/* ═══════════════════════════════════════════════════
   知识库 — Anthropic 极简美学
   字体：霞鹜文楷 + Inter
   ═══════════════════════════════════════════════════ */

/* ───── 设计令牌 ───── */
:root {
  /* 色板 — Anthropic 风格暖色调 */
  --bg:            #FAFAF7;
  --bg-card:       #FFFFFF;
  --bg-elevated:   #F5F5F0;
  --bg-hero:       #1A1A1A;
  --ink:           #1A1A1A;
  --ink-secondary: #6B6B6B;
  --ink-muted:     #9B9B9B;
  --border:        #E8E8E3;
  --border-light:  #F0F0EB;
  --accent:        #D97706;
  --accent-light:  #FEF3C7;
  --accent-hover:  #B45309;
  --radius:        12px;
  --radius-sm:     8px;
  --radius-lg:     20px;
  --shadow-sm:     0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg:     0 8px 30px rgba(0,0,0,0.08);
  --transition:    0.2s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-cn:   'LXGW WenKai Screen', 'LXGW WenKai', 'Noto Serif SC', serif;
  --font-en:   'LXGW WenKai Screen', 'LXGW WenKai', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* 间距 */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
}

/* 暗色主题 */
[data-theme="dark"] {
  --bg:            #111111;
  --bg-card:       #1A1A1A;
  --bg-elevated:   #222222;
  --ink:           #EDEDED;
  --ink-secondary: #A0A0A0;
  --ink-muted:     #666666;
  --border:        #2A2A2A;
  --border-light:  #1E1E1E;
  --accent:        #F59E0B;
  --accent-light:  #451A03;
  --accent-hover:  #FBBF24;
  --shadow-sm:     0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg:     0 8px 30px rgba(0,0,0,0.4);
}

/* ───── 全局重置 ───── */
*, *::before, *::after {
  margin: 0; padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), color var(--transition);
}

/* 等宽字体 */
code, pre {
  font-family: var(--font-mono);
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ───── 导航栏 ───── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 1.1rem;
  white-space: nowrap;
}

.logo-icon { font-size: 1.3rem; }
.logo-text { letter-spacing: -0.02em; }

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

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-secondary);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  background: none;
}

.nav-link:hover {
  color: var(--ink);
  background: var(--bg-elevated);
}

/* 下拉菜单 */
.nav-dropdown { position: relative; }

.dropdown-content {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm);
  z-index: 50;
}

.dropdown-content a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--ink-secondary);
  transition: all var(--transition);
}

.dropdown-content a:hover {
  background: var(--bg-elevated);
  color: var(--ink);
}

.nav-dropdown:hover .dropdown-content { display: block; }

/* 搜索框 */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.search-box {
  position: relative;
}

.search-box input {
  width: 220px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--ink);
  font-family: var(--font-cn);
  font-size: 0.85rem;
  outline: none;
  transition: all var(--transition);
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  width: 280px;
}

.search-box input::placeholder { color: var(--ink-muted); }

.search-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  min-width: 320px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  overflow: hidden;
}

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

.search-item {
  display: block;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition);
}

.search-item:last-child { border-bottom: none; }
.search-item:hover { background: var(--bg-elevated); }

.search-item-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.search-item-cat {
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.icon-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition);
}

.icon-btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

/* ───── Hero 区域 ───── */
.hero {
  background: var(--bg-hero);
  background-image: url('/static/images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
  padding: var(--space-4xl) 0;
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 0;
}

.hero > .container {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.7);
  max-width: 540px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-top: 2px;
}

.hero-stat-link {
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border-radius: var(--radius);
  padding: 8px 16px;
}

.hero-stat-link:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-2px);
}

.hero-stat-link:hover .hero-stat-num {
  color: #fff;
}

.hero-stat-link:hover .hero-stat-label {
  color: rgba(255,255,255,0.8);
}

/* ───── 区块标题 ───── */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-link {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
}

.section-link:hover { color: var(--accent-hover); }
.section-link::after { content: '→'; }

/* ───── 分类网格 ───── */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.category-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.category-card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.category-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-family: var(--font-cn);
}

.category-card p {
  font-size: 0.85rem;
  color: var(--ink-secondary);
}

.category-card .count {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 2px 10px;
  background: var(--bg-elevated);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-family: var(--font-en);
}

/* ───── 文章卡片 ───── */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.article-row {
  display: flex;
  align-items: center;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-card);
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  gap: var(--space-xl);
}

.article-row:hover {
  background: var(--bg-elevated);
}

.article-row-body { flex: 1; min-width: 0; }

.article-row h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  font-family: var(--font-cn);
  line-height: 1.4;
}

.article-row p {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-row-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.article-row-date {
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--ink-muted);
  white-space: nowrap;
}

.article-row-cat {
  padding: 2px 10px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

/* ───── 标签云 ───── */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  padding: 4px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--ink-secondary);
  transition: all var(--transition);
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ───── 文章页面 ───── */
.article-header {
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-2xl);
}

.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: var(--space-md);
  font-family: var(--font-cn);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm) var(--space-lg);
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.article-meta > span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.article-meta-tags {
  flex-wrap: wrap;
  white-space: normal !important;
  gap: 4px !important;
  justify-content: center;
}

/* 文章内容 */
.article-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content h1 { font-size: 1.8rem; margin: 2em 0 0.8em; }
.article-content h2 {
  font-size: 1.4rem;
  margin: 2em 0 0.8em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-light);
}
.article-content h3 { font-size: 1.15rem; margin: 1.5em 0 0.6em; }

.article-content p { margin-bottom: 1.2em; }

.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.article-content blockquote {
  margin: 1.5em 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 3px solid var(--accent);
  background: var(--bg-elevated);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-secondary);
}

.article-content ul, .article-content ol {
  margin: 1em 0;
  padding-left: 1.5em;
}

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

.article-content pre {
  margin: 1.5em 0;
  padding: var(--space-lg);
  background: var(--bg-hero);
  color: #E8E8E8;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.article-content p code,
.article-content li code {
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
}

.article-content th, .article-content td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.article-content th {
  background: var(--bg-elevated);
  font-weight: 600;
}

.article-content img {
  border-radius: var(--radius);
  margin: 1.5em 0;
  box-shadow: var(--shadow-md);
}

.article-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

/* 文章导航 */
.article-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
  padding: 0 var(--space-lg);
}

.article-nav a {
  flex: 1;
  display: block;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  max-width: 48%;
}

.article-nav a:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.article-nav-label {
  font-size: 0.75rem;
  color: var(--ink-muted);
  margin-bottom: 4px;
}

.article-nav-title {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ───── 搜索结果页 ───── */
.search-page {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

.search-page h1 {
  font-size: 1.5rem;
  margin-bottom: var(--space-xl);
}

.search-page .query {
  color: var(--accent);
}

.result-count {
  color: var(--ink-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-xl);
}

/* ───── 404 ───── */
.error-page {
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
}

.error-code {
  font-family: var(--font-en);
  font-size: 6rem;
  font-weight: 700;
  color: var(--border);
  line-height: 1;
}

.error-page h2 {
  font-size: 1.3rem;
  margin: var(--space-md) 0;
}

.error-page p {
  color: var(--ink-secondary);
  margin-bottom: var(--space-xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border);
}

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

/* ───── 页脚 ───── */
.site-footer {
  margin-top: auto;
  background: var(--bg-hero);
  color: rgba(255,255,255,0.7);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-2xl);
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
}

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

.footer-links {
  display: flex;
  gap: var(--space-2xl);
}

.footer-col h4 {
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  padding: 3px 0;
  color: rgba(255,255,255,0.5);
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  grid-column: 1 / -1;
  padding-top: var(--space-xl);
  margin-top: var(--space-xl);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
}

.footer-col .tag {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.5);
}

.footer-col .tag:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.2);
  color: #fff;
}

/* ───── 响应式 ───── */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-md); }
  .header-inner { gap: var(--space-sm); }
  .search-box input { width: 140px; font-size: 0.9rem; }
  .search-box input:focus { width: 200px; }
  .hero { padding: var(--space-2xl) 0; }
  .hero h1 { font-size: 1.8rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: var(--space-lg); }
  .hero-stat-num { font-size: 1.6rem; }
  .category-grid { grid-template-columns: 1fr 1fr; gap: var(--space-sm); }
  .category-card { padding: var(--space-lg); }
  .article-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
  }
  .article-row-meta {
    align-self: flex-end;
    gap: var(--space-sm);
  }
  .article-row h3 { font-size: 0.95rem; }
  .article-row p { font-size: 0.82rem; -webkit-line-clamp: 2; }
  .tag { font-size: 0.75rem; padding: 3px 10px; }
  .section { padding: var(--space-2xl) 0; }
  .section-title { font-size: 1.25rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: var(--space-lg); }
  .article-nav { flex-direction: column; }
  .article-nav a { max-width: 100%; }
  /* 文章详情页移动端 */
  .article-content { padding: 0 var(--space-md) var(--space-2xl); font-size: 1rem; }
  .article-content pre { font-size: 0.82rem; padding: var(--space-md); }
  .article-content table { font-size: 0.85rem; }
  .article-content th, .article-content td { padding: 8px 10px; }
}

@media (max-width: 480px) {
  .category-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
  .hero h1 { font-size: 1.5rem; }
  .hero p { font-size: 0.9rem; }
  .hero-stats { flex-wrap: wrap; gap: var(--space-md); }
  .search-box input { width: 120px; }
  .search-box input:focus { width: 160px; }
  .section-header { flex-direction: column; gap: var(--space-sm); align-items: flex-start; }
}

/* ───── 代码高亮覆盖 ───── */
.highlight { background: transparent; }
.highlight pre { margin: 0; }

/* ───── 动画 ───── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section { animation: fadeIn 0.4s ease-out; }

/* ───── 滚动条 ───── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--ink-muted); }

/* ───── 选中高亮 ───── */
::selection {
  background: var(--accent);
  color: #fff;
}

/* ───── 全部文章时间线 ───── */
.timeline-year {
  font-size: 1.4rem;
  font-weight: 700;
  margin: var(--space-xl) 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-light);
  color: var(--ink);
}

.timeline-year:first-of-type {
  margin-top: var(--space-md);
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 10px var(--space-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}

.timeline-item:hover {
  background: var(--bg-elevated);
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--ink-muted);
  min-width: 50px;
  white-space: nowrap;
}

.timeline-title {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 500;
}

/* ───── 文章目录 (TOC) ───── */

/* 桌面端：右侧悬浮 */
.toc-sidebar {
  position: fixed;
  top: 100px;
  right: 16px;
  width: 220px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  z-index: 50;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-size: 0.82rem;
  line-height: 1.5;
  scrollbar-width: thin;
}

.toc-sidebar::-webkit-scrollbar { width: 3px; }
.toc-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.toc-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.toc-list li {
  margin: 0;
}

.toc-list a {
  display: block;
  padding: 4px 8px;
  color: var(--ink-secondary);
  border-radius: 4px;
  transition: all 0.15s ease;
  text-decoration: none;
  line-height: 1.5;
  word-break: break-all;
}

.toc-list a:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.toc-list a.active {
  color: var(--accent);
  background: var(--accent-light);
  font-weight: 600;
}

.toc-list .toc-h1 {
  font-weight: 600;
  font-size: 0.85rem;
}

.toc-list .toc-h3 {
  padding-left: 20px;
  font-size: 0.78rem;
}

.toc-list .toc-h4 {
  padding-left: 32px;
  font-size: 0.75rem;
  color: var(--ink-muted);
}

/* 移动端：底部浮动按钮 + 抽屉 */
.toc-mobile-btn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  border: none;
  cursor: pointer;
  z-index: 60;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  align-items: center;
  justify-content: center;
}

.toc-mobile-btn:hover {
  transform: scale(1.08);
}

.toc-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 55vh;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: 0 -8px 30px rgba(0,0,0,0.12);
  z-index: 70;
  overflow-y: auto;
  padding: var(--space-lg);
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0px));
  transform: translateY(100%);
  visibility: hidden;
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              visibility 0.3s,
              opacity 0.3s;
}

.toc-drawer.open {
  transform: translateY(0);
  visibility: visible;
  opacity: 1;
}

.toc-drawer .toc-title {
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.toc-drawer .toc-list a {
  padding: 8px 12px;
  font-size: 0.9rem;
}

.toc-drawer .toc-h3 {
  padding-left: 24px;
  font-size: 0.85rem;
}

.toc-drawer .toc-h4 {
  padding-left: 36px;
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.toc-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 65;
  visibility: hidden;
  opacity: 0;
  transition: visibility 0.3s, opacity 0.3s;
}

.toc-overlay.open {
  visibility: visible;
  opacity: 1;
}

/* 隐藏桌面端侧边栏（当没有足够标题时） */
.toc-sidebar.hidden { display: none; }

@media (max-width: 1100px) {
  .toc-sidebar { display: none; }
  .toc-mobile-btn { display: flex; }
}

/* ──────── 侧边栏（文件树）──────── */
.sidebar-toggle { display: none; font-size: 1.3rem; line-height: 1; padding: 6px 10px; }
.sidebar-close  { display: none; }

.sidebar {
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  width: 260px;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 50;
  transition: transform 0.25s ease;
}
.sidebar-backdrop { display: none; }

body.has-sidebar .site-main { margin-left: 260px; }
body.no-sidebar .sidebar,
body.no-sidebar .sidebar-backdrop,
body.no-sidebar .sidebar-toggle { display: none !important; }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
}
.sidebar-title { font-weight: 600; font-size: 0.95rem; color: var(--ink); }

.file-tree { padding: var(--space-sm) var(--space-md) var(--space-2xl); }

.tree-node { margin: 2px 0; }
.tree-node > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 8px;
  border-radius: 6px;
  transition: background var(--transition);
  user-select: none;
}
.tree-node > summary::-webkit-details-marker { display: none; }
.tree-node > summary:hover { background: var(--border-light); }

.tree-arrow {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--ink-muted);
  transition: transform 0.15s ease;
  width: 12px;
}
.tree-node[open] > summary > .tree-arrow { transform: rotate(90deg); }

.tree-cat-name { flex: 1; font-weight: 500; font-size: 0.92rem; color: var(--ink); }
.tree-cat-count {
  font-size: 0.72rem;
  color: var(--ink-muted);
  background: var(--bg);
  padding: 1px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.tree-articles {
  list-style: none;
  padding: 0;
  margin: 2px 0 var(--space-sm) 0;
}

/* 嵌套子目录缩进：每深一层，children 容器右移 14px */
.tree-node:not(.depth-0) > .tree-children { padding-left: 14px; }
.tree-article {
  display: block;
  padding: 5px 10px 5px 30px;
  font-size: 0.85rem;
  color: var(--ink-secondary);
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--transition), color var(--transition);
}
.tree-article:hover { background: var(--border-light); color: var(--ink); }
.tree-article.active {
  background: var(--accent-light);
  color: var(--accent-hover);
  font-weight: 500;
}
[data-theme="dark"] .tree-article.active {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent);
}

.tree-cat-link a {
  display: block;
  padding: 4px 10px 4px 30px;
  font-size: 0.78rem;
  color: var(--ink-muted);
  text-decoration: none;
}
.tree-cat-link a:hover { color: var(--accent); }

/* 响应式：drawer 模式 */
@media (max-width: 1100px) {
  body.has-sidebar .site-main { margin-left: 0; }
  .sidebar {
    transform: translateX(-100%);
    box-shadow: 2px 0 12px rgba(0,0,0,0.15);
  }
  .sidebar.open { transform: translateX(0); }
  body.has-sidebar .sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .sidebar-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 64px 0 0 0;
    background: rgba(0,0,0,0.4);
    z-index: 40;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }
  .sidebar-backdrop.open { opacity: 1; pointer-events: auto; }
}

/* ───── 首页折叠交互 ───── */
.category-card-extra.hidden {
  display: none;
}

.expand-bar {
  text-align: center;
  margin-top: var(--space-lg);
}

.btn-expand {
  background: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 24px;
  font-size: 0.85rem;
  color: var(--ink-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-cn);
}

.btn-expand:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-elevated);
}

.collapsible-header {
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

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

.btn-expand-inline {
  margin-top: 0;
  padding: 4px 16px;
  font-size: 0.8rem;
}

.tag-cloud-collapsed {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
}

/* ───── 响应式内容宽度 ───── */
@media (min-width: 1600px) {
  .article-content {
    max-width: 900px;
  }
}

@media (min-width: 2000px) {
  .article-content {
    max-width: 960px;
  }
}
  transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;
  margin-top: 0;
}

.tag-cloud-expanded {
  max-height: 2000px;
  opacity: 1;
  margin-top: var(--space-md);
}

/* ───── Portal 入口横幅 (首页) ───── */
.portal-entrance {
  position: relative;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border-radius: var(--radius-lg);
  padding: 48px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: block;
  color: #fff;
  animation: entranceSlide 0.6s ease-out;
}

.portal-entrance:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.portal-entrance::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(245, 158, 11, 0.2) 0%, transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.15) 0%, transparent 40%);
}

.portal-entrance::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

.portal-entrance-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.portal-entrance-left { flex: 1; }

.portal-entrance-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: rgba(245, 158, 11, 0.2);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 20px;
  font-size: 0.75rem;
  color: #fbbf24;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.portal-entrance h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.portal-entrance p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
  max-width: 500px;
  margin: 0;
}

.portal-entrance-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.portal-entrance-icons { display: flex; }

.portal-entrance-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 12px;
  font-size: 1.4rem;
  margin-left: -8px;
  transition: transform 0.2s;
}

.portal-entrance-icon:first-child { margin-left: 0; }
.portal-entrance:hover .portal-entrance-icon { transform: translateY(-4px); }
.portal-entrance:hover .portal-entrance-icon:nth-child(2) { transition-delay: 0.05s; }
.portal-entrance:hover .portal-entrance-icon:nth-child(3) { transition-delay: 0.1s; }
.portal-entrance:hover .portal-entrance-icon:nth-child(4) { transition-delay: 0.15s; }

.portal-entrance-arrow {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  font-size: 1.2rem;
  transition: all 0.3s;
}

.portal-entrance:hover .portal-entrance-arrow {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateX(4px);
}

@keyframes entranceSlide {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .portal-entrance { padding: 32px; }
  .portal-entrance-inner { flex-direction: column; text-align: center; }
  .portal-entrance p { max-width: 100%; }
  .portal-entrance-right { justify-content: center; }
}

@media (max-width: 480px) {
  .portal-entrance { padding: 24px; }
}

/* ──────── 首页侧边栏目录导航 ──────── */
.index-sidebar .index-toc {
  padding: var(--space-md) 0;
}

.index-toc-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--ink-secondary);
  font-size: 0.95rem;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

.index-toc-link:hover {
  color: var(--ink);
  background: var(--bg-elevated);
  border-left-color: var(--accent);
}

.index-toc-link.active {
  color: var(--accent);
  background: var(--accent-light);
  border-left-color: var(--accent);
  font-weight: 600;
}

.index-toc-icon {
  font-size: 1.1rem;
  width: 24px;
  text-align: center;
}

.index-sidebar-stats {
  padding: var(--space-md);
  margin: var(--space-md) var(--space-md) var(--space-md);
  background: var(--bg-elevated);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
}

.index-stat {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
}

.index-stat-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.index-stat-label {
  font-size: 0.85rem;
  color: var(--ink-muted);
}