:root {
  color-scheme: light dark;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.35rem;
  --line-height-tight: 1;
  --line-height-heading: 1.12;
  --line-height-body: 1.65;
  --line-height-control: 1.35;
  --letter-spacing-heading: -0.035em;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-heavy: 800;
  --bg-primary: #f7f7f5;
  --bg-secondary: #ffffff;
  --bg-subtle: #efefec;
  --text-primary: #171816;
  --text-secondary: #62645f;
  --text-inverse: #ffffff;
  --border: #dcded8;
  --border-strong: #bfc2ba;
  --accent: #176b4d;
  --accent-strong: #0f563c;
  --accent-soft: #e3f1eb;
  --focus: #1673c9;
  --status-muted: #74766f;
  --shadow-sm: 0 1px 2px rgb(23 24 22 / 5%);
  --shadow-card: 0 1.2rem 3rem rgb(23 24 22 / 6%);
  --radius-sm: 0.4rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.15rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --content-width: 72rem;
  --reading-width: 43rem;
  --transition-fast: 150ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  overflow-wrap: break-word;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  text-rendering: optimizeLegibility;
  word-break: normal;
}

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

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: currentColor;
  text-decoration-thickness: 0.12em;
}

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

::selection {
  background: var(--accent-soft);
}

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

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

h1,
h2,
h3 {
  color: var(--text-primary);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
}

h1 {
  max-width: 15ch;
  margin-bottom: var(--space-5);
  font-size: clamp(2.65rem, 8vw, 5.8rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h3 {
  font-size: var(--font-size-lg);
  letter-spacing: -0.015em;
}

html:lang(ko) {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --line-height-heading: 1.2;
  --line-height-body: 1.7;
  --letter-spacing-heading: -0.02em;
}

html:lang(ja) {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, "Noto Sans JP", sans-serif;
  --line-height-heading: 1.2;
  --line-height-body: 1.7;
  --letter-spacing-heading: -0.02em;
  line-break: strict;
}

html:lang(ko) :is(h1, h2, h3, .eyebrow, .lede, .card p, .principle-card p, .section-heading > p, .button, .badge, .disclosure-item dt, .disclosure-item dd) {
  word-break: keep-all;
}

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

.measure,
.prose {
  max-width: var(--reading-width);
}

.prose > :last-child,
.card > :last-child,
.principle-card > :last-child,
.disclosure-item > :last-child,
.content-section > :last-child,
.error-card > :last-child {
  margin-bottom: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-2) var(--space-4);
  transform: translateY(-200%);
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--bg-primary);
}

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

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-primary) 94%, transparent);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.header-inner {
  min-height: 4.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.025em;
  text-decoration: none;
  white-space: nowrap;
}

.wordmark::before {
  width: 0.75rem;
  height: 0.75rem;
  flex: 0 0 auto;
  border: 3px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--accent-soft);
  content: "";
}

.nav-list,
.footer-links,
.badge-row,
.actions,
.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a,
.footer-links a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-control);
  text-decoration: none;
}

.nav-list a:hover,
.nav-list a[aria-current="page"],
.wordmark[aria-current="page"],
.footer-links a:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.hero,
.page-hero {
  padding-block: clamp(4.5rem, 11vw, 8rem);
}

.hero {
  min-height: min(45rem, calc(100vh - 4.5rem));
  display: grid;
  align-items: center;
}

.hero .measure {
  position: relative;
  max-width: 58rem;
}

.hero h1 {
  max-width: 12ch;
}

.hero .measure::after {
  position: absolute;
  top: -1.5rem;
  right: 0;
  width: clamp(4rem, 9vw, 7rem);
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: inset 0 0 0 1.5rem var(--accent-soft), inset 0 0 0 1.85rem var(--bg-secondary), inset 0 0 0 2.25rem var(--accent);
  content: "";
}

.page-hero {
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.page-hero h1 {
  max-width: 19ch;
  font-size: clamp(2.5rem, 7vw, 4.75rem);
}

.lede {
  max-width: 42rem;
  margin-bottom: var(--space-6);
  color: var(--text-secondary);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.eyebrow,
.label,
.disclosure-item dt {
  margin-bottom: var(--space-3);
  color: var(--accent);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.13em;
  line-height: var(--line-height-control);
  text-transform: uppercase;
}

.breadcrumbs {
  margin-bottom: var(--space-6);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: var(--space-2);
  color: var(--border-strong);
  content: "/";
}

.breadcrumbs [aria-current="page"] {
  color: var(--text-primary);
}

.section {
  padding-block: clamp(3.75rem, 8vw, 6.5rem);
  border-top: 1px solid var(--border);
}

.page-hero + .section {
  border-top: 0;
}

.section-tinted {
  background: var(--bg-subtle);
}

.section-heading {
  margin-bottom: var(--space-7);
}

.section-heading > :last-child {
  margin-bottom: 0;
  color: var(--text-secondary);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(20rem, 1.2fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.split-layout > *,
.callout > *,
.card-grid > *,
.principle-grid > *,
.disclosure-grid > * {
  min-width: 0;
}

.card-grid,
.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.card,
.principle-card,
.disclosure-item,
.callout {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
}

.card,
.principle-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-5);
}

.card {
  min-height: 16rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.principle-card {
  min-height: 13rem;
  border-radius: var(--radius-md);
  box-shadow: none;
}

.card h3,
.principle-card h3 {
  margin: var(--space-6) 0 var(--space-3);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
}

.card h3 a {
  color: var(--text-primary);
}

.card p,
.principle-card p,
.prose,
.content-section > p,
.content-section > ul {
  color: var(--text-secondary);
}

.card-link {
  margin-top: auto;
  padding-top: var(--space-5);
  font-weight: var(--font-weight-bold);
}

.featured-card {
  width: 100%;
  max-width: 38rem;
}

.badge-row {
  gap: var(--space-2);
}

.badge {
  display: inline-flex;
  min-height: 1.75rem;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
}

.badge-status {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.04em;
  line-height: var(--line-height-control);
  text-transform: uppercase;
}

.section-action {
  margin: var(--space-6) 0 0;
  font-weight: var(--font-weight-bold);
}

.actions {
  align-items: center;
  gap: var(--space-3) var(--space-5);
}

.button {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.65rem var(--space-4);
  border: 1px solid var(--text-primary);
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-control);
  text-align: center;
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.button:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: var(--text-inverse);
}

.text-link,
.link-list a {
  font-weight: var(--font-weight-bold);
  text-decoration-color: var(--border-strong);
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.text-link:hover,
.link-list a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.callout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
  gap: clamp(2rem, 6vw, 5rem);
  padding: clamp(1.5rem, 5vw, 3rem);
}

.callout h2 {
  margin-bottom: 0;
}

.detail-summary {
  margin-top: var(--space-6);
}

.disclosure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin: 0;
}

.disclosure-item {
  min-height: 9.5rem;
  padding: var(--space-5);
  border-radius: var(--radius-md);
}

.disclosure-item dt,
.disclosure-item dd {
  margin-left: 0;
}

.disclosure-item dd {
  color: var(--text-primary);
  font-weight: var(--font-weight-normal);
}

.disclosure-item dd small {
  display: block;
  margin-top: var(--space-2);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
}

.content-sections {
  display: grid;
  gap: var(--space-7);
}

.content-section {
  max-width: 72ch;
}

.content-section h2 {
  margin-bottom: var(--space-4);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

.content-section h3 {
  margin-top: var(--space-6);
}

.content-section li + li {
  margin-top: var(--space-2);
}

.notice {
  max-width: 72ch;
  padding: var(--space-5);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-left: 0.3rem solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--accent-soft);
  color: var(--text-secondary);
}

.notice strong {
  color: var(--text-primary);
}

.link-list {
  gap: var(--space-3) var(--space-6);
}

.site-footer {
  padding-block: var(--space-7);
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.site-footer p {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
}

.site-footer p::before {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  content: "";
}

.error-page {
  display: grid;
  min-height: 68vh;
  place-items: center;
  padding: var(--space-4);
}

.error-card {
  width: min(100%, 38rem);
  padding: clamp(2rem, 7vw, 4.5rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-card);
}

.error-card h1 {
  font-size: clamp(2.4rem, 7vw, 4rem);
}

@media (max-width: 68rem) {
  .disclosure-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero .measure::after {
    opacity: 0.7;
  }
}

@media (max-width: 52rem) {
  :root {
    --space-7: 2.5rem;
    --space-8: 3.5rem;
  }

  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-3);
  }

  .header-inner {
    padding-block: var(--space-3);
  }

  .header-inner nav {
    width: 100%;
    padding-top: var(--space-2);
    border-top: 1px solid var(--border);
  }

  .nav-list {
    gap: var(--space-1) var(--space-4);
  }

  .split-layout,
  .callout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

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

  .hero .measure::after {
    display: none;
  }
}

@media (max-width: 38rem) {
  .container {
    width: min(calc(100% - 1.5rem), var(--content-width));
  }

  .card-grid,
  .principle-grid,
  .disclosure-grid {
    grid-template-columns: 1fr;
  }

  .card,
  .principle-card,
  .disclosure-item {
    min-height: auto;
  }

  .actions .button {
    width: 100%;
  }

  .footer-links {
    gap-inline: var(--space-4);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #111210;
    --bg-secondary: #181a17;
    --bg-subtle: #20221e;
    --text-primary: #f0f1ed;
    --text-secondary: #aaada5;
    --text-inverse: #111210;
    --border: #343730;
    --border-strong: #4b5046;
    --accent: #65c69c;
    --accent-strong: #88d8b5;
    --accent-soft: #19372b;
    --focus: #66b5ff;
    --status-muted: #9b9e96;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 20%);
    --shadow-card: 0 1.2rem 3rem rgb(0 0 0 / 24%);
  }
}

@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;
  }

  .card:hover {
    transform: none;
  }
}