/* ===== KNOWLEDGE BASE STYLES ===== */
/* Editorial minimalism: New Yorker meets Apple */

/* ===== COLOR SYSTEM ===== */
/* Default for knowledge archive page */
body.knowledge {
  --page-accent: var(--accent-gold);
}

/* Category-based accent colors (higher specificity to override default) */
body.knowledge.post-research,
body[data-category="research"] {
  --page-accent: var(--accent-wine);
}

body.knowledge.post-music,
body[data-category="music"] {
  --page-accent: var(--accent-sage);
}

body.knowledge.post-tech,
body[data-category="tech"] {
  --page-accent: var(--accent-steel);
}

/* ===== ARCHIVE PAGE STYLES ===== */

/* Header Section */
.knowledge-header {
  max-width: 900px;
  margin: 0 auto;
  padding: 8rem 2rem 4rem;
  text-align: center;
}

.knowledge-header h1 {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--page-accent);
}

.knowledge-header .page-subtitle {
  font-size: 1.5rem;
  opacity: 0.9;
  color: var(--text-primary);
}

/* Filter Section */
.filter-section {
  max-width: 900px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
}

.filter-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.filter-btn {
  background: rgba(232, 232, 232, 0.05);
  border: 1px solid rgba(232, 232, 232, 0.2);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.filter-btn:hover {
  background: rgba(232, 232, 232, 0.1);
  border-color: rgba(232, 232, 232, 0.3);
  transform: translateY(-2px);
}

.filter-btn:focus {
  outline: 2px solid var(--page-accent);
  outline-offset: 2px;
}

.filter-btn.active {
  background: var(--page-accent);
  color: var(--bg-primary);
  border-color: var(--page-accent);
}

/* Posts Container */
.posts-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* Post Cards */
.post-card {
  background: rgba(232, 232, 232, 0.02);
  border: 1px solid rgba(232, 232, 232, 0.1);
  border-left: 4px solid;
  border-radius: 4px;
  transition: all 0.3s ease;
  animation: fadeIn 0.5s ease-in-out;
}

.post-card[data-category="research"] {
  border-left-color: var(--accent-wine);
}

.post-card[data-category="music"] {
  border-left-color: var(--accent-sage);
}

.post-card[data-category="tech"] {
  border-left-color: var(--accent-steel);
}

.post-card:hover {
  background: rgba(232, 232, 232, 0.04);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.post-card-link {
  display: block;
  padding: 2.5rem;
  text-decoration: none;
  color: inherit;
}

.post-card-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Category Labels */
.post-category {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-icon {
  font-size: 1rem;
  line-height: 1;
}

.post-card[data-category="research"] .category-icon {
  color: var(--accent-wine);
}

.post-card[data-category="music"] .category-icon {
  color: var(--accent-sage);
}

.post-card[data-category="tech"] .category-icon {
  color: var(--accent-steel);
}

.category-label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.8;
}

/* Post Title */
.post-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin: 0;
  transition: color 0.3s ease;
}

.post-card:hover .post-title {
  color: var(--page-accent);
}

/* Post Excerpt */
.post-excerpt {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-primary);
  opacity: 0.9;
  margin: 0;
}

/* Post Meta */
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  opacity: 0.7;
  margin-top: 0.5rem;
}

/* Fade-in animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== POST TEMPLATE STYLES ===== */

/* Post Header */
.post-header {
  max-width: 800px;
  margin: 0 auto;
  padding: 8rem 2rem 4rem;
  text-align: center;
}

.post-breadcrumb {
  margin-bottom: 2rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  opacity: 0.8;
  text-decoration: none;
  transition: all 0.3s ease;
}

.back-link:hover {
  opacity: 1;
  color: var(--page-accent);
  transform: translateX(-4px);
}

.back-link:focus {
  outline: 2px solid var(--page-accent);
  outline-offset: 4px;
}

.post-category-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.post-category-header .category-icon {
  font-size: 1.2rem;
  color: var(--page-accent);
}

.post-category-header .category-label {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--page-accent);
}

.post-title-main {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--page-accent);
}

.post-subtitle {
  font-family: var(--font-body);
  font-size: 1.5rem;
  line-height: 1.4;
  color: var(--text-primary);
  opacity: 0.9;
  margin-bottom: 2rem;
}

.post-byline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  opacity: 0.7;
}

/* Hero Image */
.post-hero-image {
  max-width: 1000px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
}

.post-hero-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
}

/* Post Content Area */
.post-content {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

/* Typography Hierarchy */
.post-content .lead-paragraph {
  font-size: 1.2rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.post-content p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.post-content h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  color: var(--page-accent);
}

.post-content h3 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--page-accent);
}

.post-content h4 {
  font-family: var(--font-body);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

/* Links */
.post-content a {
  color: var(--page-accent);
  text-decoration: underline;
  text-decoration-color: rgba(232, 232, 232, 0.3);
  text-underline-offset: 3px;
  transition: all 0.3s ease;
}

.post-content a:hover {
  text-decoration-color: var(--page-accent);
}

.post-content a:focus {
  outline: 2px solid var(--page-accent);
  outline-offset: 2px;
}

/* Lists */
.post-content ul,
.post-content ol {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.post-content li {
  margin-bottom: 0.75rem;
}

.post-content ul li::marker {
  color: var(--page-accent);
}

.post-content ol li::marker {
  color: var(--page-accent);
  font-weight: 600;
}

/* Blockquotes */
.post-content blockquote {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-style: italic;
  line-height: 1.6;
  text-align: center;
  margin: 3rem auto;
  padding: 2rem;
  border-left: 4px solid var(--page-accent);
  max-width: 600px;
  color: var(--page-accent);
  background: rgba(232, 232, 232, 0.02);
}

/* Code Blocks */
.post-content pre {
  background: rgba(232, 232, 232, 0.05);
  border: 1px solid rgba(232, 232, 232, 0.1);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  overflow-x: auto;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.post-content code {
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.post-content p code {
  background: rgba(232, 232, 232, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
}

/* Images */
.post-content img {
  width: 100%;
  max-width: 1000px;
  height: auto;
  margin: 3rem auto;
  display: block;
  border-radius: 8px;
}

/* Image Galleries */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.image-gallery img {
  width: 100%;
  height: auto;
  margin: 0;
  border-radius: 8px;
  object-fit: cover;
  aspect-ratio: 16/9;
}

/* Audio Embeds */
.audio-embed {
  max-width: 680px;
  margin: 3rem auto;
  text-align: center;
}

.audio-embed iframe {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.bandcamp-embed {
  border: 0;
  width: 100%;
  height: 120px;
}

.audio-caption {
  font-family: var(--font-body);
  font-size: 0.9rem;
  opacity: 0.7;
  font-style: italic;
}

/* Content Notes */
.content-note {
  background: rgba(232, 232, 232, 0.03);
  border-left: 4px solid var(--page-accent);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 4px;
}

.content-note h4 {
  margin-top: 0;
  color: var(--page-accent);
}

.content-note p {
  margin-bottom: 0;
  font-size: 1rem;
}

/* Post Footer Note */
.post-footer-note {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(232, 232, 232, 0.1);
}

.post-footer-note p {
  font-size: 1rem;
  opacity: 0.8;
}

/* Related Posts Section */
.related-posts {
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
  border-top: 1px solid rgba(232, 232, 232, 0.1);
}

.related-posts h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.related-post-card {
  background: rgba(232, 232, 232, 0.02);
  border: 1px solid rgba(232, 232, 232, 0.1);
  border-left: 4px solid;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.related-post-card[data-category="research"] {
  border-left-color: var(--accent-wine);
}

.related-post-card[data-category="music"] {
  border-left-color: var(--accent-sage);
}

.related-post-card[data-category="tech"] {
  border-left-color: var(--accent-steel);
}

.related-post-card:hover {
  background: rgba(232, 232, 232, 0.04);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.related-post-link {
  display: block;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
}

.related-post-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.3;
  margin: 1rem 0;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.related-post-card:hover .related-post-title {
  color: var(--page-accent);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet (768-1023px) */
@media (max-width: 1023px) {
  .knowledge-header h1 {
    font-size: 3rem;
  }

  .post-title-main {
    font-size: 3rem;
  }

  .post-content h2 {
    font-size: 2rem;
  }

  .post-content h3 {
    font-size: 1.5rem;
  }

  .related-posts-grid {
    grid-template-columns: 1fr;
  }
}

/* Mobile (<768px) */
@media (max-width: 767px) {
  .knowledge-header {
    padding: 6rem 1.5rem 3rem;
  }

  .knowledge-header h1 {
    font-size: 2.5rem;
  }

  .knowledge-header .page-subtitle {
    font-size: 1.2rem;
  }

  .filter-section {
    padding: 0 1.5rem;
    margin-bottom: 3rem;
  }

  .filter-buttons {
    gap: 0.75rem;
  }

  .filter-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
  }

  .posts-container {
    padding: 0 1.5rem 4rem;
  }

  .posts-grid {
    gap: 2rem;
  }

  .post-card-link {
    padding: 1.5rem;
  }

  .post-title {
    font-size: 1.5rem;
  }

  .post-excerpt {
    font-size: 1rem;
  }

  /* Post Template Mobile */
  .post-header {
    padding: 6rem 1.5rem 3rem;
  }

  .post-title-main {
    font-size: 2.5rem;
  }

  .post-subtitle {
    font-size: 1.2rem;
  }

  .post-byline {
    flex-wrap: wrap;
    font-size: 0.85rem;
  }

  .post-content {
    padding: 0 1.5rem 4rem;
  }

  .post-content .lead-paragraph {
    font-size: 1.1rem;
  }

  .post-content p {
    font-size: 1rem;
  }

  .post-content h2 {
    font-size: 1.8rem;
    margin-top: 2.5rem;
  }

  .post-content h3 {
    font-size: 1.4rem;
    margin-top: 2rem;
  }

  .post-content blockquote {
    font-size: 1.2rem;
    padding: 1.5rem;
    margin: 2rem auto;
  }

  .post-content pre {
    padding: 1rem;
    font-size: 0.85rem;
    margin: 1.5rem -1.5rem;
    border-radius: 0;
  }

  .image-gallery {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .related-posts {
    padding: 3rem 1.5rem 4rem;
  }

  .related-posts h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
  }

  .related-post-link {
    padding: 1.5rem;
  }

  .related-post-title {
    font-size: 1.2rem;
  }
}

/* Very small mobile (<480px) */
@media (max-width: 479px) {
  .filter-buttons {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding-bottom: 0.5rem;
  }

  .filter-btn {
    flex-shrink: 0;
  }
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */

/* Focus states */
.post-card:focus-within {
  outline: 2px solid var(--page-accent);
  outline-offset: 4px;
}

.related-post-card:focus-within {
  outline: 2px solid var(--page-accent);
  outline-offset: 4px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .post-card,
  .related-post-card,
  .filter-btn,
  .back-link {
    transition: none;
  }

  @keyframes fadeIn {
    from, to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .post-card,
  .related-post-card {
    border-width: 2px;
  }

  .filter-btn {
    border-width: 2px;
  }

  .post-content a {
    text-decoration-thickness: 2px;
  }
}

/* ===== ARTICLE ENHANCEMENTS ===== */

/* Reading Progress Bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(232, 232, 232, 0.1);
  z-index: 9999;
}

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

/* Table of Contents */
.article-toc {
  background: rgba(232, 232, 232, 0.03);
  border: 1px solid rgba(232, 232, 232, 0.1);
  border-left: 4px solid var(--page-accent);
  border-radius: 4px;
  padding: 1.5rem;
  margin-bottom: 3rem;
}

.article-toc h3 {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 1rem 0;
  color: var(--page-accent);
}

.article-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-toc li {
  margin-bottom: 0.5rem;
}

.article-toc a {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-primary);
  text-decoration: none;
  opacity: 0.8;
  transition: all 0.3s ease;
  display: block;
  padding: 0.25rem 0;
}

.article-toc a:hover,
.article-toc a.active {
  opacity: 1;
  color: var(--page-accent);
  transform: translateX(4px);
}

/* Social Share Buttons */
.share-buttons {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(232, 232, 232, 0.1);
  text-align: center;
}

.share-buttons h3 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
  color: var(--page-accent);
}

.share-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.share-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: rgba(232, 232, 232, 0.05);
  border: 1px solid rgba(232, 232, 232, 0.2);
  border-radius: 4px;
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.share-link:hover {
  background: var(--page-accent);
  color: var(--bg-primary);
  border-color: var(--page-accent);
  transform: translateY(-2px);
}

.share-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Article Navigation (Prev/Next) */
.article-navigation {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(232, 232, 232, 0.1);
}

.nav-prev,
.nav-next {
  flex: 1;
  padding: 1.5rem;
  background: rgba(232, 232, 232, 0.02);
  border: 1px solid rgba(232, 232, 232, 0.1);
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-prev {
  text-align: left;
}

.nav-next {
  text-align: right;
}

.nav-prev:hover,
.nav-next:hover {
  background: rgba(232, 232, 232, 0.04);
  border-color: var(--page-accent);
  transform: translateY(-2px);
}

.nav-label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--page-accent);
  opacity: 0.8;
}

.nav-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Release Card Link (for music.html album cards) */
.release-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* Mobile adjustments for new features */
@media (max-width: 767px) {
  .article-navigation {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-next {
    text-align: left;
  }

  .share-links {
    flex-direction: column;
    align-items: stretch;
  }

  .share-link {
    justify-content: center;
  }
}