:root {
  color-scheme: light dark;
  --background: #f7f8fa;
  --surface: #ffffff;
  --surface-muted: #eef2f3;
  --text: #17202a;
  --muted: #566572;
  --border: #d5dde2;
  --accent: #176b5b;
  --accent-strong: #0d5145;
  --accent-soft: #e1f0ec;
  --focus: #126fbb;
  --max-width: 72rem;
  --measure: 62rem;
  --radius: 0.75rem;
  --shadow: 0 0.8rem 2.2rem rgb(23 32 42 / 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

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

a:hover {
  text-decoration-thickness: 0.15em;
}

a:focus-visible {
  border-radius: 0.15rem;
  outline: 0.2rem solid var(--focus);
  outline-offset: 0.2rem;
}

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

h1,
h2,
h3 {
  color: var(--text);
  line-height: 1.15;
}

h1 {
  max-width: 17ch;
  margin-bottom: 1.5rem;
  font-size: clamp(2.5rem, 7vw, 5rem);
  letter-spacing: -0.045em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.65rem);
  letter-spacing: -0.025em;
}

h3 {
  font-size: 1.25rem;
}

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

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

.prose {
  max-width: 68ch;
}

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

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 20;
  padding: 0.6rem 0.9rem;
  background: var(--surface);
  transform: translateY(-160%);
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--background);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.header-inner {
  min-height: 4.75rem;
}

.wordmark {
  color: var(--text);
  font-weight: 780;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.nav-list,
.footer-links,
.badge-row,
.actions,
.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: inline-block;
  padding: 0.25rem 0;
  border-bottom: 0.15rem solid transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

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

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

.page-hero {
  border-bottom: 1px solid var(--border);
  padding-block: clamp(3.5rem, 8vw, 6rem);
  background: var(--surface);
}

.page-hero h1 {
  max-width: 20ch;
  font-size: clamp(2.4rem, 6vw, 4.25rem);
}

.lede {
  max-width: 68ch;
  margin-bottom: 1.75rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.28rem);
}

.eyebrow,
.label,
.disclosure-item dt {
  margin-bottom: 0.65rem;
  color: var(--accent-strong);
  font-size: 0.77rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.breadcrumbs {
  margin-bottom: 1.4rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: 0.4rem;
  color: var(--border);
  content: "/";
}

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

.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(--surface-muted);
}

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

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

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(20rem, 1.15fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

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

.card,
.principle-card,
.disclosure-item,
.callout {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.card,
.principle-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: clamp(1.25rem, 3vw, 1.6rem);
}

.card {
  min-height: 100%;
  box-shadow: var(--shadow);
}

.card h3,
.principle-card h3 {
  margin: 1.25rem 0 0.75rem;
}

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

.card p,
.principle-card p {
  color: var(--muted);
}

.card-link {
  margin-top: auto;
  padding-top: 1rem;
  font-weight: 700;
}

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

.badge-row {
  gap: 0.45rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 680;
  line-height: 1.2;
}

.badge-status {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.section-action {
  margin: 1.5rem 0 0;
  font-weight: 700;
}

.actions {
  align-items: center;
  gap: 1rem 1.4rem;
}

.button {
  display: inline-block;
  padding: 0.65rem 1rem;
  border: 1px solid var(--accent-strong);
  border-radius: 0.45rem;
  background: var(--accent-strong);
  color: #ffffff;
  font-weight: 730;
  text-decoration: none;
}

.button:hover {
  background: var(--accent);
}

.text-link {
  font-weight: 700;
}

.callout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(1.5rem, 5vw, 3rem);
}

.callout h2 {
  margin-bottom: 0;
}

.detail-summary {
  margin-top: 2rem;
}

.disclosure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 0;
}

.disclosure-item {
  padding: 1.15rem;
}

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

.disclosure-item dd {
  color: var(--text);
  font-weight: 620;
}

.disclosure-item dd small {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.87rem;
  font-weight: 450;
  line-height: 1.5;
}

.content-sections {
  display: grid;
  gap: 2.5rem;
}

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

.content-section h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.content-section h3 {
  margin-top: 1.75rem;
}

.content-section li + li {
  margin-top: 0.55rem;
}

.notice {
  max-width: 72ch;
  padding: 1.15rem 1.25rem;
  border-left: 0.25rem solid var(--accent);
  background: var(--accent-soft);
}

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

.link-list {
  gap: 0.6rem 1.25rem;
}

.link-list a {
  font-weight: 650;
}

.site-footer {
  padding-block: 2.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

.error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 1rem;
}

.error-card {
  width: min(100%, 34rem);
  padding: clamp(2rem, 7vw, 4rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.error-card h1 {
  font-size: clamp(2.2rem, 7vw, 3.5rem);
}

@media (max-width: 52rem) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-inner {
    padding-block: 1rem;
  }

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

  .nav-list {
    gap-inline: 0.9rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #101416;
    --surface: #171d20;
    --surface-muted: #13191c;
    --text: #edf2f4;
    --muted: #acb8be;
    --border: #344148;
    --accent: #67c7b3;
    --accent-strong: #8bd8c8;
    --accent-soft: #173d36;
    --focus: #7ac8ff;
    --shadow: 0 0.8rem 2.2rem rgb(0 0 0 / 0.18);
  }
}

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