:root {
  --paper: #eef4ec;
  --surface: #e2ece1;
  --ink: #1d3b26;
  --moss: #3f6b4a;
  --accent: #1f8f52;
  --rule: #cfe0d0;
  --warn: #b45309;
  --cursor: var(--accent);
  --font: ui-monospace, "JetBrains Mono", "IBM Plex Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0b0f0d;
    --surface: #10160f;
    --ink: #bfe0c9;
    --moss: #86b894;
    --accent: #4fe08a;
    --rule: #1c2a20;
    --warn: #e0b84f;
  }
}

:root[data-theme="dark"] {
  --paper: #0b0f0d;
  --surface: #10160f;
  --ink: #bfe0c9;
  --moss: #86b894;
  --accent: #4fe08a;
  --rule: #1c2a20;
  --warn: #e0b84f;
}

:root[data-theme="light"] {
  --paper: #eef4ec;
  --surface: #e2ece1;
  --ink: #1d3b26;
  --moss: #3f6b4a;
  --accent: #1f8f52;
  --rule: #cfe0d0;
  --warn: #b45309;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.9rem;
  align-items: center;
  padding: 0.55rem 1.1rem;
  margin-bottom: 0.6rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--surface);
  font-size: 0.78rem;
}

.site-nav a {
  color: var(--moss);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.site-nav .site-nav-brand {
  color: var(--accent);
  margin-right: auto;
  font-weight: 700;
}

header {
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 10px 10px 0 0;
  border-bottom: none;
  background: var(--surface);
  margin-bottom: 0;
}

.titlebar-row {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

.wm-dots {
  display: inline-flex;
  margin-top: 0.4rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #e8635a;
  opacity: 0.55;
  box-shadow: 16px 0 0 0 #e0b84f, 32px 0 0 0 var(--accent);
  margin-right: 1.6rem;
  flex: 0 0 auto;
}

h1,
h2,
h3 {
  color: var(--ink);
  margin-top: 1.5rem;
}

.titlebar-row h1 {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--accent);
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.01em;
  text-wrap: balance;
}

header p {
  margin: 0.35rem 0 0;
  color: var(--moss);
  font-size: 0.85rem;
}

.theme-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font: inherit;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--moss);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.branch-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.35rem;
  margin: 0 0 1rem;
  padding: 0.55rem 0.7rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: none;
  border-radius: 0 0 10px 10px;
}

.branch-nav a {
  flex: 0 0 auto;
  white-space: nowrap;
  color: var(--moss);
  text-decoration: none;
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  font-weight: 600;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.branch-nav a:hover,
.branch-nav a:focus {
  color: var(--accent);
  border-color: var(--rule);
  text-decoration: none;
}

.mind-map-card {
  padding: 1.5rem;
}

.mind-map-layout {
  display: grid;
  grid-template-columns: minmax(0, 2.3fr) minmax(260px, 1fr);
  gap: 1rem;
  align-items: start;
}

.mind-map-root {
  margin-top: 1rem;
}

.mind-map-loading,
.mind-map-error {
  margin: 0;
  color: var(--moss);
  font-size: 0.9rem;
}

.mind-map-error {
  color: var(--warn);
  font-weight: 600;
}

.mind-map-panel {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 1rem;
  min-height: 220px;
}

.mind-map-panel-title {
  margin: 0;
  font-size: 0.95rem;
  color: var(--accent);
}

.mind-map-panel-hint {
  margin: 0.35rem 0 0.9rem;
  color: var(--moss);
  font-size: 0.82rem;
}

.mind-map-panel-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mind-map-panel-node {
  display: block;
  width: 100%;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  font-size: 0.8rem;
  line-height: 1.35;
  opacity: 0;
  transform: translateX(12px);
  animation: panelNodeIn 240ms ease forwards;
  animation-delay: calc(var(--node-index, 0) * 45ms);
}

.mind-map-panel-node:hover,
.mind-map-panel-node:focus {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.mind-map-panel-empty {
  margin: 0;
  color: var(--moss);
  font-size: 0.85rem;
}

@keyframes panelNodeIn {
  from {
    opacity: 0;
    transform: translateX(12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mind-map-panel-node {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

.mind-map-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.mind-map-section-label {
  font: 700 15px/1.2 var(--font);
  fill: var(--moss);
}

.mind-map-connector {
  stroke: var(--rule);
  stroke-width: 2;
  stroke-dasharray: 6 4;
  opacity: 0;
  transition: opacity 180ms ease, stroke 180ms ease;
}

.branch-group.is-open .mind-map-connector,
.branch-group:focus-within .mind-map-connector {
  opacity: 1;
  stroke: var(--accent);
}

.mind-map-topic-node {
  fill: var(--surface);
  stroke: var(--rule);
  stroke-width: 2;
  cursor: pointer;
  transition: fill 160ms ease, stroke 160ms ease;
}

.branch-group.is-open .mind-map-topic-node,
.branch-group:focus-within .mind-map-topic-node {
  fill: var(--paper);
  stroke: var(--accent);
}

.mind-map-topic-text,
.mind-map-subtopic-text {
  font: 600 12px/1.3 var(--font);
  fill: var(--ink);
  pointer-events: none;
}

.mind-map-subtopic-text {
  opacity: 0;
  transition: opacity 180ms ease;
}

.mind-map-subtopic-node {
  fill: var(--surface);
  stroke: var(--rule);
  stroke-width: 1.5;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: fill 160ms ease, stroke 160ms ease, opacity 180ms ease;
}

.branch-group.is-open .mind-map-subtopic-node,
.branch-group:focus-within .mind-map-subtopic-node {
  fill: var(--paper);
  stroke: var(--accent);
  opacity: 1;
  pointer-events: auto;
}

.branch-group.is-open .mind-map-subtopic-text,
.branch-group:focus-within .mind-map-subtopic-text {
  opacity: 1;
}

@media (max-width: 980px) {
  .mind-map-layout {
    grid-template-columns: 1fr;
  }

  .mind-map-panel {
    position: static;
    min-height: 0;
  }
}

.site-footer {
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--surface);
  color: var(--moss);
  padding: 0.9rem 1.1rem;
  margin-top: 1.5rem;
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.footer-meta {
  margin: 0;
  white-space: nowrap;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.site-footer a {
  display: inline-flex;
  align-items: center;
  height: 30px;
  color: var(--moss);
  text-decoration: none;
  padding: 0 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--rule);
  background: var(--paper);
  white-space: nowrap;
  max-width: 100%;
}

.site-footer a:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.footer-logo-link {
  justify-content: center;
  gap: 0.45rem;
}

.footer-link-text {
  font-weight: 600;
  font-size: 0.78rem;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-align: center;
}

.footer-logo {
  display: block;
  height: 16px;
  width: auto;
  max-width: 90px;
  object-fit: contain;
  flex: 0 0 auto;
}

.footer-logo-bmc {
  height: 16px;
  width: 16px;
}

.intro {
  background: var(--surface);
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  margin-bottom: 1.1rem;
  font-size: 0.92rem;
}

.search-panel {
  background: var(--surface);
  padding: 0.9rem 1.1rem;
  border-radius: 10px;
  margin-bottom: 1.1rem;
  border: 1px solid var(--rule);
}

.search-panel-toggle {
  border: 0;
  padding: 0;
  background: none;
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}

.search-panel-toggle::before {
  content: "$ ";
  color: var(--accent);
}

.search-panel-toggle:hover {
  color: var(--accent);
}

.search-chevron {
  display: inline-block;
  margin-left: 0.3rem;
  font-size: 0.85em;
  transform: rotate(0deg);
  transition: transform 180ms ease;
}

.search-panel-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.search-panel-body {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transform: translateY(-6px);
  transition: max-height 220ms ease, opacity 160ms ease, transform 220ms ease;
}

.search-panel:hover .search-panel-body,
.search-panel:focus-within .search-panel-body,
.search-panel.is-open .search-panel-body {
  max-height: 52rem;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  margin-top: 0.65rem;
}

.search-panel:hover .search-chevron,
.search-panel:focus-within .search-chevron,
.search-panel.is-open .search-chevron {
  transform: rotate(180deg);
}

.search-help {
  margin: 0 0 0.75rem;
  color: var(--moss);
  font-size: 0.85rem;
}

.search-label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.85rem;
}

.search-controls {
  display: flex;
  gap: 0.6rem;
  align-items: stretch;
}

.search-input {
  width: 100%;
  flex: 1;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  font-size: 0.9rem;
  background: var(--paper);
  color: var(--ink);
}

.search-input::placeholder {
  color: var(--moss);
  opacity: 0.7;
}

.search-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.search-button {
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0 1rem;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--paper);
  cursor: pointer;
  min-width: 6rem;
}

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

.search-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.search-results {
  margin-top: 1rem;
  display: grid;
  gap: 0.6rem;
}

.search-empty,
.search-status {
  margin: 0;
  color: var(--moss);
  font-size: 0.88rem;
}

.search-result {
  display: block;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--warn);
  border-radius: 6px;
  padding: 0.7rem 0.85rem;
}

.search-result:hover {
  text-decoration: none;
  border-left-color: var(--accent);
}

.search-result-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
  margin-bottom: 0.2rem;
}

.search-result-title {
  font-weight: 700;
  color: var(--ink);
}

.search-result-kind {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--rule);
  color: var(--moss);
}

.search-result-summary {
  margin: 0;
  color: var(--moss);
  font-size: 0.88rem;
}

@media (max-width: 700px) {
  .search-controls {
    flex-direction: column;
  }

  .search-button {
    min-height: 2.75rem;
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .titlebar-row {
    flex-wrap: wrap;
  }

  .titlebar-row h1 {
    order: 3;
    flex-basis: 100%;
  }
}

.section {
  background: var(--surface);
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  margin-bottom: 1rem;
}

.section h2 {
  margin-top: 0;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.35rem;
  font-size: 1.05rem;
  color: var(--accent);
}

.topic {
  margin: 0.9rem 0 0.7rem;
  padding: 0.75rem 0.9rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  color: var(--ink);
}

.topic h3 {
  margin: 0 0 0.3rem;
  font-size: 0.95rem;
  color: inherit;
}

.subtopic {
  margin: 0.55rem 0 0.55rem 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--moss);
  background: var(--paper);
  border-radius: 6px;
  color: var(--ink);
}

.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1rem 1.2rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
  align-items: center;
  font-size: 0.82rem;
  color: var(--moss);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb-separator {
  color: var(--warn);
  font-weight: 700;
}

.subtopic-link {
  margin: 0.75rem 0;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  background: var(--paper);
  border-radius: 8px;
}

.subtopic-link a {
  display: inline-block;
  margin-bottom: 0.3rem;
}

.subtopic-description {
  margin: 0;
  color: var(--moss);
  font-size: 0.9rem;
}

.specific-topic {
  margin: 0.75rem 0;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--moss);
  background: var(--paper);
  border-radius: 8px;
}

.specific-topic h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  color: var(--accent);
}

.specific-topic p {
  margin: 0;
}

.specific-topic h4 {
  margin: 0.55rem 0 0.25rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.specific-topic ul {
  margin: 0 0 0.2rem 1rem;
  padding-left: 0.9rem;
}

.specific-topic .section-label {
  margin: 0.65rem 0 0.25rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--warn);
}

.specific-topic .meta-list {
  margin-top: 0;
}

ul {
  margin: 0.4rem 0 0.4rem 1.1rem;
  padding-left: 1rem;
}

li {
  margin-bottom: 0.25rem;
}

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

a:hover {
  text-decoration: underline;
}

code {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  color: var(--ink);
}

.note {
  color: var(--warn);
  font-weight: 600;
  font-size: 0.9rem;
}