:root {
  color-scheme: light dark;
  --bg: #f6f7f5;
  --surface: #ffffff;
  --text: #161a18;
  --muted: #5d6661;
  --line: #d9dedb;
  --accent: #147a63;
  --accent-strong: #0b5d4b;
  --warm: #a3412e;
  --focus: #0066cc;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

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

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.nav {
  width: min(calc(100% - 32px), var(--max));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 720;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.94rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a[aria-current="page"] {
  color: var(--text);
  font-weight: 650;
}

.hero,
.page-intro,
.content,
.site-footer-inner {
  width: min(calc(100% - 32px), var(--max));
  margin-inline: auto;
}

.hero {
  min-height: 460px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  align-items: center;
  gap: 72px;
  padding-block: 64px;
}

.hero h1,
.page-intro h1 {
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero p {
  max-width: 640px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.16rem;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--warm);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-art {
  display: grid;
  place-items: center;
}

.hero-art img {
  width: min(100%, 320px);
  aspect-ratio: 1;
  border-radius: 22%;
  box-shadow: 0 24px 60px rgb(22 26 24 / 18%);
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button-link {
  min-height: 44px;
  padding: 9px 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font-weight: 650;
  text-decoration: none;
}

.button-link.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.utility-band {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.utility-grid {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.utility-item {
  min-height: 132px;
  padding: 28px;
}

.utility-item + .utility-item {
  border-left: 1px solid var(--line);
}

.utility-item h2 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.utility-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.page-intro {
  padding-block: 64px 42px;
  border-bottom: 1px solid var(--line);
}

.page-intro h1 {
  max-width: 820px;
  font-size: clamp(2.1rem, 5vw, 4rem);
}

.page-intro .lede {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.meta {
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.88rem;
}

.language-nav {
  width: fit-content;
  margin-top: 24px;
  padding: 3px;
  display: flex;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
}

.language-nav a {
  min-height: 38px;
  padding: 6px 13px;
  display: inline-flex;
  align-items: center;
  border-radius: 5px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.language-nav a:hover {
  background: var(--bg);
  color: var(--text);
}

.content {
  display: grid;
  grid-template-columns: 220px minmax(0, 720px);
  gap: 72px;
  padding-block: 48px 80px;
}

.toc {
  position: sticky;
  top: 28px;
  align-self: start;
}

.toc p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 720;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding-block: 5px;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.article section + section {
  margin-top: 46px;
  padding-top: 46px;
  border-top: 1px solid var(--line);
}

.article h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  line-height: 1.25;
}

.article h3 {
  margin: 28px 0 8px;
  font-size: 1.05rem;
}

.article p,
.article ul,
.article ol {
  margin-top: 0;
  margin-bottom: 16px;
}

.article li + li {
  margin-top: 8px;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  background: var(--surface);
}

.notice p:last-child {
  margin-bottom: 0;
}

.english-section {
  scroll-margin-top: 24px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer-inner {
  min-height: 92px;
  padding-block: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .nav {
    min-height: 58px;
  }

  .nav-links {
    gap: 12px;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 42px;
    padding-block: 48px;
  }

  .hero-art {
    justify-content: start;
  }

  .hero-art img {
    width: 180px;
  }

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

  .utility-item + .utility-item {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .page-intro {
    padding-block: 46px 34px;
  }

  .content {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-block: 34px 64px;
  }

  .toc {
    position: static;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--line);
  }

  .site-footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121513;
    --surface: #1a1e1b;
    --text: #f0f3f1;
    --muted: #aeb7b2;
    --line: #343b37;
    --accent: #36a98c;
    --accent-strong: #72d4ba;
    --warm: #e18a74;
    --focus: #66aaff;
  }

  .hero-art img {
    box-shadow: 0 24px 60px rgb(0 0 0 / 40%);
  }
}

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