/* Neutral layout only: system fonts, grayscale, basic borders and layout. */
* { box-sizing: border-box; }
body { margin: 0; color: #111; background: #fff; font: 16px/1.6 system-ui, sans-serif; }
a { color: inherit; text-underline-offset: 3px; overflow-wrap: anywhere; }
button, summary { font: inherit; cursor: pointer; }
button { color: #111; background: #fff; border: 1px solid #888; padding: 9px 14px; min-height: 44px; }
:focus-visible { outline: 3px solid #111; outline-offset: 3px; }
[hidden] { display: none !important; }
.prototype-notice { padding: 8px 16px; font-size: 12px; text-align: center; border-bottom: 1px solid #aaa; background: #eee; }
.skip-link { position: absolute; left: 12px; top: -100px; padding: 10px; background: #fff; z-index: 30; }
.skip-link:focus { top: 8px; }
.site-header { max-width: 1200px; margin: 0 auto; padding: 20px 32px; display: flex; align-items: center; gap: 32px; border-bottom: 1px solid #888; }
.brand { font-weight: 700; max-width: 290px; line-height: 1.35; padding-block: 8px; text-decoration: none; }
.desktop-nav { display: flex; gap: 16px; align-items: center; margin-left: auto; }
.nav-direct { padding: 10px 14px; min-height: 44px; }
.nav-group { position: relative; }
.nav-group button { display: flex; gap: 12px; align-items: center; justify-content: space-between; }
.current-group, [aria-current="page"] { font-weight: 700; text-decoration: underline; }
.group-links { position: absolute; top: 100%; right: 0; width: 300px; border: 1px solid #888; background: #fff; padding: 8px; z-index: 10; max-height: 70vh; overflow: auto; }
.group-links a { display: block; padding: 9px 12px; min-height: 44px; text-decoration: none; }
.group-links a:hover { background: #eee; }
.mobile-trigger { display: none; margin-left: auto; }
.page-shell { max-width: 1200px; padding: 24px 32px 64px; margin: 0 auto; }
.breadcrumbs { font-size: 14px; margin-bottom: 32px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; list-style: none; padding: 0; gap: 8px 16px; }
.breadcrumbs li + li { border-left: 1px solid #aaa; padding-left: 16px; }
.reading-layout { display: grid; grid-template-columns: 220px minmax(0, 780px); gap: 48px; align-items: start; }
.reading-content { min-width: 0; }
.home .reading-layout { display: block; max-width: 880px; margin: 0 auto; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 24px; overflow-wrap: break-word; }
h2 { font-size: 24px; line-height: 1.35; margin: 40px 0 16px; }
h3 { font-size: 20px; line-height: 1.4; margin: 28px 0 12px; }
p, ul, ol { margin: 0 0 20px; }
li { margin-bottom: 8px; }
.reading-content h2, .reading-content h3 { scroll-margin-top: 24px; }
.toc { border-top: 1px solid #888; padding-top: 8px; position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow: auto; }
.toc summary { font-weight: 700; min-height: 44px; padding-block: 8px; }
.toc nav a { display: block; padding: 8px 0; font-size: 14px; line-height: 1.5; }
.toc .depth-3 { padding-left: 16px; }
.table-wrap { max-width: 100%; overflow-x: auto; margin: 24px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
td, th { border: 1px solid #aaa; text-align: left; padding: 12px; vertical-align: top; }
th { background: #eee; }
td a { display: inline-block; padding-block: 4px; }
.media-placeholder { margin: 28px 0 16px; }
.media-space { width: 100%; display: grid; place-items: center; padding: 8px; background: #ddd; border: 1px solid #888; }
.media-space span { text-align: center; font-size: 14px; }
.layout-annotation { color: #444; font-size: 13px; padding-top: 8px; }
.home-attribution { font-size: 13px; }
blockquote { margin: 0 0 20px; border-left: 2px solid #aaa; padding-left: 16px; }
.copy-code { display: block; margin-top: 8px; }
.copy-status { display: block; font-size: 14px; }
.site-footer { border-top: 1px solid #888; padding: 40px 32px; }
.footer-inner { max-width: 1136px; margin: auto; display: grid; grid-template-columns: 260px 1fr; gap: 48px; }
.footer-identity p { font-size: 14px; margin-block: 12px; }
.footer-nav { display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 24px; }
.footer-nav h3 { margin: 0 0 12px; font-size: 16px; }
.footer-nav ul { list-style: none; padding: 0; font-size: 14px; }
.footer-nav a { display: inline-block; padding-block: 4px; }
dialog { color: #111; background: #fff; border: 1px solid #888; width: min(480px, calc(100% - 24px)); max-height: calc(100dvh - 24px); padding: 16px; }
dialog::backdrop { background: rgb(0 0 0 / 50%); }
.dialog-head { display: flex; align-items: center; gap: 16px; border-bottom: 1px solid #888; padding-bottom: 16px; margin-bottom: 16px; }
.dialog-head strong { flex: 1; }
dialog .nav-group { border-bottom: 1px solid #aaa; }
dialog .nav-group button { width: 100%; border: 0; padding: 12px; }
dialog .group-links { position: static; width: auto; border: 0; max-height: none; padding: 0 12px 12px; }
dialog .nav-direct { display: block; }
@media (max-width: 900px) {
  .site-header { padding-inline: 24px; }
  .desktop-nav { display: none; }
  .mobile-trigger { display: block; }
  .page-shell { padding-inline: 24px; }
  .reading-layout { display: flex; flex-direction: column; gap: 28px; }
  .reading-content, .toc { width: 100%; }
  .toc { position: static; max-height: none; border-bottom: 1px solid #888; }
  .toc nav { padding-bottom: 16px; }
  .toc nav a { min-height: 44px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 540px) {
  .site-header { padding: 16px; gap: 16px; }
  .brand { max-width: 210px; font-size: 16px; }
  .page-shell { padding: 24px 16px 48px; }
  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  table { min-width: 480px; }
  .table-wrap { border-bottom: 1px solid #888; }
  body[data-page-id="P-CODES"] table { min-width: 0; }
  body[data-page-id="P-CODES"] td:first-child { width: 116px; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) table { min-width: 0; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) tbody { display: block; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) tr { display: block; border: 1px solid #aaa; margin-bottom: 16px; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) td { display: block; border: 0; padding: 8px 12px; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) td::before { content: attr(data-column); display: block; font-size: 13px; color: #444; }
  body:is([data-page-id="P-HOME"], [data-page-id="P-GUIDES"], [data-page-id="P-CLASSES-OVERVIEW"]) td a { min-height: 44px; padding-block: 10px; }
  .site-footer { padding: 32px 16px; }
  .footer-nav { grid-template-columns: 1fr; }
  .footer-nav a { padding-block: 10px; min-height: 44px; }
}