:root {
  --nav-bg: #ffffff;
  --nav-surface: #f7f7f8;
  --nav-hover: #f0f1f3;
  --nav-text: #292b2f;
  --nav-muted: #6c7076;
  --nav-border: #e0e2e5;
  --nav-accent: #991b1b;
  --nav-accent-soft: #fbeaea;
  --nav-link: #1d5fa7;
  --nav-focus: #2563eb;
  --scrollbar-thumb: rgba(41, 43, 47, 0.26);
  --scrollbar-thumb-hover: rgba(41, 43, 47, 0.42);
  --scrollbar-track: transparent;
  --webhelp-font-size: 16px;
  color-scheme: light;
}

:root[data-webhelp-theme="dark"] {
  --nav-bg: #17191c;
  --nav-surface: #1e2125;
  --nav-hover: #272b30;
  --nav-text: #e7e9ec;
  --nav-muted: #a7acb3;
  --nav-border: #34383e;
  --nav-accent: #df6b6b;
  --nav-accent-soft: #3a2022;
  --nav-link: #72a7e4;
  --nav-focus: #72a7ff;
  --scrollbar-thumb: rgba(231, 233, 236, 0.3);
  --scrollbar-thumb-hover: rgba(231, 233, 236, 0.48);
  --scrollbar-track: transparent;
  color-scheme: dark;
}

html,
body,
* {
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

*::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

*::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

*::-webkit-scrollbar-button {
  display: none;
  width: 0;
  height: 0;
}

*::-webkit-scrollbar-thumb {
  min-height: 24px;
  background: var(--scrollbar-thumb);
  border: 1px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

*::-webkit-scrollbar-corner {
  background: transparent;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 0;
  min-height: 100%;
  margin: 0;
}

html {
  background: var(--nav-bg);
}

body {
  color: var(--nav-text);
  background: var(--nav-bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.55;
}

button,
input,
select {
  font: inherit;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--nav-focus);
  outline-offset: 2px;
}

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

button {
  color: inherit;
}

.nav-page {
  min-height: 100vh;
}

.contents-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
}

.contents-tools {
  flex: 0 0 auto;
  padding: 10px 10px 8px;
  border-bottom: 1px solid var(--nav-border);
}

.directory-filter {
  position: relative;
}

.directory-filter svg {
  position: absolute;
  top: 50%;
  right: 10px;
  width: 17px;
  height: 17px;
  color: var(--nav-muted);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  transform: translateY(-50%);
  pointer-events: none;
}

.directory-filter input,
.panel-input {
  width: 100%;
  height: 36px;
  padding: 0 34px 0 10px;
  color: var(--nav-text);
  background: var(--nav-surface);
  border: 1px solid var(--nav-border);
  border-radius: 6px;
}

.directory-filter input::placeholder,
.panel-input::placeholder {
  color: var(--nav-muted);
}

.tree-actions {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-top: 7px;
}

.tree-actions button {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 30px;
  padding: 0;
  color: var(--nav-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  cursor: pointer;
}

.tree-actions button:hover {
  color: var(--nav-text);
  background: var(--nav-hover);
}

.tree-actions svg,
.panel-button svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.filter-count {
  min-width: 0;
  margin-left: auto;
  overflow: hidden;
  color: var(--nav-muted);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.navigation-scroll {
  flex: 1 1 auto;
  min-height: 0;
  padding: 8px 8px 24px;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  -webkit-overflow-scrolling: touch;
}

.navigation-loading {
  padding: 12px 8px;
  color: var(--nav-muted);
  font-size: 12px;
}

.navigation-tree,
.navigation-tree div {
  font-family: inherit;
  font-size: 14px;
}

.navigation-tree > div {
  min-width: 0;
}

.nav-node {
  position: relative;
  min-width: 0;
}

.nav-node[hidden] {
  display: none;
}

.nav-node > a {
  color: var(--nav-text);
  text-decoration: none;
}

.nav-node > a:first-child:not(:last-of-type),
.nav-node > a.nav-disclosure {
  position: absolute;
  top: 2px;
  left: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: var(--nav-muted);
  border: 1px solid transparent;
  border-radius: 7px;
  cursor: pointer;
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease;
}

.nav-node > a:first-child:not(:last-of-type):hover,
.nav-node > a.nav-disclosure:hover {
  color: var(--nav-text);
  background: var(--nav-hover);
  border-color: var(--nav-border);
}

.nav-node > a:first-child:not(:last-of-type) > img,
.nav-node > a.nav-disclosure > img {
  display: none !important;
}

.nav-node > a:first-child:not(:last-of-type)::before,
.nav-node > a.nav-disclosure::before {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  content: "";
  transform: translateX(-1px) rotate(-45deg);
  transition: transform 120ms ease;
}

.nav-node > a:first-child:not(:last-of-type)[aria-expanded="true"]::before,
.nav-node > a.nav-disclosure[aria-expanded="true"]::before {
  transform: translate(-1px, -1px) rotate(45deg);
}

.nav-node > a:last-of-type {
  position: relative;
  display: flex;
  align-items: flex-start;
  width: 100%;
  min-height: 32px;
  padding: 5px 7px 5px 32px;
  border-radius: 5px;
  line-height: 1.5;
}

.nav-node > a:last-of-type::before {
  position: absolute;
  top: 9px;
  left: 10px;
  width: 11px;
  height: 13px;
  border: 1.3px solid var(--nav-muted);
  border-radius: 1px;
  content: "";
}

.nav-node > a:last-of-type::after {
  position: absolute;
  top: 11px;
  left: 17px;
  width: 4px;
  height: 4px;
  background: var(--nav-bg);
  border-bottom: 1.3px solid var(--nav-muted);
  border-left: 1.3px solid var(--nav-muted);
  content: "";
}

/* Parent rows use disclosure arrow as their only leading affordance. */
.nav-node > a:first-child:not(:last-of-type) + a:last-of-type::before,
.nav-node > a:first-child:not(:last-of-type) + a:last-of-type::after {
  display: none;
}

.nav-node > a:last-of-type:hover {
  background: var(--nav-hover);
}

.nav-node > a.is-selected,
.nav-node > a:has(.selected) {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
}

.nav-node > a.is-selected::before,
.nav-node > a:has(.selected)::before {
  border-color: var(--nav-accent);
}

.nav-node > a.is-selected::after,
.nav-node > a:has(.selected)::after {
  border-color: var(--nav-accent);
}

.nav-node > a.is-selected span,
.nav-node > a:has(.selected) span {
  font-weight: 600;
}

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

.nav-node .p {
  display: none;
}

.nav-node span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.selected,
.unselected {
  padding: 0;
  font-weight: inherit;
}

.panel-page {
  min-height: 100vh;
  padding: 12px 12px calc(24px + env(safe-area-inset-bottom));
}

.panel-heading {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.4;
}

.panel-description,
.empty-message {
  color: var(--nav-muted);
  font-size: 12px;
}

.panel-input {
  padding-right: 10px;
}

.index-list,
.bookmark-list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--nav-border);
}

.index-list li,
.bookmark-list li {
  border-bottom: 1px solid var(--nav-border);
}

.bookmark-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px;
  align-items: center;
}

.index-list a,
.bookmark-link {
  display: block;
  width: 100%;
  padding: 9px 8px;
  overflow-wrap: anywhere;
  color: var(--nav-text);
  background: transparent;
  border: 0;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.index-list a:hover,
.bookmark-link:hover,
.index-list a[aria-current="true"],
.bookmark-link[aria-current="true"] {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
}

.bookmark-remove {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  color: var(--nav-muted);
  background: transparent;
  border: 0;
  border-radius: 5px;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.bookmark-remove:hover {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
}

.index-path {
  display: block;
  margin-top: 2px;
  overflow: hidden;
  color: var(--nav-muted);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.panel-actions {
  display: flex;
  gap: 7px;
  margin-top: 10px;
}

.panel-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 34px;
  padding: 0 10px;
  color: var(--nav-text);
  background: var(--nav-surface);
  border: 1px solid var(--nav-border);
  border-radius: 6px;
  cursor: pointer;
}

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

.panel-button-primary {
  color: #ffffff;
  background: #991b1b;
  border-color: #991b1b;
}

.panel-button-primary:hover {
  background: #7f1515;
}

.bookmark-current {
  margin: 12px 0;
  padding: 10px;
  background: var(--nav-surface);
  border-left: 3px solid var(--nav-accent);
  border-radius: 4px;
}

.bookmark-current-label {
  display: block;
  margin-bottom: 3px;
  color: var(--nav-muted);
  font-size: 11px;
}

.bookmark-current-title {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#indexSource {
  display: none;
}

/* Maintained API search page is copied from 5echmweb_search at build time. */
body .search-container,
body .results-wrapper {
  margin: 0;
  padding: 12px;
  color: var(--nav-text);
  background: var(--nav-bg);
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

body .search-title {
  color: var(--nav-text);
  font-size: 16px;
}

body #keyword,
body .filter-select {
  color: var(--nav-text);
  background: var(--nav-surface);
  border-color: var(--nav-border);
  border-radius: 6px;
}

body #keyword:focus,
body .filter-select:focus {
  background: var(--nav-bg);
  border-color: var(--nav-focus);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--nav-focus) 18%, transparent);
}

body .options-row,
body .filter-label,
body .checkbox-label {
  color: var(--nav-muted);
}

body .filter-item {
  min-width: 0;
  flex: 1 1 150px;
}

body .filter-select {
  min-width: 0;
  max-width: 100%;
}

body .checkbox-label input {
  accent-color: var(--nav-accent);
}

body .btn {
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 6px;
}

body .btn-primary {
  color: #ffffff;
  background: #991b1b;
}

body .btn-primary:hover {
  background: #7f1515;
}

body .btn-secondary {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
}

body .btn-ghost {
  color: var(--nav-link);
}

body .results-wrapper {
  padding-top: 4px;
}

body .results-info {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
  border-radius: 5px;
}

body .results-list-container {
  border-color: var(--nav-border);
  border-radius: 6px;
}

body .results-header {
  color: var(--nav-muted);
  background: var(--nav-surface);
}

body .results-list {
  max-height: none;
}

body .result-item {
  color: var(--nav-text);
  border-color: var(--nav-border);
}

body .result-item:hover {
  background: var(--nav-hover);
}

body .result-item.selected {
  background: var(--nav-accent-soft);
  border-left-color: var(--nav-accent);
}

body .result-title-text {
  color: var(--nav-text);
}

body .result-rank {
  color: var(--nav-accent);
  background: var(--nav-accent-soft);
}

body .result-meta,
body .empty-state {
  color: var(--nav-muted);
}

body .result-snippet {
  grid-column: 1 / -1;
  margin: 5px 0 0;
  color: var(--nav-muted);
  font-size: 12px;
  line-height: 1.55;
}

body .result-title-text mark,
body .result-snippet mark {
  padding: 0 1px;
  color: inherit;
  background: #fde68a;
}

body .search-help-bubble {
  color: var(--nav-text);
  background: var(--nav-surface);
  border-color: var(--nav-border);
  border-radius: 6px;
}

body .search-help-bubble strong {
  color: var(--nav-accent);
}

@media (max-width: 600px) {
  body .results-header,
  body .preview-tooltip {
    display: none;
  }

  body .result-item {
    display: block;
    padding: 10px 11px;
  }

  body .result-meta {
    margin-top: 5px;
    overflow-wrap: anywhere;
  }

  body .btn-group {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  body .btn-ghost {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}