/* ============================================
   Warmpaper - A Claude-inspired Hexo Theme
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-bg: #FAF9F7;
  --color-surface: #FFFFFF;
  --color-surface-hover: #FDF8F4;
  --color-code-bg: #F0EBE3;
  --color-accent: #DA7756;
  --color-accent-hover: #C4684A;
  --color-text: #2D2B28;
  --color-text-secondary: #6B6560;
  --color-text-tertiary: #9B9490;
  --color-border: #E5E0D8;
  --color-border-light: #EEEAE4;
  --grid-color: rgba(218, 119, 86, 0.07);
  --grid-color-strong: rgba(218, 119, 86, 0.12);
  --grid-size: 24px;
  --content-width: 800px;
  --page-width: 1200px;
  --sidebar-width: 200px;
  --header-height: 60px;
  --font-sans: 'LXGW WenKai GB', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-serif: 'LXGW WenKai GB', 'Georgia', 'Times New Roman', serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --radius: 8px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.03);

  /* Syntax highlighting colors — "warm ink on paper" */
  --color-syntax-keyword: #A0522D;
  --color-syntax-string: #4E7A3E;
  --color-syntax-comment: #9B9490;
  --color-syntax-number: #2E7D6F;
  --color-syntax-function: #7B4B2A;
  --color-syntax-type: #7F5061;
  --color-syntax-operator: #6B6560;
  --color-syntax-attribute: #B5651D;
  --color-syntax-meta: #9C6B6B;
  --color-syntax-regexp: #C06040;
  --color-syntax-addition-text: #3C763D;
  --color-syntax-addition-bg: #DFF0D8;
  --color-syntax-deletion-text: #A94442;
  --color-syntax-deletion-bg: #F2DEDE;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

/* --- Base --- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(var(--grid-color-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color-strong) 1px, transparent 1px);
  background-size:
    var(--grid-size) var(--grid-size),
    var(--grid-size) var(--grid-size),
    calc(var(--grid-size) * 4) calc(var(--grid-size) * 4),
    calc(var(--grid-size) * 4) calc(var(--grid-size) * 4);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* --- Site Wrapper --- */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 249, 247, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

.header-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo {
  width: 28px;
  height: 28px;
}

.site-title:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* --- Hamburger Toggle (hidden on desktop) --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 10;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle-icon {
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

/* Hamburger → X animation */
.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* --- Profile Card (Homepage) --- */
.profile-card {
  max-width: var(--content-width);
  margin: 0 auto 2rem;
  text-align: center;
  padding: 2rem 1.5rem 1.75rem;
}

.profile-avatar {
  width: 88px;
  height: 88px;
  object-fit: contain;
  margin-bottom: 0.75rem;
}

.profile-name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.35rem;
}

.profile-description {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.profile-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.profile-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  border: 1px solid var(--color-border-light);
  background: var(--color-surface);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.profile-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
}

.profile-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* --- Post List (Homepage) --- */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: var(--content-width);
  margin: 0 auto;
}

/* --- Post Card --- */
.post-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border-light);
  transition: box-shadow 0.25s, transform 0.25s;
}

.post-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.post-card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.post-card-title a {
  color: var(--color-text);
}

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

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  margin-bottom: 0.75rem;
}

.post-card-meta .separator {
  color: var(--color-border);
}

.post-card-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.post-card-excerpt p {
  margin: 0;
}

.read-more {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-accent);
}

.read-more:hover {
  color: var(--color-accent-hover);
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.post-card-tags a {
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
  background: var(--color-bg);
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  transition: color 0.2s, background 0.2s;
}

.post-card-tags a:hover {
  color: var(--color-accent);
  background: var(--color-surface-hover);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2.5rem;
  font-size: 0.9rem;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.5rem;
  border-radius: 4px;
  color: var(--color-text-secondary);
  transition: color 0.2s, background 0.2s;
}

.pagination a:hover {
  color: var(--color-accent);
  background: var(--color-surface);
}

.pagination .current {
  color: var(--color-surface);
  background: var(--color-accent);
  font-weight: 600;
}

.pagination .space {
  color: var(--color-text-tertiary);
}

/* --- Post Detail Page --- */
.post-header {
  max-width: var(--content-width);
  margin: 0 auto 2rem;
  text-align: center;
}

.post-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.post-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
  flex-wrap: wrap;
}

.post-meta .separator {
  color: var(--color-border);
}

/* --- Post Body + TOC Layout --- */
.post-body-wrapper {
  position: relative;
  max-width: var(--content-width);
  margin: 0 auto;
}

/* --- Post Content Typography --- */
.post-content {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  line-height: 1.85;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-family: var(--font-serif);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.35;
  margin-top: 2em;
  margin-bottom: 0.75em;
}

.post-content h1 { font-size: 1.75rem; }
.post-content h2 { font-size: 1.45rem; }
.post-content h3 { font-size: 1.2rem; }
.post-content h4 { font-size: 1.05rem; }

.post-content p {
  margin-bottom: 1.25em;
}

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(218, 119, 86, 0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

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

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.5em 1.25em;
  margin: 1.5em 0;
  color: var(--color-text-secondary);
  background: rgba(218, 119, 86, 0.04);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

.post-content ul,
.post-content ol {
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.post-content li {
  margin-bottom: 0.35em;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--color-text);
}

.post-content pre {
  background: var(--color-code-bg);
  border-radius: var(--radius);
  padding: 1.25em;
  margin: 1.5em 0;
  overflow-x: auto;
  line-height: 1.55;
  border: 1px solid var(--color-border-light);
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.88rem;
}

/* --- Hexo Highlight Code Blocks --- */
figure.highlight {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  margin: 1.5em 0;
  overflow: hidden;
}

figure.highlight table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  margin: 0;
}

figure.highlight td {
  padding: 0;
  border: none;
}

figure.highlight pre {
  margin: 0;
  padding: 0;
  background: none;
  border: none;
}

figure.highlight .gutter {
  width: 2.5em;
  vertical-align: top;
  user-select: none;
}

figure.highlight .gutter pre {
  padding: 1em 0.75em;
  text-align: right;
  color: var(--color-text-tertiary);
  border-right: 1px solid var(--color-border-light);
}

figure.highlight .code pre {
  padding: 1em 1.25em;
  overflow-x: auto;
}

figure.highlight .line {
  line-height: 1.55;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

/* --- Syntax Highlighting: highlight.js tokens (hljs: false, Hexo default) --- */
figure.highlight .comment,
figure.highlight .meta {
  color: var(--color-syntax-comment);
  font-style: italic;
}

figure.highlight .keyword,
figure.highlight .selector-tag,
figure.highlight .tag .name {
  color: var(--color-syntax-keyword);
}

figure.highlight .string,
figure.highlight .symbol,
figure.highlight .bullet {
  color: var(--color-syntax-string);
}

figure.highlight .number,
figure.highlight .literal {
  color: var(--color-syntax-number);
}

figure.highlight .title,
figure.highlight .title.function_ {
  color: var(--color-syntax-function);
}

figure.highlight .built_in,
figure.highlight .type {
  color: var(--color-syntax-type);
}

figure.highlight .params {
  color: var(--color-syntax-operator);
}

figure.highlight .attr,
figure.highlight .attribute,
figure.highlight .tag .attr {
  color: var(--color-syntax-attribute);
}

figure.highlight .regexp,
figure.highlight .link {
  color: var(--color-syntax-regexp);
}

figure.highlight .selector-class,
figure.highlight .selector-id {
  color: var(--color-syntax-function);
}

figure.highlight .addition {
  color: var(--color-syntax-addition-text);
  background: var(--color-syntax-addition-bg);
}

figure.highlight .deletion {
  color: var(--color-syntax-deletion-text);
  background: var(--color-syntax-deletion-bg);
}

/* --- Syntax Highlighting: highlight.js tokens (hljs: true) --- */
figure.highlight .hljs-comment,
figure.highlight .hljs-quote {
  color: var(--color-syntax-comment);
  font-style: italic;
}

figure.highlight .hljs-keyword,
figure.highlight .hljs-selector-tag {
  color: var(--color-syntax-keyword);
}

figure.highlight .hljs-string,
figure.highlight .hljs-symbol,
figure.highlight .hljs-bullet {
  color: var(--color-syntax-string);
}

figure.highlight .hljs-number,
figure.highlight .hljs-literal {
  color: var(--color-syntax-number);
}

figure.highlight .hljs-title,
figure.highlight .hljs-function .hljs-title {
  color: var(--color-syntax-function);
}

figure.highlight .hljs-built_in,
figure.highlight .hljs-type {
  color: var(--color-syntax-type);
}

figure.highlight .hljs-params {
  color: var(--color-syntax-operator);
}

figure.highlight .hljs-attr,
figure.highlight .hljs-attribute {
  color: var(--color-syntax-attribute);
}

figure.highlight .hljs-meta {
  color: var(--color-syntax-meta);
}

figure.highlight .hljs-regexp,
figure.highlight .hljs-link {
  color: var(--color-syntax-regexp);
}

figure.highlight .hljs-selector-class,
figure.highlight .hljs-selector-id {
  color: var(--color-syntax-function);
}

figure.highlight .hljs-addition {
  color: var(--color-syntax-addition-text);
  background: var(--color-syntax-addition-bg);
}

figure.highlight .hljs-deletion {
  color: var(--color-syntax-deletion-text);
  background: var(--color-syntax-deletion-bg);
}

/* --- Syntax Highlighting: PrismJS tokens --- */
figure.highlight .token.comment,
figure.highlight .token.prolog,
figure.highlight .token.doctype,
figure.highlight .token.cdata {
  color: var(--color-syntax-comment);
  font-style: italic;
}

figure.highlight .token.keyword,
figure.highlight .token.tag {
  color: var(--color-syntax-keyword);
}

figure.highlight .token.string,
figure.highlight .token.char,
figure.highlight .token.template-string,
figure.highlight .token.attr-value {
  color: var(--color-syntax-string);
}

figure.highlight .token.number,
figure.highlight .token.boolean {
  color: var(--color-syntax-number);
}

figure.highlight .token.function {
  color: var(--color-syntax-function);
}

figure.highlight .token.class-name {
  color: var(--color-syntax-type);
}

figure.highlight .token.property,
figure.highlight .token.attr-name {
  color: var(--color-syntax-attribute);
}

figure.highlight .token.operator,
figure.highlight .token.punctuation {
  color: var(--color-syntax-operator);
}

figure.highlight .token.selector {
  color: var(--color-syntax-function);
}

figure.highlight .token.regex {
  color: var(--color-syntax-regexp);
}

figure.highlight .token.inserted {
  color: var(--color-syntax-addition-text);
  background: var(--color-syntax-addition-bg);
}

figure.highlight .token.deleted {
  color: var(--color-syntax-deletion-text);
  background: var(--color-syntax-deletion-bg);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  padding: 0.6em 1em;
  border: 1px solid var(--color-border);
  text-align: left;
}

.post-content th {
  background: var(--color-code-bg);
  font-weight: 600;
}

.post-content tr:nth-child(even) {
  background: rgba(240, 235, 227, 0.3);
}

.post-content img {
  border-radius: var(--radius);
  margin: 1em 0;
}

.post-content hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: 2em 0;
}

/* --- TOC Sidebar --- */
.toc-sidebar {
  position: absolute;
  left: calc(100% + 2rem);
  top: 0;
  width: var(--sidebar-width);
}

.toc-wrapper {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  max-height: calc(100vh - var(--header-height) - 4rem);
  overflow-y: auto;
  padding-left: 1rem;
  border-left: 1px solid var(--color-border-light);
}

.toc-wrapper::-webkit-scrollbar {
  width: 3px;
}

.toc-wrapper::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.toc-title {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: 0.75rem;
}

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

.toc ol {
  list-style: none;
  padding-left: 0.85rem;
}

.toc li {
  margin-bottom: 0.25rem;
}

.toc a {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  display: block;
  padding: 0.2rem 0;
  line-height: 1.45;
  transition: color 0.2s;
}

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

.toc a.active {
  color: var(--color-accent);
  font-weight: 500;
}

/* --- Post Footer --- */
.post-footer {
  max-width: var(--content-width);
  margin: 3rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.post-tags a {
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
  background: var(--color-surface);
  padding: 0.2rem 0.65rem;
  border-radius: 3px;
  border: 1px solid var(--color-border-light);
  transition: color 0.2s, border-color 0.2s;
}

.post-tags a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.post-nav a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

/* --- Page (static) --- */
.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
}

.page-content h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

/* --- Archive --- */
.archive {
  max-width: var(--content-width);
  margin: 0 auto;
}

.archive-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
}

.archive-year {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.archive-post {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.5rem 0;
}

.archive-post-date {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.archive-post-title a {
  font-size: 1rem;
  color: var(--color-text);
}

.archive-post-title a:hover {
  color: var(--color-accent);
}

/* --- Category / Tag Header --- */
.category-title,
.tag-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2rem;
}

.category-title span,
.tag-title span {
  color: var(--color-accent);
}

/* --- Tags Index (cloud) --- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1rem;
}

.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-card);
  transition: color 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.tag-cloud-item:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
}

.tag-cloud-count {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  background: var(--color-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  min-width: 1.4em;
  text-align: center;
}

/* --- Categories Index (list) --- */
.category-list {
  display: flex;
  flex-direction: column;
}

.category-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
  transition: color 0.2s;
}

.category-list-item:first-child {
  border-top: 1px solid var(--color-border-light);
}

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

.category-list-name {
  font-size: 1rem;
}

.category-list-count {
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
  background: var(--color-bg);
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  min-width: 1.8em;
  text-align: center;
}

/* --- Shared empty state --- */
.no-data {
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 0.95rem;
  margin-top: 2rem;
}

/* --- Footer --- */
.site-footer {
  margin-top: 3rem;
  padding: 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
  border-top: 1px solid var(--color-border-light);
}

.site-footer p {
  margin: 0.25rem 0;
}

.site-footer a {
  color: var(--color-text-secondary);
}

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

/* --- Responsive --- */
@media (max-width: 1100px) {
  .toc-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 52px;
  }

  body {
    font-size: 15px;
  }

  .main-content {
    padding: 1.5rem 1rem;
  }

  .header-inner {
    padding: 0 1rem;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 0.5rem 0 0.75rem;
    gap: 0;
    border-top: 1px solid var(--color-border-light);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav .nav-link {
    padding: 0.6rem 0;
    font-size: 0.95rem;
  }

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

  .post-card {
    padding: 1.25rem;
  }

  .post-card-title {
    font-size: 1.15rem;
  }

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

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

  .post-nav a {
    max-width: 100%;
  }
}