/* ============================================================
   theme.css — 前台主题样式
   博客系统默认主题 | 支持亮色/暗色模式 | 移动端响应式
   ============================================================ */

/* ──────────────────────────────────────────────
   1. CSS 自定义属性 (Design Tokens)
   ────────────────────────────────────────────── */
:root {
  /* 主色调 */
  --color-primary:        #3b82f6;
  --color-primary-dark:   #2563eb;
  --color-primary-light:  #60a5fa;
  --color-secondary:      #1d4ed8;
  --color-accent:         #60a5fa;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --gradient-hero:    linear-gradient(135deg, #3b82f6 0%, #1d4ed8 50%, #60a5fa 100%);
  --gradient-card:    linear-gradient(145deg, rgba(59,130,246,.08) 0%, rgba(29,78,216,.08) 100%);

  /* 中性色 - 亮色模式 */
  --color-bg:           #f8f9fc;
  --color-bg-card:      #ffffff;
  --color-bg-secondary: #f1f3f8;
  --color-bg-hover:     #eef0f7;
  --color-border:       #e2e8f0;
  --color-border-light: #edf2f7;

  /* 文字色 */
  --color-text:         #1a202c;
  --color-text-muted:   #718096;
  --color-text-light:   #a0aec0;
  --color-text-link:    #3b82f6;
  --color-heading:      #2d3748;

  /* 功能色 */
  --color-success: #48bb78;
  --color-warning: #ed8936;
  --color-danger:  #fc5c7d;
  --color-info:    #4299e1;

  /* 字体 */
  --font-sans:  'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* 间距 */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* 圆角 */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-xs:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm:  0 4px 6px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.04);
  --shadow-md:  0 10px 15px rgba(0,0,0,.07), 0 4px 6px rgba(0,0,0,.05);
  --shadow-lg:  0 20px 25px rgba(0,0,0,.08), 0 10px 10px rgba(0,0,0,.04);
  --shadow-xl:  0 25px 50px rgba(0,0,0,.12);
  --shadow-primary: 0 8px 25px rgba(59,130,246,.35);

  /* 过渡 */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;

  /* 布局 */
  --container-max: 1200px;
  --header-height: 64px;
  --sidebar-width: 300px;

  /* Z-index 层级 */
  --z-base:    1;
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-header:   300;
  --z-overlay:  400;
  --z-modal:    500;
  --z-toast:    600;
}

/* 暗色模式 */
[data-theme="dark"],
body.dark-mode {
  --color-bg:           #0f1117;
  --color-bg-card:      #1a1d27;
  --color-bg-secondary: #252836;
  --color-bg-hover:     #2d3144;
  --color-border:       #2d3444;
  --color-border-light: #252836;

  --color-text:       #e2e8f0;
  --color-text-muted: #8892a4;
  --color-text-light: #606880;
  --color-heading:    #f7fafc;

  --shadow-xs: 0 1px 3px rgba(0,0,0,.3);
  --shadow-sm: 0 4px 6px rgba(0,0,0,.25);
  --shadow-md: 0 10px 15px rgba(0,0,0,.3);
  --shadow-lg: 0 20px 25px rgba(0,0,0,.35);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

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

a {
  color: var(--color-text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-dark); }

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  font-weight: 700;
  line-height: 1.3;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ──────────────────────────────────────────────
   3. 通用工具类
   ────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ──────────────────────────────────────────────
   4. 阅读进度条
   ────────────────────────────────────────────── */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-primary);
  z-index: calc(var(--z-header) + 10);
  transition: width 100ms linear;
  border-radius: 0 2px 2px 0;
}

/* ──────────────────────────────────────────────
   5. 页头 Header
   ────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: var(--z-header);
  transition: background var(--transition-normal), border-color var(--transition-normal),
              box-shadow var(--transition-normal);
}

[data-theme="dark"] .site-header,
body.dark-mode .site-header {
  background: rgba(26, 29, 39, 0.92);
  border-bottom-color: var(--color-border);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-height);
  gap: var(--space-xl);
}

/* 品牌 Logo */
.site-branding {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-img {
  height: 36px;
  width: auto;
  border-radius: var(--radius-sm);
}

.logo-text {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.3px;
}

.site-description {
  display: none;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* 主导航 */
.main-nav {
  flex: 1;
}

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

.nav-item a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-item a:hover,
.nav-item.active a {
  color: var(--color-primary);
  background: rgba(59,130,246, 0.08);
}

.nav-item.active a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

/* 头部工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

.search-toggle,
.theme-toggle,
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.search-toggle:hover,
.theme-toggle:hover,
.nav-toggle:hover {
  color: var(--color-primary);
  background: rgba(59,130,246, 0.08);
}

.nav-toggle { display: none; }

/* 头部搜索下拉 */
.header-search {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: var(--space-lg);
  z-index: var(--z-dropdown);
}

.header-search.active { display: block; }

.header-search form {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-sm);
}

.header-search input {
  flex: 1;
  height: 44px;
  padding: 0 var(--space-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.header-search input:focus {
  border-color: var(--color-primary);
}

.header-search button {
  height: 44px;
  padding: 0 var(--space-lg);
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  transition: opacity var(--transition-fast);
}

.header-search button:hover { opacity: 0.9; }

/* 移动菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.mobile-menu.active { display: block; }

.mobile-menu-inner {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--color-bg-card);
  box-shadow: var(--shadow-xl);
  padding: var(--space-xl);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

.mobile-menu.active .mobile-menu-inner {
  transform: translateX(0);
}

/* ──────────────────────────────────────────────
   6. Flash 消息提示
   ────────────────────────────────────────────── */
.flash-messages {
  position: fixed;
  top: calc(var(--header-height) + var(--space-md));
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 360px;
  width: 100%;
}

.flash {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 14px;
  font-weight: 500;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);   opacity: 1; }
}

.flash-success { background: #f0fff4; color: #276749; border-left: 4px solid var(--color-success); }
.flash-error   { background: #fff5f5; color: #9b2335; border-left: 4px solid var(--color-danger);  }
.flash-warning { background: #fffaf0; color: #7b341e; border-left: 4px solid var(--color-warning); }
.flash-info    { background: #ebf8ff; color: #2a69ac; border-left: 4px solid var(--color-info);    }

[data-theme="dark"] .flash-success { background: #1c4532; color: #9ae6b4; }
[data-theme="dark"] .flash-error   { background: #3c1120; color: #feb2b2; }
[data-theme="dark"] .flash-warning { background: #3d2209; color: #fbd38d; }
[data-theme="dark"] .flash-info    { background: #1a365d; color: #90cdf4; }

/* ──────────────────────────────────────────────
   7. 主布局 Main Layout
   ────────────────────────────────────────────── */
#main-content {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding: var(--space-2xl) 0;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-2xl);
  align-items: start;
}

.main-column {
  min-width: 0;
}

/* ──────────────────────────────────────────────
   8. 文章卡片 Post Card
   ────────────────────────────────────────────── */

/* 置顶文章 */
.sticky-posts {
  margin-bottom: var(--space-2xl);
}

.sticky-posts .post-card-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-card);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.sticky-posts .post-card-featured:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.sticky-posts .post-thumbnail {
  position: relative;
  overflow: hidden;
}

.sticky-posts .post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.sticky-posts .post-card-featured:hover .post-thumbnail img {
  transform: scale(1.05);
}

.sticky-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: 4px 10px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.sticky-posts .post-content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* 普通文章网格 */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.post-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal),
              border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(59,130,246, 0.3);
}

.post-thumbnail {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--gradient-card);
}

.post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

/* 无缩略图占位 */
.post-thumbnail-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-card);
  color: rgba(59,130,246, 0.3);
}

.post-content {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.post-category,
.post-category-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(59,130,246, 0.1);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.post-category-tag:hover {
  background: var(--color-primary);
  color: #fff;
}

.post-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
}

.post-title a {
  color: var(--color-heading);
  transition: color var(--transition-fast);
}

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

.post-excerpt {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-light);
}

.post-author {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 13px;
  color: var(--color-text-muted);
}

.author-mini-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
}

.post-stats {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 12px;
  color: var(--color-text-light);
}

.post-stats span {
  display: flex;
  align-items: center;
  gap: 3px;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.tag-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  font-size: 11px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.tag-badge:hover {
  background: rgba(59,130,246, 0.1);
  color: var(--color-primary);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  color: var(--color-text-muted);
}

.empty-state svg {
  opacity: 0.3;
  margin: 0 auto var(--space-lg);
}

.empty-state h3 {
  font-size: 18px;
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
}

/* ──────────────────────────────────────────────
   9. 文章列表视图（归档/分类/搜索）
   ────────────────────────────────────────────── */
.archive-header {
  margin-bottom: var(--space-2xl);
  padding: var(--space-2xl);
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}

.archive-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.archive-desc {
  color: var(--color-text-muted);
  font-size: 15px;
}

.archive-count {
  display: inline-block;
  margin-top: var(--space-sm);
  padding: 4px 12px;
  background: rgba(59,130,246, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-list-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-lg);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-border-light);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
              border-color var(--transition-fast);
}

.post-list-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(59,130,246, 0.3);
}

.post-list-thumb {
  display: block;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--gradient-card);
}

.post-list-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.post-list-item:hover .post-list-thumb img {
  transform: scale(1.06);
}

.post-list-body {
  padding: var(--space-md) var(--space-md) var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.post-list-body .post-title {
  font-size: 16px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
}

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

.read-more:hover::after {
  transform: translateX(3px);
}

/* ──────────────────────────────────────────────
   10. 文章详情页 Single Post
   ────────────────────────────────────────────── */
.single-post {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: 13px;
  color: var(--color-text-light);
  padding: var(--space-lg) var(--space-xl) 0;
}

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 10px;
}

/* 文章头部 */
.entry-header {
  padding: var(--space-xl);
}

.entry-cats {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.entry-cat {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(59,130,246, 0.1);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}

.entry-cat:hover {
  background: var(--color-primary);
  color: #fff;
}

.entry-title {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-heading);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.5px;
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

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

.entry-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
}

.entry-author-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
}

.entry-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 13px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.entry-info .sep {
  color: var(--color-border);
  font-size: 10px;
}

/* 特色图片 */
.entry-featured-image {
  overflow: hidden;
  max-height: 480px;
}

.entry-featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 正文内容 */
.entry-content {
  padding: var(--space-xl);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
}

.entry-content h2,
.entry-content h3,
.entry-content h4 {
  margin: 2em 0 0.8em;
  color: var(--color-heading);
}

.entry-content h2 { font-size: 22px; }
.entry-content h3 { font-size: 19px; }
.entry-content h4 { font-size: 17px; }

.entry-content p {
  margin-bottom: 1.4em;
}

.entry-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: rgba(59,130,246, 0.4);
  text-underline-offset: 3px;
}

.entry-content a:hover {
  text-decoration-color: var(--color-primary);
}

.entry-content ul,
.entry-content ol {
  margin: 0 0 1.4em 1.5em;
  list-style: revert;
}

.entry-content li { margin-bottom: 0.4em; }

.entry-content blockquote {
  margin: 1.5em 0;
  padding: var(--space-md) var(--space-xl);
  border-left: 4px solid var(--color-primary);
  background: rgba(59,130,246, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.entry-content pre {
  background: #1e2235;
  color: #e2e8f0;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  margin: 1.5em 0;
  box-shadow: var(--shadow-md);
}

.entry-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: rgba(59,130,246, 0.1);
  color: var(--color-primary-dark);
  border-radius: var(--radius-sm);
}

.entry-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 14px;
}

.entry-content img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: 1em auto;
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 14px;
}

.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-bg-secondary);
  font-weight: 600;
}

.entry-content tr:hover td {
  background: var(--color-bg-hover);
}

.entry-content hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: 2em 0;
}

/* 标签 */
.entry-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: 0 var(--space-xl) var(--space-lg);
}

.tags-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-right: var(--space-xs);
}

/* 分享 */
.entry-share {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.entry-share .share-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-right: var(--space-sm);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-bg-card);
}

.share-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59,130,246, 0.06);
}

.share-btn.share-weibo:hover  { border-color: #e6162d; color: #e6162d; background: rgba(230,22,45,.06); }
.share-btn.share-wechat:hover { border-color: #07c160; color: #07c160; background: rgba(7,193,96,.06);  }
.share-btn.share-copy:hover   { border-color: var(--color-primary); color: var(--color-primary); }

/* 作者信息框 */
.author-bio-box {
  display: flex;
  gap: var(--space-lg);
  margin: var(--space-xl);
  padding: var(--space-xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}

.author-bio-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--color-border);
}

.author-bio-info h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-heading);
}

.author-bio-info p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 上下篇导航 */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.nav-prev,
.nav-next {
  display: block;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
  color: var(--color-text);
}

.nav-prev:hover,
.nav-next:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
}

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

.nav-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.nav-prev .nav-post-title,
.nav-next .nav-post-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 相关文章 */
.related-posts {
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.section-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 20px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.related-item {
  display: block;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

.related-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(59,130,246, 0.3);
  color: var(--color-text);
}

.related-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--gradient-card);
}

.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.related-item:hover .related-thumb img {
  transform: scale(1.06);
}

.related-info {
  padding: var(--space-sm) var(--space-md);
}

.related-info h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-heading);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
}

.related-info span {
  font-size: 11px;
  color: var(--color-text-light);
}

/* ──────────────────────────────────────────────
   11. 浮动目录 TOC
   ────────────────────────────────────────────── */
.toc-float {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  max-height: calc(100vh - var(--header-height) - 80px);
  overflow-y: auto;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  font-size: 13px;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.toc-float::-webkit-scrollbar { width: 4px; }
.toc-float::-webkit-scrollbar-track { background: transparent; }
.toc-float::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  font-weight: 700;
  color: var(--color-heading);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.toc-nav {
  padding: var(--space-md);
}

.toc-nav a {
  display: block;
  padding: 5px var(--space-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.toc-nav a:hover,
.toc-nav a.active {
  color: var(--color-primary);
  background: rgba(59,130,246, 0.08);
  padding-left: 12px;
}

.toc-nav .toc-h3 { padding-left: 16px; font-size: 12px; }
.toc-nav .toc-h4 { padding-left: 28px; font-size: 11px; }

/* ──────────────────────────────────────────────
   12. 评论区 Comments
   ────────────────────────────────────────────── */
.comments-section {
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.comments-list {
  margin-bottom: var(--space-2xl);
}

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

.comment-inner {
  display: flex;
  gap: var(--space-md);
}

.comment-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
}

.comment-body {
  flex: 1;
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border-light);
  position: relative;
}

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

.comment-author {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-heading);
}

.author-badge {
  padding: 2px 8px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  border-radius: var(--radius-full);
}

.comment-time {
  font-size: 12px;
  color: var(--color-text-light);
  margin-left: auto;
}

.comment-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.comment-actions {
  margin-top: var(--space-sm);
}

.reply-btn {
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.reply-btn:hover {
  color: var(--color-primary);
  background: rgba(59,130,246, 0.08);
}

/* 子评论缩进 */
.comment-children {
  margin-top: var(--space-md);
  margin-left: var(--space-2xl);
  padding-left: var(--space-lg);
  border-left: 2px solid var(--color-border-light);
}

/* 评论表单 */
.comment-form-wrap {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
}

.comment-reply-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-lg);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 10px var(--space-md);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-size: 14px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59,130,246, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.btn-submit-comment {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px var(--space-xl);
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  transition: opacity var(--transition-fast), transform var(--transition-fast),
              box-shadow var(--transition-fast);
  box-shadow: var(--shadow-primary);
}

.btn-submit-comment:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 12px 30px rgba(59,130,246, 0.45);
}

.btn-submit-comment:active {
  transform: translateY(0);
}

/* ──────────────────────────────────────────────
   13. 侧边栏 Widgets
   ────────────────────────────────────────────── */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.widget {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-xs);
  overflow: visible;
}

.widget-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.widget-header h3 {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.widget-header h3::before {
  content: '';
  display: block;
  width: 3px;
  height: 14px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.widget-body {
  padding: var(--space-lg);
}

/* 关于我 Widget */
.author-card {
  text-align: center;
}

.author-card .author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-sm);
  border: 3px solid var(--color-primary);
  box-shadow: 0 4px 12px rgba(59,130,246, 0.3);
}

.author-card h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-xs);
}

.author-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 搜索 Widget */
.widget-search .widget-body {
  padding: var(--space-md) var(--space-lg);
}

.widget-search-form {
  display: flex;
  width: 100%;
}

.search-input-wrap {
  display: flex;
  flex: 1;
  min-width: 0;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
  box-sizing: border-box;
}

.search-input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59,130,246, 0.1);
}

.search-input-wrap input {
  flex: 1;
  min-width: 0;
  padding: 9px var(--space-md);
  border: none;
  background: var(--color-bg-card);
  color: var(--color-text);
  font-size: 14px;
  outline: none;
}

.search-input-wrap button {
  flex: 0 0 44px;
  width: 44px;
  padding: 0;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition-fast);
  border: none;
  cursor: pointer;
}

.search-input-wrap button:hover { opacity: 0.9; }

/* 最新文章 Widget */
.recent-posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.recent-post-item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.rp-thumb {
  display: block;
  width: 58px;
  height: 58px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--gradient-card);
}

.rp-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.recent-post-item:hover .rp-thumb img {
  transform: scale(1.08);
}

.rp-info {
  flex: 1;
  min-width: 0;
}

.rp-title {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-heading);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
  transition: color var(--transition-fast);
}

.rp-title:hover { color: var(--color-primary); }

.rp-date {
  font-size: 11px;
  color: var(--color-text-light);
}

/* 分类 Widget */
.category-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.category-list li > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 14px;
  transition: all var(--transition-fast);
}

.category-list li > a:hover {
  background: rgba(59,130,246, 0.08);
  color: var(--color-primary);
  padding-left: var(--space-lg);
}

.cat-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-text-light);
}

/* 标签云 Widget */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  line-height: 1;
}

.tag-item {
  display: inline-block;
  padding: 5px 10px;
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border);
}

.tag-item:hover {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

/* 最新评论 Widget */
.recent-comments-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.recent-comments-list li {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.recent-comments-list .comment-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.recent-comments-list .comment-info {
  font-size: 12px;
  line-height: 1.5;
}

.recent-comments-list .comment-info a {
  color: var(--color-text-muted);
  font-weight: 600;
}

.recent-comments-list .comment-info a:hover {
  color: var(--color-primary);
}

/* 归档 Widget */
.archive-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.archive-list li > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 14px;
  transition: all var(--transition-fast);
}

.archive-list li > a:hover {
  background: rgba(59,130,246, 0.08);
  color: var(--color-primary);
}

.archive-count {
  font-size: 11px;
  color: var(--color-text-light);
  background: var(--color-bg-secondary);
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

/* 友链 Widget */
.links-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.links-list li > a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 7px var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 14px;
  transition: all var(--transition-fast);
}

.links-list li > a::before {
  content: '↗';
  font-size: 12px;
  color: var(--color-text-light);
}

.links-list li > a:hover {
  background: rgba(59,130,246, 0.08);
  color: var(--color-primary);
}

/* ──────────────────────────────────────────────
   14. 分页导航 Pagination
   ────────────────────────────────────────────── */
.pagination {
  margin-top: var(--space-2xl);
}

.page-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.page-list li > a,
.page-list li > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
  border: 1.5px solid var(--color-border);
}

.page-list li > a {
  color: var(--color-text-muted);
  background: var(--color-bg-card);
}

.page-list li > a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59,130,246, 0.06);
}

.page-current {
  background: var(--gradient-primary) !important;
  color: #fff !important;
  border-color: transparent !important;
  box-shadow: var(--shadow-primary);
}

.page-ellipsis {
  border: none !important;
  background: none !important;
  color: var(--color-text-light) !important;
}

.page-prev,
.page-next {
  gap: 4px;
}

/* ──────────────────────────────────────────────
   15. 404 错误页
   ────────────────────────────────────────────── */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 100px);
  text-align: center;
  padding: var(--space-2xl);
}

.error-content {
  max-width: 560px;
}

.error-code {
  font-size: 120px;
  font-weight: 900;
  line-height: 1;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  letter-spacing: -5px;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

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

.btn-primary-action {
  padding: 12px var(--space-xl);
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  box-shadow: var(--shadow-primary);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-primary-action:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  color: #fff;
}

.btn-secondary-action {
  padding: 12px var(--space-xl);
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: all var(--transition-fast);
}

.btn-secondary-action:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59,130,246, 0.06);
}

.error-search form {
  display: flex;
  max-width: 360px;
  margin: 0 auto;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.error-search form:focus-within {
  border-color: var(--color-primary);
}

.error-search input {
  flex: 1;
  padding: 10px var(--space-md);
  border: none;
  background: var(--color-bg-card);
  color: var(--color-text);
  font-size: 14px;
  outline: none;
}

.error-search button {
  padding: 0 var(--space-md);
  background: var(--gradient-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: opacity var(--transition-fast);
}

.error-search button:hover { opacity: 0.9; }

/* ──────────────────────────────────────────────
   16. 页脚 Footer
   ────────────────────────────────────────────── */
.site-footer {
  background: #0f1117;
  color: #a0aec0;
  padding: var(--space-3xl) 0 0;
  margin-top: var(--space-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #f7fafc;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.footer-about .footer-logo {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.footer-about p {
  font-size: 14px;
  line-height: 1.7;
  color: #718096;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-col ul li a {
  font-size: 14px;
  color: #718096;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-col ul li a::before {
  content: '›';
  color: var(--color-primary);
  font-size: 16px;
}

.footer-col ul li a:hover { color: #f7fafc; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  font-size: 13px;
  color: #4a5568;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-bottom a {
  color: #4a5568;
  transition: color var(--transition-fast);
}

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

/* ──────────────────────────────────────────────
   17. 返回顶部按钮
   ────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: var(--z-sticky);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(59,130,246, 0.5);
}

/* ──────────────────────────────────────────────
   18. 搜索高亮
   ────────────────────────────────────────────── */
.search-highlight {
  background: rgba(59, 130, 246, 0.3);
  color: var(--color-heading);
  border-radius: 2px;
  padding: 0 2px;
}

/* ──────────────────────────────────────────────
   19. 独立页面 Page Template
   ────────────────────────────────────────────── */
.page-content {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}

.page-header {
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  background: var(--gradient-card);
  border-bottom: 1px solid var(--color-border-light);
}

.page-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: -0.4px;
}

.page-body {
  padding: var(--space-xl);
}

/* ──────────────────────────────────────────────
   20. 移动端响应式 Responsive
   ────────────────────────────────────────────── */

/* 平板 <= 1024px */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 260px;
    --container-max: 100%;
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* 中等屏幕 <= 900px */
@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .toc-float {
    position: static;
    max-height: none;
  }

  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sticky-posts .post-card-featured {
    grid-template-columns: 1fr;
  }

  .sticky-posts .post-thumbnail {
    aspect-ratio: 16/7;
  }
}

/* 移动端 <= 768px */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
    --space-2xl: 32px;
    --space-3xl: 48px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  /* 隐藏主导航，显示汉堡菜单 */
  .main-nav { display: none; }
  .nav-toggle { display: flex; }

  .header-inner { gap: var(--space-md); }

  /* 文章网格单列 */
  .posts-grid {
    grid-template-columns: 1fr;
  }

  .post-list-item {
    grid-template-columns: 100px 1fr;
    gap: var(--space-md);
  }

  /* 文章详情 */
  .entry-title { font-size: 22px; }

  .entry-content {
    padding: var(--space-lg);
    font-size: 15px;
  }

  .entry-header,
  .entry-tags,
  .entry-share,
  .post-navigation,
  .related-posts,
  .comments-section {
    padding: var(--space-lg);
  }

  .post-navigation {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .author-bio-box {
    flex-direction: column;
    margin: var(--space-lg);
    padding: var(--space-lg);
  }

  /* 侧边栏单列 */
  .sidebar {
    grid-template-columns: 1fr;
  }

  /* 评论 */
  .comment-children {
    margin-left: var(--space-lg);
    padding-left: var(--space-md);
  }

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

  /* 页脚 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

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

  /* 错误页 */
  .error-code { font-size: 80px; }
  .error-title { font-size: 22px; }
  .error-actions { flex-direction: column; align-items: center; }

  /* 返回顶部 */
  .back-to-top {
    bottom: var(--space-lg);
    right: var(--space-md);
    width: 40px;
    height: 40px;
  }

  /* Flash 消息 */
  .flash-messages {
    left: var(--space-md);
    right: var(--space-md);
    max-width: none;
  }
}

/* 小屏 <= 480px */
@media (max-width: 480px) {
  .entry-title { font-size: 20px; }

  .post-title { font-size: 15px; }

  .entry-content pre {
    font-size: 12px;
    padding: var(--space-md);
  }

  .entry-share {
    flex-wrap: wrap;
  }

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

  .page-list li > a,
  .page-list li > span {
    min-width: 34px;
    height: 34px;
    font-size: 13px;
  }

  .logo-text { font-size: 18px; }
}

/* ──────────────────────────────────────────────
   21. 打印样式
   ────────────────────────────────────────────── */
@media print {
  .site-header,
  .site-footer,
  .sidebar,
  .toc-float,
  .back-to-top,
  .post-navigation,
  .related-posts,
  .comments-section,
  .entry-share,
  .flash-messages,
  #reading-progress {
    display: none !important;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .entry-content {
    font-size: 12pt;
    line-height: 1.6;
  }

  a { color: inherit; text-decoration: none; }
}

/* ──────────────────────────────────────────────
   22. 动画与微交互
   ────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.05); }
}

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

.fade-in {
  animation: fadeIn 0.4s ease both;
}

/* 骨架屏 */
.skeleton {
  background: linear-gradient(90deg,
    var(--color-bg-secondary) 25%,
    var(--color-bg-hover) 50%,
    var(--color-bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

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

/* 图片懒加载占位 */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

img[loading="lazy"].loaded { opacity: 1; }

/* ──────────────────────────────────────────────
   23. 滚动条美化
   ────────────────────────────────────────────── */
:root {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-light);
}

/* ──────────────────────────────────────────────
   24. 辅助功能 (A11y)
   ────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@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; }
}

/* ──────────────────────────────────────────────
   25. 页面模板 (page.php) — 现代化
   ────────────────────────────────────────────── */

/* 整体卡片容器 */
.single-page {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}

/* Hero 区 */
.page-hero {
  position: relative;
  min-height: 180px;
  display: flex;
  align-items: flex-end;
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-slow);
}
.single-page:hover .page-hero-bg {
  transform: scale(1.02);
}

.page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(15,17,23,.3) 0%, rgba(15,17,23,.75) 100%);
}

/* 无特色图时的纯色 Hero */
.page-hero:not(:has(.page-hero-bg)) {
  min-height: 140px;
  background: var(--gradient-card);
  border-bottom: 1px solid var(--color-border-light);
}

.page-hero-content {
  position: relative;
  z-index: 1;
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  width: 100%;
}

/* 深色背景上的文字 */
.page-hero-content--dark .page-breadcrumb,
.page-hero-content--dark .page-breadcrumb a,
.page-hero-content--dark .page-breadcrumb span {
  color: rgba(255,255,255,.7);
}
.page-hero-content--dark .page-title {
  color: #fff;
  text-shadow: 0 2px 8px rgba(0,0,0,.3);
}
.page-hero-content--dark .page-meta,
.page-hero-content--dark .page-date {
  color: rgba(255,255,255,.65);
}

/* 面包屑（页面版） */
.page-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  padding: 0;
}
.page-breadcrumb a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.page-breadcrumb a:hover { color: var(--color-primary); }

/* 页面标题 */
.page-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-heading);
  letter-spacing: -0.5px;
  margin-bottom: var(--space-md);
}

/* 页面元信息 */
.page-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page-date {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* 正文内容 */
.page-entry-content {
  padding: var(--space-2xl) var(--space-xl);
  font-size: 16px;
  line-height: 1.9;
  border-top: none;
}

/* 页面页脚信息栏 */
.page-footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-update-hint {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-text-light);
}

.page-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  border: 1.5px solid rgba(59,130,246,.25);
  border-radius: var(--radius-full);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.page-share-btn:hover {
  background: rgba(59,130,246,.08);
  border-color: var(--color-primary);
}

/* ──────────────────────────────────────────────
   26. 侧边栏现代化增强
   ────────────────────────────────────────────── */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  max-height: calc(100vh - var(--header-height) - var(--space-2xl));
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.widget {
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}
.widget:hover {
  box-shadow: var(--shadow-sm);
}

.widget-header {
  background: transparent;
  border-bottom: 2px solid var(--color-border-light);
  padding: var(--space-md) var(--space-lg);
}
.widget-header h3 {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.widget-header h3::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 14px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* 关于我头像 */
.author-card {
  text-align: center;
}
.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-sm);
  border: 3px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.author-avatar:hover {
  transform: scale(1.06);
  box-shadow: var(--shadow-md);
}
.author-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-heading);
}
.author-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ──────────────────────────────────────────────
   27. Toast 提示
   ────────────────────────────────────────────── */
.site-toast {
  position: fixed;
  bottom: calc(var(--space-xl) + 60px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(30,34,50,.9);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  z-index: var(--z-toast);
  opacity: 0;
  transition: opacity .25s, transform .25s;
  pointer-events: none;
  white-space: nowrap;
  backdrop-filter: blur(8px);
}
.site-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ──────────────────────────────────────────────
   28. 代码块复制按钮
   ────────────────────────────────────────────── */
.code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 3px 10px;
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.8);
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  font-family: var(--font-sans);
  letter-spacing: .3px;
}
.code-copy-btn:hover {
  background: rgba(255,255,255,.22);
  color: #fff;
}

/* ──────────────────────────────────────────────
   29. 卡片入场动画
   ────────────────────────────────────────────── */
.anim-ready {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .45s ease, transform .45s ease;
}
.anim-in {
  opacity: 1;
  transform: translateY(0);
}

/* 图片懒加载淡入（覆盖原有） */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity var(--transition-normal);
}
img[loading="lazy"].img-loaded,
img[loading="lazy"].loaded {
  opacity: 1;
}

/* ──────────────────────────────────────────────
   30. 移动端 page.php 适配
   ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .page-title { font-size: 22px; }
  .page-hero-content { padding: var(--space-lg) var(--space-md); }
  .page-entry-content { padding: var(--space-xl) var(--space-md); }
  .page-footer-bar { padding: var(--space-sm) var(--space-md); }
  .sidebar { position: static; max-height: none; }
}