/* BrainBoner.me — Main Stylesheet */
/* Theme colors are in /css/themes.css (generated from _data/themes.json) */

/* === Reset & Base === */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Inline SVG icons */
svg {
  vertical-align: middle;
  flex-shrink: 0;
}

/* === Layout === */

.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* === Sidebar === */

.sidebar {
  width: 260px;
  background-color: var(--bg-tertiary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 40;
  overflow-y: auto;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.sidebar-tagline {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.sidebar-brand-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.sidebar-header-actions {
  display: flex;
  align-items: center;
  margin-top: 12px;
  min-width: 0;
}

.sidebar-search {
  flex: 1;
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-hover);
  border-radius: 6px;
  padding: 6px 10px;
  color: var(--text-primary);
  font-size: 0.8125rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.sidebar-search:focus {
  border-color: var(--accent);
}

.sidebar-search::placeholder {
  color: var(--text-muted);
}

.theme-toggle,
.sidebar-collapse-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--text-muted);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  padding: 6px;
  color: var(--text-primary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.875rem;
  line-height: 1;
  transition: border-color 0.15s ease, color 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.theme-toggle:hover,
.sidebar-collapse-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

/* Sidebar content (categories tree) */

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
}

.sidebar-category {
  margin-bottom: 8px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
}

.category-header:hover {
  color: var(--accent);
}

.category-link {
  color: inherit;
  text-decoration: none;
  flex: 1;
}

.category-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.category-toggle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: transform 0.15s ease;
  width: 14px;
  text-align: center;
  flex-shrink: 0;
}

.category-toggle.open {
  transform: rotate(90deg);
}

.category-count {
  margin-left: auto;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.6875rem;
  font-weight: 400;
  padding: 1px 6px;
  border-radius: 10px;
}

.category-children {
  padding-left: 14px;
  margin-left: 8px;
  border-left: 1px solid var(--border);
  display: none;
}

.category-children.open {
  display: block;
}

.month-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 0;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--accent);
  user-select: none;
}

.month-link {
  color: inherit;
  text-decoration: none;
  flex: 1;
}

.month-link:hover {
  text-decoration: underline;
}

.month-toggle {
  font-size: 0.625rem;
  color: var(--text-secondary);
  transition: transform 0.15s ease;
  width: 12px;
  text-align: center;
  flex-shrink: 0;
}

.month-toggle.open {
  transform: rotate(90deg);
}

.month-count {
  margin-left: auto;
  color: var(--text-secondary);
  font-size: 0.6875rem;
}

.month-children {
  padding-left: 14px;
  margin-left: 4px;
  border-left: 1px solid var(--border);
  display: none;
}

.month-children.open {
  display: block;
}

.sidebar-post-link {
  display: block;
  padding: 4px 8px;
  margin-bottom: 2px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-radius: 4px;
  transition: background 0.1s ease, color 0.1s ease;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-post-link:hover {
  background: var(--accent-subtle);
  color: var(--text-primary);
}

.sidebar-post-link.active {
  background: var(--sidebar-active);
  color: var(--text-primary);
  border-left: 2px solid var(--sidebar-active-border);
  padding-left: 6px;
}

/* Sidebar bottom nav */

.sidebar-nav {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  flex-shrink: 0;
  margin-top: auto;
}

.sidebar-nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 4px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  transition: background 0.1s ease, color 0.1s ease, border-color 0.1s ease;
}

.sidebar-nav-link:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

/* Sidebar collapsed state */

.sidebar.collapsed {
  width: 260px;
  transform: translateX(-260px);
  overflow: visible;
}

.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .sidebar-tagline,
.sidebar.collapsed .sidebar-header-actions,
.sidebar.collapsed .sidebar-content,
.sidebar.collapsed .sidebar-nav {
  display: none;
}

.sidebar.collapsed .sidebar-header {
  display: block;
  padding: 0;
  border: none;
  background: transparent;
}

.sidebar.collapsed .sidebar-brand-row {
  display: block;
}

.sidebar.collapsed .sidebar-brand-row > a {
  display: none;
}

/* Pull tab — visible when collapsed */
.sidebar.collapsed .sidebar-collapse-btn {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 52px;
  border-radius: 0 8px 8px 0;
  border: 1px solid var(--border-hover);
  border-left: none;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  padding: 0;
  cursor: pointer;
  z-index: 200;
  box-shadow: 2px 0 8px rgba(0,0,0,0.15);
  margin: 0;
}

.sidebar.collapsed .sidebar-collapse-btn:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
  width: 24px;
}

.sidebar.collapsed .sidebar-brand-row {
  justify-content: center;
}

.sidebar.collapsed .sidebar-header-actions {
  flex-direction: column;
  margin-top: 0;
}

/* Sidebar icon strip (shown when collapsed) */

.sidebar-icons {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.sidebar.collapsed .sidebar-icons {
  display: flex;
}

.sidebar-icon {
  font-size: 1rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s ease;
}

.sidebar-icon:hover {
  opacity: 1;
}

/* Inline search filtering */

.search-match {
  background: var(--accent-subtle);
  border-left: 2px solid var(--accent);
  padding-left: calc(var(--sidebar-indent, 12px) - 2px);
}

mark.search-highlight {
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: 2px;
  padding: 0 2px;
  font-style: normal;
}

.search-no-results {
  padding: 12px 16px;
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-align: center;
  font-style: italic;
}

/* === Reading Progress Bar === */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent);
  z-index: 9999;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* === Figure / Image captions === */

.prose figure {
  margin: 1.5rem 0;
}

.prose figcaption {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 8px;
  font-style: italic;
}

/* === Tables === */

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  overflow-x: auto;
  display: block;
}

.prose table th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--border-hover);
}

.prose table td {
  padding: 9px 14px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.prose table tr:nth-child(even) td {
  background: var(--bg-tertiary);
}

.prose table tr:hover td {
  background: var(--accent-subtle);
}

/* === KaTeX Math === */

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1rem 0;
  margin: 1.5rem 0;
}

.katex {
  font-size: 1.05em;
  color: var(--text-primary);
}

/* === Main Content === */

.main-content {
  flex: 1;
  margin-left: 260px;
  min-height: 100vh;
  transition: margin-left 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.sidebar.collapsed ~ .main-content {
  margin-left: 0;
}

.main-topbar {
  position: fixed;
  top: 12px;
  right: 16px;
  z-index: 100;
}

/* Floating hamburger — desktop only, shown when sidebar collapsed */
.sidebar-open-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 100;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hover);
  border-radius: 8px;
  color: var(--text-primary);
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transition: background 0.15s ease, opacity 0.2s ease;
}

.sidebar-open-btn:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

/* Invisible left-edge hover strip */
.sidebar-edge-zone {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 16px;
  height: 100vh;
  z-index: 99;
}

/* Show hamburger + edge zone only on desktop when sidebar is collapsed */
.sidebar.collapsed ~ .main-content .sidebar-open-btn {
  display: flex;
}

.sidebar.collapsed ~ .main-content .sidebar-edge-zone {
  display: block;
}

.main-content-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 32px;
  flex: 1;
}

/* === Cards Grid === */

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.page-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Category filter pills */

.filter-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-pill {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.filter-pill:hover {
  color: var(--text-primary);
  border-color: var(--border);
}

.filter-pill.active {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

/* Post cards */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.post-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  color: inherit;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.card-category {
  font-size: 0.6875rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.card-date {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.card-excerpt {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.card-tag {
  font-size: 0.6875rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
}

/* === Post View === */

.breadcrumb {
  font-size: 0.75rem;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--accent);
}

.breadcrumb span {
  margin: 0 4px;
}

.post-header {
  margin-bottom: 24px;
}

.post-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
}

.post-meta {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.post-meta-tag {
  color: var(--accent);
}

/* Table of Contents */

.toc {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 28px;
}

.toc-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: var(--bg-secondary);
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 10px 14px;
  cursor: pointer;
  gap: 8px;
  transition: background 0.1s ease;
}

.toc-title:hover {
  background: var(--accent-subtle);
  color: var(--text-primary);
}

.toc-toggle-icon {
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.toc-list {
  list-style: none;
  padding: 10px 14px;
  margin: 0;
  background: var(--bg-tertiary);
}

.toc-list li {
  margin: 0;
}

.toc-list li a {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-decoration: none;
  display: block;
  padding: 3px 0;
  transition: color 0.1s ease;
}

.toc-list li a:hover {
  color: var(--accent);
}

.toc-list li.toc-h3 {
  padding-left: 12px;
  border-left: 1px solid var(--border);
  margin-left: 6px;
}

.toc-list li.toc-h3 a {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.toc-list li.toc-h3 a:hover {
  color: var(--accent);
}

/* Math FOUC prevention — hide raw $$ blocks until KaTeX renders */
.math-display { visibility: hidden; }
.math-inline   { visibility: hidden; }
body.katex-ready .math-display { visibility: visible; }
body.katex-ready .math-inline   { visibility: visible; }

/* kbd, mark, details */

.prose kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hover);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.8125rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
}

.prose mark {
  background: rgba(210, 153, 34, 0.3);
  color: var(--text-primary);
  padding: 1px 3px;
  border-radius: 3px;
}

[data-theme="light"] .prose mark {
  background: rgba(210, 153, 34, 0.25);
}

.prose details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 1rem 0;
  background: var(--bg-tertiary);
}

.prose details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  user-select: none;
}

.prose details[open] summary {
  margin-bottom: 12px;
}

/* Post prose content */

.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.prose h2,
.prose h3,
.prose h4 {
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: 0.5em;
  color: var(--text-primary);
}

.prose h2 { font-size: 1.375rem; }
.prose h3 { font-size: 1.125rem; }
.prose h4 { font-size: 1rem; }

.prose p {
  margin-bottom: 1em;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose strong {
  color: var(--text-primary);
  font-weight: 600;
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 1.5em 0;
  color: var(--text-secondary);
  font-style: italic;
}

.prose ul,
.prose ol {
  padding-left: 1.5em;
  margin-bottom: 1em;
}

.prose li {
  margin-bottom: 0.25em;
}

.prose img {
  border-radius: 8px;
  margin: 1.5em 0;
  background: #ffffff;
  padding: 8px;
}

/* Code blocks */

.prose code {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Space Mono', monospace;
  font-size: 0.875em;
}

.prose pre {
  margin: 1.5em 0;
  border-radius: 8px;
  border: 1px solid var(--code-border);
  overflow: hidden;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.875rem;
}

.code-block-wrapper {
  position: relative;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--code-border);
  font-size: 0.75rem;
}

.code-block-lang {
  color: var(--text-muted);
}

.code-copy-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background 0.15s ease;
}

.code-copy-btn:hover {
  background: var(--accent-subtle);
}

.code-block-body {
  padding: 0;
  background: var(--code-bg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch; /* smooth scroll on iOS */
}

/* Scrollbar styling for code blocks */
.code-block-body::-webkit-scrollbar {
  height: 6px;
}
.code-block-body::-webkit-scrollbar-track {
  background: var(--code-bg);
}
.code-block-body::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 3px;
}

.code-block-body pre {
  margin: 0;
  border: none;
  padding: 10px 0;
  min-width: max-content; /* prevents wrapping — forces scrollbar instead */
  border-radius: 0;
}

/* Line numbers */
code.has-line-numbers {
  counter-reset: line;
  display: block;
}

.code-line {
  display: block;
  padding: 0 16px 0 52px;
  position: relative;
  line-height: 1.5;
}

.code-line::before {
  counter-increment: line;
  content: counter(line);
  position: absolute;
  left: 0;
  width: 36px;
  text-align: right;
  color: var(--text-muted);
  font-size: 0.75em;
  line-height: 1.5;
  padding-right: 10px;
  user-select: none;
  border-right: 1px solid var(--border);
}

.code-line:hover {
  background: rgba(255, 255, 255, 0.03);
}

[data-theme="light"] .code-line:hover {
  background: rgba(0, 0, 0, 0.03);
}

/* Prev/Next navigation */

.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  gap: 16px;
}

.post-nav-link {
  text-decoration: none;
}

.post-nav-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.post-nav-title {
  font-size: 0.875rem;
  color: var(--accent);
  margin-top: 2px;
}

.post-nav-next {
  text-align: right;
  margin-left: auto;
}

/* === Pagination === */

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
}

.pagination a,
.pagination span {
  font-size: 0.8125rem;
  padding: 4px 12px;
  border-radius: 4px;
  text-decoration: none;
}

.pagination .current {
  background: var(--accent);
  color: #fff;
}

.pagination a {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.pagination a:hover {
  color: var(--text-primary);
}

/* === Footer === */

.site-footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* === Tags Page === */

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.tag-item:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tag-count {
  font-size: 0.6875rem;
  color: var(--text-muted);
  background: var(--bg-primary);
  padding: 1px 6px;
  border-radius: 8px;
}

/* === Archive Page === */

.archive-year {
  margin-bottom: 32px;
}

.archive-year-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.archive-list {
  list-style: none;
  padding: 0;
}

.archive-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.archive-item:last-child {
  border-bottom: none;
}

.archive-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
  min-width: 80px;
}

.archive-title a {
  font-size: 0.9375rem;
  font-weight: 500;
}

.archive-category {
  font-size: 0.6875rem;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}

/* === Mobile === */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 35;
}

.sidebar-overlay.visible {
  display: block;
}

.mobile-header {
  display: none;
  position: sticky;
  top: 0;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  z-index: 30;
  align-items: center;
  justify-content: space-between;
}

.mobile-menu-btn svg {
  width: 18px;
  height: 18px;
}

.mobile-menu-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
}

.mobile-site-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

@media (max-width: 1023px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .sidebar {
    transform: translateX(-100%);
    width: 280px;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar.collapsed {
    width: 280px;
    transform: translateX(-100%);
  }

  .sidebar.collapsed.mobile-open {
    transform: translateX(0);
  }

  .sidebar.collapsed .sidebar-title,
  .sidebar.collapsed .sidebar-tagline,
  .sidebar.collapsed .sidebar-search,
  .sidebar.collapsed .sidebar-content,
  .sidebar.collapsed .sidebar-nav {
    display: initial;
  }

  .sidebar.collapsed .sidebar-icons {
    display: none;
  }

  .sidebar.collapsed .sidebar-header {
    padding: 16px;
    flex-direction: column;
    align-items: stretch;
  }

  .sidebar.collapsed .sidebar-header-actions {
    flex-direction: row;
  }

  .main-content {
    margin-left: 0;
  }

  .sidebar.collapsed ~ .main-content {
    margin-left: 0;
  }

  .mobile-header {
    display: flex;
  }

  .sidebar-collapse-btn {
    display: none;
  }

  .main-topbar {
    top: 10px;
    right: 12px;
  }

  .main-content-inner {
    padding: 16px 20px;
  }


  .cards-grid {
    grid-template-columns: 1fr;
  }

  .post-title {
    font-size: 1.375rem;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .post-nav-next {
    text-align: left;
    margin-left: 0;
  }
}

/* ── Homepage hero ───────────────────────────────────────────────────────────── */

.home-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border-color);
}

.home-terminal-bar {
  display: flex;
  gap: 7px;
  align-items: center;
  margin-bottom: 14px;
}

.home-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.home-dot-red    { background: #ff5f57; }
.home-dot-yellow { background: #febc2e; }
.home-dot-green  { background: #28c840; }

.home-eyebrow {
  font-family: monospace;
  font-size: 13px;
  color: #3fb950;
  margin-bottom: 18px;
}

.home-eyebrow::before { content: '$ '; color: var(--text-muted); }

.home-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: #3fb950;
  margin-left: 2px;
  vertical-align: middle;
  animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor { 50% { opacity: 0; } }

.home-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -2px;
  margin-bottom: 18px;
  color: var(--text-primary);
}

.home-accent { color: var(--accent); }

.home-sub {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 460px;
  margin-bottom: 28px;
}

.home-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.home-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-family: monospace;
  text-decoration: none;
  transition: opacity 0.15s;
}

.home-tag:hover { opacity: 0.75; }

.home-hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
}

.home-hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
}

.home-gif-wrap {
  position: relative;
  width: 260px;
  height: 260px;
  border-radius: 20px;
}

/* Fluid aurora layer 1 — slow spin */
.home-gif-wrap::before {
  content: '';
  position: absolute;
  inset: -18px;
  border-radius: 32px;
  background: conic-gradient(
    from 0deg,
    #58a6ff,
    #a371f7,
    #ff7b9c,
    #ffa657,
    #3fb950,
    #58a6ff
  );
  filter: blur(22px);
  opacity: 0;
  transition: opacity 0.8s ease;
  animation: aurora-spin 6s linear infinite;
  z-index: 0;
}

/* Fluid aurora layer 2 — faster counter-spin, different colors */
.home-gif-wrap::after {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: 28px;
  background: conic-gradient(
    from 180deg,
    #a371f7,
    #3fb950,
    #58a6ff,
    #ffa657,
    #ff5f57,
    #a371f7
  );
  filter: blur(30px);
  opacity: 0;
  transition: opacity 0.8s ease;
  animation: aurora-spin-reverse 9s linear infinite;
  z-index: 0;
}

.home-gif-wrap:hover::before { opacity: 0.55; }
.home-gif-wrap:hover::after  { opacity: 0.35; }

.home-gif {
  width: 260px;
  height: 260px;
  object-fit: contain;
  border-radius: 20px;
  position: relative;
  z-index: 1;
  transition: transform 0.5s ease;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 8%, black 92%, transparent 100%),
                      linear-gradient(to right,  transparent 0%, black 8%, black 92%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to bottom, transparent 0%, black 8%, black 92%, transparent 100%),
              linear-gradient(to right,  transparent 0%, black 8%, black 92%, transparent 100%);
  mask-composite: intersect;
}

.home-gif-wrap:hover .home-gif {
  transform: scale(1.03);
}

@keyframes aurora-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes aurora-spin-reverse {
  from { transform: rotate(0deg); }
  to   { transform: rotate(-360deg); }
}

.home-latest {
  padding: 40px 0 0;
}

.home-latest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.home-section-label {
  font-size: 12px;
  font-family: monospace;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.home-see-all {
  font-size: 13px;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: 6px;
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.home-see-all:hover { opacity: 1; }

.home-cards {
  grid-template-columns: repeat(3, 1fr) !important;
}

@media (max-width: 768px) {
  .home-hero {
    grid-template-columns: 1fr;
    padding: 32px 0 32px;
  }
  .home-hero-right { display: none; }
  .home-title { font-size: 36px; letter-spacing: -1px; }
  .home-cards { grid-template-columns: 1fr !important; }
}

/* ── Reader highlights ──────────────────────────────────────────────────────── */

.prose mark.reader-highlight,
mark.reader-highlight {
  background: #fffb00 !important;
  color: #111 !important;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s;
  padding: 1px 0;
}

[data-theme="dark"] .prose mark.reader-highlight,
[data-theme="dark"] mark.reader-highlight {
  background: #e6e000 !important;
  color: #111 !important;
}

.prose mark.reader-highlight:hover,
mark.reader-highlight:hover {
  background: #ffe500 !important;
}

[data-theme="dark"] .prose mark.reader-highlight:hover,
[data-theme="dark"] mark.reader-highlight:hover {
  background: #ccca00 !important;
}

#highlight-toolbar {
  position: absolute;
  display: none;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  z-index: 9999;
  pointer-events: all;
}

#highlight-toolbar.visible {
  display: flex;
}

#highlight-btn {
  background: #fffb00;
  color: #222;
  border: none;
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

#highlight-btn:hover {
  background: #ffe500;
}

[data-theme="dark"] #highlight-btn {
  background: #e6e000;
  color: #111;
}

[data-theme="dark"] #highlight-btn:hover {
  background: #ccca00;
}