:root {
  color-scheme: dark;
  --bg: #0b111b;
  --panel: #111c29;
  --line: #263446;
  --text: #e7edf5;
  --muted: #9aacc1;
  --mint: #59e0bd;
  --orange: #ffb16b;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--sans);
}
main {
  max-width: 1420px;
  margin: auto;
  padding: 26px 44px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 2px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}
.mark {
  background: var(--mint);
  color: var(--bg);
  padding: 1px 8px;
  border-radius: 5px;
  font: 700 22px/1.4 var(--mono);
}
.edition,
.eyebrow {
  font: 12px/1.7 var(--mono);
  letter-spacing: 1.5px;
  color: var(--muted);
}
.heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 0 26px;
}
.eyebrow {
  margin: 0 0 10px;
}
.eyebrow span {
  color: var(--orange);
  margin-left: 12px;
  font-size: 11px;
}
h1 {
  font-size: clamp(25px, 3vw, 39px);
  letter-spacing: -1.3px;
  line-height: 1.2;
  margin: 0 0 13px;
}
.heading p:last-child {
  margin: 0;
  color: var(--muted);
}
.accent {
  color: var(--mint);
  margin-left: 5px;
}
.complexity {
  text-align: right;
  color: var(--muted);
  font: 12px var(--mono);
}
.complexity b {
  display: block;
  font-size: 18px;
  color: var(--mint);
  margin: 10px 0;
}
.complexity small {
  font: 13px var(--sans);
}
.inputs {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 22px;
}
label {
  font-size: 14px;
  color: var(--muted);
  display: block;
}
.inputs label {
  width: 94px;
}
.inputs .array-input {
  flex: 1;
  min-width: 200px;
}
input,
select,
button {
  font: inherit;
}
input:not([type='range']),
select {
  color: var(--text);
  background: var(--field);
  border: 1px solid var(--line-2);
  border-radius: 6px;
  padding: 10px 12px;
  width: 100%;
  margin-top: 6px;
}
button {
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--text);
  padding: 10px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}
button:hover:not(:disabled) {
  background: var(--cell-2);
  border-color: var(--mint);
}
button:disabled {
  opacity: 0.35;
  cursor: default;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}
.apply {
  height: 47px;
}
.examples {
  flex-basis: 100%;
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
}
.examples button {
  font-weight: 400;
  font-size: 13px;
  padding: 3px 10px;
  border-color: var(--line-2);
}
#error {
  margin: 0;
  color: var(--danger);
  flex-basis: 100%;
  font-size: 14px;
}
#error:empty {
  display: none;
}
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(360px, 1fr);
  gap: 22px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 16px 22px;
  font-size: 14px;
  color: var(--muted);
}
.tag {
  font: 11px var(--mono);
  letter-spacing: 1px;
  color: var(--mint);
}
.stats {
  display: flex;
  gap: 35px;
  padding: 22px 26px 0;
}
.stats small {
  display: block;
  color: var(--muted);
  font: 13px var(--mono);
}
.stats b {
  font: 28px/1.5 var(--mono);
}
.stats .target {
  margin-left: auto;
  text-align: right;
}
.target b {
  color: var(--orange);
}
.array-scroll {
  overflow-x: auto;
  padding: 0 25px;
}
.array {
  position: relative;
  display: flex;
  gap: 8px;
  width: max-content;
  min-width: 100%;
  padding: 63px 0 34px;
}
.cell {
  width: 54px;
  flex-shrink: 0;
  position: relative;
  text-align: center;
}
.value {
  height: 56px;
  display: grid;
  place-items: center;
  background: var(--cell);
  border: 1px solid var(--line-2);
  border-radius: 7px;
  font: 21px var(--mono);
  transition:
    background 0.35s,
    color 0.35s,
    border-color 0.35s;
}
.cell.selected .value {
  background: var(--active-bg);
  border-color: var(--mint);
  color: var(--active-ink);
}
.cell.entering .value {
  border-color: var(--orange);
  color: var(--orange);
  background: var(--focus-bg);
}
.index {
  font: 12px var(--mono);
  color: var(--muted);
  margin-top: 12px;
}
.pointer {
  position: absolute;
  bottom: 87px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--mint);
  white-space: nowrap;
  font: 11px/1.5 var(--mono);
}
.pointer em {
  font-style: normal;
  color: var(--orange);
  display: block;
}
.window {
  position: absolute;
  top: 55px;
  height: 72px;
  border: 1px solid var(--mint);
  border-radius: 11px;
  background: color-mix(in srgb, var(--active) 3.5%, transparent);
  transition:
    transform 0.4s,
    width 0.4s;
  pointer-events: none;
  left: -5px;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: 12px;
  padding: 0 25px 20px;
}
.legend i {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  margin-right: 6px;
}
.mint {
  background: var(--mint);
}
.orange {
  background: var(--orange);
}
.start-range {
  border-top: 1px solid var(--line);
  margin: 0 25px;
  padding-top: 18px;
}
.section-label {
  font-size: 14px;
}
.section-label span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}
.starts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 13px 0 22px;
}
.start {
  width: 29px;
  height: 27px;
  display: grid;
  place-items: center;
  font: 12px var(--mono);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  color: var(--faint);
  transition: all 0.4s;
}
.start.active {
  background: var(--active-bg);
  border-color: var(--active-line);
  color: var(--active-ink);
}
.start.middle {
  background: var(--mint);
  color: var(--on-active);
  border-color: var(--mint);
}
.comparison {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  background: var(--well);
  border: 1px solid var(--line);
  margin: 0 25px;
  border-radius: 8px;
  padding: 14px 8px;
  text-align: center;
}
.comparison > div {
  flex: 1;
}
.comparison small,
.comparison span {
  display: block;
  color: var(--muted);
  font: 12px/1.8 var(--mono);
}
.comparison strong {
  display: block;
  font: 30px/1.5 var(--mono);
  color: var(--mint);
}
.comparison > div:last-child strong {
  color: var(--orange);
}
.comparison > b {
  font: 27px var(--mono);
  color: var(--muted);
}
.signed-note {
  margin: 10px 25px 20px;
  font-size: 12px;
  color: var(--muted);
}
.explanation {
  margin: 0 25px;
  min-height: 142px;
  border-left: 2px solid var(--mint);
  padding-left: 16px;
}
.explanation > span {
  color: var(--mint);
  font: 11px var(--mono);
  letter-spacing: 1px;
}
h2 {
  font-size: 18px;
  margin: 8px 0;
}
.explanation p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}
.explanation output {
  display: block;
  color: var(--mint);
  font: 20px/1.8 var(--mono);
}
.controls {
  padding: 18px 25px 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.primary {
  background: var(--mint);
  color: var(--on-active);
  border-color: var(--mint);
  flex: 1;
}
.primary:hover:not(:disabled) {
  background: var(--active-hover);
  color: var(--on-active);
}
.speed {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  font-size: 12px;
}
.speed select {
  width: auto;
  margin: 0;
  padding: 7px;
  font-size: 13px;
}
.timeline {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 7px 25px 20px;
}
.timeline input {
  width: 100%;
  accent-color: var(--mint);
}
.timeline span {
  white-space: nowrap;
  font: 12px var(--mono);
  color: var(--muted);
}
pre {
  font: 13px/2 var(--mono);
  margin: 0;
  padding: 25px 0;
  overflow-x: auto;
  tab-size: 4;
}
.code-line {
  display: block;
  padding: 0 16px 0 0;
  white-space: pre;
  min-width: max-content;
  border-left: 2px solid transparent;
}
.code-line.active {
  background: color-mix(in srgb, var(--active) 7.5%, transparent);
  border-left-color: var(--mint);
  color: var(--active-ink);
}
.line-number {
  display: inline-block;
  width: 38px;
  text-align: right;
  margin-right: 14px;
  color: var(--faint);
  font-size: 11px;
  user-select: none;
}
.insight {
  padding: 25px;
  border-top: 1px solid var(--line);
}
.insight p {
  font-size: 14px;
  color: var(--muted);
}
.insight code {
  font-size: 12px;
  color: var(--text);
}
.mini {
  display: flex;
  gap: 7px;
  margin-top: 24px;
}
.mini > * {
  width: 34px;
  height: 30px;
  border-radius: 4px;
  text-align: center;
}
.mini span {
  border: 1px solid var(--mint);
  color: var(--mint);
}
.mini i {
  background: var(--cell-2);
}
.mini em {
  border: 1px solid var(--orange);
  color: var(--orange);
  font-style: normal;
}
.insight > small {
  font-size: 12px;
  color: var(--muted);
}
footer {
  display: flex;
  justify-content: space-between;
  color: var(--faint);
  font-size: 12px;
  margin-top: 26px;
  padding-bottom: 18px;
}
@media (max-width: 1050px) {
  main {
    padding: 22px;
  }
  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }
  .complexity {
    display: none;
  }
  .code-panel pre {
    font-size: 14px;
  }
}
@media (max-width: 560px) {
  main {
    padding: 16px 12px;
  }
  .edition {
    display: none;
  }
  .heading {
    padding: 25px 4px;
  }
  .heading p:last-child {
    font-size: 14px;
  }
  .inputs {
    padding: 16px;
    gap: 10px;
  }
  .inputs .array-input {
    flex-basis: 100%;
  }
  .inputs label {
    flex: 1;
  }
  .examples {
    flex-wrap: wrap;
  }
  .controls {
    padding-inline: 16px;
  }
  .controls button {
    padding: 9px 10px;
  }
  .stats {
    gap: 24px;
  }
  .panel-head {
    padding-inline: 16px;
  }
  footer {
    display: block;
  }
  footer span {
    display: block;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* Compact workspace:keep the active trace and controls in the same viewport. */
main {
  max-width: 1600px;
  padding: 12px 18px;
}
header {
  padding-bottom: 7px;
}
.mark {
  font-size: 17px;
}
.brand {
  font-size: 12px;
}
.heading {
  padding: 10px 0;
  gap: 15px;
}
.heading .eyebrow {
  display: none;
}
h1 {
  font-size: 24px;
  margin: 0 0 3px;
  letter-spacing: -0.6px;
}
.heading p:last-child {
  font-size: 13px;
}
.complexity b {
  font-size: 14px;
  margin: 3px 0;
}
.inputs {
  padding: 9px 12px;
  gap: 6px 10px;
  margin-bottom: 10px;
  border-radius: 8px;
}
.inputs label {
  width: 70px;
  font-size: 12px;
}
.inputs .array-input {
  min-width: 120px;
}
input:not([type='range']) {
  padding: 5px 8px;
  margin-top: 2px;
  font-size: 14px;
}
.apply {
  height: 34px;
  padding: 5px 12px;
}
.examples {
  gap: 7px;
}
.examples button {
  padding: 1px 8px;
  font-size: 12px;
}
.workspace {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 10px;
  align-items: stretch;
}
.panel {
  border-radius: 8px;
}
.panel-head {
  padding: 7px 12px;
  font-size: 13px;
}
.stats {
  padding: 8px 14px 0;
  gap: 22px;
}
.stats > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.stats b {
  font-size: 21px;
}
.stats small {
  font-size: 12px;
}
.array-scroll {
  padding: 0 14px;
}
.array {
  padding: 30px 0 9px;
}
.value {
  height: 42px;
  font-size: 19px;
}
.index {
  margin-top: 5px;
}
.pointer {
  bottom: 63px;
  font-size: 11px;
}
.window {
  top: 25px;
  height: 52px;
  border-radius: 8px;
}
.legend {
  padding: 0 14px 8px;
  gap: 8px;
  font-size: 12px;
}
.legend span:last-child {
  display: none;
}
.start-range {
  margin: 0 14px;
  padding-top: 6px;
}
.section-label {
  font-size: 12px;
}
.section-label span {
  display: inline;
  margin-left: 8px;
}
.starts {
  margin: 6px 0 9px;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
}
.start {
  flex: 0 0 24px;
  height: 22px;
}
.comparison {
  margin: 0 14px;
  padding: 6px;
}
.comparison strong {
  font-size: 24px;
  line-height: 1.2;
}
.comparison small,
.comparison span {
  line-height: 1.5;
}
.signed-note {
  margin: 5px 14px 8px;
  font-size: 12px;
  line-height: 1.4;
}
.explanation {
  margin: 0 14px;
  min-height: 102px;
  padding-left: 10px;
}
.explanation h2 {
  font-size: 16px;
  line-height: 1.4;
  margin: 3px 0;
}
.explanation p {
  font-size: 13px;
  line-height: 1.45;
}
.explanation output {
  font-size: 17px;
  line-height: 1.4;
}
.controls {
  padding: 8px 14px 3px;
  gap: 5px;
  flex-wrap: nowrap;
}
.controls button {
  padding: 6px 9px;
  font-size: 13px;
  white-space: nowrap;
}
.speed {
  gap: 4px;
}
.speed select {
  padding: 4px;
  font-size: 12px;
}
.timeline {
  padding: 3px 14px 9px;
  gap: 9px;
}
.timeline input {
  margin: 0;
  height: 16px;
}
pre,
.code-panel pre {
  font-size: 12px;
  line-height: 1.65;
  padding: 10px 0;
  overflow-x: hidden;
}
.code-line {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  min-width: 0;
  padding: 0 8px 0 32px;
  text-indent: -32px;
}
.line-number {
  width: 22px;
  margin-right: 8px;
  font-size: 11px;
}
.insight {
  padding: 10px 14px;
}
.insight .eyebrow {
  font-size: 11px;
}
.insight h2 {
  font-size: 16px;
  margin: 4px 0;
}
.insight p {
  font-size: 13px;
  line-height: 1.5;
  margin: 7px 0;
}
.mini,
.insight > small {
  display: none;
}
footer {
  margin-top: 7px;
  padding: 0;
  font-size: 11px;
}
@media (min-width: 850px) and (min-height: 850px) {
  main {
    padding: 18px 26px;
  }
  .heading {
    padding: 16px 0;
  }
  h1 {
    font-size: 28px;
  }
  .inputs {
    padding: 12px 16px;
  }
  .stats {
    padding-top: 15px;
  }
  .array {
    padding-top: 42px;
    padding-bottom: 18px;
  }
  .window {
    top: 37px;
  }
  .explanation {
    min-height: 114px;
  }
  .controls {
    padding-top: 14px;
  }
  pre,
  .code-panel pre {
    font-size: 13px;
    line-height: 1.8;
  }
}
@media (min-width: 600px) and (max-width: 849px) {
  main {
    padding: 8px;
  }
  .heading {
    padding: 7px 0;
  }
  h1 {
    font-size: 20px;
  }
  .heading p:last-child {
    font-size: 12px;
  }
  .workspace {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 7px;
  }
  .stats {
    gap: 10px;
  }
  .stats > div {
    gap: 4px;
  }
  .stats b {
    font-size: 18px;
  }
  .stats small {
    font-size: 11px;
  }
  .controls {
    padding-inline: 8px;
    gap: 4px;
  }
  .controls button {
    font-size: 12px;
    padding: 6px;
  }
  .speed {
    font-size: 0;
  }
  .speed select {
    font-size: 12px;
    width: 48px;
  }
  .explanation {
    min-height: 120px;
  }
  .section-label span {
    display: none;
  }
  .legend {
    gap: 5px;
  }
  .comparison small {
    font-size: 11px;
  }
  .signed-note {
    font-size: 11px;
  }
  .insight {
    padding: 8px 10px;
  }
  .insight p {
    font-size: 12px;
  }
  .insight h2 {
    font-size: 14px;
  }
  footer span:last-child {
    display: none;
  }
}
@media (max-width: 599px) {
  main {
    padding: 10px;
  }
  .workspace {
    grid-template-columns: 1fr;
  }
  .heading {
    padding: 9px 0;
  }
  .heading h1 {
    font-size: 21px;
  }
  .inputs .array-input {
    flex-basis: 100%;
  }
  .inputs {
    padding: 8px;
  }
  .stats {
    gap: 16px;
  }
  .examples {
    gap: 5px;
  }
  .examples button {
    padding: 1px 5px;
  }
  .explanation {
    min-height: 94px;
  }
  .code-panel {
    margin-top: 0;
  }
  footer {
    display: none;
  }
}
.insight summary {
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.code-line.blank {
  display: none;
}
@media (min-width: 600px) and (max-height: 800px) {
  header {
    display: none;
  }
  .heading {
    padding: 2px 0 7px;
  }
  .heading p:last-child {
    display: none;
  }
  .inputs {
    padding: 6px 10px;
    margin-bottom: 7px;
  }
  .examples {
    line-height: 1.4;
  }
  .comparison > div {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    column-gap: 5px;
    padding: 0 5px;
  }
  .comparison strong {
    grid-column: 2;
    grid-row: 1 / 3;
  }
  .comparison small,
  .comparison span {
    grid-column: 1;
  }
  .comparison > b {
    font-size: 20px;
  }
  .explanation {
    min-height: 89px;
  }
  .explanation > span {
    font-size: 10px;
  }
  .explanation h2 {
    font-size: 14px;
  }
  .explanation p {
    font-size: 12px;
  }
  .explanation output {
    font-size: 15px;
  }
  .signed-note {
    margin-block: 4px 6px;
  }
  .array {
    padding-top: 25px;
    padding-bottom: 6px;
  }
  .window {
    top: 20px;
  }
  footer {
    display: none;
  }
  .insight {
    padding: 8px 10px;
  }
}
@media (min-width: 600px) and (max-width: 849px) {
  .comparison > div {
    display: block;
    padding: 0 2px;
  }
  .comparison strong {
    font-size: 20px;
  }
  .comparison small {
    font-size: 10px;
  }
  .comparison span {
    font-size: 11px;
  }
  .comparison {
    padding-block: 3px;
  }
  .explanation {
    min-height: 78px;
  }
  .value {
    font-size: 16px;
  }
}

.back-home {
  display: inline-block;
  font: 12px/1.5 var(--sans);
  color: var(--mint);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 3px 7px;
  margin-right: 10px;
  vertical-align: middle;
  letter-spacing: 0;
}
.back-home:hover {
  border-color: var(--mint);
}

.pointers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 14px;
  font: 12px var(--mono);
}
.pointer-chip {
  background: var(--cell);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 3px 7px;
}
.graph-scroll {
  overflow: auto;
  margin: 0 14px 7px;
}
.graph-scroll svg {
  display: block;
  min-width: 100%;
  height: 205px;
}
.graph-node {
  fill: var(--cell);
  stroke: var(--line-3);
  stroke-width: 1.5;
}
.graph-node.in-range {
  fill: var(--active-bg);
  stroke: var(--active);
}
.graph-node.changed {
  stroke: var(--focus);
  stroke-width: 3;
}
.node-text {
  fill: var(--text);
  font: 15px var(--mono);
  text-anchor: middle;
}
.node-id {
  fill: var(--muted);
  font: 11px var(--mono);
  text-anchor: middle;
}
.edge {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.5;
}
.edge.changed {
  stroke: var(--focus);
  stroke-width: 2.5;
}
.null-text {
  fill: var(--muted);
  font: 10px var(--mono);
  text-anchor: middle;
}
.chain {
  font: 12px/1.6 var(--mono);
  color: var(--mint);
  padding: 6px 0 10px;
  overflow-wrap: anywhere;
}
.comparison strong {
  font-size: 16px;
  overflow-wrap: anywhere;
}
.comparison > div {
  display: block !important;
}
.explanation output {
  overflow-wrap: anywhere;
}
@media (max-width: 400px) {
  .controls {
    flex-wrap: wrap;
  }
}

/* Shared Algo Animation presentation. */
main {
  max-width: 1480px;
  padding: 20px 24px;
}
.heading {
  padding: 18px 0;
}
.heading h1 {
  line-height: 1.35;
}
.panel-head {
  padding: 11px 16px;
}
.workspace {
  gap: 16px;
  align-items: start;
}
.inputs {
  padding: 12px 14px;
  margin-bottom: 16px;
}
.explanation {
  padding-block: 5px;
  min-height: 110px;
}
.controls {
  flex-wrap: wrap;
  padding-top: 12px;
}
.stats {
  flex-wrap: wrap;
}
.code-panel pre {
  overflow-x: auto;
}
.code-line {
  overflow-wrap: normal;
}
.insight {
  padding: 14px 16px;
}
footer {
  padding-top: 8px;
}
@media (max-width: 849px) {
  .workspace {
    grid-template-columns: 1fr;
  }
  main {
    padding: 14px;
  }
  .heading {
    padding: 12px 0;
  }
  .code-panel pre {
    max-height: 420px;
    overflow: auto;
  }
}
@media (max-width: 400px) {
  .controls .speed {
    margin-left: 0;
  }
  .heading h1 {
    font-size: 20px;
  }
}