/* ============================================================
   OpenSpineConsortium — the shared shell (site.css)

   Loaded after style.css on every page. It adds, and never
   rewrites, what the page-per-section site needs:

     header       five tabs, a mark on the current one, a drawer
                  only under 720px
     subnav       the section strip under the header
     crumbs       the breadcrumb line above the footer
     footer__dir  the footer's directory of every page
     components   prose (legal texts), callouts, forms, tiles,
                  browser cards
     sub-sites    offsets for pages that had their own header
     app pages    the header on the full-screen PACS demo

   The markup for all of it is written by tools/build_site.py
   from one site map; do not hand-edit the header or footer of a
   page, run the build.
   ============================================================ */

:root { --nav-h: 64px; }

/* ============================================================
   HEADER
   ============================================================ */
.nav { height: var(--nav-h); padding-top: 0; padding-bottom: 0; }

/* THE SHELL LOOKS THE SAME ON EVERY PAGE, EVEN WHERE A PAGE RESTYLES ITS OWN LINKS.
   The sub-sites set `body.sm a { color: ... }`, redefine --teal at :root (the timeline's is a
   different green) or run at another body size. So the shared parts carry the site's tokens
   themselves and win on specificity: #nav, or two classes. */
#nav, .subnav, .crumbs-band, .footer {
  --paper: #F1EEE3; --paper-card: #FBFAF4; --paper-deep: #E7E2D2;
  --ink: #1A1C18; --ink-soft: #585B50; --ink-faint: #8C8E82;
  --teal: #0E5F58; --teal-deep: #0A423D; --teal-bright: #157A70; --ochre: #BC6B26;
  --line: rgba(26, 28, 24, 0.14); --line-soft: rgba(26, 28, 24, 0.08);
  --font-display: "Newsreader", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.62;
  letter-spacing: normal;
  text-align: left;
}
#nav a, .subnav a, .crumbs-band a, .footer a { text-decoration: none; }
#nav .nav__brand { color: var(--ink); font-family: var(--font-display); font-weight: 400; }
#nav .nav__brand strong { color: var(--teal); font-weight: 600; }
#nav .nav__links a { color: var(--ink-soft); font-weight: 400; }
#nav .nav__links a:hover,
#nav .nav__links a[aria-current] { color: var(--ink); }
#nav .nav__links a[aria-current]:not(.nav__cta)::after { width: 100%; }
#nav .nav__links a.nav__cta { color: var(--paper-card); background: var(--ink); font-weight: 500; }
#nav .nav__links a.nav__cta:hover,
#nav .nav__links a.nav__cta[aria-current] { background: var(--teal); }

.nav a:focus-visible,
.nav button:focus-visible,
.subnav a:focus-visible,
.crumbs a:focus-visible,
.footer a:focus-visible,
.tile:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 12px; top: -60px;
  z-index: 200;
  background: var(--ink);
  color: var(--paper-card);
  padding: 10px 16px;
  border-radius: 100px;
  font-size: .9rem;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* style.css opens the drawer at 1300px because the bar once held sixteen links.
   Five tabs and a button fit in one row down to 721px. */
@media (min-width: 721px) {
  .nav { padding-left: 32px; padding-right: 32px; }
  .nav__links {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 28px;
    background: none;
    border: 0;
    padding: 0;
    transform: none;
    transition: none;
    max-height: none;
    overflow: visible;
    box-shadow: none;
    visibility: visible;
  }
  .nav__links.is-open { box-shadow: none; }
  .nav__links a { padding: 0; width: auto; font-size: .92rem; }
  .nav__links a.nav__cta { padding: 9px 18px; margin-top: 0; }
  .nav__toggle { display: none; }
}
@media (min-width: 721px) and (max-width: 860px) {
  .nav { padding-left: 20px; padding-right: 20px; }
  .nav__links { gap: 15px; }
  .nav__links a { font-size: .86rem; }
  .nav__links a.nav__cta { padding: 8px 15px; }
  #nav .nav__brand { font-size: 1rem; gap: 7px; }
}

@media (max-width: 720px) {
  .nav { padding-left: 16px; padding-right: 16px; }
  .nav__links {
    top: var(--nav-h);
    max-height: calc(100dvh - var(--nav-h));
    padding-left: 16px;
    padding-right: 16px;
    visibility: hidden;
    transition: transform .36s var(--ease), visibility 0s linear .36s;
  }
  .nav__links.is-open { visibility: visible; transition: transform .36s var(--ease); }
  .nav__links a { font-size: 1.05rem; border-bottom: 1px solid var(--line-soft); }
  .nav__links a:not(.nav__cta)::after { display: none; }
  #nav .nav__links a[aria-current]:not(.nav__cta) { color: var(--teal); font-weight: 600; }
  .nav__links a.nav__cta {
    width: auto;
    align-self: flex-start;
    padding: 11px 22px;
    margin-top: 14px;
    border-bottom: 0;
  }
}

/* generated pages: the header is fixed, so the page starts below it */
body[data-shell="page"] { padding-top: var(--nav-h); }
body[data-shell="page"] main > .section:first-child { padding-top: 80px; }
body[data-shell="page"] .hero { padding-top: 96px; min-height: 0; }
@media (max-width: 1300px) {
  body[data-shell="page"] main > .section:first-child { padding-top: 56px; }
  body[data-shell="page"] .hero { padding-top: 64px; }
}
@media (max-width: 720px) {
  body[data-shell="page"] .section { padding-left: 16px; padding-right: 16px; }
  body[data-shell="page"] .hero { padding-left: 16px; padding-right: 16px; }
}

/* ============================================================
   SECTION STRIP (sub-navigation)
   ============================================================ */
.subnav {
  background: rgba(251, 250, 244, 0.72);
  border-bottom: 1px solid var(--line-soft);
}
.subnav__in {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.subnav .subnav__title {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--ink);
}
.subnav .subnav__title:hover { color: var(--teal); }
.subnav__pills {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}
.subnav .subnav__pill {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}
.subnav .subnav__pill:hover { border-color: var(--teal); color: var(--ink); }
.subnav .subnav__pill[aria-current] {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--paper-card);
}
/* stacked below 820px: in one row the eight Data & Tools pills leave "X-ray" alone on a second,
   right-aligned line at tablet widths (768) */
@media (max-width: 819px) {
  .subnav__in {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .subnav__pills { margin-left: 0; justify-content: flex-start; }
}
@media (max-width: 720px) {
  .subnav__in { padding: 10px 16px 12px; }
}

/* ============================================================
   BREADCRUMB (above the footer, as apple.com places it)
   ============================================================ */
.crumbs-band { background: var(--paper); border-top: 1px solid var(--line-soft); }
.crumbs {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 32px;
  font-size: 0.82rem;
  color: var(--ink-faint);
}
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 8px; }
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "\203A"; color: var(--ink-faint); }
.crumbs-band .crumbs a { color: var(--ink-soft); }
.crumbs-band .crumbs a:hover { color: var(--teal); }
.crumbs-band .crumbs [aria-current] { color: var(--ink); }
.crumbs svg { width: 16px; height: 16px; color: var(--teal); display: block; }
@media (max-width: 720px) { .crumbs { padding: 14px 16px; } }

/* ============================================================
   FOOTER DIRECTORY
   ============================================================ */
.footer__top { padding-bottom: 28px; }
.footer .footer__tag { font-size: 0.9rem; color: rgba(241, 238, 227, 0.6); }
.footer__dir {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px 0 34px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.footer .footer__col h2 {
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(241, 238, 227, 0.5);
  line-height: 1.5;
  margin: 0 0 12px;
  padding: 0;
  border: 0;
}
.footer .footer__col h2 a { color: inherit; }
.footer .footer__col h2 a:hover { color: var(--paper); }
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer .footer__col li a {
  font-size: 0.88rem;
  color: rgba(241, 238, 227, 0.72);
  transition: color 0.2s var(--ease);
}
.footer .footer__col li a:hover { color: var(--paper); }
.footer .footer__connect { border-top: 0; }
.footer .footer__brand { color: var(--paper); }
.footer .footer__brand strong { color: #4FA89D; font-weight: 600; }
.footer .footer__social a { color: rgba(241, 238, 227, 0.7); }
.footer .footer__social a:hover { color: #4FA89D; }
.footer .footer__bottom p { margin: 0; }
@media (max-width: 960px) { .footer__dir { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 720px) {
  .footer { padding-left: 16px; padding-right: 16px; }
  .footer__dir { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; }
}

/* ============================================================
   PAGE COMPONENTS
   ============================================================ */

/* a page title on pages that are not a section of the old one-pager */
.page-head { margin-bottom: 36px; }
.page-head .eyebrow { display: block; margin-bottom: 14px; }
.page-head h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.page-head p {
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 640px;
  margin-top: 16px;
}

/* long text: the agreement, the privacy statement, support */
.prose { max-width: 760px; overflow-wrap: break-word; }
.prose h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin: 0 0 0.7em;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.45rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 2em 0 0.55em;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.6em 0 0.4em;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { margin: 0 0 1em; padding-left: 1.4em; }
.prose li { margin: 0.4em 0; }
.prose li > p { margin: 0; }
.prose a { color: var(--teal); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.prose a:hover { color: var(--teal-bright); }
.prose strong { font-weight: 600; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--paper-card);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 0 4px;
  overflow-wrap: anywhere;
}
.prose pre {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  white-space: pre-wrap;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 0 0 1em;
}
.prose pre code { border: 0; padding: 0; background: none; }
.prose blockquote { border-left: 3px solid var(--line); padding-left: 16px; color: var(--ink-soft); margin: 0 0 1em; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.table-scroll {
  overflow-x: auto;
  margin: 0 0 1.4em;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-card);
  -webkit-overflow-scrolling: touch;
}
.prose table { border-collapse: collapse; width: 100%; font-size: 0.9rem; line-height: 1.5; }
.prose th, .prose td {
  border-bottom: 1px solid var(--line-soft);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
  min-width: 9em;
}
.prose th { font-weight: 600; background: rgba(26, 28, 24, 0.03); }
.prose td code, .prose th code { overflow-wrap: normal; white-space: nowrap; }
.prose tr:last-child td { border-bottom: 0; }

/* the agreement's table of contents */
.toc {
  margin: 0 0 2.4em;
  padding: 18px 22px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 0.9rem;
}
.toc p { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 8px; }
.toc ol { list-style: none; padding: 0; margin: 0; columns: 2; column-gap: 28px; }
.toc li { margin: 0 0 6px; break-inside: avoid; }
.toc a { color: var(--ink-soft); text-decoration: none; }
.toc a:hover { color: var(--teal); }
@media (max-width: 720px) { .toc ol { columns: 1; } }

/* a quiet box: a note, a notice, a summary */
.callout {
  margin: 0 0 1.6em;
  padding: 18px 22px;
  border-left: 3px solid var(--teal);
  background: var(--paper-card);
  border-radius: 0 12px 12px 0;
  font-size: 0.97rem;
}
.callout p:last-child { margin-bottom: 0; }
.callout--ochre { border-left-color: var(--ochre); background: rgba(188, 107, 38, 0.06); }
.note { font-size: 0.88rem; color: var(--ink-faint); }

/* tiles: a section landing's children */
.tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 26px 26px 22px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.tile:hover { border-color: var(--teal); transform: translateY(-2px); box-shadow: 0 18px 36px -30px rgba(26, 28, 24, 0.45); }
.tile__k { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--teal); }
.tile h2 { font-family: var(--font-display); font-weight: 500; font-size: 1.55rem; letter-spacing: -0.01em; line-height: 1.15; }
.tile p { font-size: 0.95rem; color: var(--ink-soft); }
.tile__go { margin-top: auto; padding-top: 10px; font-size: 0.88rem; color: var(--teal); }
@media (max-width: 960px) { .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .tiles { grid-template-columns: 1fr; } }

/* the lessons one level below a landing page's tiles (build:section-index), so every page is at
   most two clicks from the header */
.sindex-wrap { margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--line); }
.sindex-wrap > .tile__k { display: block; margin-bottom: 18px; }
.sindex { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 40px; }
.sindex__group h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.25rem; line-height: 1.2; margin-bottom: 10px; }
.sindex__group h3 a { color: var(--ink); }
.sindex__group h3 a:hover { color: var(--teal); }
.sindex__group ul { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.sindex__group li a { font-size: 0.95rem; color: var(--ink-soft); border-bottom: 1px solid transparent; transition: color .2s var(--ease), border-color .2s var(--ease); }
.sindex__group li a:hover { color: var(--teal); border-bottom-color: var(--teal); }
@media (max-width: 720px) { .sindex { grid-template-columns: 1fr; } .sindex-wrap { margin-top: 40px; } }

/* ============================================================
   THE REQUEST FORM (same fields and script everywhere it appears)
   ============================================================ */
.request-form { max-width: 620px; }
.request-form form { display: grid; gap: 4px; }
.request-form label { font-weight: 600; font-size: 0.95rem; margin-top: 14px; }
.request-form label:first-child { margin-top: 0; }
.request-form input,
.request-form textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.request-form input:focus,
.request-form textarea:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(14, 95, 88, 0.16);
}
.request-form textarea { min-height: 110px; resize: vertical; }
.request-form small { color: var(--ink-faint); font-size: 0.84rem; }
.request-form code { font-family: var(--font-mono); font-size: 0.9em; }
.request-form button { justify-self: start; margin-top: 20px; cursor: pointer; }
.request-form button:disabled { opacity: 0.5; cursor: default; transform: none; background: var(--ink); border-color: var(--ink); }
.request-form #status { display: none; }
.request-form #status.show {
  display: block;
  margin: 0 0 18px;
  padding: 12px 16px;
  border-left: 3px solid var(--teal);
  background: var(--paper-card);
  border-radius: 0 10px 10px 0;
  font-size: 0.95rem;
}
.request-form .fineprint { margin-top: 22px; font-size: 0.84rem; color: var(--ink-faint); }
.request-form .fineprint a { color: var(--teal); text-decoration: underline; text-underline-offset: 2px; }

/* ============================================================
   BROWSER CARDS
   ============================================================ */
.browsers { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.browser {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 14px;
}
.browser__name { font-family: var(--font-display); font-size: 1.35rem; font-weight: 500; letter-spacing: -0.01em; }
.browser .btn { align-self: flex-start; font-size: 0.88rem; padding: 10px 18px; }
.browser__note { font-size: 0.8rem; color: var(--ink-faint); line-height: 1.45; margin-top: auto; }
@media (max-width: 960px) { .browsers { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 720px) { .browsers { grid-template-columns: 1fr; } }

/* ============================================================
   SUB-SITES: pages that had a header of their own
   Each laid its first element out below a fixed bar; the strip now
   does that, so their own clearance comes off.
   ============================================================ */
body[data-shell="sub"] .subnav { margin-top: var(--nav-h); }
body[data-shell="sub"] .subnav ~ .sm-bar { margin-top: 0; }
body.sm .sm-bar { top: var(--nav-h); }
body[data-shell="sub"] .subnav ~ .smh__wrap { padding-top: 48px; }
body[data-shell="sub"] .subnav ~ .atlas__wrap > p:first-child { margin-top: 2.5rem !important; }
body[data-shell="sub"] .subnav ~ .cl__wrap { padding-top: 32px; }
body[data-shell="sub"] .crumbs-band { position: relative; }
@media (max-width: 720px) {
  body[data-shell="sub"] .subnav ~ .smh__wrap { padding-top: 28px; }
}

/* ============================================================
   APP PAGES (the PACS demo): the same header, in the page flow.
   These pages do not load style.css (its reset and body rules
   would restyle the viewer) and their own :root redefines --ink
   and --line for a dark theme, so the header carries its tokens.
   ============================================================ */
body[data-shell="app"] .nav {
  --paper: #F1EEE3;
  --paper-card: #FBFAF4;
  --ink: #1A1C18;
  --ink-soft: #585B50;
  --ink-faint: #8C8E82;
  --teal: #0E5F58;
  --teal-bright: #157A70;
  --line: rgba(26, 28, 24, 0.14);
  --line-soft: rgba(26, 28, 24, 0.08);
  --font-display: "Newsreader", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}
body[data-shell="app"] .nav * { box-sizing: border-box; }
body[data-shell="app"] .nav a { color: inherit; text-decoration: none; }
body[data-shell="app"] .nav__brand { display: flex; align-items: center; gap: 9px; font-family: var(--font-display); font-size: 1.18rem; letter-spacing: -0.01em; }
body[data-shell="app"] .nav__brand strong { color: var(--teal); font-weight: 600; }
body[data-shell="app"] .nav__mark { width: 26px; height: 26px; color: var(--teal); }
body[data-shell="app"] .nav__links { display: flex; align-items: center; gap: 28px; margin: 0; padding: 0; }
body[data-shell="app"] .nav__links a { font-size: 0.92rem; color: var(--ink-soft); position: relative; transition: color 0.2s var(--ease); }
body[data-shell="app"] .nav__links a:not(.nav__cta)::after {
  content: ""; position: absolute; left: 0; bottom: -5px; width: 0; height: 1.5px;
  background: var(--teal); transition: width 0.28s var(--ease);
}
body[data-shell="app"] .nav__links a:not(.nav__cta):hover { color: var(--ink); }
body[data-shell="app"] .nav__links a:not(.nav__cta):hover::after,
body[data-shell="app"] .nav__links a[aria-current]:not(.nav__cta)::after { width: 100%; }
body[data-shell="app"] .nav__links a[aria-current] { color: var(--ink); }
body[data-shell="app"] .nav__links a.nav__cta {
  background: var(--ink); color: var(--paper-card); padding: 9px 18px; border-radius: 100px; font-weight: 500;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}
body[data-shell="app"] .nav__links a.nav__cta:hover { background: var(--teal); transform: translateY(-1px); }
body[data-shell="app"] .nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
body[data-shell="app"] .nav__toggle span { display: block; width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.2s var(--ease); }
body[data-shell="app"] .nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body[data-shell="app"] .nav__toggle.is-open span:nth-child(2) { opacity: 0; }
body[data-shell="app"] .nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
@media (max-width: 720px) {
  body[data-shell="app"] .nav__toggle { display: flex; }
  body[data-shell="app"] .nav__links {
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: var(--paper-card); border-bottom: 1px solid var(--line);
    padding: 16px 16px 24px;
    box-shadow: 0 18px 34px rgba(26, 28, 24, 0.16);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: transform .3s var(--ease), opacity .3s var(--ease), visibility 0s linear .3s;
  }
  body[data-shell="app"] .nav__links.is-open { transform: none; opacity: 1; visibility: visible; transition: transform .3s var(--ease), opacity .3s var(--ease); }
  body[data-shell="app"] .nav__links a { width: 100%; padding: 12px 0; font-size: 1.05rem; border-bottom: 1px solid var(--line-soft); }
  body[data-shell="app"] .nav__links a:not(.nav__cta)::after { display: none; }
  body[data-shell="app"] .nav__links a[aria-current]:not(.nav__cta) { color: var(--teal); font-weight: 600; }
  body[data-shell="app"] .nav__links a.nav__cta { width: auto; margin-top: 14px; padding: 11px 22px; border-bottom: 0; }
}
/* the same tightening the other pages get between 721 and 860px (their rule loses to the app
   selectors above on specificity); without it "Data & Tools" and "Get Involved" wrap onto two
   lines and the brand runs into "Home" at tablet widths */
body[data-shell="app"] .nav__links a { white-space: nowrap; }
@media (min-width: 721px) and (max-width: 860px) {
  body[data-shell="app"] .nav__links { gap: 15px; }
  body[data-shell="app"] .nav__links a { font-size: .86rem; }
  body[data-shell="app"] .nav__links a.nav__cta { padding: 8px 15px; }
}
/* the viewer fills what the header leaves: the demo's own layout is 100% minus its 52px bar */
@media (min-width: 821px) {
  body[data-shell="app"] .stage { height: calc(100% - 52px - var(--nav-h)); }
}
@media (max-width: 1180px) {
  /* minmax(0, 1fr), not 1fr: a 1fr track grows to its widest nowrap line, and the case caption
     made the X-ray panes 468px wide in a 390px phone (true before the site header came) */
  body[data-shell="app"] .stage--xr2 { height: auto; grid-template-columns: minmax(0, 1fr); }
}

/* ============================================================
   MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .nav__links, .tile, .subnav__pill, .skip-link { transition: none !important; }
  .tile:hover { transform: none; }
}

/* ============================================================
   BEETHOVEN FOR VS CODE (/beethoven/vscode/): the home page's
   classes (hero.css) with three small additions
   ============================================================ */
.vsc-eyebrow { display: block; margin-bottom: 16px; }
.bh-sec .vsc-steps { text-align: left; max-width: 720px; margin: 0 auto; }
.vsc-steps p { color: var(--ink-soft); }
.bh-sec .vsc-get { grid-template-columns: minmax(0, 340px); justify-content: center; }
.vsc-get .browser { text-align: left; }
.page-vsc .bh__fine a { white-space: nowrap; }

/* ============================================================
   ACCESS ADMIN (/beethoven/admin.html): the maintainer's page
   ============================================================ */
.admin h2 { font-family: var(--font-display); font-weight: 500; font-size: 1.5rem; margin: 40px 0 12px; }
.admin__box { border: 1px solid var(--line); border-radius: 12px; background: var(--paper-card); padding: 16px 18px; margin: 16px 0; }
.admin #msg:empty { display: none; }
.admin .hidden { display: none; }
.admin label { display: block; margin: 10px 0 4px; font-weight: 600; font-size: 0.95rem; }
.admin input {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
}
.admin input:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(14, 95, 88, 0.16); }
.admin small { display: block; margin-top: 6px; color: var(--ink-faint); font-size: 0.84rem; }
.admin code { font-family: var(--font-mono); font-size: 0.9em; }
.admin button {
  font: inherit;
  font-size: 0.9rem;
  color: var(--paper-card);
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 100px;
  padding: 7px 16px;
  margin: 8px 6px 2px 0;
  cursor: pointer;
}
.admin button:hover { background: var(--teal); border-color: var(--teal); }
.admin button.quiet { color: var(--ink); background: transparent; border-color: var(--line); }
.admin button.quiet:hover { border-color: var(--teal); color: var(--teal); }
.admin button:disabled { opacity: 0.5; cursor: default; }
.admin table { border-collapse: collapse; width: 100%; font-size: 0.9rem; line-height: 1.5; }
.admin th, .admin td { border-bottom: 1px solid var(--line); padding: 8px 10px; vertical-align: top; text-align: left; overflow-wrap: anywhere; }
.admin th { font-weight: 600; }
.admin td.admin__act { white-space: nowrap; }
.admin td.admin__none { color: var(--ink-faint); }
.admin__row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.admin__row > div { flex: 1 1 160px; }