.pub-article-content pre {
  background: #0F1117;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  overflow-x: auto;
  margin: 0;
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.pub-article-content pre::-webkit-scrollbar { height: 5px; }
.pub-article-content pre::-webkit-scrollbar-track { background: transparent; }
.pub-article-content pre::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 10px; }
.pub-article-content pre code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  color: #E2E8F0;
  background: none;
  border: none;
  padding: 0;
  white-space: pre;
}

/* Copy button inside code block */
.pub-code-copy {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.55);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  transition: all 200ms ease;
  line-height: 1;
  font-family: var(--font-ui);
  letter-spacing: 0.02em;
}
.pub-code-copy:hover {
  background: rgba(255,255,255,0.14);
  color: #fff;
}
.pub-code-copy.is-copied {
  background: rgba(5,150,105,0.2);
  border-color: rgba(5,150,105,0.4);
  color: #34D399;
}

/* ============================================================
   CALLOUT BOXES (custom Gutenberg blocks or shortcodes)
   ============================================================ */
.pub-callout,
.wp-block-nextaiworks-callout {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  margin: var(--space-7) 0;
  font-size: 0.95rem;
  line-height: 1.65;
}
.pub-callout--tip  { background: rgba(5,150,105,0.07);  border-left: 4px solid #059669; }
.pub-callout--warn { background: rgba(234,140,0,0.08);  border-left: 4px solid #EA8C00; }
.pub-callout--note { background: rgba(37,99,235,0.07);  border-left: 4px solid var(--brand-blue); }

/* ============================================================
   TABLES
   ============================================================ */
.pub-article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-7) 0;
  font-size: 0.9rem;
  overflow-x: auto;
  display: block;
}
.pub-article-content th {
  background: var(--bg-muted);
  font-weight: 700;
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--border-strong);
  color: var(--brand-navy);
  white-space: nowrap;
}
.pub-article-content td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
}
.pub-article-content tr:last-child td { border-bottom: none; }
.pub-article-content tr:hover td { background: var(--bg-muted); }

/* ============================================================
   IMAGES inside content — responsive + captions
   ============================================================ */
.pub-article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  margin-inline: auto;
}
.pub-article-content figure { margin: var(--space-7) 0; }
.pub-article-content figcaption {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: var(--space-2);
  font-style: italic;
}

/* ============================================================
   AUTHOR BIO
   ============================================================ */
.pub-author-bio {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-10) auto;
  max-width: 720px;
}
.pub-author-bio-avatar img {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--border-color);
}
.pub-author-bio-name {
  font-weight: 800;
  font-size: 1rem;
  color: var(--brand-navy);
  margin-bottom: var(--space-1);
}
.pub-author-bio-name a { color: inherit; text-decoration: none; }
.pub-author-bio-name a:hover { color: var(--brand-blue); }
.pub-author-bio-desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; margin: 0; }

/* ============================================================
   TAGS
   ============================================================ */
.pub-article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border-color);
  max-width: 720px;
  margin-inline: auto;
}
.pub-article-tags-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.pub-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 3px 12px;
  text-decoration: none;
  transition: all 200ms ease;
}
.pub-tag:hover {
  background: var(--brand-navy);
  color: #fff;
  border-color: var(--brand-navy);
}

/* ============================================================
   POST NAVIGATION
   ============================================================ */
.pub-post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin: var(--space-10) auto;
  max-width: 720px;
}
.pub-post-nav a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-5);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 200ms ease;
}
.pub-post-nav a:hover {
  border-color: var(--brand-blue);
  box-shadow: var(--shadow-md);
}
.pub-post-nav-next { text-align: right; }
.pub-post-nav-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-blue);
}
.pub-post-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--brand-navy);
  line-height: 1.4;
}

/* ============================================================
   RELATED ARTICLES
   ============================================================ */
.pub-related {
  margin: var(--space-12) auto;
  max-width: 900px;
}
.pub-related-grid {
  display: grid;
  grid-template-columns: repeat( 3, 1fr );
  gap: var(--space-5);
  margin-top: var(--space-5);
}

/* ============================================================
   COMMENTS
   ============================================================ */
.pub-comments-area {
  max-width: 720px;
  margin: var(--space-10) auto var(--space-16);
}
.pub-comments-area .comment-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-8);
}
.pub-comments-area .comment-body {
  padding: var(--space-5);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}
.pub-comments-area .comment-author-name { font-weight: 700; color: var(--brand-navy); }
.pub-comments-area .comment-metadata { font-size: 0.8rem; color: var(--text-muted); }
.pub-comments-area .comment-content p { margin-bottom: 0; font-size: 0.95rem; }

/* ============================================================
   RESPONSIVE — Single Post
   ============================================================ */
@media ( max-width: 900px ) {
  .pub-article-header,
  .pub-toc,
  .pub-article-content,
  .pub-author-bio,
  .pub-post-nav,
  .pub-article-tags { max-width: 100%; padding-inline: var(--space-4); }
  .pub-article-img { margin-inline: var(--space-4); }
}
@media ( max-width: 640px ) {
  .pub-article-title { font-size: 1.5rem; }
  .pub-related-grid { grid-template-columns: 1fr; }
  .pub-post-nav { grid-template-columns: 1fr; }
  .pub-author-bio { flex-direction: column; }
  .pub-article-content h2 { font-size: 1.35rem; }
}