// Article details and content styling

.reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: transparent;
  z-index: 1000;
  pointer-events: none;
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--accent-color);
  transition: width 0.1s cubic-bezier(0.25, 0.8, 0.25, 1);
}

// Post Detail
.post-detail {
  max-width: 800px;
  margin: 0 auto;
  padding-top: 4rem;
}

.post-header {
  margin-bottom: 4rem;
}

.post-title {
  margin-bottom: 1rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
}

.post-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.post-meta-label {
  font-style: normal;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-color);
  opacity: 0.8;
}

.post-meta-sep {
  color: var(--border-color);
  font-style: normal;
  user-select: none;
}

.post-meta-updated time {
  color: var(--text-muted);
}

// Heading anchor links
.post-body {
  h2,
  h3 {
    position: relative;

    .heading-anchor {
      display: inline-block;
      margin-left: 0.5em;
      color: var(--accent-color);
      font-family: var(--font-mono);
      font-weight: 400;
      font-size: 0.75em;
      opacity: 0;
      text-decoration: none;
      vertical-align: middle;
      transition: opacity 0.15s ease;
      user-select: none;
    }

    &:hover .heading-anchor {
      opacity: 1;
    }
  }
}

// ──────────────────────────────────────────
// Series Navigation Box
// ──────────────────────────────────────────
.series-nav {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-color);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.series-nav-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  margin-bottom: 1rem;
}

.series-nav-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-color);
  opacity: 0.8;
}

.series-nav-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--heading-color, var(--text-color));
  flex: 1;
}

.series-nav-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  padding: 0.1em 0.6em;
  white-space: nowrap;
}

.series-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.series-nav-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;

  &.is-current {
    .series-nav-index {
      color: var(--accent-color);
    }
    .series-nav-label {
      color: var(--text-color);
      font-weight: 600;
    }
  }
}

.series-nav-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.6;
  flex-shrink: 0;
  width: 1.5ch;
  text-align: right;
}

.series-nav-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;

  &:hover {
    color: var(--accent-color);
  }
}

.post-toc {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  margin-bottom: 3rem;

  summary {
    font-weight: 600;
    cursor: pointer;
    list-style: none; /* Hide default arrow */
    display: flex;
    align-items: center;
    gap: 0.5rem;

    &::before {
      content: '↓';
      color: var(--accent-color);
      transition: transform 0.2s ease;
    }
  }

  &[open] summary::before {
    transform: rotate(180deg);
  }

  ul {
    margin-top: 1rem;
    margin-bottom: 0;
    list-style-type: none;
    padding-left: 1rem;
  }

  li {
    margin-bottom: 0.5rem;
  }

  a {
    color: var(--text-muted);
    font-size: 0.95em;
    &:hover {
      color: var(--accent-color);
    }
  }
}

.post-tags-share {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 4rem;

  @media (min-width: 640px) {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.social-share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;

  .share-label {
    font-weight: 500;
    color: var(--text-color);
    margin-right: 0.25rem;
  }

  .share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: var(--transition-smooth);
    cursor: pointer;

    &:hover {
      color: var(--bg-color);
      transform: translateY(-2px);
      border-color: transparent;

      &.x {
        background: #000000;
        color: #ffffff;
      }
      &.bluesky {
        background: #0285ff;
      }
      &.linkedin {
        background: #0077b5;
      }
      &.reddit {
        background: #ff4500;
      }
      &.hackernews {
        background: #ff6600;
      }
      &.email {
        background: #6b7280;
      }
    }
  }
}

.post-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-items: center;
  text-align: center;
  max-width: 34ch;
}

.post-nav-label {
  color: var(--accent-color);
  font-size: 0.9rem;
  font-weight: 500;
}

.post-nav-title {
  font-size: 1rem;
  line-height: 1.35;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.post-nav-link:hover .post-nav-title,
.post-nav-link:hover .post-nav-label {
  color: var(--accent-color);
}

@media (max-width: 640px) {
  .post-nav-title {
    font-size: 0.95rem;
  }
}

@media (min-width: 900px) {
  .post-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
    align-items: start;
  }

  .post-nav-prev {
    justify-self: start;
    align-items: flex-start;
    text-align: left;
  }

  .post-nav-next {
    justify-self: end;
    align-items: flex-end;
    text-align: right;
  }
}

// ──────────────────────────────────────────
// Sidebar TOC Layout
// ──────────────────────────────────────────

.post-layout {
  display: contents;

  @media (min-width: 1200px) {
    display: grid;
    grid-template-columns: minmax(0, 800px) 240px;
    gap: 3rem;
    align-items: start;
    max-width: 1100px;
    margin: 0 auto;
  }
}

@media (min-width: 1200px) {
  .post-detail {
    max-width: none;
    margin: 0;
  }

  // Hide inline TOC — sidebar takes over
  .post-toc {
    display: none !important;
  }
}

.post-toc-sidebar {
  display: none;

  @media (min-width: 1200px) {
    display: block;
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    padding-top: 4rem; // align with article content start
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;

    &::-webkit-scrollbar {
      width: 4px;
    }
    &::-webkit-scrollbar-track {
      background: transparent;
    }
    &::-webkit-scrollbar-thumb {
      background: var(--border-color);
    }
  }
}

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

    // Nested level (h2 children)
    ul {
      padding-left: 1rem;
      margin-top: 0.25rem;
    }
  }

  li {
    margin-bottom: 0.35rem;
  }

  a {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.4;
    padding: 0.2rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    transition:
      color 0.2s ease,
      border-color 0.2s ease;
    text-decoration: none;

    &:hover {
      color: var(--accent-color);
    }

    &.toc-active {
      color: var(--accent-color);
      border-left-color: var(--accent-color);
    }
  }
}

.toc-sidebar-title {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 0 0 1rem 0;
  padding-left: 0.75rem;
}

// ──────────────────────────────────────────
// Media Wrappers (YouTube, etc)
// ──────────────────────────────────────────
.youtube-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--border-color);
  margin: 2rem 0;
  background: #000;

  iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
  }
}

// ──────────────────────────────────────────
// Callouts / Admonitions
// ──────────────────────────────────────────
.callout {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--callout-color, var(--border-color));
  background: var(--surface-color);
  color: var(--text-color);
  font-size: 0.95rem;
  line-height: 1.6;

  .callout-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--callout-color, var(--heading-color));
  }

  .callout-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
  }

  .callout-title {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
  }

  .callout-content {
    > :first-child {
      margin-top: 0;
    }
    > :last-child {
      margin-bottom: 0;
    }
  }

  // Variants
  &.callout-note {
    --callout-color: #3b82f6; // Blue
    background: rgba(59, 130, 246, 0.05);
  }

  &.callout-warning {
    --callout-color: #f59e0b; // Amber
    background: rgba(245, 158, 11, 0.05);
  }

  &.callout-tip {
    --callout-color: #16a34a; // Green
    background: rgba(22, 163, 74, 0.05);
  }

  &.callout-danger {
    --callout-color: #ef4444; // Red
    background: rgba(239, 68, 68, 0.05);
  }
}

.comments {
  margin-top: 4rem;
}

// ──────────────────────────────────────────
// Related Posts
// ──────────────────────────────────────────
.related-posts-section {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);

  h3 {
    margin-bottom: 2rem;
    font-size: 1.5rem;
    color: var(--heading-color);
    letter-spacing: -0.02em;
  }

  .related-posts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;

    @media (min-width: 768px) {
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2.5rem;
    }

    // Override some constraints from feed-page cards when inside the grid
    .feed-item {
      border-bottom: none !important;
      padding-bottom: 0 !important;
      background: var(--surface-color);
      border: 1px solid var(--border-color);
      padding: 1.5rem !important;
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: var(--transition-smooth);

      &:hover {
        border-color: var(--accent-color);
      }

      .item-snippet {
        flex: 1;
      }
    }
  }
}