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pre code.hljs {
  display: block;
  overflow-x: auto;
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}
code.hljs {
  padding: 3px 5px
}
/*!
  Theme: GitHub Dark
  Description: Dark theme as seen on github.com
  Author: github.com
  Maintainer: @Hirse
  Updated: 2021-05-15

  Outdated base version: https://github.com/primer/github-syntax-dark
  Current colors taken from GitHub's CSS
*/
.hljs {
  color: #c9d1d9;
  background: #0d1117
}
.hljs-doctag,
.hljs-keyword,
.hljs-meta .hljs-keyword,
.hljs-template-tag,
.hljs-template-variable,
.hljs-type,
.hljs-variable.language_ {
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  color: #ff7b72
}
.hljs-title,
.hljs-title.class_,
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.hljs-title.function_ {
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  color: #d2a8ff
}
.hljs-attr,
.hljs-attribute,
.hljs-literal,
.hljs-meta,
.hljs-number,
.hljs-operator,
.hljs-variable,
.hljs-selector-attr,
.hljs-selector-class,
.hljs-selector-id {
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  color: #79c0ff
}
.hljs-regexp,
.hljs-string,
.hljs-meta .hljs-string {
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}
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@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;500;600;700&display=swap');

:root,
[data-theme="light"] {
  --color-bg: #fafafa;
  --color-bg-secondary: #ffffff;
  --color-bg-elevated: #ffffff;
  --color-text: #18181b;
  --color-text-secondary: #71717a;
  --color-text-muted: #a1a1aa;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e4e4e7;
  --color-border-light: #f4f4f5;
  --color-code-bg: #1e1e1e;
  --color-code-header: #2d2d2d;
  --color-card-shadow: rgba(0, 0, 0, 0.04);
  --color-overlay: rgba(0, 0, 0, 0.5);
  --color-search-bg: rgba(255, 255, 255, 0.98);
  --color-tag-bg: #f4f4f5;
  --color-tag-text: #52525b;
  --color-progress: #2563eb;
  --color-toc-active: #2563eb;
  --color-hero-gradient: linear-gradient(135deg, #fafafa 0%, #f0f0f0 100%);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif SC', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px var(--color-card-shadow);
  --shadow-md: 0 4px 12px var(--color-card-shadow);
  --shadow-lg: 0 8px 24px var(--color-card-shadow);
  --max-width: 880px;
  --content-width: 880px; /* 这个和max-witdth需要同时增加相同的值 */
  --post-max-width: 1240px;
  --nav-height: 64px;
  --transition: 200ms ease;
}

[data-theme="dark"] {
  --color-bg: #09090b;
  --color-bg-secondary: #18181b;
  --color-bg-elevated: #27272a;
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-border: #27272a;
  --color-border-light: #1f1f23;
  --color-code-bg: #1e1e1e;
  --color-code-header: #2d2d2d;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.7);
  --color-search-bg: rgba(24, 24, 27, 0.98);
  --color-tag-bg: #27272a;
  --color-tag-text: #a1a1aa;
  --color-progress: #3b82f6;
  --color-toc-active: #3b82f6;
  --color-hero-gradient: linear-gradient(135deg, #09090b 0%, #18181b 100%);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
}
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
ul, ol { list-style: none; }

.site-main {
  min-height: calc(100vh - var(--nav-height));
  padding-top: var(--nav-height);
}
.page-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 100;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  box-shadow: var(--shadow-sm);
  background: var(--color-bg-secondary);
}
.nav-container {
  /* max-width: var(--max-width); */
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--color-accent); }
.nav-links {
  display: flex;
  gap: 0.25rem;
}
.nav-link {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-text);
  background: var(--color-border-light);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
}
.nav-btn:hover {
  color: var(--color-text);
  background: var(--color-border-light);
}
.hamburger { display: none; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding: 2.5rem 0;
  margin-top: 4rem;
}
.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}
.footer-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}
.social-link:hover {
  color: var(--color-accent);
  background: var(--color-border-light);
  transform: translateY(-2px);
}
.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}
.footer-icp {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.footer-icp a { color: var(--color-text-muted); }
.footer-icp a:hover { color: var(--color-text-secondary); }

/* WeChat Modal */
.wechat-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.wechat-modal.active { display: flex; }
.wechat-modal-content {
  background: var(--color-bg-elevated);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.wechat-modal-content img {
  max-width: 200px;
  margin: 1rem auto;
  border-radius: var(--radius-sm);
}
.wechat-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.post-detail {
  max-width: var(--max-width);
  max-width: var(--post-max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 220px 1fr 220px;
  gap: 0 2rem;
}
.post-header {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}
.post-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}
.post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
}
.meta-sep {
  color: var(--color-text-muted);
}
.post-tags {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.tag-badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 999px;
  font-size: 0.8rem;
  transition: background var(--transition), color var(--transition);
}
.tag-badge:hover {
  background: var(--color-accent);
  color: #fff;
}
.post-layout {
  grid-column: 1 / span 3;
  display: flex;
  gap: 2rem;
  position: relative;
  justify-content: center;
}
.post-content {
  flex: 1;
  min-width: 0;
  max-width: var(--content-width);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  background-color: var(--color-bg-secondary);
}
.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 2em 0 0.75em;
  line-height: 1.35;
}
.post-content h1 {
  font-size: 1.75rem;
}
.post-content h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: 0.3em;
}
.post-content h3 {
  font-size: 1.25rem;
}
.post-content p {
  margin-bottom: 1.25em;
}
.post-content a {
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
}
.post-content a:hover {
  border-bottom-color: var(--color-accent);
}
.post-content strong {
  font-weight: 600;
}
.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.5em 1em;
  margin: 1.5em 0;
  color: var(--color-text-secondary);
  background: var(--color-border-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.post-content ul, .post-content ol {
  margin: 1em 0;
  padding-left: 1.5em;
}
.post-content li {
  margin-bottom: 0.4em;
}
.post-content ul {
  list-style: disc;
}
.post-content ol {
  list-style: decimal;
}
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}
.post-content th, .post-content td {
  border: 1px solid var(--color-border);
  padding: 0.6em 0.8em;
  text-align: left;
}
.post-content th {
  background: var(--color-border-light);
  font-weight: 600;
}
.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}
.post-content img {
  border-radius: var(--radius-md);
  margin: 1.5em auto;
  box-shadow: var(--shadow-sm);
}
.post-sidebar-left {
  width: 220px;
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  max-height: calc(100vh - var(--nav-height) - 4rem);
  overflow-y: auto;
  align-self: flex-start;
  order: -1;
}
.sidebar-section {
  margin-bottom: 2rem;
}
.sidebar-heading {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.sidebar-related {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.sidebar-related-card {
  display: block;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.sidebar-related-card:hover {
  border-color: var(--color-accent);
}
.sidebar-related-card h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text);
  line-height: 1.4;
}
.sidebar-related-card time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.sidebar-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.sidebar-nav-link {
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.sidebar-nav-link:hover {
  border-color: var(--color-accent);
}
.sidebar-nav-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0.2rem;
}
.sidebar-nav-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}
@media (max-width: 1024px) {
  .post-detail {
    display: block;
  }
  .post-header {
    margin-bottom: 1.5rem;
  }
}
.sort-toggle {
  display: flex;
  gap: 0.25rem;
  background: var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 0.2rem;
}
.sort-btn {
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: background var(--transition), color var(--transition);
}
.sort-btn.active {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}
.post-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
.post-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.post-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.post-card-link {
  display: block;
  padding: 1.5rem;
  color: inherit;
}
.post-card-link:hover { color: inherit; }
.post-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  color: var(--color-text);
}
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}
.post-card-reading { color: var(--color-text-muted); }
.post-card-summary {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}
.post-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.empty-state {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  text-align: center;
  color: var(--color-text-muted);
}

.code-block {
  margin: 1.5em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-code-bg);
}
.code-block pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  background: transparent;
}
.code-block pre code {
  font-family: var(--font-mono);
  background: transparent;
}
/* KaTeX */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5em 0;
  text-align: center;
}
.katex-display > .katex {
  white-space: normal;
}

.toc-sidebar {
  width: 220px;
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  max-height: calc(100vh - var(--nav-height) - 4rem);
  overflow-y: auto;
  align-self: flex-start;
  order: 1;

  border-radius: var(--radius-md);      
  padding: 1.5rem 1rem;            
  background-color: var(--color-bg-secondary); /* 纯白背景色 */

}

.toc-header {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.toc-nav a {
  display: block;
  padding: 0.3rem 0;
  padding-left: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-left: 2px solid var(--color-border-light);
  line-height: 1.4;
  transition: color var(--transition), border-color var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toc-nav a:hover {
  color: var(--color-text);
}
.toc-nav a.active {
  color: var(--color-toc-active);
  border-left-color: var(--color-toc-active);
}
.toc-nav a[data-level="3"] { padding-left: 1.5rem; font-size: 0.75rem; }

.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 150;
}
.search-modal.active { display: block; }
.search-modal-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
}
.search-modal-body {
  position: relative;
  max-width: 600px;
  margin: 10vh auto 0;
  background: var(--color-search-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}
.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border-light);
}
.search-input-wrap svg { flex-shrink: 0; color: var(--color-text-muted); }
.search-input {
  flex: 1;
  border: none;
  background: none;
  font-size: 1rem;
  color: var(--color-text);
  outline: none;
  font-family: var(--font-sans);
}
.search-input::placeholder { color: var(--color-text-muted); }
.search-esc {
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  background: var(--color-border-light);
  border: 1px solid var(--color-border);
}
.search-results {
  max-height: 60vh;
  overflow-y: auto;
  padding: 0.5rem;
}
.search-result-item {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: background var(--transition);
}
.search-result-item:hover {
  background: var(--color-border-light);
}
.search-result-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.search-result-date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.search-result-summary {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 0.2rem;
  line-height: 1.4;
}
.search-no-result {
  padding: 2rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* --- 页面基础容器 --- */
.tags-page {
  max-width: var(--max-width, 1200px); 
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* --- 外层大网格：强制三列布局 --- */
.tags-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* PC端固定均分3列 */
  gap: 1.5rem;
  margin-top: 2rem;
}

/* 响应式适配：外层卡片的列数随屏幕变小而减少 */
@media (max-width: 1024px) {
  .tags-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .tags-grid { grid-template-columns: 1fr; }
}

/* --- 卡片基础样式 --- */
.tag-card {
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
  border: 1px solid var(--color-border-light);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column; 
}

.tag-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* --- 卡片标题 --- */
.tag-heading {
  display: flex;
  align-items: center;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1.2rem;
  gap: 0.5rem;
}

.tag-icon { color: var(--color-text-muted); }
.tag-count {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  align-self: flex-start;
  margin-top: 0.1rem;
}

/* =========================================
   核心修改区：内部胶囊变成一行两列
========================================= */

/* --- 内部胶囊容器：使用 Grid 实现强制 2 列 --- */
.article-pills {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 关键：内部划分为均等的 2 列 */
  gap: 0.75rem; /* 胶囊之间的上下左右间距 */
}

/* --- 胶囊按钮：占满自己的格子 + 超出省略号 --- */
.article-pill {
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition);
  
  /* 尺寸与截断控制 */
  display: block;
  width: 100%;            /* 撑满分配给它的那一半网格空间 */
  box-sizing: border-box; 
  white-space: nowrap;    /* 强制不换行 */
  overflow: hidden;       /* 超出隐藏 */
  text-overflow: ellipsis;/* 显示省略号... */
}

/* 悬浮交互 */
.article-pill:hover {
  background-color: rgba(37, 99, 235, 0.1); 
  color: var(--color-accent);
}

/* 可选：如果你觉得手机端屏幕太小，内部还分两列会导致标题被截断得太短，可以在手机端让内部恢复一列 */
@media (max-width: 480px) {
  .article-pills {
    grid-template-columns: 1fr; /* 手机端内部变回 1 列 */
  }
}
.archive-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}
.timeline {
  position: relative;
  padding: 0 1rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
  transform: translateX(-50%);
}
.timeline-year {
  margin-bottom: 2.5rem;
}
.year-label {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}
.year-label::after {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  border-radius: 50%;
  position: absolute;
  left: 50%;
  bottom: -0.75rem;
  transform: translateX(-50%);
}
.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: calc(50% + 1.5rem);
  position: relative;
  margin-bottom: 1rem;
}
.timeline-item::after {
  content: '';
  position: absolute;
  right: calc(50% - 1px);
  top: 50%;
  width: 24px;
  height: 2px;
  background: var(--color-border);
  transform: translateY(-50%);
}
.timeline-item-right {
  justify-content: flex-start;
  padding-right: 0;
  padding-left: calc(50% + 1.5rem);
}
.timeline-item-right::after {
  right: auto;
  left: calc(50% - 1px);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}
.timeline-card {
  padding: 1rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  transition: border-color var(--transition), box-shadow var(--transition);
  max-width: 380px;
  width: 100%;
}
.timeline-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}
.timeline-card time {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}
.timeline-card a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
}
.timeline-card a:hover { color: var(--color-accent); }

/* _tools.css */

.tools-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* 工具网格布局 */
.tools-grid {
  display: grid;
  /* 自动填充列，每列最小 280px，自适应宽度 */
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

/* 工具卡片基础样式 */
.tool-card {
  display: flex;
  align-items: flex-start;
  padding: 1.5rem;
  background: var(--color-bg-secondary); /* 建议在 _variables.css 定义这个变量，或者直接用 #ffffff */
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

/* 鼠标悬浮效果：向上浮动、边框变色、加阴影 */
.tool-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

/* 图标区域 */
.tool-icon {
  margin-right: 1.2rem;
  font-size: 1.8rem;
  color: var(--color-accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 文字内容区域 */
.tool-info {
  display: flex;
  flex-direction: column;
}

.tool-info h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
}

.tool-info p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-muted); /* 对应你变量里的次要文字颜色 */
}

/* 移除原来 placeholder 的样式（如果没用了可以删掉） */
.tools-placeholder {
  display: none; 
}

/* 分类标签（可选，如果你在模板里加了的话） */
.category-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  align-self: flex-start;
  margin-bottom: 0.5rem;
}
.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 180;
  cursor: zoom-out;
  align-items: center;
  justify-content: center;
}
.lightbox-overlay.active { display: flex; }
.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  transition: transform 0.2s ease;
  cursor: grab;
}
.lightbox-overlay img.grabbing { cursor: grabbing; }

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--color-progress);
  z-index: 110;
  width: 0%;
  transition: width 0.1s linear;
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--nav-height));
  background: var(--color-hero-gradient);
}
.hero-content {
  text-align: center;
  padding: 2rem 1.5rem;
}
.hero-avatar {
  width: 380px;
  margin: 0 auto 1.5rem;

  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-avatar img {
  width: 100%;
  height: auto;
  display: block;
}
.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
}
.hero-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
}
.hero-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition);
}
.hero-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-accent);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    right: 0;
    bottom: 0;
    width: 240px;
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    padding: 1rem;
    z-index: 99;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; }
  .hero-nav {
    grid-template-columns: repeat(2, 1fr);
    max-width: 360px;
  }
  .hero-title { font-size: 1.75rem; }
  .post-grid {
    grid-template-columns: 1fr;
  }
  .post-layout {
    flex-direction: column;
  }
  .post-sidebar-left {
    position: static;
    width: 100%;
    max-height: none;
    order: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
  }
  .sidebar-section { margin-bottom: 0; }
  .toc-sidebar {
    position: static;
    width: 100%;
    max-height: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.5rem;
    order: 1;
  }
  .post-content {
    order: 0;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .timeline::before {
    left: 1rem;
  }
  .timeline-item,
  .timeline-item-right {
    justify-content: flex-start;
    padding-left: 2.5rem;
    padding-right: 0;
  }
  .timeline-item::after,
  .timeline-item-right::after {
    left: 1rem;
    right: auto;
    width: 16px;
  }
  .timeline-item::before {
    left: 1rem;
  }
  .year-label::after {
    left: 1rem;
  }
  .timeline-card {
    max-width: 100%;
  }
  .search-modal-body {
    margin: 5vh 1rem 0;
  }
}

@media (max-width: 480px) {
  .hero-nav {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }
  .hero-card {
    padding: 1rem 0.75rem;
  }
  .post-title { font-size: 1.5rem; }
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .post-sidebar-left {
    grid-template-columns: 1fr;
  }
}