/**
 * Doc MDUI - Typecho 文档主题
 *
 * @package Doc MDUI
 * @author Typecho User
 * @version 1.0.0
 * @link https://typecho.org
 */

/* ========== CSS 变量 ========== */
:root {
  --sidebar-width: 260px;
  --header-height: 56px;
  --content-max-width: 860px;
  --toc-width: 220px;
}

/* ========== 基础布局 ========== */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  background-color: rgb(var(--mdui-color-surface));
  color: rgb(var(--mdui-color-on-surface));
  line-height: 1.7;
  font-size: 15px;
}

/* Material Symbols 图标基础样式 */
.material-icons-round {
  font-family: 'Material Icons Round';
  font-weight: normal;
  font-style: normal;
  font-size: 1.25em;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  vertical-align: middle;
}

/* ========== 顶部导航栏 ========== */
.top-app-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgb(var(--mdui-color-surface-container));
  border-bottom: 1px solid rgb(var(--mdui-color-outline-variant));
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
}

.top-app-bar .site-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: rgb(var(--mdui-color-on-surface));
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-app-bar .site-title:hover { color: rgb(var(--mdui-color-primary)); }

.top-app-bar .search-box {
  flex: 1;
  max-width: 360px;
  margin-left: auto;
}

.top-app-bar .search-box form {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgb(var(--mdui-color-surface-container-highest));
  border-radius: 24px;
  padding: 0 4px 0 16px;
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  transition: border-color 0.2s;
}

.top-app-bar .search-box form:focus-within {
  border-color: rgb(var(--mdui-color-primary));
}

.top-app-bar .search-box input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 8px 0;
  font-size: 0.875rem;
  color: rgb(var(--mdui-color-on-surface));
  outline: none;
}

.top-app-bar .search-box input::placeholder {
  color: rgb(var(--mdui-color-on-surface-variant));
}

.top-app-bar .search-box button {
  border: none;
  background: transparent;
  color: rgb(var(--mdui-color-on-surface-variant));
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.top-app-bar .search-box button:hover {
  color: rgb(var(--mdui-color-primary));
  background: rgb(var(--mdui-color-surface-container));
}

.mobile-menu-btn,
.theme-toggle {
  display: none;
  border: none;
  background: transparent;
  color: rgb(var(--mdui-color-on-surface-variant));
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
}

.mobile-menu-btn:hover,
.theme-toggle:hover {
  background: rgb(var(--mdui-color-surface-container-highest));
  color: rgb(var(--mdui-color-on-surface));
}

.theme-toggle { display: flex; }

.mobile-search-btn {
  display: none;
  border: none;
  background: transparent;
  color: rgb(var(--mdui-color-on-surface-variant));
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
}

.mobile-search-btn:hover {
  background: rgb(var(--mdui-color-surface-container-highest));
  color: rgb(var(--mdui-color-on-surface));
}

/* ========== 侧边栏 ========== */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background-color: rgb(var(--mdui-color-surface-container-low));
  border-right: 1px solid rgb(var(--mdui-color-outline-variant));
  overflow-y: auto;
  z-index: 90;
  padding: 12px 0;
}

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

.sidebar-nav .nav-category {
  padding: 8px 16px;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: rgb(var(--mdui-color-on-surface-variant));
  margin-top: 8px;
}

.sidebar-nav .nav-item { display: block; }

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  padding: 9px 16px;
  margin: 0 8px;
  color: rgb(var(--mdui-color-on-surface));
  text-decoration: none;
  font-size: 0.875rem;
  transition: all 0.15s;
  border-radius: 8px;
  gap: 10px;
}

.sidebar-nav .nav-link:hover {
  background-color: rgb(var(--mdui-color-surface-container-highest));
  color: rgb(var(--mdui-color-primary));
}

.sidebar-nav .nav-link.active {
  background-color: rgb(var(--mdui-color-primary-container));
  color: rgb(var(--mdui-color-on-primary-container));
  font-weight: 500;
}

.sidebar-nav .nav-link .material-icons-round {
  font-size: 1.125rem;
  opacity: 0.7;
}

/* 分类折叠 */
.sidebar-nav .nav-group { margin: 0; padding: 0; }

.sidebar-nav .nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  margin: 0 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgb(var(--mdui-color-on-surface));
  cursor: pointer;
  transition: background-color 0.15s;
  border-radius: 8px;
  user-select: none;
}

.sidebar-nav .nav-group-title:focus-visible {
  outline: 2px solid rgb(var(--mdui-color-primary));
  outline-offset: -2px;
}

.sidebar-nav .nav-group-title:hover {
  background-color: rgb(var(--mdui-color-surface-container-highest));
}

.sidebar-nav .nav-group-title .chevron {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 1.25rem;
  opacity: 0.55;
  padding: 4px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-nav .nav-group-title .chevron:hover {
  opacity: 0.9;
  background-color: rgb(var(--mdui-color-surface-container-highest));
}

.sidebar-nav .nav-group + .nav-group {
  margin-top: 2px;
}

.sidebar-nav .nav-group + .nav-link {
  margin-top: 2px;
}

.sidebar-nav .nav-group-children .nav-group {
  margin: 0;
}

.sidebar-nav .nav-group-children .nav-group + .nav-group {
  margin-top: 2px;
  border-top: none;
}

.sidebar-nav .nav-group.expanded > .nav-group-title > .chevron {
  transform: rotate(180deg);
}

.sidebar-nav .nav-group-children {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.sidebar-nav .nav-group.expanded > .nav-group-children {
  max-height: 2000px;
}

.sidebar-nav .nav-group-children .nav-link {
  font-size: 0.8125rem;
}

.sidebar-nav .doc-link {
  font-size: 0.8125rem;
  color: rgb(var(--mdui-color-on-surface-variant));
}

.sidebar-nav .doc-link:hover {
  color: rgb(var(--mdui-color-primary));
}

.sidebar-nav .doc-link.active {
  color: rgb(var(--mdui-color-on-primary-container));
  font-weight: 500;
}

/* ========== 侧栏层级缩进与样式区分 ========== */

/* ---- 二级 ---- */
.nav-group > .nav-group-children > li > .nav-link {
  padding-left: 24px;
  border-left: 3px solid rgb(var(--mdui-color-outline-variant));
  border-radius: 0 8px 8px 0;
  font-weight: 500;
}
.nav-group > .nav-group-children > li > .nav-link:hover,
.nav-group > .nav-group-children > li > .nav-link.active {
  border-left-color: rgb(var(--mdui-color-primary));
}
.nav-group > .nav-group-children > li > .nav-link.doc-link {
  padding-left: 44px;
  border-left: none;
  font-weight: 400;
}

/* ---- 三级 ---- */
.nav-group .nav-group > .nav-group-children > li > .nav-link {
  padding-left: 32px;
  border-left: 2px dashed rgb(var(--mdui-color-outline-variant));
  border-radius: 0 8px 8px 0;
  font-weight: 400;
}
.nav-group .nav-group > .nav-group-children > li > .nav-link:hover,
.nav-group .nav-group > .nav-group-children > li > .nav-link.active {
  border-left-color: rgb(var(--mdui-color-primary));
}
.nav-group .nav-group > .nav-group-children > li > .nav-link.doc-link {
  padding-left: 52px;
  border-left: none;
}

/* ---- 四级 ---- */
.nav-group .nav-group .nav-group > .nav-group-children > li > .nav-link {
  padding-left: 40px;
  border-left: 1px dotted rgb(var(--mdui-color-outline-variant));
  border-radius: 0 8px 8px 0;
  font-weight: 400;
}
.nav-group .nav-group .nav-group > .nav-group-children > li > .nav-link.doc-link {
  padding-left: 60px;
  border-left: none;
}

/* nav-group-label 样式 */
.sidebar-nav .nav-group-label {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  color: inherit;
  overflow: hidden;
  pointer-events: none;
}

.sidebar-nav .nav-group-label.active {
  color: rgb(var(--mdui-color-on-primary-container));
}

/* 各层级折叠标题缩进 */
.nav-group > .nav-group-children > li > .nav-group > .nav-group-title {
  padding-left: 24px;
}
.nav-group .nav-group > .nav-group-children > li > .nav-group > .nav-group-title {
  padding-left: 32px;
}
.nav-group .nav-group .nav-group > .nav-group-children > li > .nav-group > .nav-group-title {
  padding-left: 40px;
}

/* ========== 主内容区 ========== */
.main-wrapper {
  margin-left: var(--sidebar-width);
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.main-content {
  width: 100%;
  max-width: var(--content-max-width);
  padding: 32px 40px;
}

/* ========== 首页欢迎区域 ========== */
.hero {
  text-align: center;
  padding: 40px 0 24px;
}

.hero-icon {
  font-size: 4rem !important;
  color: rgb(var(--mdui-color-primary));
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 12px 0 8px;
}

.hero-desc {
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: 1rem;
  max-width: 520px;
  margin: 0 auto;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  padding: 10px 24px;
  background: rgb(var(--mdui-color-primary));
  color: rgb(var(--mdui-color-on-primary));
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.2s;
}

.hero-btn:hover {
  opacity: 0.9;
}

.hero-btn .material-icons-round {
  font-size: 1.125rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

/* ========== 卡片网格 ========== */
.section { margin: 24px 0; }

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 16px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  display: block;
  padding: 20px;
  background: rgb(var(--mdui-color-surface-container-low));
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
}

.card:hover {
  border-color: rgb(var(--mdui-color-primary));
  box-shadow: 0 2px 8px rgba(var(--mdui-color-shadow), 0.08);
  transform: translateY(-1px);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.card-icon {
  font-size: 1.5rem !important;
  color: rgb(var(--mdui-color-primary));
}

.card-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.card-desc {
  margin: 0 0 12px;
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: 0.8125rem;
  line-height: 1.5;
}

.card-meta {
  font-size: 0.75rem;
  color: rgb(var(--mdui-color-on-surface-variant));
}

/* ========== 文档列表 ========== */
.post-list { list-style: none; margin: 0; padding: 0; }

.post-list-item {
  padding: 20px 0;
  border-bottom: 1px solid rgb(var(--mdui-color-outline-variant));
}

.post-list-item:last-child { border-bottom: none; }

.post-list-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 6px;
}

.post-list-title a {
  color: rgb(var(--mdui-color-on-surface));
  text-decoration: none;
}

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

.post-list-excerpt {
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0 0 10px;
}

.post-list-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  flex-wrap: wrap;
}

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

/* ========== 归档标题 ========== */
.archive-title {
  font-size: 1.375rem;
  font-weight: 600;
  margin: 0 0 24px;
}

/* ========== 文档列表（分类页/搜索结果） ========== */
.doc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.doc-list-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  background: rgb(var(--mdui-color-surface-container-low));
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: all 0.15s;
}

.doc-list-item:hover {
  border-color: rgb(var(--mdui-color-primary));
  background: rgb(var(--mdui-color-surface-container));
}

.doc-list-icon {
  font-size: 1.5rem !important;
  color: rgb(var(--mdui-color-primary));
  margin-top: 2px;
  opacity: 0.8;
}

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

.doc-list-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 4px;
  color: rgb(var(--mdui-color-on-surface));
}

.doc-list-excerpt {
  margin: 0;
  font-size: 0.8125rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  line-height: 1.6;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ========== 空状态 ========== */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  background: rgb(var(--mdui-color-surface-container-low));
  border-radius: 12px;
  border: 1px solid rgb(var(--mdui-color-outline-variant));
}

.empty-icon {
  font-size: 3rem !important;
  color: rgb(var(--mdui-color-on-surface-variant));
}

.empty-state p {
  margin-top: 8px;
  color: rgb(var(--mdui-color-on-surface-variant));
}

/* ========== 目录 TOC ========== */
.toc-container {
  position: fixed;
  top: calc(var(--header-height) + 24px);
  right: 20px;
  width: var(--toc-width);
  max-height: calc(100vh - var(--header-height) - 48px);
  overflow-y: auto;
  padding: 14px;
  background-color: rgb(var(--mdui-color-surface-container-low));
  border-radius: 10px;
  border: 1px solid rgb(var(--mdui-color-outline-variant));
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgb(var(--mdui-color-on-surface-variant));
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.toc-list li { margin: 3px 0; }

.toc-link {
  display: block;
  padding: 3px 8px;
  font-size: 0.78125rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.15s;
  border-left: 2px solid transparent;
}

.toc-link:hover {
  color: rgb(var(--mdui-color-primary));
  background-color: rgb(var(--mdui-color-surface-container-highest));
}

.toc-link.active {
  color: rgb(var(--mdui-color-primary));
  border-left-color: rgb(var(--mdui-color-primary));
  background-color: rgb(var(--mdui-color-primary-container));
}

.toc-link-h3 { padding-left: 18px; }

/* ========== 分页 ========== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin: 40px 0 24px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border-radius: 8px;
  font-size: 0.875rem;
  text-decoration: none;
  transition: all 0.15s;
}

.pagination a {
  color: rgb(var(--mdui-color-on-surface));
  background-color: rgb(var(--mdui-color-surface-container));
}

.pagination a:hover {
  background-color: rgb(var(--mdui-color-surface-container-highest));
}

.pagination span.current {
  background-color: rgb(var(--mdui-color-primary));
  color: rgb(var(--mdui-color-on-primary));
}

.pagination span.prev,
.pagination span.next {
  color: rgb(var(--mdui-color-on-surface-variant));
}

/* ========== 上一篇/下一篇 ========== */
.post-nav {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.post-nav a {
  display: block;
  padding: 14px 16px;
  background: rgb(var(--mdui-color-surface-container-low));
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
}

.post-nav a:hover {
  border-color: rgb(var(--mdui-color-primary));
}

.post-nav-label {
  font-size: 0.6875rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.post-nav-title {
  font-size: 0.875rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-nav-right { text-align: right; }
.post-nav-right .post-nav-label { justify-content: flex-end; }

/* ========== 标签 ========== */
.post-tags {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgb(var(--mdui-color-outline-variant));
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.post-tags a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: rgb(var(--mdui-color-surface-container));
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  border-radius: 16px;
  font-size: 0.75rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  text-decoration: none;
  transition: all 0.15s;
}

.post-tags a:hover {
  border-color: rgb(var(--mdui-color-primary));
  color: rgb(var(--mdui-color-primary));
}

/* ========== 404 ========== */
.not-found {
  text-align: center;
  padding: 80px 20px;
}

.not-found-icon {
  font-size: 5rem !important;
  color: rgb(var(--mdui-color-primary));
  opacity: 0.3;
}

.not-found h2 {
  font-size: 5rem;
  font-weight: 700;
  margin: 0;
  color: rgb(var(--mdui-color-outline-variant));
  line-height: 1;
}

.not-found p {
  font-size: 1rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  margin: 12px 0 28px;
}

.not-found a {
  display: inline-block;
  padding: 10px 24px;
  background: rgb(var(--mdui-color-primary));
  color: rgb(var(--mdui-color-on-primary));
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.875rem;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  margin-bottom: 20px;
  font-size: 0.8125rem;
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb a {
  color: rgb(var(--mdui-color-on-surface-variant));
  text-decoration: none;
}

.breadcrumb a:hover { color: rgb(var(--mdui-color-primary)); }

.breadcrumb li:last-child {
  color: rgb(var(--mdui-color-on-surface));
  font-weight: 500;
}

/* ========== 页脚 ========== */
.site-footer {
  margin-left: var(--sidebar-width);
  padding: 24px 40px;
  border-top: 1px solid rgb(var(--mdui-color-outline-variant));
  text-align: center;
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: 0.8125rem;
}

.site-footer a {
  color: rgb(var(--mdui-color-primary));
  text-decoration: none;
}

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

.footer-powered {
  margin-top: 4px;
  font-size: 0.75rem;
}

.footer-powered a { color: rgb(var(--mdui-color-on-surface-variant)); }
.footer-powered a:hover { color: rgb(var(--mdui-color-primary)); }

.footer-custom { margin-top: 12px; }

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
  .toc-container { display: none; }
}

@media (min-width: 1201px) {
  .main-wrapper:has(.toc-container) {
    margin-right: calc(var(--toc-width) + 28px);
  }
}

@media (max-width: 768px) {
  :root { --sidebar-width: 0; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    width: 260px;
  }

  .sidebar.open { transform: translateX(0); }

  .main-wrapper { margin-left: 0; }
  .main-content { padding: 20px 16px; }

  .mobile-menu-btn { display: flex; }

  .search-box { display: none; }
  .mobile-search-btn { display: flex; margin-left: auto; }
  .site-title-text {
    max-width: 120px;
  }

  .site-footer { margin-left: 0; }

  .post-title { font-size: 1.375rem; }

  .post-nav { grid-template-columns: 1fr; }
  .post-nav-right { text-align: left; }
  .post-nav-right .post-nav-label { justify-content: flex-start; }

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

/* 分类弹窗 */
.cat-dialog {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.cat-dialog.active { display: flex; }
.cat-dialog-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0,0,0,0.4);
}
.cat-dialog-panel {
  position: relative;
  background: rgb(var(--mdui-color-surface-container-high));
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  max-height: 70vh;
  box-shadow: 0 4px 20px rgba(var(--mdui-color-shadow), 0.15);
  z-index: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.cat-dialog-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid rgb(var(--mdui-color-outline-variant));
}
.cat-dialog-header .cat-dialog-title {
  flex: 1;
}
.cat-dialog-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}
.cat-dialog-back,
.cat-dialog-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: rgb(var(--mdui-color-on-surface-variant));
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  flex-shrink: 0;
}
.cat-dialog-back:hover,
.cat-dialog-close:hover {
  background: rgb(var(--mdui-color-surface-container-highest));
}
.cat-dialog-body {
  padding: 12px 8px;
  overflow-y: auto;
}
.cat-dialog-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin: 0 4px;
  border-radius: 10px;
  color: rgb(var(--mdui-color-on-surface));
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background 0.15s;
}
.cat-dialog-item:hover {
  background: rgb(var(--mdui-color-surface-container-highest));
  color: rgb(var(--mdui-color-primary));
}
.cat-dialog-item .material-icons-round {
  font-size: 1.25rem;
  opacity: 0.7;
}
.cat-dialog-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  background: rgb(var(--mdui-color-surface-container));
  padding: 2px 8px;
  border-radius: 12px;
}

/* 遮罩层 */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.4);
  z-index: 89;
}

.sidebar-overlay.active { display: block; }

/* 移动端搜索弹窗 */
.search-dialog {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.search-dialog.active {
  display: flex;
}

.search-dialog-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.4);
}

.search-dialog-panel {
  position: relative;
  background: rgb(var(--mdui-color-surface-container-high));
  border-radius: 16px;
  padding: 20px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 4px 20px rgba(var(--mdui-color-shadow), 0.15);
  z-index: 1;
}

.search-dialog-panel form {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgb(var(--mdui-color-surface-container-highest));
  border-radius: 24px;
  padding: 0 4px 0 16px;
  border: 1px solid rgb(var(--mdui-color-outline-variant));
  transition: border-color 0.2s;
}

.search-dialog-panel form:focus-within {
  border-color: rgb(var(--mdui-color-primary));
}

.search-dialog-panel input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 12px 0;
  font-size: 1rem;
  color: rgb(var(--mdui-color-on-surface));
  outline: none;
}

.search-dialog-panel input::placeholder {
  color: rgb(var(--mdui-color-on-surface-variant));
}

.search-dialog-panel button {
  border: none;
  background: transparent;
  color: rgb(var(--mdui-color-on-surface-variant));
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-dialog-panel button:hover {
  color: rgb(var(--mdui-color-primary));
  background: rgb(var(--mdui-color-surface-container));
}