/* Common Brand Chrome v1 (OD-027). Opt-in only on the three Phase 2 pages.
 * layout.css remains the Base/Token entry; reading components are untouched.
 */
.common-brand-chrome { --chrome-anchor-offset: 0px; }
.common-brand-chrome :where([id], a, button),
.common-brand-chrome.hexagram-parent-page :where([id], a, button) {
  scroll-margin-top: var(--chrome-anchor-offset);
}
.common-brand-chrome .brand-header {
  position: relative;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-gold-decorative);
  color: var(--color-ai-900);
}
.common-brand-chrome .brand-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 64px;
}
.common-brand-chrome .brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 44px;
  color: inherit;
  text-decoration: none;
}
.common-brand-chrome .brand-link__logo {
  display: block;
  width: 44px;
  height: 44px;
  max-width: none;
  flex: 0 0 auto;
  object-fit: contain;
}
.common-brand-chrome .brand-link__name {
  font: 500 1.375rem/1.4 var(--font-mincho);
  letter-spacing: .06em;
  overflow-wrap: anywhere;
}
.common-brand-chrome .brand-menu-toggle {
  margin-left: auto;
  flex: 0 0 auto;
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 5px;
  min-width: 48px;
  min-height: 48px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ai-900);
  font: .625rem/1.4 var(--font-gothic);
  cursor: pointer;
}
.common-brand-chrome .brand-menu-toggle__lines {
  display: grid;
  gap: 4px;
  width: 22px;
}
.common-brand-chrome .brand-menu-toggle__lines i {
  display: block;
  height: 1px;
  background: currentColor;
}
.common-brand-chrome .brand-header .global-nav {
  display: block;
  flex: 1 0 100%;
  min-width: 0;
  padding: 8px 0 0;
}
.common-brand-chrome .brand-header .global-nav ul,
.common-brand-chrome .brand-footer ul,
.common-brand-chrome .page-toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.common-brand-chrome .brand-header .global-nav ul { display: grid; gap: 4px; }
.common-brand-chrome .brand-header .global-nav a {
  display: flex;
  align-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--color-ai-900);
  font: 500 .875rem/1.6 var(--font-gothic);
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.common-brand-chrome .brand-header .global-nav a::after { content: none; }
.common-brand-chrome .brand-header .global-nav .global-nav__primary {
  color: var(--color-surface);
  background: var(--color-ai-700);
}
.common-brand-chrome .brand-header .global-nav a:hover,
.common-brand-chrome .brand-header .global-nav a:focus-visible,
.common-brand-chrome .brand-header .global-nav a[aria-current="page"],
.common-brand-chrome .brand-link:hover,
.common-brand-chrome .brand-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: .25em;
}
.common-brand-chrome .brand-menu-toggle:hover { background: var(--color-ai-100); }
.common-brand-chrome .brand-header :is(a, button):focus-visible,
.common-brand-chrome .page-toc a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-on-light);
  outline-offset: var(--focus-ring-offset);
}
.common-brand-chrome .brand-footer {
  padding: 40px 24px 24px;
  color: var(--color-surface);
  background: var(--color-ai-900);
  border-top: 1px solid var(--color-gold-decorative);
}
.common-brand-chrome .brand-footer__inner { max-width: 960px; margin: 0 auto; }
.common-brand-chrome .brand-footer .brand-link { margin-bottom: 24px; }
.common-brand-chrome .brand-footer a {
  color: inherit;
  text-decoration: none;
}
.common-brand-chrome .brand-footer a:hover,
.common-brand-chrome .brand-footer a:focus-visible {
  text-decoration: underline;
  text-underline-offset: .25em;
}
.common-brand-chrome .brand-footer a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-on-dark);
  outline-offset: var(--focus-ring-offset);
}
.common-brand-chrome .footer-site-nav ul,
.common-brand-chrome .footer-utility-nav ul,
.common-brand-chrome .brand-footer__sisters {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}
.common-brand-chrome .brand-footer :is(.footer-site-nav, .footer-utility-nav, .brand-footer__sisters) a {
  display: inline-flex;
  align-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 8px 0;
  font: .875rem/1.7 var(--font-gothic);
  overflow-wrap: anywhere;
}
.common-brand-chrome .footer-site-nav--expanded {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 24px;
}
.common-brand-chrome .footer-site-nav--expanded h2 {
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-gold-decorative);
  color: var(--color-gold-text-on-dark);
  font: 500 1rem/1.6 var(--font-mincho);
}
.common-brand-chrome .footer-site-nav--expanded ul { display: block; }
.common-brand-chrome .footer-site-nav--expanded .nav-icon {
  width: 14px;
  height: 14px;
  margin-right: 5px;
  filter: brightness(0) invert(1);
}
.common-brand-chrome .footer-utility-nav {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-gold-decorative);
}
.common-brand-chrome .brand-footer__sisters { margin-top: 12px; }
.common-brand-chrome .brand-footer__copyright {
  margin: 20px 0 0;
  color: var(--color-gold-text-on-dark);
  font: .75rem/1.7 var(--font-gothic);
}
.common-brand-chrome .page-toc {
  max-width: 1008px;
  margin: 24px auto 0;
  padding: 0 24px;
  position: static;
}
.common-brand-chrome .page-toc ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 8em), 1fr));
  gap: 8px 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: .875rem;
}
.common-brand-chrome .page-toc a {
  display: flex;
  align-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 8px 0;
  color: var(--color-ai-700);
  font: .875rem/1.7 var(--font-gothic);
  text-underline-offset: .25em;
}
/* The 50em fit threshold is shared with brand-chrome.js.
 * JS additionally checks actual font/label fit, including enlarged text.
 */
@media (min-width: 50em) {
  .common-brand-chrome .brand-header:not([data-compact="true"]) { position: sticky; top: 0; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .brand-header__inner {
    min-height: 80px;
    padding: 12px 24px;
    flex-wrap: nowrap;
    gap: 32px;
  }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .brand-link { flex: 0 0 auto; gap: 12px; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .brand-link__logo,
  .common-brand-chrome .brand-footer .brand-link__logo { width: 56px; height: 56px; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .brand-link__name,
  .common-brand-chrome .brand-footer .brand-link__name { font-size: 1.625rem; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .global-nav {
    flex: 0 0 auto;
    padding: 0;
  }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .global-nav ul { display: flex; gap: 8px; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .global-nav a { white-space: nowrap; }
  .common-brand-chrome .brand-header:not([data-compact="true"]) .brand-menu-toggle { display: none; }
  .common-brand-chrome .page-toc ul { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  /* No JS: keep every link reachable even with enlarged fonts. Sticky is
   * enabled only after real horizontal fit and header height are known. */
  .common-brand-chrome .brand-header:not([data-compact]) { position: relative; }
  .common-brand-chrome .brand-header:not([data-compact]) .brand-header__inner,
  .common-brand-chrome .brand-header:not([data-compact]) .global-nav ul { flex-wrap: wrap; }
  .common-brand-chrome .brand-header:not([data-compact]) .global-nav { flex-shrink: 1; }
  .common-brand-chrome .brand-header:not([data-compact]) .global-nav a { white-space: normal; }
}