:root {
  color-scheme: light;
  --cream: #f4f1ea;
  --cream-deep: #e9e4d9;
  --paper: #faf8f3;
  --charcoal: #1d1d1b;
  --muted: #6c6962;
  --quiet: #9d988e;
  --red: #e63329;
  --line: rgba(29, 29, 27, 0.18);
  --line-strong: rgba(29, 29, 27, 0.44);
  --hairline: 1px;
  --topbar-height: 64px;
  --control-width: 330px;
  --inspector-width: 430px;
  font-family: Inter, Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--cream);
  color: var(--charcoal);
}

button,
input,
select {
  font: inherit;
}

button,
a,
input,
select {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
canvas:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: -2px;
}

[hidden] {
  display: none !important;
}

.app {
  width: 100%;
  height: 100%;
}

.topbar {
  position: relative;
  z-index: 20;
  display: grid;
  grid-template-columns: var(--control-width) minmax(0, 1fr) auto;
  align-items: stretch;
  height: var(--topbar-height);
  border-bottom: var(--hairline) solid var(--charcoal);
  background: var(--cream);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  border-right: var(--hairline) solid var(--charcoal);
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 64px;
  height: 100%;
  flex: 0 0 auto;
  border-right: var(--hairline) solid var(--charcoal);
  background: var(--red);
  color: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
  font-style: italic;
  line-height: 1;
}

.brand-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
  padding: 0 16px;
}

.brand-copy strong {
  overflow: hidden;
  font-size: 11px;
  letter-spacing: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy small {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0;
}

.topbar-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.topbar-metrics span {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 0 18px;
  border-right: var(--hairline) solid var(--line);
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0;
}

.topbar-metrics span:last-child {
  border-right: 0;
}

.topbar-metrics b {
  color: var(--charcoal);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.topbar-actions {
  display: flex;
  border-left: var(--hairline) solid var(--charcoal);
}

.topbar-actions button,
.canvas-toolbar button,
.inspector-head button,
.dialog-head button {
  border: 0;
  border-left: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}

.topbar-actions button:first-child {
  border-left: 0;
}

.text-button {
  min-width: 88px;
  padding: 0 16px;
  font-size: 11px;
  font-weight: 700;
}

.release-button {
  display: inline-flex;
  min-width: 150px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: 0;
}

.release-button i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #23816c;
}

.icon-button {
  width: 64px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 17px;
}

.topbar-actions button:hover,
.canvas-toolbar button:hover,
.inspector-head button:hover,
.dialog-head button:hover {
  background: var(--charcoal);
  color: var(--paper);
}

.workspace {
  display: grid;
  grid-template-columns: var(--control-width) minmax(0, 1fr);
  height: calc(100% - var(--topbar-height));
  min-height: 0;
}

.app.inspector-open .workspace {
  grid-template-columns: var(--control-width) minmax(0, 1fr) var(--inspector-width);
}

.control-panel,
.inspector {
  min-height: 0;
  background: var(--cream);
}

.control-panel {
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  overflow-y: auto;
  border-right: var(--hairline) solid var(--charcoal);
  scrollbar-color: var(--charcoal) transparent;
  scrollbar-width: thin;
}

.intro-block {
  padding: 28px 22px 24px;
  border-bottom: var(--hairline) solid var(--line-strong);
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.5;
}

.intro-block h1 {
  margin: 0;
  font-size: 30px;
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.15;
  word-break: keep-all;
}

.intro-block > p:last-child {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.75;
  word-break: keep-all;
}

.mode-switcher {
  display: grid;
  border-bottom: var(--hairline) solid var(--line-strong);
}

.mode-switcher button {
  display: grid;
  grid-template-columns: 30px 1fr;
  min-height: 42px;
  align-items: center;
  padding: 0 20px;
  border: 0;
  border-bottom: var(--hairline) solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 10px;
  font-weight: 700;
}

.mode-switcher button:last-child {
  border-bottom: 0;
}

.mode-switcher button span {
  color: var(--quiet);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.mode-switcher button:hover,
.mode-switcher button[aria-pressed="true"] {
  background: var(--charcoal);
  color: var(--paper);
}

.mode-switcher button[aria-pressed="true"] span {
  color: var(--red);
}

.profile-block {
  padding: 18px 20px;
  border-bottom: var(--hairline) solid var(--line-strong);
}

.saved-indicator {
  color: var(--muted);
  font-size: 7px;
}

.saved-indicator[data-active="true"] {
  color: #176d5b;
  font-weight: 750;
}

.profile-field,
.profile-subject-field {
  display: grid;
  gap: 7px;
  margin: 13px 0 0;
  padding: 0;
  border: 0;
}

.profile-field > span,
.profile-subject-field legend {
  font-size: 9px;
  font-weight: 700;
}

.profile-field small,
.profile-subject-field small {
  color: var(--quiet);
  font-size: 7px;
  font-weight: 500;
}

.profile-field input,
.profile-field select {
  width: 100%;
  min-height: 36px;
  padding: 0 10px;
  border: var(--hairline) solid var(--line-strong);
  border-radius: 0;
  background: var(--paper);
  color: var(--charcoal);
  font-size: 10px;
}

.profile-subjects {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 5px;
}

.profile-subject-option {
  position: relative;
  display: flex;
  min-height: 30px;
  align-items: center;
  gap: 7px;
  padding: 6px 7px;
  border: var(--hairline) solid var(--line);
  background: var(--paper);
  cursor: pointer;
  font-size: 8px;
}

.profile-subject-option:has(input:checked) {
  border-color: var(--charcoal);
  font-weight: 750;
}

.profile-subject-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.profile-subject-option:has(input:focus-visible) {
  outline: 2px solid var(--red);
  outline-offset: -2px;
}

.profile-subject-option i {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--subject-color, var(--charcoal));
  opacity: 0.35;
}

.profile-subject-option input:checked + i {
  opacity: 1;
}

.privacy-note {
  display: grid;
  gap: 8px;
  padding: 16px 20px;
  border-top: var(--hairline) solid var(--line-strong);
  background: var(--cream-deep);
}

.privacy-note strong {
  font-size: 9px;
}

.privacy-note p {
  margin: 0;
  color: var(--muted);
  font-size: 8px;
  line-height: 1.65;
  word-break: keep-all;
}

.privacy-note code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.95em;
}

.privacy-note button {
  min-height: 32px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  font-size: 8px;
  font-weight: 750;
}

.privacy-note button:not(:disabled):hover {
  background: var(--red);
  border-color: var(--red);
  color: var(--paper);
}

.search-block,
.filter-block {
  padding: 18px 20px;
  border-bottom: var(--hairline) solid var(--line-strong);
}

.search-block label,
.section-heading h2 {
  display: block;
  margin: 0 0 10px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.search-field {
  display: grid;
  grid-template-columns: 1fr 34px;
  height: 39px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--paper);
}

.search-field:focus-within {
  border-color: var(--red);
}

.search-field input {
  min-width: 0;
  padding: 0 11px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--charcoal);
  font-size: 11px;
}

.search-field input::placeholder {
  color: var(--quiet);
}

.search-field button {
  border: 0;
  border-left: var(--hairline) solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 18px;
}

.search-field button:hover {
  background: var(--red);
  color: var(--paper);
}

.search-results {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.search-results:not(:empty) {
  margin-top: 8px;
  border: var(--hairline) solid var(--charcoal);
}

.search-results button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 8px;
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-bottom: var(--hairline) solid var(--line);
  background: var(--paper);
  text-align: left;
  cursor: pointer;
}

.search-results li:last-child button {
  border-bottom: 0;
}

.search-results button:hover,
.search-results button[aria-current="true"] {
  background: var(--charcoal);
  color: var(--paper);
}

.search-results strong {
  overflow: hidden;
  font-size: 10px;
  line-height: 1.45;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.search-results span {
  grid-row: span 2;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.search-results button:hover span,
.search-results button[aria-current="true"] span {
  color: var(--cream-deep);
}

.search-results small {
  color: var(--muted);
  font-size: 8px;
}

.search-results button:hover small,
.search-results button[aria-current="true"] small {
  color: var(--cream-deep);
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.section-heading h2 {
  margin: 0;
}

.mini-button {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 9px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.subject-filters,
.grade-filters {
  display: grid;
  gap: 4px;
}

.grade-filters {
  grid-template-columns: repeat(3, 1fr);
}

.filter-chip {
  display: grid;
  grid-template-columns: 11px minmax(0, 1fr) auto;
  align-items: center;
  gap: 7px;
  min-height: 29px;
  padding: 5px 7px;
  border: var(--hairline) solid transparent;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.filter-chip:hover {
  border-color: var(--line-strong);
  background: var(--paper);
}

.filter-chip[aria-pressed="false"] {
  color: var(--quiet);
}

.filter-chip-dot {
  width: 7px;
  height: 7px;
  border: var(--hairline) solid var(--chip-color, var(--charcoal));
  background: var(--chip-color, var(--charcoal));
}

.filter-chip[aria-pressed="false"] .filter-chip-dot {
  background: transparent;
}

.filter-chip-name {
  overflow: hidden;
  font-size: 10px;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.filter-chip-count {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.grade-filters .filter-chip {
  display: flex;
  min-height: 35px;
  justify-content: center;
  padding: 5px;
  border-color: var(--line-strong);
  text-align: center;
}

.grade-filters .filter-chip[aria-pressed="true"] {
  background: var(--charcoal);
  color: var(--paper);
}

.grade-filters .filter-chip-dot,
.grade-filters .filter-chip-count {
  display: none;
}

.path-legend {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 16px 20px;
  color: var(--muted);
  font-size: 8px;
}

.path-legend > strong {
  color: var(--charcoal);
  font-size: 9px;
}

.path-legend span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.legend-line {
  display: inline-block;
  width: 22px;
  height: 2px;
  background: var(--charcoal);
}

.legend-line.unlock {
  background: var(--red);
}

.legend-line.indirect {
  height: 0;
  border-top: 2px dashed var(--charcoal);
  background: transparent;
}

.legend-badge,
.relation-badge {
  display: inline-grid;
  min-width: 27px;
  min-height: 17px;
  place-items: center;
  border: var(--hairline) solid var(--charcoal);
  color: var(--charcoal);
  font-style: normal;
  font-size: 7px;
  font-weight: 800;
}

.legend-badge.recommended,
.relation-badge.recommended {
  border-style: dashed;
  color: var(--muted);
}

.data-note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding: 14px 20px;
  border-top: var(--hairline) solid var(--line-strong);
  color: var(--muted);
  font-size: 8px;
  letter-spacing: 0;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--quiet);
}

.app[data-state="ready"] .status-dot {
  background: #23816c;
}

.app[data-state="error"] .status-dot {
  background: var(--red);
}

.graph-panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: #060912;
}

#graph-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #060912;
  cursor: grab;
  touch-action: none;
}

#graph-canvas.is-dragging {
  cursor: grabbing;
}

.canvas-toolbar {
  position: absolute;
  top: 16px;
  right: 16px;
  display: grid;
  grid-template-columns: 54px 36px 58px 36px;
  height: 36px;
  border: var(--hairline) solid rgba(244, 241, 234, 0.58);
  background: #090d18;
  color: var(--paper);
}

.canvas-toolbar button {
  border-left: 0;
  border-right: var(--hairline) solid rgba(244, 241, 234, 0.42);
  font-size: 17px;
}

.canvas-toolbar .view-toggle {
  font-size: 8px;
  font-weight: 750;
}

.canvas-toolbar button:last-child {
  border-right: 0;
  border-left: var(--hairline) solid rgba(244, 241, 234, 0.42);
}

.canvas-toolbar output {
  display: grid;
  place-items: center;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.visible-count {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 10px;
  border: var(--hairline) solid rgba(244, 241, 234, 0.58);
  background: #090d18;
  color: var(--paper);
}

.visible-count strong {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
}

.visible-count span {
  color: rgba(244, 241, 234, 0.72);
  font-size: 8px;
}

.loading-panel,
.empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  align-items: stretch;
  min-width: min(390px, calc(100% - 40px));
  border: var(--hairline) solid var(--charcoal);
  background: var(--cream);
  transform: translate(-50%, -50%);
}

.loading-index {
  display: grid;
  place-items: center;
  width: 66px;
  flex: 0 0 auto;
  border-right: var(--hairline) solid var(--charcoal);
  background: var(--red);
  color: var(--paper);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
}

.loading-panel > div {
  display: grid;
  gap: 7px;
  padding: 18px;
}

.loading-panel button {
  min-height: 32px;
  margin-top: 4px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: var(--charcoal);
  color: var(--paper);
  cursor: pointer;
  font-size: 9px;
  font-weight: 750;
}

.loading-panel strong,
.empty-state b {
  font-size: 12px;
}

.loading-panel div span,
.empty-state span {
  color: var(--muted);
  font-size: 9px;
}

.app[data-state="ready"] .loading-panel {
  display: none;
}

.app[data-state="error"] .loading-index {
  background: var(--charcoal);
}

.empty-state {
  display: grid;
  gap: 8px;
  padding: 20px;
  text-align: center;
}

.hover-card {
  position: absolute;
  z-index: 8;
  display: grid;
  gap: 4px;
  width: min(248px, calc(100% - 24px));
  padding: 9px 10px;
  border: var(--hairline) solid rgba(244, 241, 234, 0.64);
  background: #090d18;
  color: var(--paper);
  pointer-events: none;
}

.hover-card span {
  color: rgba(244, 241, 234, 0.72);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.hover-card strong {
  font-size: 10px;
  line-height: 1.4;
}

.canvas-hint {
  position: absolute;
  right: 16px;
  bottom: 13px;
  margin: 0;
  color: rgba(244, 241, 234, 0.54);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  letter-spacing: 0;
  pointer-events: none;
}

.topic-list-panel {
  position: absolute;
  inset: 0;
  z-index: 12;
  padding: 24px;
  overflow-y: auto;
  background: var(--cream);
  scrollbar-color: var(--charcoal) transparent;
  scrollbar-width: thin;
}

.topic-list-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 18px;
  border-bottom: var(--hairline) solid var(--charcoal);
}

.topic-list-head span {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: 0;
}

.topic-list-head h2 {
  margin: 8px 0 0;
  font-size: 30px;
  letter-spacing: 0;
}

.topic-list-head button {
  min-height: 38px;
  padding: 0 14px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  font-size: 9px;
  font-weight: 750;
}

.topic-list-panel > p {
  margin: 14px 0 18px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hairline) solid var(--line-strong);
  border-left: var(--hairline) solid var(--line-strong);
}

.topic-list button {
  display: grid;
  min-height: 86px;
  align-content: center;
  gap: 5px;
  padding: 12px;
  border: 0;
  border-right: var(--hairline) solid var(--line-strong);
  border-bottom: var(--hairline) solid var(--line-strong);
  background: var(--paper);
  text-align: left;
  cursor: pointer;
}

.topic-list button:hover,
.topic-list button[aria-current="true"] {
  background: var(--charcoal);
  color: var(--paper);
}

.topic-list-code {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
}

.topic-list strong {
  font-size: 10px;
  line-height: 1.45;
}

.topic-list small {
  color: var(--muted);
  font-size: 8px;
}

.topic-list button:hover small,
.topic-list button[aria-current="true"] small {
  color: var(--cream-deep);
}

.parent-panel {
  min-width: 0;
  min-height: 0;
  padding: 34px;
  overflow-y: auto;
  background: var(--cream);
  scrollbar-color: var(--charcoal) transparent;
  scrollbar-width: thin;
}

.parent-panel-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding-bottom: 24px;
  border-bottom: var(--hairline) solid var(--charcoal);
}

.parent-panel-head .eyebrow {
  margin-bottom: 12px;
}

.parent-panel-head h2 {
  margin: 0;
  font-size: 42px;
  letter-spacing: 0;
  line-height: 1.08;
}

.parent-panel-head > div > p:last-child {
  max-width: 680px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
  word-break: keep-all;
}

.parent-summary {
  display: grid;
  grid-template-columns: repeat(4, 58px);
  border-top: var(--hairline) solid var(--charcoal);
  border-left: var(--hairline) solid var(--charcoal);
}

.parent-summary span {
  display: grid;
  min-height: 54px;
  place-items: center;
  gap: 2px;
  border-right: var(--hairline) solid var(--charcoal);
  border-bottom: var(--hairline) solid var(--charcoal);
  color: var(--muted);
  font-size: 7px;
}

.parent-summary b {
  color: var(--charcoal);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
}

.parent-empty {
  display: grid;
  max-width: 560px;
  justify-items: start;
  gap: 10px;
  margin: 52px auto;
  padding: 26px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--paper);
}

.parent-empty strong {
  font-size: 18px;
}

.parent-empty p {
  margin: 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}

.parent-empty button {
  min-height: 40px;
  padding: 0 16px;
  border: 0;
  border-radius: 0;
  background: var(--charcoal);
  color: var(--paper);
  cursor: pointer;
  font-size: 9px;
  font-weight: 750;
}

.parent-topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 14px;
  padding-top: 22px;
}

.parent-topic-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 18px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--paper);
}

.parent-topic-card-head,
.parent-topic-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-index {
  color: var(--quiet);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.topic-state {
  padding: 4px 6px;
  border: var(--hairline) solid var(--line-strong);
  font-size: 8px;
  font-weight: 750;
}

.state-practicing,
.state-preview {
  border-color: var(--red);
  color: var(--red);
}

.state-familiar {
  background: var(--charcoal);
  color: var(--paper);
}

.parent-topic-meta {
  margin: 15px 0 7px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  line-height: 1.5;
}

.parent-topic-title {
  margin: 0 0 15px;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 17px;
  font-weight: 780;
  letter-spacing: 0;
  line-height: 1.35;
}

.parent-topic-title:hover {
  color: var(--red);
}

.parent-card-info {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 9px;
  padding: 10px 0;
  border-top: var(--hairline) solid var(--line);
}

.parent-card-info span {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  font-weight: 750;
}

.parent-card-info p {
  margin: 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.65;
  word-break: keep-all;
}

.parent-topic-actions {
  margin-top: auto;
  padding-top: 14px;
}

.parent-topic-actions button {
  min-height: 34px;
  padding: 0 10px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  font-size: 8px;
  font-weight: 750;
}

.parent-topic-actions .card-detail {
  background: var(--charcoal);
  color: var(--paper);
}

.inspector {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-left: var(--hairline) solid var(--charcoal);
}

.inspector[aria-hidden="true"] {
  display: none;
}

.inspector-head {
  display: flex;
  min-height: 49px;
  align-items: stretch;
  justify-content: space-between;
  border-bottom: var(--hairline) solid var(--charcoal);
}

.inspector-head span {
  display: flex;
  align-items: center;
  padding: 0 18px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  letter-spacing: 0;
}

.inspector-head button {
  width: 49px;
  font-size: 20px;
}

.inspector-body {
  min-height: 0;
  padding: 24px 22px 36px;
  overflow-y: auto;
  scrollbar-color: var(--charcoal) transparent;
  scrollbar-width: thin;
}

.selected-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin-bottom: 18px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.subject-chip {
  padding: 4px 6px;
  border: var(--hairline) solid currentColor;
  color: var(--chip-color, var(--charcoal));
  font-family: Inter, Pretendard, "Noto Sans KR", sans-serif;
  font-weight: 750;
}

.inspector-body h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 760;
  letter-spacing: 0;
  line-height: 1.25;
  word-break: keep-all;
}

.selected-description {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.8;
  word-break: keep-all;
}

.ontology-identity {
  display: grid;
  gap: 8px;
  margin-top: 16px;
  padding: 12px;
  border: var(--hairline) solid var(--line-strong);
  background: var(--paper);
}

.ontology-identity > div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 8px;
  font-size: 8px;
  line-height: 1.45;
}

.ontology-identity span {
  color: var(--muted);
}

.ontology-identity code {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 7px;
  line-height: 1.5;
}

.topic-actions {
  display: grid;
  gap: 9px;
  margin-top: 22px;
  padding: 15px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--cream-deep);
}

.favorite-button,
.status-clear {
  min-height: 28px;
  padding: 0 8px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  font-size: 8px;
  font-weight: 750;
}

.favorite-button[aria-pressed="true"] {
  background: var(--charcoal);
  color: var(--paper);
}

.status-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: var(--hairline) solid var(--charcoal);
  border-left: var(--hairline) solid var(--charcoal);
}

.status-options button {
  min-height: 34px;
  padding: 5px;
  border: 0;
  border-right: var(--hairline) solid var(--charcoal);
  border-bottom: var(--hairline) solid var(--charcoal);
  background: var(--paper);
  cursor: pointer;
  font-size: 8px;
  line-height: 1.3;
}

.status-options button[aria-pressed="true"] {
  background: var(--red);
  color: var(--paper);
  font-weight: 750;
}

.status-clear {
  justify-self: start;
  border-color: var(--line-strong);
}

.home-card {
  margin-top: 18px;
  padding: 16px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--paper);
}

.home-card span {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0;
}

.home-card p {
  margin: 10px 0 0;
  font-size: 11px;
  font-weight: 620;
  line-height: 1.7;
  word-break: keep-all;
}

.detail-section,
.question-card,
.cluster-card {
  margin-top: 24px;
  padding-top: 18px;
  border-top: var(--hairline) solid var(--line-strong);
}

.detail-section h3,
.path-heading h3 {
  margin: 0 0 12px;
  font-size: 10px;
}

.detail-section ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-section li {
  position: relative;
  padding-left: 14px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}

.detail-section li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 1px;
  background: var(--red);
  content: "";
}

.question-card {
  padding: 18px;
  border: var(--hairline) solid var(--charcoal);
  background: var(--paper);
}

.question-card span,
.cluster-card > span {
  color: var(--red);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0;
}

.question-card p {
  margin: 11px 0 0;
  font-size: 12px;
  font-weight: 650;
  line-height: 1.65;
  word-break: keep-all;
}

.path-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.path-heading h3 {
  margin: 0;
}

.path-heading b {
  display: grid;
  place-items: center;
  min-width: 23px;
  height: 18px;
  padding: 0 5px;
  background: var(--charcoal);
  color: var(--paper);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.sequence-card > span {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0;
}

.sequence-card h3 {
  margin-top: 7px;
  font-size: 15px;
}

.sequence-card > p {
  margin: 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.7;
  word-break: keep-all;
}

.path-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 12px;
  border-top: var(--hairline) solid var(--charcoal);
  border-left: var(--hairline) solid var(--charcoal);
}

.path-summary span {
  display: flex;
  min-height: 32px;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border-right: var(--hairline) solid var(--charcoal);
  border-bottom: var(--hairline) solid var(--charcoal);
  color: var(--muted);
  font-size: 7px;
}

.path-summary b {
  color: var(--charcoal);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
}

.path-examples {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.path-examples article {
  display: grid;
  gap: 5px;
  padding: 10px 0 0;
  border-top: var(--hairline) solid var(--line-strong);
}

.path-examples strong {
  color: var(--charcoal);
  font-size: 8px;
}

.path-examples p {
  margin: 0;
  color: var(--muted);
  font-size: 8px;
  line-height: 1.65;
  word-break: keep-all;
}

.path-examples code {
  color: var(--red);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
  overflow-wrap: anywhere;
}

.unlock-list + * {
  color: var(--red);
}

.related-list {
  display: grid;
  border-top: var(--hairline) solid var(--line);
}

.related-list button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 8px;
  padding: 10px 0;
  border: 0;
  border-bottom: var(--hairline) solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.related-list button:hover strong {
  color: var(--red);
}

.related-list strong {
  font-size: 9px;
  line-height: 1.45;
}

.related-list .relation-badge {
  grid-column: 2;
  grid-row: 1;
  align-self: start;
}

.related-list small {
  color: var(--muted);
  font-size: 8px;
}

.related-list .related-meta {
  grid-column: 1;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
}

.related-list .related-reason {
  grid-column: 1 / -1;
  margin-top: 3px;
  color: var(--muted);
  line-height: 1.55;
  word-break: keep-all;
}

.related-empty {
  padding: 10px 0;
  color: var(--quiet);
  font-size: 9px;
}

.cluster-card {
  display: grid;
  gap: 8px;
  padding: 18px;
  border: var(--hairline) solid var(--charcoal);
}

.cluster-card strong {
  font-size: 12px;
  line-height: 1.45;
}

.cluster-card p {
  margin: 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.7;
}

.guide-dialog {
  width: min(520px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0 28px 28px;
  overflow-y: auto;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: var(--cream);
  color: var(--charcoal);
}

.guide-dialog::backdrop {
  background: rgba(29, 29, 27, 0.78);
}

.dialog-head {
  display: flex;
  height: 52px;
  align-items: center;
  justify-content: space-between;
  margin: 0 -28px 28px;
  border-bottom: var(--hairline) solid var(--charcoal);
}

.dialog-head span {
  padding-left: 20px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  letter-spacing: 0;
}

.dialog-head button {
  width: 52px;
  height: 100%;
  font-size: 20px;
}

.guide-dialog h2 {
  margin: 0;
  font-size: 34px;
  letter-spacing: 0;
  line-height: 1.14;
}

.guide-dialog > p {
  margin: 20px 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.8;
  word-break: keep-all;
}

.guide-dialog ol {
  display: grid;
  margin: 0 0 22px;
  padding: 0;
  border-top: var(--hairline) solid var(--charcoal);
  list-style: none;
  counter-reset: guide;
}

.guide-dialog li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: var(--hairline) solid var(--line-strong);
  counter-increment: guide;
}

.guide-dialog li b {
  color: var(--red);
  font-size: 10px;
}

.guide-dialog li span {
  color: var(--muted);
  font-size: 10px;
}

.ontology-dialog {
  width: min(680px, calc(100vw - 32px));
}

.ontology-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 0;
  border-top: var(--hairline) solid var(--charcoal);
  border-left: var(--hairline) solid var(--charcoal);
}

.ontology-facts div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 10px;
  min-height: 46px;
  align-items: center;
  padding: 8px 10px;
  border-right: var(--hairline) solid var(--charcoal);
  border-bottom: var(--hairline) solid var(--charcoal);
}

.ontology-facts dt {
  color: var(--muted);
  font-size: 8px;
}

.ontology-facts dd {
  margin: 0;
  font-size: 9px;
  font-weight: 750;
}

.ontology-limits {
  margin-top: 16px;
  padding: 14px;
  border: var(--hairline) solid var(--red);
}

.ontology-limits strong {
  color: var(--red);
  font-size: 9px;
}

.ontology-limits p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.7;
}

.ontology-downloads {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.ontology-downloads a {
  display: grid;
  gap: 6px;
  min-height: 62px;
  align-content: center;
  padding: 12px;
  border: var(--hairline) solid var(--charcoal);
  color: inherit;
  text-decoration: none;
}

.ontology-downloads a:hover {
  background: var(--charcoal);
  color: var(--paper);
}

.ontology-downloads strong {
  font-size: 10px;
}

.ontology-downloads span {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
}

.dialog-confirm {
  width: 100%;
  min-height: 44px;
  border: var(--hairline) solid var(--charcoal);
  border-radius: 0;
  background: var(--charcoal);
  color: var(--paper);
  cursor: pointer;
  font-size: 11px;
  font-weight: 750;
}

.dialog-confirm:hover {
  background: var(--red);
  border-color: var(--red);
}

noscript {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 30px;
  background: var(--cream);
  text-align: center;
}

@media (max-width: 1160px) {
  :root {
    --control-width: 264px;
    --inspector-width: 344px;
  }

  .intro-block {
    padding: 22px 18px;
  }

  .search-block,
  .filter-block,
  .profile-block,
  .privacy-note {
    padding-right: 16px;
    padding-left: 16px;
  }
}

@media (max-width: 960px) {
  .app.inspector-open .workspace {
    grid-template-columns: var(--control-width) minmax(0, 1fr);
  }

  .inspector {
    position: fixed;
    z-index: 30;
    top: var(--topbar-height);
    right: 0;
    bottom: 0;
    width: min(var(--inspector-width), calc(100vw - 40px));
    border-top: 0;
    background: var(--cream);
  }
}

@media (max-width: 720px) {
  :root {
    --topbar-height: 54px;
  }

  .topbar {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .brand {
    border-right: 0;
  }

  .brand-mark {
    width: 54px;
    font-size: 28px;
  }

  .brand-copy {
    padding: 0 12px;
  }

  .brand-copy small,
  .topbar-metrics,
  .text-button {
    display: none;
  }

  .topbar-actions {
    grid-column: 2;
  }

  .icon-button {
    width: 54px;
  }

  .release-button {
    min-width: 54px;
    width: 54px;
    padding: 0;
  }

  .release-button span {
    width: 0;
    overflow: hidden;
  }

  .workspace,
  .app.inspector-open .workspace {
    display: flex;
    flex-direction: column;
  }

  .graph-panel,
  .parent-panel {
    order: 1;
    min-height: 52dvh;
    flex: 1 1 58%;
    border-bottom: var(--hairline) solid var(--charcoal);
  }

  .parent-panel {
    padding: 20px 16px;
  }

  .control-panel {
    order: 2;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    flex: 1 1 42%;
    border-right: 0;
    overflow: auto;
  }

  .intro-block,
  .path-legend {
    display: none;
  }

  .ontology-facts,
  .ontology-downloads {
    grid-template-columns: 1fr;
  }

  .mode-switcher,
  .profile-block,
  .privacy-note {
    grid-column: 1 / -1;
  }

  .mode-switcher {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .mode-switcher button {
    grid-template-columns: 1fr;
    min-height: 46px;
    justify-items: center;
    padding: 6px;
    border-right: var(--hairline) solid var(--line);
    border-bottom: 0;
    text-align: center;
    font-size: 8px;
  }

  .profile-block {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 12px;
  }

  .profile-block > .section-heading,
  .profile-subject-field {
    grid-column: 1 / -1;
  }

  .search-block {
    grid-column: 1 / -1;
    padding: 12px 14px;
  }

  .filter-block {
    padding: 12px 14px;
    border-right: var(--hairline) solid var(--line-strong);
  }

  .grade-filter-block {
    border-right: 0;
  }

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

  .filter-chip {
    min-height: 26px;
  }

  .filter-chip-count {
    display: none;
  }

  .grade-filters {
    grid-template-columns: 1fr;
  }

  .data-note {
    display: none;
  }

  .canvas-toolbar {
    top: 10px;
    right: 10px;
  }

  .visible-count {
    top: 10px;
    left: 10px;
  }

  .canvas-hint {
    display: none;
  }

  .topic-list-panel {
    padding: 16px 12px;
  }

  .topic-list {
    grid-template-columns: 1fr;
  }

  .parent-panel-head {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .parent-summary {
    grid-template-columns: repeat(4, 1fr);
  }

  .parent-topic-grid {
    grid-template-columns: 1fr;
  }

  .inspector {
    top: var(--topbar-height);
    left: 0;
    width: 100%;
    border-left: 0;
  }

  .inspector-body {
    padding-right: 18px;
    padding-left: 18px;
  }
}

@media (max-width: 480px) {
  .control-panel {
    grid-template-columns: 1fr;
  }

  .filter-block {
    border-right: 0;
  }

  .profile-block {
    grid-template-columns: 1fr;
  }

  .profile-block > .section-heading,
  .profile-subject-field {
    grid-column: auto;
  }

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

  .loading-panel {
    min-width: calc(100% - 24px);
  }

  .loading-index {
    width: 50px;
  }

  .topic-list-head {
    display: grid;
  }

  .topic-list-head button {
    justify-self: start;
  }

  .parent-panel-head h2 {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .filter-chip-dot,
  .legend-line,
  .status-dot {
    forced-color-adjust: none;
  }
}

/* Readability correction for the learning-map controls and inspector. */
.brand-copy strong,
.topbar-metrics span,
.release-button,
.text-button,
.mode-switcher button,
.profile-field > span,
.profile-subject-field legend,
.search-block label,
.section-heading h2,
.mini-button,
.filter-chip-name,
.path-legend,
.privacy-note button,
.loading-panel button,
.canvas-toolbar .view-toggle,
.topic-list-head button,
.parent-empty button,
.parent-topic-actions button,
.favorite-button,
.status-clear,
.status-options button,
.dialog-confirm {
  font-size: 12px;
}

.intro-block > p:last-child,
.privacy-note p,
.loading-panel div span,
.empty-state span,
.topic-list-panel > p,
.parent-panel-head > div > p:last-child,
.parent-empty p,
.parent-card-info p,
.selected-description,
.home-card p,
.detail-section li,
.sequence-card > p,
.path-examples p,
.related-list .related-reason,
.related-empty,
.cluster-card p,
.guide-dialog > p,
.ontology-limits p {
  font-size: 14px;
}

.profile-field input,
.profile-field select,
.profile-subject-option,
.search-field input,
.search-results strong,
.hover-card strong,
.topic-list strong,
.question-card p,
.related-list strong,
.cluster-card strong,
.guide-dialog li span {
  font-size: 13px;
}

.brand-copy small,
.topbar-metrics b,
.saved-indicator,
.profile-field small,
.profile-subject-field small,
.search-results span,
.search-results small,
.filter-chip-count,
.data-note,
.canvas-toolbar output,
.visible-count strong,
.visible-count span,
.hover-card span,
.topic-list small,
.parent-summary span,
.topic-state,
.parent-topic-meta,
.parent-card-info span,
.selected-meta,
.ontology-identity > div,
.ontology-identity code,
.path-heading b,
.path-summary span,
.path-summary b,
.path-examples code,
.related-list small,
.ontology-facts dt,
.ontology-facts dd,
.ontology-downloads span {
  font-size: 11px;
}

.eyebrow,
.mode-switcher button span,
.card-index,
.topic-list-code,
.inspector-head span,
.home-card span,
.question-card span,
.cluster-card > span,
.sequence-card > span,
.path-examples strong,
.dialog-head span,
.ontology-limits strong {
  font-size: 10px;
}

.path-legend > strong,
.search-block label,
.section-heading h2,
.privacy-note strong,
.detail-section h3,
.path-heading h3,
.sequence-card h3,
.ontology-limits strong,
.ontology-downloads strong,
.guide-dialog li b {
  font-size: 13px;
}

.legend-badge,
.relation-badge,
.path-examples strong {
  font-size: 11px;
}

.loading-panel strong,
.empty-state b {
  font-size: 14px;
}

.canvas-hint {
  max-width: calc(100% - 32px);
  font-size: 13px;
  line-height: 1.4;
  text-align: right;
}

@media (max-width: 860px) and (min-width: 721px) {
  .topbar-metrics {
    display: none;
  }
}

@media (max-width: 720px) {
  .topic-list-head h2,
  .parent-panel-head h2,
  .guide-dialog h2 {
    font-size: 30px;
  }

  .inspector-body h2 {
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .canvas-toolbar {
    grid-template-columns: 50px 34px 52px 34px;
  }

  .visible-count {
    padding-right: 8px;
    padding-left: 8px;
  }
}