:root {
  color-scheme: light;
  --ink: #16231f;
  --muted: #56635f;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --line: #d9e0db;
  --brand: #075e54;
  --brand-dark: #06463f;
  --accent: #e3a72f;
  --accent-soft: #fff3d5;
  --focus: #0068d9;
  --max: 72rem;
  --measure: 44rem;
  font-family: "Hiragino Sans", "Yu Gothic", "YuGothic", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.8;
}

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

a {
  color: var(--brand);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  color: var(--brand-dark);
  text-decoration-thickness: 0.14em;
}

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 1rem;
  border-radius: 0.35rem;
  background: var(--ink);
  color: #fff;
  transform: translateY(-180%);
}

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

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.96);
}

.header-inner,
.footer-inner,
.shell {
  width: min(calc(100% - 2rem), var(--max));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border-radius: 0.7rem 0.2rem 0.7rem 0.2rem;
  background: var(--brand);
  color: #fff;
  font-size: 0.83rem;
  letter-spacing: -0.04em;
}

.site-nav ul {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: 1.3rem;
  list-style: none;
}

.site-nav a {
  color: var(--ink);
  font-size: 0.93rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 0.35rem;
}

main {
  min-height: 62vh;
}

.hero {
  padding: clamp(3.2rem, 8vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 84% 20%, rgba(227, 167, 47, 0.2), transparent 24rem),
    linear-gradient(135deg, #eef7f1, var(--paper) 58%);
}

.hero-grid {
  display: grid;
  align-items: end;
  gap: clamp(2rem, 6vw, 5rem);
  grid-template-columns: minmax(0, 1.35fr) minmax(17rem, 0.65fr);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.35;
  text-wrap: balance;
}

h1 {
  max-width: 17em;
  font-size: clamp(2rem, 5vw, 4.25rem);
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.15rem;
}

.hero-copy {
  max-width: 38rem;
  margin: 1.5rem 0 0;
  color: #34413d;
  font-size: clamp(1.02rem, 2vw, 1.22rem);
}

.hero-note {
  padding: 1.3rem 1.4rem;
  border: 1px solid #b7cec2;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.78);
}

.hero-note strong {
  display: block;
  margin-bottom: 0.35rem;
}

.hero-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.section {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
}

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

.section-heading {
  display: flex;
  margin-bottom: 2rem;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading p {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
}

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

.article-card,
.category-card {
  display: flex;
  min-height: 100%;
  padding: 1.35rem;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(22, 35, 31, 0.04);
}

.article-card h3,
.category-card h3 {
  margin-top: 0.55rem;
}

.article-card h3 a,
.category-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.article-card p,
.category-card p {
  margin: 0.8rem 0 1rem;
  color: var(--muted);
  font-size: 0.93rem;
}

.article-card .card-link,
.category-card .card-link {
  margin-top: auto;
  font-size: 0.9rem;
  font-weight: 800;
}

.chip {
  align-self: flex-start;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: #e7f2ec;
  color: var(--brand-dark);
  font-size: 0.74rem;
  font-weight: 800;
}

.principles {
  display: grid;
  margin: 2.5rem 0 0;
  padding: 0;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  list-style: none;
}

.principles li {
  padding: 1.25rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.principles strong {
  display: block;
  margin-bottom: 0.25rem;
}

.page-header {
  padding: clamp(2.8rem, 6vw, 5rem) 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background: #f0f6f2;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.page-header .lede {
  max-width: 44rem;
  margin: 1rem 0 0;
  color: var(--muted);
}

.breadcrumbs {
  margin: 0 0 1rem;
  padding: 0;
  color: var(--muted);
  font-size: 0.82rem;
  list-style: none;
}

.breadcrumbs li {
  display: inline;
}

.breadcrumbs li + li::before {
  margin: 0 0.45rem;
  content: "/";
}

.article-layout {
  display: grid;
  padding: clamp(2.5rem, 6vw, 5rem) 0;
  align-items: start;
  gap: clamp(2rem, 5vw, 4rem);
  grid-template-columns: minmax(0, var(--measure)) minmax(13rem, 1fr);
}

.article-meta {
  display: flex;
  margin: 1.1rem 0 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  color: var(--muted);
  font-size: 0.85rem;
  list-style: none;
}

.article-body {
  font-size: 1.03rem;
}

.article-body > p:first-of-type {
  font-size: 1.12rem;
}

.article-body h2 {
  margin-top: 3.4rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

.article-body p {
  margin: 1.1rem 0 0;
}

.article-body ul,
.article-body ol {
  margin: 1.1rem 0 0;
  padding-left: 1.4rem;
}

.article-body li + li {
  margin-top: 0.4rem;
}

.checklist {
  padding: 1.2rem 1.2rem 1.2rem 2.6rem !important;
  border: 1px solid #c8d8ce;
  border-radius: 0.7rem;
  background: #f1f8f4;
  list-style: "✓  ";
}

.article-aside {
  position: sticky;
  top: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--surface);
}

.article-aside h2 {
  font-size: 1rem;
}

.article-aside ol {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
  font-size: 0.84rem;
  line-height: 1.6;
}

.article-aside li + li {
  margin-top: 0.5rem;
}

.disclosure-note {
  margin: 2.5rem 0 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  font-size: 0.9rem;
}

.prose {
  width: min(calc(100% - 2rem), var(--measure));
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.prose h2 {
  margin-top: 3rem;
  font-size: 1.5rem;
}

.prose h3 {
  margin-top: 2rem;
}

.prose p,
.prose ul {
  margin-top: 1rem;
}

.definition-list {
  display: grid;
  margin: 2rem 0 0;
  grid-template-columns: 9rem 1fr;
  border-top: 1px solid var(--line);
}

.definition-list dt,
.definition-list dd {
  margin: 0;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.definition-list dt {
  font-weight: 800;
}

.cta-box {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: 0.85rem;
  background: var(--brand-dark);
  color: #fff;
}

.cta-box h2,
.cta-box p {
  color: #fff;
}

.cta-box a {
  color: #fff4bd;
}

.site-footer {
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
  background: #10251f;
  color: #d7e4df;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.25fr 1fr 1fr;
}

.site-footer h2,
.site-footer h3 {
  color: #fff;
  font-size: 1rem;
}

.site-footer p {
  max-width: 30rem;
  color: #bbcbc5;
  font-size: 0.87rem;
}

.site-footer ul {
  margin: 0.7rem 0 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 0.35rem;
}

.site-footer a {
  color: #e5f1ec;
}

.copyright {
  margin: 2.5rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid #345047;
  font-size: 0.78rem;
}

.status-banner {
  padding: 0.65rem 1rem;
  background: #fff0c9;
  color: #553b00;
  font-size: 0.82rem;
  font-weight: 700;
  text-align: center;
}

@media (max-width: 54rem) {
  .header-inner {
    padding: 1rem 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
  }

  .site-nav ul {
    width: max-content;
    padding-bottom: 0.25rem;
  }

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

  .article-aside {
    position: static;
    order: -1;
  }

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

@media (max-width: 38rem) {
  .header-inner,
  .footer-inner,
  .shell {
    width: min(calc(100% - 1.2rem), var(--max));
  }

  .brand {
    font-size: 0.9rem;
  }

  .site-nav ul {
    gap: 1rem;
  }

  .site-nav a {
    font-size: 0.85rem;
  }

  .hero {
    padding-top: 2.8rem;
  }

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

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .definition-list dt {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .definition-list dd {
    padding-top: 0.25rem;
  }
}

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

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

@media print {
  .site-header,
  .site-footer,
  .article-aside,
  .status-banner {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  a {
    color: #000;
  }
}