/* ==========================================================================
   ARTICLE MARKDOWN TYPOGRAPHY & LAYOUT STYLES (E-INK FRIENDLY)
   ========================================================================== */

.post-layout-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3.5rem;
  align-items: start;
  margin-bottom: 5rem;
}

@media (max-width: 960px) {
  .post-layout-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .sidebar-column {
    position: relative;
    top: 0;
    height: auto;
    margin-bottom: 2rem;
  }

  .toc-sidebar {
    position: relative;
    top: 0;
  }
}

.markdown-body {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-family: var(--font-sans);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  scroll-margin-top: 6rem;
}

.markdown-body h1 { font-size: 2.25rem; }
.markdown-body h2 { font-size: 1.75rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
.markdown-body h3 { font-size: 1.4rem; }
.markdown-body h4 { font-size: 1.15rem; }

.markdown-body p {
  margin-bottom: 1.5rem;
}

.markdown-body strong {
  font-weight: 700;
  color: var(--text-primary);
}

.markdown-body em {
  font-style: italic;
}

.markdown-body a {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--text-muted);
  transition: all var(--transition-fast);
}

.markdown-body a:hover {
  color: var(--accent-hover);
  text-decoration-color: var(--accent-hover);
}

/* Lists */
.markdown-body ul,
.markdown-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

/* Blockquotes */
.markdown-body blockquote {
  margin: 2rem 0;
  padding: 1.25rem 1.75rem;
  border-left: 4px solid var(--text-primary);
  background: var(--bg-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.markdown-body blockquote p:last-child {
  margin-bottom: 0;
}

/* Code & Syntax Highlighting */
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-surface-hover);
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.markdown-body pre {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: #1c1917;
  color: #f5f2eb;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.markdown-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* Images & Captions */
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2rem 0 0.5rem;
  display: block;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.markdown-body figcaption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.markdown-body th,
.markdown-body td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.markdown-body th {
  background: var(--bg-surface-hover);
  font-weight: 700;
  color: var(--text-primary);
}

.markdown-body tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

/* Sidebar Right Column Container */
.sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  height: 100%;
}

/* Table of Contents (TOC) Sidebar Widget - Sticky Only */
.toc-sidebar {
  position: sticky;
  top: 6.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.toc-list li.toc-h3 {
  padding-left: 0.75rem;
  font-size: 0.85rem;
}

.toc-list li.toc-h4 {
  padding-left: 1.35rem;
  font-size: 0.82rem;
}

.toc-link {
  color: var(--text-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  display: block;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
  margin-left: -0.5rem;
}

.toc-link:hover, .toc-link.active {
  color: var(--text-primary);
  font-weight: 700;
  border-left-color: var(--text-primary);
}

/* Standalone Sidebar Author Card */
.sidebar-author-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.sidebar-author-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
}

.sidebar-author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
  filter: invert(1) brightness(2);
}

.sidebar-author-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.sidebar-author-bio {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 0.85rem;
}

.sidebar-author-link {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: underline;
  transition: opacity var(--transition-fast);
}

.sidebar-author-link:hover {
  opacity: 0.8;
}

@media (max-width: 600px) {
  .markdown-body {
    font-size: 1.05rem;
    line-height: 1.7;
  }

  .markdown-body h1 { font-size: 1.75rem; }
  .markdown-body h2 { font-size: 1.35rem; }
  .markdown-body h3 { font-size: 1.18rem; }

  .markdown-body blockquote {
    margin: 1.25rem 0;
    padding: 0.85rem 1rem;
  }

  .markdown-body pre {
    margin: 1.25rem 0;
    padding: 0.85rem 1rem;
    font-size: 0.85rem;
  }

  .markdown-body table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
    font-size: 0.85rem;
  }

  .markdown-body th,
  .markdown-body td {
    padding: 0.5rem 0.65rem;
  }

  .toc-sidebar {
    padding: 1rem;
  }

  .sidebar-author-card {
    padding: 1rem;
  }
}