:root {
  color-scheme: dark;
  --bg: #0b1220;
  --panel: #111c2e;
  --raised: #172438;
  --border: #29384e;
  --text: #e5edf7;
  --muted: #9aacc3;
  --cyan: #4fc9dc;
  --violet: #a78bfa;
  --amber: #f6bf60;
  --green: #6dd6a3;
  --coral: #f68c85;
  font-family: 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 14px;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
button,
input,
select {
  font: inherit;
}
button,
a,
input,
select,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--raised);
  color: var(--text);
  font-weight: 550;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background 0.12s,
    border-color 0.12s;
}
button:hover {
  background: #22334b;
  border-color: #50647f;
}
button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
button.primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #091723;
  min-width: 130px;
  font-weight: 700;
}
button.primary:hover {
  background: #7cdeec;
}
button.quiet {
  background: transparent;
  color: var(--muted);
}
button[aria-pressed='true']:not(.primary) {
  background: #203a4b;
  border-color: #4c9eac;
  color: #8be3ef;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
.maze-viewport:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
input,
select {
  width: 100%;
  min-width: 0;
  min-height: 40px;
  color: var(--text);
  background: #0e192a;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
}
select {
  cursor: pointer;
}
input[type='range'] {
  min-height: 20px;
  padding: 0;
  accent-color: var(--cyan);
  border: 0;
  background: transparent;
  cursor: pointer;
}
label {
  display: block;
  color: #b5c3d5;
  font-size: 12px;
  font-weight: 550;
}
label input,
label select {
  margin-top: 6px;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1,
h2,
h3 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.15px;
}
p {
  color: var(--muted);
}
a {
  color: var(--cyan);
  text-decoration: none;
}
.icon {
  width: 17px;
  height: 17px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.app-shell {
  width: min(1680px, 100%);
  margin: auto;
  padding: 0 36px;
}
.app-header {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}
.header-actions {
  display: flex;
  gap: 12px;
}
.header-actions button {
  background: transparent;
}
.header-actions #demoBtn {
  color: #99e3ec;
}
main {
  padding: 24px 0 32px;
}
.text-link {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  font-size: 12px;
}
.text-link:hover {
  text-decoration: underline;
}
.workspace-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.workspace-column,
.inspector {
  min-width: 0;
}
.workspace-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.panel-heading {
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.heading-inline {
  display: flex;
  gap: 12px;
  align-items: center;
}
.workspace-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.workspace-actions .text-link {
  min-height: 40px;
  padding-inline: 4px;
}
.subtle {
  color: var(--muted);
  font-size: 12px;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #b6c6d8;
  font-size: 12px;
  font-weight: 600;
  background: #1b2a3d;
  border: 1px solid #34465e;
  border-radius: 20px;
  padding: 4px 12px;
  white-space: nowrap;
}
.status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.status[data-state='searching'],
.status[data-state='generating'] {
  color: var(--cyan);
  border-color: #2b6372;
  background: #152e3e;
}
.status[data-state='done'] {
  color: var(--green);
}
.status[data-state='paused'] {
  color: var(--amber);
}
.status[data-state='no-path'] {
  color: var(--coral);
}
.drawing-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 0 20px 16px;
  flex-wrap: wrap;
}
.segmented {
  display: flex;
  background: #0b1525;
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 3px;
  gap: 2px;
}
.segmented button {
  min-height: 34px;
  border: 1px solid transparent;
  padding: 6px 10px;
  font-size: 12px;
  background: transparent;
  color: var(--muted);
  gap: 6px;
}
.view-tools {
  display: flex;
  gap: 5px;
}
.view-tools button {
  font-size: 11px;
  min-height: 32px;
  padding: 5px 8px;
  background: transparent;
}
.view-tools .icon {
  width: 14px;
  height: 14px;
}
.board-stage {
  background: #0b1525;
  border-top: 1px solid #24334a;
  border-bottom: 1px solid #24334a;
  padding: 20px;
  position: relative;
}
.maze-viewport {
  height: clamp(300px, 52vh, 590px);
  width: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  touch-action: none;
  display: block;
  border-radius: 3px;
  scrollbar-color: #475e78 #0b1525;
  scrollbar-width: thin;
}
.maze-viewport.panning {
  cursor: grab;
}
.maze-viewport.panning:active {
  cursor: grabbing;
}
.grid {
  display: grid;
  gap: 0;
  width: max-content;
  margin: auto;
  isolation: isolate;
  --cell: 24px;
  grid-auto-rows: var(--cell);
  border: 1px solid #35435a;
  background: #35435a;
}
.cell {
  width: var(--cell);
  height: var(--cell);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #17263a;
  border: solid #26384e;
  border-width: 0 1px 1px 0;
  font-size: clamp(6px, calc(var(--cell) * 0.39), 14px);
  line-height: 1;
  user-select: none;
  position: relative;
  cursor: crosshair;
  color: #bacbdd;
  font-weight: 650;
  transition: background-color 80ms linear;
}
.cell.wall {
  background: #53627a;
  border-color: #5d6c83;
}
.cell.weighted {
  background: #253248;
}
.cell.frontier {
  background: #665291;
  color: #ece2ff;
  border-color: #7863a4;
}
.cell.frontier::after {
  content: '';
  position: absolute;
  width: 18%;
  height: 18%;
  border: 1px solid #e1d4ff;
  border-radius: 50%;
  right: 9%;
  top: 9%;
}
.cell.explored {
  background: #204f63;
  border-color: #306578;
  color: #99e7ed;
}
.cell.path {
  background: var(--amber);
  border-color: #c59243;
  color: #31210b;
}
.cell.path::after {
  content: '';
  position: absolute;
  width: 24%;
  height: 24%;
  background: #785218;
  border-radius: 50%;
}
.cell.start {
  background: var(--green);
  border-color: #4ba77d;
  color: #0c3325;
  z-index: 1;
}
.cell.goal {
  background: var(--coral);
  border-color: #c36964;
  color: #3e171a;
  z-index: 1;
}
.cell.start::after,
.cell.goal::after {
  display: none;
}
.cell.active {
  box-shadow: inset 0 0 0 2px #f4f7fb;
  z-index: 2;
}
.cell.active::before {
  content: '+';
  position: absolute;
  font-weight: 900;
  font-size: calc(var(--cell) * 0.68);
  color: #fff;
  line-height: 1;
}
.cell.active:not(.start):not(.goal) {
  color: transparent;
}
.cell.keyboard {
  outline: 2px solid white;
  outline-offset: -2px;
  z-index: 3;
}
.board-caption {
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
}
.board-caption #cellPosition {
  white-space: nowrap;
}
.playback-toolbar {
  border-top: 1px solid var(--border);
  padding: 16px 20px 12px;
  display: flex;
  align-items: end;
  gap: 8px;
  flex-wrap: wrap;
}
.playback-toolbar button {
  font-size: 12px;
}
.legend {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  border-top: 1px solid #213047;
  padding: 13px 16px;
  color: var(--muted);
  font-size: 10px;
}
.legend > span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.swatch {
  display: inline-flex;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  font-style: normal;
  font-size: 9px;
  align-items: center;
  justify-content: center;
  color: #0c1728;
  line-height: 1;
  font-weight: 700;
}
.swatch.start {
  background: var(--green);
}
.swatch.goal {
  background: var(--coral);
}
.swatch.wall {
  background: #687891;
}
.swatch.frontier {
  background: #8972bd;
}
.swatch.explored {
  background: #327d94;
}
.swatch.active {
  border: 1px solid white;
  color: white;
}
.swatch.path {
  background: var(--amber);
}
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--panel);
  padding: 16px 0;
}
.metric {
  padding: 0 20px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.metric:last-child {
  border: 0;
}
.metric > span {
  font-size: 11px;
  color: #b3c2d5;
}
.metric strong {
  font-family: ui-monospace, 'Cascadia Code', Consolas, monospace;
  font-size: 27px;
  line-height: 1.5;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.metric:first-child strong {
  color: #83d9e6;
}
.metric:nth-child(2) strong {
  color: #b7a2e2;
}
.metric:nth-child(n + 3) strong {
  color: var(--amber);
}
.metric small {
  font-size: 10px;
  color: var(--muted);
}
.inspector {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 16px;
}
.paired-boards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--border);
}
.board-lane {
  min-width: 0;
  border-right: 1px solid var(--border);
}
.board-lane:last-child {
  border-right: 0;
}
.lane-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
}
.lane-heading label {
  width: 160px;
}
.board-lane .board-stage {
  padding: 12px;
}
.board-lane .metrics {
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 12px 0;
}
.board-lane .metric {
  padding: 0 12px;
  min-width: 0;
}
.board-lane .metric strong {
  font-size: 24px;
  overflow-wrap: anywhere;
}
.lane-analytics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.lane-analytics dt {
  color: var(--muted);
  font-size: 11px;
}
.lane-analytics dd {
  margin: 6px 0 0;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.lane-time {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  font-size: 11px;
}
.lane-time span {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.lane-description {
  padding: 4px 16px 16px;
}
.lane-description > p {
  font-size: 12px;
  line-height: 1.65;
}
.lane-description .guarantee {
  margin-bottom: 0;
}
.pair-note {
  padding: 10px 20px;
  font-size: 11px;
}
#gridWrapRight {
  touch-action: pan-x pan-y;
}
#workspace > .panel-heading {
  flex-wrap: wrap;
}
.workspace-actions {
  margin-left: auto;
}
@media (max-width: 900px) {
  .paired-boards {
    grid-template-columns: minmax(0, 1fr);
  }
  .board-lane {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .board-lane:last-child {
    border-bottom: 0;
  }
}
@media (max-width: 650px) {
  .playback-toolbar #genMazeBtn {
    width: calc(50% - 4px);
    min-height: 44px;
  }
  .board-lane .metric {
    padding: 12px;
  }
  .pair-note {
    padding: 10px 12px;
  }
  .lane-heading {
    padding: 12px;
  }
}
.algorithm-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 0 0 10px;
}
.algorithm-title h3 {
  font-size: 22px;
  letter-spacing: -0.5px;
}
.tag {
  font-size: 10px;
  padding: 3px 7px;
  border: 1px solid #355065;
  color: #8acbd8;
  border-radius: 4px;
  white-space: nowrap;
}
.guarantee {
  margin: 16px 0;
  padding-left: 12px;
  border-left: 2px solid #467c89;
  font-size: 11px;
  color: #afc7da;
  line-height: 1.65;
}
.fine-print {
  font-size: 10px !important;
  line-height: 1.65 !important;
  color: var(--muted);
}
.button-row {
  display: flex;
  gap: 8px;
}
.button-row button {
  flex: 1;
  font-size: 11px;
  padding: 8px;
}
summary {
  list-style: none;
  cursor: pointer;
  font-size: 12px;
  font-weight: 550;
  padding: 15px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
summary::-webkit-details-marker {
  display: none;
}
summary::after {
  content: '+';
  font-size: 17px;
  color: var(--muted);
  font-weight: 400;
}
details[open] > summary::after {
  content: '−';
}
.details-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 4px;
}
.details-content p {
  font-size: 11px;
}
.details-content > button {
  width: 100%;
}
.library {
  padding: 0 20px;
}
.library > summary {
  padding: 18px 0;
}
.library .details-content {
  padding-bottom: 20px;
}
.file-actions {
  display: flex;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.file-actions > button {
  flex: 1;
  font-size: 11px;
}
.notice {
  border: 1px solid #405e78;
  background: #182e43;
  color: #c3e4f3;
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 12px;
  margin-bottom: 16px;
}
.notice.error {
  border-color: #875558;
  background: #34232d;
  color: #ffbab3;
}
.demo-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid #4c4470;
  background: #1e2038;
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 12px;
  margin-bottom: 16px;
}
.demo-banner strong {
  color: #c7b3f4;
  margin-right: 8px;
}
.demo-banner button {
  font-size: 11px;
  min-height: 34px;
}
.sr-only {
  position: absolute;
  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: 16px;
  padding: 12px;
  background: var(--panel);
  z-index: 10;
}
.skip-link:focus {
  top: 8px;
}
[hidden] {
  display: none !important;
}
body.presentation #inspector,
body.presentation .drawing-toolbar {
  display: none;
}
body.presentation main {
  padding-top: 0;
}
body.presentation .workspace-layout {
  grid-template-columns: 1fr;
}
body.presentation .board-stage .maze-viewport {
  height: 58vh;
}
body.presentation .app-shell {
  max-width: 1800px;
}
body.presentation .app-header {
  min-height: 72px;
  margin-bottom: 20px;
}
body.presentation .metric strong {
  font-size: 36px;
}
body.presentation .metric > span {
  font-size: 14px;
}
body.presentation .metric small {
  font-size: 12px;
}
@media (min-width: 1650px) {
  .playback-toolbar {
    gap: 12px;
  }
  .board-stage {
    padding: 24px;
  }
  .drawing-toolbar .segmented button {
    padding-inline: 14px;
  }
}
@media (max-width: 1250px) {
  .app-shell {
    padding: 0 24px;
  }
  .workspace-layout {
    gap: 16px;
    grid-template-columns: minmax(0, 1fr);
  }
  .drawing-toolbar {
    gap: 10px;
  }
  .metric {
    padding: 0 14px;
  }
  .metric small {
    font-size: 9px;
  }
  .legend {
    gap: 10px 14px;
  }
  .board-stage {
    padding: 16px;
  }
}
@media (max-width: 1000px) {
  .workspace-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .library {
    grid-column: 1/-1;
  }
  .app-shell {
    padding: 0 20px;
  }
  .drawing-toolbar {
    flex-wrap: nowrap;
  }
  .metric small {
    font-size: 11px;
  }
  .metric > span {
    font-size: 12px;
  }
  .board-stage .maze-viewport {
    height: 52vh;
  }
}
@media (max-width: 650px) {
  .app-shell {
    padding: 0 12px;
  }
  .app-header {
    min-height: 64px;
    gap: 10px;
  }
  .header-actions {
    gap: 6px;
  }
  .header-actions button {
    font-size: 11px;
    padding: 8px;
    min-height: 44px;
    gap: 6px;
  }
  .header-actions #presentationBtn .icon {
    display: none;
  }
  .header-actions #presentationBtn span {
    font-size: 0;
  }
  .header-actions #presentationBtn span::after {
    content: 'Present';
    font-size: 11px;
  }
  .header-actions #presentationBtn[aria-pressed='true'] span::after {
    content: 'Exit';
  }
  main {
    padding-top: 16px;
  }
  .panel-heading {
    padding: 16px 12px;
  }
  .heading-inline {
    gap: 8px;
  }
  .heading-inline h1 {
    font-size: 13px;
  }
  .heading-inline .subtle {
    font-size: 10px;
  }
  .workspace-actions {
    gap: 8px;
  }
  .workspace-actions .text-link {
    min-height: 44px;
  }
  .status {
    font-size: 10px;
    padding: 4px 9px;
  }
  .drawing-toolbar {
    padding: 0 10px 12px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .segmented {
    width: 100%;
    justify-content: space-between;
  }
  .segmented button {
    flex: 1;
    padding: 8px 4px;
    font-size: 10px;
    min-height: 44px;
    gap: 4px;
    flex-direction: column;
  }
  .segmented .icon {
    width: 16px;
    height: 16px;
  }
  .view-tools {
    width: 100%;
    justify-content: end;
  }
  .view-tools button {
    min-height: 44px;
    padding: 8px 14px;
  }
  .view-tools #panBtn {
    margin-right: auto;
  }
  .board-stage {
    padding: 10px;
  }
  .board-stage .maze-viewport {
    height: 340px;
  }
  .board-caption {
    padding: 10px 12px;
    font-size: 10px;
    align-items: start;
  }
  .board-caption #boardHelp {
    max-width: 225px;
  }
  .board-caption #cellPosition {
    font-size: 9px;
  }
  .playback-toolbar {
    padding: 12px;
    gap: 8px;
    align-items: end;
  }
  .playback-toolbar #runBtn {
    width: calc(50% - 4px);
    min-height: 44px;
  }
  .playback-toolbar #stepBtn,
  .playback-toolbar #replayBtn,
  .playback-toolbar #resetBtn {
    flex: 1;
    min-height: 44px;
    font-size: 11px;
    padding: 8px 6px;
  }
  .legend {
    justify-content: flex-start;
    padding: 12px;
    gap: 10px 14px;
    font-size: 9px;
  }
  .metrics {
    grid-template-columns: 1fr 1fr;
    padding: 0;
  }
  .metric {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
  }
  .metric:nth-child(2) {
    border-right: 0;
  }
  .metric:nth-child(3),
  .metric:nth-child(4) {
    border-bottom: 0;
  }
  .metric strong {
    font-size: 28px;
  }
  .metric small {
    font-size: 10px;
  }
  .inspector {
    display: block;
  }
  .inspector button {
    min-height: 44px;
  }
  .library {
    padding: 0 20px;
  }
  .demo-banner {
    align-items: start;
    padding: 12px;
    flex-direction: column;
    gap: 8px;
  }
  .demo-banner button {
    min-height: 40px;
  }
  .demo-banner strong {
    display: block;
  }
  .notice {
    font-size: 11px;
  }
  body.presentation .app-header {
    margin-bottom: 12px;
  }
  body.presentation .metric strong {
    font-size: 30px;
  }
  body.presentation .metric > span {
    font-size: 12px;
  }
  body.presentation .metric small {
    font-size: 10px;
  }
  body.presentation .board-stage .maze-viewport {
    height: 48vh;
  }
}
.skip-link:not(:focus) {
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
}
.cell.path.weighted::after {
  display: none;
}
.cell.active.start::before,
.cell.active.goal::before {
  content: '';
}
.cell.wall {
  background: #697b94;
  border-color: #75869e;
}
.cell.explored:not(.start):not(.goal):not(.path) {
  background: #307b91;
  border-color: #428296;
  color: #edfbff;
}
.cell.frontier:not(.start):not(.goal) {
  background: #8169af;
  border-color: #947fbc;
  color: #f5f0ff;
}
.swatch.wall {
  background: #697b94;
}
.swatch.explored {
  background: #307b91;
}
.swatch.frontier {
  background: #8169af;
}
@media (max-width: 650px) {
  .board-stage .maze-viewport {
    height: clamp(220px, calc((100vw - 48px) * var(--board-ratio, 1)), 340px);
  }
}
@media (min-width: 1001px) {
  .app-header {
    min-height: 64px;
  }
  .board-stage .maze-viewport {
    height: clamp(300px, 44vh, 500px);
  }
  .lane-description > p {
    font-size: 13px;
  }
  .guarantee {
    font-size: 12px;
  }
  .playback-toolbar button,
  .segmented button {
    font-size: 13px;
  }
  .metric > span {
    font-size: 12px;
  }
  .metric small,
  .legend {
    font-size: 11px;
  }
  body.presentation .board-stage .maze-viewport {
    height: clamp(240px, calc(100dvh - 430px), 700px);
  }
  body.presentation .metric strong {
    font-size: 32px;
  }
  body.presentation .metric small {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}