/* Shared navigation: fixed brand tokens, independent of each page's theme and layout. */
.site-header.gh-header {
  --header-paper:#fff;
  --header-ink:#182d42;
  --header-muted:#53697d;
  --header-accent:#143d68;
  --header-accent-hover:#102f50;
  --header-soft:#f3f6f8;
  --header-rule:#dce4eb;
  --header-focus:#236c89;
  --header-error:#ad3030;
  --header-shadow:0 14px 28px #182d4214;
  position:sticky;top:0;z-index:160;
  color:var(--header-ink);background:var(--header-paper);
  border-bottom:1px solid var(--header-rule);backdrop-filter:none;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:14px;line-height:1.4;direction:ltr;text-align:left;
}
.gh-header .site-header__inner {
  position:static;display:flex;align-items:center;gap:20px;
  width:100%;max-width:1280px;height:80px;min-height:80px;
  margin:0 auto;padding:0 32px;box-sizing:border-box;
}
.gh-header .site-logo {display:flex;flex:0 0 148px;align-items:center;width:148px;min-width:0;margin:0;padding:0;gap:0}
.gh-header .site-logo img {display:block;width:148px;height:auto;max-height:40px;object-fit:contain}
.gh-header .site-logo>span {display:none}
.gh-header .nav {
  position:static;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));flex:1 1 0;align-items:center;
  min-width:0;gap:4px;margin:0;padding:0;border:0;box-shadow:none;background:var(--header-paper);direction:ltr;
}
.gh-header .nav>a {
  position:relative;display:inline-flex;align-items:center;justify-content:center;min-width:0;height:48px;min-height:48px;
  margin:0;padding:0 3px;font-size:14px;font-weight:500;line-height:1.4;
  color:var(--header-ink);white-space:normal;overflow-wrap:anywhere;text-align:center;text-decoration:none;border:0;
}
.gh-header .nav>a::after {
  content:"";position:absolute;left:calc(50% - 16px);right:auto;bottom:0;width:32px;height:2px;
  background:var(--header-accent);transform:scaleX(0);transform-origin:center;
  transition:transform .16s ease;
}
.gh-header .nav>a.active {color:var(--header-accent);font-weight:500}
.gh-header .nav>a.active::after {width:32px;transform:scaleX(1)}
.gh-header .header-cta {display:flex;flex:0 0 270px;width:270px;align-items:center;gap:12px;margin:0;direction:ltr}
.gh-header .gh-utility {display:contents;height:auto;min-height:0;border:0;background:transparent}
.gh-header .gh-utility__inner {
  display:flex;align-items:center;justify-content:flex-end;flex-wrap:nowrap;gap:4px;
  flex:0 0 126px;width:126px;min-width:126px;min-height:44px;max-width:126px;margin:0;padding:0;direction:ltr;
}
.gh-header .gh-account-button {
  display:inline-flex;align-items:center;justify-content:center;flex:0 0 44px;
  width:44px;min-height:44px;padding:0;border:0;border-radius:5px;
  color:var(--header-muted);background:transparent;font:inherit;cursor:pointer;
}
.gh-header .gh-account-button {position:relative}
.gh-header .gh-account-button[data-auth-state=authenticated] {color:var(--header-accent);background:var(--header-soft)}
.gh-header .gh-account-button[data-auth-state=authenticated]::after {content:'✓';position:absolute;right:3px;bottom:3px;display:grid;place-items:center;width:14px;height:14px;border:2px solid var(--header-paper);border-radius:50%;background:#287047;color:#fff;font-size:10px;font-weight:700;line-height:1;box-sizing:content-box}
.gh-header .gh-account-button[data-auth-state=error]::after {content:'!';position:absolute;right:4px;bottom:4px;display:grid;place-items:center;width:12px;height:12px;border-radius:50%;background:var(--header-error);color:#fff;font-size:10px;line-height:1}
.gh-header .gh-account-button svg {width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.5}
.gh-header .gh-account-button>span {position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.gh-header .gh-header-demo {
  display:inline-flex;flex:0 0 132px;align-items:center;justify-content:center;width:132px;height:44px;min-height:44px;padding:0 8px;
  font-size:14px;line-height:1.4;font-weight:500;white-space:normal;overflow-wrap:anywhere;text-align:center;border-radius:4px;
  border:1px solid var(--header-accent);color:var(--header-paper);background:var(--header-accent);
  box-shadow:none;transform:none;text-decoration:none;
}
.gh-header .nav-toggle {
  display:none;align-items:center;justify-content:center;flex-direction:column;flex:0 0 44px;
  gap:5px;width:44px;height:44px;padding:0;border:0;border-radius:5px;background:transparent;cursor:pointer;
}
.gh-header .nav-toggle span {
  width:20px;height:2px;margin:0;border-radius:0;background:var(--header-ink);
  transition:transform .16s ease,opacity .16s ease;
}
.gh-header .nav-toggle[aria-expanded="true"] span:nth-child(1) {transform:translateY(7px) rotate(45deg)}
.gh-header .nav-toggle[aria-expanded="true"] span:nth-child(2) {opacity:0}
.gh-header .nav-toggle[aria-expanded="true"] span:nth-child(3) {transform:translateY(-7px) rotate(-45deg)}
.gh-header .gh-mobile-actions {display:none}
.gh-header :is(a,button,select):focus-visible {outline:2px solid var(--header-focus);outline-offset:3px}
.gh-header :is(button,a):active {background-color:var(--header-soft)}
.gh-header .gh-header-demo:active {background:var(--header-accent-hover)}
.gh-header button:disabled {opacity:.5;cursor:not-allowed}

/* Compact language picker: fixed header footprint, two-column native-language choices. */
.gh-header .gh-language {
  position:relative;display:inline-flex;align-items:center;justify-content:center;flex:0 0 78px;
  direction:ltr;width:78px;height:44px;min-height:44px;max-width:78px;
  border:0;border-radius:5px;box-sizing:border-box;
  color:var(--header-muted);background:transparent;
}
.gh-header .gh-language__trigger {
  position:relative;display:flex;align-items:center;justify-content:center;gap:6px;
  width:78px;height:44px;min-height:44px;margin:0;padding:0 4px;border:0;border-radius:5px;
  color:inherit;background:transparent;font:inherit;cursor:pointer;isolation:isolate;
}
.gh-header .gh-language__trigger::before {
  content:"";position:absolute;inset:5px 0;z-index:-1;border:1px solid transparent;border-radius:5px;
  background:transparent;transition:background .15s ease,border-color .15s ease;
}
.gh-header .gh-language__trigger[aria-expanded="true"]::before {background:transparent;border-color:transparent}
.gh-header .gh-language__label {display:flex;align-items:center;margin:0;line-height:1;pointer-events:none}
.gh-header .gh-language__label svg {display:block;width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.5}
.gh-header .gh-language__current {min-width:22px;font-size:12px;font-weight:500;line-height:1;letter-spacing:.15px;pointer-events:none}
.gh-header .gh-language__chevron {width:10px;height:10px;fill:none;stroke:currentColor;stroke-width:1.5;pointer-events:none;transition:transform .15s ease}
.gh-header .gh-language__trigger[aria-expanded="true"] .gh-language__chevron {transform:rotate(180deg)}
.gh-header .gh-language__select {display:none!important}
.gh-header .gh-language__panel {
  position:fixed;z-index:220;width:316px;max-width:calc(100vw - 24px);box-sizing:border-box;
  padding:10px;border:1px solid #e5e9ee;border-radius:12px;
  background:var(--header-paper);color:var(--header-ink);box-shadow:0 10px 30px #182d4217;
  overflow-y:auto;overscroll-behavior:contain;direction:ltr;text-align:left;
}
.gh-header .gh-language__panel[hidden] {display:none}
.gh-header .gh-language__heading {padding:4px 10px 10px;font-size:11px;line-height:16px;font-weight:400;color:var(--header-muted)}
.gh-header .gh-language__grid {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 4px}
.gh-header .gh-language__row {display:contents}
.gh-header .gh-language__option {
  display:flex;align-items:center;justify-content:space-between;gap:6px;
  width:100%;height:44px;min-height:44px;margin:0;padding:0 10px;box-sizing:border-box;
  border:0;border-radius:5px;color:var(--header-ink);background:transparent;
  font:inherit;font-size:13px;font-weight:400;line-height:1.4;white-space:nowrap;text-align:left;cursor:pointer;
}
.gh-header .gh-language__option svg {flex:0 0 14px;width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.75;opacity:0}
.gh-header .gh-language__option[aria-selected="true"] {color:var(--header-accent);background:transparent;font-weight:600}
.gh-header .gh-language__option[aria-selected="true"] svg {opacity:1}
.gh-header .gh-language__option:focus-visible {outline-offset:-2px}
.gh-header .gh-language[aria-busy="true"] .gh-language__trigger::before {border-color:var(--header-rule)}
.gh-header .gh-language[aria-busy="true"] .gh-language__chevron {opacity:.4}
.gh-header .gh-language[aria-busy="true"] .gh-language__current {opacity:.6}
.gh-header .gh-language[data-state="success"] {color:var(--header-accent)}
.gh-header .gh-language.gh-language--error {color:var(--header-error)}
.gh-header .gh-language.gh-language--error .gh-language__trigger::before {border-color:var(--header-error)}
.gh-header .gh-language__status {
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;
}
.gh-header .gh-language__status[hidden] {display:none}
.gh-header .gh-language--error .gh-language__status {
  top:calc(100% + 8px);right:0;z-index:221;width:max-content;height:auto;max-width:220px;
  padding:7px 10px;margin:0;border:1px solid var(--header-rule);border-radius:5px;
  clip-path:none;white-space:normal;color:var(--header-error);background:var(--header-paper);
  box-shadow:var(--header-shadow);font-size:12px;line-height:1.5;
}
.gh-header .gh-language:has(.gh-language__trigger[aria-expanded="true"]) .gh-language__status {clip-path:inset(50%);width:1px;height:1px;padding:0;border:0;margin:-1px}
@media(hover:hover) {
  .gh-header .gh-language:hover,.gh-header .gh-language__trigger:hover {background:transparent}
  .gh-header .gh-language__trigger:hover::before {background:transparent}
  .gh-header .gh-language__trigger:hover {color:var(--header-accent)}
  .gh-header .gh-language__option:hover {color:var(--header-accent);background:var(--header-soft)}
}
.gh-header .gh-language__trigger:active {background:transparent}

/* CSS determines the first paint. Language changes never select a different layout. */
@media(min-width:1024px) and (max-width:1119px) {
  .gh-header .site-header__inner {padding-inline:24px;gap:12px}
}
@media(max-width:1023px) {
.gh-header .site-header__inner {height:72px;min-height:72px;padding-inline:24px;gap:16px;justify-content:space-between}
.gh-header .site-logo {flex-basis:140px;width:140px}
.gh-header .site-logo img {width:140px}
.gh-header .header-cta {flex:0 0 130px;width:130px;gap:8px}
.gh-header .gh-utility__inner {flex-basis:78px;width:78px;min-width:78px;max-width:78px}
.gh-header .gh-header-demo,.gh-header .gh-account-button {display:none}
.gh-header .nav-toggle {display:flex}
.gh-header .nav {
  display:none;position:absolute;inset-block-start:100%;inset-inline:0;
  max-height:calc(100vh - 72px);max-height:calc(100dvh - 72px);overflow-y:auto;overscroll-behavior:contain;
  flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;
  padding:8px max(24px,calc((100vw - 1232px)/2)) max(24px,env(safe-area-inset-bottom));
  border-bottom:1px solid var(--header-rule);box-shadow:var(--header-shadow);
}
.gh-header .nav.open {display:flex}
.gh-header .nav>a {
  height:auto;min-height:48px;justify-content:flex-start;padding:12px;
  border:0;border-bottom:1px solid var(--header-rule);font-size:16px;white-space:normal;overflow-wrap:anywhere;
}
.gh-header .nav>a::after {display:none}
.gh-header .nav>a.active {padding-inline:12px;color:var(--header-accent);background:var(--header-soft);border-radius:4px}
.gh-header .gh-mobile-actions {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding-top:20px}
}
.gh-header .gh-mobile-actions :is(button,a) {
  display:flex;align-items:center;justify-content:center;min-height:44px;padding:10px 12px;
  font:inherit;font-size:14px;line-height:1.5;white-space:normal;text-align:center;text-decoration:none;
  border:1px solid var(--header-rule);border-radius:4px;color:var(--header-ink);background:var(--header-paper);cursor:pointer;
}
.gh-header .gh-mobile-actions a::after {display:none}
.gh-header .gh-mobile-actions .gh-mobile-demo {color:var(--header-paper);background:var(--header-accent);border-color:var(--header-accent)}
.gh-header .gh-mobile-actions .gh-mobile-phone {grid-column:1/-1;border:0;color:var(--header-muted);font-size:14px;font-variant-numeric:tabular-nums}
@media(max-width:414px) {
  .gh-header .site-header__inner {padding-inline:16px;gap:8px}
  .gh-header .site-logo {flex-basis:128px;width:128px}
  .gh-header .site-logo img {width:128px}
  .gh-header .nav {padding-inline:20px}
  .gh-header .gh-mobile-actions {grid-template-columns:minmax(0,1fr)}
}
/* If JavaScript is unavailable, all primary links remain reachable on small screens. */
@media(max-width:1023px) and (scripting:none) {
  .gh-header .site-header__inner {height:auto;min-height:72px;padding:12px 20px;flex-wrap:wrap;gap:12px}
  .gh-header .header-cta {display:none}
  .gh-header .nav {position:static;display:flex;flex:1 0 100%;order:3;flex-wrap:wrap;justify-content:flex-start;gap:4px 20px;padding:0;box-shadow:none}
  .gh-header .nav>a {font-size:14px;min-height:40px;border:0;padding:0}
  .gh-header .gh-mobile-actions {display:none}
}
@media(hover:hover) {
  .gh-header .nav>a:hover {color:var(--header-accent)}
  .gh-header .nav>a:hover::after {width:32px;transform:scaleX(1)}
  .gh-header :is(.gh-account-button,.nav-toggle):hover {color:var(--header-accent);background:var(--header-soft)}
  .gh-header .gh-header-demo:hover,.gh-header .gh-mobile-actions .gh-mobile-demo:hover {color:var(--header-paper);background:var(--header-accent-hover);border-color:var(--header-accent-hover);box-shadow:none;transform:none}
}
@media(prefers-reduced-motion:reduce) {.gh-header *,.gh-header *::after {transition:none!important}}
.gh-header .gh-language__heading--planned{margin-top:8px;padding-top:10px;border-top:1px solid #edf0f3}
.gh-header .gh-language__option--planned{color:#8a96a3!important;background:transparent!important;cursor:not-allowed;gap:8px}
.gh-header .gh-language__option--planned small{font-size:10px;color:#aab3bd;font-weight:400}