@charset "UTF-8";

:root {
  color-scheme: light dark;
  --paper: #f4efe3;
  --paper-raised: #fffaf0;
  --paper-deep: #e9e0cf;
  --ink: #173f35;
  --ink-soft: #45645b;
  --ink-faint: #6c7d76;
  --orange: #ef6a3a;
  --orange-dark: #bd4b24;
  --orange-pale: #f8d8c7;
  --line: #cec3af;
  --line-strong: #9caa9f;
  --white: #fffdf7;
  --danger: #a52d1b;
  --brand-fixed: #173f35;
  --brand-paper-fixed: #f7f0e2;
  --shadow: 0.45rem 0.45rem 0 rgba(23, 63, 53, 0.13);
  --radius: 0.25rem;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --content-width: 74rem;
  --reading-width: 46rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  min-width: 20rem;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

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

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

button,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--orange-dark);
}

p,
h1,
h2,
h3,
ul,
ol,
dl {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-weight: 850;
  letter-spacing: -0.045em;
  line-height: 1.17;
}

h1 {
  font-size: clamp(2.4rem, 10vw, 5.8rem);
}

h2 {
  font-size: clamp(1.75rem, 5vw, 3rem);
}

h3 {
  font-size: 1.2rem;
}

::selection {
  background: var(--orange);
  color: #171d1a;
}

:focus-visible {
  border-radius: 0.1rem;
  outline: 0.2rem solid var(--orange);
  outline-offset: 0.22rem;
}

[hidden] {
  display: none !important;
}

.page-shell {
  width: min(calc(100% - 2rem), var(--content-width));
  margin-inline: auto;
}

.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;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 1rem;
  transform: translateY(-180%);
  background: var(--white);
  color: var(--brand-fixed);
  font-weight: 800;
}

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

.eyebrow,
.card-eyebrow,
.section-index,
.step-label,
.note-label {
  margin-bottom: 0.65rem;
  color: var(--orange-dark);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow--light {
  color: #ff9a70;
}

.site-header {
  position: relative;
  z-index: 50;
  border-bottom: 0.25rem solid var(--orange);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  min-height: 4.75rem;
  gap: 1rem;
}

.brand {
  display: inline-block;
  width: min(13.15rem, 65vw);
}

.brand:hover {
  opacity: 0.88;
}

.menu-toggle {
  display: none;
  width: 2.9rem;
  height: 2.9rem;
  padding: 0.65rem;
  border: 1px solid rgba(247, 240, 226, 0.45);
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.menu-toggle > span:not(.visually-hidden) {
  display: block;
  height: 2px;
  margin: 0.28rem 0;
  background: currentColor;
}

.js .menu-toggle {
  display: block;
}

.site-nav {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  padding: 0 0 1rem;
  font-size: 0.93rem;
  font-weight: 720;
}

.js .site-nav:not([data-open="true"]) {
  display: none;
}

.site-nav a {
  padding: 0.45rem 0;
  color: inherit;
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: #ff9a70;
  text-decoration: underline;
  text-underline-offset: 0.38rem;
}

.breadcrumbs {
  padding-block: 1rem 0;
  font-size: 0.78rem;
  color: var(--ink-faint);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-left: 0.45rem;
  color: var(--orange);
}

.breadcrumbs a {
  color: inherit;
}

.home-hero {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  gap: 2rem;
  padding-block: clamp(3.5rem, 10vw, 7.5rem);
}

.hero-copy h1 {
  max-width: 12ch;
  margin-bottom: 1.4rem;
}

.hero-copy h1 em {
  color: var(--orange-dark);
  font-style: normal;
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.12em;
}

.hero-lead {
  max-width: 39rem;
  margin-bottom: 1.7rem;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.hero-detail,
.privacy-note,
.card-meta,
.footer-note {
  color: var(--ink-faint);
  font-size: 0.82rem;
}

.button-row,
.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.15rem;
  border: 2px solid var(--ink);
  border-radius: 0;
  font-weight: 820;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.button--primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper-raised);
  box-shadow: 0.3rem 0.3rem 0 var(--orange);
}

.button--primary:hover {
  background: var(--orange-dark);
  border-color: var(--orange-dark);
  color: #fff;
}

.button--secondary {
  background: transparent;
  color: var(--ink);
}

.button--secondary:hover {
  background: var(--paper-deep);
}

.button--text {
  min-height: auto;
  padding-inline: 0;
  border: 0;
}

.button--paper {
  border-color: var(--brand-paper-fixed);
  background: var(--brand-paper-fixed);
  color: var(--brand-fixed);
}

.measure-note {
  position: relative;
  align-self: start;
  padding: 2rem 1.35rem 1.35rem;
  border: 2px solid var(--ink);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.measure-rule {
  position: absolute;
  inset: 0 0 auto;
  display: flex;
  justify-content: space-between;
  height: 1.15rem;
  padding: 0.12rem 0.6rem 0;
  border-bottom: 1px solid var(--line);
  background: repeating-linear-gradient(90deg, transparent 0 0.55rem, var(--ink) 0.55rem 0.6rem);
  font-size: 0.54rem;
}

.note-quote {
  margin-block: 1.4rem 2.5rem;
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 850;
  letter-spacing: -0.04em;
  line-height: 1.3;
}

.measure-note dl {
  margin: 0;
  border-top: 1px solid var(--line);
}

.measure-note dl div {
  display: flex;
  justify-content: space-between;
  padding-block: 0.45rem;
  border-bottom: 1px solid var(--line);
}

.measure-note dt {
  color: var(--ink-faint);
  font-size: 0.76rem;
}

.measure-note dd {
  margin: 0;
  font-size: 0.84rem;
  font-weight: 800;
}

.section {
  padding-block: clamp(3.75rem, 9vw, 7rem);
}

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

.section-heading {
  margin-bottom: 2rem;
}

.section-heading h2 {
  margin-bottom: 0;
}

.split-heading > p,
.split-heading > a {
  max-width: 32rem;
}

.tool-grid,
.guide-grid,
.principle-grid {
  display: grid;
  gap: 1rem;
}

.tool-card {
  position: relative;
  min-height: 19rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-top: 0.32rem solid var(--ink);
  background: var(--paper-raised);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.tool-card:hover {
  transform: translate(-0.2rem, -0.2rem);
  box-shadow: var(--shadow);
}

.tool-card:nth-child(3n + 2) {
  border-top-color: var(--orange);
}

.tool-card h3 {
  max-width: 15ch;
  margin-block: 2.2rem 0.9rem;
  font-size: 1.45rem;
}

.tool-card h3 a {
  text-decoration: none;
}

.tool-card h3 a::after {
  position: absolute;
  inset: 0;
  content: '';
}

.tool-card p:not(.card-number, .card-eyebrow) {
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.card-number {
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  color: var(--line);
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 1;
}

.card-link {
  position: absolute;
  bottom: 1.25rem;
  left: 1.4rem;
  color: var(--orange-dark);
  font-size: 0.85rem;
  font-weight: 850;
}

.workflow-section,
.related-section {
  padding-block: clamp(3.75rem, 8vw, 6rem);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.workflow-list {
  padding: 0;
  border-top: 1px solid rgba(247, 240, 226, 0.32);
  list-style: none;
}

.workflow-list li {
  display: grid;
  grid-template-columns: 2.7rem 1fr;
  gap: 1rem;
  padding-block: 1.4rem;
  border-bottom: 1px solid rgba(247, 240, 226, 0.32);
}

.workflow-list li > span {
  color: #ff9a70;
  font-size: 1.4rem;
  font-weight: 900;
}

.workflow-list h3 {
  margin-bottom: 0.35rem;
}

.workflow-list p {
  margin: 0;
  color: #cbd8d3;
}

.principle-grid article {
  padding: 1.4rem 0;
  border-top: 2px solid var(--ink);
}

.principle-grid article > span {
  display: inline-grid;
  width: 2.2rem;
  height: 2.2rem;
  place-items: center;
  margin-bottom: 2rem;
  background: var(--orange-pale);
  color: var(--orange-dark);
  font-weight: 900;
}

.principle-grid p {
  margin: 0;
  color: var(--ink-soft);
}

.text-link {
  font-weight: 820;
}

.guide-card {
  position: relative;
  padding: 1.4rem 0;
  border-top: 1px solid var(--line-strong);
}

.guide-card h3 {
  margin-bottom: 0.7rem;
  font-size: 1.35rem;
}

.guide-card h3 a {
  text-decoration-color: var(--orange);
}

.guide-card > p:not(.card-eyebrow, .card-meta) {
  color: var(--ink-soft);
}

.related-section .guide-card {
  border-color: rgba(247, 240, 226, 0.42);
}

.related-section .guide-card > p:not(.card-eyebrow, .card-meta),
.related-section .card-meta {
  color: #cbd8d3;
}

.narrow-section {
  width: min(calc(100% - 2rem), var(--reading-width));
  margin-inline: auto;
}

.faq-list {
  border-top: 2px solid var(--ink);
}

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

.faq-list summary {
  position: relative;
  padding: 1.25rem 2.5rem 1.25rem 0;
  font-weight: 820;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  position: absolute;
  top: 1.15rem;
  right: 0.2rem;
  color: var(--orange-dark);
  content: '+';
  font-size: 1.5rem;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: '−';
}

.faq-list details p {
  padding: 0 2.5rem 1.4rem 0;
  color: var(--ink-soft);
}

.page-intro {
  padding-block: clamp(3.5rem, 9vw, 7rem) 2.5rem;
  border-bottom: 1px solid var(--line);
}

.page-intro h1 {
  max-width: 13ch;
  margin-bottom: 1.25rem;
  font-size: clamp(2.7rem, 9vw, 5.4rem);
}

.page-intro > p:last-child {
  max-width: 42rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.preflight,
.guide-index-note {
  display: grid;
  gap: 1.5rem;
  margin-bottom: clamp(4rem, 10vw, 7rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.preflight h2,
.guide-index-note h2 {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
}

.preflight ul {
  margin: 0;
  padding-left: 1.3rem;
  color: #d7dfda;
}

.preflight .button {
  align-self: center;
  justify-self: start;
}

.guide-grid--index .guide-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-top: 0.28rem solid var(--orange);
  background: var(--paper-raised);
}

.guide-index-note > p:last-child {
  max-width: 48rem;
  margin: 0;
  color: #d7dfda;
}

.calculator-intro {
  display: grid;
  gap: 2rem;
  padding-block: clamp(2.5rem, 8vw, 5rem);
}

.calculator-intro h1 {
  max-width: 13ch;
  margin-bottom: 1rem;
  font-size: clamp(2.5rem, 8vw, 4.8rem);
}

.calculator-intro > div > p:last-child {
  max-width: 44rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.article-meta {
  align-self: end;
  margin: 0;
  border-top: 2px solid var(--ink);
}

.article-meta div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.55rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
}

.article-meta dt {
  color: var(--ink-faint);
}

.article-meta dd {
  margin: 0;
  font-weight: 750;
  text-align: right;
}

.calculator-workbench {
  padding-block: clamp(2rem, 5vw, 4rem);
  border-block: 1px solid var(--line);
  background: var(--paper-deep);
}

.workbench-inner {
  display: grid;
  gap: 1rem;
}

.form-panel,
.result-panel {
  padding: clamp(1.25rem, 4vw, 2.2rem);
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

.result-panel {
  align-self: stretch;
  border-color: var(--ink);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.panel-heading {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.result-panel .panel-heading {
  border-color: rgba(247, 240, 226, 0.35);
}

.panel-heading h2 {
  margin-bottom: 0.45rem;
  font-size: 1.7rem;
}

.panel-heading p:last-child {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.field-grid {
  display: grid;
  gap: 1rem;
}

.form-field label {
  display: inline-block;
  margin-bottom: 0.38rem;
  font-size: 0.9rem;
  font-weight: 800;
}

.form-field input,
.form-field select {
  width: 100%;
  min-height: 3.1rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--white);
  color: #173f35;
}

.form-field input {
  padding: 0.62rem 3.8rem 0.62rem 0.8rem;
}

.form-field select {
  padding: 0.62rem 0.8rem;
}

.form-field input:hover,
.form-field select:hover {
  border-color: var(--ink);
}

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

.input-with-unit {
  position: relative;
}

.input-with-unit > span {
  position: absolute;
  top: 50%;
  right: 0.8rem;
  transform: translateY(-50%);
  color: #5e716a;
  font-size: 0.78rem;
  font-weight: 750;
  pointer-events: none;
}

.field-hint,
.field-error {
  margin: 0.35rem 0 0;
  font-size: 0.76rem;
  line-height: 1.5;
}

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

.field-error,
.form-message {
  color: var(--danger);
  font-weight: 750;
}

.form-field--checkbox {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0.65rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
}

.form-field--checkbox input {
  width: 1.25rem;
  height: 1.25rem;
  min-height: auto;
  margin: 0.2rem 0 0;
  accent-color: var(--orange-dark);
}

.form-field--checkbox label {
  margin: 0;
}

.form-field--checkbox .field-error {
  grid-column: 1 / -1;
}

.form-actions {
  margin-block: 1.5rem 0.6rem;
}

.form-message {
  padding: 0.75rem;
  border-left: 0.25rem solid var(--danger);
  background: color-mix(in srgb, var(--danger) 9%, transparent);
}

.action-status {
  min-height: 1.5em;
  margin: 0.5rem 0 0;
  color: var(--orange-dark);
  font-size: 0.82rem;
  font-weight: 800;
}

.result-summary {
  margin-bottom: 1.4rem;
  color: #fff;
  font-size: 1.16rem;
  font-weight: 780;
}

.result-list {
  margin-bottom: 1.5rem;
  border-top: 1px solid rgba(247, 240, 226, 0.35);
}

.result-list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.7rem;
  border-bottom: 1px solid rgba(247, 240, 226, 0.25);
}

.result-list dt {
  color: #cbd8d3;
  font-size: 0.8rem;
}

.result-list dd {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 850;
  text-align: right;
}

.result-list__primary dd {
  color: #ff9a70;
  font-size: clamp(1.35rem, 5vw, 2rem);
}

.article-layout {
  display: grid;
  gap: 2rem;
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.article-main {
  min-width: 0;
}

.content-section {
  margin-bottom: clamp(3.5rem, 8vw, 5.5rem);
}

.content-section h2 {
  max-width: 18ch;
  margin-bottom: 1.5rem;
}

.content-section > p:not(.section-index) {
  max-width: var(--reading-width);
  color: var(--ink-soft);
}

.formula-list {
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
  counter-reset: formula;
  list-style: none;
}

.formula-list li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.5rem;
  padding-block: 0.95rem;
  border-bottom: 1px solid var(--line);
  counter-increment: formula;
  font-weight: 720;
}

.formula-list li::before {
  color: var(--orange-dark);
  content: counter(formula, decimal-leading-zero);
  font-size: 0.76rem;
  font-weight: 900;
}

.example-box {
  padding: clamp(1.3rem, 4vw, 2.2rem);
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.example-box dl {
  margin: 0;
}

.example-box dl div {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.8rem;
  padding-block: 0.75rem;
  border-top: 1px solid var(--line);
}

.example-box dt {
  color: var(--orange-dark);
  font-size: 0.8rem;
  font-weight: 850;
}

.example-box dd {
  margin: 0;
}

.numbered-steps {
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
  list-style: none;
}

.numbered-steps li {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.8rem;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.numbered-steps li > span {
  color: var(--orange-dark);
  font-weight: 900;
}

.numbered-steps h3 {
  margin-bottom: 0.35rem;
}

.numbered-steps p {
  margin: 0;
  color: var(--ink-soft);
}

.cautions ul,
.plain-list {
  padding: 1.2rem 1.2rem 1.2rem 2.4rem;
  border-left: 0.35rem solid var(--orange);
  background: var(--paper-deep);
}

.cautions li + li,
.plain-list li + li {
  margin-top: 0.55rem;
}

.notice {
  margin-block: 2.5rem;
  padding: 1.2rem;
  border: 1px solid var(--line-strong);
}

.notice strong {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--orange-dark);
}

.notice p {
  margin: 0;
}

.notice--important {
  border-left: 0.4rem solid var(--orange);
  background: var(--paper-raised);
}

.article-aside {
  min-width: 0;
}

.sticky-note,
.sticky-tools {
  padding: 1.25rem;
  border-top: 0.3rem solid var(--orange);
  background: var(--paper-deep);
}

.sticky-note strong {
  display: block;
  margin-bottom: 0.8rem;
  font-size: 1.25rem;
}

.sticky-note ul {
  padding-left: 1.2rem;
  font-size: 0.88rem;
}

.sticky-note a {
  font-size: 0.86rem;
  font-weight: 820;
}

.article-hero {
  padding-block: clamp(3.5rem, 9vw, 7rem);
  border-bottom: 1px solid var(--line);
}

.article-hero h1 {
  max-width: 14ch;
  margin-bottom: 1.4rem;
  font-size: clamp(2.5rem, 8vw, 5rem);
}

.article-lead {
  max-width: 43rem;
  margin-bottom: 1.6rem;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2.5vw, 1.28rem);
}

.byline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  color: var(--ink-faint);
  font-size: 0.78rem;
}

.detail-list {
  display: grid;
  gap: 0;
  max-width: var(--reading-width);
  margin-top: 1.5rem;
  padding: 0;
  border-top: 2px solid var(--ink);
  list-style: none;
}

.detail-list li {
  display: grid;
  gap: 0.25rem;
  padding-block: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.detail-list strong {
  color: var(--orange-dark);
}

.detail-list span {
  color: var(--ink-soft);
}

.checklist {
  margin-block: 2rem 4rem;
  padding: clamp(1.3rem, 4vw, 2.2rem);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.checklist h2 {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
}

.checklist ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  display: grid;
  grid-template-columns: 1.2rem 1fr;
  gap: 0.7rem;
  padding-block: 0.65rem;
  border-top: 1px solid rgba(247, 240, 226, 0.27);
}

.checklist li > span {
  width: 1rem;
  height: 1rem;
  margin-top: 0.3rem;
  border: 2px solid #ff9a70;
}

.sticky-tools h2 {
  margin-bottom: 1rem;
  font-size: 1.35rem;
}

.sticky-tools ul {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.sticky-tools a {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.1rem 0.7rem;
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.sticky-tools a span:first-child {
  grid-column: 1;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

.sticky-tools a strong {
  grid-column: 1;
  font-size: 0.88rem;
}

.sticky-tools a span:last-child {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
  color: var(--orange-dark);
}

.info-article {
  padding-bottom: clamp(4rem, 10vw, 7rem);
}

.article-hero--compact {
  padding-inline: 0;
}

.article-hero--compact h1 {
  max-width: 16ch;
}

.info-content {
  width: min(100%, var(--reading-width));
  margin-top: clamp(3rem, 8vw, 5rem);
}

.contact-card {
  margin-top: 2.5rem;
  padding: clamp(1.4rem, 5vw, 2.5rem);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.contact-card h2 {
  font-size: clamp(1.35rem, 5vw, 2.2rem);
}

.contact-card p:last-child {
  margin: 0;
  color: #cbd8d3;
}

.not-found {
  min-height: 65vh;
  padding-block: clamp(4rem, 12vw, 8rem);
}

.not-found-mark {
  color: var(--line);
  font-size: clamp(6rem, 30vw, 18rem);
  font-weight: 950;
  letter-spacing: -0.12em;
  line-height: 0.7;
}

.not-found h1 {
  margin-block: 2rem 1rem;
  font-size: clamp(2.6rem, 9vw, 5rem);
}

.not-found > p:not(.eyebrow) {
  max-width: 38rem;
  color: var(--ink-soft);
}

.site-footer {
  padding-block: 3.5rem 1.4rem;
  border-top: 0.35rem solid var(--orange);
  background: var(--brand-fixed);
  color: var(--brand-paper-fixed);
}

.footer-grid {
  display: grid;
  gap: 2.4rem;
}

.footer-brand {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-size: 1.45rem;
  font-weight: 900;
  text-decoration: none;
}

.footer-grid > div > p:not(.footer-note) {
  color: #d7dfda;
}

.site-footer .footer-note {
  max-width: 30rem;
  color: #aebfb8;
}

.site-footer nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
}

.site-footer nav h2 {
  margin-bottom: 0.5rem;
  color: #ff9a70;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.site-footer nav a {
  color: inherit;
  font-size: 0.86rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-top: 2.5rem;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(247, 240, 226, 0.25);
  color: #aebfb8;
  font-size: 0.75rem;
}

.footer-bottom p {
  margin: 0;
}

@media (min-width: 38rem) {
  .page-shell {
    width: min(calc(100% - 3rem), var(--content-width));
  }

  .field-grid,
  .tool-grid,
  .guide-grid,
  .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-card {
    min-height: 20rem;
  }

  .detail-list li {
    grid-template-columns: 8rem 1fr;
    gap: 1rem;
  }

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

@media (min-width: 50rem) {
  .header-inner {
    grid-template-columns: auto 1fr;
    min-height: 5.25rem;
  }

  .js .menu-toggle {
    display: none;
  }

  .site-nav,
  .js .site-nav:not([data-open="true"]) {
    grid-column: auto;
    display: flex;
    justify-content: flex-end;
    padding: 0;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(17rem, 0.75fr);
    align-items: center;
    gap: clamp(3rem, 8vw, 7rem);
  }

  .split-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 2rem;
  }

  .split-heading > p,
  .split-heading > a {
    margin-bottom: 0.35rem;
  }

  .workflow-list li {
    grid-template-columns: 4rem 15rem 1fr;
  }

  .workflow-list li > span {
    grid-column: 1;
  }

  .workflow-list li > div {
    display: grid;
    grid-column: 2 / -1;
    grid-template-columns: 15rem 1fr;
    gap: 2rem;
  }

  .preflight {
    grid-template-columns: minmax(14rem, 0.8fr) minmax(18rem, 1fr) auto;
    align-items: center;
  }

  .calculator-intro {
    grid-template-columns: minmax(0, 1.5fr) minmax(16rem, 0.65fr);
    align-items: end;
  }

  .workbench-inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(19rem, 0.75fr);
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) minmax(13rem, 16rem);
    gap: clamp(3rem, 8vw, 7rem);
  }

  .sticky-note,
  .sticky-tools {
    position: sticky;
    top: 1.5rem;
  }
}

@media (min-width: 68rem) {
  .tool-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .guide-grid,
  .principle-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .guide-grid--index .guide-card:first-child {
    grid-column: span 2;
  }

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

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #13221e;
    --paper-raised: #1b2d27;
    --paper-deep: #20352e;
    --ink: #f2eadc;
    --ink-soft: #c7d3ce;
    --ink-faint: #9fb1aa;
    --orange: #ff8152;
    --orange-dark: #ff9a70;
    --orange-pale: #4d3025;
    --line: #40564e;
    --line-strong: #6d8078;
    --white: #f8f1e5;
    --danger: #ff9b88;
    --shadow: 0.45rem 0.45rem 0 rgba(255, 129, 82, 0.18);
  }

  .measure-rule {
    background: repeating-linear-gradient(90deg, transparent 0 0.55rem, var(--ink) 0.55rem 0.6rem);
  }

  .form-field input,
  .form-field select {
    background: #f8f1e5;
    color: #173f35;
  }

  .button--primary {
    color: #fffaf0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}