/* ============================================================
   Infotech Tutorials — Article Pages
   ============================================================ */

.article-page .site-header {
  position: sticky;
  top: 0;
  background: rgba(7, 11, 20, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 50;
}

.article-page .hero {
  display: none;
}

/* Breadcrumb */
.article-breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xl) 0;
}

.article-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  font-size: var(--fs-xs);
  color: var(--text-dim);
}

.article-breadcrumb li + li::before {
  content: '›';
  margin-right: var(--space-xs);
  opacity: 0.5;
}

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

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

/* Article layout */
.article-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xl) var(--space-3xl);
  display: grid;
  gap: var(--space-2xl);
}

@media (min-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr 16rem;
    align-items: start;
  }

  .article-sidebar {
    position: sticky;
    top: calc(var(--header-h) + var(--space-lg));
  }
}

/* Article header */
.article-header {
  margin-bottom: var(--space-xl);
}

.article-category {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--iris-cyan);
  margin-bottom: var(--space-sm);
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 1.3rem + 1.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.article-lead {
  font-size: var(--fs-md);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 65ch;
  margin-bottom: var(--space-lg);
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--fs-xs);
  color: var(--text-dim);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.article-meta-bar span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* Featured image */
.article-featured {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-medium);
  margin-bottom: var(--space-2xl);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

.article-featured picture,
.article-featured img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* Article body */
.article-body {
  max-width: 65ch;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  line-height: 1.25;
}

.article-body h3 {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.article-body p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.article-body ul,
.article-body ol {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  line-height: 1.7;
}

.article-body li {
  margin-bottom: var(--space-xs);
}

.article-body a {
  color: var(--iris-cyan);
  text-decoration: underline;
  text-decoration-color: rgba(34, 211, 238, 0.35);
  text-underline-offset: 3px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

.article-body a:hover {
  color: var(--iris-violet);
  text-decoration-color: var(--iris-violet);
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-info-box {
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  background: rgba(26, 35, 54, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-medium);
  border-left: 3px solid var(--iris-cyan);
  border-radius: var(--radius-md);
}

.article-info-box p {
  margin: 0;
  color: var(--text-primary);
}

/* FAQ */
.article-faq {
  max-width: 65ch;
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-subtle);
}

.article-faq h2 {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.article-faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.article-faq-item {
  background: rgba(26, 35, 54, 0.55);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.article-faq-item[open] {
  border-color: var(--border-medium);
}

.article-faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  font-size: var(--fs-base);
  cursor: pointer;
  list-style: none;
}

.article-faq-item summary::-webkit-details-marker {
  display: none;
}

.article-faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--iris-cyan);
  transition: transform var(--transition);
}

.article-faq-item[open] summary::after {
  transform: rotate(45deg);
}

.article-faq-item p {
  padding: 0 var(--space-lg) var(--space-md);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Sidebar */
.article-sidebar-title {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: var(--space-md);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.related-link {
  display: block;
  padding: var(--space-md);
  background: rgba(26, 35, 54, 0.55);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-link:hover {
  border-color: rgba(34, 211, 238, 0.35);
  box-shadow: 0 0 20px var(--glow-cyan);
  color: var(--iris-cyan);
}

/* Article CTA */
.article-cta {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-3xl);
}

.article-cta-inner {
  position: relative;
  padding: var(--space-2xl);
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.article-cta-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-iris-soft);
  opacity: 0.5;
  pointer-events: none;
}

.article-cta-inner h2 {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.article-cta-inner p {
  position: relative;
  color: var(--text-secondary);
  max-width: 40ch;
  margin: 0 auto var(--space-lg);
  font-size: var(--fs-md);
}

.article-cta-inner .btn-iridescent {
  position: relative;
  display: inline-flex;
}

.article-page .site-footer {
  border-top: 1px solid var(--border-subtle);
}

@media (min-width: 768px) {
  .article-breadcrumb,
  .article-layout,
  .article-cta {
    padding-left: var(--space-2xl);
    padding-right: var(--space-2xl);
  }
}