:root {
  color-scheme: light dark;
  --canvas: #f4f1e8;
  --surface: #fffdf7;
  --surface-strong: #ffffff;
  --ink: #1c2927;
  --muted: #596964;
  --faint: #5f6d68;
  --line: #c7cec7;
  --line-strong: #8f9d97;
  --measure: #075c52;
  --measure-dark: #03453e;
  --measure-soft: #dcece7;
  --caution: #e7bd45;
  --caution-soft: #fff2c7;
  --danger: #9d3b31;
  --danger-soft: #fae4df;
  --focus: #006fba;
  --page: 76rem;
  --reading: 72ch;
  --radius-sm: 3px;
  --radius: 8px;
  --space-1: 0.35rem;
  --space-2: 0.65rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --space-6: 3.5rem;
  --font-sans: "BIZ UDPGothic", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #101816;
    --surface: #17211f;
    --surface-strong: #1d2926;
    --ink: #eef5f1;
    --muted: #bbc9c3;
    --faint: #9eadA7;
    --line: #40504b;
    --line-strong: #71817b;
    --measure: #71c7b8;
    --measure-dark: #9addd1;
    --measure-soft: #173b35;
    --caution: #f0ca59;
    --caution-soft: #453916;
    --danger: #ff9f91;
    --danger-soft: #49231f;
    --focus: #71c8ff;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: 0.28rem;
  background: var(--measure);
  z-index: 30;
}

button,
input,
select {
  font: inherit;
}

button,
select,
input {
  color: inherit;
}

a {
  color: var(--measure-dark);
  text-underline-offset: 0.22em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  text-decoration-thickness: 0.14em;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

.skip-link {
  position: fixed;
  inset: 0.75rem auto auto 0.75rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--surface-strong);
  border: 2px solid var(--ink);
  transform: translateY(-160%);
}

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

.boundary-strip {
  background: var(--ink);
  color: var(--surface);
  font-size: 0.82rem;
  line-height: 1.45;
}

.boundary-strip__inner,
.site-header__inner,
.site-nav__inner,
.page-shell,
.site-footer__inner {
  width: min(calc(100% - 2rem), var(--page));
  margin-inline: auto;
}

.boundary-strip__inner {
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.4rem;
}

.boundary-strip a {
  color: inherit;
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.site-header {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  min-height: 4.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.75rem;
  text-decoration: none;
}

.brand__mark {
  position: relative;
  width: 2.65rem;
  height: 2.65rem;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--surface);
  color: var(--measure-dark);
  font-weight: 800;
  line-height: 1;
}

.brand__mark::before,
.brand__mark::after {
  content: "";
  position: absolute;
  z-index: 0;
  background: var(--line);
  pointer-events: none;
}

.brand__mark::before {
  inset: 0 auto 0 50%;
  width: 1px;
}

.brand__mark::after {
  inset: 50% 0 auto;
  height: 1px;
}

.brand__text {
  display: grid;
  line-height: 1.25;
}

.brand__text strong {
  font-size: 0.96rem;
  letter-spacing: 0.02em;
}

.brand__text small {
  color: var(--muted);
  font-size: 0.75rem;
}

.site-header__status {
  color: var(--muted);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--line-strong);
  overflow-x: auto;
  scrollbar-width: thin;
}

.site-nav__inner {
  display: flex;
  align-items: stretch;
  gap: 0;
  padding-block: 0.3rem;
}

.site-nav a {
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: 0.9rem;
  border-right: 1px solid var(--line);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:first-child {
  border-left: 1px solid var(--line);
}

.site-nav a[aria-current="page"] {
  background: var(--measure-soft);
  border-bottom: 3px solid var(--measure);
}

.page-shell {
  padding-block: var(--space-5) var(--space-6);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.93fr) minmax(28rem, 1.07fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: end;
  min-height: 30rem;
  padding-block: clamp(1rem, 4vw, 3.5rem);
}

.hero__copy {
  align-self: center;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--measure-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2.5rem;
  margin-right: 0.7rem;
  border-top: 3px solid var(--caution);
  vertical-align: 0.25em;
}

h1,
h2,
h3 {
  line-height: 1.28;
  text-wrap: balance;
}

h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(2.25rem, 5.4vw, 4.8rem);
  letter-spacing: -0.04em;
}

.hero__lead {
  max-width: 43rem;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.14rem);
}

.hero__limits {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--faint);
  font-size: 0.78rem;
}

.hero__limits li::before {
  content: "—";
  margin-right: 0.35rem;
}

.situation-panel {
  border-top: 5px solid var(--ink);
  background: var(--surface);
}

.situation-panel__head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.9rem 1rem;
  border-inline: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.situation-panel__head h2 {
  margin: 0;
  font-size: 1rem;
}

.situation-panel__head span {
  color: var(--faint);
  font: 0.72rem/1.2 var(--font-mono);
}

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

.situation-help {
  min-height: 44px;
  padding: 0.7rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border-inline: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  color: var(--measure-dark);
  font-weight: 800;
  text-decoration: none;
}

.situation-help::after {
  content: "→";
  font-size: 1.1rem;
}

.situation-help:hover {
  background: var(--measure-soft);
}

.situation-panel__note {
  margin: 0;
  padding: 0.65rem 1rem;
  border-inline: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  color: var(--faint);
  font-size: 0.74rem;
}

.situation-choice {
  min-height: 8.25rem;
  padding: 1rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-content: center;
  text-align: left;
  background: var(--surface);
  border: 0;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  cursor: pointer;
}

.situation-choice:hover,
.situation-choice[aria-pressed="true"] {
  background: var(--measure-soft);
}

.situation-choice[aria-pressed="true"] {
  border-left: 4px solid var(--measure);
}

.situation-choice__code {
  color: var(--measure-dark);
  font: 800 0.76rem/1 var(--font-mono);
}

.situation-choice__body {
  display: grid;
  gap: 0.2rem;
}

.situation-choice__body strong {
  line-height: 1.35;
}

.situation-choice__body small {
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.45;
}

.situation-choice__arrow {
  align-self: center;
  font-size: 1.2rem;
}

.section {
  margin-top: clamp(3.5rem, 8vw, 7rem);
}

.section-heading {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  max-width: var(--reading);
  margin-bottom: 1.75rem;
}

.section-heading__number {
  padding-top: 0.35rem;
  border-top: 3px solid var(--caution);
  color: var(--measure-dark);
  font: 800 0.78rem/1 var(--font-mono);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.7rem);
}

.section-heading p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.measure-tape {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  border-block: 1px solid var(--line-strong);
  background: var(--surface);
}

.measure-tape li {
  min-height: 3.7rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.8rem;
  border-right: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
}

.measure-tape li:last-child {
  border-right: 0;
}

.measure-tape b {
  color: var(--measure-dark);
  font: 800 0.74rem/1 var(--font-mono);
}

.worksheet {
  background: var(--surface);
  border: 1px solid var(--line-strong);
}

.worksheet__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: start;
  padding: 1.25rem;
  border-bottom: 1px solid var(--line-strong);
}

.worksheet__intro h3 {
  margin: 0;
  font-size: 1.25rem;
}

.worksheet__intro p {
  max-width: 65ch;
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.local-only {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--measure);
  color: var(--measure-dark);
  font: 700 0.72rem/1.3 var(--font-mono);
  white-space: nowrap;
}

.worksheet__selection {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--line-strong);
  background: var(--measure-soft);
}

.worksheet__selection > span {
  color: var(--measure-dark);
  font: 800 0.74rem/1.6 var(--font-mono);
}

.worksheet__selection strong {
  display: block;
}

.worksheet__selection p {
  max-width: 66ch;
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

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

.field-group {
  min-width: 0;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.field-group:nth-child(even) {
  border-right: 0;
}

.field-group h3,
.field-group legend {
  margin: 0 0 0.75rem;
  font-weight: 800;
}

.field-group legend {
  padding: 0;
}

.field-group p {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.83rem;
}

fieldset.field-group {
  margin: 0;
  border-top: 0;
  border-left: 0;
}

.field {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.85rem;
}

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

.component-list {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
}

.component-row {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr) minmax(8rem, 0.72fr);
  gap: 0.65rem;
  align-items: end;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line);
}

.component-row__number {
  align-self: center;
  color: var(--measure-dark);
  font: 800 0.7rem/1.3 var(--font-mono);
}

.component-row .field {
  margin-top: 0;
}

.field-group > small {
  display: block;
  margin-top: 0.75rem;
  color: var(--faint);
  font-size: 0.75rem;
  line-height: 1.55;
}

.field label,
.field__label {
  font-size: 0.84rem;
  font-weight: 700;
}

.field small {
  color: var(--faint);
  font-size: 0.75rem;
}

.field input,
.field select {
  width: 100%;
  min-height: 3rem;
  padding: 0.55rem 0.7rem;
  background: var(--surface-strong);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.field input[aria-invalid="true"],
.field select[aria-invalid="true"] {
  border: 2px solid var(--danger);
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.check-row {
  min-height: 3rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  cursor: pointer;
}

.check-row input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--measure);
}

.worksheet__actions,
.output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--line-strong);
}

.button {
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  border: 2px solid var(--measure-dark);
  border-radius: var(--radius-sm);
  background: var(--measure-dark);
  color: var(--surface);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  filter: brightness(1.08);
}

.button--secondary {
  background: var(--surface);
  color: var(--measure-dark);
}

.button--quiet {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--ink);
}

.worksheet-status {
  min-height: 1.5rem;
  margin: 0;
  padding: 0 1.25rem 1rem;
  color: var(--danger);
  font-weight: 700;
}

.worksheet-output {
  margin-top: 1rem;
  border: 2px solid var(--ink);
  background: var(--surface);
}

.worksheet-output[hidden] {
  display: none;
}

.worksheet-output__head {
  padding: 1.25rem;
  border-bottom: 1px solid var(--line-strong);
  background: var(--measure-soft);
}

.worksheet-output__head h3 {
  margin: 0;
}

.worksheet-output__head p {
  max-width: var(--reading);
  margin: 0.45rem 0 0;
}

.memo {
  margin: 0;
  padding: 1.25rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 0.9rem/1.7 var(--font-mono);
}

.output-next {
  padding: 1.1rem 1.25rem;
  border-top: 1px solid var(--line-strong);
  background: var(--surface);
}

.output-next h4 {
  margin: 0;
  font-size: 1rem;
}

.output-next ol {
  margin: 0.65rem 0 0;
  padding-left: 1.4rem;
}

.output-next li + li {
  margin-top: 0.35rem;
}

.output-next a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  font-weight: 750;
}

.output-next p {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.clipboard-note {
  margin: 0;
  padding: 0 1.25rem 1rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.caution-note,
.emergency-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--caution) 70%, var(--line));
  border-left: 5px solid var(--caution);
  background: var(--caution-soft);
}

.caution-note strong,
.emergency-note strong {
  display: block;
}

.caution-note p,
.emergency-note p {
  margin: 0;
}

.emergency-note {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.emergency-note__code {
  color: var(--danger);
  font: 800 0.74rem/1.3 var(--font-mono);
}

.source-list,
.comparison-list,
.step-list,
.faq-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.source-group + .source-group {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.source-group-title {
  margin-bottom: 0.4rem;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.source-group > p {
  max-width: 68ch;
}

.source-card {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr) minmax(14rem, 0.6fr);
  gap: 1.25rem;
  padding: 1.25rem;
  border-top: 1px solid var(--line-strong);
  background: var(--surface);
}

.source-card:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.source-card__code {
  color: var(--measure-dark);
  font: 800 0.76rem/1.4 var(--font-mono);
}

.source-card h3,
.source-card h4 {
  margin: 0;
  font-size: 1.05rem;
}

.source-card p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.source-card__action {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
}

.source-card__action a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  font-weight: 800;
}

.source-card__action small {
  color: var(--faint);
  font: 0.7rem/1.4 var(--font-mono);
}

.article-hero {
  max-width: 62rem;
  padding-block: clamp(1.5rem, 5vw, 4.5rem);
}

.article-hero h1 {
  max-width: 18ch;
  font-size: clamp(2.15rem, 5vw, 4.3rem);
}

.article-hero__lead {
  max-width: 58rem;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--faint);
  font: 0.74rem/1.5 var(--font-mono);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(12rem, 15rem) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.toc {
  position: sticky;
  top: 1rem;
  padding: 1rem;
  border-top: 4px solid var(--ink);
  background: var(--surface);
}

.toc strong {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 0.8rem;
}

.toc a {
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  text-decoration: none;
}

.article-body {
  min-width: 0;
  max-width: var(--reading);
}

.article-body > section {
  scroll-margin-top: 1rem;
  margin-bottom: var(--space-6);
}

.article-body h2 {
  margin: 0 0 1rem;
  padding-top: 0.65rem;
  border-top: 4px solid var(--ink);
  font-size: clamp(1.45rem, 2.5vw, 2.2rem);
}

.article-body h3 {
  margin: 1.7rem 0 0.65rem;
  font-size: 1.15rem;
}

.article-body p,
.article-body li {
  max-width: 68ch;
}

.comparison-list li,
.step-list li {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-strong);
}

.comparison-list b,
.step-list b {
  color: var(--measure-dark);
  font: 800 0.78rem/1.5 var(--font-mono);
}

.faq-list details {
  border-top: 1px solid var(--line-strong);
  background: var(--surface);
}

.faq-list details:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.faq-list summary {
  min-height: 3.5rem;
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  font-weight: 800;
  cursor: pointer;
}

.faq-list details p {
  margin: 0;
  padding: 0 1rem 1rem;
  color: var(--muted);
}

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

.policy-grid section {
  padding: 1.25rem;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--surface);
}

.policy-grid h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.policy-grid p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  border-top: 4px solid var(--ink);
  background: var(--surface);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  padding-block: 2rem;
}

.site-footer p {
  max-width: 58rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.25rem 1rem;
}

.site-footer nav a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
}

.not-found {
  min-height: 62vh;
  display: grid;
  place-items: center;
  text-align: center;
}

.not-found h1 {
  max-width: none;
}

.not-found p {
  max-width: 42rem;
}

@media (max-width: 58rem) {
  .hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    min-height: auto;
  }

  .hero__copy {
    max-width: 48rem;
  }

  .source-card {
    grid-template-columns: 5rem minmax(0, 1fr);
  }

  .source-card__action {
    grid-column: 2;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 0.6rem;
  }

  .toc strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 40rem) {
  body {
    background-size: 100% 2.5rem;
  }

  .boundary-strip__inner,
  .site-header__inner,
  .site-nav__inner,
  .page-shell,
  .site-footer__inner {
    width: min(calc(100% - 1.25rem), var(--page));
  }

  .boundary-strip__inner {
    min-height: 2.65rem;
    font-size: 0.72rem;
  }

  .boundary-strip__inner span {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .boundary-strip a {
    display: none;
  }

  .site-header__inner {
    min-height: 3.7rem;
  }

  .brand__mark {
    width: 2.25rem;
    height: 2.25rem;
  }

  .brand__text strong {
    font-size: 0.81rem;
  }

  .brand__text small,
  .site-header__status {
    display: none;
  }

  .site-nav__inner {
    width: min(calc(100% - 1.25rem), var(--page));
    margin-inline: 0.625rem;
    padding-block: 0.28rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .site-nav a {
    min-height: 2.75rem;
    padding: 0.3rem 0.45rem;
    justify-content: center;
    text-align: center;
    font-size: 0.78rem;
    line-height: 1.35;
    white-space: normal;
  }

  .site-nav a:nth-child(3n + 1) {
    border-left: 1px solid var(--line);
  }

  .site-nav a:nth-child(-n + 3) {
    border-bottom: 1px solid var(--line);
  }

  .page-shell {
    padding-block: 0.75rem 3rem;
  }

  .hero {
    display: block;
    padding-block: 0.25rem 0;
  }

  .eyebrow {
    margin-bottom: 0.35rem;
    font-size: 0.68rem;
  }

  .eyebrow::before {
    width: 1.75rem;
    margin-right: 0.45rem;
  }

  h1 {
    max-width: 12ch;
    font-size: clamp(2rem, 11vw, 2.65rem);
    line-height: 1.15;
  }

  .hero__lead {
    margin-top: 0.65rem;
    font-size: 0.86rem;
    line-height: 1.55;
  }

  .hero__limits {
    display: none;
  }

  .situation-panel {
    margin-top: 0.85rem;
  }

  .situation-panel__head {
    padding: 0.45rem 0.65rem;
  }

  .situation-panel__head h2 {
    font-size: 0.88rem;
  }

  .situation-grid {
    gap: 0;
  }

  .situation-choice {
    min-height: 5.05rem;
    padding: 0.55rem;
    grid-template-columns: auto 1fr;
    gap: 0.4rem;
  }

  .situation-choice__body strong {
    font-size: 0.8rem;
  }

  .situation-choice__body small {
    font-size: 0.66rem;
    line-height: 1.32;
  }

  .situation-choice__arrow {
    display: none;
  }

  .situation-help {
    padding: 0.5rem 0.65rem;
    font-size: 0.74rem;
  }

  .situation-panel__note {
    padding: 0.45rem 0.65rem;
    font-size: 0.66rem;
    line-height: 1.35;
  }

  .section {
    margin-top: 3rem;
  }

  .section-heading {
    grid-template-columns: 2.6rem minmax(0, 1fr);
    gap: 0.65rem;
    margin-bottom: 1rem;
  }

  .section-heading h2 {
    font-size: 1.45rem;
  }

  .section-heading p {
    font-size: 0.86rem;
  }

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

  .measure-tape li:nth-child(2) {
    border-right: 0;
  }

  .measure-tape li:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .worksheet__intro,
  .worksheet__selection,
  .worksheet__grid,
  .policy-grid,
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .worksheet__intro {
    gap: 0.8rem;
  }

  .local-only {
    justify-self: start;
  }

  .field-group,
  .field-group:nth-child(even) {
    border-right: 0;
  }

  .compact-fields,
  .component-row {
    grid-template-columns: 1fr;
  }

  .component-row__number {
    margin-bottom: -0.15rem;
  }

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

  .source-card {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .source-card__action {
    grid-column: auto;
  }

  .article-hero {
    padding-block: 1rem 2rem;
  }

  .article-hero h1 {
    max-width: 14ch;
  }

  .article-hero__lead {
    font-size: 0.96rem;
  }

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

  .comparison-list li,
  .step-list li {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.65rem;
  }

  .site-footer nav {
    justify-content: flex-start;
  }
}

@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;
  }
}

@media print {
  @page {
    size: A4;
    margin: 12mm;
  }

  :root {
    color-scheme: light;
    --canvas: #ffffff;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --ink: #000000;
    --muted: #222222;
    --faint: #333333;
    --line: #999999;
    --line-strong: #555555;
    --measure: #000000;
    --measure-dark: #000000;
    --measure-soft: #ffffff;
  }

  body {
    background: #ffffff;
    font-size: 10pt;
  }

  body::before,
  .skip-link,
  .boundary-strip,
  .site-header,
  .site-nav,
  .hero,
  .section-heading,
  .measure-tape,
  .worksheet,
  .site-footer,
  .output-next,
  .output-actions,
  .clipboard-note {
    display: none !important;
  }

  .page-shell,
  .section {
    width: 100%;
    margin: 0;
    padding: 0;
  }

  .page-shell > * {
    display: none !important;
  }

  .page-shell > #worksheet,
  #worksheet > .worksheet-output {
    display: block !important;
  }

  #worksheet > *:not(.worksheet-output) {
    display: none !important;
  }

  .worksheet-output {
    margin: 0;
    border: 1.5pt solid #000;
    break-inside: avoid;
  }

  .worksheet-output__head,
  .memo {
    padding: 10pt;
  }

  a {
    color: #000;
  }
}