/* ==========================================================================
   Design Tokens
   ========================================================================== */
:root {
  /* Colors - Light Theme */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: rgba(37, 99, 235, 0.1);
  --color-success: #10b981;
  
  --bg-color: #f8fafc;
  --bg-color-alt: #f1f5f9;
  --text-color: #0f172a;
  --text-color-muted: #64748b;
  --link-color: var(--color-primary);
  
  --border-color: #e2e8f0;
  --header-bg: rgba(255, 255, 255, 0.85);
  --sidebar-bg: #ffffff;
  --card-bg: #ffffff;
  --hover-bg: #f1f5f9;
  --toc-active: var(--color-primary);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */

  /* Spacing */
  --space-1: 0.25rem;     /* 4px */
  --space-2: 0.5rem;      /* 8px */
  --space-3: 0.75rem;     /* 12px */
  --space-4: 1rem;        /* 16px */
  --space-6: 1.5rem;      /* 24px */
  --space-8: 2rem;        /* 32px */
  --space-12: 3rem;       /* 48px */
  --space-16: 4rem;       /* 64px */

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Colors - Dark Theme */
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: rgba(59, 130, 246, 0.15);
  --color-success: #34d399;

  --bg-color: #0f172a;
  --bg-color-alt: #1e293b;
  --text-color: #f1f5f9;
  --text-color-muted: #94a3b8;
  --link-color: var(--color-primary);
  
  --border-color: #334155;
  --header-bg: rgba(15, 23, 42, 0.85);
  --sidebar-bg: #1e293b;
  --card-bg: #1e293b;
  --hover-bg: #334155;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* Floating Action Buttons */
.fab-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1000;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  opacity: 0;
  visibility: hidden;
}

.fab-container.show {
  opacity: 1;
  visibility: visible;
}

.fab-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.fab-btn:hover {
  background-color: var(--hover-bg);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Font Size Classes for Body */
body.font-size-large {
  --text-base: 1.125rem;
  --text-sm: 1rem;
  --text-xs: 0.875rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 1.875rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
}

/* ==========================================================================
   Global Styles
   ========================================================================== */
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.site-header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-3) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.logo a {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
  letter-spacing: -0.025em;
  transition: color var(--transition-fast);
}

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

.search-container {
  position: relative;
  margin: 0 var(--space-4);
  flex-grow: 1;
  max-width: 400px;
}

#search-input {
  width: 100%;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-color-alt);
  color: var(--text-color);
  font-size: var(--text-sm);
  transition: all var(--transition-normal);
  outline: none;
}

#search-input:focus {
  border-color: var(--color-primary);
  background-color: var(--bg-color);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

#search-results {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  right: 0;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  display: none;
  z-index: 1001;
  padding: var(--space-2);
}

#search-results a {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-color);
  text-decoration: none;
  transition: all var(--transition-fast);
  margin-bottom: var(--space-1);
}

#search-results a:last-child {
  margin-bottom: 0;
}

#search-results a:hover {
  background-color: var(--hover-bg);
  transform: translateX(4px);
}

.site-nav {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.site-nav a {
  color: var(--text-color-muted);
  font-weight: 500;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-primary);
}

/* Nav Dropdown */
.nav-dropdown {
  position: relative;
  display: inline-block;
}

.nav-dropbtn {
  display: flex;
  align-items: center;
  background: none;
  border: none;
  color: var(--text-color-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: inherit;
  padding: 0;
  cursor: pointer;
  outline: none;
  transition: color var(--transition-fast);
}

.nav-dropbtn:hover {
  color: var(--color-primary);
}

.nav-dropbtn .arrow {
  font-size: 0.7em;
  transition: transform var(--transition-normal);
  margin-left: var(--space-1);
}

.nav-dropdown:hover .nav-dropbtn .arrow,
.nav-dropdown.active .nav-dropbtn .arrow {
  transform: rotate(180deg);
}

.nav-dropdown-content {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  background-color: var(--card-bg);
  min-width: 180px;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  border-radius: var(--radius-lg);
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px) scale(0.95);
  border: 1px solid var(--border-color);
  padding: var(--space-2);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  transform-origin: top center;
}

.nav-dropdown:hover .nav-dropdown-content,
.nav-dropdown.active .nav-dropdown-content {
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(10px) scale(1);
}

.nav-dropdown-content a {
  color: var(--text-color);
  padding: var(--space-2) var(--space-3);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-weight: 500;
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.nav-dropdown-content a:last-child {
  margin-bottom: 0;
}

.nav-dropdown-content a svg {
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.nav-dropdown-content a:hover {
  background-color: var(--hover-bg);
  color: var(--color-primary);
  transform: translateX(4px);
}

.nav-dropdown-content a:hover svg {
  opacity: 1;
  color: var(--color-primary);
}

#theme-toggle {
  background: var(--bg-color-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--text-color);
  transition: all var(--transition-normal);
}

#theme-toggle:hover {
  background: var(--hover-bg);
  transform: rotate(15deg) scale(1.1);
  box-shadow: var(--shadow-sm);
}

.site-main {
  padding: 40px 20px;
  min-height: calc(100vh - 160px);
}

/* Home Page */
.hero {
  text-align: center;
  margin-bottom: 80px;
  padding: 60px 20px;
  background: radial-gradient(circle at 50% 0%, var(--color-primary-light), transparent 70%);
  border-radius: var(--radius-xl);
}

.hero-avatar-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: var(--space-6);
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-color);
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
  transition: transform var(--transition-slow);
}

.avatar:hover {
  transform: scale(1.05) rotate(5deg);
}

.avatar-ring {
  position: absolute;
  top: -6px;
  left: -6px;
  right: -6px;
  bottom: -6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-success));
  z-index: 1;
  animation: spin 8s linear infinite;
  opacity: 0.7;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

.hero-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--text-xl);
  color: var(--text-color-muted);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}

.hero-socials {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-md);
  transition: all var(--transition-normal);
  text-decoration: none;
}

.hero-btn.primary-btn {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 14px var(--color-primary-light);
}

.hero-btn.primary-btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--color-primary-light);
  text-decoration: none;
}

.hero-btn.secondary-btn {
  background: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.hero-btn.secondary-btn:hover {
  background: var(--hover-bg);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  text-decoration: none;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: var(--space-3);
}

.section-header .section-title {
  margin-bottom: 0;
}

.section-header .section-title::after {
  display: none;
}

.view-all {
  font-weight: 600;
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.view-all:hover {
  transform: translateX(4px);
  text-decoration: none;
}

/* Home and List Pages Layout */
.list-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.list-sidebar {
  position: relative;
}

.sidebar-widget {
  background-color: var(--sidebar-bg);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 30px;
}

.sidebar-widget h3 {
  margin-top: 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  font-size: 1.2rem;
}

/* Sidebar Categories */
.categories-list-sidebar {
  list-style: none;
  padding-left: 0;
}

.category-item {
  margin-bottom: 10px;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 5px;
}

.category-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.category-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 8px 0;
  min-height: 44px; /* Touch target */
}

.category-item-header > a {
  font-weight: bold;
  font-size: 1.1rem;
  flex-grow: 1;
}

.category-item-header > .count {
  color: #888;
  font-size: 0.9rem;
  margin-right: 10px;
}

.toggle-sub-category {
  font-size: 0.8rem;
  transition: transform 0.3s;
}

.toggle-sub-category.open {
  transform: rotate(180deg);
}

.recent-in-category-sidebar {
  list-style: none;
  padding-left: 15px;
  margin-top: 0;
  margin-bottom: 10px;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  max-height: 1000px;
}

.recent-in-category-sidebar.collapsed {
  max-height: 0;
  margin-bottom: 0;
}

.recent-in-category-sidebar li a {
  display: block;
  padding: 8px 0;
  min-height: 44px; /* Touch target */
  font-size: 0.95rem;
  color: var(--text-color);
}

.recent-in-category-sidebar li a.active {
  color: var(--toc-active);
  font-weight: bold;
}

.recent-in-category-sidebar li a:hover {
  color: var(--toc-active);
}

/* Sidebar Archives */
.archives-content-sidebar {
  max-height: 400px;
  overflow-y: auto;
}

.archive-group-sidebar {
  margin-bottom: 20px;
}

.archive-month-sidebar {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--link-color);
  font-size: 1.05rem;
}

.archive-list-sidebar {
  list-style: none;
  padding-left: 10px;
  margin: 0;
}

.archive-list-sidebar li a {
  display: block;
  padding: 8px 0;
  min-height: 44px; /* Touch target */
}

.archive-list-sidebar .date {
  color: #888;
  min-width: 45px;
  display: inline-block;
  padding-top: 8px;
}

.hidden-archive {
  display: none;
}

.load-more-btn {
  width: 100%;
  padding: 10px;
  background: var(--hover-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  min-height: 44px;
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-color);
  transition: background 0.3s;
}

.load-more-btn:hover {
  background: var(--border-color);
}

/* Global Animations */
.fade-in {
  animation: fadeIn 0.6s ease-out forwards;
  opacity: 0;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-title {
  font-size: 2rem;
  margin-bottom: 30px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 40%;
  height: 3px;
  background-color: var(--link-color);
  border-radius: 2px;
}

/* Post Cards Refined */
.post-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
  justify-content: center;
}

/* Ensure cards don't stretch too wide when there's only 1 or 2 items */
@media (min-width: 1024px) {
  .home-container .post-cards {
    grid-template-columns: repeat(3, minmax(320px, 1fr));
    max-width: 1200px;
    margin: 0 auto;
  }
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  will-change: transform;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-success));
  opacity: 0;
  transition: opacity var(--transition-normal), height var(--transition-normal);
}

.card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  border-color: transparent;
}

.card:hover::before {
  opacity: 1;
  height: 6px;
}

.card h3 {
  margin-top: 0;
  font-size: var(--text-2xl);
  line-height: 1.4;
  margin-bottom: var(--space-4);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.card h3 a {
  color: var(--text-color);
  transition: color var(--transition-fast);
}

.card h3 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.meta {
  font-size: var(--text-sm);
  color: var(--text-color-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.meta time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.tag {
  background-color: var(--bg-color-alt);
  color: var(--text-color-muted);
  padding: 4px var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.tag:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

.summary {
  color: var(--text-color-muted);
  margin-bottom: var(--space-6);
  flex-grow: 1;
  line-height: 1.6;
}

.read-more {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  align-self: flex-start;
  position: relative;
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.read-more::after {
  content: '→';
  margin-left: var(--space-2);
  transition: transform var(--transition-fast);
}

.read-more:hover {
  text-decoration: none;
  background-color: var(--color-primary);
  color: white;
}

.read-more:hover::after {
  transform: translateX(4px);
}

/* Pagination Styling */
.pagination {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  margin: var(--space-12) 0 var(--space-6) 0;
  gap: var(--space-2);
}

.pagination .page-item {
  margin: 0;
}

.pagination .page-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-3);
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-color-muted);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
  font-size: var(--text-sm);
}

.pagination .page-link:hover {
  background-color: var(--hover-bg);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.pagination .page-item.active .page-link {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.pagination .page-item.disabled .page-link {
  opacity: 0.5;
  pointer-events: none;
  background-color: var(--bg-color-alt);
}

/* Post Page Layout */
.post-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  position: relative;
}

.post-layout.three-column {
  grid-template-columns: 320px minmax(0, 1fr) 320px;
  gap: var(--space-8);
  max-width: 1600px;
  margin: 0 auto;
}

.post-sidebar-left,
.post-sidebar-right {
  position: relative;
  display: block; /* 回退为 block，防止 flex 导致粘性定位失效 */
}

.post-content-container {
  min-width: 0; /* Prevents CSS Grid blow-out */
  width: 100%;
}

/* ==========================================================================
   Post Content Typography & Components
   ========================================================================== */
.post-content {
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-color);
}

.post-content p {
  margin-bottom: var(--space-6);
  text-align: justify; /* 两端对齐，排版更整齐 */
}

/* 列表排版优化 */
.post-content ul, 
.post-content ol {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
  line-height: 1.8;
}

.post-content li {
  margin-bottom: var(--space-2);
}

.post-content li > p {
  margin-bottom: var(--space-2); /* 列表内段落间距减小 */
}

.post-content h2, 
.post-content h3, 
.post-content h4 {
  color: var(--text-color);
  font-weight: 700;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  line-height: 1.3;
}

.post-content h2 { font-size: var(--text-3xl); border-bottom: 1px solid var(--border-color); padding-bottom: var(--space-2); }
.post-content h3 { font-size: var(--text-2xl); }
.post-content h4 { font-size: var(--text-xl); }

/* Image Figure Styles */
.post-figure {
  margin: var(--space-6) 0;
  text-align: center;
}

.post-figure .post-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
  display: block;
}

.post-figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-color-muted);
  font-style: italic;
}

.post-content blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-color-muted);
  font-style: italic;
}

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

.post-content code {
  font-family: var(--font-mono);
  background-color: var(--bg-color-alt);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: #d63384; /* 更醒目的颜色，避免与链接冲突 */
  border: 1px solid var(--border-color);
  word-break: break-word;
}

[data-theme="dark"] .post-content code {
  color: #ff79c6; /* 暗黑模式下的高对比度颜色 */
  background-color: rgba(255, 255, 255, 0.05);
}

.post-content pre code {
  background-color: transparent;
  padding: 0;
  border: none;
  color: inherit;
  font-size: 0.95em; /* 稍微放大代码块中的字体 */
  line-height: 1.5;
}

.post-content pre {
  max-width: 100%;
  overflow-x: auto;
  background-color: #1e1e1e; /* 保持暗色调与 Prism Tomorrow 兼容 */
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin: var(--space-6) 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1), var(--shadow-md);
  color: #f8f8f2; /* 确保代码块默认文字颜色清晰 */
}

.post-content table {
  width: 100%;
  max-width: 100%;
  display: block;
  overflow-x: auto;
  margin: var(--space-6) 0;
  border-collapse: collapse;
}

.post-content th,
.post-content td {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-color);
}

.post-content th {
  background-color: var(--bg-color-alt);
  font-weight: 600;
  text-align: left;
}

/* Scrollbar styling for code blocks and tables */
.post-content pre::-webkit-scrollbar,
.post-content table::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

.post-content pre::-webkit-scrollbar-track,
.post-content table::-webkit-scrollbar-track {
  background: var(--hover-bg);
  border-radius: 4px;
}

.post-content pre::-webkit-scrollbar-thumb,
.post-content table::-webkit-scrollbar-thumb {
  background-color: #888;
  border-radius: 4px;
}

.post-content pre::-webkit-scrollbar-thumb:hover,
.post-content table::-webkit-scrollbar-thumb:hover {
  background-color: #555;
}

.page-layout {
  display: block;
  max-width: 800px;
  margin: 0 auto;
}

.post-header {
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--space-6);
}

.post-navigation {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-color);
  gap: var(--space-6);
}

.nav-prev, .nav-next {
  flex: 1;
  display: flex;
}

.nav-next {
  justify-content: flex-end;
}

.post-navigation a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-color);
  transition: all var(--transition-normal);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--text-sm);
  line-height: 1.4;
  max-width: 100%;
}

.post-navigation a:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.author-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid var(--border-color);
}

.author-name {
  font-weight: 700;
  font-size: var(--text-lg);
}

.post-title {
  font-size: var(--text-4xl);
  margin: 0 0 var(--space-3) 0;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.3;
}

.post-sidebar {
  position: relative;
}

.sidebar-author-info {
  background-color: var(--sidebar-bg);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
  position: relative; /* Remove static positioning to flow normally */
}

.sidebar-avatar {
  width: 96px;
  height: 96px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 4px solid var(--bg-color);
  margin-bottom: var(--space-3);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  box-shadow: 0 0 0 1px var(--border-color), var(--shadow-md);
}

.sidebar-avatar:hover {
  transform: scale(1.05) rotate(3deg);
  box-shadow: 0 0 0 2px var(--color-primary), var(--shadow-lg);
}

.sidebar-author-name {
  font-weight: 800;
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  color: var(--text-color);
}

.github-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  background-color: var(--text-color);
  color: var(--bg-color);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.github-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--bg-color);
  text-decoration: none;
}

.toc-container {
  position: sticky;
  top: calc(100px + var(--space-16)); /* 进一步增大 top 距离，确保无论怎样滚动顶部圆角都不会被导航栏遮挡 */
  background-color: var(--sidebar-bg);
  padding: var(--space-6) var(--space-6) 0 var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  max-height: calc(100vh - 160px); /* 相应减少高度防止撑到底部 */
  overflow-y: auto;
  overflow-x: hidden;
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
  width: 100%;
}

/* 伪元素确保底部留白能被滚动条识别，防止最后一项内容显示不全（少一点点） */
.toc-container::after {
  content: "";
  display: block;
  height: var(--space-6);
  width: 100%;
}

/* Ensure bottom content isn't cut off by scroll area padding */
.toc-container > *:last-child {
  margin-bottom: 0;
}

.toc-container.toc-right {
  max-height: calc(100vh - 160px); /* 保持一致高度 */
}

.toc-category-name {
  display: flex;
  align-items: center;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-color);
  white-space: normal;
  word-break: break-word;
  width: 100%;
  box-sizing: border-box;
}

.toc-category-name svg {
  flex-shrink: 0;
}

.toc-category-posts {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  box-sizing: border-box;
  padding-bottom: var(--space-4); /* Add explicit padding at bottom for safe scroll */
}

.toc-subcategory-group {
  margin-bottom: var(--space-1);
  width: 100%;
  box-sizing: border-box;
}

.toc-subcategory-title {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-color);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  user-select: none;
  white-space: normal;
  word-break: break-word;
  width: 100%;
  box-sizing: border-box;
}

.toc-subcategory-title:hover {
  background-color: var(--hover-bg);
}

.toc-subcategory-title .folder-icon {
  margin-right: var(--space-2);
  color: var(--color-primary);
  flex-shrink: 0;
}

.toc-subcategory-title .subcat-name {
  flex-grow: 1;
}

.toc-subcategory-title .chevron-icon {
  transition: transform var(--transition-fast);
  color: var(--text-color-muted);
  flex-shrink: 0;
}

.toc-subcategory-group.open .toc-subcategory-title .chevron-icon {
  transform: rotate(90deg);
}

.toc-subcategory-content {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding-left: var(--space-4);
  margin-top: var(--space-1);
  border-left: 1px solid var(--border-color);
  margin-left: calc(var(--space-3) + 7px);
  width: calc(100% - var(--space-3) - 7px);
  box-sizing: border-box;
}

.toc-subcategory-group.open .toc-subcategory-content {
  display: flex;
  animation: fadeIn 0.3s ease-in-out;
}

.toc-post-item {
  display: flex;
  flex-direction: column;
  width: 100%;
  box-sizing: border-box;
}

.toc-post-link {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-color);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.4;
  border: 1px solid transparent;
  white-space: normal;
  word-break: break-word;
  box-sizing: border-box;
  width: 100%;
}

.toc-post-link:hover {
  background-color: var(--hover-bg);
  color: var(--color-primary);
}

.toc-post-item.active .toc-post-link {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  border-color: rgba(37, 99, 235, 0.2);
}

.toc-post-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: var(--space-4);
  line-height: 1.4;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-color);
  white-space: normal;
  word-break: break-word;
  width: 100%;
  box-sizing: border-box;
}

.toc-content-wrapper {
  margin-top: var(--space-2);
  padding-left: var(--space-4);
  padding-bottom: var(--space-4);
  border-left: 1px solid var(--border-color);
  margin-left: var(--space-4);
  width: calc(100% - var(--space-4));
  box-sizing: border-box;
}

.toc-content-wrapper h3 {
  display: none; /* Hide default TOC title if generated by hugo */
}

.toc-container ul {
  list-style: none;
  padding-left: var(--space-3);
  margin: 0;
}

.toc-container > .toc-content-wrapper > nav > ul {
  padding-left: 0;
}

.toc-container a {
  color: var(--text-color-muted);
  text-decoration: none;
  display: block;
  padding: var(--space-1) 0;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
  padding-left: var(--space-2);
  margin-left: calc(var(--space-2) * -1);
  white-space: normal;
  word-break: break-word;
  line-height: 1.4;
  box-sizing: border-box;
  width: calc(100% + var(--space-2));
}

.toc-container a:hover, .toc-container a.active {
  color: var(--color-primary);
  font-weight: 600;
  border-left-color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.toc-toggle {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--link-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 20px;
  z-index: 1002;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.site-footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
}

/* Comments */
.comments {
  margin-top: var(--space-12);
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-8);
}

.comments h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--text-color);
  position: relative;
  display: inline-block;
}

.comments h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 40px;
  height: 4px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

#giscus-container {
  min-height: 250px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-color-alt);
  padding: var(--space-4);
  box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.02);
}

/* Categories and Archives */
.terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.term-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
}

.term-title {
  margin-top: 0;
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.term-title .count {
  color: #888;
  font-size: 1rem;
}

.term-recent {
  list-style: none;
  padding-left: 0;
}

.term-recent li {
  margin-bottom: 10px;
  display: flex;
  gap: 10px;
}

.term-recent .date {
  color: #888;
  font-size: 0.9rem;
  min-width: 50px;
}

.more-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.9rem;
}

.archives-timeline {
  margin-top: 30px;
  border-left: 2px solid var(--border-color);
  padding-left: 20px;
}

.archive-group {
  margin-bottom: 40px;
}

.archive-month {
  font-size: 1.8rem;
  margin-bottom: 15px;
  position: relative;
}

.archive-month::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background-color: var(--link-color);
  border-radius: 50%;
  border: 2px solid var(--bg-color);
}

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

.archive-list li {
  margin-bottom: 15px;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 15px;
}

.archive-list .date {
  color: #888;
  font-size: 0.9rem;
}

/* Post Footer Widgets (Categories & Archives) */
.post-footer-widgets {
  margin-top: 50px;
  border-top: 1px solid var(--border-color);
  padding-top: 30px;
}

.widget-categories h3, .widget-archives h3 {
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.categories-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.category-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
}

.category-card h4 {
  margin-top: 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.recent-in-category {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

.recent-in-category li {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.recent-in-category .date {
  color: #888;
  min-width: 45px;
}

.widget-archives {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.archives-header {
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background-color: var(--hover-bg);
  transition: background-color 0.2s;
}

.archives-header:hover {
  background-color: var(--border-color);
}

.archives-header h3 {
  margin: 0;
}

.archives-header .toggle-icon {
  transition: transform 0.3s;
}

.archives-header.open .toggle-icon {
  transform: rotate(180deg);
}

.archives-content {
  padding: 0 20px;
  max-height: 500px;
  overflow-y: auto;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
}

.archives-content.collapsed {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.archive-group h4 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--link-color);
}

/* ==========================================================================
   Page Transitions & Loading
   ========================================================================== */
#nprogress {
  pointer-events: none;
}
#nprogress .bar {
  background: var(--color-primary);
  position: fixed;
  z-index: 1031;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
}
#nprogress .peg {
  display: block;
  position: absolute;
  right: 0px;
  width: 100px;
  height: 100%;
  box-shadow: 0 0 10px var(--color-primary), 0 0 5px var(--color-primary);
  opacity: 1.0;
  transform: rotate(3deg) translate(0px, -4px);
}

body.loading-page main {
  opacity: 0.6;
  pointer-events: none;
  filter: blur(2px);
  transform: scale(0.99);
}

main {
  transition: opacity var(--transition-normal), filter var(--transition-normal), transform var(--transition-normal);
  will-change: opacity, filter, transform;
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--bg-color-alt) 25%, var(--border-color) 50%, var(--bg-color-alt) 75%);
  background-size: 200% 100%;
  animation: skeletonLoading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeletonLoading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Category Tree Page */
.category-tree-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.category-group {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.category-group:hover {
  box-shadow: var(--shadow-md);
}

.category-header {
  padding: var(--space-4) var(--space-6);
  cursor: pointer;
  user-select: none;
  background-color: var(--card-bg);
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid transparent;
  outline: none;
}

.category-header:focus-visible {
  box-shadow: inset 0 0 0 2px var(--color-primary);
}

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

.category-group.open .category-header {
  border-bottom-color: var(--border-color);
  background-color: var(--bg-color-alt);
}

.category-title {
  display: flex;
  align-items: center;
  font-size: var(--text-xl);
  font-weight: 700;
  margin: 0;
  color: var(--text-color);
}

.category-title .folder-icon {
  margin-right: var(--space-3);
  color: var(--color-primary);
}

.category-title span {
  flex-grow: 1;
}

.category-title .chevron-icon {
  transition: transform var(--transition-normal);
  color: var(--text-color-muted);
}

.category-group.open .chevron-icon {
  transform: rotate(180deg);
}

.category-content {
  display: none;
  padding: var(--space-6);
  background-color: var(--bg-color);
}

.category-group.open .category-content {
  display: block;
  animation: slideDown 0.3s ease-out forwards;
}

.subcategory-group {
  margin-bottom: var(--space-6);
  padding-left: var(--space-4);
  border-left: 2px solid var(--border-color);
}

.subcategory-group:last-child {
  margin-bottom: 0;
}

.subcategory-title {
  display: flex;
  align-items: center;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-color);
  margin: 0 0 var(--space-4) 0;
  cursor: pointer;
  user-select: none;
  outline: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.subcategory-title:focus-visible {
  box-shadow: 0 0 0 2px var(--color-primary);
}

.subcategory-title:hover {
  background-color: var(--hover-bg);
}

.subcategory-group .category-posts {
  display: none;
}

.subcategory-group.open .category-posts {
  display: block;
  animation: slideDown 0.3s ease-out forwards;
}

.subcategory-group.open .chevron-icon-sub {
  transform: rotate(180deg);
}

.subcategory-title svg {
  margin-right: var(--space-2);
  color: var(--color-primary);
}

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

.category-posts.direct-posts {
  margin-bottom: var(--space-6);
}

.category-posts .post-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.category-posts .post-item:hover {
  background-color: var(--hover-bg);
}

.category-posts .post-date {
  font-size: var(--text-sm);
  color: var(--text-color-muted);
  width: 90px;
  flex-shrink: 0;
  font-family: monospace;
}

.category-posts .post-link {
  font-size: var(--text-md);
  color: var(--text-color);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: normal;
  word-break: break-word;
}

.category-posts .post-link:hover {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .category-posts .post-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .category-posts .post-date {
    margin-bottom: var(--space-1);
  }
}

/* Responsive */
.mobile-sidebar-toggle {
  display: none;
  width: 100%;
  padding: 12px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 16px;
  cursor: pointer;
  text-align: center;
  color: var(--text-color);
  min-height: 44px; /* Touch target */
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
}

.close-sidebar-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 24px;
  cursor: pointer;
  position: absolute;
  top: 10px;
  right: 15px;
  padding: 10px; /* Touch target */
}

@media (max-width: 1400px) {
  .post-layout.three-column {
    grid-template-columns: 280px minmax(0, 1fr) 280px;
    gap: var(--space-6);
  }
}

@media (max-width: 1200px) {
  .post-layout.three-column {
    grid-template-columns: 240px minmax(0, 1fr) 240px;
    gap: var(--space-4);
  }
}

@media (max-width: 1024px) {
  .list-layout {
    grid-template-columns: 1fr 280px;
    gap: var(--space-6);
  }
  .post-layout {
    grid-template-columns: 1fr 280px;
    gap: var(--space-6);
  }
  .post-layout.three-column {
    grid-template-columns: 1fr 280px; /* 退化为两栏 */
  }
  .post-layout.three-column .post-sidebar-left {
    display: none; /* 平板隐藏左侧，只留右侧目录 */
  }
  .post-cards {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .site-header {
    padding: var(--space-2) 0;
  }
  
  .post-layout, .list-layout, .post-layout.three-column {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .post-sidebar-left,
  .post-sidebar-right {
    display: none; /* Hidden by default on mobile */
  }

  .mobile-sidebar-toggle {
    display: block;
    margin-bottom: var(--space-4);
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: background-color var(--transition-fast);
  }
  
  .mobile-sidebar-toggle:active {
    background-color: var(--hover-bg);
  }
  
  .list-sidebar {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-color);
    z-index: 1000;
    overflow-y: auto;
    transition: right var(--transition-normal);
    padding: var(--space-16) var(--space-4) var(--space-4) var(--space-4);
    box-shadow: -10px 0 30px rgba(0,0,0,0.1);
  }

  .list-sidebar.open {
    right: 0;
  }

  .sidebar-overlay.show {
    display: block;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }

  .close-sidebar-btn {
    display: block;
    top: var(--space-4);
    right: var(--space-4);
    background-color: var(--bg-color-alt);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
  }
  
  .close-sidebar-btn:active {
    transform: scale(0.9);
  }
  
  .post-sidebar-left.show-toc,
  .post-sidebar-right.show-toc {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1001;
    animation: fadeIn 0.3s ease-out;
  }
  
  .post-sidebar-left.show-toc .toc-container,
  .post-sidebar-right.show-toc .toc-container {
    position: absolute;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 70vh;
    padding-bottom: var(--space-6); /* 给移动端弹出的目录底部多加点内边距 */
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    background-color: var(--bg-color);
    box-shadow: 0 -10px 40px rgba(0,0,0,0.2);
    transform: translateY(100%);
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }
  
  @keyframes slideUp {
    to { transform: translateY(0); }
  }
  
  .toc-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    bottom: var(--space-6);
    width: 50px;
    height: 50px;
    padding: 0;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast);
    z-index: 1002;
  }

  .toc-toggle.right {
    right: var(--space-6);
  }

  .toc-toggle.left {
    left: var(--space-6);
  }
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast);
  }
  
  .toc-toggle:active {
    transform: scale(0.9);
  }
  
  .header-container {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .search-container {
    width: 100%;
    margin: 0;
    max-width: 100%;
  }
  
  .site-nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-4);
  }
}

/* Markdown List Styling */
.post-content ul,
.post-content ol,
.page-content ul,
.page-content ol {
  padding-left: 2em;
  margin-bottom: 1.5em;
  list-style-position: outside;
}

.post-content li,
.page-content li {
  margin-bottom: 0.5em;
  line-height: 1.6;
  display: list-item;
}

.post-content ul > li,
.page-content ul > li {
  list-style-type: disc;
}

.post-content ul > li > ul > li,
.page-content ul > li > ul > li {
  list-style-type: circle;
}

.post-content ul > li > ul > li > ul > li,
.page-content ul > li > ul > li > ul > li {
  list-style-type: square;
}

.post-content ol > li,
.page-content ol > li {
  list-style-type: decimal;
}

.post-content ol > li > ol > li,
.page-content ol > li > ol > li {
  list-style-type: lower-alpha;
}

.post-content ol > li > ol > li > ol > li,
.page-content ol > li > ol > li > ol > li {
  list-style-type: lower-roman;
}

.post-content li > p,
.page-content li > p {
  margin-top: 0;
  margin-bottom: 0.5em;
}

/* Code Block Copy Button */
.code-block-wrapper {
  position: relative;
  margin-bottom: 1.5em;
}

.code-block-wrapper pre {
  margin-bottom: 0;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 6px 10px;
  font-size: 0.8rem;
  color: var(--text-color);
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, background-color 0.2s, color 0.2s;
  z-index: 10;
}

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

.copy-btn:hover {
  background-color: var(--hover-bg);
}

.copy-btn.copied {
  background-color: #4caf50;
  color: white;
  border-color: #4caf50;
}

/* Graceful Degradation / Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .fade-in {
    animation: none !important;
    opacity: 1 !important;
  }
}