/* ============================================================
   PLabs eBook Store – blog.css
   Blog System Styles for Lumina Digital Noir
   ============================================================ */

/* ── Blog Layout & Containers ────────────────────────────── */
.blog-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding-top: calc(var(--nav-height) + var(--space-8));
  padding-bottom: var(--space-16);
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 1024px) {
  .blog-grid {
    grid-template-columns: 280px 1fr;
    gap: var(--space-12);
  }
}

.blog-main {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .blog-main {
    margin: 0;
  }
}

/* ── Breadcrumb ────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-on-surface-variant);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.breadcrumb-link {
  color: var(--color-vibrant-orange);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb-link:hover {
  color: #fff;
}

.breadcrumb-separator {
  color: var(--color-surface-variant);
}

/* ── Blog Hero (Article Header) ────────────────────────────── */
.blog-header {
  margin-bottom: var(--space-6);
  text-align: center;
}

.blog-header .blog-title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.blog-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--fs-small);
  color: var(--color-on-surface-variant);
}

.blog-meta-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.blog-meta-icon {
  font-family: "Material Symbols Outlined";
  font-size: 1.1rem;
  color: var(--color-vibrant-orange);
}

.blog-featured-image {
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-8);
  border: 1px solid var(--color-border-glass);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

.blog-featured-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 16/9;
  object-fit: cover;
}

/* ── Table of Contents (Sticky Sidebar) ────────────────────── */
.blog-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-4));
  display: none;
}

@media (min-width: 1024px) {
  .blog-sidebar {
    display: block;
  }
}

.toc-card {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
}

.toc-title {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: #fff;
  border-bottom: 1px solid var(--color-border-glass);
  padding-bottom: 0.75rem;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toc-link {
  font-size: 0.9375rem;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: color var(--transition);
  display: block;
  line-height: 1.4;
}

.toc-link:hover, .toc-link.active {
  color: var(--color-vibrant-orange);
}

.toc-link.active {
  font-weight: 600;
}

.toc-list ul {
  padding-left: 1rem;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ── Article Content Typography & Elements ─────────────────── */
.article-content {
  font-size: 1.125rem;
  line-height: 1.8;
  color: #e2e2e8;
}

.article-content > * + * {
  margin-top: var(--space-4);
}

.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: var(--font-headline);
  color: #fff;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.article-content h2 {
  font-size: var(--fs-h2);
  border-bottom: 1px solid var(--color-border-glass);
  padding-bottom: 0.5rem;
}

.article-content h3 {
  font-size: var(--fs-h3);
}

.article-content p {
  margin-bottom: var(--space-3);
}

.article-content a:not(.btn) {
  color: var(--color-vibrant-orange);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(255, 165, 0, 0.4);
  transition: all var(--transition);
}

.article-content a:not(.btn):hover {
  text-decoration-color: var(--color-vibrant-orange);
}

.article-content img {
  border-radius: var(--radius-lg);
  margin: var(--space-5) 0;
  border: 1px solid var(--color-border-glass);
}

.article-content figcaption {
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--color-on-surface-variant);
  margin-top: -1rem;
  margin-bottom: var(--space-4);
  font-style: italic;
}

/* Lists */
.article-content ul,
.article-content ol {
  margin-left: var(--space-4);
  margin-bottom: var(--space-4);
}

.article-content ul {
  list-style-type: disc;
}

.article-content ol {
  list-style-type: decimal;
}

.article-content li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

.article-content li::marker {
  color: var(--color-vibrant-orange);
}

/* Quotes */
.article-content blockquote {
  position: relative;
  margin: var(--space-5) 0;
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--color-vibrant-orange);
  background: rgba(255, 165, 0, 0.05);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-size: 1.25rem;
  font-style: italic;
  color: #fff;
}

/* Callout Boxes */
.callout {
  margin: var(--space-5) 0;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border-left: 4px solid transparent;
  background: var(--color-surface-container-low);
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.callout-icon {
  font-family: "Material Symbols Outlined";
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.callout-content {
  flex: 1;
}

.callout-content p:last-child {
  margin-bottom: 0;
}

.callout--info {
  border-left-color: var(--color-tertiary);
  background: rgba(185, 215, 255, 0.05);
}
.callout--info .callout-icon {
  color: var(--color-tertiary);
}

.callout--warning {
  border-left-color: var(--color-vibrant-orange);
  background: rgba(255, 165, 0, 0.05);
}
.callout--warning .callout-icon {
  color: var(--color-vibrant-orange);
}

.callout--success {
  border-left-color: var(--color-vibrant-green);
  background: rgba(76, 175, 80, 0.05);
}
.callout--success .callout-icon {
  color: var(--color-vibrant-green);
}

/* FAQs */
.article-faq {
  margin-top: var(--space-6);
}

.article-faq details {
  background: var(--color-surface-container-low);
  border: 1px solid var(--color-border-glass);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  overflow: hidden;
}

.article-faq summary {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-headline);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  background: rgba(255,255,255,0.02);
}

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

.article-faq summary::after {
  content: 'expand_more';
  font-family: "Material Symbols Outlined";
  transition: transform var(--transition);
}

.article-faq details[open] summary::after {
  transform: rotate(180deg);
}

.article-faq .faq-answer {
  padding: 0 var(--space-4) var(--space-4) var(--space-4);
  color: var(--color-on-surface-variant);
}

/* ── Author Card ───────────────────────────────────────────── */
.author-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  margin: var(--space-8) 0;
  background: var(--color-surface-container-low);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-glass);
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid var(--color-vibrant-orange);
}

.author-info-wrap {
  flex: 1;
}

.author-name {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.author-bio {
  color: var(--color-on-surface-variant);
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* ── CTA Section (Premium eBook) ───────────────────────────── */
.blog-cta {
  position: relative;
  margin: var(--space-8) 0;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-vibrant-orange);
  background: linear-gradient(135deg, rgba(255, 165, 0, 0.1), rgba(17, 19, 23, 0.95));
  text-align: center;
  overflow: hidden;
}

.blog-cta::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 150px;
  height: 150px;
  background: rgba(255, 165, 0, 0.2);
  filter: blur(50px);
  border-radius: 50%;
  pointer-events: none;
}

.blog-cta-title {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  font-weight: 800;
  color: #fff;
  margin-bottom: var(--space-3);
}

.blog-cta-desc {
  font-size: 1.125rem;
  color: var(--color-on-surface-variant);
  max-width: 600px;
  margin: 0 auto var(--space-4);
}

.blog-cta-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.blog-cta-feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-glass);
}

.blog-cta-feature .material-icon {
  color: var(--color-vibrant-green);
  font-size: 1.1rem;
}

/* ── Blog Listing Grid (index.html) ────────────────────────── */
.blog-listing-header {
  text-align: center;
  margin-bottom: var(--space-8);
  padding-top: calc(var(--nav-height) + var(--space-8));
}

.blog-listing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-12);
}

.blog-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-surface-container-low);
  border: 1px solid var(--color-border-glass);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  height: 100%;
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 165, 0, 0.3);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.3);
}

.blog-card-image {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border-glass);
}

.blog-card-content {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xs);
  color: var(--color-vibrant-orange);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  letter-spacing: 0.05em;
}

.blog-card-title {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.blog-card-desc {
  color: var(--color-on-surface-variant);
  font-size: 0.9375rem;
  margin-bottom: var(--space-4);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border-glass);
  padding-top: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-on-surface-variant);
}

/* ── Reading Progress Bar ──────────────────────────────────── */
.reading-progress-container {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255,255,255,0.05);
  z-index: 90;
}

.reading-progress-bar {
  height: 100%;
  background: var(--color-vibrant-orange);
  width: 0%;
  transition: width 0.1s ease;
}

/* ── Scroll To Top ─────────────────────────────────────────── */
.scroll-top-btn {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-surface-container-high);
  border: 1px solid var(--color-border-glass);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 50;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.scroll-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background: var(--color-vibrant-orange);
  border-color: var(--color-vibrant-orange);
  transform: translateY(-3px);
}