/*
 * WeChan Theme - 微信公众号风格 Typecho 主题
 * 版本：2.10.4
 * ================================================
 * 设计理念：清洁、克制、阅读优先
 * 参考：微信公众号文章页风格
 * v2.10.0 优化：全站字体栈 + 文章页 clamp() 响应式字体
 */

/* ================================================
   1. CSS 变量 & 主题
   ================================================ */
:root {
  /* 颜色 */
  --bg:             #ffffff;
  --bg-secondary:   #f7f8fa;
  --bg-card:        #ffffff;
  --bg-code:        #f6f8fa;
  --text:           #1a1a1a;
  --text-secondary: #595959;
  --text-muted:     #8c8c8c;
  --border:         #ebebeb;
  --border-strong:  #d9d9d9;
  --accent:         #07c160;
  --accent-hover:   #06ad56;
  --accent-light:   rgba(7, 193, 96, 0.1);
  --progress-color: #07c160;
  --link:           #576b95;
  --link-hover:     #3d5180;
  --danger:         #e03e3e;

  /* 分类标签变量（补充缺失） */
  --primary:        #07c160;
  --tag-bg:         rgba(7, 193, 96, 0.1);
  /* 阴影 */
  --shadow-sm:  0 1px 4px rgba(0,0,0,0.06);
  --shadow:     0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.12);

  /* 尺寸 */
  --radius-sm:  4px;
  --radius:     8px;
  --radius-lg:  12px;
  --max-width:  1100px;

  /* 字体栈优化（跨平台最佳显示） */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* 响应式字体变量 */
  --font-size-post: clamp(0.9375rem, 1.5vw, 1.0625rem);
  --font-size-title: clamp(1.5rem, 5vw, 2.1rem);

  /* 过渡 */
  --transition: .2s ease;
}

[data-theme="dark"] {
  --bg:             #1a1a1a;
  --bg-secondary:   #222222;
  --bg-card:        #252525;
  --bg-code:        #2d2d2d;
  --text:           #e6e6e6;
  --text-secondary: #b0b0b0;
  --text-muted:     #737373;
  --border:         #333333;
  --border-strong:  #444444;
  --accent:         #07c160;
  --accent-light:   rgba(7, 193, 96, 0.15);
  --link:           #7fa3d0;
  --link-hover:     #9dbde0;
  --bg-code:        #2a2a2a;
  /* 分类标签变量（暗色适配） */
  --primary:        #07c160;
  --tag-bg:         rgba(7, 193, 96, 0.25);
}

/* ================================================
   2. 重置 & 基础
   ================================================ */
*, ::before, ::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden; /* 防止任何元素撑出视口导致横向滚动 */
  max-width: 100vw;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden; /* 防止横向溢出（iOS Safari 双重防护）*/
  max-width: 100%;
}

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

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

ul, ol { list-style: none; }

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

/* ================================================
   2.5 阅读进度条
   ================================================ */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.05);
  pointer-events: none;
  padding-top: env(safe-area-inset-top, 0px);
  box-sizing: content-box;
}

.reading-progress-bar {
  height: 3px;
  width: 0%;
  background: var(--progress-color);
  transition: width 0.1s ease-out;
  border-radius: 0 2px 2px 0;
}

[data-theme="dark"] .reading-progress {
  background: rgba(255, 255, 255, 0.1);
}

/* iOS 安全区域支持 - 导航栏 */
@supports (padding-top: env(safe-area-inset-top)) {
  .site-header {
    padding-top: env(safe-area-inset-top, 0px);
  }
  
  .site-header .container {
    height: auto;
    min-height: 62px;
    padding-top: 8px;
    padding-bottom: 8px;
  }
}

/* ================================================
   3. 布局
   ================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding: 48px 0;
  align-items: start;
  overflow-x: hidden;
}

.main-content {
  overflow-x: hidden;
  min-width: 0;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 32px 0;
  }
  .sidebar { display: none; }
}

/* ================================================
   4. 顶部导航
   ================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

[data-theme="dark"] .site-header {
  background: rgba(26,26,26,0.92);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  height: 62px;
  flex-shrink: 0;
  overflow: hidden; /* 防止子元素撑破导航栏 */
}

.site-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
  min-width: 0;       /* flex 子元素允许收缩 */
  flex-shrink: 1;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-logo:hover { color: var(--accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0; /* 导航按钮不缩小 */
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.site-nav a:hover { color: var(--text); }

/* 明暗切换按钮 */
.theme-toggle, .search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.theme-toggle:hover, .search-toggle:hover {
  color: var(--text);
  background: var(--bg-secondary);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun  { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* 搜索栏 */
.search-bar {
  border-top: 1px solid var(--border);
  background: var(--bg);
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s ease;
}
.search-bar.open {
  max-height: 80px;
  padding: 12px 0;
}
.search-bar form {
  display: flex;
  gap: 8px;
}
.search-bar input {
  flex: 1;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
}
.search-bar input:focus { border-color: var(--accent); }
.search-bar button {
  padding: 8px 14px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  transition: background var(--transition);
}
.search-bar button:hover { background: var(--accent-hover); }

/* ================================================
   5. 文章卡片（首页列表）
   ================================================ */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), transform var(--transition);
  margin-bottom: 24px;
}
.post-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.post-card-cover {
  display: block;
  overflow: hidden;
  height: 200px;
}
.post-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.post-card:hover .post-card-cover img {
  transform: scale(1.04);
}

.post-card-body {
  padding: 24px;
}

.post-card-cats {
  margin-bottom: 10px;
}
.post-card-cats a {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-light);
  padding: 2px 10px;
  border-radius: 20px;
  margin-right: 6px;
  font-weight: 500;
}

.post-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.post-card-title a {
  color: var(--text);
  transition: color var(--transition);
}
.post-card-title a:hover { color: var(--accent); }

.post-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.post-meta-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.post-date, .post-read-time, .post-author {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-read-more {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  padding: 6px 14px;
  border: 1px solid var(--accent);
  border-radius: 20px;
  transition: all var(--transition);
}
.post-read-more:hover {
  background: var(--accent);
  color: #fff;
}

/* ================================================
   6. 分页
   ================================================ */
.pagination {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}
.pagination .page-navigator {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
/* 所有 li 项基础按钮样式 */
.pagination .page-navigator li a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
/* a 内部的 span（上一页/下一页文字） */
.pagination .page-navigator li a span {
  pointer-events: none;
}
/* 悬停 */
.pagination .page-navigator li a:hover {
  border-color: var(--accent);
  color: var(--accent);
}
/* 当前页 */
.pagination .page-navigator li.current a {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
/* 上一页 / 下一页按钮宽度不限 */
.pagination .page-navigator li.prev a,
.pagination .page-navigator li.next a {
  padding: 0 16px;
}

/* ================================================
   7. 单篇文章
   ================================================ */
/* 文章页头部（mdnice 风格） */
.post-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

/* 文章标题 */
.post-title {
  font-size: var(--font-size-title);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.5px;
  color: var(--text);
  word-break: break-word;
  overflow-wrap: break-word;
}

@media (max-width: 640px) {
  .post-title { font-size: 1.65rem; }
}

/* 作者信息栏（桌面一行，移动两行） */
.post-author-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  font-size: 0.85rem;
  color: #666;
  margin-top: 14px;
  row-gap: 6px;
}
/* 每行容器：内联 flex，内部元素左对齐 */
.meta-row {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  flex-wrap: nowrap;
}
/* 桌面：两行之间加分隔点 */
.meta-row-1::after {
  content: '·';
  margin: 0 6px;
  opacity: 0.4;
}
.meta-icon {
  display: inline-flex;
  align-items: center;
  margin-right: 4px;
  opacity: 0.5;
}
.author-name {
  font-weight: 600;
  color: var(--accent, #576af6);
}
.post-time {
  color: #666;
}
.read-time {
  color: #666;
}
.comments-count {
  color: #666;
}
.meta-dot {
  margin: 0 6px;
  opacity: 0.4;
}

/* 内联分类标签（在作者信息栏中） */
.post-category-tag a {
  display: inline-block;
  font-size: 0.72rem;
  color: #fff;
  background: #576af6;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.3px;
  transition: all 0.2s ease;
}
.post-category-tag a:hover {
  background: #4050e0;
  color: #fff;
}

.comments-count {
  color: #576af6;
}

/* ================================================
   7.1 全平台响应式适配
   ================================================ */

/* 平板适配 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
  .container {
    padding: 0 32px;
  }

  .post-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
  }

  .post-title {
    font-size: 1.85rem;
  }

  .post-author-bar {
    font-size: 0.82rem;
  }

  .post-content {
    font-size: 1rem;
    line-height: 1.85;
  }

  .post-content h2 {
    font-size: 1.25rem;
  }

  .post-content h3 {
    font-size: 1.1rem;
  }

  .post-tags {
    margin: 28px 0;
  }

  .post-copyright {
    margin: 28px 0;
    padding: 16px 20px;
  }

  .post-navigation {
    margin: 28px 0;
    padding: 20px;
  }
}

/* 手机适配 (375px - 640px) */
@media (max-width: 640px) {
  .container {
    padding: 0 14px;
  }

  .site-header .container {
    padding: 0 14px;
  }

  .single-post {
    padding: 20px 14px 48px;
    max-width: 100%;
  }

  .post-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
  }

  .post-title {
    font-size: 1.5rem;
    line-height: 1.35;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .post-author-bar {
    font-size: 0.78rem;
    gap: 0;
    margin-top: 12px;
    row-gap: 5px;
  }

  /* 移动端：每行独占一行，防止横向溢出 */
  .meta-row {
    display: flex; /* 改为 flex 才能用 width:100% */
    width: 100%;
    flex-wrap: nowrap;
    flex-shrink: 1;
  }

  /* 移动端隐藏桌面分隔点 */
  .meta-row-1::after {
    display: none;
  }

  .meta-icon {
    margin-right: 2px;
  }

  .meta-icon svg {
    width: 12px;
    height: 12px;
  }

  .meta-dot {
    margin: 0 4px;
  }

  .post-category-tag a {
    font-size: 0.68rem;
    padding: 2px 8px;
  }

  /* 目录 */
  .toc-container {
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
  }

  /* 正文内容 */
  .post-content {
    font-size: 0.92rem;
    line-height: 1.8;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .post-content p {
    margin: 0.9em 0;
  }

  .post-content h2 {
    font-size: 1.15rem;
    margin: 1.8em 0 0.7em;
  }

  .post-content h3 {
    font-size: 1.05rem;
    margin: 1.5em 0 0.6em;
  }

  .post-content img {
    margin: 1.2em auto;
    border-radius: 6px;
  }

  .post-content blockquote {
    padding: 12px 14px;
    margin: 1.5em 0;
    border-radius: 0 4px 4px 0;
  }

  .post-content pre {
    width: 100%;
    max-width: 100%;
    margin: 1.5em 0;
    border-radius: var(--radius-sm);
    padding-top: 40px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    box-sizing: border-box;
  }

  .post-content pre code {
    font-size: 0.82em;
    padding: 0 16px 14px;
    margin-left: 16px;
    white-space: pre;
    overflow-x: auto;
  }

  .post-content table {
    width: 100%;
    max-width: 100%;
    font-size: 0.82rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    box-sizing: border-box;
  }

  .post-content ul,
  .post-content ol {
    padding-left: 1.3em;
  }

  /* 标签 */
  .post-tags {
    margin: 24px 0 20px;
    padding-top: 16px;
    gap: 8px;
  }

  .post-tags a {
    font-size: 0.78rem;
    padding: 4px 12px;
  }

  /* 版权 */
  .post-copyright {
    margin: 20px 0;
    padding: 14px 16px;
    font-size: 0.78rem;
    border-radius: 6px;
  }

  /* 上下篇导航 */
  .post-navigation {
    margin: 24px 0;
    padding: 16px 0;
    gap: 12px;
  }

  .post-nav-item {
    padding: 12px 14px;
    border-radius: 6px;
  }

  .post-nav-label {
    font-size: 0.75rem;
    margin-bottom: 4px;
  }

  .post-nav-title {
    font-size: 0.88rem;
  }

  /* 评论 */
  .comment-respond {
    padding: 20px 16px;
    border-radius: 8px;
  }

  /* 返回顶部 */
  .back-to-top {
    right: 16px;
    bottom: 80px;
    width: 40px;
    height: 40px;
  }
}

/* 小屏手机适配 (< 375px) */
@media (max-width: 375px) {
  .post-title {
    font-size: 1.35rem;
  }

  .post-author-bar {
    font-size: 0.72rem;
  }

  .post-content {
    font-size: 0.9rem;
  }

  .post-content pre code {
    font-size: 0.78em;
  }
}

/* iPad 横屏 (1024px - 1200px) */
@media (min-width: 1024px) and (max-width: 1200px) {
  .container {
    max-width: 95%;
    padding: 0 24px;
  }

  .layout {
    gap: 32px;
    padding: 32px 0;
  }
}

/* iPad Pro 横屏 (> 1200px) */
@media (min-width: 1200px) {
  .container {
    max-width: 1100px;
    padding: 0 24px;
  }
}

/* 目录 */
.toc-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 32px;
  overflow: hidden;
  /* 与正文宽度保持一致 */
  max-width: 724px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
  box-shadow: var(--shadow);
}
.toc-container:empty,
.toc-container.toc-empty { display: none; }

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  user-select: none;
}
.toc-arrow {
  transition: transform .2s;
}
.toc-header.collapsed .toc-arrow {
  transform: rotate(-90deg);
}
.toc-nav {
  padding: 0 16px 14px;
}
.toc-nav.hidden { display: none; }

.toc-nav a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: all var(--transition);
}
.toc-nav a:hover, .toc-nav a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}
.toc-nav .toc-h3 { padding-left: 24px; font-size: 0.8rem; }
.toc-nav .toc-h4 { padding-left: 38px; font-size: 0.78rem; }

/* 正文 */
.post-content {
  font-size: var(--font-size-post);
  line-height: 1.9;
  color: var(--text);
  word-break: break-word;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* 阅读宽度固定适配 */
  max-width: 724px;
  margin-left: auto;
  margin-right: auto;
}

/* 文章区域固定宽度（桌面端） */
.single-post {
  width: 724px;
  max-width: 100%;
}

/* ── 文章卡片容器（质感阅读区） ─────────────────────── */
.article-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  box-shadow:
    0 1px 3px rgba(0,0,0,0.04),
    0 4px 16px rgba(0,0,0,0.06),
    0 0 0 1px var(--border);
  padding: 48px 52px;
  position: relative;
  overflow: hidden;
}
/* 卡片顶部装饰线 */
.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #36d68a, var(--accent));
  background-size: 200% 100%;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ── 渐变分隔线（替代普通横线） ─────────────────────── */
.post-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: none;
  position: relative;
}
.post-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  border-radius: 2px;
}

/* ── 引用块（微信风格左边框） ───────────────────────── */
.post-content blockquote {
  position: relative;
  margin: 1.8em 0;
  padding: 14px 20px 14px 22px;
  background: rgba(7, 193, 96, 0.05);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: normal;
}
[data-theme=dark] .post-content blockquote {
  background: rgba(7, 193, 96, 0.08);
}
.post-content blockquote p { margin: 0; }

/* ── 标签区精致分隔线 ───────────────────────────────── */
.post-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 40px 0 0;
  padding-top: 28px;
  border-top: none;
  position: relative;
}
.post-tags::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border) 30%, var(--border) 70%, transparent 95%);
}
.post-tags a {
  font-size: 0.82rem;
  color: var(--accent);
  background: rgba(7, 193, 96, 0.08);
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(7, 193, 96, 0.2);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  letter-spacing: 0.2px;
}
.post-tags a:hover {
  background: var(--accent);
  color: #fff !important;
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(7, 193, 96, 0.3);
}

/* ── 版权声明微调 ───────────────────────────────────── */
.post-copyright {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 32px 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.8;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
}
.post-copyright p { margin: 0.3em 0; }
.post-copyright strong { color: var(--text); }
.post-copyright a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.post-copyright a:hover { border-bottom-color: var(--accent); }

/* ── 上下篇导航卡片 ──────────────────────────────────── */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  border: none;
}
.post-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--text);
  text-decoration: none;
  min-height: 72px;
}
.post-nav-item:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(7, 193, 96, 0.15);
  transform: translateY(-2px);
}
.post-nav-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(7, 193, 96, 0.1);
  border-radius: 50%;
  color: var(--accent);
  transition: background 0.25s;
}
.post-nav-item:hover .post-nav-icon {
  background: var(--accent);
  color: #fff;
}

/* 平板适配 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
  .post-content,
  .toc-container {
    max-width: 90%;
  }
}

/* 大屏幕适配 (1024px - 1200px) */
@media (min-width: 1024px) and (max-width: 1200px) {
  .post-content,
  .toc-container {
    max-width: 684px;
  }
}

/* 超大屏幕 (> 1200px) */
@media (min-width: 1200px) {
  .post-content,
  .toc-container {
    max-width: 724px;
  }
}

/* 手机适配 (< 768px) */
@media (max-width: 768px) {
  .single-post {
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
    overflow-x: hidden;
  }
  .article-card {
    padding: 28px 20px 32px;
    border-radius: 12px;
    margin: 0 12px;
  }
  .article-card::before {
    border-radius: 12px 12px 0 0;
  }

  .post-content,
  .toc-container {
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
  }

  .post-content {
    padding-left: 0;
    padding-right: 0;
    font-size: 0.92rem;
    overflow-x: hidden;
  }

  .post-header {
    width: 100%;
    padding-left: 0;
    padding-right: 0;
    overflow-x: hidden;
  }

  .toc-container {
    margin-left: 0;
    margin-right: 0;
    max-width: 100%;
    overflow-x: hidden;
  }

  .post-tags {
    padding-left: 0;
    padding-right: 0;
  }

  .post-copyright {
    margin-left: 0;
    margin-right: 0;
  }

  .post-navigation {
    margin-left: 0;
    margin-right: 0;
  }
}

/* 小屏手机 (< 375px) */
@media (max-width: 375px) {
  .post-content {
    font-size: 0.95rem;
  }
}

/* 标题 */
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  margin: 2em 0 .8em;
  letter-spacing: -0.3px;
}
.post-content h1 { font-size: clamp(1.3rem, 4vw, 1.6rem); }
.post-content h2 {
  font-size: clamp(1.15rem, 3vw, 1.35rem);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 8px;
}
.post-content h3 { font-size: clamp(1.05rem, 2.5vw, 1.15rem); }
.post-content h4 { font-size: clamp(1rem, 2vw, 1.05rem); }

/* 段落 */
.post-content p { margin: 1em 0; }

/* 链接 */
.post-content a {
  color: var(--link);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.post-content a:hover { border-bottom-color: var(--link-hover); }

/* 图片 */
.post-content img {
  border-radius: var(--radius);
  margin: 1.5em auto;
  box-shadow: var(--shadow-sm);
}

/* 引用块 */
.post-content blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  padding: 14px 20px;
  margin: 1.8em 0;
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
  font-style: normal;
  line-height: 1.8;
}
.post-content blockquote p { margin: 0; }

/* 代码块（mdnice 深色风格 + 三个圆点） */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: #f6f8fa;
  color: #24292e;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid #e1e4e8;
}

[data-theme="dark"] .post-content code {
  background: #282c34;
  color: #abb2bf;
  border-color: #3e4451;
}

.post-content pre {
  width: 100%;
  max-width: 100%;
  background: #282c34;
  border-radius: 10px;
  overflow-x: auto;
  margin: 1.8em 0;
  position: relative;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  padding-top: 44px;
}

/* 三个圆点（用伪元素绝对定位） */
.post-content pre::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 16px;
  width: 10px;
  height: 10px;
  background: #ff5f56;
  border-radius: 50%;
}
.post-content pre::after {
  content: '';
  position: absolute;
  top: 12px;
  left: 34px;
  width: 10px;
  height: 10px;
  background: #ffbd2e;
  border-radius: 50%;
  box-shadow: 18px 0 0 #27c93f;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0 20px 18px;
  color: #abb2bf;
  font-size: clamp(0.8rem, 1.5vw, 0.88rem);
  line-height: 1.7;
  display: block;
  margin-left: 20px;
  margin-bottom: 20px;
}

/* highlight.js 样式适配 */
.post-content pre .hljs {
  background: transparent;
  padding: 0;
}

/* 代码复制按钮 */
.copy-code-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 4px 10px;
  font-size: .75rem;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all .2s;
  z-index: 10;
}
.copy-code-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.copy-code-btn.copied {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.copy-code-btn svg {
  width: 14px;
  height: 14px;
}

/* 表格（清晰边框风格） */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9em;
  overflow-x: auto;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
}
.post-content th, .post-content td {
  border: 1px solid #e0e0e0;
  padding: 10px 14px;
  text-align: left;
}
.post-content th {
  background: #f5f5f5;
  font-weight: 600;
  color: #333;
}
.post-content td {
  color: #555;
}
.post-content tr:nth-child(even) td {
  background: #fafafa;
}

[data-theme="dark"] .post-content table {
  border-color: #3e4451;
}
[data-theme="dark"] .post-content th, 
[data-theme="dark"] .post-content td {
  border-color: #3e4451;
}
[data-theme="dark"] .post-content th {
  background: #2d333b;
  color: #e6e6e6;
}
[data-theme="dark"] .post-content td {
  color: #adbac7;
}
[data-theme="dark"] .post-content tr:nth-child(even) td {
  background: #262b33;
}

/* 列表 */
.post-content ul, .post-content ol {
  padding-left: 1.5em;
  margin: 1em 0;
}
.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }
.post-content li { margin: .4em 0; }

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



@media (max-width: 640px) {
  .post-navigation { grid-template-columns: 1fr; }
}

.post-nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  text-decoration: none;
  min-height: 80px;
}

.post-nav-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.post-nav-prev {
  flex-direction: row;
}

.post-nav-next {
  flex-direction: row-reverse;
  text-align: right;
}

/* 箭头图标 */
.post-nav-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 50%;
  transition: all var(--transition);
}

.post-nav-item:hover .post-nav-icon {
  background: var(--accent);
}

.post-nav-icon svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
  transition: color var(--transition);
}

.post-nav-item:hover .post-nav-icon svg {
  color: #fff;
}

/* 内容区域 */
.post-nav-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.post-nav-next .post-nav-content {
  align-items: flex-end;
  text-align: right;
}

/* 标签 */
.post-nav-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 4px;
}

.post-nav-label svg {
  width: 12px;
  height: 12px;
}

/* 文章标题 */
.post-nav-title {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}

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

/* 移动端适配 */
@media (max-width: 640px) {
  .post-nav-item {
    padding: 14px 16px;
    min-height: 70px;
  }
  
  .post-nav-icon {
    width: 32px;
    height: 32px;
  }
  
  .post-nav-icon svg {
    width: 16px;
    height: 16px;
  }
  
  .post-nav-title {
    font-size: 0.88rem;
  }
}

/* ================================================
   8. 侧边栏
   ================================================ */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 80px;
}

.widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}
.widget:hover {
  box-shadow: var(--shadow-lg);
}

.widget-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 个人资料卡 - 微信风格 */
.widget-profile {
  text-align: center;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 28px 20px 20px;
  border: 1px solid var(--border);
}
.profile-header {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}
.profile-avatar-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  padding: 2px;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.profile-avatar-img {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--bg-secondary);
}
.profile-avatar-default {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
}
.profile-avatar-default svg {
  width: 100%;
  height: 100%;
}
.profile-name-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-bottom: 10px;
}
.profile-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}
.profile-bio {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
  padding: 0 4px;
}
.profile-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 0 24px;
}
.stat-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}
.stat-num {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.profile-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}
.profile-link {
  color: var(--text-muted);
  transition: color 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
}
.profile-link:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* Logo 图片 */
.header-logo-img {
  height: 36px;
  width: auto;
  object-fit: contain;
  display: block;
  flex-shrink: 0; /* 图片不压缩 */
}

/* 站点名称：移动端超长时截断 */
.header-site-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  line-height: 1.2;
}

/* 搜索框 */
.search-form .search-input-wrap {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.search-form .search-input-wrap:focus-within {
  border-color: var(--accent);
}
.search-form input {
  flex: 1;
  padding: 9px 12px;
  border: none;
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
}
.search-form button {
  padding: 0 14px;
  background: var(--accent);
  color: #fff;
  transition: background var(--transition);
}
.search-form button:hover { background: var(--accent-hover); }

/* 最新文章 */
.recent-posts li {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.recent-posts li:last-child { border-bottom: none; }
.recent-posts a {
  font-size: 0.88rem;
  color: var(--text);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}
.recent-posts a:hover { color: var(--accent); }
.recent-posts .post-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* 分类列表 */
.category-list li {
  border-bottom: 1px solid var(--border);
}
.category-list li:last-child { border-bottom: none; }
.category-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-size: 0.88rem;
  color: var(--text);
  transition: color var(--transition);
}
.category-list a:hover { color: var(--accent); }
.cat-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 1px 8px;
  border-radius: 20px;
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-item {
  font-size: var(--tag-size, 0.8rem);
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 20px;
  transition: all var(--transition);
}
.tag-item:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ================================================
   9. 评论区
   ================================================ */
.comments-section {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 2px solid var(--border);
}

.comments-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.comment-list {
  margin-bottom: 40px;
}

.comment-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.comment-item:last-child {
  border-bottom: none;
}

/* 微信公众号风格：回复层级 */
.comment-item.comment-reply {
  margin-left: 50px;
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 8px 8px 0;
  margin-top: 8px;
}

.comment-children {
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 2px solid var(--border);
}

.comment-level-even {
  border-left-color: var(--accent);
}

.comment-children .comment-item {
  margin: 16px 0;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: 8px;
}

.comment-children .comment-avatar img {
  width: 36px;
  height: 36px;
}

.comment-avatar img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  flex-shrink: 0;
  float: left;
  margin-right: 12px;
}

.comment-body {
  overflow: hidden;
}

.comment-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.comment-author {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.comment-reply-to {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.comment-reply-to svg {
  flex-shrink: 0;
}

.comment-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.comment-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
}

.reply-btn {
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.reply-btn:hover {
  color: var(--accent);
}
.reply-btn::before {
  content: '';
  width: 1px;
  height: 12px;
  background: var(--border);
  margin-right: 4px;
}

.comment-text {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.75;
  word-break: break-word;
}
.comment-item.comment-reply .comment-text {
  font-size: 0.88rem;
}
.comment-text a { color: var(--link); }
.comment-text code {
  font-size: 0.85em;
  background: var(--bg-code);
  padding: 1px 5px;
  border-radius: 3px;
}

/* 评论表单 */
.comment-respond {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
}

.comment-reply-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.comment-reply-title small a {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
}

.form-row-inline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 640px) {
  .form-row-inline { grid-template-columns: 1fr; }
}

.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-group label .required { color: var(--danger); margin-left: 2px; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-submit {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-submit {
  padding: 10px 28px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition);
}
.btn-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}
.btn-submit:active { transform: translateY(0); }

.comment-note {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ================================================
   10. 页面标题（分类/标签/搜索）
   ================================================ */
.page-heading {
  margin-bottom: 24px;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--accent);
}
.page-heading .page-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}
.page-heading .page-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* ================================================
   11. 空状态
   ================================================ */
.no-results {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-muted);
}
.no-results-icon {
  margin: 0 auto 24px;
  opacity: .4;
}
.no-results h2 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text-secondary);
}
.no-results p {
  font-size: 0.9rem;
}
.no-results a { color: var(--accent); }

/* ================================================
   12. 页脚
   ================================================ */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.footer-logo {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  text-decoration: none;
}
.footer-logo:hover { color: var(--accent); }
.footer-logo-img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 6px;
}
.footer-slogan {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-nav-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-nav-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-nav-links a:hover { color: var(--accent); }

.footer-social-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-social-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-social-item:hover { color: var(--accent); }

.footer-qrcode {
  margin-top: 16px;
  padding: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: inline-block;
}
.qrcode-img {
  width: 100px;
  height: 100px;
  object-fit: contain;
  display: block;
  transition: transform 0.2s ease;
  cursor: zoom-in;
}
.qrcode-img.zoomed {
  transform: scale(1.8);
  cursor: zoom-out;
  position: relative;
  z-index: 100;
}

.footer-bottom {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 20px;
  line-height: 1.8;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent); }

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-col-title { font-size: 0.9rem; }
  .footer-logo { font-size: 1rem; }
  .footer-nav-links a, .footer-social-item { font-size: 0.9rem; }
  .qrcode-img { width: 90px; height: 90px; }
  .footer-qrcode { padding: 8px; }
  /* iPhone 安全间距（防止被底部横条遮挡） */
  .site-footer {
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    margin-bottom: calc(env(safe-area-inset-bottom, 0px));
  }
  .footer-bottom {
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  }
}

/* 回到顶部 */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .3s, transform .3s;
  z-index: 500;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--accent-hover); }

/* ================================================
   13. 辅助类
   ================================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ================================================
   14. 响应式微调
   ================================================ */
/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  transition: color 0.2s;
}
.menu-toggle:hover { color: var(--text); }
.menu-toggle[aria-label="打开菜单"] .icon-menu { display: block; }
.menu-toggle[aria-label="关闭菜单"] .icon-menu { display: none; }
.menu-toggle[aria-label="关闭菜单"] .icon-close { display: block; }

/* 移动端菜单面板 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
  box-shadow: -8px 0 30px rgba(0,0,0,0.15);
  z-index: 1000;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}
.mobile-menu.open {
  right: 0;
}
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.mobile-menu-overlay.open {
  opacity: 1;
  visibility: visible;
}
.mobile-menu-inner {
  padding: 0;
  height: 100%;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}
.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  min-height: 60px;
}
.mobile-menu-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.mobile-menu-title::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--accent);
  border-radius: 2px;
}
.mobile-menu-close {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.mobile-menu-close:hover {
  color: var(--text);
  background: var(--border);
}
.mobile-menu-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.mobile-menu-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  color: var(--text);
  font-size: 0.95rem;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}
.mobile-menu-link:hover {
  background: var(--bg-secondary);
  color: var(--accent);
  border-left-color: var(--accent);
}
.mobile-menu-link svg { color: var(--text-muted); flex-shrink: 0; }
.mobile-menu-link:hover svg { color: var(--accent); }

/* 移动端主题切换按钮（在导航栏上） */
.mobile-theme-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}
.mobile-theme-toggle-btn:hover {
  color: var(--text);
  background: var(--bg-secondary);
}
.mobile-theme-toggle-btn .icon-moon { display: none; }
[data-theme="dark"] .mobile-theme-toggle-btn .icon-sun { display: none; }
[data-theme="dark"] .mobile-theme-toggle-btn .icon-moon { display: block; }

@media (max-width: 640px) {
  .container { padding: 0 14px; }
  .post-card-body { padding: 16px; }
  .comment-respond { padding: 20px 16px; }
  /* 回到顶部按钮位置优化 iPhone 安全区 */
  .back-to-top { bottom: calc(20px + env(safe-area-inset-bottom, 0px)); right: 16px; }
  /* 导航栏防溢出 */
  .site-header .container { overflow: hidden; }
  .site-nav { gap: 6px; flex-shrink: 0; }
  .site-nav a { display: none; }
  .menu-toggle { display: flex; }
  .mobile-theme-toggle-btn { display: flex; }
  .theme-toggle, .search-toggle { display: none; }
  /* 移动端底部安全间距 */
  .site-footer {
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    margin-bottom: calc(env(safe-area-inset-bottom, 0px));
  }
  .footer-bottom {
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  }
  /* 移动端二维码居中 */
  .footer-social-col { text-align: center; }
  .footer-social-links { align-items: center; }
  .footer-qrcode {
    padding: 8px;
    margin-top: 12px;
    margin-left: auto;
    margin-right: auto;
  }
  .qrcode-img { width: 80px; height: 80px; }
  /* 文章页面底部移动端适配 */
  .post-tags {
    margin: 24px 0 20px;
    padding-top: 20px;
    gap: 8px;
  }
  .post-tags a {
    font-size: 0.8rem;
    padding: 4px 10px;
  }
  .post-copyright {
    margin: 20px 0;
    padding: 14px 16px;
    font-size: 0.8rem;
  }
  .post-navigation {
    margin: 24px 0;
    padding: 20px 0;
    gap: 16px;
  }
}

/* ================================================
   15. 打印样式
   ================================================ */
@media print {
  .site-header, .sidebar, .site-footer,
  .back-to-top, .post-navigation,
  .comment-respond, .theme-toggle, .search-toggle { display: none !important; }
  .layout { display: block; }
  body { font-size: 12pt; color: #000; background: #fff; }
  a { color: #000; }
  .post-content a::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #666; }
}

/* ================================================
   16. 留言板页面
   ================================================ */
.guestbook-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

/* 页面标题 */
.page-header {
  text-align: center;
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.page-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}
.page-title svg {
  color: var(--accent);
  flex-shrink: 0;
}
.page-description {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* 留言计数 */
.guestbook-count {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  padding-left: 8px;
  border-left: 3px solid var(--accent);
}

/* 留言列表 */
.guestbook-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 48px;
}

/* 单条留言 */
.guestbook-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition);
}
.guestbook-item:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.guestbook-avatar {
  flex-shrink: 0;
}
.guestbook-avatar img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

.guestbook-content {
  flex: 1;
  min-width: 0;
}

.guestbook-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}
.guestbook-author {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text);
}
.guestbook-author a {
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition);
}
.guestbook-author a:hover {
  color: var(--accent);
}
.guestbook-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.guestbook-text {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.75;
  word-break: break-word;
}
.guestbook-text a {
  color: var(--link);
  word-break: break-all;
}
.guestbook-text p {
  margin: 0;
}
.guestbook-text p + p {
  margin-top: 8px;
}

/* 空状态 */
.guestbook-empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}
.guestbook-empty svg {
  opacity: 0.3;
  margin-bottom: 16px;
}
.guestbook-empty p {
  font-size: 0.95rem;
}

/* 留言表单 */
.guestbook-form-wrap {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
}

.guestbook-form-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.guestbook-form-title small a {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
}

.guestbook-form .form-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.guestbook-form .form-group {
  margin-bottom: 16px;
}
.guestbook-form .form-group:last-of-type {
  margin-bottom: 0;
}

.guestbook-form .form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.guestbook-form .form-group label .required {
  color: var(--danger);
  margin-left: 2px;
}

.guestbook-form .form-group input,
.guestbook-form .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.guestbook-form .form-group input:focus,
.guestbook-form .form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.guestbook-form .form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

/* 提交按钮 */
.guestbook-form .form-submit {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
}

.guestbook-form .btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 28px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition);
}
.guestbook-form .btn-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}
.guestbook-form .btn-submit:active {
  transform: translateY(0);
}

/* 评论关闭提示 */
.comment-closed {
  text-align: center;
  padding: 32px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 640px) {
  .guestbook-page {
    padding: 24px 16px 48px;
  }
  .page-title {
    font-size: 1.4rem;
  }
  .guestbook-item {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
  }
  .guestbook-avatar img {
    width: 40px;
    height: 40px;
  }
  .guestbook-form .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .guestbook-form-wrap {
    padding: 20px 16px;
  }
}

/* ================================================
   微信公众号风格评论样式
   ================================================ */
.comments-wrap {
  margin-top: 40px;
}

.comments-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.comments-title::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--accent);
  border-radius: 2px;
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 顶级评论 */
.wechat-comment {
  display: flex;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--border);
}

.wechat-comment:last-child {
  border-bottom: none;
}

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

.wechat-content {
  flex: 1;
  min-width: 0;
}

.wechat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.wechat-author {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.wechat-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.wechat-text {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 8px;
  word-break: break-word;
}

.wechat-actions {
  display: flex;
  gap: 12px;
}

.wechat-reply-btn {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.wechat-reply-btn:hover {
  color: var(--accent);
}

/* 回复列表 */
.wechat-replies {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.wechat-reply-item {
  display: flex;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.wechat-reply-item .wechat-avatar {
  width: 32px;
  height: 32px;
  border: none;
}

.wechat-reply-content {
  flex: 1;
  min-width: 0;
}

.wechat-reply-header {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 4px;
  font-size: 0.78rem;
}

.wechat-reply-header .wechat-author {
  font-size: 0.78rem;
}

.wechat-reply-arrow {
  color: var(--text-muted);
}

.wechat-reply-to {
  color: var(--accent);
  font-weight: 500;
}

.wechat-reply-header .wechat-time {
  font-size: 0.72rem;
}

.wechat-reply-text {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.6;
  word-break: break-word;
}

.wechat-reply-actions {
  margin-top: 4px;
}

/* 响应式 */
@media (max-width: 640px) {
  .wechat-comment {
    gap: 10px;
  }

  .wechat-avatar {
    width: 36px;
    height: 36px;
  }

  .wechat-reply-item {
    padding: 8px 10px;
  }

  .wechat-reply-item .wechat-avatar {
    width: 28px;
    height: 28px;
  }
}

/* ================================================
   首页文章卡片 - 微信公众号风格
   ================================================ */

.post-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

.post-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.post-card-inner {
  display: flex;
  gap: 16px;
  padding: 20px;
}

/* 左侧封面图 */
.post-card-image {
  width: 140px;
  height: 105px;
  flex-shrink: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-secondary);
}

.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

/* 无图片时的渐变占位图 */
.post-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.post-thumb-placeholder .placeholder-text {
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.4;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.15);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  padding: 8px;
}

.post-thumb-placeholder::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

/* 右侧内容 */
.post-card-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 分类标签 */
.post-card-category {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
}

.post-card-category .icon {
  width: 12px;
  height: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.post-card-category a,
.post-card-category span {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--tag-bg);
  padding: 2px 10px;
  border-radius: 999px;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
}

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

/* 标题 */
.post-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0;
}

.post-card-title a {
  color: var(--text);
  transition: color 0.2s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

/* 摘要 */
.post-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 元信息 */
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
}

.post-card-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.post-card-meta svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* 响应式 - 微信公众号风格 */
@media (max-width: 640px) {
  .post-list {
    gap: 20px;
    padding: 0 16px;
  }

  .post-card {
    margin-bottom: 0;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    border: none;
    overflow: hidden;
  }

  .post-card-inner {
    flex-direction: column;
    padding: 0;
    gap: 0;
  }

  /* 移动端显示封面图或颜色占位 */
  .post-card-image {
    display: block;
    width: 100%;
    height: 180px;
    border-radius: 12px 12px 0 0;
  }

  .post-card-image img {
    border-radius: 12px 12px 0 0;
  }

  /* 无图片时的纯色占位 - iOS Safari 兼容 */
  .post-thumb-placeholder {
    width: 100%;
    height: 180px;
    min-height: 180px;
    border-radius: 12px 12px 0 0;
  }

  .post-thumb-placeholder .placeholder-text {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    padding: 12px 16px;
    word-break: break-word;
    line-height: 1.4;
  }

  /* 桌面端占位块保持原有样式 */
  .post-card-image .post-thumb-placeholder {
    height: 100% !important;
    min-height: 100% !important;
    max-height: none;
    border-radius: var(--radius);
  }

  .post-card-image .post-thumb-placeholder .placeholder-text {
    font-size: 0.9rem;
  }

  .post-card-content {
    padding: 14px 16px;
    gap: 10px;
  }

  .post-card-title {
    font-size: 1.05rem;
    line-height: 1.5;
    font-weight: 600;
  }

  .post-card-title a {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .post-card-category {
    margin-bottom: 0;
    order: -1;
  }

  .post-card-category a,
  .post-card-category span {
    padding: 2px 8px;
    font-size: 0.7rem;
  }

  .post-card-meta {
    margin-top: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
  }

  .post-card-excerpt {
    display: block;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-top: 4px;
  }

  .post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  }
}