/* ===================================
 * Post Content Styles
 * Article Typography & Elements
 * =================================== */

.post-content {
  font: var(--md-sys-typescale-body-large);
  color: var(--md-sys-color-on-surface);
  line-height: 1.8;
}

/* ===================================
 * Headings in Post
 * =================================== */
.post-content h1,
.post-content h2,
.post-content h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.post-content h1 {
  font-size: 34px;
  line-height: 1.25;
  margin-top: 2em;
  margin-bottom: 0.5em;
}

.post-content h2 {
  font-size: 28px;
  line-height: 1.3;
  margin-top: 1.75em;
  margin-bottom: 0.5em;
}

.post-content h3 {
  font-size: 23px;
  line-height: 1.35;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.post-content h4 {
  font: var(--md-sys-typescale-title-large);
  margin-top: 1.25em;
  margin-bottom: 0.5em;
}

.post-content h5 {
  font: var(--md-sys-typescale-title-medium);
  margin-top: 1em;
  margin-bottom: 0.5em;
}

.post-content h6 {
  font: var(--md-sys-typescale-title-small);
  color: var(--md-sys-color-on-surface-variant);
  margin-top: 1em;
  margin-bottom: 0.5em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* First heading should not have top margin */
.post-content > h1:first-child,
.post-content > h2:first-child,
.post-content > h3:first-child,
.post-content > h4:first-child {
  margin-top: 0;
}

/* Heading anchors */
.post-content h1[id],
.post-content h2[id],
.post-content h3[id],
.post-content h4[id],
.post-content h5[id],
.post-content h6[id] {
  scroll-margin-top: calc(var(--blog-header-height) + 24px);
}

.post-content h1[id]::before,
.post-content h2[id]::before,
.post-content h3[id]::before,
.post-content h4[id]::before,
.post-content h5[id]::before,
.post-content h6[id]::before {
  content: '#';
  color: var(--md-sys-color-primary);
  opacity: 0;
  margin-left: -1em;
  width: 1em;
  display: inline-block;
  transition: opacity var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-content h1[id]:hover::before,
.post-content h2[id]:hover::before,
.post-content h3[id]:hover::before,
.post-content h4[id]:hover::before,
.post-content h5[id]:hover::before,
.post-content h6[id]:hover::before {
  opacity: 0.5;
}

/* ===================================
 * Paragraphs & Text
 * =================================== */
.post-content p {
  margin-bottom: 1em;
}

.post-content strong {
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
}

.post-content em {
  font-style: italic;
}

/* ===================================
 * Links in Post
 * =================================== */
.post-content a {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-content a:hover {
  color: var(--md-sys-color-on-primary-container);
  text-decoration-thickness: 2px;
}

/* ===================================
 * Lists in Post
 * =================================== */
.post-content ul,
.post-content ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.post-content li {
  margin-bottom: 0.25em;
  line-height: 1.75;
}

.post-content li > ul,
.post-content li > ol {
  margin-top: 0.25em;
  margin-bottom: 0;
}

.post-content ul li::marker {
  color: var(--md-sys-color-primary);
}

.post-content ol li::marker {
  color: var(--md-sys-color-primary);
  font-weight: 500;
}

/* Task list (checkbox) */
.post-content ul.task-list {
  list-style: none;
  padding-left: 0;
}

.post-content li.task-list-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.post-content li.task-list-item input[type="checkbox"] {
  accent-color: var(--md-sys-color-primary);
  width: 16px;
  height: 16px;
  margin: 0;
  flex-shrink: 0;
}

/* ===================================
 * Blockquotes
 * =================================== */
.post-content blockquote {
  background: var(--md-sys-color-surface-container);
  border-left: 4px solid var(--md-sys-color-primary);
  border-radius: 0 var(--md-sys-shape-corner-medium) var(--md-sys-shape-corner-medium) 0;
  padding: 1em 1.25em;
  margin: 1.5em 0;
  color: var(--md-sys-color-on-surface-variant);
}

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

.post-content blockquote blockquote {
  margin-top: 0.5em;
  margin-bottom: 0;
  background: var(--md-sys-color-surface-container-high);
}

/* ===================================
 * Code
 * =================================== */
.post-content code {
  font-family: var(--md-sys-typescale-font-family-mono);
  font-size: 0.875em;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface-variant);
  padding: 0.2em 0.4em;
  border-radius: var(--md-sys-shape-corner-small);
  font-feature-settings: "liga" 0;
}

.post-content pre {
  position: relative;
  background: var(--md-sys-color-surface-container-lowest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  margin: 1.5em 0;
  overflow: hidden;
}

.post-content pre code {
  display: block;
  padding: 1.25em 1em;
  overflow-x: auto;
  line-height: 1.6;
  background: none;
  /* color is managed by highlight.js theme — do NOT override here */
  font-size: 0.875em;
  font-family: var(--md-sys-typescale-font-family-mono);
  tab-size: 2;
}

/* Fallback for code blocks without hljs */
.post-content pre code:not([class*="language-"]):not(.hljs) {
  color: var(--md-sys-color-on-surface);
}
/* Code block language label */
.post-content pre[data-language]::before {
  content: attr(data-language);
  position: absolute;
  top: 0;
  right: 0;
  padding: 4px 12px;
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font: 500 var(--md-sys-typescale-label-small);
  border-radius: 0 var(--md-sys-shape-corner-medium) 0 var(--md-sys-shape-corner-small);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  z-index: 1;
}

/* Copy code button */
.post-content pre .copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 32px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-small);
  border: none;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.6;
  transition: opacity var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
  z-index: 2;
}

.post-content pre:hover .copy-code-btn {
  opacity: 1;
}

.post-content pre .copy-code-btn:hover {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  opacity: 1;
}

.post-content pre .copy-code-btn.copied {
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  opacity: 1;
}

.post-content pre[data-language] .copy-code-btn {
  top: 36px;
}

/* Line numbers */
.post-content pre .line-numbers {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3em;
  padding: 1em 0;
  background: var(--md-sys-color-surface-container);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  text-align: right;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.875em;
  line-height: 1.5;
  user-select: none;
}

.post-content pre .line-numbers span {
  display: block;
  padding-right: 0.5em;
}

.post-content pre.has-line-numbers code {
  padding-left: 4em;
}

/* Highlighted line */
.post-content pre .highlight-line {
  background: color-mix(in srgb, var(--md-sys-color-primary) 12%, transparent);
  display: block;
  margin: 0 -1em;
  padding: 0 1em;
}

/* Inline code in headings */
.post-content h1 code,
.post-content h2 code,
.post-content h3 code,
.post-content h4 code,
.post-content h5 code,
.post-content h6 code {
  font-size: 0.85em;
  background: var(--md-sys-color-surface-container);
}

/* ===================================
 * Tables in Post
 * =================================== */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font: var(--md-sys-typescale-body-medium);
  border-radius: var(--md-sys-shape-corner-medium);
  overflow: hidden;
}

.post-content thead {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.post-content th {
  font-weight: 500;
  text-align: left;
  padding: 0.75em 1em;
}

.post-content td {
  padding: 0.75em 1em;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.post-content tbody tr:nth-child(even) {
  background: var(--md-sys-color-surface-container-low);
}

.post-content tbody tr:hover {
  background: var(--md-sys-color-surface-container);
}

/* ===================================
 * Images in Post
 * =================================== */
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--md-sys-shape-corner-medium);
  display: block;
  margin: 1.5em auto;
}

.post-content img[alt*="center"] {
  margin-left: auto;
  margin-right: auto;
}

/* Image with caption */
.post-content figure {
  margin: 1.5em 0;
  text-align: center;
}

.post-content figcaption {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
  margin-top: 0.5em;
}

/* ===================================
 * Horizontal Rule
 * =================================== */
.post-content hr {
  border: none;
  height: 1px;
  background: var(--md-sys-color-outline-variant);
  margin: 2em 0;
}

/* ===================================
 * Keyboard
 * =================================== */
.post-content kbd {
  font-family: var(--md-sys-typescale-font-family-mono);
  font-size: 0.875em;
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-small);
  padding: 0.2em 0.5em;
  box-shadow: 0 2px 0 var(--md-sys-color-outline-variant);
}

/* ===================================
 * Mark / Highlight
 * =================================== */
.post-content mark {
  background: var(--md-sys-color-tertiary-container);
  color: var(--md-sys-color-on-tertiary-container);
  padding: 0.1em 0.3em;
  border-radius: var(--md-sys-shape-corner-extra-small);
}

/* ===================================
 * Details / Summary
 * =================================== */
.post-content details {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 1em;
  margin: 1em 0;
}

.post-content details[open] {
  background: var(--md-sys-color-surface-container-low);
}

.post-content summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--md-sys-color-primary);
  padding: 0.5em 0;
  user-select: none;
}

.post-content summary:hover {
  color: var(--md-sys-color-on-primary-container);
}

/* ===================================
 * Footnotes
 * =================================== */
.post-content .footnotes {
  margin-top: 3em;
  padding-top: 1em;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

.post-content .footnote-ref {
  font-size: 0.75em;
  vertical-align: super;
}

.post-content .footnote-backref {
  text-decoration: none;
}

/* ===================================
 * Math (KaTeX)
 * =================================== */
.post-content .katex {
  font-size: 1.1em;
}

.post-content .katex-display {
  margin: 1.5em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5em 0;
}

/* ===================================
 * Alert / Admonition (if supported)
 * =================================== */
.post-content .alert {
  padding: 1em 1.25em;
  border-radius: var(--md-sys-shape-corner-medium);
  margin: 1.5em 0;
  border-left: 4px solid;
}

.post-content .alert-info {
  background: color-mix(in srgb, var(--md-sys-color-primary-container) 50%, transparent);
  border-color: var(--md-sys-color-primary);
}

.post-content .alert-warning {
  background: color-mix(in srgb, var(--md-sys-color-tertiary-container) 50%, transparent);
  border-color: var(--md-sys-color-tertiary);
}

.post-content .alert-danger {
  background: color-mix(in srgb, var(--md-sys-color-error-container) 50%, transparent);
  border-color: var(--md-sys-color-error);
}

.post-content .alert-success {
  background: color-mix(in srgb, var(--md-sys-color-secondary-container) 50%, transparent);
  border-color: var(--md-sys-color-secondary);
}

/* ===================================
 * Callout Blocks — Theme-level Components
 * Usage in markdown:
 *   <div class="callout callout-info">内容</div>
 *   <div class="callout callout-tip">内容</div>
 *   <div class="callout callout-warning">内容</div>
 *   <div class="callout callout-danger">内容</div>
 *   <div class="callout callout-note">内容</div>
 *   <div class="callout callout-success">内容</div>
 *
 * With title:
 *   <div class="callout callout-info">
 *     <div class="callout-title">标题</div>
 *     <div class="callout-content">内容</div>
 *   </div>
 * =================================== */
.post-content .callout {
  position: relative;
  padding: 1em 1.25em;
  margin: 1.5em 0;
  border-radius: var(--md-sys-shape-corner-medium);
  border-left: 4px solid;
  line-height: 1.7;
}

.post-content .callout p {
  margin: 0.5em 0;
}

.post-content .callout p:first-child {
  margin-top: 0;
}

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

.post-content .callout-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.95em;
  margin-bottom: 0.5em;
}

.post-content .callout-title::before {
  font-family: 'Material Symbols Rounded';
  font-size: 20px;
  line-height: 1;
}

/* Info */
.post-content .callout-info {
  background: color-mix(in srgb, var(--md-sys-color-primary-container) 40%, var(--md-sys-color-surface-container-low) 60%);
  border-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-info .callout-title {
  color: var(--md-sys-color-primary);
}

.post-content .callout-info .callout-title::before {
  content: 'info';
  color: var(--md-sys-color-primary);
}

/* Tip */
.post-content .callout-tip {
  background: color-mix(in srgb, var(--md-sys-color-secondary-container) 40%, var(--md-sys-color-surface-container-low) 60%);
  border-color: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-tip .callout-title {
  color: var(--md-sys-color-secondary);
}

.post-content .callout-tip .callout-title::before {
  content: 'lightbulb';
  color: var(--md-sys-color-secondary);
}

/* Note */
.post-content .callout-note {
  background: color-mix(in srgb, var(--md-sys-color-surface-container) 60%, var(--md-sys-color-surface-container-low) 40%);
  border-color: var(--md-sys-color-outline);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-note .callout-title {
  color: var(--md-sys-color-on-surface-variant);
}

.post-content .callout-note .callout-title::before {
  content: 'edit_note';
  color: var(--md-sys-color-on-surface-variant);
}

/* Warning */
.post-content .callout-warning {
  background: color-mix(in srgb, var(--md-sys-color-tertiary-container) 40%, var(--md-sys-color-surface-container-low) 60%);
  border-color: var(--md-sys-color-tertiary);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-warning .callout-title {
  color: var(--md-sys-color-tertiary);
}

.post-content .callout-warning .callout-title::before {
  content: 'warning';
  color: var(--md-sys-color-tertiary);
}

/* Danger */
.post-content .callout-danger {
  background: color-mix(in srgb, var(--md-sys-color-error-container) 40%, var(--md-sys-color-surface-container-low) 60%);
  border-color: var(--md-sys-color-error);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-danger .callout-title {
  color: var(--md-sys-color-error);
}

.post-content .callout-danger .callout-title::before {
  content: 'error';
  color: var(--md-sys-color-error);
}

/* Success */
.post-content .callout-success {
  background: color-mix(in srgb, var(--md-sys-color-secondary-container) 40%, var(--md-sys-color-surface-container-low) 60%);
  border-color: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-surface);
}

.post-content .callout-success .callout-title {
  color: var(--md-sys-color-on-secondary-container);
}

.post-content .callout-success .callout-title::before {
  content: 'check_circle';
  color: var(--md-sys-color-secondary);
}

/* Centered callout content */
.post-content .callout-center {
  text-align: center;
}

.post-content .callout-center .callout-title {
  justify-content: center;
}

/* ===================================
 * Album Grid (for resource posts)
 * Usage in markdown:
 *   <div class="album-grid">
 *     <div class="album-item">
 *       <img src="cover.jpg" alt="album">
 *       <span>Album Name</span>
 *     </div>
 *   </div>
 * =================================== */
.post-content .album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin: 1.5em 0;
}

.post-content .album-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px;
  background: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-medium);
  border: 1px solid var(--md-sys-color-outline-variant);
  text-align: center;
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              transform var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-content .album-item:hover {
  background: var(--md-sys-color-surface-container);
  transform: translateY(-2px);
}

.post-content .album-item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--md-sys-shape-corner-small);
  margin: 0;
}

.post-content .album-item span {
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-on-surface);
  line-height: 1.4;
}

/* Back to top link in posts */
.post-content .back-top {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-primary);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: var(--md-sys-shape-corner-small);
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-content .back-top:hover {
  background: color-mix(in srgb, var(--md-sys-color-primary) 10%, transparent);
  text-decoration: none;
}

/* ===================================
 * Post Tags
 * =================================== */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

.post-tags .md-chip {
  height: 28px;
  font-size: 0.8125em;
}

/* ===================================
 * Post Navigation (Previous/Next)
 * =================================== */
.post-nav {
  display: flex;
  gap: 16px;
  margin-top: 40px;
}

.post-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  text-decoration: none;
  transition: border-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-nav__item:hover {
  border-color: var(--md-sys-color-primary);
  background: var(--md-sys-color-surface-container-low);
  text-decoration: none;
}

.post-nav__label {
  font: var(--md-sys-typescale-label-small);
  color: var(--md-sys-color-on-surface-variant);
}

.post-nav__title {
  font: var(--md-sys-typescale-title-small);
  color: var(--md-sys-color-primary);
}

.post-nav__item--prev {
  text-align: left;
}

.post-nav__item--next {
  text-align: right;
}

/* ===================================
 * Post Share Buttons
 * =================================== */
.post-share {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.post-share__label {
  display: flex;
  align-items: center;
  gap: 6px;
  font: var(--md-sys-typescale-label-large);
  color: var(--md-sys-color-on-surface-variant);
  flex-shrink: 0;
}

.post-share__label .md-icon {
  font-size: 18px;
  color: var(--md-sys-color-primary);
}

.post-share__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.post-share__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 14px;
  border-radius: var(--md-sys-shape-corner-full);
  border: 1px solid var(--md-sys-color-outline);
  background: transparent;
  color: var(--md-sys-color-on-surface-variant);
  font: var(--md-sys-typescale-label-large);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              border-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-share__btn:hover {
  background: var(--md-sys-color-primary-container);
  border-color: transparent;
  color: var(--md-sys-color-on-primary-container);
  text-decoration: none;
}

.post-share__btn .md-icon {
  font-size: 16px;
}

.post-share__btn i {
  font-size: 16px;
  width: 16px;
  text-align: center;
}

/* ===================================
 * Post Author Card
 * =================================== */
.post-author {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
  padding: 20px;
  background: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-large);
}

.post-author__avatar-wrap {
  flex-shrink: 0;
}

.post-author__avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--md-sys-shape-corner-full);
  object-fit: cover;
}

.post-author__info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.post-author__byline {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.post-author__label {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

.post-author__name {
  font: 600 var(--md-sys-typescale-title-medium);
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

.post-author__name:hover {
  text-decoration: underline;
}

.post-author__bio {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
  margin: 4px 0 0;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===================================
 * Related Posts
 * =================================== */
.post-related {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

.post-related__title {
  font: var(--md-sys-typescale-title-medium);
  color: var(--md-sys-color-on-surface);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.post-related__title .md-icon {
  color: var(--md-sys-color-primary);
}

.post-related__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.post-related__item {
  display: flex;
  gap: 12px;
  padding: 12px;
  border-radius: var(--md-sys-shape-corner-medium);
  border: 1px solid var(--md-sys-color-outline-variant);
  text-decoration: none;
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard),
              border-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-related__item:hover {
  background: var(--md-sys-color-surface-container);
  border-color: var(--md-sys-color-primary);
  text-decoration: none;
}

.post-related__cover {
  width: 64px;
  height: 64px;
  border-radius: var(--md-sys-shape-corner-small);
  object-fit: cover;
  flex-shrink: 0;
  margin: 0;
}

.post-related__info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.post-related__name {
  font: var(--md-sys-typescale-title-small);
  color: var(--md-sys-color-on-surface);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.post-related__date {
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-on-surface-variant);
}

/* ===================================
 * Series Navigation
 * =================================== */
.post-series {
  margin-top: 32px;
  padding: 20px;
  background: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-large);
  border-left: 4px solid var(--md-sys-color-primary);
}

.post-series__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font: var(--md-sys-typescale-title-medium);
  color: var(--md-sys-color-on-surface);
}

.post-series__header .md-icon {
  color: var(--md-sys-color-primary);
}

.post-series__count {
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-on-surface-variant);
  margin-left: auto;
}

.post-series__list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: series;
}

.post-series__item {
  counter-increment: series;
  padding: 8px 12px;
  border-radius: var(--md-sys-shape-corner-small);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.post-series__item::before {
  content: counter(series) '.';
  font: var(--md-sys-typescale-label-large);
  color: var(--md-sys-color-on-surface-variant);
  min-width: 24px;
}

.post-series__item:hover {
  background: var(--md-sys-color-surface-container);
}

.post-series__item.active {
  background: var(--md-sys-color-primary-container);
}

.post-series__link {
  font: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
  flex: 1;
}

.post-series__item.active .post-series__link {
  color: var(--md-sys-color-on-primary-container);
  font-weight: 500;
}

.post-series__link:hover {
  color: var(--md-sys-color-primary);
}

.post-series__current-badge {
  font: var(--md-sys-typescale-label-small);
  color: var(--md-sys-color-on-primary-container);
  background: var(--md-sys-color-primary);
  padding: 2px 8px;
  border-radius: var(--md-sys-shape-corner-full);
}

/* ===================================
 * Responsive
 * =================================== */
@media (max-width: 768px) {
  .post-content pre code {
    font-size: 0.8125em;
  }

  .post-content table {
    font-size: 0.875em;
  }

  .post-content th,
  .post-content td {
    padding: 0.5em 0.75em;
  }

  .post-nav {
    flex-direction: column;
  }

  .post-nav__item--next {
    text-align: left;
  }

  .post-share {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .post-author {
    flex-direction: column;
    text-align: center;
  }

  .post-author__info {
    align-items: center;
  }

  .post-related__list {
    grid-template-columns: 1fr;
  }
}