/* ui-v2: editorial reading room, separate navigation and paper roles. */
:root {
  --color-ink: #253344;
  --color-secondary: #596578;
  --color-muted: #606b7d;
  --color-accent: #a95022;
  --color-accent-strong: #843d17;
  --color-selected: #fcf0e5;
  --color-canvas: #edf0f4;
  --color-surface: #fffefd;
  --color-page: #f4f5f7;
  --color-line: #dce0e6;
  --color-line-strong: #7b8798;
  --color-soft: #f1f3f6;
  --color-warning: #845220;
  --color-warning-surface: #fff5e6;
  --nav-ink: #edf2f8;
  --nav-muted: #b9c7d6;
  --nav-surface: #152c41;
  --nav-card: #213c53;
  --nav-line: #6e879d;
  --nav-selected: #2e4e67;
  --nav-accent: #f4bf86;
  --font-ui: 'Segoe UI','Microsoft YaHei UI','Microsoft YaHei','PingFang SC',sans-serif;
  --font-reading: 'Microsoft YaHei','PingFang SC','Noto Sans CJK SC',sans-serif;
  --font-serif: 'Reader Serif','Noto Serif CJK SC','Source Han Serif SC','Songti SC',serif;
  --ink: var(--color-ink);
  --ink-soft: var(--color-secondary);
  --ink-faint: var(--color-muted);
  --pine: var(--color-accent);
  --pine-deep: var(--color-ink);
  --paper: var(--color-page);
  --paper-bright: var(--color-surface);
  --paper-dim: var(--color-soft);
  --line: var(--color-line);
  --line-dark: var(--color-line-strong);
  --vermilion: var(--color-accent);
  --vermilion-soft: var(--color-selected);
  --ochre: var(--color-warning);
  --sage: var(--color-soft);
  --sans: var(--font-ui);
  --serif: var(--font-serif);
  --text-muted: var(--color-secondary);
  --muted: var(--color-secondary);
  --border: var(--color-line);
  --shadow: 0 16px 48px #152c411a;
  --radius: 8px
}

html {
  background: var(--color-page)
}

body {
  background: var(--color-page);
  color: var(--color-ink);
  font: 15px/1.6 var(--font-ui);
  -webkit-font-smoothing: antialiased
}

button,input,select,textarea {
  font: inherit
}

a,button,summary {
  -webkit-tap-highlight-color: transparent
}

button {
  touch-action: manipulation
}

button:disabled {
  cursor: default;
  opacity: .5
}

::selection {
  background: #f5d6b8;
  color: #152c41
}

input {
  caret-color: var(--color-accent)
}

:is(button,a,input,select,summary,textarea):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px
}

.ui-icon {
  width: 20px;
  height: 20px;
  flex: none;
  vertical-align: middle
}

.visually-hidden {
  position: absolute!important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 20px;
  z-index: 100;
  border: 0;
  padding: 12px 18px;
  background: var(--color-accent);
  color: white;
  border-radius: 4px
}

.skip-link:focus {
  top: 10px
}

/* The global shelf */
.topbar {
  height: 76px;
  min-height: 76px;
  padding: 0 32px;
  background: var(--color-surface);
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
  box-shadow: none;
  gap: 24px
}

.brand {
  gap: 12px;
  min-width: 168px
}

.brand-mark {
  width: 36px;
  height: 40px;
  background: var(--nav-surface);
  color: var(--nav-accent);
  border-radius: 3px 9px 3px 3px
}

.brand-mark .ui-icon {
  width: 23px;
  height: 23px
}

.brand-title strong {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--color-ink)
}

.brand-title span {
  font: 11px/1.4 var(--font-ui);
  letter-spacing: .12em;
  color: var(--color-secondary);
  margin-top: 6px
}

.library-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-right: auto
}

.library-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-secondary);
  font-size: 14px;
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color 160ms
}

.library-nav a[aria-current=page] {
  color: var(--color-ink);
  font-weight: 600
}

.library-nav a[aria-current=page]::after {
  content: '';
  position: absolute;
  height: 3px;
  background: var(--color-accent);
  bottom: -16px;
  left: 0;
  right: 0;
  border-radius: 2px 2px 0 0
}

.library-nav a:hover {
  color: var(--color-accent)
}

.topbar-actions {
  gap: 16px
}

.topbar .button-quiet {
  display: flex;
  gap: 7px;
  align-items: center;
  color: var(--color-secondary);
  background: none;
  border: 0;
  min-height: 44px
}

.topbar .button-quiet .ui-icon {
  width: 18px;
  height: 18px
}

.dataset-picker>span {
  display: none
}

.dataset-picker select {
  min-height: 38px;
  max-width: 170px;
  background: var(--color-soft);
  border: 1px solid var(--color-line-strong);
  border-radius: 6px;
  color: var(--color-ink);
  font-size: 13px;
  padding: 6px 24px 6px 12px
}

.workspace {
  max-width: 1680px;
  margin: 0 auto;
  background: var(--color-page)
}

.workspace.pinned-library {
  display: block;
  max-width: none
}

.main-column {
  min-width: 0;
  padding: 36px 40px 64px
}

.pinned-library>.main-column {
  max-width: 1280px;
  margin: 0 auto;
  padding: 44px 48px 72px
}

.pinned-library.column-workspace>.main-column {
  padding: 0;
  max-width: none
}

.sidebar {
  background: var(--color-surface);
  border-color: var(--color-line)
}

.sidebar .is-active,.nav-list a.is-active {
  background: var(--color-selected);
  color: var(--color-accent)
}

.panel {
  background: var(--color-surface);
  border-color: var(--color-line);
  box-shadow: none;
  border-radius: 8px
}

.button {
  border-radius: 6px;
  min-height: 40px;
  padding: 9px 16px;
  transition: background 160ms,color 160ms,border-color 160ms
}

.button-accent {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent)
}

.button-secondary {
  color: var(--color-ink);
  background: var(--color-surface);
  border-color: var(--color-line-strong)
}

.button-quiet {
  background: none;
  color: var(--color-secondary)
}

.page-title,.article-head h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-ink);
  text-wrap: pretty
}

.page-title,.article-head h1 {
  font-size: 36px
}

.eyebrow {
  color: var(--color-accent);
  letter-spacing: .06em;
  font: 12px/1.8 var(--font-ui)
}

.result-list {
  border-top: 1px solid var(--color-line)
}

.result-item {
  border: 0;
  border-bottom: 1px solid var(--color-line);
  border-radius: 0;
  background: transparent;
  padding: 26px 0;
  transition: background 160ms
}

.result-item:hover {
  background: var(--color-surface)
}

.result-item h3 {
  color: var(--color-ink);
  font: 600 23px/1.6 var(--font-serif);
  margin: 10px 0
}

.result-item>p {
  max-width: 60em;
  color: var(--color-secondary);
  font-size: 14px;
  line-height: 1.85
}

.result-meta {
  font-size: 12px;
  color: var(--color-secondary);
  gap: 16px
}

.tag,.badge {
  background: var(--color-soft);
  color: var(--color-secondary);
  border-color: var(--color-line);
  border-radius: 4px
}

.badge-accent {
  background: var(--color-selected);
  color: var(--color-accent-strong)
}

.badge-pine {
  background: #e8edf3;
  color: #344f6b
}

.search-form {
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-surface);
  padding: 20px
}

.field input,.field select,.field textarea {
  min-height: 44px;
  border-radius: 5px;
  border-color: var(--color-line-strong);
  background: var(--color-surface);
  color: var(--color-ink)
}

.pinned-topic-search {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  align-items: end;
  gap: 16px;
  margin: 24px 0
}

.section-heading h2,.panel-title {
  font-family: var(--font-serif);
  color: var(--color-ink)
}

.coverage-grid {
  gap: 16px
}

.coverage-item {
  background: var(--color-surface);
  border-color: var(--color-line);
  border-radius: 8px;
  padding: 24px
}

.coverage-item strong {
  color: var(--color-ink);
  font-size: 30px
}

.coverage-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  border-bottom: 1px solid var(--color-line);
  margin: 24px 0 8px
}

.coverage-filters a {
  min-height: 44px;
  padding: 12px 0;
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 14px
}

.coverage-filters a[aria-current=page] {
  color: var(--color-accent);
  box-shadow: inset 0 -2px var(--color-accent)
}

/* Exploring and reading occupy a single viewport */
.pinned-column {
  position: relative;
  --reading-size: 18px;
  --reading-font: var(--font-serif)
}

.column-layout {
  display: grid;
  grid-template-columns: var(--column-nav-width,minmax(340px,36%)) minmax(0,1fr);
  border: 0;
  border-radius: 0;
  overflow: hidden
}

.is-outline .column-layout {
  grid-template-columns: var(--column-nav-width,328px) minmax(0,1fr)
}

.column-map,.column-reading-panel {
  height: calc(100dvh - 76px);
  min-height: 460px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  position: relative;
  border: 0;
  border-radius: 0
}

.column-map {
  background: var(--nav-surface);
  color: var(--nav-ink);
  border-right: 1px solid var(--nav-surface)
}

.column-header {
  display: block;
  flex: none;
  padding: 28px 24px 20px;
  margin: 0;
  border: 0
}

.column-heading {
  display: grid;
  gap: 8px
}

.column-library-label {
  color: var(--nav-muted);
  font-size: 11px;
  letter-spacing: .02em
}

.column-heading h1 {
  font: 600 30px/1.5 var(--font-serif);
  margin: 0;
  color: var(--nav-ink);
  letter-spacing: 0
}

.column-heading>span:last-child {
  color: var(--nav-muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums
}

.column-search {
  width: 100%;
  margin-top: 22px
}

.column-search-field {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 8px 0 12px;
  background: #203a51;
  border: 1px solid var(--nav-line);
  border-radius: 7px;
  color: var(--nav-muted)
}

.column-search-field>.ui-icon {
  width: 17px;
  height: 17px
}

.column-search-field input {
  width: 100%;
  min-width: 0;
  height: 42px;
  border: 0;
  outline: 0;
  background: none;
  font-size: 13px;
  color: var(--nav-ink);
  padding: 0
}

.column-search-field input::placeholder {
  color: var(--nav-muted)
}

.column-search-field:focus-within {
  outline: 2px solid var(--nav-accent);
  outline-offset: 3px
}

.column-search-field kbd {
  font: 11px var(--mono);
  padding: 1px 5px;
  border: 1px solid var(--nav-line);
  border-radius: 3px
}

.column-search-field button {
  display: grid;
  place-items: center;
  width: 32px;
  height: 36px;
  border: 0;
  border-radius: 4px;
  padding: 0;
  background: transparent;
  color: var(--nav-ink)
}

.column-search-field button:hover {
  background: var(--nav-selected)
}

.column-map-toolbar,.column-reading-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 52px;
  padding: 8px 24px;
  flex: none
}

.column-map-toolbar {
  background: var(--nav-surface);
  border-bottom: 1px solid #425d73
}

.column-reading-toolbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-secondary)
}

.column-view-switch {
  display: flex;
  gap: 4px;
  padding: 3px;
  background: #102437;
  border-radius: 6px
}

.column-view-switch button {
  display: flex;
  align-items: center;
  gap: 5px;
  min-height: 32px;
  padding: 4px 14px;
  border: 0;
  border-radius: 4px;
  background: none;
  color: var(--nav-muted);
  font-size: 12px
}

.column-view-switch button[aria-pressed=true] {
  color: var(--nav-surface);
  background: var(--nav-accent);
  font-weight: 600
}

.column-map-menu,.column-settings {
  position: relative;
  font-size: 12px
}

.column-map-menu summary,.column-settings summary {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  cursor: pointer;
  min-height: 36px;
  padding: 6px 8px;
  border-radius: 4px
}

summary::-webkit-details-marker {
  display: none
}

.column-map-menu summary {
  color: var(--nav-muted)
}

.column-map-menu summary>.ui-icon,.column-settings summary>.ui-icon {
  width: 12px;
  height: 12px;
  transform: rotate(90deg)
}

.column-map-menu[open]>summary {
  color: var(--nav-ink);
  background: var(--nav-selected)
}

.column-settings[open]>summary {
  background: var(--color-soft)
}

.column-map-menu>div,.column-settings-content {
  position: absolute;
  right: 0;
  top: 42px;
  z-index: 12;
  width: 210px;
  padding: 8px;
  background: var(--color-surface);
  color: var(--color-ink);
  border: 1px solid var(--color-line-strong);
  border-radius: 8px;
  box-shadow: var(--shadow)
}

.column-map-menu button {
  display: block;
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border: 0;
  border-radius: 4px;
  background: none;
  text-align: left;
  font-size: 13px;
  color: var(--color-ink)
}

.column-map-menu button:hover {
  background: var(--color-selected)
}

.is-outline [data-column-action=fit] {
  display: none
}

.column-settings-content {
  width: 250px;
  padding: 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px 12px;
  align-items: center;
  font-size: 13px
}

.column-size-controls {
  display: flex;
  gap: 6px;
  align-items: center
}

.column-reading-toolbar>div {
  display: flex;
  gap: 16px;
  align-items: center
}

.column-reading-toolbar button {
  min-height: 36px;
  padding: 6px 10px;
  border: 0;
  border-radius: 5px;
  background: none;
  color: var(--color-secondary);
  font-size: 12px
}

.column-reading-toolbar button:hover:not(:disabled) {
  background: var(--color-selected);
  color: var(--color-accent)
}

.column-reading-toolbar [data-column-action=focus] {
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap
}

.column-reading-toolbar .ui-icon {
  width: 15px;
  height: 15px
}

.column-font-choice {
  border: 1px solid var(--color-line-strong)!important
}

.column-text-size {
  min-width: 20px;
  text-align: center;
  font-variant-numeric: tabular-nums
}

.column-reading-progress {
  font-size: 12px;
  font-variant-numeric: tabular-nums
}

.column-progress-track {
  height: 2px;
  flex: none;
  background: var(--color-soft)
}

.column-progress-track>div {
  width: 0;
  height: 100%;
  background: var(--color-accent)
}

.column-breadcrumb {
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 45px;
  padding: 4px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
  font-size: 12px;
  overflow: visible
}

.column-breadcrumb button {
  border: 0;
  min-height: 34px;
  padding: 6px 8px;
  background: none;
  color: var(--color-secondary);
  text-align: left;
  font-size: 12px
}

.column-back {
  flex: none;
  white-space: nowrap
}

.column-back:hover:not(:disabled) {
  color: var(--color-accent)
}

.column-current-path {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--color-secondary);
  min-width: 0
}

.column-path-menu {
  position: relative;
  flex: none
}

.column-path-menu summary {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  cursor: pointer;
  min-height: 34px;
  color: var(--color-secondary)
}

.column-path-menu summary>.ui-icon {
  width: 14px;
  height: 14px
}

.column-path-menu summary>.ui-icon:last-child {
  width: 10px;
  transform: rotate(90deg)
}

.column-path-menu>div {
  position: absolute;
  left: 0;
  top: 40px;
  z-index: 11;
  width: min(420px,calc(100vw - 48px));
  padding: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: 8px;
  box-shadow: var(--shadow);
  max-height: 50vh;
  overflow: auto
}

.column-path-menu button {
  display: flex;
  gap: 12px;
  width: 100%;
  min-height: 44px;
  line-height: 1.7
}

.column-path-menu button small {
  color: var(--color-accent)
}

.column-path-menu button:hover {
  background: var(--color-selected)
}

/* Source topology, with independent node selection and branch expansion */
.column-viewport {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
  background-image: radial-gradient(#5a748b70 .7px,transparent .7px);
  background-size: 24px 24px
}

.column-viewport.is-dragging {
  cursor: grabbing
}

.column-map-stage {
  position: relative;
  transform-origin: 0 0
}

.column-wires {
  position: absolute;
  inset: 0;
  overflow: visible;
  pointer-events: none
}

.column-wires path {
  fill: none;
  stroke: var(--nav-line);
  stroke-width: 1.4
}

.column-node {
  position: absolute;
  width: 272px;
  background: var(--nav-card);
  border: 1px solid var(--nav-line);
  border-radius: 7px;
  box-shadow: 0 4px 12px #06152518
}

.column-node.is-selected {
  background: var(--nav-selected);
  border-color: var(--nav-accent);
  box-shadow: inset 3px 0 var(--nav-accent)
}

.column-node.is-cycle {
  border-style: dashed
}

.column-node-title {
  display: block;
  width: 100%;
  min-height: 58px;
  padding: 16px 66px 16px 16px;
  background: none;
  border: 0;
  text-align: left;
  color: var(--nav-ink);
  font-size: 14px;
  line-height: 1.7;
  font-weight: 400;
  overflow-wrap: anywhere
}

.column-node-title:hover {
  color: var(--nav-accent)
}

.column-node.is-selected .column-node-title {
  color: var(--nav-accent);
  font-weight: 600
}

.column-node.section .column-node-title {
  font-weight: 500
}

.column-node-meta {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--nav-muted)
}

.column-node-meta>span {
  display: none
}

.column-node:is(.reference,.blocked,.pending,.missing,.preview,.is-cycle) .column-node-meta {
  position: static;
  transform: none;
  padding: 0 12px 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center
}

.column-node:is(.reference,.blocked,.pending,.missing,.preview,.is-cycle) .column-node-meta>span {
  display: block
}

.column-node-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 44px;
  min-height: 38px;
  padding: 4px;
  border: 0;
  border-radius: 5px;
  background: none;
  color: var(--nav-muted);
  font-size: 12px
}

.column-node-toggle .ui-icon {
  width: 12px;
  height: 12px;
  transition: transform 180ms
}

.column-node-toggle[aria-expanded=true] .ui-icon {
  transform: rotate(90deg)
}

.column-node-toggle:hover {
  background: var(--nav-selected);
  color: var(--nav-accent)
}

.column-more {
  display: block;
  width: 100%;
  padding: 16px;
  border: 0;
  border-radius: 6px;
  background: var(--nav-card);
  color: var(--nav-accent)
}

.column-map-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex: none;
  min-height: 44px;
  padding: 5px 16px;
  border-top: 1px solid #425d73;
  color: var(--nav-muted);
  font-size: 11px;
  background: var(--nav-surface)
}

.column-map-bottom>div {
  display: flex;
  align-items: center;
  gap: 3px
}

.column-map-bottom button {
  min-width: 32px;
  min-height: 32px;
  padding: 3px;
  border: 0;
  border-radius: 4px;
  background: none;
  color: var(--nav-ink);
  font-size: 17px
}

.column-map-bottom button:hover {
  background: var(--nav-selected)
}

.column-zoom {
  min-width: 38px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 12px
}

.is-outline .column-viewport {
  overflow: auto;
  background: none;
  cursor: auto;
  touch-action: auto;
  padding: 8px 0 24px;
  scrollbar-color: var(--nav-line) var(--nav-surface)
}

.is-outline .column-map-stage {
  transform: none!important
}

.is-outline .column-node {
  position: relative;
  left: auto!important;
  top: auto!important;
  width: auto;
  margin: 0;
  background: none;
  border: 0;
  border-radius: 0;
  box-shadow: none
}

.is-outline .column-node-title {
  min-height: 44px;
  padding: 12px 60px 12px calc(20px + var(--depth)*14px);
  font-size: 13px;
  line-height: 1.8
}

.is-outline .column-node.is-selected {
  background: var(--nav-selected);
  box-shadow: inset 3px 0 var(--nav-accent)
}

.is-outline .column-node-title:hover {
  background: var(--nav-card)
}

.is-outline .column-node.section[data-depth='1'] {
  margin-top: 12px
}

.is-outline .column-node.section[data-depth='1'] .column-node-title {
  font-weight: 600;
  color: var(--nav-ink)
}

.is-outline .column-node:is(.reference,.blocked,.pending,.missing,.preview,.is-cycle) .column-node-meta {
  padding-left: calc(20px + var(--depth)*14px)
}

.is-outline .column-map-bottom>div {
  display: none
}

.column-map :is(button,input,summary):focus-visible {
  outline-color: var(--nav-accent)
}

.column-search-results {
  flex: 1;
  min-height: 160px;
  max-height: none;
  overflow: auto;
  position: relative;
  z-index: 3;
  margin: 0 16px 12px;
  padding: 14px 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-ink)
}

.column-search-results[hidden] {
  display: none
}

.column-result-heading {
  position: sticky;
  top: -14px;
  z-index: 2;
  background: var(--color-surface);
  padding: 6px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-secondary)
}

.column-result-heading button {
  border: 0;
  background: none;
  color: var(--color-secondary);
  padding: 8px;
  min-height: 44px
}

.column-search-item {
  display: block;
  width: 100%;
  padding: 16px 0;
  border: 0;
  border-top: 1px solid var(--color-line);
  background: none;
  text-align: left;
  color: var(--color-ink)
}

.column-search-item:hover {
  background: var(--color-selected)
}

.column-search-item strong {
  font-size: 14px;
  line-height: 1.7;
  font-weight: 600
}

.column-search-item span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.7;
  color: var(--color-secondary);
  margin-top: 6px
}

.column-map:has(.column-search-results:not([hidden])) :is(.column-viewport,.column-map-toolbar,.column-map-bottom) {
  display: none
}

.column-all-results {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  color: var(--color-accent);
  text-decoration: none;
  border-top: 1px solid var(--color-line);
  margin-top: 8px
}

.page-intro h1 {
  font: 600 42px/1.5 var(--font-serif);
  letter-spacing: 0
}

.page-intro p {
  font-size: 15px;
  line-height: 1.9
}

.search-toolbar {
  background: var(--color-surface);
  border-radius: 8px;
  padding: 18px;
  border-color: var(--color-line)
}

.button:hover {
  transform: none;
  background: var(--color-accent-strong);
  color: white
}

.button-secondary:hover,.button-quiet:hover {
  background: var(--color-soft);
  color: var(--color-ink)
}

.hero {
  background: var(--nav-surface);
  border-radius: 8px;
  box-shadow: none
}

.hero::after {
  display: none
}

.hero h1 {
  font: 600 40px/1.5 var(--font-serif);
  letter-spacing: 0
}

.hero p {
  color: var(--nav-muted);
  font-size: 15px;
  line-height: 1.9
}

.hero-meta {
  color: var(--nav-muted)
}
.hero .eyebrow { color:var(--nav-accent); }
.hero .button-secondary { background:transparent;color:var(--nav-ink);border-color:var(--nav-line); }
.hero .button-secondary:hover { background:var(--nav-card);color:var(--nav-ink); }
.stat-value { color:var(--color-ink); }
.column-nav-entry { display:flex;align-items:center;gap:10px;width:100%;min-height:44px;padding:10px;border:0;border-bottom:1px solid var(--color-line);background:none;color:var(--color-ink);text-align:left;font:500 13px/1.7 var(--font-ui);margin-bottom:8px; }
.column-nav-entry .ui-icon { width:18px;height:18px;color:var(--color-accent); }
.column-nav-entry:hover { background:var(--color-selected); }
.brand { min-height:44px; }

/* Exact author text is typeset without rewriting it. */
.column-reading-panel {
  background: var(--color-surface)
}

.column-reader {
  flex: 1;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 32px clamp(28px,4.5vw,76px) 88px;
  scrollbar-gutter: stable;
  scrollbar-color: var(--color-line-strong) var(--color-surface)
}

.column-reader:focus-visible,.column-viewport:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -3px
}

.column-reader>* {
  max-width: calc(var(--reading-size)*34);
  margin-left: auto;
  margin-right: auto;
  overflow-wrap: anywhere
}

.column-article-head h2 {
  font: 600 clamp(28px,2.6vw,39px)/1.55 var(--font-serif);
  margin: 12px 0 14px;
  letter-spacing: 0;
  text-wrap: pretty;
  color: var(--color-ink)
}

.column-status {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--color-secondary);
  font: 11px/1.6 var(--font-ui);
  letter-spacing: .08em
}

.column-status::before {
  content: '';
  width: 16px;
  height: 2px;
  background: var(--color-accent)
}

.column-article-head>p {
  margin: 0 0 10px;
  color: var(--color-secondary);
  font: 12px/1.8 var(--font-ui)
}

.column-source {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font: 12px/1.8 var(--font-ui);
  margin-bottom: 14px
}

.column-source>a {
  color: var(--color-secondary);
  text-decoration: none
}

.column-source>a:hover {
  color: var(--color-accent);
  text-decoration: underline
}

.column-source details {
  color: var(--color-secondary)
}

.column-source summary {
  cursor: pointer
}

.column-source small {
  display: block;
  padding: 8px 0;
  font-size: 12px
}

.column-points,.column-page-index {
  margin: 12px auto;
  border: 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: none;
  border-radius: 0;
  padding: 0
}

.column-points>summary,.column-page-index>summary {
  display: flex;
  align-items: center;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  min-height: 48px;
  padding: 12px 0;
  font-size: 13px
}

.column-points>summary strong {
  font-weight: 600
}

.column-points>summary span,.column-page-index>summary span {
  color: var(--color-secondary);
  font-size: 12px
}

.column-points>summary::after {
  content: '展开';
  margin-left: auto;
  color: var(--color-accent);
  font-size: 12px
}

.column-points[open]>summary::after {
  content: '收起'
}

.column-points-content {
  padding: 8px 0 22px
}

.column-summary-note {
  font: 12px/1.7 var(--font-ui);
  color: var(--color-secondary);
  margin: 0 0 12px
}

.column-points ul {
  margin: 0;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--color-ink)
}

.column-points li+li {
  margin-top: 10px
}

.column-page-index>summary>.ui-icon {
  margin-left: auto;
  width: 14px;
  height: 14px;
  transform: rotate(90deg)
}

.column-page-index[open]>summary>.ui-icon {
  transform: rotate(-90deg)
}

.column-page-index nav {
  display: grid;
  max-height: 250px;
  overflow: auto;
  padding: 0 0 16px
}

.column-page-index button {
  min-height: 40px;
  padding: 8px 0;
  border: 0;
  background: none;
  text-align: left;
  color: var(--color-secondary);
  font-size: 13px;
  line-height: 1.7
}

.column-page-index button:hover {
  color: var(--color-accent)
}

.column-original {
  margin-top: 24px
}

.column-original>h3 {
  display: none;
  margin: 0 0 22px;
  font: 12px/1.8 var(--font-ui);
  color: var(--color-secondary);
  letter-spacing: .08em
}

.article-body {
  color: var(--color-ink);
  font: 400 18px/1.95 var(--font-serif);
  max-width: 34em;
  line-break: strict;
  overflow-wrap: anywhere
}

.column-original .article-body {
  max-width: none;
  font-size: var(--reading-size);
  font-family: var(--reading-font);
  line-height: 1.95;
  padding: 0
}

.article-body p {
  margin: 0 0 1.4em
}

.article-body a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px
}

.article-body a:hover {
  color: var(--color-accent-strong)
}

.article-body :is(h1,h2,h3,h4,h5,h6) {
  font-family: var(--font-serif);
  color: var(--color-ink);
  line-height: 1.65;
  letter-spacing: 0;
  margin: 1.7em 0 .8em;
  font-weight: 600
}

.article-body h1 {
  font-size: 1.7em
}

.article-body h2 {
  font-size: 1.5em
}

.article-body h3 {
  font-size: 1.25em
}

.article-body ul,.article-body ol {
  padding-left: 1.5em;
  margin: 0 0 1.4em
}

.article-body li {
  margin-bottom: .55em
}

.article-body :is(img,video) {
  max-width: 100%;
  height: auto
}

.article-body figure {
  margin: 24px 0
}

.article-body figcaption {
  color: var(--color-secondary);
  font: 12px/1.8 var(--font-ui)
}

.article-body blockquote {
  margin: 24px 0;
  border-left: 3px solid var(--color-accent);
  padding: 12px 22px;
  background: var(--color-soft)
}

.column-next,.column-files {
  border-top: 1px solid var(--color-line);
  margin-top: 48px;
  padding-top: 24px
}

.column-next h3,.column-files h3 {
  font: 600 20px/1.6 var(--font-serif);
  margin: 0 0 16px
}

.column-next h3 small {
  display: block;
  margin-top: 6px;
  font: 12px/1.7 var(--font-ui);
  color: var(--color-secondary)
}

.column-next-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: next
}

.column-next-list li {
  border-bottom: 1px solid var(--color-line)
}

.column-next-list button {
  display: flex;
  gap: 18px;
  align-items: baseline;
  width: 100%;
  min-height: 52px;
  padding: 16px 0;
  background: none;
  border: 0;
  text-align: left
}

.column-next-list button::before {
  counter-increment: next;
  content: counter(next,decimal-leading-zero);
  font: 12px var(--mono);
  color: var(--color-accent)
}

.column-next-list strong {
  flex: 1;
  font: 500 15px/1.8 var(--font-ui);
  color: var(--color-ink)
}

.column-next-list span {
  color: var(--color-secondary);
  font-size: 11px;
  white-space: nowrap
}

.column-next-list button:hover strong {
  color: var(--color-accent)
}

.column-load-more {
  min-height: 44px;
  padding: 12px 16px;
  margin-top: 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-accent);
  font-size: 13px
}

.column-gap {
  padding: 18px;
  background: var(--color-warning-surface);
  color: var(--color-warning);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  font-size: 14px;
  line-height: 1.85
}

.column-files li {
  font-size: 14px;
  line-height: 1.9
}

.column-files small {
  display: block;
  color: var(--color-secondary);
  font-size: 12px
}

.column-footnote {
  display: none
}

.column-mobile-tools {
  display: none
}

/* A full canvas is available when exploring several levels of source links. */
body.is-map-focused { overflow:hidden; }
body.is-map-focused .column-workspace { position:fixed;inset:76px 0 0;z-index:18; }
.pinned-column.is-map-focused .column-layout { grid-template-columns:1fr; }
.pinned-column.is-map-focused :is(.column-reading-panel,.column-resizer,.column-mobile-tools) { display:none; }
.pinned-column.is-map-focused .column-map { height:calc(100dvh - 76px);min-height:0; }
.pinned-column.is-map-focused .column-header { display:flex;align-items:center;justify-content:space-between;gap:32px;padding:20px 32px; }
.pinned-column.is-map-focused .column-heading { grid-template-columns:auto auto;align-items:baseline;gap:0 20px; }
.pinned-column.is-map-focused .column-library-label { grid-column:1/-1; }
.pinned-column.is-map-focused .column-heading h1 { font-size:26px; }
.pinned-column.is-map-focused .column-search { width:380px;max-width:45%;margin:0; }
.is-outline [data-column-action=map-focus] { display:none; }
@media(max-width:800px) {
  body.is-map-focused .topbar { display:none; }
  body.is-map-focused .column-workspace { inset:0;z-index:25; }
  .pinned-column.is-map-focused .column-map { height:100dvh; }
  .pinned-column.is-map-focused .column-header { display:block;padding:20px; }
  .pinned-column.is-map-focused .column-search { width:100%;max-width:none;margin-top:14px; }
  .column-search-field input { height:44px; }
}

/* Focus retains reading controls and removes the global shelf. */
body.is-column-focused {
  overflow: hidden
}

body.is-column-focused .topbar {
  display: none
}

body.is-column-focused .column-workspace {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: var(--color-surface)
}

.pinned-column.is-reading-focused .column-layout {
  grid-template-columns: minmax(0,1fr)
}

.pinned-column.is-reading-focused :is(.column-map,.column-breadcrumb,.column-mobile-tools,.column-footnote,.column-points,.column-page-index) {
  display: none
}

.pinned-column.is-reading-focused .column-reading-panel {
  height: 100dvh;
  min-height: 0
}

.pinned-column.is-reading-focused .column-reading-toolbar {
  min-height: 48px;
  max-width: 100%;
  padding: 4px max(24px,calc((100vw - 760px)/2))
}

.pinned-column.is-reading-focused .column-reader {
  padding: 36px 24px 100px
}

.pinned-column.is-reading-focused .column-reader>* {
  max-width: 680px
}

.pinned-column.is-reading-focused .column-article-head :is(.column-status,.column-source),.pinned-column.is-reading-focused .column-article-head>p {
  display: none
}

.pinned-column.is-reading-focused .column-article-head h2 {
  font-size: 30px;
  margin: 0 0 20px
}

.pinned-column.is-reading-focused .column-original>h3 {
  display: none
}

.column-article-head.has-source-title h2 {
  display: none
}

.has-source-title+.column-original .article-body>:first-child {
  margin-top: 0
}

.column-settings-content .source-format-control {
  grid-column: 1/-1;
  display: flex;
  gap: 8px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
  font-size: 12px
}

.column-settings-content .source-format-control small {
  width: 100%;
  font-size: 11px
}

.column-settings-content .source-format-control select {
  min-height: 36px;
  max-width: 100%;
  border-color: var(--color-line-strong);
  padding: 6px 8px
}

.column-resizer {
  position: absolute;
  right: -4px;
  top: 0;
  bottom: 0;
  z-index: 8;
  width: 8px;
  cursor: col-resize;
  touch-action: none
}

.column-resizer::after {
  content: "";
  position: absolute;
  top: 45%;
  left: 2px;
  width: 4px;
  height: 40px;
  border-radius: 4px;
  background: var(--nav-line);
  opacity: 0;
  transition: opacity 160ms
}

.column-resizer:hover::after,.column-resizer:focus-visible::after {
  opacity: 1
}

.column-resizer:focus-visible {
  outline: 2px solid var(--nav-accent);
  outline-offset: -2px
}

@media(min-width:1600px) {
  .column-layout {
    grid-template-columns: var(--column-nav-width,440px) minmax(0,1fr)
  }
  .column-reader {
    padding-top: 56px
  }
  .column-reader>* {
    max-width: 660px
  }
}

@media(max-width:1100px) {
  .topbar {
    padding: 0 22px;
    gap: 18px
  }
  .library-nav {
    gap: 18px
  }
  .topbar-actions {
    gap: 8px
  }
  .brand {
    min-width: 145px
  }
  .column-layout {
    grid-template-columns: var(--column-nav-width,340px) minmax(0,1fr)
  }
  .is-outline .column-layout {
    grid-template-columns: var(--column-nav-width,290px) minmax(0,1fr)
  }
  .column-reader {
    padding: 32px 32px 72px
  }
  .column-heading h1 {
    font-size: 28px
  }
  .column-current-path {
    display: none
  }
  .workspace:not(.pinned-library) {
    grid-template-columns: 190px minmax(0,1fr)
  }
  .context-rail {
    display: none
  }
}

@media(max-width:800px) {
  .field input,.field textarea,.column-search-field input { font-size:16px; }
  .column-breadcrumb :is(button,summary),.column-page-index button,.source-format-control select,.button,.dataset-picker select {
    min-height: 44px
  }
  .column-resizer {
    display: none
  }
  .column-search-field button {
    width: 44px;
    height: 44px
  }
  .column-search-field kbd {
    display: none
  }
  .column-map-bottom button {
    min-width: 44px;
    min-height: 44px
  }
  .column-view-switch button {
    min-height: 44px
  }
  .topbar {
    height: auto;
    min-height: 72px;
    flex-wrap: wrap;
    flex-direction: row;
    align-items: center;
    padding: 14px 18px 0;
    gap: 10px 18px
  }
  .brand {
    margin-right: auto
  }
  .brand-title span {
    display: none
  }
  .topbar-actions {
    margin-left: auto;
    width: auto;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end
  }
  .library-nav {
    order: 3;
    width: 100%;
    gap: 22px;
    margin: 0;
    overflow: auto
  }
  .library-nav a {
    min-height: 44px;
    font-size: 13px
  }
  .library-nav a[aria-current=page]::after {
    bottom: 0
  }
  .topbar .button-quiet {
    padding: 6px;
    min-width: 44px
  }
  .topbar .button-quiet span {
    display: none
  }
  .dataset-picker {
    flex: none
  }
  .dataset-picker select {
    max-width: 150px;
    width: auto
  }
  .column-layout,.is-outline .column-layout {
    grid-template-columns: 1fr;
    overflow: visible
  }
  .column-map {
    height: 440px;
    min-height: 0;
    border-right: 0
  }
  .column-header {
    padding: 22px 22px 16px
  }
  .column-heading {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 4px 12px
  }
  .column-library-label {
    grid-column: 1/-1
  }
  .column-heading h1 {
    font-size: 26px
  }
  .column-search {
    margin-top: 14px
  }
  .column-reading-panel {
    height: 78dvh;
    min-height: 560px
  }
  .column-mobile-tools {
    display: flex;
    justify-content: flex-end;
    padding: 6px 16px;
    background: var(--nav-surface)
  }
  .column-mobile-tools button {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 8px 16px;
    background: var(--nav-accent);
    border: 0;
    border-radius: 6px;
    color: var(--nav-surface);
    font-size: 13px
  }
  .column-reader {
    padding: 32px 24px 64px
  }
  .column-article-head h2 {
    font-size: 29px
  }
  .column-search-results {
    max-height: none
  }
  .pinned-library>.main-column {
    padding: 28px 22px 56px
  }
  .pinned-library.column-workspace>.main-column {
    padding: 0
  }
  .pinned-column.is-reading-focused .column-reader {
    padding: 28px 24px 72px
  }
  .column-path-menu>div {
    left: -76px
  }
  .column-reading-toolbar {
    padding: 8px 20px;
    min-height: 58px
  }
  .column-reading-toolbar :is(button,summary) {
    min-height: 44px
  }
  .column-map-toolbar {
    padding: 8px 20px
  }
  .column-view-switch button,.column-map-menu summary {
    min-height: 44px
  }
  .column-map-menu button,.column-node-toggle {
    min-height: 44px
  }
  .column-settings-content {
    top: 48px
  }
  .column-next-list button {
    gap: 12px
  }
  .column-next-list span {
    display: none
  }
  .workspace:not(.pinned-library) {
    display: block
  }
  .sidebar {
    position: static;
    max-height: none
  }
  .main-column {
    padding: 28px 22px 56px
  }
}

@media(max-width:440px) {
  .topbar {
    padding-inline: 16px
  }
  .brand-title strong {
    font-size: 17px
  }
  .brand {
    min-width: 130px
  }
  .brand-mark {
    width: 30px;
    height: 34px
  }
  .dataset-picker select {
    max-width: 128px;
    font-size: 12px
  }
  .library-nav {
    gap: 18px
  }
  .column-article-head h2 {
    font-size: 27px
  }
  .column-breadcrumb {
    padding-inline: 16px;
    gap: 8px
  }
  .column-back span {
    display: none
  }
  .column-heading>span:last-child {
    font-size: 11px
  }
  .column-reading-toolbar>div {
    gap: 4px
  }
  .column-reader {
    padding-inline: 22px
  }
  .column-reading-panel {
    min-height: 520px
  }
  .pinned-column.is-reading-focused .column-article-head h2 {
    font-size: 27px
  }
  .result-item h3 {
    font-size: 21px
  }
  .pinned-topic-search {
    grid-template-columns: 1fr
  }
  .page-title,.article-head h1 {
    font-size: 28px
  }
}

@media(prefers-reduced-motion:reduce) {
  *,*::before,*::after {
    animation: none!important;
    transition: none!important;
    scroll-behavior: auto!important
  }
}

@media print {
  body,body.is-column-focused {
    overflow: visible;
    background: white
  }
  .topbar,.column-map,.column-reading-toolbar,.column-progress-track,.column-breadcrumb,.column-mobile-tools,.column-page-index {
    display: none!important
  }
  .column-workspace,.column-layout,.column-reading-panel,.column-reader,body.is-column-focused .column-workspace {
    display: block;
    position: static;
    height: auto;
    min-height: 0;
    overflow: visible;
    padding: 0
  }
  .workspace {
    display: block!important
  }
  .column-reader>* {
    max-width: none!important
  }
}