:root {
  --paper: #f4efe4;
  --paper-deep: #e9e0d0;
  --surface: #fffdf8;
  --surface-soft: #faf6ed;
  --ink: #182a2a;
  --ink-soft: #566462;
  --ink-faint: #84908d;
  --line: #d9d0c0;
  --line-strong: #b9ad99;
  --teal: #164f4b;
  --teal-light: #dceae5;
  --cinnabar: #b94d35;
  --cinnabar-light: #f5ddd5;
  --gold: #a97822;
  --gold-light: #f5e8c9;
  --blue: #355e7d;
  --blue-light: #dfeaf1;
  --plum: #77556e;
  --plum-light: #ece2ea;
  --shadow-sm: 0 1px 2px rgb(28 42 38 / 5%), 0 7px 22px rgb(57 42 23 / 5%);
  --shadow-md: 0 2px 4px rgb(28 42 38 / 5%), 0 18px 48px rgb(57 42 23 / 9%);
  --serif: Arial, sans-serif;
  --sans: Arial, sans-serif;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 8%, rgb(255 255 255 / 70%) 0, transparent 28rem),
    linear-gradient(180deg, #f6f1e8 0, var(--paper) 34rem, #eee7da 100%);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgb(185 77 53 / 28%);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  color: #fff;
  background: var(--teal);
  border-radius: 6px;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  width: 100%;
  margin: 0;
  padding: 1em 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: #b795c0;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--surface);
  background: var(--teal);
  border-radius: 50% 50% 46% 54%;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 14%);
  font-family: var(--serif);
  font-size: 27px;
  font-style: italic;
  line-height: 1;
}

.brand-name,
.brand-note {
  display: block;
}

.brand-name {
  margin: 0;
  font-family: var(--sans);
  font-size: 150%;
  font-weight: 700;
  letter-spacing: normal;
  line-height: normal;
}

.brand-note {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.local-badge {
  position: absolute;
  right: 1em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  color: #fff;
  border: 1px solid rgb(255 255 255 / 55%);
  border-radius: 999px;
  background: rgb(255 255 255 / 14%);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.local-badge > span:first-child {
  width: 7px;
  height: 7px;
  background: #4f8463;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgb(79 132 99 / 13%);
}

main {
  width: min(1180px, calc(100% - 48px));
  min-height: calc(100vh - 170px);
  margin: 0 auto;
}

.group-selector {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  padding: 28px 0 0;
  border: 0;
  text-align: center;
}

.group-options {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(150px, 1fr));
  gap: 4px;
  padding: 4px;
  background: rgb(255 253 248 / 78%);
  border: 1px solid var(--line);
  border-radius: 11px;
  box-shadow: var(--shadow-sm);
}

.group-options label {
  position: relative;
  cursor: pointer;
}

.group-options input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.group-options span {
  min-height: 42px;
  padding: 9px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  color: var(--ink-soft);
  border-radius: 7px;
  font-size: 14px;
  font-weight: 700;
  transition: color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.group-options input:checked + span {
  color: #fff;
  background: var(--teal);
  box-shadow: 0 3px 12px rgb(22 79 75 / 18%);
}

.group-options input:focus-visible + span {
  outline: 3px solid rgb(185 77 53 / 28%);
  outline-offset: 3px;
}

.hero {
  min-height: 475px;
  padding: 38px 0 74px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(430px, 0.95fr);
  align-items: center;
  gap: clamp(52px, 8vw, 112px);
}

.eyebrow,
.section-kicker,
.pbp-overline {
  margin: 0 0 12px;
  color: var(--cinnabar);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
h5,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-family: var(--serif);
  font-size: clamp(43px, 5.1vw, 68px);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.99;
}

h1 em {
  color: var(--teal);
  font-weight: 400;
}

.lede {
  max-width: 600px;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.program-description {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 19px;
  line-height: 1.65;
}

.math {
  font-family: var(--serif);
  font-style: italic;
}

.calculator-card {
  position: relative;
  padding: 28px;
  background: rgb(255 253 248 / 91%);
  border: 1px solid rgb(185 173 153 / 68%);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.calculator-card::before {
  content: "";
  position: absolute;
  top: -1px;
  right: 28px;
  left: 28px;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), #4a7b6f 55%, var(--cinnabar));
  border-radius: 0 0 3px 3px;
}

.calculator-card label {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 720;
  letter-spacing: 0.01em;
}

.input-row {
  display: flex;
  gap: 10px;
}

.orbit-input-wrap {
  min-width: 0;
  flex: 1;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 13px;
  color: var(--ink-faint);
  background: #fffefa;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  box-shadow: inset 0 1px 2px rgb(40 47 42 / 3%);
  font-family: var(--serif);
  font-size: 22px;
}

.orbit-input-wrap:focus-within {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgb(22 79 75 / 10%);
}

.orbit-input-wrap.invalid {
  border-color: var(--cinnabar);
  box-shadow: 0 0 0 3px rgb(185 77 53 / 10%);
}

#orbit-input {
  width: 100%;
  min-width: 0;
  height: 52px;
  padding: 0 4px;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.015em;
}

.primary-button {
  min-width: 136px;
  height: 54px;
  padding: 0 17px 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  color: #fff;
  background: var(--teal);
  border: 1px solid var(--teal);
  border-radius: 8px;
  box-shadow: 0 5px 15px rgb(22 79 75 / 17%);
  cursor: pointer;
  font-size: 13px;
  font-weight: 720;
  transition: background 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}

.primary-button:hover:not(:disabled) {
  background: #0e403d;
  box-shadow: 0 7px 18px rgb(22 79 75 / 22%);
  transform: translateY(-1px);
}

.primary-button:active:not(:disabled) {
  transform: translateY(0);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.84;
}

.button-arrow {
  font-size: 19px;
  font-weight: 400;
  line-height: 1;
}

.button-spinner {
  width: 16px;
  height: 16px;
  display: none;
  border: 2px solid rgb(255 255 255 / 35%);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 750ms linear infinite;
}

.primary-button.is-loading .button-arrow {
  display: none;
}

.primary-button.is-loading .button-spinner {
  display: inline-block;
}

.field-hint,
.field-error {
  min-height: 19px;
  margin: 8px 0 0;
  font-size: 12px;
}

.field-hint {
  color: var(--ink-faint);
}

.field-error {
  display: none;
  color: var(--cinnabar);
  font-weight: 650;
}

.field-error:not(:empty) {
  display: block;
}

.examples {
  margin-top: 20px;
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  border-top: 1px solid var(--line);
}

.examples > span {
  margin-right: 3px;
  color: var(--ink-faint);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.example-chip {
  padding: 5px 8px;
  color: var(--teal);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 5px;
  cursor: pointer;
  font-family: var(--serif);
  font-size: 12px;
  transition: border-color 130ms ease, background 130ms ease;
}

.example-chip:hover {
  background: var(--teal-light);
  border-color: #9bb7ae;
}

.status-region {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.loading-view {
  min-height: 520px;
  padding: 68px 0;
  border-top: 1px solid var(--line);
}

.skeleton {
  display: block;
  background: linear-gradient(100deg, #e4dccf 10%, #f3ede3 38%, #e4dccf 66%);
  background-size: 240% 100%;
  border-radius: 8px;
  animation: shimmer 1.35s ease-in-out infinite;
}

.loading-heading {
  display: flex;
  align-items: center;
  gap: 18px;
}

.loading-orbit { width: 260px; height: 42px; }
.loading-meta { width: 140px; height: 24px; }
.loading-tower { height: 112px; margin: 36px 0 24px; }
.loading-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.loading-card { height: 330px; }

.results-view {
  padding: 68px 0 90px;
  border-top: 1px solid var(--line);
}

.results-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 36px;
}

.results-header h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 50px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.results-header h2 sup {
  font-size: 0.58em;
  vertical-align: super;
}

.results-subtitle {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.result-stats {
  display: flex;
  align-items: stretch;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgb(255 253 248 / 57%);
}

.stat {
  min-width: 92px;
  padding: 12px 18px;
  text-align: center;
}

.stat + .stat {
  border-left: 1px solid var(--line);
}

.stat strong,
.stat span {
  display: block;
}

.stat strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.1;
}

.stat span {
  margin-top: 4px;
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tower-panel {
  margin-top: 38px;
  padding: 26px 28px 29px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.panel-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.section-kicker {
  margin-bottom: 4px;
  font-size: 9px;
}

.panel-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
}

.final-form {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 14px;
}

.tower {
  margin-top: 22px;
  padding: 4px 0 2px;
  display: flex;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: thin;
}

.tower-stage {
  min-width: max-content;
  display: inline-flex;
  align-items: center;
}

.tower-node {
  min-width: 68px;
  padding: 9px 12px 8px;
  background: var(--surface-soft);
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  text-align: center;
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 600;
}

.tower-stage:first-child .tower-node,
.tower-stage:last-child .tower-node {
  color: #fff;
  background: var(--teal);
  border-color: var(--teal);
}

.tower-arrow {
  width: 28px;
  display: grid;
  place-items: center;
  color: var(--line-strong);
  font-size: 15px;
}

.k-navigation {
  position: sticky;
  z-index: 10;
  top: 0;
  margin-top: 34px;
  padding: 12px 0;
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(180deg, var(--paper) 68%, rgb(244 239 228 / 0%));
}

.k-navigation > span {
  flex: 0 0 auto;
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

#k-links {
  min-width: 0;
  padding: 2px;
  display: flex;
  gap: 5px;
  overflow-x: auto;
  scrollbar-width: none;
}

#k-links::-webkit-scrollbar { display: none; }

.k-link {
  min-width: 38px;
  height: 34px;
  padding: 0 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  background: rgb(255 253 248 / 70%);
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
  transition: color 130ms ease, border-color 130ms ease, background 130ms ease;
}

.k-link:hover {
  color: var(--teal);
  background: var(--surface);
  border-color: #9eb9b1;
}

.k-result {
  padding-top: 52px;
  scroll-margin-top: 58px;
}

.k-result + .k-result {
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.k-result-header {
  margin-bottom: 24px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.k-type-label {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
}

.k-ordinal {
  color: var(--cinnabar);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.k-type-label h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(27px, 3vw, 35px);
  font-weight: 500;
  letter-spacing: -0.02em;
}

.exact-k-label {
  max-width: 340px;
  overflow: hidden;
  color: var(--ink-faint);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.k-counts {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.k-counts strong {
  color: var(--ink);
  font-weight: 720;
}

.multi-pbp-note {
  margin: -10px 0 20px;
  padding: 9px 12px;
  color: var(--teal);
  background: var(--teal-light);
  border: 1px solid #bdd0ca;
  border-radius: 7px;
  font-size: 11px;
  line-height: 1.5;
}

.pbp-groups {
  display: grid;
  gap: 22px;
}

.pbp-group {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 13px;
  box-shadow: var(--shadow-sm);
}

.pbp-group-header {
  padding: 20px 24px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgb(250 246 237 / 76%), rgb(255 253 248 / 60%));
}

.pbp-number {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--teal);
  background: var(--teal-light);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
}

.pbp-overline {
  margin: 0 0 2px;
  color: var(--ink-faint);
  font-size: 8px;
}

.pbp-title {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.pbp-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.tag {
  padding: 5px 8px;
  color: var(--ink-soft);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.tag.gamma {
  color: var(--teal);
  background: var(--teal-light);
  border-color: #b7cec7;
}

.tag.wp {
  color: #694d26;
  background: #fbf2dc;
  border-color: #dfc78f;
}

.tag.outer {
  color: var(--cinnabar);
  background: var(--cinnabar-light);
  border-color: #e7b9ac;
}

.invariants-shell {
  padding: 28px 24px 24px;
}

.painted-bipartition-panel {
  min-width: 0;
}

.tableaux-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr);
  align-items: stretch;
  gap: 12px;
}

.diagram-panel {
  min-width: 0;
  padding: 18px;
  background:
    linear-gradient(rgb(250 246 237 / 84%), rgb(250 246 237 / 84%)),
    repeating-linear-gradient(0deg, transparent, transparent 27px, rgb(185 173 153 / 16%) 28px);
  border: 1px solid #e1d8c9;
  border-radius: 9px;
}

.diagram-heading {
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-faint);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.diagram-letter {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  font-style: italic;
  font-weight: 700;
  line-height: 1;
}

.diagram-divider {
  display: grid;
  place-items: center;
  color: var(--line-strong);
  font-family: var(--serif);
  font-size: 20px;
}

.tableau {
  min-height: 36px;
  display: flex;
  align-items: flex-start;
  overflow-x: auto;
  scrollbar-width: thin;
}

.tableau-column {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
}

.tableau-column + .tableau-column {
  margin-left: -1px;
}

.tableau-cell {
  position: relative;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: #fffdf8;
  border: 1px solid #9e978b;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
}

.tableau-column .tableau-cell + .tableau-cell {
  margin-top: -1px;
}

.tableau-cell.marker-star {
  color: var(--ink-soft);
  background: #f5f1e9;
}

.tableau-cell.marker-c {
  color: #8b3827;
  background: var(--cinnabar-light);
}

.tableau-cell.marker-d {
  color: #244b67;
  background: var(--blue-light);
}

.tableau-cell.marker-s {
  color: #1f5d4d;
  background: var(--teal-light);
}

.tableau-cell.marker-r {
  color: #68475f;
  background: var(--plum-light);
}

.tableau-empty {
  padding: 7px 0;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
}

.marker-legend {
  margin: 16px 0 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  color: var(--ink-faint);
}

.marker-legend > span {
  margin-right: 3px;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.marker-legend code {
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--serif);
  font-size: 12px;
  font-weight: 700;
}

.associated-cycle-panel {
  min-width: 0;
  margin-top: 24px;
  padding: 20px;
  background: linear-gradient(145deg, #eef5f2, #f8f4ec 72%);
  border: 1px solid #c8d7d2;
  border-radius: 9px;
}

.associated-cycle-heading {
  margin-bottom: 14px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.cycle-kicker {
  display: block;
  margin-bottom: 2px;
  color: var(--teal);
  font-size: 8px;
  font-weight: 780;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.associated-cycle-heading h5 {
  margin: 0;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 650;
}

.cycle-count {
  flex: 0 0 auto;
  padding: 4px 7px;
  color: var(--teal);
  background: rgb(255 255 255 / 62%);
  border: 1px solid #c8d7d2;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 740;
}

.associated-cycle-terms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 9px;
}

.cycle-term {
  min-width: 0;
  padding: 11px 12px 12px;
  background: rgb(255 253 248 / 88%);
  border: 1px solid #d8d2c8;
  border-radius: 7px;
}

.cycle-term-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.cycle-term-number,
.cycle-coefficient,
.cycle-partition {
  color: var(--ink-faint);
  font-size: 8px;
  font-weight: 730;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cycle-coefficient {
  color: var(--cinnabar);
}

.cycle-partition {
  display: block;
  margin-top: 4px;
  overflow-wrap: anywhere;
  letter-spacing: 0.02em;
  text-transform: none;
}

.marked-diagram {
  margin: 10px 0 0;
  padding: 13px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  overflow-x: auto;
  background: #fffdf8;
  border: 1px solid var(--line);
  border-radius: 5px;
  scrollbar-width: thin;
}

.marked-diagram-row {
  display: flex;
  flex: 0 0 auto;
}

.marked-diagram-row + .marked-diagram-row {
  margin-top: -1px;
}

.marked-diagram-cell {
  width: 31px;
  height: 31px;
  flex: 0 0 31px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: #fffdf8;
  border: 1px solid #9e978b;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 750;
  line-height: 1;
}

.marked-diagram-cell + .marked-diagram-cell {
  margin-left: -1px;
}

.marked-diagram-cell.cycle-marker-plus {
  color: #1f5d4d;
  background: var(--teal-light);
}

.marked-diagram-cell.cycle-marker-minus {
  color: #244b67;
  background: var(--blue-light);
}

.marked-diagram-cell.cycle-marker-star {
  color: #68475f;
  background: var(--plum-light);
}

.marked-diagram-cell.cycle-marker-equal {
  color: #8b3827;
  background: var(--cinnabar-light);
}

.marked-diagram-empty {
  color: var(--ink-faint);
  font-family: var(--serif);
  font-style: italic;
}

.cycle-legend {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 5px 8px;
  color: var(--ink-faint);
  font-size: 8px;
  line-height: 1.25;
}

.cycle-legend code {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 10px;
  font-weight: 750;
}

.cycle-empty {
  margin: 0;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-style: italic;
}

.cycle-reference-note {
  margin: -5px 0 13px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 10px;
  line-height: 1.45;
}

.paths-block {
  padding: 20px 24px 24px;
  border-top: 1px solid var(--line);
  background: #fdfaf4;
}

.paths-heading {
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.paths-heading h5 {
  margin: 0;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.text-button {
  padding: 4px 0;
  color: var(--teal);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
}

.text-button:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.paths-list {
  display: grid;
  gap: 8px;
}

.path-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.path-card[open] {
  border-color: #b9c9c4;
  box-shadow: 0 4px 14px rgb(22 79 75 / 5%);
}

.path-card summary {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.path-card summary::-webkit-details-marker { display: none; }

.path-index {
  min-width: 25px;
  height: 25px;
  padding: 0 6px;
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 5px;
  font-family: var(--serif);
  font-size: 11px;
  font-weight: 700;
}

.path-summary-main {
  min-width: 0;
  flex: 1;
}

.path-name,
.path-preview {
  display: block;
}

.path-name {
  color: var(--ink);
  font-size: 12px;
  font-weight: 710;
}

.path-preview {
  margin-top: 1px;
  overflow: hidden;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-count {
  flex: 0 0 auto;
  color: var(--ink-faint);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.path-cycle-status {
  flex: 0 0 auto;
  padding: 4px 7px;
  border: 1px solid;
  border-radius: 999px;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.path-cycle-status-same {
  color: var(--teal);
  background: var(--teal-light);
  border-color: #bdd0ca;
}

.path-cycle-status-twisted {
  color: var(--cinnabar);
  background: var(--cinnabar-light);
  border-color: #dec2b9;
}

.path-chevron {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  border-right: 1.5px solid var(--ink-soft);
  border-bottom: 1.5px solid var(--ink-soft);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 150ms ease;
}

.path-card[open] .path-chevron {
  transform: rotate(225deg) translate(-1px, -1px);
}

.path-content {
  padding: 4px 16px 18px 49px;
}

.concrete-realization + .concrete-realization {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.realization-label {
  display: block;
  margin-bottom: 10px;
  color: var(--cinnabar);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.twist-histories {
  margin-bottom: 18px;
}

.path-associated-cycle {
  margin: 0 0 18px;
  padding: 14px;
  background: linear-gradient(145deg, #f3f7f5, #faf6ef 72%);
  border: 1px solid #cbd8d4;
  border-radius: 7px;
}

.path-cycle-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.path-cycle-heading h6 {
  margin: 0;
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 650;
}

.path-cycle-relation {
  flex: 0 0 auto;
  padding: 4px 7px;
  border: 1px solid;
  border-radius: 999px;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.path-cycle-relation-same {
  color: var(--teal);
  background: rgb(255 255 255 / 66%);
  border-color: #bdd0ca;
}

.path-cycle-relation-twisted {
  color: var(--cinnabar);
  background: var(--cinnabar-light);
  border-color: #dec2b9;
}

.path-cycle-explanation {
  margin: 8px 0 10px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 10px;
  line-height: 1.45;
}

.path-cycle-render > .cycle-count {
  display: inline-block;
  margin-bottom: 8px;
}

.path-associated-cycle .associated-cycle-terms {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.path-associated-cycle .cycle-term {
  background: rgb(255 253 248 / 94%);
}

.content-label {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-faint);
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.history-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.history {
  padding: 5px 8px;
  color: var(--teal);
  background: var(--teal-light);
  border: 1px solid #bdd0ca;
  border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 10px;
}

.chain-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: chain-step;
}

.chain-step {
  position: relative;
  min-height: 33px;
  padding: 0 0 13px 27px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 12px;
  overflow-wrap: anywhere;
  counter-increment: chain-step;
}

.chain-step::before {
  content: counter(chain-step);
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 17px;
  height: 17px;
  display: grid;
  place-items: center;
  color: var(--ink-faint);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-family: var(--sans);
  font-size: 8px;
  font-weight: 700;
}

.chain-step::after {
  content: "";
  position: absolute;
  top: 18px;
  bottom: -1px;
  left: 8px;
  width: 1px;
  background: var(--line);
}

.chain-step:last-child {
  padding-bottom: 0;
  color: var(--ink);
  font-weight: 650;
}

.chain-step:last-child::before {
  color: #fff;
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}

.chain-step:last-child::after { display: none; }

.no-results {
  padding: 40px 24px;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  text-align: center;
  font-family: var(--serif);
}

.sources {
  margin: 70px 0 54px;
  padding: 34px 38px;
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(28px, 6vw, 72px);
  background: rgb(255 253 248 / 62%);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.sources h2 {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(25px, 3vw, 34px);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.source-list {
  color: var(--ink-soft);
  font-size: 13px;
}

.source-list p {
  margin-bottom: 16px;
}

.source-list a {
  color: var(--teal);
  text-decoration-color: rgb(22 79 75 / 35%);
  text-underline-offset: 3px;
}

.source-list a:hover {
  text-decoration-color: currentColor;
}

.paper-references p {
  margin: 0;
}

.paper-references p + p {
  margin-top: 12px;
}

.sources-inline {
  margin: 30px 0 0;
  padding: 24px 26px;
  display: block;
}

.sources-inline .sources-heading {
  margin-bottom: 16px;
}

.sources-inline h2 {
  font-size: 25px;
}

.path-target {
  width: fit-content;
  padding: 2px 6px;
  color: var(--cinnabar);
  background: var(--cinnabar-light);
  border-radius: 4px;
  font-size: 10px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  to { background-position-x: -240%; }
}

@media (max-width: 900px) {
  .hero {
    padding: 44px 0 62px;
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-copy {
    max-width: 700px;
  }

  .calculator-card {
    max-width: 650px;
  }

  .results-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .tableaux-shell {
    grid-template-columns: minmax(0, 1fr) 20px minmax(0, 1fr);
    gap: 6px;
  }

  .sources {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  main {
    width: min(100% - 28px, 1180px);
  }

  .group-selector {
    width: 100%;
    padding-top: 22px;
  }

  .group-options {
    width: 100%;
    grid-template-columns: 1fr 1fr;
  }

  .group-options span {
    padding-right: 9px;
    padding-left: 9px;
    font-size: 13px;
  }

  .brand-note,
  .local-badge {
    display: none;
  }

  .hero {
    min-height: 0;
    padding: 34px 0 48px;
    gap: 32px;
  }

  h1 {
    font-size: clamp(38px, 12vw, 52px);
  }

  .lede {
    font-size: 14px;
  }

  .program-description {
    font-size: 16px;
  }

  .calculator-card {
    padding: 22px 18px 19px;
    border-radius: 12px;
  }

  .input-row {
    flex-direction: column;
  }

  .primary-button {
    width: 100%;
  }

  .examples > span {
    width: 100%;
    margin-bottom: 2px;
  }

  .loading-grid {
    grid-template-columns: 1fr;
  }

  .loading-card:nth-child(2) {
    display: none;
  }

  .results-view {
    padding-top: 48px;
  }

  .result-stats {
    width: 100%;
  }

  .stat {
    min-width: 0;
    flex: 1;
    padding-inline: 8px;
  }

  .tower-panel {
    padding: 21px 18px 24px;
  }

  .panel-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .k-navigation {
    margin-top: 24px;
  }

  .k-navigation > span {
    display: none;
  }

  .k-result {
    padding-top: 40px;
  }

  .k-result-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .k-type-label {
    width: 100%;
    flex-wrap: wrap;
    gap: 9px;
  }

  .exact-k-label {
    width: 100%;
    max-width: none;
    margin-left: 46px;
  }

  .pbp-group-header {
    padding: 16px;
    grid-template-columns: auto 1fr;
  }

  .pbp-tags {
    grid-column: 1 / -1;
    justify-content: flex-start;
    padding-left: 48px;
  }

  .tableaux-shell {
    grid-template-columns: 1fr;
  }

  .invariants-shell {
    padding: 20px 16px;
  }

  .associated-cycle-terms {
    grid-template-columns: 1fr;
  }

  .diagram-divider {
    height: 14px;
  }

  .diagram-divider span {
    transform: rotate(90deg);
  }

  .marker-legend {
    margin-inline: 16px;
  }

  .paths-block {
    padding: 17px 16px 20px;
  }

  .path-content {
    padding-left: 16px;
  }

  .history-count {
    display: none;
  }

  .sources {
    margin: 48px 0 36px;
    padding: 24px 20px;
  }

}

@media print {
  :root { --paper: #fff; --surface: #fff; }

  body { background: #fff; }
  .site-header, .group-selector, .hero, .loading-view, .k-navigation, .toggle-paths { display: none !important; }
  main { width: 100%; }
  .results-view { padding: 0; border: 0; }
  .pbp-group, .tower-panel { break-inside: avoid; box-shadow: none; }
  .path-card:not([open]) .path-content { display: none; }
}

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