/* 首页布局（移动优先）：
   < 900px   顶栏 + 全宽正文；导航为左侧抽屉，本文目录为底部弹层，底部阅读工具条。
   ≥ 900px   左侧导航树 + 正文；本文目录为右侧浮层，右下角阅读工具条。
   ≥ 1280px  左侧导航树 + 正文 + 右侧常驻目录（滚动高亮）。
   颜色、字号、圆角等设计变量统一定义在 style.css。 */

:root {
  --anchor-offset: 72px;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 12px;
  z-index: 90;
  padding: 8px 14px;
  border: 0;
  border-radius: var(--radius-sm);
  color: #04130a;
  background: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

.skip-link:focus {
  top: 12px;
}

.icon-button {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: var(--radius);
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.icon-button:hover {
  color: var(--text);
  background: var(--surface-hover);
}

/* ---------- 手机顶栏：向下阅读时收起，向上滚动时出现 ---------- */

.mobile-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 2px;
  height: calc(56px + env(safe-area-inset-top));
  padding: env(safe-area-inset-top) 6px 0;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.25s ease;
}

.is-scrolling-down .mobile-header {
  transform: translateY(-100%);
}

.mobile-title {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0 6px;
  overflow: hidden;
  color: var(--text);
  font-size: 16px;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- 布局骨架 ---------- */

.home-shell {
  display: block;
}

.home-content {
  min-width: 0;
  padding: 20px 16px calc(104px + env(safe-area-inset-bottom));
}

.home-content:focus {
  outline: none;
}

/* 正文约 42 个汉字一行。 */
.article-view {
  max-width: 44rem;
  margin: 0 auto;
}

/* ---------- 导航：头像与搜索固定在顶部，邮箱与主题固定在底部，只有目录树滚动 ---------- */

.site-sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  width: min(86vw, 320px);
  padding: calc(16px + env(safe-area-inset-top)) 12px calc(12px + env(safe-area-inset-bottom));
  border-right: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: translateX(-105%);
  visibility: hidden;
  transition: transform 0.25s ease, visibility 0.25s;
}

.nav-open .site-sidebar {
  transform: none;
  visibility: visible;
}

.sidebar-head {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  padding: 0 0 16px;
}

.profile-row {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 4px;
  border-radius: var(--radius);
}

.profile-row:hover {
  background: var(--surface-hover);
}

.profile-avatar {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  object-fit: cover;
}

.profile-identity {
  min-width: 0;
}

.profile-identity h1 {
  margin: 0;
  color: var(--text);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.3;
}

.profile-summary {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.search-trigger {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 40px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--bg);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}

.search-trigger:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.search-trigger .ui-icon {
  width: 16px;
  height: 16px;
}

.search-trigger span {
  flex: 1 1 auto;
}

.search-trigger kbd {
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.site-nav {
  display: grid;
  flex: 1 1 auto;
  align-content: start;
  gap: 2px;
  min-height: 0;
  margin: 12px -6px 0 0;
  padding-right: 6px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.site-nav::-webkit-scrollbar {
  width: 6px;
}

.site-nav::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--border-strong);
}

.nav-topic-button {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 40px;
  padding: 6px 8px;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--text);
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
}

.nav-topic-button:hover {
  background: var(--surface-hover);
}

.nav-topic-button .ui-icon {
  width: 16px;
  height: 16px;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.nav-topic.is-expanded .nav-topic-button .ui-icon {
  transform: rotate(90deg);
}

.nav-topic.is-current > .nav-topic-button {
  color: var(--accent-text);
}

.nav-topic-title {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-count {
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.nav-topic-body {
  padding: 0 0 8px 16px;
}

.nav-category + .nav-category {
  margin-top: 4px;
}

.nav-category-title {
  padding: 8px 10px 2px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
}

.nav-article {
  display: block;
  padding: 6px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.5;
}

.nav-article:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.nav-article.active {
  border-left-color: var(--accent);
  color: var(--accent-text);
  background: var(--accent-soft);
  font-weight: 600;
}

.sidebar-footer {
  display: grid;
  flex: 0 0 auto;
  gap: 0;
  margin-top: 12px;
  padding: 8px 4px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

.profile-email {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 36px;
  color: var(--muted);
  font-size: 12px;
}

.profile-email:hover {
  color: var(--accent-text);
}

.profile-email .ui-icon {
  width: 16px;
  height: 16px;
}

.profile-email span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---------- 首页 ---------- */

.landing {
  display: grid;
  gap: 48px;
  padding-top: 8px;
}

.landing-hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.landing-avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.landing-hero h1 {
  margin: 4px 0 2px;
  color: var(--text);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.landing-role {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.landing-pitch {
  margin: 16px 0 0;
  color: var(--text-2);
  font-size: 16.5px;
  line-height: 1.8;
}

.landing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.landing-button {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.landing-button:hover {
  border-color: var(--accent-border);
  color: var(--accent-text);
}

.landing-button.is-primary {
  border-color: var(--accent);
  color: #04130a;
  background: var(--accent);
}

.landing-button.is-primary:hover {
  color: #04130a;
  background: var(--accent-strong);
}

.landing-section h2 {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
}

.recent-list {
  display: grid;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.recent-list li {
  border-bottom: 1px solid var(--border);
}

.recent-link {
  display: grid;
  gap: 2px;
  padding: 12px 4px;
}

.recent-title {
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.recent-link:hover .recent-title {
  color: var(--accent-text);
}

.recent-meta {
  color: var(--muted);
  font-size: 13px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
  gap: 12px;
}

.topic-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 8px;
  align-content: start;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  transition: border-color 0.15s ease;
}

.topic-card:hover {
  border-color: var(--accent-border);
}

.topic-card-title {
  color: var(--text);
  font-size: 16px;
  font-weight: 650;
}

.topic-card-count {
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.topic-card-desc {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.landing-upcoming {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- 正文区：面包屑、文章尾部、专题概览 ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb-sep {
  opacity: 0.6;
}

.article-end {
  display: grid;
  gap: 32px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.article-pager {
  display: grid;
  gap: 12px;
}

.pager-link {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.pager-link:hover {
  border-color: var(--accent-border);
}

.pager-link.is-next {
  grid-column: -2 / -1;
  text-align: right;
}

.pager-label {
  color: var(--muted);
  font-size: 12px;
}

.pager-title {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
}

.related-articles h2 {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.related-list {
  display: grid;
  gap: 4px;
}

.related-link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.5;
}

.related-link:hover {
  color: var(--accent-text);
  background: var(--surface-hover);
}

.topic-overview h1 {
  margin: 4px 0 8px;
  color: var(--text);
  font-size: clamp(1.6rem, 1.25rem + 1.5vw, 2rem);
  line-height: 1.3;
}

.topic-overview-desc {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 16px;
}

.overview-card {
  margin-bottom: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.overview-card h2 {
  margin: 0 0 4px;
  color: var(--text);
  font-size: 16px;
}

.overview-card p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.overview-card .overview-empty {
  margin: 0;
}

.view-placeholder {
  display: grid;
  gap: 12px;
  padding: 28px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.view-placeholder h2 {
  margin: 0;
  font-size: 20px;
}

.view-placeholder p {
  margin: 0;
  color: var(--muted);
}

.view-placeholder.is-error {
  border-color: var(--warn-border);
}

.view-placeholder.is-loading {
  padding: 8px 0;
  border: 0;
}

.skeleton-line {
  display: block;
  height: 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, var(--surface-2), var(--surface-hover), var(--surface-2));
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.2s linear infinite;
}

.skeleton-line:first-child {
  width: 60%;
  height: 28px;
}

.skeleton-line:nth-child(3n) {
  width: 82%;
}

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

  to {
    background-position: -200% 0;
  }
}

/* ---------- 本文目录（手机为底部弹层） ---------- */

.toc-panel {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  max-height: 72dvh;
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--surface);
  box-shadow: var(--shadow);
  transform: translateY(105%);
  visibility: hidden;
  transition: transform 0.25s ease, visibility 0.25s;
}

.toc-open .toc-panel {
  transform: none;
  visibility: visible;
}

.toc-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px 4px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.toc-nav {
  display: grid;
  flex: 1 1 auto;
  align-content: start;
  gap: 2px;
  min-height: 0;
  padding: 8px 8px 12px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.toc-nav a {
  padding: 6px 10px 6px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.toc-nav a.toc-sub {
  display: none;
  padding-left: 26px;
  font-size: 13px;
}

.toc-nav a.toc-sub.is-visible {
  display: block;
}

.toc-nav a:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.toc-nav a.active {
  border-left-color: var(--accent);
  color: var(--accent-text);
  background: var(--accent-soft);
}

.home-page:not(.has-article) .reader-dock {
  display: none;
}

/* ---------- 搜索（手机全屏，桌面居中弹窗） ---------- */

.search-dialog {
  width: 100vw;
  max-width: 100vw;
  height: 100dvh;
  max-height: 100dvh;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

.search-dialog[open] {
  display: flex;
  flex-direction: column;
}

.search-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: calc(8px + env(safe-area-inset-top)) 10px 8px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

.search-box input {
  flex: 1 1 auto;
  min-width: 0;
  height: 44px;
  border: 0;
  outline: 0;
  color: var(--text);
  background: transparent;
  font-size: 16px;
}

.search-box input:focus-visible {
  outline: none;
}

.search-close {
  padding: 6px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: transparent;
  font-size: 12px;
  cursor: pointer;
}

.search-results {
  flex: 1 1 auto;
  margin: 0;
  padding: 8px;
  overflow-y: auto;
  list-style: none;
  overscroll-behavior: contain;
}

.search-result {
  display: grid;
  gap: 2px;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-radius: var(--radius);
  color: var(--text);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.search-result.active {
  background: var(--accent-soft);
}

.search-result.is-section {
  padding-left: 30px;
}

.search-result-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
}

.search-result.is-section .search-result-title {
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
}

.search-result.is-section .search-result-title::before {
  content: "§ ";
  color: var(--muted);
}

.search-result-meta {
  color: var(--muted);
  font-size: 12px;
}

.search-empty {
  padding: 28px 12px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.search-hint {
  margin: 0;
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

/* 矮屏（如手机横屏）：收起次要信息，把高度留给目录区。 */
@media (max-height: 520px) {
  .profile-summary,
  .profile-email {
    display: none;
  }

  .sidebar-head {
    padding-bottom: 8px;
  }
}

@media (hover: none) {
  .search-trigger kbd,
  .search-hint {
    display: none;
  }
}

/* ---------- ≥ 900px：常驻左侧导航，目录改为右侧浮层 ---------- */

@media (min-width: 900px) {
  :root {
    --anchor-offset: 24px;
  }

  .mobile-header,
  .sidebar-close,
  .toc-panel .sheet-handle {
    display: none;
  }

  .home-shell {
    display: grid;
    grid-template-columns: 272px minmax(0, 1fr);
    align-items: start;
  }

  .site-sidebar {
    position: sticky;
    z-index: auto;
    width: auto;
    height: 100dvh;
    padding: 20px 14px 12px;
    box-shadow: none;
    transform: none;
    visibility: visible;
    transition: none;
  }

  .home-content {
    padding: 40px 40px 120px;
  }

  .toc-panel {
    top: 16px;
    right: 16px;
    bottom: 16px;
    left: auto;
    width: 320px;
    max-height: none;
    padding-top: 12px;
    border-bottom: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transform: translateX(110%);
  }

  .article-pager {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing {
    padding-top: 24px;
  }

  .landing-hero {
    gap: 24px;
  }

  .landing-avatar {
    width: 88px;
    height: 88px;
  }

  .search-dialog {
    width: min(640px, calc(100vw - 48px));
    height: auto;
    max-height: min(72dvh, 640px);
    margin: 10dvh auto auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
  }

  .search-box {
    padding: 8px 10px 8px 16px;
  }
}

/* ---------- ≥ 1280px：三栏，目录常驻右侧并随滚动高亮 ---------- */

@media (min-width: 1280px) {
  .home-shell {
    grid-template-columns: 272px minmax(0, 1fr) 240px;
  }

  .home-content {
    padding: 48px 48px 120px;
  }

  .inline-article-body {
    font-size: 16.5px;
  }

  .toc-panel {
    position: sticky;
    top: 0;
    right: auto;
    bottom: auto;
    z-index: auto;
    width: auto;
    height: 100dvh;
    padding: 48px 16px 24px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    transform: none;
    visibility: visible;
    transition: none;
  }

  .home-page:not(.has-toc) .toc-panel {
    visibility: hidden;
  }

  .toc-panel-head {
    padding: 0 10px 8px 14px;
    border-bottom: 0;
  }

  .toc-close,
  .home-page .reader-dock {
    display: none;
  }

  .toc-nav {
    padding: 0 0 12px;
  }

  .toc-nav a {
    font-size: 13px;
  }

  .toc-nav a.toc-sub {
    font-size: 12px;
  }

  .toc-panel .toc-top-button {
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-header,
  .site-sidebar,
  .toc-panel,
  .nav-topic-button .ui-icon {
    transition: none;
  }

  .skeleton-line {
    animation: none;
  }
}

@media print {
  .mobile-header,
  .site-sidebar,
  .toc-panel,
  .article-end,
  .breadcrumb {
    display: none;
  }

  .home-shell {
    display: block;
  }

  .home-content {
    padding: 0;
  }
}