:root {
  color-scheme: light;
  --canvas: #f7f0e3;
  --paper: #fffdf8;
  --paper-strong: #ffffff;
  --ink: #392f25;
  --muted: #766c61;
  --line: #dfd5c6;
  --mint: #57aa8d;
  --mint-dark: #256a59;
  --mint-soft: #dcefe7;
  --amber: #dda65c;
  --amber-soft: #f8e6c8;
  --blue: #245e78;
  --danger: #943d34;
  --danger-soft: #f8e2dd;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    "Noto Sans CJK SC", "Noto Sans CJK TC", "Noto Sans JP", "Noto Sans KR",
    Arial, sans-serif;
  font-size: 16px;
  line-height: 1.68;
  letter-spacing: 0;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

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

.header-inner,
.page-shell,
.footer-inner,
.hero-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--mint);
  font-size: 14px;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
}

.language-menu {
  position: relative;
}

.language-menu summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 650;
  list-style: none;
}

.language-menu summary::-webkit-details-marker {
  display: none;
}

.language-panel {
  position: absolute;
  z-index: 10;
  right: 0;
  top: calc(100% + 12px);
  width: 220px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-strong);
  box-shadow: 0 16px 34px rgb(57 47 37 / 14%);
}

.language-panel a {
  display: block;
  padding: 8px 10px;
  border-radius: 5px;
  color: var(--ink);
  text-decoration: none;
}

.language-panel a:hover,
.language-panel a[aria-current="page"] {
  background: var(--mint-soft);
  color: var(--mint-dark);
}

.draft-banner {
  padding: 10px 20px;
  color: var(--danger);
  background: var(--danger-soft);
  border-bottom: 1px solid #ecc1b8;
  font-size: 14px;
  font-weight: 650;
  text-align: center;
}

.hero {
  padding: 72px 0 48px;
  background: var(--paper);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--mint-dark);
  font-size: 14px;
  font-weight: 750;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.2;
}

h1 {
  max-width: 900px;
  margin: 0;
  font-size: 64px;
}

h1,
h2,
h3,
.document,
.document-card,
.language-card,
.operator-block {
  overflow-wrap: anywhere;
}

.hero-copy {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.metadata {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.page-shell {
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, 760px);
  gap: 72px;
  justify-content: center;
  padding-block: 48px 80px;
}

.toc {
  align-self: start;
  position: sticky;
  top: 24px;
  padding-left: 18px;
  border-left: 3px solid var(--mint);
}

.toc-title {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
  text-transform: uppercase;
}

.toc a {
  display: block;
  margin: 8px 0;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.toc a:hover {
  color: var(--mint-dark);
}

.document {
  min-width: 0;
}

.document section {
  padding: 0 0 34px;
  margin: 0 0 34px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.document section:last-child {
  border-bottom: 0;
}

.document h2 {
  margin: 0 0 16px;
  font-size: 26px;
}

.document h3 {
  margin: 22px 0 8px;
  font-size: 19px;
}

.document p,
.document ul {
  margin: 0 0 14px;
}

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

.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--amber);
  background: var(--amber-soft);
  color: #5d4323;
}

.operator-block {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-strong);
}

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

.document-grid,
.language-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.document-card,
.language-card {
  min-height: 156px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-strong);
  text-decoration: none;
}

.document-card:hover,
.language-card:hover {
  border-color: var(--mint);
}

.document-card h2,
.language-card h2 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 21px;
}

.document-card p,
.language-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.section-band {
  padding: 48px 0 80px;
}

.section-band .hero-inner > h2 {
  margin: 0 0 20px;
  font-size: 28px;
}

.source-list {
  padding-left: 20px;
}

.source-list li {
  margin-bottom: 12px;
}

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

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-block: 28px;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner p {
  margin: 0;
}

.skip-link {
  position: fixed;
  z-index: 30;
  top: 8px;
  left: 8px;
  transform: translateY(-160%);
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
}

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

@media (max-width: 760px) {
  .header-inner,
  .page-shell,
  .footer-inner,
  .hero-inner {
    width: min(calc(100% - 28px), var(--max));
  }

  .header-links > a {
    display: none;
  }

  .hero {
    padding: 48px 0 34px;
  }

  h1 {
    font-size: 40px;
  }

  .page-shell {
    display: block;
    padding-block: 32px 56px;
  }

  .toc {
    position: static;
    margin-bottom: 34px;
  }

  .document-grid,
  .language-grid {
    grid-template-columns: 1fr;
  }

  .document-card,
  .language-card {
    min-height: 0;
  }

  .footer-inner {
    display: block;
  }

  .footer-inner p + p {
    margin-top: 8px;
  }
}

@media print {
  body,
  html {
    background: #fff;
  }

  .site-header,
  .draft-banner,
  .toc,
  .site-footer {
    display: none;
  }

  .hero {
    padding: 0 0 28px;
  }

  .page-shell {
    display: block;
    width: 100%;
    padding: 0;
  }

  .document section {
    break-inside: avoid;
  }
}