:root {
  color-scheme: light;
  --paper: oklch(97.5% 0.012 80);
  --paper-deep: oklch(94.8% 0.018 78);
  --paper-blue: oklch(95% 0.018 240);
  --ink: oklch(24% 0.025 250);
  --ink-soft: oklch(43% 0.025 250);
  --ink-faint: oklch(50% 0.02 250);
  --line: oklch(82% 0.022 78);
  --line-strong: oklch(68% 0.025 78);
  --blue: oklch(49% 0.17 264);
  --blue-soft: oklch(91% 0.045 255);
  --rust: oklch(52% 0.17 25);
  --rust-soft: oklch(92% 0.047 36);
  --green: oklch(52% 0.125 150);
  --green-soft: oklch(92% 0.04 145);
  --focus: oklch(60% 0.18 250);
  --shadow: 0 10px 28px oklch(28% 0.03 250 / 0.065);
  --radius-sm: 0.4rem;
  --radius-md: 0.7rem;
  --radius-lg: 1rem;
  --page: min(1240px, calc(100vw - 2rem));
  --font-ui: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-prose: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(oklch(24% 0.025 250 / 0.026) 1px, transparent 1px),
    linear-gradient(90deg, oklch(24% 0.025 250 / 0.026) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background: oklch(98% 0.012 80 / 0.82);
  content: "";
}

a {
  color: inherit;
  text-decoration-color: color-mix(in oklch, currentColor 40%, transparent);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: currentColor;
}

button,
input,
select {
  color: inherit;
  font: inherit;
}

button,
select,
input[type="range"] {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid color-mix(in oklch, var(--focus) 65%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-160%);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-shell {
  width: var(--page);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 3.6rem;
  padding-inline: max(1rem, calc((100vw - 1240px) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in oklch, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 0.55rem;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.wordmark-mark {
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.65rem;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.site-header nav a {
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 650;
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--ink);
}

.method-badge {
  justify-self: end;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
  gap: 4rem;
  align-items: end;
  padding-block: 5.5rem 3.75rem;
}

.eyebrow,
.step-label {
  margin: 0 0 0.7rem;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 14ch;
  margin-bottom: 0;
  font-size: 3.35rem;
  font-weight: 760;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

h2 {
  margin-bottom: 0;
  font-size: 2rem;
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

h3 {
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.intro-copy {
  max-width: 46ch;
  margin-bottom: 0.2rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.calculator {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  align-items: start;
  min-height: calc(100vh - 4.6rem);
  margin-top: 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.control-panel {
  position: sticky;
  top: 4.1rem;
  min-width: 0;
  max-height: calc(100vh - 4.6rem);
  padding: 1.25rem 1.45rem 1.1rem;
  overflow-y: auto;
  border: 0;
  border-right: 1px solid var(--line);
  background: var(--paper-deep);
}

.panel-heading,
.section-heading-row,
.range-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
}

.panel-heading {
  align-items: center;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.panel-heading h3 {
  margin-bottom: 0;
  font-size: 1.45rem;
}

.panel-heading .step-label {
  margin-bottom: 0;
}

.text-button {
  padding: 0.5rem 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.25rem;
}

.text-button:hover {
  color: var(--ink);
}

.explorable-copy {
  /* padding-block: 1rem 0.8rem; */
}

.explorable-copy h2 {
  /* max-width: 13ch; */
  margin-bottom: 0.85rem;
  font-size: 1.65rem;
}

.explorable-copy > p {
  max-width: 40ch;
  margin-bottom: 0.75rem;
  font-family: var(--font-prose);
  font-size: 1rem;
  line-height: 1.58;
}

.inline-select-control,
.inline-range-control,
.inline-number-control {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  max-width: 100%;
  border-radius: 0.2rem;
  box-shadow: inset 0 -0.42em var(--blue-soft);
  color: var(--blue);
  font-family: var(--font-ui);
  font-size: 0.94em;
  font-weight: 720;
  line-height: 1.3;
  vertical-align: baseline;
  transition: box-shadow 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.inline-select-control:hover,
.inline-range-control:hover,
.inline-number-control:hover,
.inline-select-control:focus-within,
.inline-range-control:focus-within,
.inline-number-control:focus-within {
  box-shadow: inset 0 -1.6em var(--blue-soft);
}

.inline-select-control select {
  width: auto;
  max-width: 18rem;
  min-height: 0;
  padding: 0 1.1rem 0 0.18rem;
  border: 0;
  border-radius: 0;
  appearance: none;
  background: transparent;
  color: inherit;
  field-sizing: content;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}

.inline-select-control > span {
  position: absolute;
  right: 0.12rem;
  bottom: 0.2em;
  color: currentColor;
  font-family: var(--font-ui);
  font-size: 0.62em;
  pointer-events: none;
}

.inline-range-control {
  align-items: center;
  gap: 0.22rem;
  padding-inline: 0.18rem;
  cursor: ew-resize;
}

.inline-range-control output {
  font: inherit;
}

.inline-range-control input {
  position: absolute;
  inset: -0.25rem 0;
  width: 100%;
  height: calc(100% + 0.5rem);
  opacity: 0;
  cursor: ew-resize;
}

.inline-range-control > span {
  font-family: var(--font-mono);
  font-size: 0.72em;
}

.inline-number-control {
  gap: 0.28rem;
  padding-inline: 0.18rem;
  white-space: nowrap;
}

.inline-number-control input {
  width: 7ch;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: inherit;
  font-family: var(--font-mono);
  font-size: inherit;
  font-weight: 720;
  text-align: right;
}

.inline-number-control:has(#sequences-input) input {
  width: 3.5ch;
}

.inline-number-control > span:last-child {
  font-size: 0.88em;
}

.explorable-copy .explorable-thesis {
  margin-top: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.explorable-copy .model-context {
  min-height: 1rem;
  margin: 0;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  line-height: 1.5;
}

.field-stack {
  display: grid;
  gap: 1.25rem;
  padding-block: 1.75rem;
}

.field,
.mini-field {
  display: grid;
  gap: 0.45rem;
}

.field-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field-label,
.mini-field > span:first-child {
  color: var(--ink-soft);
  font-size: 0.73rem;
  font-weight: 720;
  letter-spacing: 0.025em;
}

.field-hint {
  min-height: 1.1rem;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

select,
.number-field {
  width: 100%;
  min-height: 2.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--paper) 78%, transparent);
}

select {
  padding: 0.55rem 2.2rem 0.55rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 620;
}

.number-field {
  display: flex;
  align-items: center;
  overflow: hidden;
}

.number-field input {
  min-width: 0;
  flex: 1;
  padding: 0.55rem 0.2rem 0.55rem 0.75rem;
  border: 0;
  outline: 0;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 620;
}

.number-field span {
  padding-inline: 0.65rem;
  color: var(--ink-faint);
  font-size: 0.68rem;
}

select:hover,
.number-field:hover,
.mini-field input:hover,
.storage-editor input:hover {
  border-color: var(--ink-soft);
}

.retention-field {
  gap: 0.75rem;
  padding-top: 0.3rem;
}

.range-heading {
  align-items: baseline;
}

.range-heading output {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 750;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

.range-scale {
  display: flex;
  justify-content: space-between;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.61rem;
}

.advanced {
  border-top: 1px solid var(--line);
}

.advanced summary,
.derivation-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
}

.advanced summary {
  padding-block: 0.65rem;
}

.advanced summary::-webkit-details-marker,
.derivation-list summary::-webkit-details-marker {
  display: none;
}

.advanced summary span:first-child {
  display: grid;
  gap: 0.12rem;
}

.advanced summary strong {
  font-size: 0.8rem;
}

.advanced summary small {
  color: var(--ink-faint);
  font-size: 0.67rem;
}

.summary-action {
  color: var(--blue);
  font-size: 0.73rem;
  font-weight: 700;
}

.advanced[open] .summary-action::before {
  content: "Close ";
}

.advanced[open] .summary-action {
  font-size: 0;
}

.advanced[open] .summary-action::before {
  font-size: 0.73rem;
}

.advanced-body {
  display: grid;
  gap: 1rem;
  padding-block: 0.4rem 0.8rem;
}

.advanced-section {
  display: grid;
  gap: 0.5rem;
}

.advanced-section h4 {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.compact-field {
  max-width: 16rem;
}

.assumption-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}

.mini-field {
  padding: 0.45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--paper) 70%, transparent);
}

.mini-field > span:last-child {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.66rem;
}

.mini-field input {
  min-width: 0;
  width: 4.5rem;
  padding: 0.2rem 0.25rem;
  border: 1px solid transparent;
  border-radius: 0.25rem;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
}

.storage-editor {
  display: grid;
  gap: 0.35rem;
  font-size: 0.7rem;
}

.storage-editor-head,
.storage-editor-row {
  display: grid;
  grid-template-columns: 0.55fr 1fr 1fr 1fr;
  gap: 0.4rem;
  align-items: center;
}

.storage-editor-head {
  color: var(--ink-faint);
  font-size: 0.61rem;
}

.storage-editor-row strong {
  font-family: var(--font-mono);
}

.storage-editor input {
  min-width: 0;
  width: 100%;
  padding: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  background: color-mix(in oklch, var(--paper) 80%, transparent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.result-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.25rem 1.45rem 1.1rem;
  background: var(--paper);
}

.result-heading {
  max-width: 42rem;
}

.result-heading .step-label {
  margin-bottom: 0.55rem;
}

.result-kicker {
  margin-bottom: 0.2rem;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

.result-heading h2 {
  /* max-width: 22ch; */
  font-size: 1.65rem;
  margin-bottom: 0.85rem;
}

.result-heading h2 span {
  color: var(--blue);
}

.result-heading > p:last-child {
  max-width: 58ch;
  margin: 0.45rem 0 0;
  color: var(--ink-soft);
  font-family: var(--font-prose);
  font-size: 0.88rem;
  line-height: 1.5;
}

.result-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0.85rem 0 0.9rem;
  border-block: 1px solid var(--line);
}

.result-facts div {
  min-width: 0;
  padding: 0.6rem 0.55rem 0.6rem 0;
}

.result-facts div + div {
  padding-left: 0.55rem;
  border-left: 1px solid var(--line);
}

.result-facts dt {
  margin-bottom: 0.18rem;
  color: var(--ink-faint);
  font-size: 0.6rem;
  font-weight: 700;
}

.result-facts dd {
  margin: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visualization-heading {
  margin-bottom: 0.55rem;
}

.visualization-heading h3 {
  margin-bottom: 0.2rem;
  font-size: 1rem;
}

.visualization-heading p {
  margin: 0;
  color: var(--ink-faint);
  font-size: 0.69rem;
  line-height: 1.45;
}

.ttl-visualization {
  min-width: 0;
}

.ttl-visualization .step-label {
  margin-bottom: 0.2rem;
  font-size: 0.58rem;
}

.current-cost-details {
  margin-top: 0.7rem;
  border-top: 1px solid var(--line);
}

.current-cost-details summary {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding-block: 0.65rem;
  cursor: pointer;
  list-style: none;
}

.current-cost-details summary::-webkit-details-marker {
  display: none;
}

.current-cost-details summary::before {
  color: var(--blue);
  content: "+";
  font-family: var(--font-mono);
}

.current-cost-details[open] summary::before {
  content: "−";
}

.current-cost-details summary > span {
  margin-right: auto;
  font-size: 0.72rem;
  font-weight: 720;
}

.current-cost-details summary small {
  color: var(--ink-faint);
  font-size: 0.6rem;
}

.current-cost-details summary strong {
  color: var(--ink-soft);
  font-family: var(--font-mono);
}

.strategy-table-wrap {
  overflow-x: auto;
}

.strategy-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.strategy-table caption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.strategy-table th,
.strategy-table td {
  padding: 0.5rem 0.4rem;
  border-bottom: 1px solid var(--line);
  text-align: right;
}

.strategy-table th {
  color: var(--ink-faint);
  font-size: 0.63rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.strategy-table th:first-child,
.strategy-table td:first-child {
  padding-left: 0.4rem;
  text-align: left;
}

.strategy-table tbody tr {
  transition: background-color 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.strategy-table tbody tr.is-winner {
  background: var(--blue-soft);
}

.strategy-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 720;
}

.strategy-dot {
  width: 0.58rem;
  height: 0.58rem;
  flex: 0 0 auto;
  border: 1px solid color-mix(in oklch, var(--ink) 20%, transparent);
  border-radius: 50%;
  background: var(--strategy-color);
}

.strategy-label small {
  display: block;
  color: var(--ink-faint);
  font-size: 0.62rem;
  font-weight: 500;
}

.winner-tag {
  margin-left: auto;
  padding: 0.16rem 0.4rem;
  border-radius: 999px;
  background: var(--blue);
  color: var(--paper);
  font-size: 0.55rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.unavailable-cell {
  color: var(--rust);
  font-family: var(--font-mono);
  font-size: 0.66rem;
}

.table-note {
  margin: 0.45rem 0 0;
  color: var(--ink-faint);
  font-size: 0.66rem;
}

.pipeline-section,
.methodology-section {
  padding-block: 3.75rem;
}

.pipeline-section {
  margin-top: 3.75rem;
  background: var(--paper-blue);
  box-shadow: inset 0 1px var(--line), inset 0 -1px var(--line);
}

.section-heading-row {
  align-items: end;
  margin-bottom: 1.75rem;
}

.section-heading-row > p {
  max-width: 43ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.calculation-trace {
  display: grid;
  gap: 0.85rem;
  max-width: 1180px;
}

.trace-column-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.trace-column-head span {
  padding: 0 0.75rem 0.4rem;
}

.trace-column-head span + span {
  border-left: 1px solid var(--line);
}

.formula-rows {
  border-block: 1px solid var(--line-strong);
  counter-reset: formula-step;
}

.formula-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  counter-increment: formula-step;
  border-bottom: 1px solid var(--line);
}

.formula-row:last-child {
  border-bottom: 0;
}

.formula-definition,
.formula-calculation {
  min-width: 0;
  padding: 0.52rem 0.75rem;
}

.formula-definition {
  position: relative;
  display: grid;
  grid-template-columns: minmax(9rem, 0.65fr) minmax(0, 1.35fr);
  gap: 0.75rem;
  padding-left: 2.5rem;
  border-right: 1px solid var(--line);
}

.formula-definition::before {
  position: absolute;
  top: 0.58rem;
  left: 0.7rem;
  color: var(--ink-faint);
  content: counter(formula-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.55rem;
}

.formula-name {
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 740;
  overflow-wrap: anywhere;
}

.formula-symbolic,
.formula-calculation code,
.formula-result {
  font-family: var(--font-mono);
}

.formula-symbolic {
  color: var(--ink-soft);
  font-size: 0.64rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
  white-space: normal;
}

.formula-calculation {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.18rem;
}

.formula-calculation code {
  color: var(--ink-soft);
  font-size: 0.64rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
  white-space: normal;
}

.formula-equals {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.65rem;
}

.formula-result-line {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.formula-result {
  color: var(--ink);
  font-size: 0.65rem;
  font-weight: 760;
  line-height: 1.4;
  text-align: left;
}

.trace-note {
  margin: 0.45rem 0.75rem 0;
  color: var(--ink-faint);
  font-size: 0.62rem;
  line-height: 1.45;
}

.strategy-trace-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.55rem 0.2rem 0.45rem;
  color: var(--ink-soft);
  font-size: 0.69rem;
}

.strategy-trace-heading strong {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.67rem;
}

.strategy-traces {
  border-top: 1px solid var(--line-strong);
}

.strategy-trace {
  border-bottom: 1px solid var(--line-strong);
}

.strategy-trace summary {
  display: grid;
  grid-template-columns: minmax(10rem, 1fr) auto minmax(7rem, auto);
  gap: 1rem;
  align-items: center;
  padding: 0.7rem 0.2rem;
  cursor: pointer;
  list-style: none;
}

.strategy-trace summary::-webkit-details-marker {
  display: none;
}

.strategy-trace summary::before {
  grid-column: 1;
  grid-row: 1;
  width: 0.45rem;
  color: var(--ink-faint);
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.strategy-trace[open] summary::before {
  content: "−";
}

.strategy-trace-identity {
  display: flex;
  grid-column: 1;
  grid-row: 1;
  gap: 0.65rem;
  align-items: center;
  padding-left: 1.2rem;
}

.strategy-trace-identity strong,
.strategy-trace-identity small {
  display: block;
}

.strategy-trace-identity strong {
  font-size: 0.86rem;
}

.strategy-trace-identity small {
  margin-top: 0.08rem;
  color: var(--ink-faint);
  font-size: 0.62rem;
}

.strategy-trace-status {
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.strategy-trace-status.is-winner {
  border-color: var(--blue);
  background: var(--blue);
  color: var(--paper);
}

.strategy-trace-total {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: right;
}

.strategy-trace-body {
  padding: 0 0 0.65rem 1.2rem;
}

.trace-decision {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.25rem 1.5rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: var(--paper);
}

.trace-decision span {
  color: color-mix(in oklch, var(--paper) 65%, transparent);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.trace-decision strong {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.92rem;
}

.trace-decision p {
  margin: 0;
  color: color-mix(in oklch, var(--paper) 78%, transparent);
  font-size: 0.7rem;
}

.chart-frame {
  min-width: 0;
  padding: 0.4rem 0.45rem 0.3rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--paper) 92%, transparent);
}
#crossover-title {
  margin-top: 0.4rem;
}
#crossover-chart {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.chart-grid {
  stroke: var(--line);
  stroke-width: 1;
}

.chart-axis {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.chart-label {
  fill: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 10px;
}

.chart-axis-title {
  fill: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 650;
}

.winner-range-band {
  opacity: 0.055;
}

.winner-range-label {
  fill: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
}

.chart-line {
  fill: none;
  stroke-width: 2.7;
  vector-effect: non-scaling-stroke;
}

.break-even-baseline {
  stroke: var(--rust);
  stroke-dasharray: 5 4;
  opacity: 0.72;
}

.break-even-marker {
  fill: var(--paper);
  stroke: var(--rust);
  stroke-width: 2;
}

.break-even-label,
.break-even-point-label {
  fill: var(--rust);
  font-size: 10px;
  font-weight: 700;
}

.latency-visualization {
  margin-top: 0.9rem;
}

.latency-visualization h4 {
  margin: 0.25rem 0 0.15rem;
}

.latency-label,
.latency-value {
  fill: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
}

.latency-bar {
  opacity: 0.8;
  rx: 3px;
}

.current-marker {
  stroke: var(--ink);
  stroke-dasharray: 3 4;
  stroke-width: 1.25;
}

.current-marker-label {
  fill: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}

.crossover-marker {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  padding: 0.25rem 0.3rem 0.1rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink-soft);
  font-size: 0.6rem;
}

.legend-line {
  width: 1.4rem;
  height: 0;
  border-top: 2px solid var(--legend-color);
}

.legend-line.dashed {
  border-top-style: dashed;
}

.crossover-notes {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 1rem;
  margin-top: 0.55rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line);
}

.crossover-notes h4 {
  margin-bottom: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.crossover-notes ol,
.crossover-notes ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.crossover-notes ol {
  counter-reset: path;
}

.crossover-notes ol li {
  display: grid;
  grid-template-columns: 1.25rem 1fr;
  gap: 0.45rem;
  padding-block: 0.4rem;
  border-top: 1px solid var(--line);
  counter-increment: path;
  font-size: 0.66rem;
}

.crossover-notes ol li::before {
  display: grid;
  place-items: center;
  width: 1.15rem;
  height: 1.15rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--ink-faint);
  content: counter(path, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.5rem;
}

.crossover-notes li strong {
  display: block;
}

.crossover-notes li small {
  color: var(--ink-faint);
}

.pairwise-block {
  margin-top: 0;
}

.pairwise-block h4 {
  margin-bottom: 0.35rem;
}

.pairwise-block li {
  padding-block: 0.28rem;
  color: var(--ink-soft);
  font-size: 0.62rem;
  line-height: 1.4;
}

.ttl-reading-note {
  margin: 0.55rem 0 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.63rem;
  line-height: 1.45;
}

.derivation-section {
  padding-block: 3.75rem;
  background: var(--ink);
  color: var(--paper);
}

.derivation-heading > p {
  color: color-mix(in oklch, var(--paper) 65%, transparent);
}

.derivation-section .step-label {
  color: oklch(76% 0.12 250);
}

.decision-equation {
  display: grid;
  grid-template-columns: repeat(7, auto);
  gap: 0.65rem;
  align-items: center;
  justify-content: center;
  margin-block: 2rem;
  padding: 1rem;
  border: 1px solid color-mix(in oklch, var(--paper) 35%, transparent);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-align: center;
}

.decision-equation strong {
  color: oklch(78% 0.12 250);
  font-size: 1.55rem;
}

.derivation-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.principle-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.principle-card,
.decision-rule-card {
  min-width: 0;
  padding: 1rem 1.1rem;
  border: 1px solid color-mix(in oklch, var(--paper) 22%, transparent);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--paper) 3%, transparent);
}

.principle-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
}

.principle-card p,
.decision-rule-card p {
  margin: 0.55rem 0;
  color: color-mix(in oklch, var(--paper) 78%, transparent);
}

.principle-card pre,
.decision-rule-card pre {
  margin: 0.65rem 0;
  padding: 0.75rem 0.85rem;
  overflow-x: auto;
  border-left: 3px solid oklch(76% 0.12 250);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--paper) 5%, transparent);
}

.principle-card code,
.decision-rule-card code {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: pre;
}

.decision-rule-card {
  margin-top: 0.85rem;
}

.derivation-list details {
  border: 1px solid color-mix(in oklch, var(--paper) 22%, transparent);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--paper) 3%, transparent);
}

.derivation-list summary {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  min-height: 3.3rem;
}

.derivation-list summary > span {
  color: oklch(76% 0.12 250);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.derivation-list summary strong {
  font-size: 0.95rem;
}

.derivation-list summary small {
  color: color-mix(in oklch, var(--paper) 55%, transparent);
  font-size: 0.7rem;
  font-weight: 500;
}

.derivation-list summary::after {
  grid-column: 4;
  color: color-mix(in oklch, var(--paper) 55%, transparent);
  content: "+";
  font-family: var(--font-mono);
}

.derivation-list details[open] summary::after {
  content: "−";
}

.derivation-body {
  max-width: none;
  padding: 0.25rem 1rem 1rem 3rem;
  color: color-mix(in oklch, var(--paper) 78%, transparent);
  font-size: 0.84rem;
}

.formula {
  overflow-wrap: anywhere;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.87rem;
  line-height: 1.55;
}

.substitution {
  padding: 0.75rem 0.9rem;
  border: 1px solid color-mix(in oklch, var(--paper) 18%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--paper) 5%, transparent);
  color: oklch(80% 0.06 250);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.architecture-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 0.75rem 0 0;
}

.architecture-facts div {
  padding: 0.5rem;
  border: 1px solid color-mix(in oklch, var(--paper) 15%, transparent);
  border-radius: var(--radius-sm);
}

.architecture-facts dt {
  color: color-mix(in oklch, var(--paper) 55%, transparent);
  font-size: 0.62rem;
}

.architecture-facts dd {
  margin: 0.25rem 0 0;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

.methodology-section {
  padding-bottom: 3rem;
}

.methodology-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.methodology-grid article {
  min-height: 8rem;
  padding: 1rem 1rem 1rem 0;
}

.methodology-grid article:nth-child(3n + 2),
.methodology-grid article:nth-child(3n + 3) {
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}

.methodology-grid article:nth-child(n + 4) {
  border-top: 1px solid var(--line);
}

.methodology-grid h3 {
  margin-bottom: 0.7rem;
  font-size: 0.9rem;
}

.methodology-grid p {
  max-width: 38ch;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.77rem;
}

.sources-block {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.sources-block h3 {
  font-size: 0.9rem;
}

.sources-block ul {
  max-width: 75ch;
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.sources-block li + li {
  margin-top: 0.65rem;
}

.sources-block a {
  color: var(--blue);
}

.source-caveat {
  grid-column: 2;
  max-width: 75ch;
  margin: 0.5rem 0 0;
  color: var(--rust);
  font-size: 0.73rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2rem;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.68rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  :root {
    --page: min(100% - 2rem, 760px);
  }

  .site-header {
    grid-template-columns: 1fr auto;
    padding-inline: 1rem;
  }

  .site-header nav {
    display: none;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .calculator {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .control-panel {
    position: static;
    max-height: none;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

}

@media (max-width: 700px) {
  :root {
    --page: calc(100% - 1.25rem);
  }

  .method-badge,
  .wordmark > span:last-child {
    display: none;
  }

  .site-header {
    min-height: 3.4rem;
  }

  .intro {
    padding-block: 3.8rem 2.5rem;
  }

  h1 {
    font-size: 2.55rem;
  }

  /* h2 {
    font-size: 1.65rem;
  } */

  .calculator {
    border-radius: var(--radius-md);
  }

  .control-panel,
  .result-panel {
    padding: 1rem;
  }

  .calculator {
    margin-top: 1rem;
  }

  .explorable-copy h1 {
    margin-bottom: 0.8rem;
    font-size: 2rem;
  }

  .explorable-copy > p {
    max-width: none;
    font-size: 0.98rem;
  }

  .inline-select-control select {
    max-width: 13rem;
  }

  .field-pair,
  .assumption-grid {
    grid-template-columns: 1fr;
  }

  .storage-editor-head {
    display: none;
  }

  .storage-editor-row {
    grid-template-columns: 0.45fr repeat(3, 1fr);
  }

  .result-heading h2 {
    font-size: 1.55rem;
  }

  .result-facts {
    grid-template-columns: 1fr 1fr;
  }

  .result-facts div:nth-child(3) {
    border-left: 0;
  }

  .result-facts div:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .pipeline-section,
  .methodology-section,
  .derivation-section {
    padding-block: 2.75rem;
  }

  .pipeline-section {
    margin-top: 2.75rem;
  }

  .section-heading-row {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.4rem;
  }

  .calculation-trace {
    gap: 0.8rem;
  }

  .trace-column-head {
    display: none;
  }

  .formula-row {
    grid-template-columns: 1fr;
  }

  .formula-definition {
    grid-template-columns: 1fr;
    gap: 0.2rem;
    padding: 0.5rem 0.65rem 0.45rem 2.3rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .formula-calculation {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 0.5rem 0.65rem;
  }

  .formula-calculation code {
    grid-column: 1 / -1;
  }

  .formula-result {
    justify-self: end;
  }

  .strategy-trace-heading {
    display: grid;
    gap: 0.2rem;
  }

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

  .strategy-trace-status {
    display: none;
  }

  .strategy-trace-total {
    grid-column: 2;
  }

  .strategy-trace-body {
    padding-left: 0;
  }

  .trace-decision {
    grid-template-columns: 1fr;
  }

  .trace-decision strong {
    grid-column: 1;
    grid-row: auto;
    margin-top: 0.35rem;
  }

  .crossover-notes {
    grid-template-columns: 1fr;
  }

  .current-cost-details summary {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .current-cost-details summary small {
    flex-basis: 100%;
    padding-left: 1rem;
  }

  .decision-equation {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .derivation-list summary {
    grid-template-columns: 1.7rem 1fr auto;
  }

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

  .principle-cards {
    grid-template-columns: 1fr;
  }

  .derivation-list summary small {
    display: none;
  }

  .derivation-list summary::after {
    grid-column: 3;
  }

  .derivation-body {
    padding-left: 1.7rem;
  }

  .architecture-facts {
    grid-template-columns: 1fr 1fr;
  }

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

  .methodology-grid article,
  .methodology-grid article:nth-child(3n + 2),
  .methodology-grid article:nth-child(3n + 3) {
    min-height: auto;
    padding: 1.2rem 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .methodology-grid article:first-child {
    border-top: 0;
  }

  .sources-block {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .source-caveat {
    grid-column: 1;
  }

  .site-footer {
    display: grid;
  }
}

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