/* ═══════════════════════════════════════
   SINGLE ARTICLE — reading experience
═══════════════════════════════════════ */

/* Article breadcrumb */
.article-breadcrumb {
  background: var(--surface);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
  padding: 0.65rem 0;
  position: sticky;
  top: var(--header-h);
  z-index: 90;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.article-breadcrumb::-webkit-scrollbar { display: none; }
.article-breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.article-breadcrumb-inner a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
  flex-shrink: 0;
}
.article-breadcrumb-inner a:hover { color: var(--accent); }
.article-breadcrumb-sep {
  color: var(--text-muted);
  opacity: 0.4;
  font-size: 0.7rem;
  flex-shrink: 0;
}
.article-breadcrumb-current {
  color: var(--text-secondary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex-shrink: 0;
}

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: var(--header-h);
  left: 0;
  height: 2px;
  background: var(--accent);
  width: 0%;
  z-index: 90;
  transition: width 0.1s ease-out;
}

/* ── Article Hero (with image) ── */
.article-hero {
  position: relative;
  width: 100%;
  height: 400px;
  overflow: hidden;
  background: var(--surface);
}
.article-hero.has-image { height: 420px; }
.article-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
}
.article-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, var(--media-scrim-hero-top) 0%, var(--media-scrim-hero-bottom) 100%);
}
.article-hero-content {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--max-w);
  z-index: 2;
  padding: 3rem var(--space-container) 2.5rem;
}
.article-hero-category {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-fg);
  background: var(--accent);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  margin-bottom: 1rem;
}
.article-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-on-media);
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 720px;
  text-shadow: 0 2px 20px color-mix(in srgb, #000000 30%, transparent);
}
.article-hero-meta {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.article-hero-meta span {
  font-size: 0.78rem;
  color: var(--text-on-media-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* ── Article Header (no image) ── */
.article-header {
  padding: var(--space-section) 0 var(--space-lg);
  margin-bottom: 0;
  position: relative;
  background: var(--bg);
}
.article-header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.article-category {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 1rem;
}
.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.article-author { font-weight: 600; color: var(--text-secondary); }

/* ── Article Body ── */
.article-body {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-section) var(--space-container);
}
.article-excerpt {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface-2);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  font-style: italic;
}
.article-content {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-secondary);
}
.article-content h2 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.02em;
  padding-bottom: 0.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.article-content h2::before {
  content: '';
  width: 3px;
  height: 1.1em;
  background: var(--accent);
  border-radius: 2px;
  flex-shrink: 0;
}
.article-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.75rem 0 0.75rem;
}
.article-content p { margin-bottom: 1.1rem; }
.article-content ul, .article-content ol { margin: 0.75rem 0 1.25rem 1.5rem; }
.article-content li { margin-bottom: 0.4rem; }
.article-content strong { color: var(--text-primary); font-weight: 700; }
.article-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.article-content a:hover { opacity: 0.8; }
.article-content code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85em;
  background: var(--surface-3);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--border);
}
.article-content pre {
  background: var(--code-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  border: 1px solid var(--code-border);
}
.article-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--code-text);
  font-size: 0.85rem;
  line-height: 1.7;
}
.article-content blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
.article-content th {
  background: var(--surface-2);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}
.article-content td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
  color: var(--text-secondary);
}
.article-content tr:last-child td { border-bottom: none; }
.article-content tr:nth-child(even) td { background: var(--surface); }

/* ── Tags ── */
.article-tags {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding-top: 0.25rem;
}
.article-tags-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 0.25rem;
}
.article-tag {
  text-decoration: none;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.65rem;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}
.article-tag:hover {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  color: var(--accent);
}

/* ── Related Articles ── */
.related-section {
  padding: var(--space-section) var(--space-container);
  background: var(--bg);
}
.related-header {
  text-align: center;
  margin-bottom: 2.5rem;
}
.related-header h3 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.related-header p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.related-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.related-card:hover {
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.related-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
  background: var(--surface-2);
}
.related-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease, opacity 0.3s ease;
  opacity: 0.88;
}
.related-card:hover .related-card-img img {
  transform: scale(1.06);
  opacity: 1;
}
.related-card-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--accent) 8%, var(--bg));
  color: var(--accent);
  opacity: 0.5;
}
.related-card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.related-card-category {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.related-card-title {
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: break-word;
  transition: color 0.2s ease;
}
.related-card:hover .related-card-title { color: var(--accent); }
.related-card-excerpt {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.875rem;
  flex: 1;
}
.related-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  gap: 0.5rem;
}
.related-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}
.related-card-arrow {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  transition: background 0.2s ease, transform 0.2s ease;
}
.related-card:hover .related-card-arrow {
  background: color-mix(in srgb, var(--accent) 25%, transparent);
  transform: translateX(2px);
}

/* ── Back Nav ── */
.article-nav {
  padding: 0 var(--space-container) var(--space-section);
  background: var(--bg);
}
.article-nav-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.article-nav-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.25s ease;
  text-decoration: none;
}
.article-nav-item:hover {
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 8%, transparent);
}
.article-nav-item.next {
  text-align: right;
  align-items: flex-end;
}
.article-nav-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.article-nav-item.next .article-nav-label {
  justify-content: flex-end;
}
.article-nav-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color 0.2s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-nav-item:hover .article-nav-title { color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .article-hero { height: 280px; }
  .article-hero.has-image { height: 320px; }
  .article-hero-content { padding: 2rem 1rem 1.5rem; }
  .article-hero h1 { font-size: 1.3rem; }
  .related-grid { grid-template-columns: 1fr; }
  .article-hero-meta { gap: 0.75rem; }
  .article-body { padding: 2rem 1rem 3rem; }
}
@media (max-width: 480px) {
  .article-hero { height: 220px; }
  .article-hero.has-image { height: 240px; }
}