/* ============================================================
   DevFolio - Main Stylesheet
   Content-First · Minimalist · Extensible
   ============================================================ */

/* ===== CSS Custom Properties ===== */
:root {
  /* Light Mode Colors */
  --color-bg: #FFFFFF;
  --color-text: #1F2937;
  --color-muted: #6B7280;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-border: #E5E7EB;
  --color-code-bg: #F8FAFC;
  --color-card-bg: #FFFFFF;
  --color-nav-bg: rgba(255, 255, 255, 0.85);
  --color-warning-bg: #FEF3C7;
  --color-warning-text: #92400E;
  --color-warning-border: #FCD34D;
  --color-selection: rgba(37, 99, 235, 0.15);

  /* Typography */
  --font-base: 'Inter', 'PingFang SC', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', 'Consolas', monospace;
  --font-size-base: 16px;
  --line-height: 1.75;
  --letter-spacing: 0.01em;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --content-width: 900px;
  --wide-width: 1240px;
  --radius: 8px;
  --radius-sm: 4px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
}

/* ===== Dark Mode ===== */
html.dark {
  --color-bg: #0F172A;
  --color-text: #E2E8F0;
  --color-muted: #94A3B8;
  --color-accent: #3B82F6;
  --color-accent-hover: #2563EB;
  --color-border: #334155;
  --color-code-bg: #1E293B;
  --color-card-bg: #1E293B;
  --color-nav-bg: rgba(15, 23, 42, 0.9);
  --color-warning-bg: #422006;
  --color-warning-text: #FDE68A;
  --color-warning-border: #78350F;
  --color-selection: rgba(59, 130, 246, 0.2);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-base);
  font-size: 1rem;
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: default;
}

::selection {
  background-color: var(--color-selection);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  color: var(--color-text);
  font-weight: 700;
}

h1 { font-size: 2rem; font-weight: 800; margin: var(--space-xl) 0 var(--space-md); }
h2 { font-size: 1.5rem; margin: var(--space-lg) 0 var(--space-sm); }
h3 { font-size: 1.25rem; font-weight: 600; margin: var(--space-md) 0 var(--space-sm); }
h4 { font-size: 1.125rem; font-weight: 600; margin: var(--space-sm) 0 var(--space-xs); }

p {
  margin-bottom: var(--space-lg);
}

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

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

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

strong { font-weight: 600; }

blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-accent);
  background: var(--color-code-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-muted);
}

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

hr {
  border: none;
  border-top: 1px solid var(--color-border);
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: var(--space-lg);
}

li {
  margin-bottom: var(--space-xs);
}

/* ===== Utility Classes ===== */
.text-muted { color: var(--color-muted); }
.text-center { text-align: center; }

/* ===== Navigation Bar ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 60px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
}

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

.nav-logo {
  max-height: 32px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu li {
  margin: 0;
  display: flex;
  align-items: center;
}

.nav-menu a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 0.925rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-accent);
  background-color: var(--color-selection);
}

.nav-github {
  color: var(--color-muted) !important;
  padding: var(--space-sm) !important;
}

.nav-github:hover {
  color: var(--color-text) !important;
}

/* Hamburger Menu Button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  gap: 5px;
}

.nav-toggle-bar {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Dark Mode Toggle Button */
.darkmode-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.darkmode-toggle:hover {
  color: var(--color-text);
  background-color: var(--color-code-bg);
}

html.dark .icon-sun { display: none; }
html:not(.dark) .icon-moon { display: none; }

/* ===== Main Container ===== */
.site-content {
  min-height: calc(100vh - 60px - 80px);
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

@media (min-width: 768px) {
  .container {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-2xl);
  }
}

/* ===== Article Header / Archive ===== */
.archive-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.archive-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-muted);
}

/* ===== Post Card (List) ===== */
.post-card {
  margin-bottom: var(--space-lg);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

html.dark .post-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.post-card-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  align-items: stretch;
}

@media (min-width: 640px) {
  .post-card-inner {
    grid-template-columns: 280px 1fr;
  }
}

.post-card-thumb {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 220px;
  overflow: hidden;
  background: var(--color-code-bg);
}

@media (min-width: 640px) {
  .post-card-thumb {
    aspect-ratio: auto;
  }
}

.post-card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--transition-base);
}

.post-card:hover .post-card-thumb img {
  transform: scale(1.05);
}

.post-card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
}

.post-card-excerpt {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-more {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: gap var(--transition-fast);
}

.post-card-more:hover {
  gap: 10px;
  color: var(--color-accent-hover);
}

.post-header {
  margin-bottom: var(--space-md);
}

.post-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.post-title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--color-muted);
}

.post-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.post-meta-item svg {
  flex-shrink: 0;
}

.post-meta-item a {
  color: var(--color-muted);
}

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

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

.post-separator {
  margin: var(--space-2xl) 0;
}

/* ===== Post Detail ===== */
.post-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  position: relative;
}

@media (min-width: 1024px) {
  .post-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

.post-detail {
  min-width: 0;
  max-width: 100%;
  position: relative;
}

.post-detail .post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-detail .post-title {
  font-size: 2rem;
  font-weight: 800;
}

/* ===== Entry Content / Article Body ===== */
.entry-content {
  line-height: var(--line-height);
  font-size: 1.05rem;
}

.entry-content p {
  margin-bottom: var(--space-lg);
}

.entry-content img {
  margin: var(--space-lg) 0;
  border-radius: var(--radius);
  cursor: zoom-in;
}

.entry-content figure {
  margin: var(--space-lg) 0;
}

.entry-content figcaption {
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-muted);
  text-align: center;
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 0.925rem;
}

.entry-content th,
.entry-content td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  text-align: left;
}

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

/* ===== Code Blocks ===== */
.entry-content pre {
  margin: var(--space-lg) 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-code-bg);
}

.entry-content pre code {
  display: block;
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  tab-size: 4;
  -moz-tab-size: 4;
  color: var(--color-text);
}

/* Inline code */
.entry-content :not(pre) > code {
  padding: 0.15em 0.4em;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--color-accent);
  word-break: break-word;
}

/* Mac-style code header */
.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-code-bg);
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-muted);
  user-select: none;
  overflow: hidden;
}

.code-dots {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.code-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-dots .dot.red    { background: #FF5F57; }
.code-dots .dot.yellow { background: #FFBD2E; }
.code-dots .dot.green  { background: #28C840; }

.code-lang {
  flex-shrink: 0;
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
}

.code-file {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Code block wrapper for copy button */
.code-block-wrapper {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-family: var(--font-base);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 2;
  opacity: 0;
}

.code-block-wrapper:hover .copy-btn,
.copy-btn:focus {
  opacity: 1;
}

.copy-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.copy-btn.copied {
  color: #059669;
  border-color: #059669;
  background: #ECFDF5;
}

html.dark .copy-btn.copied {
  background: #064E3B;
}

/* ===== TOC (Table of Contents) ===== */
.post-sidebar {
  display: none;
  position: absolute;
  top: 0;
  left: -260px;
  width: 220px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  z-index: 30;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  scrollbar-width: thin;
}

@media (min-width: 1280px) {
  .post-sidebar {
    display: block;
  }
}

@media (max-width: 1279px) {
  .post-sidebar {
    display: none !important;
  }
}

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

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.toc-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
}

.toc-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
  padding: 2px;
}

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

.toc-list .toc a {
  display: block;
  padding: var(--space-xs) 0;
  font-size: 0.825rem;
  color: var(--color-muted);
  border-left: 2px solid transparent;
  padding-left: var(--space-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.toc-list .toc a:hover,
.toc-list .toc a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.toc-list .toc .toc-h3 a { padding-left: calc(var(--space-md) + var(--space-md)); }
.toc-list .toc .toc-h4 a { padding-left: calc(var(--space-md) + var(--space-xl)); }

/* Mobile TOC Button */
.toc-mobile-btn {
  display: flex;
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-accent);
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 50;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

@media (min-width: 1024px) {
  .toc-mobile-btn {
    display: none;
  }
}

.toc-mobile-btn:hover {
  transform: scale(1.1);
}

/* Mobile TOC overlay */
.toc-mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
  display: none;
}

.toc-mobile-overlay.active {
  display: block;
}

.toc-mobile-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--color-bg);
  z-index: 91;
  padding: var(--space-xl);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.toc-mobile-panel.active {
  transform: translateX(0);
}

/* ===== Outdated Warning ===== */
.outdated-warning {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding: var(--space-md);
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius);
  color: var(--color-warning-text);
  font-size: 0.9rem;
  line-height: 1.6;
}

.outdated-warning svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== Post Footer Meta ===== */
.post-footer-meta {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-tags {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.post-tags a {
  display: inline-block;
  padding: 2px 10px;
  margin: 2px 4px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

.post-tech-stack {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
}

.post-tech-label {
  color: var(--color-muted);
}

.tech-badge {
  display: inline-block;
  padding: 2px 10px;
  background: var(--color-accent);
  color: #FFFFFF;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* ===== Post Copyright ===== */
.post-copyright {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.7;
}

.post-copyright-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.post-copyright-content {
  color: var(--color-muted);
}

.post-copyright-content a {
  color: var(--color-accent);
  text-decoration: none;
}

.post-copyright-content a:hover {
  text-decoration: underline;
}

/* ===== Post Navigation (Prev/Next) ===== */
.post-nav {
  margin: var(--space-2xl) 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.post-nav-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-md);
}

.post-nav-prev,
.post-nav-next {
  flex: 1;
  min-width: 0;
}

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

.post-nav-prev a,
.post-nav-next a {
  display: block;
  padding: var(--space-md);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.post-nav-prev a:hover,
.post-nav-next a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== Comments ===== */
.comments-area {
  margin-top: var(--space-2xl);
}

.comments-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
}

.comment-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.comment-list > li {
  margin-bottom: var(--space-md);
}

.comment-body {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
}

.comment-by-author > .comment-body {
  border-left: 3px solid var(--color-accent);
}

.comment-author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.comment-author .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.comment-author cite {
  font-style: normal;
  font-weight: 600;
  color: var(--color-text);
}

.comment-author cite a {
  color: var(--color-text);
}

.comment-meta {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.comment-meta a {
  color: var(--color-muted);
}

.comment-content {
  font-size: 0.95rem;
  margin-top: var(--space-sm);
}

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

.comment-reply {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
}

.comment-reply a {
  color: var(--color-muted);
}

.comment-awaiting-moderation {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-style: italic;
}

.comment-children {
  margin-top: var(--space-md);
  margin-left: var(--space-xl);
  padding-left: var(--space-md);
  border-left: 1px solid var(--color-border);
}

.comment-respond {
  margin-top: var(--space-xl);
}

.comment-form-field {
  margin-bottom: var(--space-md);
}

.comment-form textarea {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.comment-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.comment-form-meta {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.comment-form-meta input {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast);
}

.comment-form-meta input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.comment-login-info {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.cancel-comment-reply {
  margin-bottom: var(--space-sm);
  font-size: 0.85rem;
}

.cancel-comment-reply a {
  color: var(--color-muted);
}

.comment-closed {
  text-align: center;
  color: var(--color-muted);
  padding: var(--space-xl);
}

.comment-nav {
  margin: var(--space-lg) 0;
}

/* ===== Showcase Grid ===== */
.showcase-header {
  margin-bottom: var(--space-2xl);
  text-align: center;
}

.showcase-page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.showcase-page-desc {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto;
}

.showcase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .showcase-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.showcase-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.showcase-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

html.dark .showcase-card:hover {
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.showcase-cover {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--color-code-bg);
}

.showcase-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--transition-base);
}

.showcase-card:hover .showcase-cover img {
  transform: scale(1.05);
}

.showcase-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.showcase-card:hover .showcase-overlay {
  opacity: 1;
}

.showcase-actions {
  display: flex;
  gap: var(--space-sm);
}

.showcase-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #FFFFFF;
  color: #1F2937;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.showcase-action-btn:hover {
  background: var(--color-accent);
  color: #FFFFFF;
}

.showcase-body {
  padding: var(--space-md);
}

.showcase-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

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

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

.showcase-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== Pagination ===== */
.pagination ul {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  list-style: none;
  padding: 0;
  margin: var(--space-2xl) 0;
}

.pagination li a {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.pagination li a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination .current a {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #FFFFFF;
  pointer-events: none;
}

.pagination .prev {
  margin-right: auto;
}

.pagination .next {
  margin-left: auto;
}

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

.search-title {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.search-form {
  margin-bottom: var(--space-lg);
}

.search-input-group {
  position: relative;
}

.search-input-group .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  pointer-events: none;
}

.search-input-group input[type="search"] {
  width: 100%;
  padding: var(--space-md) var(--space-md) var(--space-md) 44px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-base);
  transition: border-color var(--transition-fast);
}

.search-input-group input[type="search"]:focus {
  outline: none;
  border-color: var(--color-accent);
}

.search-categories {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.search-categories .category-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  list-style: none;
  padding: 0;
}

.search-categories .category-cloud a {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--color-muted);
  transition: all var(--transition-fast);
}

.search-categories .category-cloud a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--color-muted);
}

.empty-state svg {
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* ===== 404 Error Page ===== */
.error-page {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.error-code {
  font-size: 8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.3;
  margin-bottom: var(--space-sm);
}

.error-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.error-desc {
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
  font-size: 1.05rem;
}

.error-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-lg);
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: var(--wide-width);
  margin: 0 auto;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
}

.footer-meta {
  padding-top: var(--space-sm);
  border-top: 1px dashed var(--color-border);
  font-size: 0.8rem;
}

.footer-left,
.footer-right {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.footer-sep {
  opacity: 0.4;
}

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

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

.footer-beian {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.beian-icon {
  width: 14px;
  height: 14px;
  display: inline-block;
  vertical-align: middle;
}

.footer-stat strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ===== Lightbox ===== */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  opacity: 0;
  pointer-events: none;  /* 默认不拦截点击事件 */
  transition: opacity var(--transition-base);
}

.lightbox-overlay.active {
  opacity: 1;
  pointer-events: auto;  /* 激活时可交互 */
}

.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius);
  cursor: default;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: #FFFFFF;
  font-size: 1.5rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ===== External Link Modal ===== */
.external-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.external-modal {
  position: relative;
  background: var(--color-card-bg);
  color: var(--color-text);
  border-radius: var(--radius);
  padding: var(--space-xl);
  max-width: 480px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.external-modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.external-modal-desc {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.external-modal-url {
  background: var(--color-code-bg);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-accent);
  word-break: break-all;
  margin-bottom: var(--space-md);
}

.external-modal-tips {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
}

.external-modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

.external-modal-actions .btn-primary,
.external-modal-actions .btn-outline {
  font-size: 0.9rem;
  padding: 6px 16px;
}

/* ===== Code Block Lines Highlight ===== */
.code-line.highlight {
  background: rgba(37, 99, 235, 0.08);
  display: inline-block;
  width: 100%;
  margin: 0 -2px;
  padding: 0 2px;
}

html.dark .code-line.highlight {
  background: rgba(59, 130, 246, 0.15);
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
  html {
    font-size: 15px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
    display: none;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu a {
    width: 100%;
    justify-content: center;
    padding: var(--space-md);
  }

  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .post-title {
    font-size: 1.25rem;
  }

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

  .post-meta {
    gap: var(--space-sm);
    font-size: 0.8rem;
  }

  .comment-form-meta {
    grid-template-columns: 1fr;
  }

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

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .footer-left,
  .footer-right {
    justify-content: center;
  }
}

@media (min-width: 768px) {
  html {
    font-size: 17px;
  }
}

@media (min-width: 1024px) {
  html {
    font-size: 18px;
  }
}

/* ===== Print Styles ===== */
@media print {
  .site-header,
  .site-footer,
  .post-sidebar,
  .toc-mobile-btn,
  .comments-area,
  .post-nav {
    display: none !important;
  }

  body {
    background: #FFFFFF;
    color: #000000;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* ===== Nav Search ===== */
.nav-search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.nav-search-toggle:hover {
  color: var(--color-accent);
}

.nav-search-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-md) var(--space-lg);
  display: none;
  z-index: 99;
  animation: fadeInDown 0.2s ease;
}
.nav-search-panel.active {
  display: block;
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-search-input-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: var(--content-width);
  margin: 0 auto;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0 var(--space-md);
  transition: border-color var(--transition-fast);
}
.nav-search-input-group:focus-within {
  border-color: var(--color-accent);
}
.nav-search-input-group svg {
  flex-shrink: 0;
  color: var(--color-muted);
}
.nav-search-input {
  width: 100%;
  padding: var(--space-sm) 0;
  border: none;
  outline: none;
  background: transparent;
  color: var(--color-text);
  font-size: 1rem;
}

/* ===== Footer GitHub ===== */
.footer-github {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
}
.footer-github svg {
  flex-shrink: 0;
}

/* ===== Footer Contact ===== */
.footer-contact {
  display: inline-flex;
  align-items: center;
}
.footer-contact svg {
  flex-shrink: 0;
}

/* ===== Comment Lock (Hide Shortcode) ===== */
.comment-lock-inline {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  background: var(--color-warning-bg);
  border: 1px dashed var(--color-warning-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--color-warning-text);
  line-height: 1.6;
}
.comment-lock-inline svg {
  flex-shrink: 0;
  opacity: 0.8;
}
.comment-lock-inline span {
  flex: 1;
}
.comment-lock-inline a {
  flex-shrink: 0;
  padding: 4px 14px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background var(--transition-fast);
}
.comment-lock-inline a:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

/* ===== External Link Modal (Enhanced) ===== */
.external-modal-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}
.external-modal-icon {
  flex-shrink: 0;
  color: var(--color-warning-text);
}
.external-modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  flex: 1;
  line-height: 28px;
}
.external-modal-close {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.external-modal-close:hover {
  color: var(--color-text);
  background: var(--color-selection);
}
.external-modal-body {
  margin-bottom: var(--space-md);
}
.external-modal-desc {
  font-size: 0.93rem;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}
.external-modal-url-box {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
}
.external-modal-link-label {
  display: block;
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-bottom: 4px;
}
.external-modal-link-text {
  display: block;
  font-size: 0.85rem;
  color: var(--color-accent);
  word-break: break-all;
  text-decoration: none;
}
.external-modal-link-text:hover {
  text-decoration: underline;
}
.external-modal-tips {
  font-size: 0.82rem;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ===== Friend Links Page ===== */
.links-header {
  margin-bottom: var(--space-xl);
}
.links-page-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-sm) 0;
}
.links-page-desc {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin: 0;
}
.links-intro {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}
.links-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}
@media (min-width: 640px) {
  .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .links-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Links Card */
.links-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.links-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
}
html.dark .links-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.links-card-avatar {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-code-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.links-card-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.links-card-avatar-fallback {
  color: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.links-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.links-card-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}
.links-card:hover .links-card-name {
  color: var(--color-accent);
}
.links-card-desc {
  font-size: 0.82rem;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.links-card-arrow {
  flex-shrink: 0;
  color: var(--color-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition-fast);
}
.links-card:hover .links-card-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--color-accent);
}

/* Links Apply */
.links-apply {
  margin-bottom: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-code-bg);
  border-radius: var(--radius);
  border: 1px dashed var(--color-border);
  text-align: center;
}
.links-apply p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}
.links-comments {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}


/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}


/* ============================================================
   扩展功能样式 (Extended Features)
   ============================================================ */

/* ===== 1. TOC 自动编号 ===== */
.toc-list .toc {
  counter-reset: toc-h2;
}
.toc-list .toc .toc-h2 {
  counter-increment: toc-h2;
  counter-reset: toc-h3;
}
.toc-list .toc .toc-h2 > a::before {
  content: counter(toc-h2) ". ";
  font-weight: 600;
  color: var(--color-accent);
}
.toc-list .toc .toc-h3 {
  counter-increment: toc-h3;
  counter-reset: toc-h4;
}
.toc-list .toc .toc-h3 > a::before {
  content: counter(toc-h2) "." counter(toc-h3) " ";
  font-weight: 500;
  color: var(--color-muted);
}
.toc-list .toc .toc-h4 {
  counter-increment: toc-h4;
}
.toc-list .toc .toc-h4 > a::before {
  content: counter(toc-h2) "." counter(toc-h3) "." counter(toc-h4) " ";
  font-weight: 400;
  color: var(--color-muted);
  font-size: 0.9em;
}

/* ===== 2. 相关文章推荐 ===== */
.related-posts {
  margin: var(--space-2xl) 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.related-posts-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.related-posts-title svg {
  color: var(--color-accent);
}
.related-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
@media (min-width: 600px) {
  .related-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.related-post-item {
  padding: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.related-post-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.related-post-item .related-post-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-post-item:hover .related-post-title {
  color: var(--color-accent);
}
.related-post-item .related-post-meta {
  font-size: 0.78rem;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: auto;
}

/* ===== 3. 回到顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 80px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(37,99,235,0.3);
}

/* ===== 4. 阅读进度条 ===== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), #7C3AED);
  z-index: 200;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* ===== 5. 图片懒加载增强 ===== */
.entry-content img[loading="lazy"] {
  min-height: 100px;
  background: var(--color-code-bg);
  transition: opacity 0.4s ease;
}
.entry-content img[loading="lazy"]:not([src]) {
  opacity: 0;
}

/* ===== 6. 搜索关键词高亮 ===== */
.search-highlight {
  background: #FEF08A;
  color: #854D0E;
  padding: 1px 3px;
  border-radius: 2px;
  font-weight: 500;
}
html.dark .search-highlight {
  background: #713F12;
  color: #FEF08A;
}

/* ===== 7. 文章内链预览 ===== */
.link-preview-card {
  position: absolute;
  z-index: 300;
  width: 320px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  box-shadow: 0 12px 40px rgba(0,0,0,0.15);
  animation: previewFadeIn 0.2s ease;
  pointer-events: auto;
}
@keyframes previewFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.link-preview-card .preview-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}
.link-preview-card .preview-excerpt {
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.link-preview-card .preview-meta {
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: var(--color-muted);
  display: flex;
  gap: var(--space-md);
}
.link-preview-card .preview-loading {
  text-align: center;
  padding: var(--space-lg);
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ===== 10. Emoji 表情选择器 ===== */
.emoji-picker-wrapper {
  position: relative;
  margin-bottom: var(--space-md);
}
.emoji-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.82rem;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.emoji-toggle-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.emoji-panel {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 0;
  margin-bottom: 8px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  width: 320px;
  max-height: 260px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
}
.emoji-panel.active {
  display: grid;
}
.emoji-panel button {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  padding: 0;
  line-height: 1;
}
.emoji-panel button:hover {
  background: var(--color-code-bg);
  transform: scale(1.3);
}
.emoji-panel .emoji-category {
  grid-column: 1 / -1;
  font-size: 0.7rem;
  color: var(--color-muted);
  padding: 4px 2px 2px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== 8. RSS 全文阅读按钮样式 ===== */
.feed-full-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-accent) !important;
  font-weight: 600;
}

/* ===== Print: hide new UI elements ===== */
@media print {
  .back-to-top,
  .reading-progress,
  .emoji-panel,
  .link-preview-card {
    display: none !important;
  }
}

/* ===== 面包屑导航 ===== */
.breadcrumb {
  padding: var(--space-md) 0;
  font-size: 0.85rem;
  color: var(--color-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
}
.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.breadcrumb a:hover {
  color: var(--color-accent);
}
.breadcrumb-sep {
  color: var(--color-border);
  user-select: none;
  margin: 0 2px;
}
.breadcrumb span[itemprop="name"] {
  color: var(--color-text);
  font-weight: 500;
}

/* ===== 社交分享按钮 ===== */
.post-share {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
  margin-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.post-share-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-muted);
  margin-right: var(--space-sm);
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  color: var(--color-text);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.share-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}
.share-btn.copied {
  border-color: #10B981;
  color: #10B981;
  background: rgba(16,185,129,0.08);
}
.share-weibo:hover {
  border-color: #E6162D;
  color: #E6162D;
}
.share-twitter:hover {
  border-color: #000;
  color: #000;
}
html.dark .share-twitter:hover {
  border-color: #fff;
  color: #fff;
}

/* ===== 归档页标签云 ===== */
.archive-tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.tag-cloud-item {
  display: inline-block;
  color: var(--color-muted);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), transform var(--transition-fast);
  line-height: 1.6;
}
.tag-cloud-item:hover {
  color: var(--color-accent);
  transform: scale(1.08);
  background: var(--color-code-bg);
}

/* ===== 归档页描述 ===== */
.archive-description {
  font-size: 0.92rem;
  color: var(--color-muted);
  margin-top: var(--space-sm);
  line-height: 1.6;
}

/* ===== 代码块增强: Mac 标题栏 + 复制按钮 ===== */
.code-block-wrapper {
  position: relative;
  margin: var(--space-md) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.code-block-wrapper pre {
  margin: 0;
  border: none;
  border-radius: 0;
}
.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 14px;
  background: var(--color-code-bg);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.78rem;
}
.code-dots {
  display: flex;
  gap: 6px;
}
.code-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot.red    { background: #FF5F56; }
.dot.yellow { background: #FFBD2E; }
.dot.green  { background: #27C93F; }
.code-lang {
  color: var(--color-muted);
  font-weight: 600;
  text-transform: uppercase;
  margin-left: auto;
}
.code-file {
  color: var(--color-muted);
  font-style: italic;
  margin-left: var(--space-sm);
}
.code-file::before {
  content: '📄 ';
}
.copy-btn {
  position: absolute;
  top: 8px;
  right: 10px;
  padding: 3px 10px;
  font-size: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  color: var(--color-muted);
  cursor: pointer;
  z-index: 5;
  transition: all var(--transition-fast);
  opacity: 0;
}
.code-block-wrapper:hover .copy-btn {
  opacity: 1;
}
.copy-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.copy-btn.copied {
  color: #10B981;
  border-color: #10B981;
  background: rgba(16,185,129,0.08);
}

/* ===== 代码行号 ===== */
.code-line {
  display: block;
  counter-increment: line;
}
.line-no {
  display: inline-block;
  width: 2.5em;
  padding-right: 1em;
  margin-right: 1em;
  text-align: right;
  color: var(--color-muted);
  opacity: 0.5;
  user-select: none;
  border-right: 1px solid var(--color-border);
}
.code-line.highlight {
  background: rgba(var(--color-accent-rgb, 37, 99, 235), 0.08);
  display: block;
}
.code-line.highlight .line-no {
  opacity: 0.8;
  color: var(--color-accent);
}

/* ===== 置顶文章标记 ===== */
.sticky-badge {
  font-size: 0.85em;
  vertical-align: middle;
  user-select: none;
}
.post-card-sticky {
  border-left: 3px solid var(--color-accent);
  padding-left: calc(var(--space-md) - 3px);
}

/* ===== 搜索高亮 ===== */
.post-card-excerpt mark,
.post-title mark {
  background: rgba(var(--color-accent-rgb, 37, 99, 235), 0.2);
  color: var(--color-accent);
  padding: 1px 2px;
  border-radius: 2px;
}

/* ===== 友情链接网格 ===== */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}
.link-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-fast);
}
.link-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.link-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-code-bg);
}
.link-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.link-name {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.link-desc {
  font-size: 0.8rem;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}